Skocz do pozycji: 1.

Tytuł:

Determination of the operating parameters of steam jet injectors for a main boiler’s regenerative feedwater system

Autorzy:

Adamkiewicz, Andrzej
Grzesiak, Szymon

Powiązania:

https://bibliotekanauki.pl/articles/135226.pdf

Data publikacji:

2019

Wydawca:

Akademia Morska w Szczecinie. Wydawnictwo AMSz

Tematy:

steam jet injector
steam cycle
steam turbine
propulsion plant
thermal efficiency
determination

Opis:

Due to the development of alternative propulsion systems, there is a need for LNG tanker turbine propulsion plants to regain their competitiveness. Previous research revealed effective methods to increase the thermal efficiency of the steam cycle based on quality assessment, and it was proposed that the latent heat of the main turbine exhaust steam could be recovered. Research was carried out for the steam cycle using regenerative heat exchangers fed by steam jet injectors. In this paper, an algorithm to determine the operating parameters of steam jet injectors, and the calculation results for different drive steam parameters are presented. The obtained results will be used as input parameters for further heat balance calculations of the proposed regenerative steam cycles.

Źródło:

Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2019, 60 (132); 171-176
1733-8670
2392-0378

Pojawia się w:

Zeszyty Naukowe Akademii Morskiej w Szczecinie

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Numerical estimation of losses in steam flow through LP turbine blade rows

Autorzy:

Dyskas, S.
Wróblewski, W.

Powiązania:

https://bibliotekanauki.pl/articles/1955213.pdf

Data publikacji:

2006

Wydawca:

Politechnika Gdańska

Tematy:

LP steam turbine
wet steam
condensation
losses

Opis:

The aim of this work is to estimate the losses in steam flow through an LP steam turbine rotor and the who]e stage. Two types of losses occur in steam flow, aerodynamic (profile, secondary flow, leakage) and thermodynamic (due to addition of heat caused by condensation). The presented numerical results are split into two groups. First, a comparison of three different calculation methods of steam flow is carried out. To this end, the geometry of an LP steam turbine's last rotor is chosen. The first examined method is the Streamline Curvature Method (SCM) used on the meridional plane with loss correlations, the other two being commercial and in-house CFD codes, solving the Reynolds-averaged Navier-Stokes equations for a 3D flow. The first two codes model equilibrium steam properties below the saturation line, while the latter models non-equilibrium steam properties. Finally, a comparison is made of the influence on lass prediction of various condensation models for the geometry of the penultimate stage, with the use of an in-house CFD code.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2006, 10, 2; 177-190
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

Evaluating the efficiency of low pressure part of steam turbines based on probing measurements

Autorzy:

Gardzilewicz, A.

Powiązania:

https://bibliotekanauki.pl/articles/175464.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

wet steam
steam turbines
measurements
numerical calculations

Opis:

A methodology oflow pressure part turbine efficiency evaluation based on measurements of the steam flow parameters in the interspaces between neighbouring stages is described. Specially manufactured probes have been applied carry out such measurements. The efficiencies of the stages operating in the superheated steam zone result directly from experimental values of pressures, temperatures, and flow angles. To complete the efficiency evaluation for the stages operating in the wet steam region, a relevant estimation of blading system losses has been proposed and validated. This evaluation of losses is compatible with the measurement results. Adaptation of a comparative error analysis makes it possible to show the advantages of the methodology over the thermal balance applied during performance tests. The low pressure turbine efficiency evaluation methodology has been applied to numerous steam turbine power units of 200–500 MW output.

Źródło:

Transactions of the Institute of Fluid-Flow Machinery; 2017, 135; 41-56
0079-3205

Pojawia się w:

Transactions of the Institute of Fluid-Flow Machinery

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

Protection From Steam at High Pressures: Development of a Test Device and Protocol

Autorzy:

Sati, R.
Crown, E. M.
Ackerman, M.
Gonzalez, J.
Dale, D.

Powiązania:

https://bibliotekanauki.pl/articles/90402.pdf

Data publikacji:

2008

Wydawca:

Centralny Instytut Ochrony Pracy

Tematy:

steam protection
high pressure steam
protective materials

Opis:

Extensive use of pressurized steam in the oil and gas sectors has led to incidents where workers were seriously injured. In this study a test device and procedure to measure heat transfer through fabrics during steam exposure were developed and evaluated. Several factors were considered while designing the test device to simulate work site conditions. Fabrics were exposed to steam at 2 distances (50 and 100 mm) and 2 pressures (207 and 69 kPa). Theoretical considerations included heat and mass transfer, and fabric structure and performance properties. The test device and procedure differentiated well among both fabric and exposure conditions. For all fabrics, maximum heat transfer was observed at highest steam pressure and shortest distance. Laminated and coated fabrics performed better than a fabric without such treatments.

Źródło:

International Journal of Occupational Safety and Ergonomics; 2008, 14, 1; 29-41
1080-3548

Pojawia się w:

International Journal of Occupational Safety and Ergonomics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Introduction

Autorzy:

Surma, Barbara

Powiązania:

https://bibliotekanauki.pl/articles/479052.pdf

Data publikacji:

2019

Wydawca:

Akademia Ignatianum w Krakowie

Tematy:

STEM
STEAM

Opis:

The subject of this issue of “Elementary Education in Theory and Practice” focuses on popularising the results of Polish and foreign research and programmes that develop children’s scientific competences. The authors of the articles explain what STEM/STEAM education is, and what its objective and effects are. They combine theory and practice in an effective manner, which is why the reader can get to know and evaluate its assumptions, as well as practical solutions. In the countries of the European Union, good practices that develop children’s scientific skills are promoted because the society can grow economically and culturally only if it is based on knowledge.

Źródło:

Edukacja Elementarna w Teorii i Praktyce; 2019, 14, 4(54); 56
1896-2327

Pojawia się w:

Edukacja Elementarna w Teorii i Praktyce

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 6.

Tytuł:

Wprowadzenie

Autorzy:

Surma, Barbara

Powiązania:

https://bibliotekanauki.pl/articles/479061.pdf

Data publikacji:

2019

Wydawca:

Akademia Ignatianum w Krakowie

Tematy:

STEM
STEAM

Źródło:

Edukacja Elementarna w Teorii i Praktyce; 2019, 14, 4(54); 7-8
1896-2327

Pojawia się w:

Edukacja Elementarna w Teorii i Praktyce

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Operational characteristics of selected marine turbogenerators powered by steam from auxiliary oil-fired boilers

Autorzy:

Behrendt, C.

Powiązania:

https://bibliotekanauki.pl/articles/135555.pdf

Data publikacji:

2015

Wydawca:

Akademia Morska w Szczecinie. Wydawnictwo AMSz

Tematy:

exploitation
steam turbine
marine turbogenerator
steam consumption
fuel
efficiency
boiler
auxiliary machinery
steam system

Opis:

This paper describes such quantitative characteristics and operational parameters for marine turbogenerator as: efficiency, and steam consumption per unit or hour for various loads. Characteristic numbers and operational parameters were estimated from the results of operational tests of a turbogenerator aboard a petroleum tanker.

Źródło:

Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 44 (116); 9-13
1733-8670
2392-0378

Pojawia się w:

Zeszyty Naukowe Akademii Morskiej w Szczecinie

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Determining steam condensation pressure in a power plant condenser in off-design conditions

Autorzy:

Laskowski, Rafał
Smyk, Adam
Ruciński, Adam
Szymczyk, Jacek

Powiązania:

https://bibliotekanauki.pl/articles/1954999.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

thermal power plant
steam condenser
condenser model
steam condensation
pressure
reference parameters
steam condenser effectiveness

Opis:

The paper presents formulas which can be used to determine steam condensation pressure in a power plant condenser in off-design conditions. The mathematical model provided in the paper makes it possible to calculate the performance of the condenser in terms of condensing steam pressure, cooling water temperature at the condenser outlet, and condenser effectiveness under variable load conditions as a function of three input properties: the temperature and the mass flow rate of cooling water at the condenser inlet and the mass flow rate of steam. The mathematical model takes into account values of properties occurring in reference conditions but it contains no constant coefficients which would have to be established based on data from technical specifications of a condenser or measurement data. Since there are no such constant coefficients, the model of the steam condenser proposed in the paper is universally applicable. The proposed equations were checked against warranty measurements made in the condenser and measurement data gathered during the operation of a 200 MW steam power unit. Based on the analysis, a conclusion may be drawn that the proposed means of determining pressure in a condenser in off-design conditions reflects the condenser performance with sufficient accuracy. This model can be used in optimization and diagnostic analyses of the performance of a power generation unit.

