Exergy Analysis based on CO<sub>2</sub> Capture and Selective Exhaust Gas Recirculation in a Natural Gas Combined Cycle Power Plant

CHONG Chengtung; TANG Youning; NG Johan

doi:10.6054/j.jscnun.2023029

Journal of South China Normal University (Natural Science Edition) > 2023 > 55(3): 1-8. > DOI: 10.6054/j.jscnun.2023029

CHONG Chengtung, TANG Youning, NG Johan. Exergy Analysis based on CO₂ Capture and Selective Exhaust Gas Recirculation in a Natural Gas Combined Cycle Power Plant[J]. Journal of South China Normal University (Natural Science Edition), 2023, 55(3): 1-8. DOI: 10.6054/j.jscnun.2023029

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Exergy Analysis based on CO₂ Capture and Selective Exhaust Gas Recirculation in a Natural Gas Combined Cycle Power Plant

1.
Shanghai Jiao Tong University, Shanghai 201306, China
2.
Faculty of Engineering and Physical Sciences, University of Southampton Malaysia, Iskandar Puteri 79100, Johor, Malaysia

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Received Date: May 03, 2022
Available Online: August 25, 2023

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Abstract

Abstract

A novel integrated combined cycle with post-combustion carbon capture system is proposed to capture and recycle CO₂ through the integration of selective exhaust gas recirculation (S-EGR) for higher system operating efficiency. Based on the operating data of an actual combined cycle power plant, the study explores the impact of S-EGR integration on combined cycle and carbon capture system. Results show that: After S-EGR integration, the exergetic efficiencies of carbon capture and combined cycle are improved by 6.9% and 1.3%, respectively; The combustion chamber is the part with the largest Exergy destruction in the combined cycle, accounting for 44.8%, followed by the steam turbine, condenser and heat recovery steam generator (HRSG), the main reason for the Exergy destruction is the temperature difference; After post-combustion carbon capture system is integrated with the combined cycle, the thermal and exergetic efficiency both reach the peak when the S-EGR recycle rate (SRR) is 10%, and then gradually decrease.

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Exergy Analysis based on CO2 Capture and Selective Exhaust Gas Recirculation in a Natural Gas Combined Cycle Power Plant

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Exergy Analysis based on CO₂ Capture and Selective Exhaust Gas Recirculation in a Natural Gas Combined Cycle Power Plant