Sulfur hexafluoride gas has electrical insulating properties, and the electrical insulating ability is about 2.5 times that of air and nitrogen. Sulfur hexafluoride gas has good arc extinguishing performance, its arc extinguishing ability is about 100 times that of air, and the chemical properties of sulfur hexafluoride are very stable, so sulfur hexafluoride is widely used as insulating gas, such as hexafluoride Sulfur hexafluoride relay, sulfur hexafluoride high voltage circuit breaker, sulfur hexafluoride mutual conductivity sensor, sulfur hexafluoride lightning rod and so on. Sulfur hexafluoride has become a new generation of insulating medium with good insulation and high voltage resistance after insulating oil.
Pure sulfur hexafluoride (SF6) is a non-toxic and odorless gas. The specific gravity of sulfur hexafluoride gas is higher than that of air. After leakage, it sinks to the lower layer and is not easy to volatilize. After being inhaled by the human body, it will accumulate in the lungs for a long time. Unable to discharge, resulting in reduced lung capacity, serious adverse consequences such as breathing difficulties and suffocation. In view of the harm caused by the leakage of Sf6 sulfur hexafluoride gas to the human body, please pay attention to the following points
1. Sulfur hexafluoride is a suffocating agent, which can cause breathing difficulties, wheezing, blue skin and mucous membranes, and generalized convulsions in high concentrations. After inhaling a mixture of 80% sulfur hexafluoride + 20% oxygen for a few minutes, the human body will experience numbness in the limbs, and even suffocate to death.
2. Decomposition products of sulfur hexafluoride gas under the action of arc such as sulfur tetrafluoride, sulfur fluoride, sulfur difluoride, thionyl fluoride, sulfuryl difluoride, tetrafluorothionyl and hydrofluoric acid, etc. , they are both highly corrosive and toxic.
1. Sulfur tetrafluoride: It is a colorless gas at room temperature with a pungent odor. It can form smog with moisture in the air, which is harmful to the lungs and affects the respiratory system. Its toxicity is comparable to that of phosgene.
2. Sulfur fluoride: It is a colorless gas at room temperature, poisonous, has a pungent odor, and has a similar destructive effect on the respiratory system as phosgene.
3. Sulfur difluoride: The chemical properties are extremely unstable, and the performance is more active after being heated, and it is easily hydrolyzed into sulfur, sulfur dioxide and hydrofluoric acid.
4. Thionyl fluoride: It is a colorless gas with the smell of rotten eggs, with stable chemical properties. It is a highly toxic gas, which can cause severe pulmonary edema and suffocate animals to death.
5. Sulfuryl difluoride: It is a colorless and odorless gas with extremely stable chemical properties. It is a poisonous gas that can cause convulsions. Its danger is that it has no pungent smell and will not cause irritation to the nasal mucosa, so it often leads to rapid death after poisoning.
6. Tetrafluorothionyl: It is a colorless gas with a pungent odor, which is harmful to the lungs.
7. Hydrofluoric acid: It is the most corrosive substance in acid. It has a strong stimulating effect on the skin and mucous membranes, and can cause pulmonary edema and pneumonia.
Emergency treatment of Sf6 sulfur hexafluoride gas leakage: quickly evacuate personnel from the leaked contaminated area to the upper wind, and isolate and strictly restrict access. It is recommended that emergency responders wear self-contained positive pressure breathing apparatus and general work clothes. Cut off sources of leaks as much as possible. Reasonable ventilation, accelerate the diffusion. Use immediately if possible. The leaking container should be properly handled, repaired and inspected before use.