Źródło:

Archives of Thermodynamics; 2021, 42, 3; 45-62
1231-0956
2083-6023

Pojawia się w:

Archives of Thermodynamics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Wet steam flow in 1100 MW turbine

Autorzy:

Jun, Gukchol
Kolovratník, Michal
Hoznedl, Michal

Powiązania:

https://bibliotekanauki.pl/articles/1954998.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

steam turbine
wet steam
loss
non-equilibrium condensation
CFD

Opis:

The paper deals with the wet steam flow in a steam turbine operating in a nuclear power plant. Using a pneumatic and an optical probe, the static pressure, steam velocity, steam wetness and the fine water droplets diameter spectra were measured before and beyond the last turbine low-pressure stage. The results of the experiment serve to understand better the wet steam flow and map its liquid phase in this area. The wet steam data is also used to modify the condensation model used in computational fluid dynamics simulations. The condensation model, i.e. the nucleation rate and the growth rate of the droplets, is adjusted so that results of the numerical simulations are in a good agreement with the experimental results. A 3D computational fluid dynamics simulations was performed for the lowpressure part of the turbine considering non-equilibrium steam condensation. In the post-processing of the of the numerical calculation result, the thermodynamic wetness loss was evaluated and analysed. Loss analysis was performed for the turbine outputs of 600, 800, and 1100 MW, respectively.

Źródło:

Archives of Thermodynamics; 2021, 42, 3; 63-85
1231-0956
2083-6023

Pojawia się w:

Archives of Thermodynamics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

Economizer selection method with reference to its reliability at preliminary design stage of seagoing vessels

Autorzy:

Charchalis, A.
Kreft, J.

Powiązania:

https://bibliotekanauki.pl/articles/247168.pdf

Data publikacji:

2011

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

seagoing ships
economizer
steam boiler
steam capacity
reliability
operating conditions

Opis:

The economizers are used for production of steam heating on en route ships. The economizers are producing steam in a heat exchange process from the ship's main engine exhaust gas. Products of the incomplete combustion of the heavy fuel oil remaining in engines, passing the boiler, collect on the heat exchange surface of the economizer. When the incorrect assumptions are made for the boiler operation conditions, the boiler steam capacity drops and fire and burning of the incomplete combustion products can occur in the economizer. To minimize combustion product quantity that collects on the boiler surface, the allowable exhaust gas pressure drop in the boiler should be taken into consideration, as well as the results from recommended exhaust gas flow velocity that is determined by main engine service load determined in the preliminary design phase of the ship. The remaining operating conditions are made in such a way to obtain high steam capacity of the boiler. It is essential at the design stage to take into consideration the future operating parameters of the combustion-steam-water installation, since these parameters depend on the choice of boiler and determined at the design stage production of steam. On the basis of operation parameters of contemporary container ships, an attempt was made to select economizer capacity in the preliminary design stage taking into consideration operation conditions of the propulsion system-steam installations unit in aspect of economizer reliability.

Źródło:

Journal of KONES; 2011, 18, 2; 63-68
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

Thermomechanical Homogenization in Steam Explosion

Autorzy:

Pavlenkо, Anatoliy
Koshlak, Hanna
Basok, Borys
Hrabova, Tatiana

Powiązania:

https://bibliotekanauki.pl/articles/27315740.pdf

Data publikacji:

2023

Wydawca:

Politechnika Koszalińska. Wydawnictwo Uczelniane

Tematy:

steam explosion
homogenisation
boiling

Opis:

A steam explosion results from intense heat transfer when a thermolabile liquid phase comes into contact with a hot liquid. As a result of such contact, microdispersed fragmentation of a high-boiling liquid occurs. A mathematical model is proposed to describe the thermomechanical crushing process, considering the formation of a vapour layer at the interface between two phases and the force interaction concerning several simultaneously boiling particles of the dispersed phase.

Źródło:

Rocznik Ochrona Środowiska; 2023, 25; 9--15
1506-218X

Pojawia się w:

Rocznik Ochrona Środowiska

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

The Usage of Self-Regulating Steam Traps for Optimal Condensate Removal in Steam Pipelines

Autorzy:

Grzebielec, Andrzej
Szelągowski, Adam
Śmiechowicz, Mateusz
Stępień, Michał

Powiązania:

https://bibliotekanauki.pl/articles/24202371.pdf

Data publikacji:

2023

Wydawca:

Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.

Tematy:

steam pipelines
steam traps
energy efficiency
rurociągi parowe
odwadniacze
efektywność energetyczna

Opis:

In energy-intensive systems, in which energy need to be transported through compact pipelines, steam is very often used as an energy carrier. The latent heat of steam condensation, surpassing its sensible heat, presents a distinctive advantage, resulting in steam pipelines requiring diameters significantly smaller compared to those needed for equivalent thermal power transmission. Nonetheless, the insulation of steam pipelines remains imperfect, resulting in inevitable heat dissipation. Consequently, this thermal loss leads to the condensation of water within the pipelines, necessitating the implementation of steam traps. The precise selection and implementation of suitable steam traps are essential for sustaining optimal pipeline functionality while minimizing energy losses. This research endeavors to comprehensively assess the criteria governing steam trap selection, focusing on their pivotal role in facilitating efficient pipeline operation. To achieve this objective, a mathematical analysis was conducted to quantify the volume of liquid generated within the pipeline due to condensation. Subsequently, an innovative self-regulating steam trap was introduced and evaluated to elucidate its efficiency in evacuating the accumulated liquid. Remarkably, the utilization of these advanced self-regulating steam traps yielded remarkably positive outcomes, profoundly enhancing pipeline performance and obviating steam losses. Through meticulous analysis of the mathematical model and empirical validation of the novel steam trap's functionality, this study not only contributes to enhancing the theoretical understanding of steam pipeline dynamics but also offers practical insights into optimizing their operational efficiency. This research showcases the potential of self-regulating steam traps to revolutionize steam pipeline dewatering practices, ensuring sustained energy transmission with minimal wastage and reaffirming their pivotal role in modern energy systems.

Źródło:

Modern Engineering; 2023, 1; 24--32
2450-5501

Pojawia się w:

Modern Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

The influence of external cooling system on the performance of supercritical steam turbine cycles

Autorzy:

Kosman, W.

Powiązania:

https://bibliotekanauki.pl/articles/240233.pdf

Data publikacji:

2010

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

para nadkrytyczna
schładzanie
turbina parowa
wydajność
cooling
efficiency
steam turbine
supercritical steam

Opis:

The problem presented in this paper refers to the concepts applied to the design of supercritical steam turbines. The issue under the investigation is the presence of a cooling system. Cooling systems aim to protect the main components of the turbines against overheating. However the cooling flows mix with the main flow and modify the expansion line in the steam path. This affects the expansion process in the turbine and changes the performance when compared to the uncooled turbine. The analysis described here investigates the range of the influence of the cooling system on the turbine cycle. This influence is measured mainly through the change of the power generation efficiency. The paper explains the approach towards the assessment of the cooling effects and presents results of the modeling for three supercritical steam cycles.

Źródło:

Archives of Thermodynamics; 2010, 31, 3; 131-144
1231-0956
2083-6023

Pojawia się w:

Archives of Thermodynamics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Pary
Steams

Autorzy:

Litke, Benedykt Julian

Powiązania:

https://bibliotekanauki.pl/articles/136138.pdf

Data publikacji:

2018

Wydawca:

Wyższa Szkoła Techniczno-Ekonomiczna w Szczecinie

Tematy:

pary
proces wytwarzania
para przegrzana
para mokra
para wilgotna
parametry pary przegrzanej
parametry pary mokrej
wykres graniczny pary
steam
production process
superheated steam
wet steam
parameters of superheated
parameters wet steam
steam limit graph

Opis:

