Sulfur hexafluoride recovery process

Abstract

The invention discloses a sulfur hexafluoride recycling process. The treatment process comprises the following steps: heating for cracking, performing multi-stage washing, performing multi-stage alkaline wash and performing pressure swing adsorption and rectification. According to the sulfur hexafluoride obtained by the recycling process disclosed by the invention, the purity of sulfur hexafluoride is larger than 99.999 percent, the industrial gas sulfur hexafluoride GB / T12022-2014 standard and gas sulfur hexafluoride GB / T18867-xxxx (draft for approval) standard in the electronic industry are met, the quality of sulfur hexafluoride in the conventional recycling technology is improved, and the application performance of sulfur hexafluoride in the electronic industry is widened.

Description

technical field [0001] The invention relates to a gas recovery and treatment process, in particular to a recovery and treatment process for sulfur hexafluoride gas. Background technique [0002] In the power industry, sulfur hexafluoride (SF 6 ) gas is widely used in the insulation and arc extinguishing of electrical equipment due to its high dielectric strength, high arc extinguishing ability and high thermal conductivity. [0003] However, at present, the purity of sulfur hexafluoride gas is insufficient, and other impurities will inevitably be produced during the operation of electrical equipment. These gas impurities are harmful to operating equipment. For example, in the presence of water vapor, SF 6 The hydrolysis reaction of the decomposition products hinders the SF 6 Recombination of decomposition products, reducing SF 6 Dielectric recovery strength, thereby reducing the insulation characteristics of the equipment; SF 6 The decomposition products will chemically ...

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Problems solved by technology

[0003] However, at present, the purity of sulfur hexafluoride gas is insufficient, and other impurities will inevitably be produced during the operation of electrical equipment. These gas impurities are harmful to operating equipment. For example, in the presence of water vapor, SF 6 The hydrolysis reaction of the decomposition products hinders the SF 6 Recombination of decomposition products, reducing SF 6 Dielectric recovery strength, thereby reducing the insulation characteristics of the equipment; SF 6 The decomposition products will chemically react with water vapor, oxygen, metal vapor and pyrolysis products of other materials in the interrupter, and the generated fluorinated sulfurous acid and hydrofluoric acid are highly toxic and will corrode electrodes and insulating materials; Fluorocarbon (C 2 f 6 、C 3 f 8 ) under high voltage, elemental carbon may be produced to form carbon on the surface of the equipment, which will cause damage to the insulation performance; sulfuryl fluoride in the gas will cause harm to the human body and the environment after entering the atmosphere

[0004] The usual practice is to periodically test the operating sulfur hexafluoride gas, replace the sulfur hexafluoride operating gas that does not meet the safety conditions for the operation of electrical equipment, and recycle the used sulfur hexafluoride gas, but the existing six The recovery and treatment capacity of the sulfur fluoride recovery and treatment system is too small, and the quality of sulfur hexafluoride gas after on-site recovery and treatment cannot meet the GB / T12022-2014 standard, and the practical performance is poor

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