氮膨胀制冷闪蒸气再液化工艺模拟与优化  

Simulation and optimization of boil off gas re-liquefaction process using nitrogen expansion refrigeration

作　　者：闫明月 韦丽娃[2] 商丽艳[3] 周莉[4] YAN Ming-yue;WEI Li-wa;SHANG Li-yan;ZHOU Li(College of Petroleum Engineering,Liaoning Shihua University,Fushun 113001,China;College of Mechanical Engineering,Liaoning Shihua University,Fushun 113001,China;College of Environmental and Safety Engineering,Liaoning Shihua University,Fushun 113001,China;College of Petroleum and Chemical,Liaoning Shihua University,Fushun 113001,China)

机构地区：[1]辽宁石油化工大学石油天然气工程学院,辽宁抚顺113001 [2]辽宁石油化工大学机械工程学院,辽宁抚顺113001 [3]辽宁石油化工大学环境与安全工程学院,辽宁抚顺113001 [4]辽宁石油化工大学石油化工学院,辽宁抚顺113001

出　　处：《天然气化工—C1化学与化工》2020年第6期68-74,共7页Natural Gas Chemical Industry

基　　金：辽宁省博士科研启动基金(2019-BS-159)。

摘　　要：采用氮气膨胀制冷闪蒸汽(BOG)再液化工艺,利用Aspen Plus建立流程模拟,以单位能耗(SPC)为目标函数,通过参数灵敏度分析确定了决策变量,并利用MATLAB建模优化了变量取值。对优化后液化流程的分析表明,SPC为0.8021 kW·h/kg、性能系数为0.20、火用效率为36.56%、产品花费为249.61元/h,相较初始值均有所提高。通过火用分析和换热器分析,对系统主要设备的能效进行了探究,发现优化后设备运行同样具备优势,新工艺实现最佳节能效果。The method of nitrogen expansion refrigeration for boil off gas(BOG)re-liquefaction process was used,and Aspen Plus was used to establish the process simulation.Taking specific power consumption(SPC)as the objective function,the decision variables were determined by parameter sensitivity analysis,and the values of the variables were optimized by using MATLAB modeling.The analysis of the optimized liquefaction process shows that the SPC is 0.8021 kW·h/kg,the coefficient of the perform-ance is 0.20,the exergy efficiency is 36.56%,and the product cost is 249.61 yuan/h,which are all improved compared with the initial values.The energy efficiency of the main equipment of the system was explored through the analysis of exergy analysis and heat exchanger.It is found that the optimized equipment also has advantages in operation,and the new process achieves the best energy-saving effect.

关 键 词：LNG 膨胀制冷 闪蒸气 模拟 火用分析 优化 

分 类 号：TE8[石油与天然气工程—油气储运工程] TE646