Ultralow-temperature liquefied gas pressure vessel and heat insulation method

Abstract

The invention discloses an ultralow-temperature liquefied gas pressure container and a heat insulation method. The pressure container comprises an inner container, an outer container and a supporting assembly supported between the inner container and the outer container. The supporting assembly comprises a pair of supporting rings with annular hollow inner cavities and a plurality of inner supporting heat insulation pads arranged on the inner peripheries of the supporting rings at intervals in the circumferential direction and used for supporting the outer wall of the inner container. A liquid nitrogen tank is arranged on the upper portion of the outer container, a pair of liquid nitrogen circulating pipes are led out downwards from an inner liquid nitrogen area of the liquid nitrogen tank, and the pair of liquid nitrogen circulating pipes correspondingly communicate with annular hollow inner cavities of the pair of supporting rings after penetrating through the container wall of the inner container. The annular hollow inner cavities of the pair of supporting rings are filled with liquid nitrogen through a liquid nitrogen tank and a pair of liquid nitrogen circulating pipes, a liquid nitrogen communicating pipe is arranged between the annular hollow inner cavities of the pair of supporting rings, and a liquid nitrogen circulating pump is connected to one of the liquid nitrogen circulating pipes in series. The heat insulation effect of the ultralow-temperature liquefied gas pressure vessel is improved.

Description

technical field [0001] The invention relates to the technical field of pressure vessels, in particular to an ultra-low temperature liquefied gas pressure vessel and a heat insulation method. Background technique [0002] Ultra-low temperature liquefied gas storage pressure vessel is a cryogenic pressure vessel used to store ultra-low temperature liquefied gas. It adopts a double-layer structure, including an inner container and an outer container. A vacuum interlayer space is formed between the inner container and the outer container to isolate external heat. Transfer to ensure the safety of the cryogenic liquefied gas in the inner container. In order to improve the thermal insulation performance, thermal insulation materials are usually installed in the interlayer space to reduce heat conduction, convection and radiation, so as to achieve the purpose of thermal insulation and storage of cryogenic liquids. The vacuuming of the interlayer and the setting of thermal insulatio...

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Problems solved by technology

[0004] One is that the support structure between the inner container and the outer container will produce a certain amount of heat transfer, which affects the insulation effect of the ultra-low temperature liquefied gas pressure vessel

[0005] Second, although the thermal insulation materials in the mezzanine space can enhance the thermal insulation effect, the use of thermal insulation materials is still a passive thermal insulation method after all, which cannot completely eliminate heat conduction, convection, and radiation, which will also affect ultra-low temperature liquefied gas. Insulation effect of pressure vessel

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