针对LNG接收站BOG再冷凝工艺预冷法优化方案的改进
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摘要
国内外学者提出过许多关于液化天然气(liquefied natural gas,LNG)接收站蒸发气(boil-off gas,BOG)再冷凝工艺的优化方案。其中,采用预冷法对再冷凝工艺进行优化的方案由于前期投入较少且优化效果明显,更具有现实意义。然而,现有的预冷法优化方案还存在着优化原则不清晰和考虑工况不全面等问题。本文介绍了LNG接收站现有BOG再冷凝工艺流程与经预冷法优化后的再冷凝工艺流程,分析得到了预冷法优化的理论原理。针对接收站两种典型工况提出了相应的优化原则。以江苏如东LNG接收站现有再冷凝工艺流程为计算实例,运用HYSYS软件对优化前后的再冷凝工艺进行模型建立与流程模拟,应用所建模型对优化前后的再冷凝工艺总功耗进行对比分析。结果表明:经改进后的再冷凝工艺预冷法优化方案可以有效地根据相应的优化原则对两种典型工况进行优化。通过将研究成果应用于江苏如东LNG接收站可知,在两种典型工况下,优化后的BOG再冷凝工艺较原工艺分别节约系统总功耗9.8%和21.5%。
Domestic and foreign scholars have proposed many optimization schemes for the recondensation process of boil-off gas(BOG) in liquefied natural gas(LNG) terminals. The pre-cooling optimization scheme has more practical significance because of less initial investment and obvious optimization effect. However, the existing pre-cooling optimization scheme has problems such as unclear optimization principles and incomplete consideration of working conditions. Therefore, this paper introduced the existing re-condensation process in LNG terminals and the process optimized by precooling method. The theoretical principle of the pre-cooling optimization method was obtained and corresponding optimization principles for two typical operating conditions in LNG terminals were proposed. The existing recondensation process of Rudong LNG terminal in Jiangsu province was used as an example. The models were established and the recondensation process was simulated before and after optimization using HYSYS. A comparative analysis of the total power-consumption of the recondensation process before and after optimization was carried out using the built-in model built in HYSYS. The result showed that the improved pre-cooling optimization scheme can effectively optimize the two typical working conditions according to the corresponding optimization principle. The application of the research results at the Rudong LNG terminal in Jiangsu indicated that the improved pre-cooling optimization scheme resulted in 9.8% and 21.5% energy reduction, respectively, under the two typical operating conditions.
Domestic and foreign scholars have proposed many optimization schemes for the recondensation process of boil-off gas(BOG) in liquefied natural gas(LNG) terminals. The pre-cooling optimization scheme has more practical significance because of less initial investment and obvious optimization effect. However, the existing pre-cooling optimization scheme has problems such as unclear optimization principles and incomplete consideration of working conditions. Therefore, this paper introduced the existing re-condensation process in LNG terminals and the process optimized by precooling method. The theoretical principle of the pre-cooling optimization method was obtained and corresponding optimization principles for two typical operating conditions in LNG terminals were proposed. The existing recondensation process of Rudong LNG terminal in Jiangsu province was used as an example. The models were established and the recondensation process was simulated before and after optimization using HYSYS. A comparative analysis of the total power-consumption of the recondensation process before and after optimization was carried out using the built-in model built in HYSYS. The result showed that the improved pre-cooling optimization scheme can effectively optimize the two typical working conditions according to the corresponding optimization principle. The application of the research results at the Rudong LNG terminal in Jiangsu indicated that the improved pre-cooling optimization scheme resulted in 9.8% and 21.5% energy reduction, respectively, under the two typical operating conditions.
引文
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[16]张学学.热工基础[M].2版.北京:高等教育出版社,2006:115-116.ZHANG Xuexue.Thermal foundation[M].2nd ed.Beijing:Higher Education Press,2006:115-116.
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[2]WU Ming,ZHU Zuoliang,SUN Dongxu,et al.Optimization model and application for the recondensation process of boil-off gas in a liquefied natural gas receiving terminal[J].Applied Thermal Engineering,2019,147:610-622.
[3]李亚军,陈行水.液化天然气接收站蒸发气体再冷凝工艺控制系统优化[J].低温工程,2011(3):44-49.LI Yajun,CHEN Xingshui.Optimization of control system to BOGrecondensation process at LNG receiving termina[J].Cryogenics,2011(3):44-49.
