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Wyświetlanie 1-15 z 495
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
Wyświetlanie 1-15 z 495

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