All-rectification argon extraction oxygen-enriched air separation device and process

Abstract

The invention provides an all-rectification argon extraction oxygen-enriched air separation device, and relates to the field of air separation equipment. The device comprises an air pretreatment section, a rectification section and a finished argon section; the rectification section comprises a lower tower, an upper tower, a condensation evaporator, a main heat exchanger, a supercharger/expander,a supercharged cooler and a subcooler; an oxygen-enriched liquid air outlet at the bottom of the lower tower is connected with an oxygen-enriched liquid air runner of the subcooler to divided into twoways, which are connected with an oxygen-enriched liquid air inlet of the upper tower and a liquid inlet of a rough argon condenser; liquid oxygen at the bottom of the upper tower enters the condensation evaporator, and is divided into two ways from an outlet of the condensation evaporator; one way is used as product liquid oxygen to connect with a pure liquid oxygen product conveying pipe, and the other way is connected with a liquid pump and the oxygen-enriched liquid air outlet at the bottom of the lower tower in sequence; argon distillates at the lower part of the upper tower pass througha first rough argon tower, a second rough argon tower and a finish argon tower in sequence to obtain pure liquid argon. The device has the beneficial effects of argon extraction by the oxygen-enriched air separation device, increment of the device product types and improvement of the economic benefit.

Description

technical field [0001] The invention relates to the field of cryogenic air separation equipment, in particular to a fully rectifying argon-extracting oxygen-enriched air separation device and a process. Background technique [0002] Air refers to the gas mixture in the earth's atmosphere, which is mainly composed of 78% nitrogen, 21% oxygen, 0.94% rare gases (helium, neon, argon, krypton, xenon), 0.03% carbon dioxide, 0.03% other substances ( Such as water vapor, impurities, etc.), in which the rare gas is mainly composed of argon. [0003] The air separation plant is a device that uses air as the raw material, turns the air into a liquid state through the deep freezing method of the compression cycle, and then gradually separates it from the liquid air through rectification to produce inert gases such as oxygen, nitrogen, and argon. Air separation plant is a large complex system, mainly including power system, purification system, refrigeration system, heat exchange system...

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Problems solved by technology

[0006] The refrigeration system of the existing air separation equipment consumes a large amount of electric energy due to the dew point of each gas that needs to be reached, which increases the production cost; in addition, the conventional oxygen-enriched air separation equipment can produce pure nitrogen as a by-product while obtaining enriched oxygen , liquid nitrogen, cannot produce pure oxygen or pure liquid oxygen at the same time, let alone produce argon or liquid argon at the same time

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