Low-temperature storage tank pre-cooling system and pre-cooling method

Abstract

The invention discloses a low temperature storage tank pre-cooling system. The low temperature storage tank pre-cooling system comprises a low temperature storage tank No. 1, a low temperature storagetank No. 2, a low temperature storage tank No. 3, a pre-cooling main pipe and a gas phase external transportation main pipe, wherein a pre-cooling main pipe valve is arranged on the pre-cooling mainpipe; and a gas phase external transportation main pipe valve is arranged on the gas phase external transportation main pipe. The low temperature storage tank pre-cooling system has the beneficial effects that the low temperature storage tank pre-cooling system is simple and convenient to operate; the utilization rate of the cold energy of a liquid phase low temperature medium is high; the pre-cooling efficiency is high; the problem that when a low temperature storage tank is pre-cooled, the cold energy is largely wasted, and the pre-cooling cost is high, is solved; meanwhile the efficiency ofsimultaneously pre-cooling multiple low temperature storage tanks in a tank field is improved; the pre-cooling time is saved; and the investment of owners in the pre-cooling of the storage tanks is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of low-temperature storage tanks, in particular to a low-temperature storage tank pre-cooling system and a pre-cooling method. Background technique [0002] More and more cryogenic storage tanks are used in the energy and petrochemical industries. Most of these cryogenic storage tanks adopt a double-layer structure, and glass bricks, expanded perlite and glass wool are used as thermal insulation and cold insulation materials between the inner tank and the outer tank. After the construction and installation of the storage tank is completed, before the material is put into operation, it is necessary to pre-cool the inner tank of the storage tank with a liquid-phase low-temperature medium to ensure that the inner tank can shrink evenly from normal temperature to low temperature, and reduce the deformation and deformation caused by the uneven cooling of the storage tank. Risk of tank breakage due to excessive th...

AI Technical Summary

Problems solved by technology

Due to the large volume of the current low-temperature storage tanks and the low design pressure, the vaporization of the liquid-phase low-temperature medium during pre-cooling will cause the pressure of the gas phase to rise. In order to avoid overpressure, it is necessary to exhaust, and while exhausting, It also takes away the cooling capacity in the storage tank, resulting in the amount of liquid-phase low-temperature pre-cooling medium required for pre-cooling the storage tank much higher than the calculated amount

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