恒温热源不可逆中冷回热布雷顿热电联产装置的[火用]经济性能优化

Exergoeconomic Performance Optimization of an Irreversible Intercooling Recuperative Brayton Cogeneration Plant With a Constant Temperature Heat Source

用有限时间热力学理论和方法研究了恒温热源不可逆中冷回热布雷顿热电联产装置的火用经济性能,导出了无量纲利润率和火用效率的解析式。以利润率和火用效率为目标,通过数值计算对热导率的分配、中间压比的选取进行了优化,得到了最大利润率和火用效率。进一步对总压比进行优化,得到了双重最大利润率,但火用效率不存在双重最大值。详细分析了设计参数对联产装置最优性能的影响,发现存在最佳用户侧温度使利润率取得三重最大值。

By adopting the finite-time thermodynamic theory and method,studied was the exergoeconomic performance of an irreversible intercooling recuperative Brayton cogeneration plant with a constant temperature heat source and derived was an analytic formula for calculating a non-dimensional profit rate and exergy efficiency.With the profit rate and exergy efficiency serving as the targets,an optimization was performed of the distribution of the heat conductivities and choice of the intermediate pressure ratio through a numerical calculation.On this basis,the maximum profit rate and exergy efficiency were obtained.With the total pressure ratio being further optimized,a dual maximum profit rate was obtained but no dual maximum value for the exergy efficiency existed.Through a detailed analysis of the influence of the design parameters on the optimum performance of the plant,it has been found that there exists an optimum user-side temperature to make the profit rate have a triple maximum value.