黄土层温度对液化天然气地下储罐罐内液体分层翻滚影响研究  

Study on Impact of Loess Layer Temperature on Liquid Stratification Rollover in Liquefied Natural Gas Underground Storage Tanks

作　　者：于春柳 芦娅妮 康进科 顾颖 YU Chun-liu;LU Ya-ni;KANG Jin-ke;GU Ying(Petrochemical College of Longdong University,Qingyang 745000,China;Tianhua Chemical Machinery Research Institute,Lanzhou 730000,China)

机构地区：[1]陇东学院石油化工学院,甘肃庆阳745000 [2]天华化工机械研究院,甘肃兰州730000

出　　处：《石油化工设备》2025年第1期20-25,共6页Petro-Chemical Equipment

基　　金：庆阳市科技计划项目(QY-STK-2022B-149):黄土层温度对LNG地下储罐热力学性能影响研究。

摘　　要：液化天然气(LNG)采用地下储罐方式存储时,会受罐外黄土层温度影响而发生不同程度的漏热,进而组分发生变化引起翻滚,LNG翻滚会造成储罐超压甚至爆炸。以已经发生分层的5 000 m^(3)地下LNG储罐罐内相邻两液层为研究对象,采用有限元分析法,对春、夏、秋、冬四季不同黄土层温度下的分层液体进行翻滚过程数值模拟,分析对比四季LNG液层的密度、速度场数值,总结变化规律。结果表明,夏季黄土层温度最高,对液层翻滚影响最大,春、秋两季的影响次之,冬季影响最小。四季液层平均密度差异随时间t变化明显,且冬、夏两季液层平均密度差异最大,t=200 s时,差值为5.693 kg/m^(3);t=1 200 s,差值达16.216 kg/m^(3)。可为LNG地下储罐设计季节性绝热装置、提高LNG的无损存储效率提供参考。When liquefied natural gas(LNG)is stored in underground tanks,it can be affected by the temperature ofthe surrounding loess layer,resulting in different heat losses.It can also change its composition and cause rollover.LNG rollover can result in overpressure or explosion within the storage tank.Taking the adjacent two liquid layers within a 5000 m^(3) stratified underground LNG storage tank as the research object,a finite element analysis method was used to perform numerical simulations of the rollover process for the stratified liquids at different temperatures within the loess layers during the spring,summer,autumn and winter seasons.The numerical values ofthe density and velocity fields ofthe LNG liquid layers during the four seasons were analysed and compared,and the patterns of variation were summarised.The results show that the highest temperature of the loess layer in summer has the greatest influence on the liquid layer rollover,followed by spring and autumn,while winter has the least influence.The average density difference between the liquid layers during the four seasons varies significantly over time t,with the difference being greatest between winter and summer.At t=200 s the difference is 5.693 kg/m^(3);at t=1200 s the difference reaches 16.216 kg/m^(3).These results provide valuable insights for the design of seasonal insulation devices for underground LNG storage tanks and for improving the loss-free storage process of LNG.

关 键 词：黄土层温度 地下LNG储罐 翻滚 密度差 

分 类 号：TQ050[化学工程] TE9[石油与天然气工程—石油机械设备]