Argon tail gas recycling and purifying method and system

Abstract

The invention relates to an argon tail gas recycling and purifying system which comprises an argon tail gas collecting device and an argon tail gas purifying and refining device. The argon tail gas collecting device comprises a filtering unit and a pressurizing unit. The filtering unit is used for removing solid particles in the argon tail gas to obtain preliminarily filtered argon tail gas. The pressurizing unit is used for pressurizing the preliminarily filtered argon tail gas to a rated pressure to obtain pressurized argon tail gas. The argon tail gas purifying and refining device comprisesa catalysis unit, an adsorption unit, a denitrification unit and a rectification unit. The catalysis unit is used for catalyzing the pressurized argon tail gas to obtain catalyzed argon tail gas. Theadsorption unit is used for adsorbing carbon dioxide and water in the catalyzed argon tail gas to obtain adsorbed argon tail gas. The denitrification unit is used for removing part of nitrogen in theadsorbed argon tail gas to obtain denitrified argon tail gas. The rectification unit is used for rectifying the denitrified argon tail gas to obtain high-purity argon. The method and the system are easy to implement, the required cost and energy consumption are low, and the argon yield can be increased.

Description

technical field [0001] The invention belongs to the technical field of gas recovery and purification, and in particular relates to a method and system for recovery and purification of argon tail gas. Background technique [0002] As a by-product of traditional oxygen-making air separation equipment, argon's output is subject to the demand for oxygen in the market. In the market, the demand for argon is large and the demand for oxygen is small. It is impossible to add new air separation equipment to increase the production of argon, which will cause market The price of argon is extremely high, and there is a problem of market supply and demand. Therefore, how to increase argon production without adding new air separation equipment is a problem to be solved. Contents of the invention [0003] The purpose of the present invention is to provide a method for recovering and purifying argon tail gas which can increase argon production without adding new air separation equipment,...

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Problems solved by technology

[0002] As a by-product of traditional oxygen-making air separation equipment, argon's output is subject to the demand for oxygen in the market. In the market, the demand for argon is large and the demand for oxygen is small. It is impossible to add new air separation equipment to increase the production of argon, which will cause market The price of argon is extremely high, and there is a problem of market supply and demand

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