燃料电池-真空热离子混合系统的性能特性和优化分析

基于固体氧化物燃料电池（SOFC）和真空热离子发电器（VTIG）的粒子流及电流模型,建立考虑多种不可逆性的一类不可逆SOFC-VTIG混合功率系统的一般循环模型.通过该混合模型得到了混合功率系统的效率与输出功率表达式,应用数值模拟获得混合功率系统的效率和功率随系统一些重要参数变化的关系曲线,从而揭示了混合功率系统的性能特征,确定了系统一些重要性能参数的优化判据,讨论了混合功率系统中的一些不可逆损失对系统优化性能的影响.本文所得的结果可为实际SOFC-VTIG混合功率系统的优化设计和运行提供理论依据.

Performance characteristics and optimal analysis of a fuel cell-vacuum thermionic generator hybrid system

Based on the current models of solid oxide fuel cell（SOFC） and vacuum thermionic generator（VTIG）, a general model of a class of an irreversible SOFC-VITG hybrid power system, in which irreversibilities existing in real hybrid system are take into account, is established. Expressions for the efficiency and power output of hybrid power system are analytically derived by the model. By using numerical simulation, the relational curves of the efficiency and power output varying with some important performance parameters of the hybrid system are obtained. The performance characteristics of the hybrid system are presented. The optimum criteria of several important performance parameters are given. The effects of several irreversible loses of the hybrid power system on optimum performance are discussed. The results obtained in this paper can provide some theoretical guidance for the optimization design and operation of practical SOFC-VTIG hybrid power system.