Research of the cold shield in cryogenic liquid storage

[摘要] To realize zero boil-off storage of cryogenic liquids, a cryocooler that can achieve a temperature below the boiling point temperature of the cryogenic liquid is generally needed. Taking into account that the efficiency of the cryocooler will be higher at a higher operating temperature, a novel thermal insulation system using a sandwich container filled with cryogenic liquid with a higher boiling point as a cold radiation shield between the cryogenic tank and the vacuum shield in room temperature is proposed to reduce the electricity power consumption. A two-stage cryocooler or two separate cryocoolers are adopted to condense the evaporated gas from the cold shield and the cryogenic tank. The calculation result of a 55 liter liquid hydrogen tank with a liquid nitrogen shield shows that only 14.4 W of electrical power is needed to make all the evaporated gas condensation while 121.7 W will be needed without the liquid nitrogen shield.

[发布机构] Chinese Academy of Sciences Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Beijing; 100190, China^1;University of Chinese Academy of Sciences, Beijing; 100049, China^2

[效力级别] 物理学 [学科分类] 材料科学（综合）

[关键词] Boiling-point temperature;Calculation results;Cryogenic tanks;Electrical power;Gas condensation;Liquid hydrogen tanks;Operating temperature;Thermal insulation systems