Methane recovery system and recovery method

Abstract

The invention relates to a methane recovery system and recovery method, the system includes a heat exchange device for receiving methane gas, the heat exchange device includes at least two channels, wherein the inlet of the first channel is connected with the gas outlet of the gas-liquid separation device , the outlet of the first passage is connected with the inlet of the compression device, the inlet of the second passage is connected with the outlet of the compression device, and the outlet of the second passage is connected with the inlet of the gas-liquid separation device through a throttling and stabilizing device, so A cut-off valve is provided between the liquid outlet of the gas-liquid separation device and the inlet of the liquid storage tank, and the liquid storage tank is provided with a booster port, and the booster port is connected to the heat exchange device through the booster valve. The outlet of the second passage is connected, and the cut-off valve and the boost valve control the liquid discharge of the liquid storage tank. The liquid production system and the liquid discharge system of the invention operate separately, and at the same time, the safety of the process and the recovery efficiency are realized through the control means.

Description

technical field [0001] The invention relates to the technical field of gas recovery and reuse, in particular to the recovery of boil-off gas (BOG) applied in the storage and transportation of liquefied natural gas (LNG). Background technique [0002] The main component of liquefied natural gas (LNG) is methane. It is recognized as the cleanest energy source on earth. It is colorless, odorless, non-toxic and non-corrosive. Its volume is about 1 / 625 of the volume of the same amount of gaseous natural gas. The weight of LNG Only about 45% of the same volume of water. Liquefied natural gas is natural gas that becomes liquid after being compressed and cooled to its boiling point. Usually, liquefied natural gas is stored in a low-temperature storage tank at minus 161.5 degrees Celsius and about 0.1 MPa. It is transported by special ships or tank trucks and re-gasified when used. . The burning of liquefied natural gas causes very little air pollution and releases a lot of heat, s...

AI Technical Summary

Problems solved by technology

[0005] For this reason, the technical problem to be solved by the present invention is to overcome the problem of low recovery efficiency when recovering and releasing methane in the prior art so as to provide a methane recovery system that can not only improve the recovery rate, but also make the liquid production system and the liquid discharge system run independently and smoothly. System and recovery method

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