What toxic substances do sulfur hexafluoride (SF6) produce when it breaks down?- SF6在线监测系统_SF6检漏仪_SF6传感器_SF6密度继电器

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What toxic substances do sulfur hexafluoride (SF6) produce when it breaks down?

发布时间：2018-07-07 来源：ydlcb 浏览次数：29次

Pure SF6 gas is colorless, tasteless, non-toxic, non-flammable inert gas, its own decomposition temperature is greater than 500 ° C, in the normal operation of the decomposition products are very few, but when co-existing with metal materials, at 200 ° C it is possible to occur trace decomposition. As the insulating medium of gas-insulated combined electrical apparatus (GIS), sulfur hexafluoride (SF6) gas has excellent insulation and arc extinguishing performance, and can greatly reduce the size of equipment, so it is widely used in GIS and SF6 circuit breakers and other equipment. In fact, the SF6 gas in use contains a certain amount of air and water, and a variety of low fluorine sulfides generated by the above decomposition are very active, that is, react with trace water and oxygen in the SF6 gas body. Due to the combination of SF6 decomposition and water, HF.H2S.CO.SO2 and other compounds have a strong corrosion effect on other insulation and metal materials in the equipment, and then accelerate insulation deterioration, and eventually lead to sudden equipment failure. However, during the installation and operation of GIS equipment, the internal defects of GIS, such as electrode surface burrs, free conductive particles and suspended conductors, cause partial discharge or overheating.

SF6 is a non-toxic gas, and its harm to organisms is similar to nitrogen. The reason for this is that because its density is about five times that of air, organisms in the SF6 environment are in danger of asphyxiation due to hypoxic breathing. However, the toxins involved are mainly due to the impurities and water in the production and disposal process, or the decomposition formed during the arc discharge, mainly low fluoride, such as: SF2, S2F2, S2F10, SF8 and HF, and these decomposed fluoride have different degrees of toxicity.

Sulfur hexafluoride gas electrical equipment insulation materials through corona, spark and arc discharge, but also produce a variety of toxic, corrosive gases and solid decomposition products. These gases mainly include thionyl fluoride (SOF2), sulfuryl fluoride (SO2F2), sulfur tetrafluoride (SF4), sulfuryl tetrafluoride (SOF4), sulfur dioxide (SO2), disulfide decafluoride (S2F10), disulfide oxydecafluoride (S2F10O), etc. The main solid decomposition products are copper fluoride (CuF2), difluorodimethylsilicon [Si (CH3) 2 F2], aluminum trifluoride (AlF3) powder. Such as insulating parts with epoxy phenolic glass cloth plate (rod, tube) containing silicon components; Or epoxy resin castable parts, moulded parts and porcelain bottles, silicone rubber, silicone grease with quartz sand and glass as fillers play a chemical role, and also generate SiF4, Si (CH3) 2F2 and other products.

SF6, which has a strong ability to absorb infrared radiation, is a strong greenhouse gas and has been identified as a greenhouse gas that must be limited.

1. Sulfur tetrafluoride:

It has a stimulating odor similar to sulfur dioxide, which is easily hydrolyzed to form HF, etc., and can form smoke when it meets water in the air. 2. Hydrogen fluoride:

Gas with strong pungent smell, easy to melt in water, that is, hydrofluoric acid, extremely acidic, strong corrosion, can dissolve glass; It has a strong stimulating effect on the skin and mucosa, can burn the respiratory tract, can cause pulmonary edema and pulmonary inflammation.

3. Thionyl fluoride:

Has pungent odor, after hydrolysis to produce HF.

4. Sulfur decafluoride:

Colorless, tasteless and odorless, it is a highly toxic substance that mainly destroys the respiratory system and is more toxic than phosgene. Phosgene, that is, nitrous oxide, is entered by the respiratory tract, plays an exciting and paralyzing role in the nervous central system and produces tinnitus, making people in a state of arrogance, the whole body is blue, will lose consciousness due to paralysis, and severe people will die due to respiratory arrest. 5. Sulfuryl difluoride:

Colorless, tasteless, odorless gas that can cause systemic spasms, paralyze the respiratory system, and cause muscle tissue to lose function. 6. Sulfur decafluoride:

7. Thionyl tetrafluoride:

Colorless irritating gas, harmful to the lungs, and water should form SO2F2.

8. Sulfur fluoride:

A colorless, pungent gas that has a destructive effect on the respiratory system similar to phosgene.

9. Sulfur dioxide:

A gas with a pungent odor that can damage mucous membranes and respiratory systems, cause gastrointestinal disorders and fatigue, but is used in production for bleaching in an aqueous solution of sulfite.

10, sulfur difluoride: properties similar to HF.

Weavers Inspects the SF6 decomposition Analyzer (Winfoss-P11) for simultaneous detection of SO2, H2S, CO and other decomposers. Winfoss-P11 can quickly detect and determine early failures in SF6 electrical equipment (circuit breakers, transformers, transformers, GIS and bushings, etc.) in the field. The Winfoss-P11 instrument is widely used in SF6 electrical equipment in the power, railway, metallurgical and petrochemical industries. At present, electrical tests commonly used at home and abroad are generally carried out in the state of power failure, and the detection rate of insulation that endangers safety is very low. The instrument is intelligent, with high sensitivity, good stability, convenient operation, and can automatically diagnose and put forward treatment suggestions according to the detected concentration, providing a simple and effective means for the early detection of internal faults of SF6 electrical equipment.

Due to the above hazards, there are strict regulations on impurities and moisture during the production and filling of sulfur hexafluoride gas (production, filling, transportation, storage).