A rapid precooling method for low temperature medium pipeline system

Abstract

The invention relates to a pre-cooling process for a low-temperature medium pipeline, in particular to a rapid pre-cooling method for a low-temperature medium pipeline system, which is used to solve the problems of long pre-cooling time and low utilization efficiency of low-temperature medium cooling capacity existing in the prior art. However, a rapid pre-cooling method for a low temperature medium pipeline system is provided. The rapid pre-cooling method of the low-temperature medium pipeline system includes the following steps: 1) injecting low-temperature medium into the low-temperature container; 2) using high pressure and small flow mode to perform pre-cooling in the early stage; 3) switching the mode for the first time; The flow mode is pre-cooled in the middle; 5) The second mode is switched; 6) The low-pressure small flow is used for the post-cooling.

Description

technical field [0001] The invention relates to a pre-cooling process for a low-temperature medium pipeline, in particular to a rapid pre-cooling method for a low-temperature medium pipeline system. Background technique [0002] When low temperature liquid or gas flows into normal temperature pipelines and storage tanks, the huge temperature difference will cause the pipelines and tanks to shrink rapidly, and the resulting cracks may cause leakage hazards. Therefore, it is necessary to use low temperature medium to pre-cool the pipelines and storage tanks. [0003] Chinese patent CN107843434A liquid rocket engine test with low temperature and small flow pre-cooling system and pre-cooling method, the pre-cooling method steps introduced are as follows: 1) pipeline pre-cooling; 2) exhaust; 3) small flow discharge; [0004] 4) temperature judgment; 5) large flow discharge. Although the method of pre-cooling by switching between large and small flows is carried out, the residual...

AI Technical Summary

Problems solved by technology

Although pre-cooling is carried out by switching between large and small flow rates, the residual pressure of the container is not fully utilized, the consumption of low-temperature medium is still large during the pre-cooling process, and the pre-cooling time is long

[0005] Chinese patent CN110145684A is a low-temperature storage tank pre-cooling system and pre-cooling method. The pre-cooling method mentioned is natural pre-cooling. The pre-cooling medium passes through No. 1 low-temperature storage tank, No. 2 low-temperature storage tank, and No. 3 low-temperature storage tank in sequence. It seems that the cooling capacity is fully utilized, but there is no flow and pressure control requirements in the pre-cooling process, and the storage tank is cooled by natural convection heat exchange, and the pre-cooling cycle is very long

[0006] Chinese patent CN104482404A pre-cooling process of low-temperature super-large liquefied natural gas storage tank, the liquefied natural gas is sprayed into the storage tank through the spray ring on the top of the storage tank (1C) to realize spray cooling of the tank body, which improves the pre-cooling efficiency to a certain extent, but there is no Flow and pressure control requirements, large pre-cooling consumption, long pre-cooling time

[0007] Although the above existing systems and methods can achieve the purpose of pre-cooling, they all have the following disadvantages: 1) the pre-cooling time is long; 2) the cooling capacity utilization efficiency of the low-temperature medium is low

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