Low-temperature liquid storage tank vacuum interlayer pearlife filling technology

Abstract

The invention discloses a low-temperature liquid storage tank vacuum interlayer pearlife filling technology. By virtue of the negative pressure, a low-temperature container vacuum interlayer is filled with pearlife; then the flow resistance of the pearlife in the vacuum interlayer is overcome by use of positive pressure, so that the purpose of compaction is achieved. The filling technology has the characteristics of being simple and convenient in technical operation and high in filling efficiency, and filling is performed under a seal state isolated from air and water; by virtue of a filling, compaction and repetitive filling and compaction process, the vacuum interlayer is seamlessly filled with the pearlife, so that the insulation performance and service life of a storage tank are ensured.

Description

technical field [0001] The invention relates to a vacuum interlayer pearlescent sand filling process for a cryogenic liquid storage tank. Background technique [0002] Due to the particularity of cryogenic liquids, cryogenic containers containing cryogenic liquids must have good low-temperature thermal insulation performance, and the low-temperature thermal insulation of fixed cryogenic liquid storage tanks mainly relies on the interlayer (vacuum) filled with thermal insulating materials—expanded perlite (pearlite) to fulfill. The filling rate of the thermal insulation material determines the service effect and life of this type of container to a large extent. The filling of thermal insulation materials has the following difficulties: [0003] (1) Expanded perlite is highly susceptible to air, water, and other pollution, which will directly affect the low-temperature insulation effect of thermal insulation materials and the vacuum degree of subsequent interlayer sealing. ...

AI Technical Summary

Problems solved by technology

[0004]⑵ Uncompacted pearlite, low temperature heat insulation effect will be discounted

[0005]⑶ It is also very difficult to fill the interlayer of the container with pearlite without gaps. Manually cannot control the flow of pearlite in the interlayer, and it is easy to produce voids during the filling process. Holes will reduce the thermal insulation performance of the storage tank; the surface will sweat and frost, and the thermal insulation performance will deteriorate; and the left and right ribs may form accumulations

[0007] (1) The load of pumping down is high

[0009]⑵ Low filling efficiency

[0010] During the filling process of pearlite, when the pearlite is filled to a certain amount, the fluidity of pearlite becomes slower and the filling efficiency is low

[0011]⑶ The filling density cannot be guaranteed

[0012] During the pearlite sand filling process, when the pearlite sand is filled to a certain amount, the pearlite sand will be filled to a certain extent only through the suction and vibration of the vacuum unit. Difficulty, after the storage tank is used in the factory, the settlement of pearlite will affect the thermal insulation performance

[0013]⑷ Unable to completely fill the mezzanine space

[0014] During the filling process of traditional pearlite sand filling, when the pearlite sand is filled to a certain amount, it is easy to generate cavities, which are inside the interlayer and cannot be controlled manually , which has a direct impact on the thermal insulation performance and service life of the storage tank

[0015]⑸ High material and processing costs

[0016]Each filling port is equipped with a forged flange cover, and the cost of materials and processing costs are higher than those after improvement

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