摘要
保证阳极封闭式质子交换膜燃料电池性能的稳定性是其面临的主要问题,阳极流道的水累积是导致其性能不稳定的关键因素之一。根据电池中水传递机理、沿程损失等分析水累积引起电池性能不稳定的原因,从原理上评价了周期性排气法和周期性排气与脉动技术结合的方法对提高电池性能稳定性及避免阳极流道水累积等有效性,通过实验考察了两种方法对改善电池性能的效果,结果表明两种方法都可以改善电池性能的稳定性,在同样操作条件下第2种方法由于引入脉动氢,效果更好,周期性排气频率降低为原来的1/10,电池的电流密度增加了8.4%。通过计算得出,在一个公共排气周期,第2种方法氢气的排放量仅为第1种的12.3%。
It＇s a main problem to guarantee the performance stability of proton exchange membrane fuel cell in the dead-end mode. The water accumulation of the anode channel is one of the key factors affecting the performance stability of fuel cells. The reason why water accumulation affects performance instability of fuel cell is analyzed according to water transfer mechanism and linear loss. The effectiveness of the two methods ,purging cycle and combined purging cycle with pulsating technology, are evaluated on improving the performance of fuel cell and avoiding the water accumulation in the anode channel,and the effectiveness of them are investigated by experiments. The results indicate that both methods can improve the stability of performance of fuel cell,and under the same operating conditions,the second methods has a better effect as the pulsating hydrogen is introduced, which makes the frequency of purging be reduced to 1/10 of only purging used, and the current density of fuel cell increased by 8.4%. In a common purging cycle, the emission of hydrogen used in the second method is only 12.3% of that of used in the first method according to calculation results.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2014年第7期46-52,共7页
Journal of Chongqing University
基金
重庆市科委自然科学基金计划项目(CSTC
2010BB4302)
重庆市教育委员会科学技术研究项目(KJ110810)
关键词
质子交换膜燃料电池
周期性排气
脉动技术
稳定性
proton exchange membrane fuel cells （PEMFC）
purging cycle
pulsating technology
stability
