导热带对低温容器内BOG再液化过程影响研究  

Study on the effect of thermal strap on BOG reliquefaction process in cryogenic vessel

作　　者：于春柳[1] 顾颖 任金平[1] 任永平[3] 张琪 Yu Chunliu;Gu Ying;Ren Jinping;Ren Yongping;Zhang Qi(College of Chemistry and Chemical Engineering,Longdong University,Qingyang 745000,China;Tianhua Institute of Chemical Machinery&Automation Co.,Ltd,LanZhou 730060,China;College of Petrochemical Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]陇东学院化学化工学院,庆阳745000 [2]天华化工机械及自动化研究设计院有限公司,兰州730060 [3]兰州理工大学石油化工学院,兰州730050

出　　处：《低温与超导》2021年第12期65-69,共5页Cryogenics and Superconductivity

基　　金：甘肃省科技计划(17YF1GM045);甘肃省高等学校创新能力提升项目(2019B-156、2021A-125);陇东学院青年科技创新基金(XYZK202006)资助。

摘　　要：采用有限元分析软件对容器内BOG再液化过程进行数值模拟,研究制冷机开启后导热带对流体温度场和速度场影响规律。结果显示:由于导热带长度不同,容器中产生过冷液氮的位置不同,温度场和速度场分布也有很大差异;开始流体温度分层明显,流动比较剧烈,形成了沿导热带两侧对称分布的多个涡旋,随后温度场和速度场分布趋于均匀,流动减缓,涡旋逐渐消失;但是在同一时刻,随着导热带长度的增大,温度分层减弱,导热带两侧对称分布的涡旋减少,温度和速度分布趋于均匀所需时间变短。说明导热带除传输冷量外,还可平衡流体温度场和速度场分布,消除温度分层和涡旋,防止低温液体翻滚。The reliquefaction process of BOG in a vessel was numerically simulated by using the finite element analysis software in order to study the influence law of the thermal strap on the temperature field and the velocity field of the fluid after the refrigerator was opened. The results show that the location of the supercooled liquid nitrogen in the vessel is different due to the different length of the thermal strap and the distributions of the temperature field and the velocity field are also very different. At the beginning the fluid temperature stratification is obvious and its flow is relatively intense, forming a number of vortices symmetrically distributed along both sides of the thermal strap, then the distributions of temperature and velocity fields tend to be uniform, the flow slows down, and the vortices gradually disappear. However, at the same time, with the increase of the length of the thermal strap, the temperature stratification weakens, the eddy symmetrically distributed on both sides of the thermal strap decreases, and the time required for the temperature and velocity distribution to be uniform becomes shorter.These indicates that the thermal strap not only transmits cold capacity, but also balances the distributions of fluid temperature field and velocity field of the fluid, eliminating temperature stratification and eddy, and preventing the tumbling of cryogenic liquid.

关 键 词：低温容器 导热带 低温液体 闪蒸气 再液化 

分 类 号：V511.6[航空宇航科学与技术—航空宇航推进理论与工程]