Wstęp i cele: W pracy opisano proces wytwarzania pary, parametry pary mokrej, parę przegrzaną, oraz wykresy graniczne pary. Celem pracy jest opis graficznego przebiegu temperatury substancji przy izobarycznym podgrzewaniu, podanie charakterystyk pary mokrej i pary przegrzanej oraz opis graficzny pary wodnej. Materiał i metody: Materiał stanowią źródła z literatury z zakresu termodynamiki. W pracy zastosowano metodę analizy teoretycznej. Wyniki: Rezultatem analizy jest opracowanie analityczne procesu wytwarzania pary, parametrów pary mokrej (wilgotnej) oraz przedstawienie graficzne wykresów granicznych pary. Wnioski: W czasie podgrzewania cieczy przy wyższym ciśnieniu, temperatura nasycenia jest wyższa. Czas parowania cieczy zmniejsza się ze wzrostem ciśnienia. Przy wyższym ciśnieniu do odparowania cieczy wymagana jest mniejsza ilość ciepła. Proces izobarycznego parowania jest również procesem izotermicznym. Wartości parametrów termodynamicznych pary mokrej zależą więc od stopnia suchości.
Introduction and aim: The work describes the steam generation process, wet steam parameters, superheated steam, and steam limit graphs. The aim of the work is to describe the graphic temperature course of the substance during isobaric heating, to provide the characteristics of wet steam and superheated steam and a graphic description of the water vapor. Material and methods: Material covers some sources based on the literature in the field of thermodynamics. The method of theoretical analysis has been shown in the paper. Results: The result of the analysis is the analytical development of the steam generation process, the parameters of the wet (damp) steam and the graphic representation of the steam boundary graphs. Conclusion: When the fluid is heated at a higher pressure, the saturation temperature is higher. The evaporation time of the fluid decreases with increasing pressure. At higher pressure, less heat is needed to evaporate the fluid. The process of isobaric evaporation is also an isothermal process. The values of thermodynamic parameters of wet steam depend on the degree of dryness.

Źródło:

Problemy Nauk Stosowanych; 2018, 9; 43-50
2300-6110

Pojawia się w:

Problemy Nauk Stosowanych

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Performance comparison of PWR/EPR and steam generator with and without economizer

Autorzy:

Laskowski, Rafał

Powiązania:

https://bibliotekanauki.pl/articles/24202380.pdf

Data publikacji:

2022

Wydawca:

Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.

Tematy:

steam generator
economizer
steam pressure
PWR
EPR
generator pary
ekonomizer
ciśnienie pary

Opis:

The article presents a model of a steam generator based on mass and energy balance equations, heat transfer coefficients, criterion relations and Peclet’s law. The presented model was applied to a steam generator without and with an economizer for a PWR/EPR nuclear power plant. Based on the calculations, the steam pressure at the outlet of the steam generator without the economizer is 74.17 bar, and for the model with the economizer it is 77.2 bar. The pressure difference for these two variants, based on the calculations, was therefore 3 bar. Higher steam pressure at the outlet of the steam generator translates into a greater enthalpy drop in the turbine and greater power generated by the steam turbine and the efficiency of the entire nuclear power plant. Based on the economic calculations carried out for 60 years of operation of a nuclear power plant with four steam generators, the profit from the use of the economizer amounted to about PLN 0.6 billion.

Źródło:

Modern Engineering; 2022, 2; 21--27
2450-5501

Pojawia się w:

Modern Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Rosyjski i kazachski węgiel energetyczny na rynku polskim
Russian and Kazakh steam coal in the Polish market

Autorzy:

Stala-Szlugaj, K.
Klim, A.

Powiązania:

https://bibliotekanauki.pl/articles/282388.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN

Tematy:

steam coal
prices
imports
Russia

Opis:

W artykule przeprowadzono analizę rynku odbiorców i dostawców węgla energetycznego do Polski z Rosji i Kazachstanu w latach 2009-2011. Porównano oferty cenowe głównych krajowych producentów węgla (Katowicki Węgiel SA, Katowicki Holding Węglowy SA i Lubelski Węgiel Bogdanka SA) oraz węgli importowanych. Wzięto pod uwagę miały oraz sortymenty grube i średnie. W latach 2009-2011 oferty cenowe importowanego surowca były niższe od ofert cenowych węgli krajowych (miały - nawet o około 5 zł/GJ, sortymenty grube i średnie - nawet o około 9 zł/GJ). Wśród importerów węgla wyróżniono kilka grup. Wyszczególniono mi?dzy innymi spółki handlowe reprezentujące producentów węgla z krajów WNP (Rosja - SUEK i KTK, Kazachstan - Shubarkol Komir), polskie spółki zajmujące się handlem międzynarodowym (np. spółki grupy Węglokoks SA) oraz dużych importerów sprowadzających rocznie powyżej 1 mln ton węgla (np. Barter SA oraz Krex Sp. z o.o. i Energo Sp. z o.o.). Omówiono różnice pomiędzy taryfami kolejowymi obowiązującymi w Polsce oraz w krajach WNP. W krajach WNP koszty transportu kolejowego składają się z taryfy kolejowej państw uczestniczących w przewozach towaru oraz z kosztów korzystania z wagonów kolejowych. Po wprowadzeniu tzw. taryfy unifikowanej (od 01.01.2013 r.) koszty przewozu węgla z Rosji lub Kazachstanu przez przejścia polsko-białoruskie mogą wynieść 58-65 USD/tonę.
This paper provides a market analysis of steam coal purchases and supplies from Russia and Kazakhstan to Poland in the years 2009–2011. The analysis compares imports (into Poland) of steam coal with offers from Poland’s main, domestic hard coal producers, e.g. Kompania Weglowa SA, Katowicki Holding Weglowy SA, and Lubelski Wegiel Bogdanka SA. The comparison takes into account the following hard coal sizes: coal fines, coarse, and middle grades. In the years 2009–2011, imported hard coal prices were lower than domestic prices (coal fines by as much as 5 PLN/GJ, and coarse and middle grades by as much as 9 PLN/GJ). Among the steam coal importers, two categories are specified. One is the commercial companies representing hard coal producers from CIS countries (from Russia – SUEK and KTK, from Kazakhstan – Shubarkol Komir). The other is the Polish companies involved in foreign trade (e.g. Weglokoks SA) and the Polish companies which independently import more than 1 Mt of hard coal (e.g. Barter Co., Krex PLC and Energo PLC). The paper describes the differences between Polish rail tariffs and CIS countries’ rail tariffs. In the CIS countries, the costs of railway transport consist of two elements – first the rail freight tariffs, and second the cost of using rail cars. After the implementation of so called unified rail tariffs from 1 January 2013, the transportation costs of coal from Russia and Kazakhstan through the Polish/ /Belarusian frontier crossings could be 58–65 USD/ton of coal.

Źródło:

Polityka Energetyczna; 2012, 15, 4; 229-240
1429-6675

Pojawia się w:

Polityka Energetyczna

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Estimation of the steam condensation flow via CFD methods

Autorzy:

Zakrzewski, W.
Karcz, M.
Kornet, S.

Powiązania:

https://bibliotekanauki.pl/articles/175353.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

condensation model
steam turbine
CFD

Opis:

The results of numerical simulations to predict the performance of different steam models have been presented. All of the considered models of steam condensation have been validated on the base of benchmark experiment employing expansion in nozzle and next on the low pressure part of the steam turbine stage. For numerical analysis three models have been finally used - the ideal steam model without condensation, equilibrium steam model and a nonequilibrium steam model. It was confirmed that only the inclusion of the nonequilibrium effects in the computations can lead to a proper prediction of the condensation phenomena in the test nozzle. However, the basic characteristics of the low-pressure turbine can be succesfully estimated using a simple ideal steam or the equilibrium condensation model.

Źródło:

Transactions of the Institute of Fluid-Flow Machinery; 2012, 124; 111-124
0079-3205

Pojawia się w:

Transactions of the Institute of Fluid-Flow Machinery

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

Numerical investigation of creep behaviour of high-temperature steam turbine compone

Autorzy:

Banaszkiewicz, M.

Powiązania:

https://bibliotekanauki.pl/articles/175375.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

creep
lifetime assessment
steam turbine

Opis:

The paper presents a model for creep basing on the so-called characteristic creep strain. It illustrates its application in computations of old steam turbines components. The presented model is a modification of the Norton model which relates the stress exponent to the creep rupture strength and current stress. Creep strain is a function of the above two quantities, i.e., rupture strength and current stress, and acharacteristic creep strain which is material constant for a given time and temperature. Computational examples regard the rotating and pressure components analysed using the finite element method.

Źródło:

Transactions of the Institute of Fluid-Flow Machinery; 2012, 124; 5-15
0079-3205

Pojawia się w:

Transactions of the Institute of Fluid-Flow Machinery

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Ca-Modified Co/SBA-15 Catalysts for Hydrogen Production through Ethanol Steam Reforming

Autorzy:

Chiou, J. Y. Z.
Liu, S. W.
Ho, K. F.
Huang, H. H.
Tang, Ch. W.
Wang, Ch. B.

