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Numerical investigations to determine the optimal operating conditions for 1 kW-class flat-tubular solid oxide fuel cell stack

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  • Rashid, Kashif
  • Dong, Sang Keun
  • Mehran, Muhammad Taqi

Abstract

In this study, a detailed three-dimensional numerical model is developed which simultaneously assimilates the transport processes, the electrochemical and chemical reactions to optimize the performance of 1 kW-class flat-tubular solid oxide fuel cell stack while operating on H2 and pre-reformed methane fuels. The unique feature of this CFD (computational fluid dynamic) model is that it encompasses the electrochemical oxidation of H2 and CO as well as internal steam reforming reactions including radiation heat transfer analysis in the full stack. A CFD model validated with the experiments performed in-house is utilized to explore the optimal operating conditions by investigating the effect of pre-reforming rate, air/fuel inlet temperatures, oxidant utilizations and radiative heat transfer effect on the temperature distributions. The numerical results elucidated that temperature and the current density distributions can be regulated by adjusting the methane conversion in the pre-reformer. It is also observed that neglecting the CO electro-oxidation in the modeling can underestimate the stack performance; whereas increasing the inlet temperature increases the stack performance. The oxidant utilization analysis established that higher oxidant utilization adversely affects the stack performance due to higher cathodic activation polarization losses. Radiation heat transfer analysis demonstrates that it curtails peak temperature and minimizes temperature gradients of the stack components.

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  • Rashid, Kashif & Dong, Sang Keun & Mehran, Muhammad Taqi, 2017. "Numerical investigations to determine the optimal operating conditions for 1 kW-class flat-tubular solid oxide fuel cell stack," Energy, Elsevier, vol. 141(C), pages 673-691.
    • Handle: RePEc:eee:energy:v:141:y:2017:i:c:p:673-691
    DOI: 10.1016/j.energy.2017.09.082
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    Cited by:

    1. Liang, Bo & Yao, Yue & Guo, Jin & Yang, Huazheng & Liang, Jiajiang & Zhao, Zhijiang & Wu, Gang & Zhan, Yuedong & Zhao, Xiaobo & Tao, Tao & Yao, Yingbang & Lu, Shengguo & Ruirui, Zhao, 2022. "Propane-fuelled microtubular solid oxide fuel cell stack electrically connected by an anodic rectangular window," Applied Energy, Elsevier, vol. 309(C).
    2. Ashraf, Muhammad Adeel & Rashid, Kashif & Rahimipetroudi, Iman & Kim, Hyeon Jin & Dong, Sang Keun, 2020. "Analyzing different planar biogas-fueled SOFC stack designs and their effects on the flow uniformity," Energy, Elsevier, vol. 190(C).
    3. Lee, Dong-Young & Mehran, Muhammad Taqi & Kim, Jonghwan & Kim, Sangcho & Lee, Seung-Bok & Song, Rak-Hyun & Ko, Eun-Yong & Hong, Jong-Eun & Huh, Joo-Youl & Lim, Tak-Hyoung, 2020. "Scaling up syngas production with controllable H2/CO ratio in a highly efficient, compact, and durable solid oxide coelectrolysis cell unit-bundle," Applied Energy, Elsevier, vol. 257(C).

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