Device used for purifying liquid argon and method

Abstract

The invention discloses a device used for purifying liquid argon and a method. The device comprises a liquid argon purification tower system, a heat exchange system, a heat source supply system, a cooling capacity supplement system and a waste liquid recovery system. The method comprises the steps that unqualified low-purity liquid argon is led out from a pure argon tower and fed into the liquid argon purification tower system to be rectified, high-purity liquid argon is obtained, gas from the heat source supply system is cooled by the heat exchange system and then enters the liquid argon purification tower system to serve as a heat source, the gas is condensed and then cooled by the heat exchange system and then enters the liquid argon purification tower system to serve as a cold source, and the part with insufficient cold capacity is supplied by the cooling capacity supplement system, waste liquid enters a circulating liquid oxygen pump inlet of original main air separation equipment to be recycled, and the gas enters the heat source supply system through the heat exchange system to be compressed. According to the device, systems are highly coupled, the device is suitable for further purification of liquid argon with different purities, the application range is wide, the overall economic benefit is improved, meanwhile, the device is arranged outside the original main air separation equipment, the influence on modification of the original main air separation equipment is small, the operation is flexible, and replicability is high.

Description

technical field [0001] The invention relates to gas separation technology. Specifically, a low-purity liquid argon is purified into high-purity liquid argon by using a low-temperature rectification method to design a device and method for purifying liquid argon, which belongs to the field of low-temperature technology. Background technique [0002] Argon is a rare gas with very inactive chemical properties. It is widely used in aircraft manufacturing, shipbuilding, atomic energy industry and machinery industry. Because it can neither burn nor support combustion, it is often used as a special metal, such as aluminum, magnesium, Shielding gas for welding copper and its alloys and stainless steel to prevent the welded parts from being oxidized or nitrided by air. [0003] In recent years, with the development of social economy and the progress of industrial technology, the market demand for high-purity argon is also increasing. For example, argon used in the electronic industry...

AI Technical Summary

Problems solved by technology

However, due to various reasons in some air separation equipment, the purity of the liquid argon produced from the cold box of the air separation equipment is low (the oxygen content is greater than 1ppm), which cannot meet the technical requirements for high-purity liquid argon, and the economic benefits have been greatly limited. ; At the same time, the operation requirements of "safe, stable, long, full, and excellent" for air separation equipment will not give air separation equipment operators a long time for transformation, and they can achieve higher efficiency while minimizing the impact on the original main air separation equipment. Pure liquid argon has become the choice of many manufacturers

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