A small lng supply system and its control method

Abstract

The invention discloses a small LNG supply system. The small LNG supply system comprises an LNG storage tank, a first buffer tank, a second buffer tank and a third buffer tank, the LNG storage tank comprises a storage tank body, a first partition plate is arranged in the storage tank body, the first partition plate separates the storage tank body into a first liquid storage cavity and a second liquid storage cavity, and the first liquid storage cavity is located above the second liquid storage cavity; and LNG enters the first buffer tank and the second buffer tank, the first buffer tank and the second buffer tank synchronously add the LNG into the LNG storage tank, the LNG enters a first liquid inlet cavity, the LNG enters the first liquid storage cavity through a first through hole, afterthe weight of the LNG in the first liquid inlet cavity increases to the amount to push a plugging block to move downwards, the LNG enters the second liquid inlet cavity through a first opening and then enters the second liquid storage cavity through a second through hole, and after filling the LNG storage tank, the LNG supply can be conducted through a first liquid outlet pipe and a second liquidoutlet pipe. The small LNG supply system ensures the independence, safety and reliability of gas supply and is convenient for maintenance.

Description

technical field [0001] The invention relates to an LNG supply system, in particular to a small-scale LNG supply system. Background technique [0002] With the development of my country's economy and the adjustment of energy structure, natural gas has become the main energy source on par with coal and oil, and will become one of the main energy sources in the future. Liquefied Natural Gas (hereinafter referred to as LNG) is another emerging green and clean energy after coal and petroleum. LNG is a low-temperature (-162°C) liquid mixture obtained by freezing and liquefying gaseous natural gas after desulfurization and dehydration. . Before being supplied to downstream users, LNG must be vaporized and heated above 0°C to enter the pipeline network. When LNG is vaporized, a large amount of cold energy will be released, and the cold energy released by the gasification of each ton of LNG is about 200kW·h. Recycling and utilizing this part of cold energy through specific process...

AI Technical Summary

Problems solved by technology

[0003] The current gas supply system cannot make effective use of the space in the LNG storage tank, consumes a lot of energy, and the safety performance needs to be strengthened

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