摘要
通过对甲醇氧化重整 (POX)自热体系物料衡算、能量衡算 ,以及床层反应行为的研究 ,优化了POX过程操作条件 ,获得了理论产氢能量效率 η,分析了氢源与质子交换膜燃料电池 (PEMFC)衔接中的关键环节———合适的原料配比、反应压力、蒸发器和换热器中换热效率 ,以及适应PEMFC变载或电动汽车变速。
The effect of reaction conditions on the gross heat efficiency were studied on the basis of mass,and energy, balance as well as the kinetics of POX in the on-board hydrogen generation process, and the suitable reaction conditions were optimized when the whole system was considered as an autothermal process. In order to get η as high as possible, the mol ratios of O 2/CH 3OH ( f ) and H 2O/CH 3OH ( n ) should be adjusted carefully, and the suitable f and n were ca. 0.35 and ca. 0.8 respectively. The effect of reaction pressure on η was relatively trivial, which made it possible for POX to take place at a relatively high pressure to meet with PEMFC which usually works at 0.3 - 0.5 ?MPa. The heat exchange efficiency between the reformate and the cool reactants in the evaporator should be enhanced by increasing the heat exchange areas in order to obtain higher heat efficiency. Although fairly good heat efficiency could still be obtained when more methanol was consumed to meet with the increase of loading of PEMFC, more oxygen would have to be provided to the whole system which made the 'hot spot' temperature even worse.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2001年第12期1095-1099,共5页
CIESC Journal
基金
科技部"九五"攻关项目 ( 98-A2 7-0 1-0 3)
