某些天然气凝液回收系统采用制冷作为液体回收过程的一个组成部分。且这些过程中,制冷系统的能耗是非常大的。因此,必须密切注意制冷系统的效率。美国天然气管道公司(NGPL)370号加工厂正在运行的丙烷制冷系统就是按将其功率降到最低程度而设计的。此系统(图1)的设计负荷是将24×10~6m~3/d的天然气从24℃冷却到—29C, Some natural gas condensate recovery systems use refrigeration as an integral part of the liquid recovery process. And in these processes, the energy consumption of the refrigeration system is very large. Therefore, close attention must be paid to the efficiency of the refrigeration system. The propane refrigeration system that NGG Plant 370 runs is designed to minimize its power. The design load of this system (Figure 1) is to cool 24 × 10 ~ 6m ~ 3 / d of natural gas from 24 ℃ to -29 ℃,