Powiązania:

https://bibliotekanauki.pl/articles/411682.pdf

Data publikacji:

2014

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

cobalt catalysts
ethanol
steam reforming

Opis:

Hydrogen production through steam reforming of ethanol (SRE) over the Ca-modified Co/SBA-15 catalysts was studied herein to evaluate the catalytic activity, stability andthebehavior of coke deposition.The Ca-modified SBA-15 supports were prepared from the Ca(NO3)2•4H2O (10 wt%) which was incorporated to SBA-15 by incipient wetness impregnation (assigned as Ca/SBA-15) and direct hydrothermal (assigned as Ca-SBA-15) method. The active cobalt species from the Co(NO3)2•6H2O (10 wt%) was loaded to SiO2, SBA-15 and modified-SBA-15 supports with incipient wetness impregnation method to obtain the cobalt catalysts (named as Co/SiO2, Co/SBA-15, Co-Ca/SBA-15 and Co/Ca-SBA-15, respectively). The prepared catalysts were characterized by using X-ray diffraction (XRD), temperature programmed reduction (TPR), transmission electron microscopy (TEM) and BET.The catalytic performance of the SRE reaction was evaluated in a fixed-bed reactor.The results indicated that the Co/Ca-SBA-15 catalystwas preferential among these catalysts and the ethanol can be converted completely at 375 °C. The hydrogen yield (YH2) approached 4.76 at 500 °C and less coke deposited. Further, the long-term stabilitytest of this catalyst approached100h at 500 °C and did not deactivate.

Źródło:

International Letters of Chemistry, Physics and Astronomy; 2014, 5; 1-16
2299-3843

Pojawia się w:

International Letters of Chemistry, Physics and Astronomy

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

The influence of steam extraction parameters on unsteady rotor forces

Autorzy:

Rządkowski, R.
Gnesin, V.

Powiązania:

https://bibliotekanauki.pl/articles/1933176.pdf

Data publikacji:

2007

Wydawca:

Politechnika Gdańska

Tematy:

steam extraction
blade
unsteady forces

Opis:

Aerodynamic unsteady forces of rotor blades in a turbine stage with steam extraction were calculated and blade failure was reported. A numerical calculation of the 3D transonic flow of an ideal gas through turbomachinery blade rows moving one in relation to another is presented. An ideal gas flow through mutually moving stator and rotor blades with periodicity on the whole annulus is described with unsteady Euler conservation equations, integrated using the explicit monotonous finite-volume difference scheme of Godunov-Kolgan and a moving hybrid H-H grid. In order to find the pressure distribution of steam parameters behind the rotor blades, calculations were performed for a steady flow through the stage and the steam extraction channels using the SPARC program and the unsteady forces of the rotor blade were calculated for four steam extraction conditions. For the maximal steam extraction the 10th harmonic of the axial force and moment was found to be close to the first natural frequency of the bladed disc with one nodal diameter. Thus, steam extraction can be the cause of the blade's failure.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2007, 11, 3; 253-261
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

Computational fluid dynamics analysis of 1 MW steam turbine inlet geometries

Autorzy:

Koprowski, Arkadusz
Rzadkowski, Romuald

Powiązania:

https://bibliotekanauki.pl/articles/1845499.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

CFD analysis
steam turbine
inlet

Opis:

This paper analyses the influence of three different ring-type inlet duct geometries on the performance of a small 1 MW backpressure steam turbine. It examines the efficiency and pressure drop of seven turbine variants, including four spiral inlet geometries and three stages with a mass flow rate around 30 t/h. A one-pipe and two-pipe inlets are analysed from aerodynamical point of view, taking into account stator and rotor blades in three stages without the outlet. An outlet is added to the best variant. Also analysed is the occurrence of vortices in the inlets of the studied variants 1–7 as well as the efficiency, drop pressure, turbine power and mass flow. Finally, the best inlet for a 1 MW steam turbine is suggested.

Źródło:

Archives of Thermodynamics; 2021, 42, 1; 35-55
1231-0956
2083-6023

Pojawia się w:

Archives of Thermodynamics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Simulation of control of lowpower-output steam turbines

Autorzy:

Kryłłowicz, Władysław
Karczewski, Jacek
Szuman, Paweł

Powiązania:

https://bibliotekanauki.pl/articles/2091373.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

steam turbine
simulation
power control

Opis:

Problems related to power control of low power-output steam turbines are analyzed. These turbines are designed to operate in distributed power generation systems. Principles of automatic control involving a single control valve are presented on the basis of experience gathered with high power-output turbines. Results of simulations of power control for a low power-output turbine are discussed. It has been proven that closing of the control system and an application of a power controller (of optimally selected parameters) improves the object dynamics (shortening of the transition period). At the same time, a lack of such optimization can results in occurrence of undesirable phenomena such as: overshoot in the generator power characteristics, elongation of the response time to disturbance or overshoot of turbine control valves.

Źródło:

Archives of Thermodynamics; 2022, 43, 2; 3--16
1231-0956
2083-6023

Pojawia się w:

Archives of Thermodynamics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Analiza i synteza układu „serwo” schładzacza pary w kotle energetycznym na platformie oprogramowania MATLAB/Simulink
Analysis and synthesis of the steam attemperator network „serwo” of the power boiler by means of the MATLAB/Simulink platform

Autorzy:

Grzywa, K.

Powiązania:

https://bibliotekanauki.pl/articles/137220.pdf

Data publikacji:

2013

Wydawca:

Uczelnia Jana Wyżykowskiego

Tematy:

schładzacz pary
przegrzew pary
układ regulacji temperatury
steam attemperator
steam superheating
temperature control system

Opis:

W publikacji przedstawiono wyniki badań identyfikacyjnych schładzacza pary w procesie przegrzewu pary w kotle BP1150. Omówiono budowę i zasadę działania schładzacza pary firmy KEYSTONE jako urządzenia mechatronicznego, wskazując na problemy projektowe i eksploatacyjne. Zaproponowano metodę badań symulacyjnych jako skuteczną i szybką w procesie projektowania i uruchamiania kaskadowego układu automatycznej regulacji temperatury pary na stopniach przegrzewu w kotle energetycznym. Opracowano modele elementów UAR schładzacza pary z napędem elektrycznym, regulatorów (trójstawnego, impulsowego, PID) w celu prowadzenia badań symulacyjnych z użyciem oprogramowania MATLAB/Simulink. Przedstawiono wyniki badań symulacyjnych obwodu regulacji „serwo” w postaci graficznej, dokumentujące metodą „prób i błędów” proces dojścia do rozwiązań suboptymalnych, uzyskując minimalną liczbę włączeń siłownika przy dopuszczalnym błędzie pokrycia zadanego sygnału sinusoidalnego sygnałem wyjściowym – pozycją tłoczyska z dyszami wtryskowymi.
The results of the identification research of the steam attemperator of the power boiler BP1150 in the process of steam superheating are presented in this paper. The principle of working and construction of the steam attemperator of the KEYSTON company as a mechatronic system was discussed and there were pointed out its constructive and operative problems. The method of simulating investigations as an effective and quick procedure in the projecting and set working of the cascade network of the automatic steam temperature control in the superheating stages in the power boiler was proposed. In order to carry out the simulation investigations with using the MATLAB/Simulink software there were worked out the models of UAR elements of the steam attemperator with electric drive, controllers (three-setting, impulser, PID). The results of simulation investigations of the regulation network “serwo” were presented in the graphic form documenting the trial-and-error process of reaching the suboptimal solution in the order to obtain the minimum number of switching on of the servo-motor with permissible error of covering the assign sinusoidal signal in relation to the output signal – the position of the piston rod with injection sprayer.

Źródło:

Zeszyty Naukowe Dolnośląskiej Wyższej Szkoły Przedsiębiorczości i Techniki. Studia z Nauk Technicznych; 2013, 2; 47-62
2299-3355

Pojawia się w:

Zeszyty Naukowe Dolnośląskiej Wyższej Szkoły Przedsiębiorczości i Techniki. Studia z Nauk Technicznych

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Influence of structure of heat recovery steam generator and of gas turbogenerator power repowering a 370 MW unit on the power plant operating in cogeneration cycle
Wpływ struktury kotła odzyskowego i mocy turbozespołu gazowego nadbudowujących blok 370 MW na jego pracę - praca skojarzona bloku

Autorzy:

Bartnik, R.
Buryn, Z.
Duczkowska-Kądziel, A.

