天然气液化级联混合制冷剂多级节流研究  

Research on multistage throttling mechanisms in natural gas liquefaction process using a mixed refrigerant cascade system

作　　者：孙娟 史世杰 万广浩 李沅欣 孙兰义[2] Sun Juan;Shi Shijie;Wan Guanghao;Li Yuanxin;Sun Lanyi(Sinopec Petroleum Engineering Zhongyuan Corporation,Zhengzhou 450000,China;State Key Laboratory of Heavy Oil Processing,College of Chemistry and Chemical Engineering,China University of Petroleum(East China),Qingdao 266580,China)

机构地区：[1]中国石化中原石油工程设计有限公司,郑州450000 [2]中国石油大学(华东)化学化工学院重质油国家重点实验室,青岛266580

出　　处：《低温与超导》2024年第12期70-79,共10页Cryogenics and Superconductivity

基　　金：国家自然科学基金(22078361)资助。

摘　　要：在天然气级联混合制冷液化工艺的基础上,设计出预冷段四级节流和液化段二级节流的级联混合制冷液化工艺的新流程。使用Aspen HYSYS和Matlab的遗传算法接口工具箱,采用改进非支配排序遗传算法,以系统最小比功耗为目标,对设计的新流程的操作参数进行全局优化,优化后系统最小比功耗降低至5.09 kWh/kmol LNG,比优化前降低了5.9%。Based on the cascade mixture refrigeration liquefaction process of natural gas,a new liquefaction process with four-stage throttling in precooling section and two-stage throttling in liquefaction section was proposed.Using the genetic algo⁃rithm interface toolbox of Aspen HYSYS and Matlab,the modified non-dominated sequencing genetic algorithm was adopted to globally optimize the operating parameters of the proposed new process,aiming at the minimum specific power consumption of the system.After optimization,the minimum specific power consumption of the system is reduced to 5.09 kWh/kmol LNG,which is 5.9%lower than before optimization.

关 键 词：级联混合制冷 节流级数 比功耗 

分 类 号：TE646[石油与天然气工程—油气加工工程]