A mathematical model to study the performance of a proton exchange membrane fuel cell in a dead-ended anode mode
A mathematical model to study the performance of a proton exchange membrane fuel cell in a dead-ended anode mode
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DOI：
10.1016/j.apenergy.2014.05.010
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发表时间：
2014-10
期刊：
影响因子：
11.2
通讯作者：
Chih-Wei Yang;Yong-Song Chen
中科院分区：
文献类型：
--
作者：
Chih-Wei Yang;Yong-Song Chen
当质子交换膜燃料电池（PEMFC）系统以死端阳极模式运行时，氮气将逐渐从阴极渗透到阳极。阳极中氮的积累导致性能下降，这可以通过吹扫来恢复。吹扫策略取决于PEMFC的操作条件。为了研究运行条件对带死端阳极的质子交换膜燃料电池性能的影响，建立了一个数学模型来估计质子交换膜燃料电池阳极中的氮渗透和累积，特别是在变负载运行时。模型中考虑了操作电流密度对氮渗透的影响。根据实验数据对模型中的参数进行了标定。通过实验测量了不同工作电流密度下，单电池端部封闭阳极的电压变化。电流密度对吹扫频率和电压变化的影响。利用该模型进行的仿真结果与实验结果吻合较好。利用该模型研究了阳极中氢气浓度的瞬态变化。在本研究的最后，提出了一个清除策略。
When a proton exchange membrane fuel cell (PEMFC) system is operated in the dead-ended anode mode, nitrogen will gradually permeate from the cathode to the anode. The accumulation of nitrogen in the anode causes a performance drop, which can be recovered by purging. The purge strategy depends on operating conditions of the PEMFC. To investigate the effect of operating conditions on the performance of a PEMFC with a dead-ended anode, a mathematical model is developed to estimate the nitrogen crossover and accumulation in the anode of the PEMFC, especially for varying-load operations. The effect of operating current density on nitrogen crossover is coupled in the model. Parameters in the model are calibrated according to experimental data. The experiments are designed to measure the voltage variations of the single cell with dead-ended anode at different operating current densities. The effect of current density on purge frequency and voltage variation is shown. Simulation results by this calibrated model agree well with experimental data. The transient of hydrogen concentration in the anode is investigated by the model. A purge strategy is suggested at the end of this study.