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简要回顾以氨气压缩制冷为复合循环间接空气冷却系统的正循环系统(简称“压缩制冷复合循环间冷系统”)的构建及工作原理。基于热力学原理拟订了制冷循环热经济性能评价方法和评价指标;以蒙东某地亚临界600 MW直冷机组为比较基准,进行了同环境、同容量、同型号但不同低压缸的虚拟压缩制冷复合循环间冷机组的热经济性能评价指标的虚拟计算。从理论上导出了制冷循环年累计产/耗电量比大于1的存在必要条件为转捩温度Tt必须高于正/逆制冷循环切换温度Ts,且高得越多,热经济性能越佳;揭示了转捩温度的数值大小与产能和耗能设备的效率密切相关,切换温度与汽轮机排气背压及机组安装地的气象条件有关。
Briefly review the construction and working principle of the positive circulation system (referred to as “compressed refrigeration combined cycle cold system ”) that uses ammonia compression refrigeration as the indirect air cooling system of the compound cycle. Based on the principle of thermodynamics, the evaluation methods and evaluation indexes of thermal economy of refrigeration cycle are formulated. Based on the comparison of the sub-critical 600 MW direct-cooling units in a certain area of Mengdong, a comparison is made between the virtual compression refrigeration with same environment, same capacity, Virtual Calculation of Evaluation Indexes of Thermal Economic Performance for Combined Cooling Units. It is deduced theoretically that it is necessary for the cumulative production / consumption ratio greater than 1 in the refrigeration cycle to be that the transition temperature Tt must be higher than the switching temperature Ts of the positive / negative refrigeration cycle and the higher the higher, the better the thermal economy performance; It is revealed that the value of transition temperature is closely related to the productivity and efficiency of energy consuming equipment. The switching temperature is related to the exhaust pressure of steam turbine and the meteorological conditions of the installation site of the turbine.