a kind of sf 6 and n 2 Device and method for rapid recovery and treatment of mixed gas

Abstract

The invention relates to a device and a method for quickly recycling an SF6 and N2 mixed gas. The device provided by the invention comprises a check valve, a drying and filtering device, an SF6 recycling device, a gas separation device and a nitrogen recycling device which are sequentially connected through a pipeline. An SF6 gas analyzer is arranged on the drying and filtering device and the gasseparation device through a pipeline; an SF6 gas detector is arranged on the nitrogen recycling device through a pipeline. The method provided by the invention comprises the steps of recycling and purifying the SF6 and N2 mixed gas; condensing and purifying an SF6 gas; separating the SF6 and N2 mixed gas; purifying and canning an N2 gas. By adopting a compression condensing separation technology and a polymer film separation technology, the recycling speed is improved, and the SF6 and N2 mixed gas is quickly recycled.

Description

technical field [0001] The present invention relates to a kind of SF 6 and N 2 The invention relates to a device and method for rapid recovery and treatment of mixed gas, belonging to the technical field of purification and treatment of mixed insulating gas in the electric power industry. Background technique [0002] Pure SF 6 (Sulfur hexafluoride) gas is a colorless, odorless, non-toxic, non-combustible gas at normal temperature and pressure. It has excellent insulating properties and arc extinguishing ability, and is an ideal insulating medium. With the rapid development of the power industry and the improvement of technical equipment, a large number of sulfur hexafluoride circuit breakers and fully enclosed combined electrical appliances have been continuously put into construction and operation, and the consumption of sulfur hexafluoride is increasing. [0003] However, SF 6 Gas also has its shortcomings in application: (1) It is sensitive to the uniformity of the e...

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Problems solved by technology

[0003] However, SF 6 Gas also has its shortcomings in application: (1) It is sensitive to the uniformity of the electric field, and its advantages can only be shown in a uniform or slightly uneven electric field; (2) SF discharged into the atmosphere 6 The gas is difficult to degrade, exists for a long time, and has a cumulative effect on global warming; (3) SF 6 The price of gas is relatively high, which increases the cost

[0006] The Chinese patent "A Separation and Purification Device for Sulfur Hexafluoride and Nitrogen Mixed Gas and a Method for Purifying and Treating the Mixed Gas" (Patent No. CN 104174249 B) provides a method for purifying and treating SF 6 and N 2 The method of mixing gases, but this method has the following disadvantages: one is to adopt the strategy of liquefaction-solidification-melt to purify SF 6 gas, underutilized SF 6 Gases are easily compressed and liquefied while N 2 It is difficult to liquefy, and a lot of energy is wasted in the heating process after cryogenic cooling; the second is SF 6 and N 2 It is difficult to completely recover SF by compressing cryogenic treatment of mixed insulating gas 6 Gas, unrecovered SF 6 gas with N 2 Discharged into the atmosphere together will cause damage to the environment

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