Chemical engine is an abstract model of some devices, such as solid state, photochemical, and electrochemical devices, photovoltaic cell, and mass exchangers. Finite chemical-potential source is one of its features. Finite time thermodynamics provides effective theoretical tool for determining performance limits for given thermal systems, and determining optimal process paths of thermal systems for given performance objectives. Endoreversible model is its basic model. A model of endoreversible non-isothermal chemical engines operating between a finite chemical-potential source and an infinite chemical-potential sink with mass resistance and heat resistance is established. Mass transfer processes between chemical potential reservoir and working fluid of the model are assumed to obey Onsager equations in linear irreversible thermodynamics. With a fixed cycle period, optimal cycle configuration for the maximum work output of the model is derived by applying optimal control theory. The results obtained include optimal performance and optimal path results in many previous literatures, and can provide some theoretical guidelines for optimal designs of practical chemical plants.

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有限势源内可逆非等温化学机的最大功构型

化学引擎是一些设备的抽象模型，例如固态、光化学和电化学设备、光伏电池和质量交换器。有限的化学势源是其特点之一。有限时间热力学为确定给定热系统的性能限制以及为给定性能目标确定热系统的最佳过程路径提供了有效的理论工具。Endoreversible模型是它的基本模型。建立了在有限化学势源和具有质量电阻和热电阻的无限化学势汇之间运行的内可逆非等温化学发动机模型。假定模型的化学势库和工作流体之间的传质过程服从线性不可逆热力学中的 Onsager 方程。在固定循环周期的情况下，应用最优控制理论推导了模型最大功输出的最优循环配置。得到的结果包括以往许多文献中的最优性能和最优路径结果，可为实际化工厂的优化设计提供一定的理论指导。