文档介绍：第三届中国 LNG 论坛论文编号:1270501
利用城市天然气管网压能的 LNG 液化流程模拟分析
李翠超,吴江涛,毕胜山,张雷,孟现阳
(西安交通大学热流科学与工程教育部重点实验室,西安,710049)
摘要:针对城市天然气调峰及管网压力能回收利用的需要,本文提出在天然气门站调压过程中引入小型天然气液化
装置,提出了一种新型的天然气膨胀预冷混合制冷剂液化流程 NGE/MRC,NGE/MRC 流程将高压天然气膨胀作为预
冷工艺,结合混合制冷剂深度制冷,可以充分利用天然气管网间的压力能,高效生产低成本的液化天然气。在 Aspen
Plus 模拟软件环境下,本文完成了稳态条件下全流程的热力学模拟计算,系统液化率为 95%,单位 LNG 能耗为
J·kmol-1,与已有的丙烷预冷混合制冷剂流程与氮-甲烷膨胀流程相比,NGE/MRC 流程在液化率及能耗方面都更具优
势。本文还基于有效能分析理论,对液化流程进行能量分析,得到各个部件的损分布情况,为流程节能优化提
供参考。
关键词:液化天然气燃气调峰流程模拟有效能评价
The simulation of natural gas liquefaction process with the
utilization of pressure energy of city gas pipeline
Li Cuichao,Wu Jiangtao,Bi Shengshan,Zhang Lei,Meng Xianyang
(The Key Laboratory of Thermofluid Science and Engineering, Xi’an Jiaotong University, Xi’an 710049,China.)
Abstract: The objective of this study proposing natural gas liquefaction facilities into the regulating process in natural gas
station is peak-shaving for city gas as well as recovering of pressure energy. A new natural gas liquefaction process
(NGE/MRC) which has advantage in energy saving and efficiency has been designed, the NGE/MRC includes a mixed
refrigerant liquefaction cycle and a natural gas expander pre-cooled to chemical process simulation software
Aspen Plus, the simulation calculation to the whole natural gas liquefaction process at its steady-state condition was
results