质子交换膜燃料电池带载吹扫实验研究

Experimental Study of Proton Exchange Membrane Fuel Cell Purge with Load

摘要:

通过实验对质子交换膜燃料电池单电池的停机吹扫过程开展研究。基于带载吹扫的方式研究带载电流、吹扫流量、单电池温度对吹扫的影响。研究结果表明：带载吹扫能有效地降低单电池吹扫时的电压，带载电流越大单电池初始电压越低，且随着吹扫时间的增加电池电压持续降低，可有效避免单电池长时间处于高电位。此外，增大吹扫气体流量、提高电池温度均可提高吹扫的速率，且两者对吹扫速率影响较明显。在实验条件下，阳极进气流量0.34 L/min，阴极进气流量1.32 L/min，带载电流密度0.04 A/cm²，能够同时满足吹扫时间较短、氢气消耗量较少和吹扫时电池电压较低的吹扫目标。

Abstract:

The purge of fuel cell during shutdown is very important for cold start. The purge of proton exchange membrane fuel cell was experimentally studied. The effect of current， flow rate， and single cell temperature on purge was studied by using the method of purge with load. The results show that the voltage of the single cell reduced effectively when purge with load. The voltage decreases continuously with an increase in the load current. With the increase of the purging time， the voltage of the single cell continues to decrease， which can effectively avoid the high potential of the single cell for a long time. In addition， increasing the purge gas flow rate and the cell temperature can increase the purge rate， both of which have obvious effects on the purge rate. Under the conditions of experiment， the anode inlet flow rate was 0.34 L/min1， the cathode inlet flow rate was 1.32 Lmin1， and the load current density was 0.04 A/cm2， which could meet the purging goal of a short purging time， less hydrogen consumption， and lower cell voltage during purging.