新型固体氧化物燃料电池连接件的结构设计与数值仿真

离散型连接件构成的固体氧化物燃料电池结构中存在反应气体容易产生涡流和较小压降等问题, 影响电池的输出功率. 本文基于COMSOL Multiphysics仿真平台, 建立离散型连接件的固体氧化物燃料电池的三维模型进行数值仿真模拟. 考虑其气体流量、组成、质量以及电化学反应过程, 研究离散型连接件电池阳极和阴极内反应气体的流速、流道阻力和浓度对电池工作性能的影响, 并与相同工况下的平直流道型连接件的固体氧化物燃料电池三维模型进行比较. 结果表明: 离散型连接件的固体氧化物燃料电池流道内的气体流速较大, 气体浓度下降较慢, 有较强的流道传质能力, 与平直流道型连接件的固体氧化物燃料电池相比, 离散型连接件电池的最大输出功率提升了61.27％.

Structure design and numerical simulation of a new type of interconnector for solid oxide fuel cell

The solid oxide fuel cell structure composed of discrete interconnectors has raised some technical issues such as the reaction gas easily generating eddy currents and small pressure drop, which affects the output power of the cell. In this paper, on the COMSOL Multi-physics simulation platform, a three-dimensional model of solid oxide fuel cell with discrete inetrconnector is established along with the numerical simulation. Considering the gas flow, composition, quality and the process of electrochemical reaction, the influence of the flow rate, flow channel resistance and concentration of the reaction gas in the anode and cathode of the discrete interconnector on the SOFC performance is studied. Compared with the solid oxide fuel cell consisting of the parallel channel interconnector under the same working conditions, as the research results show, the solid oxide fuel cell made up of the discrete interconnector achieves a larger gas flow rate, a slower decrease in gas concentration, and a stronger flow channel mass transfer capability. The maximum output power of the solid oxide fuel cell consisting of the discrete interconnector has been increased by 61.27％.