Powiązania:

https://bibliotekanauki.pl/articles/173157.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

kocioł odzyskowy
turbozespół gazowy
turbina parowa
heat recovery steam generator
gas turbogenerator
steam turbine

Opis:

W artykule zaprezentowano rezultaty termodynamicznych obliczeń doboru struktury kotła odzyskowego i mocy turbozespołu gazowego do bloku o mocy 370 MW zmodernizowanego do dwupaliwowego układu gazowo-parowego. Obliczenia przeprowadzono dla pracy skojarzonej bloku.
The paper presents results of technical calculations involving the selection of a structure of heat recovery steam generator and of gas turbogenerator power applied for adaptation of a coal-fired power unit with the rated capacity of 370 MW to dual-fuel steam-gas system. Calculations were conducted for a unit operating under cogeneration cycle.

Źródło:

Archiwum Energetyki; 2012, 42, 2; 197-210
0066-684X

Pojawia się w:

Archiwum Energetyki

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

A method of diagnosing labyrinth seals in fluid-flow machines

Autorzy:

Krzyślak, P.
Winowiecki, M.

Powiązania:

https://bibliotekanauki.pl/articles/259824.pdf

Data publikacji:

2008

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

labyrinth sealings
steam turbines
sealing diagnostics

Opis:

Steam turbines constitute fluid flow machines which are used for driving engines of power plants, merchant and naval ships. They are commonly applied in power industry to driving electric generators. One of the impotant elements which affect efficiency of steam turbines used in power industry and for ship propulsion is state of labyrinth sealings whose aim is to minimize losses associated with steam leakage within turbine casing. Until now to assess state of labyrinth sealings has been only possible after stopping the turbine and its dismantling in order to determine values of clearances in the sealings. This paper presents a method which makes it possible to assess state of labyrinth sealings without the necessity of stopping and dismantling the machine. This is the method which allows to assess on-line state of machine sealings during its operation.

Źródło:

Polish Maritime Research; 2008, 3; 38-41
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Mathematical model for digital simulation of steam turbine set dynamics and on-line turbine load distribution

Autorzy:

Badyda, K.

Powiązania:

https://bibliotekanauki.pl/articles/175201.pdf

Data publikacji:

2014

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

mathematical modeling
steam turbine
online optimization

Opis:

The general structure and purposes of the distributed control systems (DCS) are reminded in connection with the capability to use them for on-line optimization of the load distribution in large, multiunit power stations. The basic assumptions, equations and structure of a model of backpressure extraction turbine are presented. The tasks, realized using this model in collaboration with the DCS’s measuring and archive systems, are defined. The principles of using and correcting the input data for the considered tasks are described. Model calculation results and recorded measuring data are compared. The input data quality and influence of the DCS record mode on the abilities to use the model appropriately are discussed.

Źródło:

Transactions of the Institute of Fluid-Flow Machinery; 2014, 126; 65-82
0079-3205

Pojawia się w:

Transactions of the Institute of Fluid-Flow Machinery

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Performance Analysis Based on Experimental Data of Backpressure Steam Turbine for Cogeneration in Saturated Steam Applications

Autorzy:

Vescovi, Guilherme
Grazziotin, Gabriel
Souza, Tales
Guillen, Jorge
Quan, Ge

Powiązania:

https://bibliotekanauki.pl/articles/2051697.pdf

Data publikacji:

2021

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

steam turbine
cogeneration
energy efficiency
heat waste
saturated steam
turbina parowa
kogeneracja
efektywność energetyczna
ubytki ciepła

Opis:

This paper aims to validate the performance capabilities of a Pressure Reducing Turbine (PRT) with respect to initial predictions based on analytic calculations. The designed equipment was installed in a beverage facility, located in Brazil. The validation procedure consists of analyzing the data collected in several periods of PRT’s operation, accessed remotely via an online server. The analysis of empirical data identifies the behavior of two key variables: generated power and effective efficiency. However, the observed boundary conditions differed significantly from expected values, forcing the turbine to operate in off-design conditions. The turbine model was hence refined and used to predict the PRT’s performance in such conditions. Results showed satisfactory accuracy for both power and efficiency predictions.

Źródło:

Civil and Environmental Engineering Reports; 2021, 31, 2; 274-292
2080-5187
2450-8594

Pojawia się w:

Civil and Environmental Engineering Reports

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

How much a geometrical model of a honeycomb seal can be simplied in the CFD calculation

Autorzy:

Stajnke, M.
Włodarski, W.

Powiązania:

https://bibliotekanauki.pl/articles/175443.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

CFD modeling
steam turbine
seal
honeycomb

Opis:

This paper presents the influence of geometry simplification on the results obtained in the computational fluid dynamics simulation. The subject of simulation was part of the honeycomb seal located at the inlet to high pressure part of a steam turbine. There were three diferent geometrical models assumed in the calculations. First one was two-dimensional case and two others were three-dimensional, one with the radius of curvature and one without. Numerical simulations were performed for 15 sets of boundary conditions to compare flow characteristics for each geometrical case.

Źródło:

Transactions of the Institute of Fluid-Flow Machinery; 2017, 136; 55-64
0079-3205

Pojawia się w:

Transactions of the Institute of Fluid-Flow Machinery

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

Analysis of possibility of repairing welding of selected of the steam turbines

Autorzy:

Wieczorska, Agata
Bujko, Adrian

Powiązania:

https://bibliotekanauki.pl/articles/244945.pdf

Data publikacji:

2019

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

regenerative heat treatment
welding
steam turbine

Opis:

The article presents the results of the study on the possibilities of repair by welding methods of exploitation steam turbine bodies. Two hull were investigation after a lifetime of more than 200.000 hours. Repair welding study were carried out on the L17HMF cast steel body in the immediately after exploitation condition, whereas the L21HMF cast steel body underwent a revitalization after the exploitation, and then the welding repair research were performed. On the material taken from the L17HMF cast steel hull, welding repairs were made by welding the previously cut four grooves measuring 200 mm 50 mm 50 mm, which were simulations of material defected. All samples were made in areas where maximum steam temperatures were operating. Welds were tested with destructive and non-destructive methods to determine their quality and define non-compliances detected. The L21HMF cast steel was subjected to a revitalization process, which consisted the hull in subjecting heat treatment in order to obtain favourable structural changes and improve the strength properties. Non-destructive examinations and hardness tests were carried out on the remedial weld, indicating the required quality of repairing remedial weld. Comparative study is aimed at demonstrating the main welding problems during the repair welding of exploitation steam turbine hulls.

Źródło:

Journal of KONES; 2019, 26, 4; 265-271
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Analysis of fouling thermal resistance of feed-water heaters in steam power plants

Autorzy:

Butrymowicz, D.
Głuch, J.
Hajduk, T
Trela, M.
Gardzilewicz, A.

Powiązania:

https://bibliotekanauki.pl/articles/259063.pdf

Data publikacji:

2009

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

steam power unit
fouling
feedwater heaters

Opis:

In this paper a problem is discussed of thermal degradation of shell-and-tube recuperative feed-water heaters due to heat transfer surface fouling. Application (to an example steam cycle of power plant) of DIAGAR software system intended for the analysing of impact of degradation of a particular heat exchanger on whole recuperative system performance, is presented. On the basis of the systematically performed simulative calculations it was concluded that the degradation of feed-water heaters of the lowest extraction pressure results in an additional load imposed on the heaters of higher extraction pressures, moreover it was estimated that the degradation of the heaters due to presence of sediments of the thermal resistance reaching 5*10-4 m2*K/W, has resulted in the drop of turbine set efficiency by about 0.3%. Such drop depends on a given configuration of degree of degradation of particular feed-water heaters applied in a considered turbine set.

Źródło:

Polish Maritime Research; 2009, S 1; 3-8
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Influence of inlet geometry on the efficiency of 1 MW steam turbine

Autorzy:

Koprowski, Arkadusz
Gotowski, Dominik
Rzadkowski, Romuald
Szczepanik, Ryszard

Powiązania:

https://bibliotekanauki.pl/articles/950128.pdf

Data publikacji:

2019

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

turbine engine
steam turbine
turbine inlet

Opis:

The process of the design of the 1 MW steam turbine includes designing the stator and rotor blades, the steam turbine inlet and exit, the casing and the rotor. A turbine that operates at rotation speeds other than 3000 rpm requires a gearbox and generator with complex electronic software. This article analyses the efficiency of eight turbine variants, including seven inlet geometries and three stages of stator as well as an eight variant with one of the inlets, all three stages and an outlet. This article analyses the efficiency of 8 turbine variants, including four spiral inlet geometries and tree stages in a 1 MW steam turbine. In the article, inlets and 1st stator blades of various geometries were analysed to obtain maximal turbine efficiency. Changing the inlet spiral from one pipe to two pipes increased the turbine efficiency. The geometry of the blades and turbine inlets and outlet was carried out using Design Modeller. The blade mesh was prepared in TurboGrid and inlet in ANSYS Meshing.

