If the purity of sulfur hexafluoride in Liming is low, its insulation strength will be greatly reduced. It is easy to be broken down by high voltage when used in electrical insulation, resulting in accidents. It is known from the test and research results of relevant departments. What are the reasons for impure gas?

1. Liming sulfur hexafluoride is impure and contains highly toxic sulfur fluoride, hydrogen fluoride and other toxic gases. As you know, at present, the chemical industry mainly manufactures sulfur hexafluoride by direct combination of elemental sulfur and excess gaseous fluorine; That is, S+3F2 → SF6+Q (heat released). The crude product contains a variety of impurities. The composition and content of impurities vary greatly due to the purity of raw materials, the materials of production equipment, process conditions and other factors. The total content of impurities can reach 5%. In addition to the impurities generated in the above synthesis process.

In addition, a small amount of air, water, mineral oil and other impurities may be mixed in the gas filling process, which carry or produce certain toxic substances. Therefore, in order to ensure the purity and quality of sulfur hexafluoride at Liming, the International Electrotechnical Commission (IEC) of sulfur hexafluoride and many countries have formulated quality standards for the outgoing sulfur hexafluoride, and the manufacturer is required to provide the non-toxic certificate of biological test when supplying.

Or the decomposition product of sulfur hexafluoride at dawn in electrical equipment reacts with the water in it to produce some toxic products. For example, the secondary reaction between SF6 gas decomposition products and water generates hydrofluoric acid, sulfur dioxide, sulfuric acid, etc.

Liming sulfur hexafluoride and decomposition products in electrical equipment react with insulating materials to generate some toxic products. For example, insulating parts such as epoxy phenolic glass fiber cloth board (rod, tube) containing silicon; Or epoxy resin casting parts, molded parts, porcelain bottles, silicone rubber, silicone grease, etc. filled with quartz sand and glass play a chemical role to generate SiF4, Si (CH3) 2F2 and other products.

The above products of high temperature decomposition of sulfur hexafluoride gas will lead to the problem of impurity of sulfur hexafluoride gas. When we purchase, we should first avoid it. We should find a regular manufacturer to purchase and attach a product test report. In addition, sulfur hexafluoride gas in the equipment shall also be detected and replaced frequently to avoid damage to the equipment.

The content of the article comes from Liming sulfur hexafluoride: http://www.feiliergas.com