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针对国内某天然气处理厂液化制冷系统的能耗及有效能进行了优化和分析,并提出了装置改进意见。该厂日处理天然气150 m~3/d,天然气液化制冷装置采用Linde混合制冷循环工艺,目前尚无针对该天然气液化制冷系统的相关文献与研究。本文用AspenPlus软件建立流程模型,进行模拟计算,并根据计算所得热力学数据,分析冷剂压缩、换热、节流阀节流降压及冷剂混合等4个过程的有效能。结果表明,它们有效能的损失分别为9 395 kW、3 887 kW、1 191 kW、627 kW,共计为15 100 kW。可见Linde液化制冷循环的有效能损失,主要发生在压缩过程和冷剂换热之中,分别占总有效能损失的62.2%、25.7%,因此这2个过程是节能降耗的重点。
In view of the optimization and analysis of the energy consumption and the effective energy of liquefaction refrigeration system in a natural gas processing plant in China, suggestions for improvement of the device are put forward. The plant daily processing of natural gas 150 m ~ 3 / d, natural gas liquefaction refrigeration equipment using Linde hybrid refrigeration cycle, there is no relevant literature and research for the natural gas liquefied refrigeration system. In this paper, the process model is established by AspenPlus software, and the simulation calculation is carried out. Based on the calculated thermodynamic data, the effective energy of four processes such as refrigerant compression, heat exchange, throttling and depressurization of throttle valve, and refrigerant mixture are analyzed. The results show that their effective losses are 9,395 kW, 3,887 kW, 1,191 kW and 627 kW, respectively, amounting to 15,100 kW. It can be seen that the effective loss of Linde liquefaction and refrigeration cycle mainly occurs in the compression process and the heat exchange between the two components, accounting for 62.2% and 25.7% of the total effective loss respectively. Therefore, the two processes are the focus of energy saving and consumption reduction.