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Wyszukujesz frazę "power cycle" wg kryterium: Temat


Tytuł:
Imperatives of European Security at Russia’s Critical Point on its Power Cycle
Autorzy:
Doran, Charles F.
Powiązania:
https://bibliotekanauki.pl/articles/2091760.pdf
Data publikacji:
2020-06-25
Wydawca:
Uniwersytet Warszawski. Wydział Nauk Politycznych i Studiów Międzynarodowych
Tematy:
conflict
power
foreign policy role
power cycle
world order
war
security
sphere of influence
Opis:
For the third time in the history of modern statecraft, Russia is attempting to climb its cycle of power relative to that of its rivals in the central international system. Under Vladimir Putin, Russia is seeking a larger foreign policy role. It has used force in Abkhazia, Georgia, Crimea, and Eastern Ukraine. Like the other authoritarian Great Power, China, Russia is trying to create a sphere of influence around itself. Yet the European Union is able to deter an expansionist Russia. But to better safeguard security, the EU needs to enhance its defense capability, to make its capability more interoperable with that of the United States, and to coordinate its defense effort across EU members. In strategic terms, NATO is fully able to obtain Russia’s respect and to supply an adequate deterrent to potential aggression.
Źródło:
Stosunki Międzynarodowe - International Relations; 2015, 51, 2; 93-105
0209-0961
Pojawia się w:
Stosunki Międzynarodowe - International Relations
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of different organic fluids on performances of binary slag washing water power plants
Autorzy:
Li, Z.
Liu, Y.
Dong, P.
Zhang, Y.
Xiao, S.
Powiązania:
https://bibliotekanauki.pl/articles/240438.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
slag washing water
efficiency
organic fluids
binary power cycle
wydajność
płyn organiczny
podwójny cykl zasilania
Opis:
In this paper, 3 typical organic fluids were selected as working fluids for a sample slag washing water binary power plants. In this system, the working fluids obtain the thermal energy from slag washing water sources. Thus, it plays a significant role on the cycle performance to select the suitable working fluid. Energy and exergy efficiencies of 3 typical organic fluids were calculated. Dry type fluids (i.e., R227ea) showed higher energy and exergy efficiencies. Conversely, wet fluids (i.e., R143a and R290) indicated lower energy and exergy efficiencies, respectively.
Źródło:
Archives of Thermodynamics; 2017, 38, 3; 49-62
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigating the Efficiency of Combined Cycle Power Plants with the Data Envelopment Analysis Process (with an Emphasis on Air Pollution)
Autorzy:
Sanjaranipour, Noushin
Atabi, Farideh
Momeni, Mansour
Ghodousi, Jamal
Lahijanian, Akramolmolok
Powiązania:
https://bibliotekanauki.pl/articles/2055783.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
efficiency
Combined Cycle Power Plants
DEA
air pollution
Opis:
Performance management is one of the most significant strategies in promoting the efficiency of organizations and is highly sensitive. It is important to check the efficiency of combined cycle power plants because of their major contribution to power generation and air pollution. This study was conducted to evaluate the economic and environmental efficiency of Combined Cycle Power Plants (CCPPs). The inputs and outputs required to evaluate the performance of the power plants were determined according to expert opinions. Then, the 7-year statistics and information of the Qom, Neishabour, Shahid Rajaee, Yazd and Kerman power plants were collected as the desired CCPPs in Iran. The Window Data Envelopment Analysis (WDEA) method was used for evaluating the efficiency of the power plants. The 3-year window length showed that most of the power plants were efficient. Only the Rajaee, Neishabour and Yazd power plants were ineffective in some years. The mean efficiency of the power plants in the 4-year window length showed that the plants were efficient from 2008 to 2010.
Źródło:
Geomatics and Environmental Engineering; 2022, 16, 2; 111--125
1898-1135
Pojawia się w:
Geomatics and Environmental Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermodynamic analysis of a combined cycle power plant located in Jordan: A case study
Autorzy:
Bataineh, Khaled
Khaleel, Bara A.
