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A Comprehensive Analysis Procedure for Predicting the Performance of a Molten Carbonate Fuel Cell

[+] Author Affiliations
D. H. Choi, H. S. Kim

Korea Advanced Institute of Science and Technology, Daejeon, South Korea

Paper No. FuelCell2008-65207, pp. 353-359; 7 pages
doi:10.1115/FuelCell2008-65207
From:
  • ASME 2008 6th International Conference on Fuel Cell Science, Engineering and Technology
  • ASME 2008 6th International Conference on Fuel Cell Science, Engineering and Technology
  • Denver, Colorado, USA, June 16–18, 2008
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-4318-1 | eISBN: 0-7918-3822-6
  • Copyright © 2008 by ASME

abstract

A three-dimensional numerical procedure to predict the performance of a molten carbonate fuel cell has been developed. The Navier-Stokes, energy, and species equations are solved to obtain the velocity, temperature, pressure, and concentration distributions in the cathode/ anode channel. The channel with the trapezoidal supports is approximated by an anisotropic porous medium, of which the effective permeability and conductivity are obtained by separate 3D FVM calculations. For a given average current density, the local current density, which is directly related to the rate of chemical reaction and heat generation on the reaction surface, and the cell voltage are determined to satisfy the electrochemical relations at the electrode surface. The process is iterative and the solution is assumed to have converged when the cell voltage and the local current density fall within the specified convergence limits. The unit cell characteristics, such as current-density distribution, and average current density vs. cell voltage are presented and discussed. Once the relation between the flow rate and the pressure loss in a unit cell are known, the mass flow to each cell of a MCFC stack is estimated by coupling the manifold flow and the flow within the unit cell. The stack performance is then calculated by integrating the individual cell performance using this information.

Copyright © 2008 by ASME

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