A class molten carbonate fuel cell (MCFC)/gas turbine combined compact system has been designed; the system has a 250-cell MCFC stack and a turbocharger generator (TCG) as part of its gas turbine. The 250-cell stack had trouble with a gas leakage; thus, a modified 125-cell stack was refabricated and operated in the system. Using the operation results of the system, the thermal efficiency was estimated for the system of the original design. The estimated thermal efficiency is 41.0% high heating value (HHV) (45.4% low heating value); the efficiency is 2% lower than the expected value of the original design. The difference of the thermal efficiency between the estimated and expected values of the 250-cell MCFC stack is due to the increase of the internal resistance caused by the stacking procedure. The 125-cell stack was operated for with the TCG and with an external air supply system at an operating current density of ; the maximum thermal efficiency of the system was estimated (43.0% HHV) at an operating current density of . The cell voltage degradation rate was converted to be at an operating current density of . The thermal efficiency, the stack performance, the temperature distribution of the stack, the performance of the TCG, etc., are discussed in detail.
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May 2008
This article was originally published in
Journal of Fuel Cell Science and Technology
Research Papers
Kawagoe Class MCFC/TCG Compact System: Thermal Efficiency and Endurance Test Results
Fumihiko Yoshiba
Fumihiko Yoshiba
Energy Engineering Research Laboratory,
e-mail: yoshiba@criepi.denken.or.jp
Central Research Institute of Electric Power Industry
, 2-6-1 Nagasaka, Yokosuka 240-0196, Japan
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Fumihiko Yoshiba
Energy Engineering Research Laboratory,
Central Research Institute of Electric Power Industry
, 2-6-1 Nagasaka, Yokosuka 240-0196, Japane-mail: yoshiba@criepi.denken.or.jp
J. Fuel Cell Sci. Technol. May 2008, 5(2): 021010 (16 pages)
Published Online: April 18, 2008
Article history
Received:
November 24, 2005
Revised:
June 26, 2006
Published:
April 18, 2008
Citation
Yoshiba, F. (April 18, 2008). "Kawagoe Class MCFC/TCG Compact System: Thermal Efficiency and Endurance Test Results." ASME. J. Fuel Cell Sci. Technol. May 2008; 5(2): 021010. https://doi.org/10.1115/1.2784281
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