基于催化燃烧辅助供热的燃料电池低温启动过程研究

提出了一种解决燃料电池系统低温启动的策略,将氢气和空气预混合气体在燃料电池外部进行催化燃烧,然后将燃烧后的尾气通入燃料电池阴极流场和水流场以加热燃料电池系统.基于此低温启动策略,搭建了低温启动试验平台,研究了反应物混合气流量、氢气体积分数等参数对燃料电池低温启动过程的影响.试验结果表明:增大反应物混合气流量或增加氢气体积分数均能缩短低温启动时间;当流量为3L.min-1,氢气体积分数为5%时,电池内部温度在540s内上升到冰点以上温度,可以初步满足低温启动的要求.

Research on fuel cell cold start process by catalytic combustion auxiliary heating

The purpose of this study is to find the ultimate strategy to solve the cold start problem when fuel cell vehicles or fuel cell backup power stations in the low-temperature environment for long-term after its shutdown, this paper uses hydrogen catalytic combustion auxiliary heating cold start strategy, which puts hydrogen and air in the external catalytic reactor for catalytic combustion, and then puts the hot mixed gas into a fuel cell cathode flow field and water flow field. Subsequently, a auxiliary PEMFC strategy cold start test platform has been established based on catalytic combustion. Finally, the airspeed, hydrogen concentration and other conditions affect have been researched. Finding that increasing the hydrogen concentration and airspeed of the reaction mixture can shorten fuel cell start time. When the space velocity is 3L/min, hydrogen volume concentration is 4%, the fuel cell internal temperature can rise to zero degrees centigrade from minus ten degrees centigrade within 600 seconds.