氢气燃料的燃料电池系统最大发电效率

摘要

从发电效率的定义出发,基于热力学基本原理,并利用最高发电效率时电池电压的特点和燃料及氧化剂气体需要加热至工作温度的要求,推导出了燃料电池最高发电效率的理论表达式.具体计算了氢气燃料的最大发电效率数值,分析了最大发电效率与工作温度、燃料利用率及水蒸气组分的关系.%Based on the fundamental definition of the electrical efficiency and the thermodynamics principle,a theoretical expression for the maximum electricity efficiency of a fuel cell system was derived.The characteristics of cell voltage operating at the maximum electrical efficiency and the energy required for heating the fuel and air were considered in deriving the maximum electricity efficiency expression.The values of the maximum electricity efficiency for hydrogen fuel at different operating temperatures were presented.The relationships between the maximum electricity efficiency and the working temperature,fuel utilization and the fuel steam content were analyzed.