阳极支撑型固体氧化物燃料电池电化学数值分析

摘要

According to the working principle of the anode-supported solid oxide fuel cell,the three-dimensional heat flow electrochemical model of the solid oxide fuel cell was established.The effects of fuel cell intake mode,intake rate and fuel gas composition on the temperature field,fuel efficiency and battery performance were studied.The results show that the temperature distribution is more uniform and the thermal stress is smaller when the fuel gas and air are in the same direction.Increasing the air flow rate at the cathode side will reduce the average battery temperature and the thermal stress,as well as improve the battery power density and fuel efficiency.Increasing fuel gas mole fraction will speed up the reaction rate,and boost the system temperature gradient and power density.The increase of the temperature gradient eventually leads to the augment of thermal stress.%根据阳极支撑平板型固体氧化物燃料电池(Solid Oxide Fuel Cell,SOFC)的工作原理,建立了SOFC的三维热流电化学模型,研究燃料电池进气方式、进气速率、燃料气组成对其温度场、燃料利用率以及电池性能的影响,结果表明,相比于反向进气方式,采用同向进气,电池温度分布更均匀,热应力更小;适当提高阴极侧空气进气速率会降低电池平均温度和热应力,同时也有利于提高电池功率密度和燃料利用率;增加燃料气的进气摩尔分数,反应速率、系统温度梯度和功率密度随之加大,由于温度梯度的增大最终导致热应力增加.