Powiązania:
https://bibliotekanauki.pl/articles/240565.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
combined cycle power plant
energy efficiency
exergy efficiency
exergy destruction
exergy losses
Opis:
Efficiency and electrical power output of combined cycle power plants vary according to the ambient conditions. The amount of these variations greatly affects electricity production, fuel consumption, and plant incomes. Obviously, many world countries have a wide range of climatic conditions, which impact the performance of power plants. In this paper, a thermodynamic analysis of an operating power plant located in Jordan is performed with actual operating data acquired from the power plant control unit. The analysis is performed by using first and second laws of thermodynamics. Energy and exergy efficiencies of each component of the power plant system are calculated and the effect of ambient temperature on the components performance is studied. The effects of gas turbine pressure ratio, gas turbine inlet temperature, load and ambient conditions on the combined cycle efficiency, power outputs and exergy destruction are investigated. Energy and exergy efficiencies of the combined cycle power plant are found as 45.29%, and 42.73% respectively when the ambient temperature is 34°C. Furthermore, it is found that the combustion chamber has the largest exergy destruction rate among the system components. The results showed that 73% of the total exergy destruction occurs in the combustion chamber when the ambient temperature is 34°C. Moreover, the results show that the second major exergy loss is in HRSC. The results show that the energy and exergy efficiency of the combined cycle power plant decreases as the ambient temperature increases. According to the calculation results, improvement and modification suggestions are presented.
Źródło:
Archives of Thermodynamics; 2020, 41, 1; 95-123
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of parallel hot windbox repowering on 387 MW fossil fuel power plant
Autorzy:
Harutyunyan, A.
Badyda, K.
Wołowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/175190.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
combined cycle power plant
fossil boiler
hot windbox repowering
CO2 emissions
Opis:
The paper presents the concept of repowering in existing power plant. Among technologies for existing steam power plants, the hot windbox repowering is the fastest way to respond to the energy demand, improve efficiency and reduce the pollutants emissions. Thermodynamic analysis of power plant model with fossil boiler before and after hot windbox repowering, has been investigated using commercial software. The purpose of this work is to understand and analyze the effect of hot windbox repowering on 387 MW fossil fuel power plant as well as the effect of additional heat exchangers, which have been installed parallel with regeneration system to use the heat of boiler exhaust gases. In this way, after repowering the summary power of power plant in base load is 615 MW, which has been reached adding gas turbine (176.9 MW). To analyze the model, calculations were performed in 3 stages: 1) calculation and comparison of the thermodynamic parameters as well as carbon dioxide emissions of power plant model before and after repowering, 2) analysis of the optimal value of feed water mass flow through heat exchangers installed after economizer, 3) calculation of thermodynamic parameters in values 100%, 90%, 80% and 75% of fossil boiler heat loads.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2016, 131; 79-95
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The improvement of environmental characteristics of the combined cycle power plant by the implementation of the carbon capture installation
Autorzy:
Kotowicz, J.
Brzęczek, M.
Job, M.
Powiązania:
https://bibliotekanauki.pl/articles/134906.pdf
Data publikacji:
2015
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
combined cycle power plant
post-combustion technology
chemical absorption
carbon capture installation
power plant efficiency
ecological characteristics
Opis:
The paper describes a combined cycle power plant with carbon capture installation in a post-combustion technology. Carbon dioxide is separated from flue gas by using a chemical absorption method with monoethanolamine (MEA) as a sorbent. Separated carbon dioxide is compressed in order to prepare for transportation to the storage place. This paper identifies the electric efficiencies and other characteristic parameters of power plants before and after implementation of CO2 capture installation, as well as the power plant efficiency drop, and the improvement of ecological characteristics related to the implementation of this installation. The implementation of the installation described herein is associated with the efficiency loss caused by the auxiliary power for additional installations. The CO2 separation installation is powered by heat energy required for reclaiming the sorbent. This energy is taken in the form of steam extracted from the steam cycle, thus reducing the steam turbine power output, while the CO2 compression installation is powered by electric energy.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 44 (116); 19-24
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Maximisation of Combined Cycle Power Plant Efficiency
Maksymalizacja sprawności elektrowni gazowo-parowych
Autorzy:
Kotowicz, J.
