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Characteristics and economic evaluation of a CO2-capturing repowering system with oxy-fuel combustion for utilizing exhaust gas of molten carbonate fuel cell (MCFC)

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  • Pak, Pyong Sik
  • Lee, Young Duk
  • Ahn, Kook Young

Abstract

A scale of 2.4MW molten carbonate fuel cell (MCFC) was taken to construct a high-efficiency and economic power generation system without CO2 emission for utilizing its exhaust gas. A conventional steam turbine power generation system (STPS) is evaluated and the net generated power (NGP) is estimated to be only 131kW and the STPS is not economically feasible. A CO2-caputuring repowering system is proposed, where low temperature steam produced at heat recovery steam generator (HRSG) by using the MCFC exhaust gas is utilized as a main working fluid of a gas turbine, and the temperature of the steam is raised by combusting fuel in a combustor by using pure oxygen, not the air. It is estimated that NGP of the proposed system is 253kW, and CO2 reduction amount is 583t-CO2/y, compared to 302t-CO2/y for the STPS and that the proposed system becomes economically feasible if a CO2 emission credit higher than 20$/t-CO2 can be granted. It is also estimated, when its turbine inlet temperature is increased from 850°C to 1000°C, CO2-capturing is not cost-consuming but becomes to be profitable, owing to improved power generation characteristics.

Suggested Citation

  • Pak, Pyong Sik & Lee, Young Duk & Ahn, Kook Young, 2009. "Characteristics and economic evaluation of a CO2-capturing repowering system with oxy-fuel combustion for utilizing exhaust gas of molten carbonate fuel cell (MCFC)," Energy, Elsevier, vol. 34(11), pages 1903-1909.
    • Handle: RePEc:eee:energy:v:34:y:2009:i:11:p:1903-1909
    DOI: 10.1016/j.energy.2009.07.041
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    References listed on IDEAS

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    1. Zhang, Na & Lior, Noam, 2008. "Two novel oxy-fuel power cycles integrated with natural gas reforming and CO2 capture," Energy, Elsevier, vol. 33(2), pages 340-351.
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    Cited by:

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    5. Pak, Pyong Sik & Lee, Young Duk & Ahn, Kook Young, 2010. "Characteristics and economic evaluation of a power plant applying oxy-fuel combustion to increase power output and decrease CO2 emission," Energy, Elsevier, vol. 35(8), pages 3230-3238.
    6. Liu, Yinan & Deng, Shuai & Zhao, Ruikai & He, Junnan & Zhao, Li, 2017. "Energy-saving pathway exploration of CCS integrated with solar energy: A review of innovative concepts," Renewable and Sustainable Energy Reviews, Elsevier, vol. 77(C), pages 652-669.
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