低温输送系统的CO_2冷凝真空绝热方案研究

A Study of CO_2 Condensing-Vacuum Insulation in Cryogenic Transfer System

采用在真空夹层中充注纯度不高的一般工业用 CO2 的方法 ,来研究不同充注压力及不同绝热层材料下低温输送管路中的 CO2 冷凝真空绝热问题 ;分析了 CO2 纯度对绝热层真空度的影响。测量并计算了管路内充满液氮后真空绝热层的真空度、真空绝热层外壁壁温和绝热层的表观导热率。结果表明 ,在低真空绝热夹层中充注工业用 CO2 后 ,得到的真空绝热层绝热效果良好 ,能够满足一般的低温输送管路需求。

In this paper the CO 2 condensing-vacuum insulation in cryogenic transfer system using various multiple-wrap shielding and different pressure of CO 2 in vacuum space are studied. Insulating vacuum, wall temperature outside of insulated pipe and thermo conductivity are recorded and calculated. The result of this kind of vacuum insulation is satisfied and can meet the requirement of cryogenic transfer pipe.