Exergy analysis of polymer electrolyte fuel cell systems using methanol
Exergy analysis of polymer electrolyte fuel cell systems using methanol
复制标题
使用甲醇的聚合物电解质燃料电池系统火用分析
DOI：
10.1016/j.jpowsour.2003.08.029
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
K. Ota
中科院分区：
文献类型：
--
作者：
A. Ishihara;S. Mitsushima;N. Kamiya;K. Ota
对使用甲醇的典型聚合物电解质燃料电池 (PEFC) 系统进行了火用（可用能量）分析。对甲醇蒸汽重整PEFC系统进行物料平衡和热函平衡计算，得到火用流量。根据这些结果，获得了每个单元的火用损失，并讨论了焓和火用之间的差异。对于甲醇的蒸汽重整过程，该系统的火用损失经计算为178kJ/摩尔MeOH。尽管随着电池废热回收率接近1，焓效率也接近1，但由于电池80°C的工作温度较低，火用效率仍保持在0.45左右。还发现，为了获得0.5或更高的火用效率，电池电压应超过0.82V。使用火用分析直接甲醇燃料电池 (DMFC)，并与甲醇重整 PEFC 进行比较。为了获得比蒸汽重整PEFC更高的火用效率，DMFC的电池电压在600mA/cm2的电流密度下应为0.48V或更大。
An exergy (available energy) analysis has been conducted on a typical polymer electrolyte fuel cell (PEFC) system using methanol. The material balance and enthalpy balance were calculated for the PEFC system using methanol steam reforming, and the exergy flow was obtained. Based on these results, the exergy loss in each unit was obtained, and the difference between the enthalpy and exergy was discussed. The exergy loss in this system was calculated to be 178kJ/mole MeOH for the steam reforming process of methanol. Although the enthalpy efficiency approached unity as the recovery rate of the waste heat from the cell approached unity, the exergy efficiency remained around 0.45 since the cell’s operating temperature of 80°C is low. It was also found that the cell voltage should exceed 0.82V in order to obtain the exergy efficiency of 0.5 or higher. A direct methanol fuel cell (DMFC) was analyzed using the exergy and compared with the methanol reforming PEFC. In order to obtain the exergy efficiency higher than that of PEFC with steam reforming, the cell voltage of the DMFC should be 0.48V or greater at the current density of 600mA/cm2.