Job, M.
Brzęczek, M.
Powiązania:
https://bibliotekanauki.pl/articles/397508.pdf
Data publikacji:
2015
Wydawca:
ENERGA
Tematy:
combined cycle power plant
turbine cooling
thermodynamic optimisation
elektrownia gazowo-parowa
chłodzenie turbiny
optymalizacja
Opis:
The paper presents concepts for increasing the efficiency of a modern combined cycle power plant. Improvement of gas turbine performance indicators as well as recovering heat from the air cooling the gas turbine’s flow system enable reaching gross electrical efficiencies of around 65%. Analyses for a wide range of compressor pressure ratios were performed. Operating characteristics were developed for the analysed combined cycle plant, for different types of open air cooling arrangements of the gas turbine’s expander: convective, transpiration and film.
W artykule przedstawiono koncepcje zwiększenia sprawności nowoczesnej elektrowni gazowo-parowej. Poprawa charakterystyk pracy turbiny gazowej oraz wykorzystanie ciepła powietrza chłodzącego układ przepływowy turbiny gazowej pozwalają na osiągnięcie sprawności elektrycznej brutto rzędu 65%. Analizy przeprowadzono w szerokim zakresie stopni sprężania w kompresorze. Sporządzono główne charakterystyki pracy analizowanego układu gazowo-parowego dla różnych typów chłodzenia otwartego powietrzem ekspandera turbiny gazowej: konwekcyjnego, transpiracyjnego oraz błonowego.
Źródło:
Acta Energetica; 2015, 4; 42-53
2300-3022
Pojawia się w:
Acta Energetica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exergetic diagnostics of a gas-and-steam power plant
Diagnostyka egzergetyczna elektrowni gazowo-parowej
Autorzy:
Stanek, Wojciech
Simla, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/396720.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
combined cycle power plant
exergetic analysis
mathematical model
elektrownia gazowo-parowa
diagnostyka egzergetyczna
model matematyczny
Opis:
Evaluation of thermodynamic efficiency of a power plant is usually performed using the method of so-called thermal diagnostics, based on energy balancing. Energetic analysis is however suitable only for a quantitative assessment and for comparing similar technologies. In order to properly assess the origins of energy losses in the given system, an exergetic analysis has to be applied. The paper describes the rules of exergetic diagnostics, which greatly extends the potential of classic thermal diagnostics. A calculation example of a combined cycle power plant is included. The example demonstrates the potential of exergetic diagnostics for locating exergy losses and explains the reasons for increased consumption of fuels by comparing two working conditions of the system: reference and operational.
W praktyce do oceny efektywności termodynamicznej działania elektrowni lub elektrociepłowni stosuje się narzędzia tak zwanej diagnostyki cieplnej opartej na bilansowaniu energetycznym. Analiza energetyczna nadaje się jednak wyłącznie do oceny ilościowej oraz porównywania podobnych technologii energetycznych. Dla prawidłowej oceny miejsc i przyczyn powstawania strat w systemach energetycznych konieczne jest zastosowanie analizy egzergetycznej. W artykule zaprezentowano zasady diagnostyki egzergetycznej, znacznie poszerzającej potencjał klasycznej diagnostyki cieplnej wraz z przykładem obliczeniowym dotyczącym elektrowni gazowo-parowej. Diagnostyka egzergetyczna jest techniką z zakresu zaawansowanej analizy egzegetycznej, pozwalającą na szczegółową detekcję przyczyn generowania strat w komponentach z uwzględnieniem tak zwanych przyczyn wewnątrzpochodnych i zewnątrzpochodnych. Procedury diagnostyki egzergetycznej, w połączeniu z technikami modelowania matematycznego, pozwalają na poszerzoną kontrolę eksploatacji procesów i systemów produkcyjnych. Ponadto umożliwiają one dekompozycję kosztu egzergetycznego pomiędzy składowe wynikające z wzajemnych powiązań pomiędzy komponentami systemu. Zaprezentowany przykład obliczeniowy dotyczący elektrowni gazowo-parowej prezentuje potencjał diagnostyki egzergetycznej w zakresie lokalizacji strat egzergii i wyjaśnia przyczyny zwiększonego zużycia zasobów zasilających system poprzez porównanie dwóch stanów: referencyjnego oraz dowolnego stanu eksploatacyjnego systemu.