[4]陈行水.LNG接收站再冷凝工艺模型与动态优化[D].广州:华南理工大学,2012.CHEN Xingshui.Modeling and dynamic optimization of recondensation process at LNG receiving terminals[D].Guangzhou:South China University of Technology,2012.
[5]李亚军,陈蒙.LNG接收站BOG多阶压缩再液化工艺优化分析[J].化工学报,2013,64(3):986-992.LI Yajun,CHEN Meng.Simulation-based optimization and analysis of BOG multi-stage compression and recondensation process at LNGreceiving terminal[J].CIESC Journal,2013,64(3):986-992.
[6]KWAK D H,HEO J H,PARK S H,et al.Energy-efficient design and optimization of boil-off gas(BOG)re-liquefaction process for liquefied natural gas(LNG)-fuelled ship[J].Energy,2018,148:915-929.
[7]TAN H,SHAN S,NIE Y,et al.A new boil-off gas re-liquefaction system for LNG carriers based on dual mixed refrigerant cycle[J].Cryogenics,2018,92:84-92.
[8]薛倩,刘名瑞,肖文涛,等.LNG接收站BOG处理工艺优化及功耗分析[J].油气储运,2016,35(4):376-380.XUE Qian,LIU Mingrui,XIAO Wentao,et al.Optimization and energy consumption analysis of BOG treatment processes in LNG terminal[J].Oil&Gas Storage&Transportation,2016,35(4):376-380.
[9]刘迪,杜伟婧.LNG接收站BOG再冷凝工艺的模拟及优化[J].石油化工应用,2016,35(6):130-134.LIU Di,DU Weijing.Simulation and optimization of LNG terminal's BOG recondensation process[J].Petrochemical Industry Application,2016,35(6):130-134.
[10]杨志国,李亚军.液化天然气接收站蒸发气体再冷凝工艺的优化[J].化工学报,2009,60(11):2876-2881.YANG Zhiguo,LI Yajun.Optimization of boil-off gas recondensation process in LNG receiving terminal[J].CIESC Journal,2009,60(11):2876-2881.
[11]曹玉春,陈其超,陈亚飞,等.液化天然气接收站蒸发气回收优化技术[J].化工进展,2016,35(5):1561-1566.CAO Yuchun,CHEN Qichao,CHEN Yafei,et al.The optimization of BOG recycling at LNG receiving terminal[J].Chemical Industry and Engineering Progress,2016,35(5):1561-1566.
[12]王小尚,刘景俊,李玉星,等.LNG接收站BOG处理工艺优化--以青岛LNG接收站为例[J].天然气工业,2014,34(4):125-130.WANG Xiaoshang,LIU Jingjun,LI Yuxing,et al.A case study of processing and optimization of BOG gas treatment in an LNG terminal in Qingdao[J].Natural Gas Industry,2014,34(4):125-130.
[13]顾安忠,鲁雪生.液化天然气技术手册[M].北京:机械工业出版社,2010:146.GU Anzhong,LU Xuesheng.Liquefied natural gas technical manual[M].Beijing:China Machine Press,2010:146.
[14]刘浩,金国强.LNG接收站BOG气体处理工艺[J].化工设计,2006,16(1):13-16.LIU Hao,JIN Guoqiang.BOG processing technology at LNG receiving terminals[J].Chemical Engineering Design,2006,16(1):13-16.
[15]向丽君,全日,邱奎,等.LNG接收站BOG气体回收工艺改进与能耗分析[J].天然气化工(C1化学与化工),2012,37(3):48-50.XIANG Lijun,QUAN Ri,QIU Kui,et al.LNG terminal BOG recovery process improvement and energy saving analysis[J].Natural Gas Chemical Industry,2012,37(3):48-50.
[16]张学学.热工基础[M].2版.北京:高等教育出版社,2006:115-116.ZHANG Xuexue.Thermal foundation[M].2nd ed.Beijing:Higher Education Press,2006:115-116.
[17]STRYJEK R,VERA J H.PRSV:an improved peng-robinson equation of state for pure compounds and mixtures[J].Canadian Journal of Chemical Engineering,2010,64(2):323-333.
[18]顾安忠,鲁雪生,石玉美.液化天然气技术[M].2版.北京:机械工业出版社,2015:19.GU Anzhong,LU Xuesheng,SHI Yumei.Liquefied natural gas technology[M].2nd ed.Beijing:China Machine Press,2015:19.