High-purity argon purification process and device

Abstract

The invention provides a high-purity argon purification process and device. The high-purity argon purification process comprises an adsorption process and a catalysis process. The adsorption process utilizes two adsorption towers which are arranged in parallel, wherein one adsorption tower operates while the other adsorption tower is in a standby state; the catalysis process utilizes two groups of catalytic towers and two matched electric heaters, and the catalytic tower is formed by sequentially connecting a group of two zirconium-aluminum catalytic towers and a group of two zirconium-vanadium-iron catalytic towers in series; and after raw argon having been subjected to the adsorption process is heated by an electric heater, oxygen, nitrogen, methane, hydrogen and hydrocarbon in the raw argon are initially removed through one zirconium-aluminum catalytic tower and then deeply removed through the other zirconium-vanadium-iron catalytic tower in a high-temperature state, and finally, high-purity argon meeting national standard requirements is produced. According to the invention, a zirconium-aluminum getter and a zirconium-vanadium-iron getter are respectively and independently arranged in a filling manner, so the phenomenon of getter mixing among beds in an integrated catalytic tower is eliminated, the adsorption activity of the zirconium-aluminum getter and the zirconium-vanadium-iron getter is fully utilized, the purity stability of a product is remarkably improved, production cost is reduced, and the operation cycle of the device is prolonged.

Description

technical field [0001] The invention belongs to the field of high-purity gas purification, and in particular relates to a high-purity argon gas purification process and device. Background technique [0002] High-purity gas usually uses the air separation liquid products such as liquid nitrogen and liquid argon produced by the low-temperature separation method of the air separation device as raw materials, and is further purified to reach the standard of high-purity gas. [0003] Usually high-purity gas (hereinafter referred to as high-purity gas) purification device is at normal temperature, using low-temperature liquid products such as liquid nitrogen and liquid argon as raw materials, vaporizing low-temperature liquid gas, rewarming to normal temperature, and purifying high-purity gas The raw material gas is deeply adsorbed and purified by the adsorbent and purifying agent of the purification equipment in the purification device by the adsorption method to produce high-pur...

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Problems solved by technology

The zirconium aluminum and zirconium vanadium iron getters are all loaded in a catalytic tower, and an integrated catalytic tower is heated by an electric heater. The zirconium aluminum getter and the zirconium vanadium iron getter work at the same temperature, so that The two kinds of getters cannot be at the working temperature of the best adsorption activity at the same time, resulting in the adsorption performance of the zirconium aluminum getter and the zirconium vanadium iron getter in the catalytic tower not being fully developed.

[0014] Second, in order to make the purity of argon gas exported from the purification equipment meet the national standard GB / T4842-2017 for high-purity argon gas, the actual loading amount of zirconium aluminum and zirconium vanadium iron getter in an integrated catalytic tower must be determined according to the on-site The purity, pressure and other factors of raw material gas are designed, and the getter loading calculated according to the actual design value is usually larger than the theoretical design value, so it is necessary to increase the loading volume and increase the height of the catalytic tower. The purchase cost of importing from abroad is very high, which increases the purchase cost of high-purity argon purification equipment and getter materials

At the same time, due to the increase in the filling height of the zirconium-aluminum and zirconium-iron-vanadium getters in the integrated catalytic tower, when the purification equipment is running, the electric heater heats the zirconium-aluminum and zirconium-iron-vanadium getters in the integrated catalytic tower unevenly, resulting in The purity of high-purity argon is unstable

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