基于催化燃烧辅助供热的燃料电池低温启动过程研究

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

摘要:

针对燃料电池汽车或基站式燃料电池备用电源在低温环境中长期停机后所面临的冷启动问题，本论文采用了氢气/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的低温启动策略。基于此低温辅助启动策略，搭建了低温启动实验平台，通过实验研究了反应物混合气流量、氢气浓度等条件对燃料电池低温启动过程的影响。实验结果表明：增大反应物混合气流量或增加氢气浓度均能缩短燃料电池低温启动时间。当流量为3L/min，氢气体积浓度达到4%时，燃料电池内部温度在600秒内上升到冰点温度以上。

Abstract:

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.