Method for measuring and calculating relationship between vacuum degree of low-temperature gas cylinder and daily evaporation rate and adsorption capacity

Abstract

The invention discloses a method for measuring and calculating the relationship between the vacuum degree of a low-temperature gas cylinder and the daily evaporation rate and the adsorption capacity.The method comprises the following steps: (1) preparing a measuring device; (2) measuring and calculating the basic values of the background interlayer vacuum degree and the static daily evaporation rate of the low-temperature gas cylinder into which the low-temperature liquid is injected; (3) filling the interlayer of the low-temperature gas cylinder with trace gas for multiple times to reduce the vacuum degree of the interlayer of the low-temperature gas cylinder, and measuring and calculating the vacuum degree, the static daily evaporation rate and the adsorption capacity of the interlayerof the low-temperature gas cylinder after the gas is filled each time; (4) drawing a change relation curve of the interlayer vacuum degree and the static daily evaporation rate according to the recorded interlayer vacuum degree and the static daily evaporation rate; and drawing an actual adsorption isotherm according to the recorded interlayer vacuum degree after each time of inflation and the corresponding adsorption capacity. According to the measuring and calculating method, the change relation between the vacuum degree of the interlayer of the low-temperature gas cylinder after gas leakageand deflation and the static daily evaporation rate and the adsorption capacity can be measured and calculated, and the change relation can be shown through a drawn curve.

Description

technical field [0001] The invention relates to the field of low-temperature gas cylinders for storing low-temperature liquids, in particular to a method for measuring and calculating the relationship between the vacuum degree of low-temperature gas cylinders, daily evaporation rate and adsorption capacity. Background technique [0002] A cryogenic gas cylinder is a vacuum insulated container for storing and transporting cryogenic liquids, such as liquid hydrogen, liquid nitrogen, liquid oxygen, liquid argon, and liquefied natural gas. The cryogenic gas cylinder has an outer cylinder and an inner cylinder located in the outer cylinder. The cylinder, the interlayer between the inner and outer cylinders is a vacuum insulation layer, and an adsorbent for absorbing gas is placed in the interlayer to maintain the vacuum; the vacuum degree of the cryogenic gas cylinder refers to the vacuum degree of the interlayer of the cryogenic gas cylinder. The service life of the bottle is cl...

AI Technical Summary

Problems solved by technology

[0004] Now due to the lack of air leakage or the relationship between the vacuum degree of the interlayer of the cryogenic gas cylinder and the adsorption capacity after the material is deflated, and the relationship between the vacuum degree of the interlayer and the static daily evaporation rate, the vacuum life of the interlayer of the cryogenic gas cylinder after the air leakage or the material is deflated Duration is difficult to assess

Images