Using energy and exergy analysis to compare different coal-fired power plants

Tontu, Mehmet; Şahi̇n, Beşi̇r; Bilgili, Mehmet

doi:10.1080/15567036.2019.1696429

Cited by 19 publications

(4 citation statements)

References 30 publications

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“…Steam turbines which operate in nuclear power plants strongly differs in relation to operating medium characteristics in comparison to steam turbines from conventional power plants. While in conventional steam power plants turbine operate dominantly by using superheated steam [102], steam turbines from nuclear power plants dominantly operate by using wet steam [103].…”

Section: Operating Parameters Required For the Observed Steam Turbine Exergy Analysismentioning

confidence: 99%

The influence of various optimization algorithms on nuclear power plant steam turbine exergy efficiency and destruction

et al. 2021

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This paper presents an exergy analysis of the whole turbine, turbine cylinders and cylinder parts in four different operating regimes. Analyzed turbine operates in nuclear power plant while three of four operating regimes are obtained by using optimization algorithms – SA (Simplex Algorithm), GA (Genetic Algorithm) and IGSA (Improved Genetic-Simplex Algorithm). IGSA operating regime gives the highest developed mechanical power of the whole turbine equal to 1022.48 MW, followed by GA (1020.06 MW) and SA (1017.16 MW), while in Original operating regime whole turbine develop mechanical power equal to 996.29 MW. In addition, IGSA causes the highest increase in developed mechanical power of almost all cylinders and cylinder parts in comparison to the Original operating regime. All observed optimization algorithms increases the exergy destruction of the whole turbine in comparison to Original operating regime - the lowest increase causes IGSA, followed by GA and finally SA. The highest exergy efficiency of the whole turbine, equal to 85.92% is obtained by IGSA, followed by GA (85.89%) and SA (85.82%), while the lowest exergy efficiency is obtained in Original operating regime (85.70%). Analyzed turbine, which operates by using wet steam is low influenced by the ambient temperature change. IGSA, which shows dominant performance in exergy analysis parameters of the analyzed turbine, in certain situations is overpowered by GA. Therefore, in optimization of steam turbine performance, IGSA and GA can be recommended.

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Section: Operating Parameters Required For the Observed Steam Turbine Exergy Analysismentioning

confidence: 99%

The influence of various optimization algorithms on nuclear power plant steam turbine exergy efficiency and destruction

et al. 2021

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“… Sistemlerin kararlı koşullar altında çalıştığı düşünülmüştür;  Kritik-altı şartlarına sahip sistem için türbinlerin izentropik verimi ve kazan verimi %85 alınmıştır;  Süperkritik ve ultra-süperkritik sistemler için yüksek basınç (YB), orta basınç (OB) ve alçak basınç (AB) türbin izentropik verimleri ve kazan verimi sırasıyla %88, %91, %87 ve %90 alınmıştır [22];  Bütün sistemlerin jeneratör ve pompa verimleri sırasıyla %98 ve %80 alınmıştır;  Kazan besleme suyu ön ısıtması için besleme suyu ısıtıcılarına çekilen buharın basınç kaybı %2 alınmıştır [12];  Süperkritik ve ultra-süperkritik sistemler için besleme suyu ısıtıcılarındaki sıcaklık artışı, hem alçak basınç ve hem de yüksek basınç ısıtıcılarında eşit alınmıştır [22];  Ara kızdırma basamaklarındaki basınç düşüşü %10 alınmıştır [23];  Optimum verim şartlarını sağlamak için 1. ara kızdırma basıncı taze buhar basıncının %30'u, 2. Ara kızdırma basıncı ise 1. ara kızdırma basıncının %30'u alınmıştır [24][25][26].…”

Section: Sistemlerin Analizi (Analysis Of Systems)unclassified

“…Kaşka'nın[14] yaptığı çalışmaya paralel olarak en fazla ekserji bozunumu sırasıyla kazan, türbin ve kondenserde gözlemlenmiştir. Tontu vd [26]. farklı şartlar altında çalışan 3 santralin enerji ve ekserji analizini yapmış ve USC termik santralin enerji ve ekserji verimini sırasıyla %46 ve %40,8 olarak bulmuşlardır.…”

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Farklı yük şartlarında kömür yakıtlı termik güç santrallerinin termodinamik analizi

Çetin

Özen

2020

Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi

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 Energy and exergy efficiencies of the thermal power plant  The effects of steam parameters on the performance  The maximum exergy loss occurs in the thermal power plantIn this study, the thermodynamic analysis of the sub-critical and super-critical coal-fired power plants under various load conditions have been investigated. Figure A. Schematic diagram of the optimized coal-fired power plant Purpose: The aim of this study is to show the effect of live steam parameters on thermal and exergy efficiencies of thermal power plants under various load condition.Theory and Methods: Soma Power Plant was taken as a Base Case for this study. Steam parameters were increased from sub-critical level to super-critical level to investigate the effects of the steam parameters on the thermal and exergy efficiencies. Second reheat section, four regenerative heaters, two desuperheaters and regenerative turbine were added to optimize the power plant. Furthermore, the effects of the load condition on the plant's energy and exergy efficiencies are investigated by operating power plants under 50%, 75% and 100% load conditions. Results:It has been found that live steam parameters have a huge impact at the efficiencies under various load conditions. Conclusion:It is concluded that live steam parameters and load conditions are the most critical parameters to determine the power plants efficiencies. On the other hand, this study only includes performance analysis of the power plant. Thermoeconomic analysis of this study has to be investigated to achieve meaningful results.

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“…Numerical analyses (energy and exergy analyses) performed in this paper do not require knowledge of the steam turbine or any other steam system component's internal structure [38][39][40]. Those methods are widely used in the analyses of various steam turbines [41,42], gas turbines [43] and the entire power plants [44,45] (black box methods).…”

Section: Characteristics and Operating Process Of The Analyzed Steam mentioning

confidence: 99%

Comparison of Power Distribution, Losses and Efficiencies of a Steam Turbine with and without Extractions

Mrzljak

Šegota

Meštrić

et al. 2020

Teh. glas. (Online)

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The paper presents an analysis of two steam turbine operation regimes - regime with all steam extractions opened (base process) and regime with all steam extractions closed. Closing of all steam extractions significantly increases turbine real developed power for 5215.88 kW and increases turbine energy and exergy losses with simultaneous decrease of turbine energy and exergy efficiencies for more than 2%. First extracted steam mass flow rate has a dominant influence on turbine power losses (in comparison to turbine maximum power when all of steam extractions are closed). Cumulative power losses caused by steam mass flow rate extractions are the highest in the fourth turbine segment and equal to 1687.82 kW.

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Using energy and exergy analysis to compare different coal-fired power plants

Cited by 19 publications

References 30 publications

The influence of various optimization algorithms on nuclear power plant steam turbine exergy efficiency and destruction

The influence of various optimization algorithms on nuclear power plant steam turbine exergy efficiency and destruction

Farklı yük şartlarında kömür yakıtlı termik güç santrallerinin termodinamik analizi

Comparison of Power Distribution, Losses and Efficiencies of a Steam Turbine with and without Extractions

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