内可逆回热式燃气轮机热电联产装置的[火用]经济性能优化

EXERGOECONOMIC PERFORMANCE OPTIMIZATION FOR ENDOREVERSIBLE REGENERATIVE GAS TURBINE COGENERATION PLANT

应用有限时间热力学方法,研究了恒温热源条件下内可逆回热式燃气轮机热电联产装置的(火用)经济性能,导出了利润率及(火用)效率的解析式。利用数值计算方法,以利润率为目标,对热导率的分配和压比的选取进行了优化,研究了最优利润率及相应(火用)效率特性,并分析了各种联产设计参数对联产优化性能的影响。改进了以往文献中热量(火用)的计算方法,发现了存在最佳的用户侧温度。

The exergoeconomic performance of an endoreversible regenerative gas turbine cogeneration plant coupled to constant temperature heat reservoirs is investigated using finite time thermodynamics. The analytical formulae about profit rate and exergy efficiency are deduced. By means of numerical calculations, the heat conductance allocation and pressure ratio are optimized by taking the profit rate as the objective. The characteristic of optimal dimensionless profit rate and corresponding exergy efficiency is investigated and the effects of design parameters on optimal performance of cogeneration plant are also analyzed. The calculation method of exergy output rate of the process heat in the previous literatures is modified. It is found that there exists an optimal consumer-side temperature.