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

Pyong Sik Pak, Young Duk Lee and Kook Young Ahn

Energy, 2009, vol. 34, issue 11, 1903-1909

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.

Keywords: Oxy-combustion; MCFC; Waste heat; H2O turbine; Repowering system; Economic evaluation (search for similar items in EconPapers)
Date: 2009
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Citations: View citations in EconPapers (8)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:34:y:2009:i:11:p:1903-1909

DOI: 10.1016/j.energy.2009.07.041

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