Źródło:

Journal of KONES; 2019, 26, 4; 119-126
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Numerical calculation of the steam condensing flow

Autorzy:

Dykas, S.

Powiązania:

https://bibliotekanauki.pl/articles/1967648.pdf

Data publikacji:

2001

Wydawca:

Politechnika Gdańska

Tematy:

condensation
homogeneous
real gas
wet steam

Opis:

Considering the flow in the last stages of LP (low pressure) steam turbine the strong non-linearity of the thermal parameters of state and possibility of the two-phase flow have to be taken into account in the numerical calculation of the flow field. In this paper numerical calculations of the steam condensing flow for the turbine geometry are presented. The steam properties are described here on the basis of the IAPWS’97 formulation. The classical nucleation theory of Volmer and Frenkel was adapted for modelling of condensing flow. The droplet growth model of Gyarmathy is implemented. The calculations are based on the time dependent 3D Euler equations, which are coupled to three additional mass conservation equations for the liquid phase and are solved in conservative form.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2001, 5, 4; 519-535
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Steam turbine maintenance planning based on forecasting of life consumption processes and risk analysis

Autorzy:

Rusin, Andrzej
Tomala, Martyna

Powiązania:

https://bibliotekanauki.pl/articles/2172025.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN

Tematy:

steam turbine
risk analysis
preventive maintenance

Opis:

Flexible operation of coal-fired power plants contributes to the intensification of the life consumption processes, which is a serious problem especially in the case of units with a long in-service time. In steam turbine rotors, the crack propagation rate and material wear caused by low-cycle fatigue increase. The aim of the research is an attempt to forecast the development of these processes and to estimate the probability of critical elements damage, such as the high-pressure and intermediate-pressure rotors. In the stress state analyses, the finite element method (FEM) is used, the Monte Carlo method and the second order reliability method (SORM) is apply to calculate the probability of failure. It is proposed to use risk analysis to plan preventive maintenance of the turbine. The optimal intervals for carrying out diagnostic tests and prophylactic repairs is determined for various operating scenarios and various failure scenarios. This enables a reduction of the costs while ensuring the safety of the turbine's operation.

Źródło:

Eksploatacja i Niezawodność; 2022, 24, 3; 395--406
1507-2711

Pojawia się w:

Eksploatacja i Niezawodność

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Influence of shell shape on flow and acoustic parameters of a steam silencer

Autorzy:

Gaj, Patryk
Sobczak, Krzysztof
Kopania, Joanna
Wójciak, Kamil

Powiązania:

https://bibliotekanauki.pl/articles/1955072.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

acoustics
CFD
noise emission
steam silencer

Opis:

Steam discharge produces noise due to rapid expansion and a temperature drop of ejected steam. This is why steam silencers are used to change one-stage into multi-stage expansion, which reduces the intensity of pressure and temperature drop during this process and shifts emitted noise into higher frequencies, which are easier to dampen. This paper presents a flow-acoustic numerical model of a steam silencer. It is meant to help to obtain a precise analysis of phenomena occurring in steam silencers and improve the process of designing this type of device. The model described in this paper was based on the parameters of a real working unit manufactured in the Institute of Power Engineering – Thermal Technology Branch. Most of the steam silencers are designed based on construction guidelines that have not been changed for a long time. This restrained an increase in the acoustics efficiency of the steam silencers. An improvement of their flow and acoustic properties allows for the development of smaller, more efficient, and lighter construction. The current version of the model was used for the analysis of flow and acoustic changes which occur after modifying the lower region of a shell of the steam silencer. The proposed modification allowed for a 19% increase in mass flow rate through the silencer and noise reduction in the low-frequency range.

Źródło:

Archives of Thermodynamics; 2021, 42, 4; 141-154
1231-0956
2083-6023

Pojawia się w:

Archives of Thermodynamics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Operational characteristic of selected marine turbounits powered by steam from auxiliary oil-fired boilers

Autorzy:

Behrendt, C.
Stoyanov, R.

Powiązania:

https://bibliotekanauki.pl/articles/27315949.pdf

Data publikacji:

2018

Wydawca:

STE GROUP

Tematy:

pomocnicze morskie turbiny parowe
cecha eksploatacyjna
turbina parowa
marine auxiliary steam turbounits
exploitation characteristics
steam turbines

Opis:

This paper presents characteristic values and operational parameters of two selected marine auxiliary steam turbine units such as efficiency, and steam consumption per unit or per hour. For the purpose of the analysis, the cargo turbine pumps and turbogenerator have been selected. The characteristic values and operational parameters have been determined using the operational tests results for the turbounits installed on oil tankers at various power loads.

Źródło:

New Trends in Production Engineering; 2018, 1, 1; 495-501
2545-2843

Pojawia się w:

New Trends in Production Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Application of steam jet injector for latent heat recovery of marine steam turbine propulsion plant

Autorzy:

Grzesiak, S.

Powiązania:

https://bibliotekanauki.pl/articles/27315914.pdf

Data publikacji:

2018

Wydawca:

STE GROUP

Tematy:

thermal efficiency
propulsion plant
steam turbine
steam jet injector
sprawność cieplna
układ napędowy
turbina parowa
wtryskiwacz pary

Opis:

This paper presents the results of previously carried out analyses regarding efficiency and criteria evaluation of various propulsion plants of modern LNG (Liquid Natural Gas) carriers. The results of previous identification and quality assessment of waste heat energy sources of a CST (Conventional Steam Turbine) plant are presente. In this paper the possibility of use a steam jet injector in order to recover the latent heat is analysed. Calculations were carried out for an injector equipped with a de Laval nozzle, determining the thermodynamic state parameters of the mixture of drive steam and sucked in steam as well as the steam on the outlet of the injector for the various ejection ratios. On the basis of the results of the injector calculation, the heat balance of a simple regenerative Clausius – Rankine steam cycle (with one regenerative heater – deaerator) was carried out. The degree of regeneration (increase of the thermal efficiency) for cycle using the regenerative injector was determined. Based on results the further research directions for complex plants using a steam jets are indicated.

Źródło:

New Trends in Production Engineering; 2018, 1, 1; 235--244
2545-2843

Pojawia się w:

New Trends in Production Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

Effect of Strain Range and Hold Time on High Temperature Fatigue Life of G17CRMOV5-10 Cast Alloy Steel

Autorzy:

Polnik, Anna
Matysiak, Hubert
Czarnewicz, Sławomir
Pakieła, Zbigniew

Powiązania:

https://bibliotekanauki.pl/articles/24201176.pdf

Data publikacji:

2022

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Lotnictwa

Tematy:

fatigue
LCF
hold time
strain
steam turbine

Opis:

In this work, cast steel G17CrMoV5-10 was investigated. The material subject to investigation as part of this study is commonly used to manufacture steam turbine casings. Modern steam turbines operate under elevated temperature and complex oscillated loads. Thus, the focus of this study was to investigate material under behavior during low cycle fatigue (LCF) test performance at 500°C with and without hold time in tension. During all types of test, cyclic softening of cast steel was noticed. Increasing of total strain rate and applying hold time significantly reduce fatigue life. During hold time, due to temperature and tension the material creep what is confirmed by increasing inelastic stain accommodation.

Źródło:

Fatigue of Aircraft Structures; 2022, 14; 1--7
2081-7738
2300-7591

Pojawia się w:

Fatigue of Aircraft Structures

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Numerical analysis of the steam flow past the turbine blade stage

Autorzy:

Rogowski, K.
Pawlicki, J.

Powiązania:

https://bibliotekanauki.pl/articles/99392.pdf

Data publikacji:

2017

Wydawca:

Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych

Tematy:

computational fluid dynamics
steam turbine
turbulence model

Opis:

The steam flow past a last stage (the eleventh stage) of the high pressure part of the TK120 steam turbine was investigated using computational fluid dynamics (CFD). The simulations are performed using the unsteady compressible Navier-Stokes equations. Viscous steam flow has been analyzed using the Spalart-Allmaras turbulence model. The paper presents distributions of instantaneous flow parameters around turbine blades as well as instantaneous aerodynamic blade loads. Flow parameters such as: velocity and static pressure are presented as contour maps whereas aerodynamic loads, axial and circumferential, are given as functions of time. Theoretical power of the examined turbine stage is 4.11 MW. Based on the numerical investigations the power of the analyzed stage is evaluated to be 3.5 MW. All presented in this paper results have been performed using the ANSYS Fluent solver.

