A uniform temperature field is desirable in the solid oxide fuel cell stack to avoid local hot regions that contribute to material degradation, thermal stresses, or very high current densities. Various geometric and operational design changes were simulated by numerical modeling of co-flow and counter-flow multi-cell stacks, and the effects on stack maximum temperature, stack temperature difference, and maximum cell temperature difference were characterized. The results showed that 11–17% methane fuel composition for on-cell steam reforming and a reduced reforming rate of 25–50% of the nominal rate was beneficial for a more uniform temperature field. Fuel exhaust recycling up to 30% was shown to provide lower temperature differences for reforming fuel in the co-flow stack, but counter-flow stacks with hydrogen fuel showed higher temperature differences. Cells with large aspect ratios showed a more uniform temperature response due to either the strong influence of the inlet gas temperatures or the greater thermal exchange with the furnace boundary condition. Improved lateral heat spreading with thicker interconnects was demonstrated, but greater improvements towards a uniform thermal field for the same amount of interconnect mass could be achieved using thicker heat spreader plates appropriately distributed along the stack height.
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ASME 2011 9th International Conference on Fuel Cell Science, Engineering and Technology collocated with ASME 2011 5th International Conference on Energy Sustainability
August 7–10, 2011
Washington, DC, USA
Conference Sponsors:
- Advanced Energy Systems Division
ISBN:
978-0-7918-5469-3
PROCEEDINGS PAPER
Effect of Geometry and Operating Parameters on Simulated SOFC Stack Temperature Uniformity
Brian J. Koeppel,
Brian J. Koeppel
Pacific Northwest National Laboratory, Richland, WA
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Kevin Lai,
Kevin Lai
Pacific Northwest National Laboratory, Richland, WA
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Moe A. Khaleel
Moe A. Khaleel
Pacific Northwest National Laboratory, Richland, WA
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Brian J. Koeppel
Pacific Northwest National Laboratory, Richland, WA
Kevin Lai
Pacific Northwest National Laboratory, Richland, WA
Moe A. Khaleel
Pacific Northwest National Laboratory, Richland, WA
Paper No:
FuelCell2011-54803, pp. 475-484; 10 pages
Published Online:
March 22, 2012
Citation
Koeppel, BJ, Lai, K, & Khaleel, MA. "Effect of Geometry and Operating Parameters on Simulated SOFC Stack Temperature Uniformity." Proceedings of the ASME 2011 9th International Conference on Fuel Cell Science, Engineering and Technology collocated with ASME 2011 5th International Conference on Energy Sustainability. ASME 2011 9th International Conference on Fuel Cell Science, Engineering and Technology. Washington, DC, USA. August 7–10, 2011. pp. 475-484. ASME. https://doi.org/10.1115/FuelCell2011-54803
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