充满率对有导热带低温容器贮存过程影响研究  

Study on the effect of filling rate on the storage process of cryogenic vessels with thermal strap

作　　者：于春柳[1] 任金平[1] 何枭 Yu Chunliu;Ren Jinping;He Xiao(College of Chemistry and Chemical Engineering,Longdong University,Qingyang 745000,China;Jilin Oilfield Administration Agricultural industrial and Commercial Enterprise Corporation,Songyuan 138000,China)

机构地区：[1]陇东学院化学化工学院,庆阳745000 [2]吉林省油田管理局农工商企业总公司,松原138000

出　　处：《低温与超导》2020年第12期19-24,共6页Cryogenics and Superconductivity

基　　金：甘肃省科技计划项目(17YF1GM045)资助。

摘　　要：采用数值模拟的方法对有导热带的低温容器进行分析,研究充满率对无损贮存热力过程的影响,得到充满率分别为65%、75%和85%时不同时刻容器内流体温度场和速度场云图。分析发现无论充满率为多少,容器内气相空间的BOG温度升高都比较快,气液界面处有明显的温度分层和速度场变化,运动比较剧烈;开始时导热带向BOG传递冷量,最后导热带向液氮主体区传递外界热量,其周围与之接触的液氮有明显的温度分层现象;充满率75%的液氮温度场和速度场变化比充满率65%的慢,比充满率85%的快。这表明有导热带的低温容器充满率越大,容器内低温液体无损贮存时间越长。In order to study the influence of filling rate on the thermal and mechanical process during zero boiling-off storage of cryogenic vessels with thermal strap, a numerical simulation method was used to analyze the cryogenic vessels with thermal strap, the cloud maps of the fluid temperature field and velocity field were obtained at different times when the filling rate of this vessel was 65%, 75% and 85% respectively.The analysis finds the BOG temperature rises faster in vapor space of the vessel, and there is obvious temperature stratification and velocity field change at the gas-liquid interface, and the motion is quite violent, no matter how much the filling rate is.At the beginning, the thermal strap transfers the cooling amount to BOG, it transfers the external heat to the main body of liquid nitrogen at last, and the liquid nitrogen around it has obvious temperature stratification phenomenon.The temperature field and velocity field of 75% liquid nitrogen change more slowly than that of 65% and faster than that of 85%.This indicates that the higher filling rate of the cryogenic vessel with thermal strap, the longer the zero boiling-off storage time of the cryogenic liquid.

关 键 词：低温容器 BOG 充满率 导热带 

分 类 号：TB661[一般工业技术—制冷工程]