ABSTRACT

In this study, a two-dimensional, two-phase, non-isothermal, and un-steady state unitized regenerative fuel cell model is established. The effect of various operating conditions on the variation trend of parameters and cell performance during mode switching from fuel cell to electrolytic cell mode is studied when using an elliptically shallow flow channel. Three operating parameter conditions are discussed, including inlet gas velocity, electrolytic cell voltage and water supply velocity. The effects of various operating conditions on cell performance and parameters are compared. The results show that different operating conditions have different effects on cell performance. When switching from fuel cell mode to electrolytic cell mode, changing the stoichiometric ratio of inlet gas velocity does not affect the cell performance after mode switching. The cell performance can be improved gradually with the increase in electrolytic cell voltage. Increasing the flow rate of liquid water can effectively speed up the stabilization time, however, the cell performance is slightly reduced, and it is easy to accumulate oxygen at the outlet.

摘要

在这项研究中，建立了一个二维、两相、非等温和非稳态的单元化可再生燃料电池模型。研究了使用椭圆形浅流道时，从燃料电池模式切换到电解电池模式时，各种工况对参数和电池性能变化趋势的影响。讨论了三个运行参数条件，包括入口气体速度、电解池电压和供水速度。比较了各种操作条件对电池性能和参数的影响。结果表明，不同的操作条件对电池性能有不同的影响。当从燃料电池模式切换到电解电池模式时，改变入口气体速度的化学计量比不会影响模式切换后的电池性能。随着电解槽电压的升高，电池性能会逐渐提高。增加液态水的流速可以有效加快稳定时间，但电池性能略有下降，出口处易积氧。