Thermal performance assessment of cryogenic transfer line with support and multilayer insulation for cryogenic fluid
Thermal performance assessment of cryogenic transfer line with support and multilayer insulation for cryogenic fluid
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DOI：
10.1016/j.apenergy.2019.05.025
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发表时间：
2019-09
期刊：
影响因子：
11.2
通讯作者：
Bicai Deng;Shaoqi Yang;Xin Xie;Yanjuan Wang;Pan Wei;Qing Li;L. Gong
中科院分区：
文献类型：
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作者：
Bicai Deng;Shaoqi Yang;Xin Xie;Yanjuan Wang;Pan Wei;Qing Li;L. Gong
在聚变能、氢能等领域中，低温输送管道是输送低温流体的重要设备。本文的主要目的是评估和减少低温输送线的热泄漏。设计了一种具有三种支撑结构和典型多层绝热材料的三通道同轴液氦管道。在卧式液氮低温输送线试验平台上，对采用三种支撑结构的低温输送线以及不同层密度和层数的MLI进行了试验研究。在边界温度77 K ~ 293 K范围内，对直管和弯管的传热性能，包括漏热和温度分布进行了数值分析和实验研究。将模拟结果与实验结果进行比较，最大偏差分别小于10%、10.7%和6.6%。在此基础上，双板支撑和50层/cm和25层/cm多层膜的最小热漏分别为0.200 W和0.488 W。在双层支撑和MLI分别为50层和25层/cm时，直管和弯管的最小漏热量分别为0.688 W和0.858 W。研究结果已成功应用于250W@4.5K氦制冷机。该新的实用评估方法还可用于最大限度地减少不同尺寸、支撑和MLI等低温输送管道的热泄漏，从而提高系统的能源效率。
Cryogenic transfer lines are very important to transport cryogenic fluid in the fields of fusion energy and hydrogen energy. The main aim of this work is to assess and minimize heat leakage of cryogenic transfer line. A three-channel coaxial liquid helium pipe with three support structures and typical multilayer insulation (MLI) materials was designed. Cryogenic transfer lines installed three support structures and MLI with different layer density & number of layer were studied based on a horizontal cryogenic transfer line test platform with liquid nitrogen. Thermal performance including heat leakage and temperature distribution of straight and elbow pipe have been numerically and experimentally analyzed for boundary temperature 77 K–293 K. By comparing simulated results with experimental heat leakages of supports, MLI and cryogenic transfer lines, the largest deviations are less than 10%, 10.7% and 6.6%, respectively. Based on above analysis, the minimal heat leakages of two-plate support and MLI with 50 layers and 25 layers/cm are 0.200 W and 0.488 W, respectively. Furthermore, the minimal heat leakages of straight pipe and elbow pipe were acquired as the values of 0.688 W and 0.858 W with two-plate support and MLI under 50 layers and 25 layers/cm. The results have been successfully applied in 250 W@4.5 K helium cryogenic refrigerator. The new and useful assessment method could also be applied to minimize heat leakage of cryogenic transfer lines with different size, support and MLI, etc, and then to improve the energy efficiency of system.