瓦楞式固体氧化物燃料电池的结构优化  

Optimization of Structure for MOLB-type Solid Oxide Fuel Cell

作　　者：靳遵龙[1] 杨磊[1] 霍东方 刘杨[2] 樊晟两 JIN Zunlong;YANG Lei;HUO Dongfang;LIU Yang;FAN Shengliang(School of Mechanical and Power Engineering,Zhengzhou University,Zhengzhou 450001,China;Huaneng Henan Zhongyuan Gas Power Generation Co.,Ltd.,Zhumadian 463000,China)

机构地区：[1]郑州大学机械与动力工程学院,河南郑州450001 [2]华能河南中原燃气发电有限公司,河南驻马店463000

出　　处：《郑州大学学报（工学版）》2023年第4期35-40,53,共7页Journal of Zhengzhou University（Engineering Science）

基　　金：国家自然科学基金资助项目(21676257)。

摘　　要：建立了瓦楞式固体氧化物燃料电池(SOFC)三维模型,并基于有限元方法对其进行了模拟计算。针对多孔电极内反应物分布不均、SOFC输出性能受限这一问题,以改善多孔电极内物质的传输和提升电池的输出功率为目标,考察了肋宽和阴极厚度对瓦楞式SOFC气体摩尔分数分布、温度分布、性能曲线以及极化损失的影响。结果表明:肋宽与阴极厚度的比值λ对SOFC多孔电极内气体的质量传输,以及电池的输出性能均有着重要影响:较小的肋宽有利于反应物在多孔电极内充分扩散,可以改善气体分布的均匀性、降低电池的浓差极化、提升电池输出性能;阴极厚度的增加则会使SOFC温度升高,从而使活化极化降低,电池的性能得到优化。考虑肋宽和阴极厚度对SOFC性能的协同影响可知,采用较小的λ值,可以改善电极内气体分布的均匀性,使电池的总极化损失减小,输出性能也因此得到提升。λ从10.00减小到3.33时,电池的最大平均功率密度提升了53.68%。A typical three-dimensional model of MOLB-type SOFC was developed,and the solution was based on the finite element method.In view of the problem of uneven distribution of reactants in porous electrode and limited output performance,the effects of rib widths and cathode thicknesses on the mole fraction distribution of gas,temperature distribution,performance curve and polarization of the MOLB-type SOFC were investigated with the aim of improving the mass transfer in the porous electrode and enhancing the output power.The results showed that the ratio of the rib width to the cathode thickness λ had an important effect on the mass transfer of gas in porous electrode and the output performance of the cell.The smaller rib width was conducive to the full diffusion of the reactants in the porous electrode,which could improve the uniformity of gas distribution,reduce the concentration polarization of the cell,and improve the output performance of SOFC.As the cathode thickness increased,the temperature of SOFC increased,which reduced the activation polarization and improved the performance of SOFC.Considering the synergistic effect of rib width and cathode thickness on SOFC performance,it was found that a small value of λ could improve the uniformity of the gas distribution in the electrode,reduce the total polarization loss of SOFC,and improve the output performance of the cell.Whenλdecreased from 10.00 to 3.33,the maximum output power density of SOFC increased by 53.68%.

关 键 词：瓦楞式SOFC 肋宽 阴极厚度 性能 活化极化 

分 类 号：TM911.42[电气工程—电力电子与电力传动]