Liquefied natural gas re-condensation device

Abstract

The invention discloses a liquefied natural gas re-condensation device. The device is mainly composed of an outer cylinder, an LNG uniform distributor, an inner cylinder and filler, and a gas-liquid mixing space is formed between the LNG uniform distributor and the inner cylinder; an opening in the upper end of the inner cylinder is welded to the inner wall of the outer cylinder through an annularouter folding edge at the lower end of the inner cylinder, an annular space is formed between the outer wall of the inner cylinder and the inner wall of the outer cylinder, the bottom of the annularspace is sealed, and the upper portion of the annular cylinder is communicated with the gas-liquid mixing space; a spiral gas lifting disc is arranged in the annular space, and the outer wall of the inner cylinder is sleeved with the spiral gas lifting disc; the spiral gas lifting disc enables the annular space to form a spiral gas lifting channel, and the lower end of the spiral gas lifting channel is communicated with a BOG bottom inlet pipe arranged at the bottom of the annular space; the upper end of the spiral gas lifting channel is communicated with the gas-liquid mixing space. The condensation efficiency of the re-condensation device is greatly improved through two times of condensation, and meanwhile, the operation stability and safety are improved.

Description

technical field [0001] The invention belongs to the technical field of liquefied natural gas (LNG) processing, in particular to a liquefied natural gas (LNG) recondensing device. Background technique [0002] The liquefied natural gas receiving station is the terminal link in the LNG industry chain. It receives liquefied natural gas from the LNG ship and transports it to downstream users after storage and regasification. In the receiving station system, due to pump operation, environmental heat leakage and unloading Displacement effects, cold insulation of equipment pipelines, etc. will cause the liquefied natural gas at extremely low temperature (-162°C) to vaporize to produce boil-off gas (BOG). [0003] The BOG recovery and treatment process at the LNG receiving station mainly includes direct compression and export, condensing into LNG through a recondenser, pressurization, gasification and export. The direct compression and export process requires downstream supporting l...

AI Technical Summary

Problems solved by technology

[0006] In order to solve technical problems such as low evaporation gas recondensation efficiency and difficult pressure control existing in the prior art, the present invention provides a liquefied natural gas recondensation device

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