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Energy Balance for a Direct Carbon Molten Carbonate Fuel Cell

[+] Author Affiliations
Ritesh Agarwal, Alan A. Kornhauser

Virginia Polytechnic Institute and State University, Blacksburg, VA

Paper No. HT-FED2004-56887, pp. 341-344; 4 pages
doi:10.1115/HT-FED2004-56887
From:
  • ASME 2004 Heat Transfer/Fluids Engineering Summer Conference
  • Volume 3
  • Charlotte, North Carolina, USA, July 11–15, 2004
  • Conference Sponsors: Heat Transfer Division and Fluids Engineering Division
  • ISBN: 0-7918-4692-X | eISBN: 0-7918-3740-8
  • Copyright © 2004 by ASME

abstract

A novel fuel cell design uses porous bed electrodes. Liquid electrolyte, with fuel and oxidizer entrained, is circulated through the electrodes. An energy balance has been done for the cell and auxiliaries. The design calls for the CO-CO2 mixture leaving the anode to be burned to supply an O2 -N2 -CO2 mixture to the cathode. Two heat exchangers are employed: an air preheater cooling the exhaust and a waste heat exchanger cooling the gases entering the cathode. Results show that CO/CO2 ratio is the most important parameter for determining performance. For other conditions ideal, plant efficiency varies from ∼90% for pure CO2 to ∼20% for pure CO. If decoupled from CO/CO2 ratio, the main effect of increasing cell temperature is to increase heat transfer rate in the air preheater. This is also the main effect of increasing excess air. Decreasing internal cell efficiency lowers power output and increases waste heat rejection.

Copyright © 2004 by ASME

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