Źródło:

Journal of Machine Engineering; 2017, 17, 2; 102-110
1895-7595
2391-8071

Pojawia się w:

Journal of Machine Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Proposal of modernisation of a steam turbine stage before extraction, CFD and CSD analysis

Autorzy:

Gardzielewicz, A.
Karcz, M.
Marcinkowski, S.
Bielecki, M.
Badur, J.
Malec, A.
Banaszkiewicz, M.

Powiązania:

https://bibliotekanauki.pl/articles/1931599.pdf

Data publikacji:

2002

Wydawca:

Politechnika Gdańska

Tematy:

steam turbine stage
flow and stress optimisation

Opis:

The paper presents an idea and analysis of application of a new solution of a stage before extraction in the modernised LP part of 200MW turbines with ND exhaust. The idea of the patent is to introduce to the turbine steam path a ring directing high energy tip leakage steam from the stage to the regenerative extraction. Owing to this it is possible to cheaply achieve some energy benefits from the operation of first heat exchanger which in the modernised 200MW turbine is continuously underheated. Ring design has been checked using CFD and CSD numerical codes.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2002, 6, 4; 577-589
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Cargo ships’ heat demand - operational experiment

Autorzy:

Bocheński, Damian
Kreft, Dominik

Powiązania:

https://bibliotekanauki.pl/articles/1573801.pdf

Data publikacji:

2020

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

heating system
heat demand
steam
thermal oil

Opis:

The paper presents the results of an experiment conducted on two cargo ships – a 5300 TEU container with a steam heating system and a 7500 dwt general cargo ship with a thermal oil system. On both ships research has been carried out using specially designed measuring equipment. After gathering data about flow velocity and temperatures (steam/ cooling water/ thermal oil/ seawater/ outside air), calculations have been done, resulting in histograms. For both types of histograms (heat demand and service time), the probability density function was fitted, using the K-S statistical test. The last step was comparison of the probability distribution mean to seawater and the outside air temperatures by linear regression and the coefficient of determination. The dependencies between the mentioned temperatures and heat demand were noted.

Źródło:

Polish Maritime Research; 2020, 4; 60-66
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Czynniki wpływające na zmienność podatności transportowej węgli energetycznych
Factors influencing transportability of steam coals

Autorzy:

Wawrzynkiewicz, W.

Powiązania:

https://bibliotekanauki.pl/articles/318720.pdf

Data publikacji:

2003

Wydawca:

Polskie Towarzystwo Przeróbki Kopalin

Tematy:

podatność transportowa
węgle energetyczne
transportability
steam coals

Opis:

Jednym z ważnych parametrów charakteryzujących drobne sortymenty węgli energetycznych jest ich podatność transportowa. Cecha ta jest ważną właściwością węgla, szczególnie interesującą wytwórców energii, gdyż niedostateczna podatność transportowa partii węgla powoduje określone trudności w rozładunku, co prowadzi do przestojów i awarii ciągów transportowych. Zachowanie się drobnoziarnistych węgli energetycznych podczas przewozów, załadunków i wyładunków, składowania oraz dozowania zależy od takich czynników jak wilgoć, uziarnienie, zawartość popiołu i jego skład mineralogiczny. Do tej pory wpływ tych parametrów na wskaźnik podatności transportowej w literaturze naukowo - technicznej nie był szerzej opisany.
Transportability is an important feature characterising fine fractions of steam coal. It is of particular interest for power generators, since inadequate transportability of a batch of coal results in unloading problems, leading to outages and failures of coal handling lines. The behaviour of fine steam coal during transport, loading and unloading, storage and feeding depends on such factors as moisture content, size composition, ash content and mineralogical composition. Until now the effect of these parameters on transportability index has not been elaborated upon in technical literature.

Źródło:

Inżynieria Mineralna; 2003, R. 4, nr 1, 1; 27-37
1640-4920

Pojawia się w:

Inżynieria Mineralna

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Selected combined power systems consisted of selfignition engine and steam turbine

Autorzy:

Olszewski, W.
Dzida, M.

Powiązania:

https://bibliotekanauki.pl/articles/260028.pdf

Data publikacji:

2018

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

self-ignition engine
combined systems
steam turbine

Opis:

This paper presents optimization of selected combined diesel engine-steam turbine systems. Two systems: the system combined with waste heat one-pressure boiler only and its version containing additionally low-pressure boiler proper feeding degasifier and the system of two-pressure cycle, were taken into considerations. Their surplus values of power output and efficiency associated with utilization of waste heat contained in piston engine exhaust gas were compared to each other. For the considerations two high-power low-speed engines were taken into account. The main engines of comparable power of about 54 MW produced by Wartsila and MAN Diesel & Turbo firms, were selected.

Źródło:

Polish Maritime Research; 2018, S 1; 198-203
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Dynamic model of nuclear power plant steam turbine

Autorzy:

Kulkowski, K.
Kobylarz, A.
Grochowski, M.
Duzinkiewicz, K.

Powiązania:

https://bibliotekanauki.pl/articles/964021.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

nuclear power plant
steam turbine
modeling
control

Opis:

The paper presents the dynamic multivariable model of Nuclear Power Plant steam turbine. Nature of the processes occurring in a steam turbine causes a task of modeling it very difficult, especially when this model is intended to be used for on-line optimal process control (model based) over wide range of operating conditions caused by changing power demand. Particular property of developed model is that it enables calculations evaluated directly from the input to the output, including pressure drop at the stages. As the input, model takes opening degree of valve and steam properties: mass flow and pressure. Moreover, it allows access to many internal variables (besides input and output) describing processes within the turbine. The model is compared with the static steam turbine model and then verified by using archive data gained from researches within previous Polish Nuclear Power Programme. Presented case study concerns the WWER-440 steam turbine that was supposed to be used in ˙ Zarnowiec. Simulation carried out shows compliance of the static and dynamic models with the benchmark data, in a steady state conditions. Dynamic model also shows good behavior over the transient conditions.

Źródło:

Archives of Control Sciences; 2015, 25, 1; 65-86
1230-2384

Pojawia się w:

Archives of Control Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

O modernizacii teplovyh shem rajonnyh teplovyh stancij
Modernization of Regional Heat Power Stations

Autorzy:

Kantalinskij, V.

Powiązania:

https://bibliotekanauki.pl/articles/359363.pdf

Data publikacji:

2006

Wydawca:

Akademia Morska w Szczecinie. Wydawnictwo AMSz

Tematy:

EXPLO-SHIP 2006
gas-turbine plants
steam turbines
technological diagrams
heat utilization
steam-gas heat power stations

Opis:

The results of analytical research concerning the use of electrical generator plants in regional heat-power stations are given. Rational designs for using waste gas from turbines in water boilers and low-pressure steam boilers are suggested. The efficiency of combined steam-gas plants working in different operating regimes is shown.

Źródło:

Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2006, 10 (82); 235-244
1733-8670
2392-0378

Pojawia się w:

Zeszyty Naukowe Akademii Morskiej w Szczecinie

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Gry komputerowe w edukacji STEAM – możliwości i przeszkody
Computer Games in STEAM Education – Possibilities and Obstacles

Autorzy:

Mińkowska, Emilia

Powiązania:

https://bibliotekanauki.pl/articles/2037851.pdf

Data publikacji:

2021-11-19

Wydawca:

Akademia Ignatianum w Krakowie

Tematy:

edukacja STEAM
STEM
gry komputerowe
kompetencje przyszłości
nowe technologie
STEAM education
computer games
future skills
new technologies

Opis:

