燃料电池气体温湿度与电堆性能分析

The Analysis of Fuel Cell Performance with the Temperature and Humidity of Input Gas

系统性能指标是实现燃料电池工程化应用的瓶颈之一,系统搭建和调试过程中,空气与燃料温湿度是影响质子交换膜燃料电池性能的重要因素,对系统控制策略和辅机搭配方案的制定产生很大影响。本文通过实验与统计相结合的研究方式,研究15 kW燃料电池电堆在增湿温度分别为60℃、70℃和80℃条件下分别进行氢空单侧增湿、双侧增湿和不增湿时的输出功率、发电效率和单电池电压一致性。其中输出功率采用测试台直接测量、发电效率通过经验公式计算、电压一致性则通过巡检记录和统计方法相结合的方式评价。结果表明70℃时各增湿方案下优于其他温度同等湿度条件下的电堆性能,有增湿条件明显优于无增湿方案电堆性能,而双侧增湿和氢空单侧增湿对电堆性能影响不大。

The increase of system performance indexes is one of the bottlenecks for the application of fuel cells. The temperature and the humidity can seriously influence the system performance, which in turn may result in different control strategies and auxiliary system collocation scheme. In this paper, the experiment and the statistical method are combined to evaluate the output power, system efficiency and the individual cell voltage uniformity under humidifying temperature of 60℃,70℃ and 80℃ with single side-(hydrogen or air) humidification and both sides-humidification. The output power can be read directly from the fuel cell evaluator. The system efficiency can be calculated according to empirical formulas. And the individual cell voltage uniformity can be analyzed by statistical method s. The result shows that with the same humidification plan, under temperature condition of 70℃, the system performance is better than which under 60℃ and 80℃;The fuel cell runs much better when the system includes a humidification process;There is no significant gap between the both sides or single side-schemes.