Solid oxide fuel cells (SOFC) are the most advanced energy system with the highest thermal efficiency. Current trend of research is on less than 10 kW scale, which requires compact fuel processing systems. Even if internal reforming in the stack is also a possible option, it causes significant temperature gradients and thermal stress. As an alternative, a compact heat exchange reformer (CHER) with a plate-fin co-flow or counter-flow configuration is proposed. Such a system integrates the heat management and reforming in one compact unit. This paper focuses on simulation of transient characteristics of CHER during the initial phase of start-up of small SOFC systems. Steam reforming (SR) and water-gas shift (WGS) reactions are chosen as the most appropriate reforming model. CHER is modeled as two-dimensional array of finite control volumes, and they are modeled with transient energy equations and dynamic molar balance equations. In addition, both reaction enthalpy and convection heat transfer between the catalyst-coated fins and fuel-steam mixture channels are considered. Several parametric simulations are performed as methane steam as a primary fuel mixture as a function of different operating temperature, steam-to-carbon ratio at the inlet, pressure gradient across the CHER, channel length, and flow configuration (co-flow and counter-flow).
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e-mail: jeong.ki@mavs.uta.edu
e-mail: daejongkim@uta.edu
e-mail: srikanth.honavaraprasad@mavs.uta.edu
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February 2012
This article was originally published in
Journal of Fuel Cell Science and Technology
Research Papers
Dynamic Modeling of a Compact Heat Exchange Reformer for High Temperature Fuel Cell Systems
Jeongpill Ki,
e-mail: jeong.ki@mavs.uta.edu
Jeongpill Ki
Mechanical and Aerospace Engineering
, 500 W. 1st Street, The University of Texas at Arlington, Arlington, TX 76019
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Daejong Kim,
e-mail: daejongkim@uta.edu
Daejong Kim
Mechanical and Aerospace Engineering
, 500 W. 1st Street, The University of Texas at Arlington, Arlington, TX 76019
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Srikanth Honavara-Prasad
e-mail: srikanth.honavaraprasad@mavs.uta.edu
Srikanth Honavara-Prasad
Mechanical and Aerospace Engineering
, 500 W. 1st Street, The University of Texas at Arlington, Arlington, TX 76019
Search for other works by this author on:
Jeongpill Ki
Mechanical and Aerospace Engineering
, 500 W. 1st Street, The University of Texas at Arlington, Arlington, TX 76019e-mail: jeong.ki@mavs.uta.edu
Daejong Kim
Mechanical and Aerospace Engineering
, 500 W. 1st Street, The University of Texas at Arlington, Arlington, TX 76019e-mail: daejongkim@uta.edu
Srikanth Honavara-Prasad
Mechanical and Aerospace Engineering
, 500 W. 1st Street, The University of Texas at Arlington, Arlington, TX 76019e-mail: srikanth.honavaraprasad@mavs.uta.edu
J. Fuel Cell Sci. Technol. Feb 2012, 9(1): 011013 (16 pages)
Published Online: December 22, 2011
Article history
Received:
January 13, 2011
Revised:
July 20, 2011
Online:
December 22, 2011
Published:
December 22, 2011
Citation
Ki, J., Kim, D., and Honavara-Prasad, S. (December 22, 2011). "Dynamic Modeling of a Compact Heat Exchange Reformer for High Temperature Fuel Cell Systems." ASME. J. Fuel Cell Sci. Technol. February 2012; 9(1): 011013. https://doi.org/10.1115/1.4004709
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