Numerical simulation of intermediate-temperature direct-internal-reforming planar solid oxide fuel cell
Numerical simulation of intermediate-temperature direct-internal-reforming planar solid oxide fuel cell
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DOI：
10.1016/j.energy.2010.03.058
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发表时间：
2011-04
期刊：
影响因子：
9
通讯作者：
H. Iwai;Y. Yamamoto;M. Saito;H. Yoshida
中科院分区：
文献类型：
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作者：
H. Iwai;Y. Yamamoto;M. Saito;H. Yoshida
开发了阳极支撑中温直接内部重整平面固体氧化物燃料电池（SOFC）的数值模型。在此模型中，假设将多孔材料插入通道中作为集电器，将体积平均法应用于 SOFC 中的流动通道。这种处理方法避免了完整的三维模拟，同时保持了求解流向和翼展方向上的流场和压力场的能力，从而减少了计算时间和成本。在该模型中，同时求解了准三维多组分气体流场、温度场和电势/电流场。考虑了使用甲烷的蒸汽重整反应、水煤气变换反应以及氢气和一氧化碳的电化学反应。研究发现，吸热蒸汽重整反应导致入口附近的局部温度降低，并限制了其中的电化学反应速率。计算结果表明，可以通过调整预重整速率来控制局部温度和电流密度分布。研究还发现，侧壁的少量热损失会导致翼展方向的流场和热场显着不均匀。
A numerical model for an anode-supported intermediate-temperature direct-internal-reforming planar solid oxide fuel cell (SOFC) was developed. In this model, the volume-averaging method is applied to the flow passages in the SOFC by assuming that a porous material is inserted in the passages as a current collector. This treatment reduces the computational time and cost by avoiding a full three-dimensional simulation while maintaining the ability to solve the flow and pressure fields in the streamwise and spanwise directions. In this model, quasi-three-dimensional multicomponent gas flow fields, the temperature field, and the electric potential/current fields were simultaneously solved. The steam-reforming reaction using methane, the water-gas shift reaction, and the electrochemical reactions of hydrogen and carbon monoxide were taken into account. It was found that the endothermic steam-reforming reaction led to a reduction in the local temperature near the inlet and limited the electrochemical reaction rates therein. Computational results indicated that the local temperature and current density distributions can be controlled by tuning the pre-reforming rate. It was also found that a small amount of heat loss from the sidewall can cause significant nonuniformity in the flow and thermal fields in the spanwise direction.