Full liquid-air separation unit using liquefied natural gas cold energy and method thereof

Abstract

The invention relates to a full liquid-air separation unit using liquefied natural gas cold energy and a method thereof. The full liquid-air separation unit comprises a self-cleaning air filter AF, an air compressor TC1, an air cooler E5, a purification system, a main heat exchanger E2, a liquefier E7, a lower tower C1, an upper tower C2 communicated with the lower tower C1 through a pipe and a subcooler E3, a first condensation evaporator K1, a nitrogen circulating system and an argon fractionation system, wherein, the lower tower C1 is equipped with a liquid nitrogen fraction extraction opening and a barren liquor-air extraction opening; the subcooler E3 is equipped with a liquid nitrogen fraction channel and a barren liquor-air channel; the upper tower C2 is equipped with a liquid nitrogen fraction inlet and a barren liquor-air inlet; the liquid nitrogen fraction channel is respectively communicated with the upper tower C2 and the lower tower C1 through the subcooler E3; and the barren liquor-air channel is respectively communicated with the upper tower C2 and the lower tower C1 through the subcooler E3. The invention has high utilization ratio of refrigerating capacity, energy conservation, environmental protection, high operating efficiency and high safety factor.

Description

technical field [0001] The invention relates to an air separation device, in particular to an all-liquid air separation device and method utilizing the cold energy of liquefied natural gas. Background technique [0002] Air separation equipment is a gas separation equipment that liquefies, rectifies, and finally separates air into oxygen, nitrogen and other useful gases, referred to as air separation equipment. Air was once called "permanent gas". By the end of the 19th century, it was discovered that air could also be liquefied at deep low temperatures, and oxygen and nitrogen could be separated from liquefied air due to the different boiling points of oxygen and nitrogen. The first commercial oxygen concentrator was made in 1903, and it was originally only used for gas welding and cutting of metals. At the end of the 1930s, the nitrogen fertilizer industry needed nitrogen, and the oxygen generator was developed to produce oxygen and nitrogen at the same time, which was re...

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Problems solved by technology

[0004] The liquid oxygen, liquid nitrogen and liquid argon products produced by the full liquid air separation plant are widely used in metallurgy, petrochemical, machinery, chemical fertilizer, glass, military industry, food, medical treatment and other fields, but the traditional conventional air separation consumes a lot of energy, and the production of 1Nm 3 Liquid products require 1.05-1.25kwh of energy consumption, and the air separation unit using LNG cold energy produces 1Nm 3 Energy consumption of liquid products is reduced by more than 50%

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