Pipeline pre-cooling system

Abstract

The invention provides a pipeline pre-cooling system. The pipeline pre-cooling system comprises a low-temperature storage tank, a transferring pipeline, a compressor and a pressurizing pipeline; one end of the transferring pipeline communicates with a containing cavity of the low-temperature storage tank, and the other end of the transferring pipeline is used for being connected with external equipment; the compressor is provided with an air inlet end, the air inlet end communicates with the containing cavity, and the compressor is used for compressing a gaseous first medium input from the airinlet end to form a second medium; and one end of the pressurizing pipeline is connected with the compressor, the other end of the pressurizing pipeline communicates with the transferring pipeline, and the pressurizing pipeline is used for transferring the second medium into the transferring pipeline for pre-cooling of the transferring pipeline. When the high-pressure second medium is introducedinto the transferring pipeline, the second medium can be vaporized rapidly, strong driving force is generated in the transferring pipeline to overcome the resistance caused by pipeline routes and liquid plugging in the pipelines, and thus the purpose of pre-cooling of the transferring pipeline is realized.

Description

technical field [0001] The invention relates to the field of low-temperature medium transportation, in particular to a pipeline precooling system. Background technique [0002] At present, when transporting cryogenic media by sea, such as cryogenic liquefied hydrocarbons, it is necessary to transport the cryogenic media on board to cryogenic storage tanks through unloading pipelines. When unloading low-temperature media, in order to avoid excessive stress on the pipeline caused by the low temperature of the material during unloading, the unloading pipeline must be pre-cooled before unloading. The pre-cooling operation of the unloading pipeline is directly related to the safety of the unloading system. [0003] However, in practical applications, due to the long distance between the cryogenic storage tank and the ship unloading dock, and the need to pass through multiple pipe racks with large height differences along the way, the pre-cooling process of the prior art ship unl...

AI Technical Summary

Problems solved by technology

However, the low-temperature medium will gradually vaporize during the flow of the ship unloading pipeline, and the vaporized gas accumulates at the high point of the ship unloading pipeline, forming a liquid column in the riser of the pipeline climbing section, thus forming a gas stream in the ship unloading pipeline. Alternate gas-liquid column, which increases the resistance of the low-temperature medium flow in the pipeline, so that the pre-cooling flow rate cannot be increased, which leads to poor pre-cooling operation effect

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