A mathematical model to study the energy efficiency of a proton exchange membrane fuel cell with a dead-ended anode
A mathematical model to study the energy efficiency of a proton exchange membrane fuel cell with a dead-ended anode
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DOI：
10.1016/j.apenergy.2016.11.128
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发表时间：
2017-02
期刊：
影响因子：
11.2
通讯作者：
Shang-Wen Tsai;Yong-Song Chen
中科院分区：
文献类型：
--
作者：
Shang-Wen Tsai;Yong-Song Chen
当质子交换膜燃料电池在死端阳极模式下操作时，氮气和水将从阴极扩散到阳极并积聚在阳极通道中。累积的氮和水导致通道中的氢耗尽并降低燃料电池的性能。这种性能下降可以通过打开阳极出口处的吹扫阀来恢复。然而，未使用的氢气被氮气和水从阳极中清除，导致能量效率降低。为了研究吹扫策略对能量效率的影响，开发了能够捕获气体成分沿着阳极通道变化的数学模型。研究了工作电流密度和吹扫方式对局部电流密度和气体成分随时间的变化规律的影响。最佳能量效率相对于清洗阀的清洗持续时间进行了讨论。
When a proton exchange membrane fuel cell is operated in a dead-ended anode mode, nitrogen and water will diffuse from the cathode to the anode and accumulate in the anode channel. Accumulated nitrogen and water cause hydrogen depletion in the channel and reduce the performance of the fuel cell. This performance drop can be recovered by opening the purge valve at the anode outlet. However, unused hydrogen is purged out of the anode with nitrogen and water, causing the decrease of energy efficiency. To study the effect of the purge strategy on energy efficiency, a mathematical model capable of capturing the variation of the gas composition along the anode channel is developed. The effects of operating current density and purge strategy on the time evolutions of local current density and gas composition are presented. The optimum energy efficiency with respect to the purge duration of the purge valve is also discussed.