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What are the hazards of sulfur hexafluoride?

Author:Winfoss Seeker Technology (Shanghai) Co., Ltd.Release time: 2018-05-17 Browsing

Sulphur hexafluoride (SF6) is a colorless, odorless, odorless, non-toxic inert non-flammable gas. Pure sulfur hexafluoride gas is non-toxic, but it cannot sustain life. Sulphur hexafluoride is a simple suffocation agent. Exposure to the atmosphere containing less than 19.5% oxygen can cause dizziness, coma, increased saliva, unresponsiveness, nausea, vomiting, loss of consciousness, and even death. Exposure to the atmosphere with an oxygen content of less than 12% will lose consciousness without any aura and lose the ability to rescue itself. In the course of its production or under the action of high-energy factors, it will decompose to produce several toxic or even highly toxic, corrosive and harmful substances, such as SF4, SOF2, SF2, SO2F2, HF, etc. are all highly toxic and corrosive compounds. The human body is extremely hazardous. SF6 gas molecules are potentially harmful to the greenhouse effect because the effect of one molecule, SF6, on the greenhouse effect is equivalent to that of 23,900 CO2 molecules, and CO2 gas can be converted into oxygen by the photosynthesis of plants and released into the atmosphere. The SF6 gas emitted in the atmosphere can neither be decomposed nor converted, leading to a long survival life in the atmosphere of about 3200 years. Today, about 21 billion CO2 gases are emitted into the atmosphere every year, and SF6 gas emitted into the atmosphere each year is equivalent to 125 million tons of CO2 gas. Therefore, the impact of SF6 on the greenhouse effect is enormous.

Sulfur hexafluoride gas is also an important greenhouse effect gas. Its single-molecule greenhouse effect is 23,900 times that of CO2. It is one of the six greenhouse gases that are banned from being emitted under the Kyoto Protocol. The hazard of sulfur hexafluoride is due to the strong radiation ability of SF6 gas absorbing infrared rays (absorbing large amounts of surface heat and low-level radiant heat). The global warming potential of sulfur hexafluoride is 22,800 times that of carbon dioxide, that is, the greenhouse effect caused by the emission of 1 kg of SF6 into the atmosphere, which is equivalent to the effect of 22.8 metric tons of CO2 emissions; how serious is the global warming brought by CO2, In triggering climate warming, the hazard of sulfur hexafluoride can not be ignored!

The greenhouse effect of sulfur hexafluoride is the main point of the hazard of sulfur hexafluoride. In addition, the decomposition of SF6 is also one of the causes of the hazard of sulfur hexafluoride. Although pure SF6 gas is chemically stable, safe and non-toxic, under the effect of high temperature and high pressure arc, if there is excessive moisture, it may decompose hydrofluoric acid (HF) and toxic SOF2, SO2F2, SF4 and SOF4. Such low-cost sulphur fluorides, under the action of high-temperature arcing, will also decompose and produce one of the greenhouse gases, sulphur dioxide (SO2) and hydrofluoric acid (HF). These toxic gases will not only corrode the equipment itself, but will cause serious harm to the human body in the event of a leak; the toxic decomposition of SF6 is also a hazard of sulfur hexafluoride.

According to statistics, the annual demand for gas in the domestic power industry is around 8,000 tons. According to the statistics of the annual abandonment rate of 10%, the amount of emissions is equivalent to 20 million tons of CO2 gas. With the rapid development of the electric power industry and the increase in the level of technological equipment, gas demand has rapidly increased.

Due to sulfur hexafluoride gas easily decomposes with oxygen and moisture under the action of arc, many toxic and corrosive substances such as sulfur tetrafluoride, hydrofluoric acid and sulfur dioxide are produced. These decomposers are used for high pressure equipment and human body. There are different degrees of safety hazards.

Although China has issued a series of standards and procedures for the production, management, and application of SF6 gas, such as "Sulfur hexafluoride electrical equipment in gas management and testing guidelines", "High-voltage switchgear sulfur hexafluoride gas sealing test "Guidelines", "Detailed Safety Regulations for SF6 Electrical Equipment Operation, Test, and Repair Personnel", but lack of awareness of the greenhouse gas effect of SF6 gas by maintenance personnel, coupled with the lack of on-site purification equipment and hexafluoride The use of sulphur in the management of chaos and other reasons, the maintenance of sulfur hexafluoride gas emissions from time to time.

According to reports, although there are so-called purification functions in the current market for recharging and recharging equipment, there are problems such as slow recovery speed, large gas loss, oil content, gas quality that cannot be guaranteed, and storage in a warehouse after recycling. At the same time, China's standards for the requirements of the gas back to the body compared to the state, according to introduction, with a small gas treatment system and the detection room purification treatment center project can meet the development needs of China's electricity market, so that the use of sulfur hexafluoride gas to achieve a true meaning of recycling . The sulfur hexafluoride gas is recovered, and the used sf6 gas is purified to meet the national standard.