Effects of sulfur hexafluoride on atmospheric environment- 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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Effects of sulfur hexafluoride on atmospheric environment

发布时间：2015-09-23 来源：ydlcb 浏览次数：41次

In the last hundred years, the earth's climate is undergoing a significant change with global warming as the main feature. This global warming is caused by both natural climate fluctuations and the greenhouse effect, which is enhanced by human activities. Reducing greenhouse gas emissions and mitigating climate change is the main goal of the United Nations Convention on Climate Change and the Kyoto Protocol, but China is facing more and more international pressure in reducing greenhouse gas emissions. The greenhouse effect means that gases such as carbon dioxide in the atmosphere can heat up the Earth's surface through short-wave radiation from the sun. At the same time, it blocks the Earth's surface from emitting long-wave radiation into space, thus warming the atmosphere. Because this role of carbon dioxide and other gases is similar to the role of "greenhouse", it is called "greenhouse effect", and carbon dioxide and other gases are called "greenhouse gases".

At present, it is found that there are six kinds of greenhouse gases emitted by human activities, they are carbon dioxide, methane, nitrous oxide, hydrofluorocarbons, perfluorocarbons, sulfur hexafluoride, among which three kinds of fluoride. Among them, CO2 has the greatest impact on greenhouse effect, accounting for 60%, while SF6 gas only accounts for 0.1%. However, SF6 gas molecules should have potential harm to greenhouse effect, because the impact of SF6 gas molecules on greenhouse effect is 25,000 times that of CO2 molecules. At the same time, SF6 gas emitted in the atmosphere has a long life. About 3400 years. Today, about 21 billion tons of CO2 are released into the atmosphere each year, and the SF6 gas released into the atmosphere each year is equivalent to 125 million tons of CO2 gas. More than half of the approximately 8,500 tons of SF6 gas produced globally each year is now used in the power industry. In the power industry, high-voltage switchgear occupies more than 80% of the gas. The gas consumption of the medium voltage switch accounts for about 1/10; It is mainly used in 126 ~ 252kV high voltage, 330 ~ 800kV ultra-high voltage field, especially 126kV ~ 252kV ~ 550kV circuit breaker (GCB), SF6 closed combination electrical appliances (GIS), inflatable cabinet (C-GIS), SF6 gas insulated pipe bus (GIL). Therefore, reasonable and correct use and management of SF6 gas to reduce emissions is imminent!

Effects of sulfur hexafluoride on humans and animals

From a medical point of view, the degree of impact of various decomposition gases and products on the human body not only depends on the size of its toxicity, but also the size of the amount inhaled into the human body and the physical quality of each person. As an objective basis for judgment, Japan sets the allowable concentration of each animal substance to level 5. I.e. A - minimum lethal concentration; B - semi-lethal concentration (50% is the death concentration); C -- Short time residence limit, usually 15min; D - the lowest concentration at which toxic reactions occur; E -- for 8h a day, 40h a week of normal working time, most people work at this concentration, will not have adverse effects on health. As early as 1979, Shanghai First Medical College and the Institute of Occupational Disease Prevention and Control of Shanghai Chemical Industry Bureau conducted an investigation and animal tests on people engaged in or exposed to SF6 gas for a long time. In the occupational epidemiological survey of the workers of the two enterprises that produce and use SF6 gas, the workers who are similar in age, sex, labor intensity, professional service, smoking or not were grouped and compared, and no obvious harm was found to the health of the workers. However, from the point of view of the statistical incidence of symptoms, the number of people showing weakness, poor memory, sore throat, chest tightness is more.

In the group acute static exposure test and subacute static exposure test on animals (female rats and mice), the mice were placed in different concentrations of SF6 new gas or (in contact with the arc) in the gas group box. As a result, the acute static exposure test showed no abnormalities, while the subacute static exposure test showed mild submicroscopic structural changes in the pulmonary capillaries of one rat under electron microscopy. Whether it is caused by SF6 gas is difficult to determine due to the limited number of animals tested.