Coraz większy udział różnorodnych elementów z gier w kształceniu staje się faktem. Poprzez algorytmizację działań, zmiany w procesie prezentacji zjawisk czy ich symulacji w toku edukacji, gry komputerowe stają się jej atrakcyjnym aspektem, zwłaszcza w edukacji STEAM. Rozwój i dostępność otaczającej nas technologii sprawia, że należy podjąć szczególne działania względem coraz to młodszych jej użytkowników, w celu oswojenia ich z nią i zachęcenia do obcowania i tworzenia za jej pomocą nowych rozwiązań dla ich potrzeb. Gry, z racji ich powszechności w życiu codziennym uczniów, w służbie edukacji stają się oczywistym rozwiązaniem dla dostarczania wiedzy i umiejętności niezbędnych dla wykonywania zawodów w przyszłości. Prężnie rozwijający się rynek gamingowy sprawia, że dostępność gier komputerowych w tym celu nie zawęża się już wyłącznie do tych oznaczonych jako edukacyjne. Również gry wybierane przez uczniów w celach rozrywkowych przyczyniają się do większego zainteresowania obszarem STEAM. Celem artykułu jest wskazanie wybranych możliwości wykorzystania gier komputerowych w kształceniu STEAM oraz potencjalnych przeszkód, które mogą wystąpić na różnych etapach proponowanych działań. Do omawianych zagadnień dołączono rekomendacje czynności, które mogą doprowadzić do poprawy procesu kształcenia oraz przysłużyć się nauczycielom, rodzicom i twórcom w skuteczniejszym dobieraniu formy i treści gier.
The increasing share of various elements from games in education is becoming a fact. Through the algorithmization of activities, changes in the process of presenting phenomena or their simulation in the course of education, computer games become its attractive aspect, especially in STEAM education. The development and availability of the technology that surrounds us result in the conclusion that special actions should be taken with reference to its increasingly younger users in order to familiarize them with it and encourage them to interact with it to create new solutions for their needs. Due to their commonness in everyday life of students, games in the service of education are becoming an obvious solution for providing knowledge and skills necessary for the performance of various professions in future. Because of the dynamically developing gaming market, the availability of computer games for this purpose is no longer limited to those marked as educational. The games that students choose for entertainment purposes also contribute to a greater interest in the STEAM area. The aim of the article is to indicate selected possibilities of using computer games in STEAM education, and potential obstacles that may occur at various stages of the suggested activities. The discussed issues are accompanied by recommendations of actions that may lead to the improvement of the educational process and help teachers, parents and creators in selecting the form and content of games more effectively.

Źródło:

Edukacja Elementarna w Teorii i Praktyce; 2021, 16, 5 (63); 69-78
1896-2327

Pojawia się w:

Edukacja Elementarna w Teorii i Praktyce

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Selection of the rotor heat-up rate for supercritical parameter turbines

Autorzy:

Rusin, A.
Lipka, M.
Łukowicz, H.

Powiązania:

https://bibliotekanauki.pl/articles/240710.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

steam turbines
steel for ultra-supercritical steam unit
unsteady states
turbiny parowe
stal
jednostka ultra-nadkrytyczna
warunki niestabilne

Opis:

The paper presents the results of the numerical analyses for the steam turbine rotor, dedicated for the newly-designed 900 MW steam unit with supercritical steam parameters (650°C, 30.0 MPa). Basing on the design calculations, an optimal design solution was determined. Review of the available literature on materials for turbine rotors with supercritical steam parameters was done. Then the start-ups of the turbine were simulated. Thermal and strength states were analyzed. As a result, an optimal start-up characteristic was obtained.

Źródło:

Archives of Thermodynamics; 2013, 34, 3; 89-104
1231-0956
2083-6023

Pojawia się w:

Archives of Thermodynamics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

The process of regenerative heat treatment of the valve chamber of the steam turbine

Autorzy:

Wieczorska, Agata

Powiązania:

https://bibliotekanauki.pl/articles/243595.pdf

Data publikacji:

2019

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

regenerative heat treatment
valve chamber
steam turbine

Opis:

Steel castings are often used in the construction of valve chambers of steam turbines. Stringent requirements are set due to the continuous operation of the material at elevated temperatures, in the order of 300ºC to 600ºC. The material of the valve chamber must be resistant to fatigue-creep changes as well as corrosion. This material must be also resistant to dynamic damage which occures when the turbine is starting and stopping. Dynamic damage is induced by a short-lasting but intense accumulation of localized stresses. The castings of the valve chambers of the steam turbine are usually made from the “three-component” type CrMoV-cast steel. Mentioned castings of the valve chamber are continuously subjected to high temperatures, either constant and periodically variable stresses. Due to this, the degradation process of material of the castings is taking place. It is caused by physicochemical processes such as: creep, relaxation, thermal fatigue, corrosion, erosion and changes in material properties, e.g. displacement of the critical point of brittleness. Finally, first cracks and deformations can be observed in the material during the operation. The art presents the process of revitalization technology of the steam turbine valve chamber which was subjected to long-term operation at high temperatures. The revitalization process is aimed at improving the plastic properties of the material and, as the result, extending its service life. The research presented in the article show that impact strength of the chamber material after revitalization is very high. Also the strength properties of the valve chamber, after revitalization, are high and in line with the requirements. The study show that the revitalization of the valve chamber was carried out correctly and restored the material to plastic deformation.

Źródło:

Journal of KONES; 2019, 26, 3; 243-248
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Glycerol steam reforming over ceria-zirconia supported metallic catalysts

Autorzy:

Cichy, Marcin

Powiązania:

https://bibliotekanauki.pl/articles/2079948.pdf

Data publikacji:

2019

Wydawca:

Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej

Tematy:

glycerol
hydrogen
steam reforming
biodiesel
syn-gas

Opis:

Glycerol is a main by-product of transesterification reaction of plants oils to its methyl esters which are used as a substitute or as an additive to diesel fuel. Still growing so-called biodiesel production leads to large amounts of glycerol fraction flooding the market. One of the possible ways of its utilization is steam reforming reaction which main product is synthesis gas containing high concentration of hydrogen for which is still growing demand. In this work four metallic (Ni, Pt, Ru and Re) catalysts supported on ceria-zirconia mixed oxides have been investigated in glycerol steam reforming reaction.

Źródło:

Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2019, 74, 1; 93-108
2083-358X

Pojawia się w:

Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Thermodynamic and economic analysis of a 900 MW ultra-supercritical power unit

Autorzy:

Łukowicz, H.
Dykas, S.
Rulik, S.
Stępczyńska, K.

Powiązania:

https://bibliotekanauki.pl/articles/240644.pdf

Data publikacji:

2011

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

obieg pary
parametry apry
podwójne podgrzewanie
coal-fired power unit
double reheat
steam cycle
ultra-supercritical steam parameters

Opis:

The paper presents a thermal-economic analysis of different variants of a hard coal-fired 900 MW ultra-supercritical power unit. The aim of the study was to determine the effect of the parameters of live and reheated steam on the basic thermodynamic and economic indices of the thermal cycle. The subject of the study was the cycle configuration proposed as the "initial thermal cycle structure" during the completion of the project "Advanced Technologies for Energy Generation" with the live and reheated steam parameters of 650/670 [degrees]C. At the same time, a new concept of a thermal cycle for ultra-supercritical parameters with live and reheated steam temperature of 700/720 [degrees]C was suggested. The analysis of the ultra-supercritical unit concerned a variant with a single and double steam reheat. All solutions presented in the paper were subject to a detailed thermodynamic analysis, as well as an economic one which also included CO2 emissions charges. The conducted economic analysis made it possible to determine the maximum value of investment expenditures at which given solutions are pro.table.

Źródło:

Archives of Thermodynamics; 2011, 32, 3; 231-245
1231-0956
2083-6023

Pojawia się w:

Archives of Thermodynamics

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 50.

Tytuł:

Enhancement of the Brayton cycle efficiency by water or steam utilization

Autorzy:

Jesionek, K.
Chrzczonowski, A.
Ziółkowski, P.
Badur, J.

Powiązania:

https://bibliotekanauki.pl/articles/175275.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Brayton cycle
regeneration
Cheng cycle
thermodynamic analysis
gas steam turbine
computational flow mechanics
steam injection
water injection
interstage cooling

Opis:

In the paper, thermodynamic analysis of two modifications of the Brayton cycle into enhancement cycles with water or steam injection are discussed. The first one deals with a water injected gas turbine modified system with both interstage compressed air cooling and air heating (heat regeneration) before combustion chamber. The second one, mainly devoted to higher steam to air ratio, is connected with separate steam production in the heat recovery steam generator. Hence, steam utilization for the gas turbine propulsion in the Cheng cycle has been analysed. The analysis has been based on the computational flow mechanics (CFM) models of these advanced humidified systems, thanks to which, the influence of the main thermodynamic and design parameters have been examined.

Źródło:

Transactions of the Institute of Fluid-Flow Machinery; 2012, 124; 93-109
0079-3205

Pojawia się w:

Transactions of the Institute of Fluid-Flow Machinery

Dostawca treści:

Biblioteka Nauki

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