Źródło:
Civil and Environmental Engineering Reports; 2019, 29, 1; 1-17
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermodynamic analysis of an innovative steam turbine power plant with oxy-methane combustors
Autorzy:
Kindra, Vladimir Olegovich
Osipov, Sergey Konstantinovich
Zlyvko, Olga Vladimirovna
Shcherbatov, Igor Alexandrovich
Sokolov, Vladimir Petrovich
Powiązania:
https://bibliotekanauki.pl/articles/1955067.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Combined cycle power plant
carbon capture
storage system
precombustion capture
post-combustion capture
oxy-fuel combustion
Opis:
The Rankine cycle steam turbine power plants make a base for world electricity production. The efficiency of modern steam turbine units is not higher than 43–45%, which is remarkably lower compared to the combined cycle power plants. However, an increase in steam turbine power plant efficiency could be achieved by the rise of initial cycle parameters up to ultra-supercritical values: 700–780◦C, 30–35 MPa. A prospective steam superheating technology is the oxy-fuel combustion heating in a sidemounted combustor located in the steam pipelines. This paper reviews thermal schemes of steam turbine power plants with one or two side-mounted steam superheaters. An influence of the initial steam parameters on the facility thermal efficiency was identified and primary and secondary superheater parameters were optimized. It was found that the working fluid superheating in the side-mounted oxy-methane combustors leads to an increase of thermal efficiency higher than that with the traditional boiler superheating in the initial temperature ranges of 700–780◦C and 660–780◦C by 0.6% and 1.4%, respectively.
Źródło:
Archives of Thermodynamics; 2021, 42, 4; 123-140
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermodynamic analysis of cycle arrangements of the coal-fired thermal power plants with carbon capture
Autorzy:
Kindra, Vladimir Olegovich
Milukov, Igor Alexandrovich
Shevchenko, Igor Vladimirovich
Shabalova, Sofia Igorevna
Kovalev, Dmitriy Sergeevich
Powiązania:
https://bibliotekanauki.pl/articles/1955057.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
combined cycle power plant
carbon capture
storage system
precombustion capture
post-combustion capture
oxy-fuel combustion
Opis:
The electricity production by combustion of organic fuels, especially coal, increases the atmospheric CO2 content, which contributes to global warming. The greenhouse gas emissions by the power production industry may be reduced by the application of CO2 capture and storage systems, but it remarkably decreases the thermal power plant (TPP) efficiency because of the considerable increase of the auxiliary electricity requirements. This paper describes the thermodynamic analysis of a combined cycle TPP with coal gasification and preliminary carbon dioxide capture from the syngas. Utilization of the heat produced in the fuel preparation increases the TPP net efficiency from 42.3% to 47.2%. Moreover, the analysis included the combined cycle power plant with coal gasification and the CO2 capture from the heat recovery steam generator exhaust gas, and the oxy-fuel combustion power cycle with coal gasification. The coal-fired combined cycle power plant efficiency with the preliminary CO2 capture from syngas is 0.6% higher than that of the CO2 capture after combustion and 9.9% higher than that with the oxy-fuel combustion and further CO2 capture. The specific CO2 emissions are equal to 103 g/kWh for the case of CO2 capture from syngas, 90 g/kWh for the case of CO2 capture from the exhaust gas and 9 g/kWh for the case of oxy-fuel combustion.
Źródło:
Archives of Thermodynamics; 2021, 42, 4; 103-121
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł

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