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应用有限时间热力学理论和方法建立了恒温热源不可逆两级中冷回热再热布雷顿热电联产装置模型,基于分析的观点,导出了装置无量纲输出率和效率的解析式。在给定总压比的情形下,通过数值计算分别研究了输出率和效率与两个中冷压比和两个再热压比的关系,当总压比变化时,发现输出率和效率对总压比存在最大值,并分别求出了两个相应的最佳的中冷压比和再热压比。分析了回热度、中冷度、再热度、压气机和涡轮机效率、压降损失等特征参数对装置性能的影响。最后发现分别存在最佳的用户侧温度使输出率和效率取得双重最大值。
Based on the analysis of point of view, the analytic formula of dimensionlessness, output rate and efficiency of the device is derived based on the theory and method of finite-time thermodynamics. In a given total pressure ratio, the relationship between the output rate and the efficiency and the two intermediate pressure ratio and the two reheat pressure ratio were studied by numerical calculation. When the total pressure ratio changes, it is found that the output rate And the efficiency of the total pressure ratio exists the maximum value, and respectively obtained two corresponding optimal cold to medium pressure ratio and reheat pressure ratio. The influence of parameters such as heat recovery, intercooling, reheat, compressor and turbine efficiency and pressure drop loss on the performance of the device was analyzed. Finally, it is found that there exists an optimal user-side temperature to achieve a double maximum of the output rate and the efficiency.