固体氧化物燃料电池-斯特林热机混合动力系统的性能优化

应用电化学、非平衡态热力学和有限时间热力学等理论,建立包含多种不可逆损失的固体氧化物燃料电池与斯特林热机组合而成的混合动力循环系统理论模型,导出混合系统的输出功率和效率的表达式,确定混合系统的最大输出功率和最大效率及其工作在最大输出功率或工作在最大效率时的运行条件,给出系统的优化工作区域,详细讨论了热力学循环过程的不可逆性对混合系统优化性能的影响,探讨了固体氧化物燃料电池与斯特林热机之间的最佳匹配关系.所得结果可为实际混合动力系统的设计和优化运行提供理论依据.

Performance optimization of a solid oxide fuel cell-stirling heat engine hybrid power system

Based on the theory of the electrochemistry, non-equilibrium thermodynamics and finite-time thermodynamics, a new theoretical model of the hybrid power system consisting of an existing solid oxide fuel cell and a Stirling heat engine is established, in which some main irreversible losses existing real hybrid systems are taken into account. Expressions for the power output and efficiency of the hybrid system are derived from this model. The maximum power output and maximum efficiency of the hybrid system and the operating conditions of the maximum power output and maximum efficiency are determined. The optimally working regions of the hybrid system are given. The influences of some cyclic irreversibilities on the optimal performance of the system are discussed in detail. The best matching relationship between an existing solid oxide fuel cell and a Stirling heat engine is discussed. All the results obtained in this paper will provide some theoretical basis for the design and optimal operation of practical fuel cell-Stirling heat engine hybrid system.