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Study on the Entropy Generation Distribution Characteristics of Molten Carbonate Fuel Cell System under Different CO 2 Enrichment Conditions

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  • Jing Bian

    (School of Energy, Power and Mechanical Engineering, National Thermal Power Engineering & Technology Research Center, Key Laboratory of Power Station Energy Transfer Conversion and System (North China Electric Power University), Ministry of Education, North China Electric Power University, Beijing 102206, China)

  • Liqiang Duan

    (School of Energy, Power and Mechanical Engineering, National Thermal Power Engineering & Technology Research Center, Key Laboratory of Power Station Energy Transfer Conversion and System (North China Electric Power University), Ministry of Education, North China Electric Power University, Beijing 102206, China)

  • Jing Lei

    (School of Energy, Power and Mechanical Engineering, National Thermal Power Engineering & Technology Research Center, Key Laboratory of Power Station Energy Transfer Conversion and System (North China Electric Power University), Ministry of Education, North China Electric Power University, Beijing 102206, China)

  • Yongping Yang

    (School of Energy, Power and Mechanical Engineering, National Thermal Power Engineering & Technology Research Center, Key Laboratory of Power Station Energy Transfer Conversion and System (North China Electric Power University), Ministry of Education, North China Electric Power University, Beijing 102206, China)

Abstract

The efficient and clean use of fuel is very important for the sustainable development of energy. In this article, a numerical study of molten carbonate fuel cell (MCFC) unit is carried out, and the source, distribution, and extent of six irreversible losses (fluid friction loss, mass transfer loss, ohmic loss, activation loss, heat transfer loss, the coupling loss between heat and mass transfer) are described and quantified. The effects of the operation temperature, current density, CO 2 concentration, and cathode CO 2 utilization rate on the exergy destruction and exergy efficiency during the power generation process are investigated. The results show that the main source of entropy generation in MCFC is the potential difference, which affects the ohmic and activation entropy generation, especially when the CO 2 concentration is very low. The second is the temperature gradient, which causes the entropy production of the heat transfer. With the rise of the CO 2 concentration at the cathode inlet, the exergy destruction reduces and the exergy efficiency increases. With the rise of the cathode CO 2 utilization rate, the exergy destruction rises and the exergy efficiency reduces. Therefore, analyzing the irreversible process transfer mechanism in MCFC can provide the theoretical basis for its thermal performance optimization and structure design.

Suggested Citation

  • Jing Bian & Liqiang Duan & Jing Lei & Yongping Yang, 2020. "Study on the Entropy Generation Distribution Characteristics of Molten Carbonate Fuel Cell System under Different CO 2 Enrichment Conditions," Energies, MDPI, vol. 13(21), pages 1-18, November.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:21:p:5778-:d:440039
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    References listed on IDEAS

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    1. Duan, Liqiang & Sun, Siyu & Yue, Long & Qu, Wanjun & Yang, Yongping, 2015. "Study on a new IGCC (Integrated Gasification Combined Cycle) system with CO2 capture by integrating MCFC (Molten Carbonate Fuel Cell)," Energy, Elsevier, vol. 87(C), pages 490-503.
    2. Sciacovelli, Adriano & Verda, Vittorio, 2009. "Entropy generation analysis in a monolithic-type solid oxide fuel cell (SOFC)," Energy, Elsevier, vol. 34(7), pages 850-865.
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    Cited by:

    1. Jing Bian & Liqiang Duan & Yongping Yang, 2023. "Simulation and Economic Investigation of CO 2 Separation from Gas Turbine Exhaust Gas by Molten Carbonate Fuel Cell with Exhaust Gas Recirculation and Selective Exhaust Gas Recirculation," Energies, MDPI, vol. 16(8), pages 1-21, April.

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