Influence of Vacuum Failure on Heat-Insulating Property of Cryogenic Vessels

doi:10.12141/j.issn.1000-565X.210668

Abstract

Abstract:

Aiming at the vacuum failure of high-vacuum multilayer insulated cryogenic vessel, this paper established a mathematical model for calculating the heat transfer of the annular space with different vacuum failure degrees. A test platform on the vacuum failure insulation performance of cryogenic vessels was built up. The experiment used dry nitrogen as leaking gas to fill the annular space of a 120 L cryogenic vessel with 50% initial filling rate. The boil-off gas, pressure and temperature variations were analyzed when the vacuum degrees of annular space were 10^-3, 1, 10², and 10³ Pa. The results were verified by theoretical calculation. The result shows that the pressure rise rate, boil-off gas and the temperature of ullage in the inner vessels increase with the decrease of vacuum degree of annular space. When the vacuum degree is 10³ Pa, the heat flow density of the cryogenic vessel is 1.32, 12.96, and 122.21 times of that in 10², 1 and 10^-3 Pa, respectively. The maximum boil-off gas is 2.15, 9.69 and 13.77 times of that in 10², 1 and 10^-3 Pa, respectively. With the decrease of the annular space of vacuum degree, the potential safety hazards of cryogenic vessels are gradually aggravated.

Key words: cryogenic vessel, vacuum failure, pressure rise rate, boil-off gas

CLC Number:

TB658

CHEN Shuping, SHI Shunbao, ZHU Ming, et al. Influence of Vacuum Failure on Heat-Insulating Property of Cryogenic Vessels[J]. Journal of South China University of Technology(Natural Science Edition), 2022, 50(7): 136-143.

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名称	型号	测量范围	精度/%
气体流量计	AK-TGMFM	0.01~60 Nm³/h	±1.0~2.5
超低温压力变送器	PPM-T222E	0.0~0.5 MPa	±2
铂电阻温度传感器	PT-100	73~773 K	±0.15
无纸记录仪	RX-6000 F

真空度/Pa	稳定排放量/（m³·h^-1）	最大排放量/（m³·h^-1）	最大排放量与初始时刻的比值
10^-3	0.13	0.14	1.00
1	0.22	0.28	2.15
10²	1.17	1.26	9.69
10³	1.60	1.79	13.77