Method for purifying sulfur hexafluoride and purifying and solidifying tank of sulfur hexafluoride

Abstract

The invention relates to a method for purifying sulfur hexafluoride and a purifying and solidifying tank of the sulfur hexafluoride. The method includes: sucking the sulfur hexafluoride into a sulfur hexafluoride catabolite filtering air chamber through a compressor, adsorbing water, catabolite and toxic substances in the sulfur hexafluoride through special adsorbents, pressurizing and refrigerating the sulfur hexafluoride to liquefy the sulfur hexafluoride, enabling the liquefied sulfur hexafluoride to enter the solidifying tank, further cooling the sulfur hexafluoride through liquid nitrogen, and extracting foreign gases through a vacuumizing device when the temperature is lower than the solidifying point of the sulfur hexafluoride, wherein at this time, the sulfur hexafluoride is solidified, and impurity gases such as the air and carbon dioxide are still gases. The solidified sulfur hexafluoride melts when a heating device is started, and high-purity liquid sulfur hexafluoride is obtained, the liquid sulfur hexafluoride can be pumped out from a liquid outlet by utilizing a special compression mechanism and can be refilled or filled into a steel cylinder. The method for purifying sulfur hexafluoride and the purifying method have the advantages that the treatment efficiency is high, the treated gas is high in purity, the tail gas is free of pollution and the like.

Description

technical field [0001] The invention belongs to the technical field of sulfur hexafluoride gas treatment, in particular to a method and equipment for purifying sulfur hexafluoride gas. Background technique [0002] At present, the purification of sulfur hexafluoride gas in the market mainly includes pressure swing adsorption, membrane separation, liquefaction or their combination, which is mainly aimed at directly purifying sulfur hexafluoride in the high-voltage switch. These methods in the current market, It is inevitable that there are problems such as low processing speed, small processing capacity, complicated process, etc., and mainly imported products have high prices. [0003] For example, in the currently commonly used liquefaction treatment methods, after gas-liquid separation, the sulfur hexafluoride in the mixed gas is saturated steam, and the content of sulfur hexafluoride is relatively high. It cannot be discharged into the atmosphere without treatment, otherwi...

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Problems solved by technology

[0002] At present, the purification of sulfur hexafluoride gas in the market mainly includes pressure swing adsorption, membrane separation, liquefaction or their combination, which is mainly aimed at directly purifying sulfur hexafluoride in the high-voltage switch. These methods in the current market, It is inevitable that there are problems such as low processing speed, small processing capacity, and complicated process, and mainly imported products with high prices

[0003] For example, in the currently commonly used liquefaction treatment methods, after gas-liquid separation, the sulfur hexafluoride in the mixed gas is saturated steam, and the content of sulfur hexafluoride is relatively high. It cannot be discharged into the atmosphere without treatment, otherwise it will not only waste gas but also cause environmental pollution

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