Sulfur hexafluoride gas purification system

Abstract

The present invention relates to a sulfur hexafluoride gas purification system, which comprises: an alkaline washing unit filled with an alkaline medium and used for removing acidic components of a gas when sulfur hexafluoride gas is introduced; a drying unit filled with a drying medium and used for removing moisture of the gas when the sulfur hexafluoride gas is introduced, wherein the alkali washing unit is connected with the drying unit in series, the front end of the drying unit is communicated with the rear end of the alkali washing unit, the inlet of the alkali washing unit is connectedwith a gas inlet pipeline used for being connected with gas insulation electrical equipment, and the outlet of the drying unit is connected with a gas outlet pipeline used for being connected with gasextraction equipment. According to the invention, the alkaline medium in the alkaline washing unit can be subjected to an acid-alkali neutralization reaction with the acidic component in sulfur hexafluoride gas, and the drying unit is located at the downstream of the alkaline washing unit and can absorb the moisture contained in the sulfur hexafluoride gas due to neutralization reaction and / or the sulfur hexafluoride gas, so that the sulfur hexafluoride gas is purified by the alkaline washing unit and the drying unit to obtain dry and pure sulfur hexafluoride gas.

Description

technical field [0001] The invention relates to a sulfur hexafluoride gas purification system. Background technique [0002] In the power industry, sulfur hexafluoride gas is a widely used insulating medium, and has been widely used in high-voltage electrical equipment such as gas-insulated combined electrical appliances (GIS), high-voltage circuit breakers, and transmission lines (GIL). After the high-voltage switchgear is used for a long time, the water content of sulfur hexafluoride gas in the high-voltage switchgear exceeds the standard. In addition, due to the action of the high-voltage electric field and the influence of factors such as equipment fault discharge, the sulfur hexafluoride gas will decompose and produce HF, SO 2 、H 2 S, SF 2 , S 2 f 2 , SF 4 , S 2 f 10 、SOF 2 , SO 2 f 2 , S 2 f 10 O and other toxic, harmful and highly corrosive decomposition components. When repairing high-voltage switchgear and recovering gas, the acidic substances in the de...

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Problems solved by technology

When repairing high-voltage switchgear and recovering gas, the acidic substances in the decomposition products of sulfur hexafluoride gas will corrode important parts such as pipelines and compressors in the recovery device; the moisture in the gas to be recovered will combine with the decomposition products under certain conditions Hydrolysis produces H 2 SO 4 , will also cause corrosion to the recovery device, thereby affecting the service life of the recovery device, and even causing serious equipment accidents

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