High-purity sulfur hexafluoride is gaseous under normal temperature and pressure conditions, and it is easier to liquefy into liquid under constant pressure after the temperature is reduced. When the ambient temperature rises, its corresponding liquefaction pressure rises accordingly, becoming a gas that is not easy to liquefy. When the temperature exceeds 45.55℃, the critical temperature of SF6, it is liquefied by the original method.
Because high-purity sulfur hexafluoride is an inert gas, it is not compatible with oil, so the mixed oil can be separated relatively easily. Using international advanced technology, the oil filtering level has reached the level of the oil-free system, and the oil can be removed quite thoroughly.
At present, there are two main recovery and storage principles for high-purity sulfur hexafluoride recovery and charging devices in the world, one of which adopts the principle of refrigerated liquefaction: that is, in the process of SF6 gas recovery, under a fixed SF6 gas pressure, a refrigeration unit The temperature of the SF6 gas is reduced to the saturated steam temperature under this pressure, and the SF6 gas starts to be liquefied into a liquid, and is stored in a liquid form. The advantage is that the recovery speed is fast and the liquefaction speed is fast.
The other is to use the principle of high-pressure liquefaction, that is, in the process of high-purity sulfur hexafluoride recovery, at the current ambient temperature, the SF6 gas pressure is increased to the saturated vapor pressure at this temperature by the compressor, and the SF6 gas starts to be converted It is liquid and is stored in liquid form.
The advantage of sulfur hexafluoride recovery and purification device is that the system is simple, but the disadvantage is that the working pressure of the system is high and the recovery rate is low. When the temperature of SF6 gas (the temperature of SF6 gas can reach above 80℃ after being compressed by the compressor) exceeds the critical temperature of 45.55℃, It cannot be liquefied. At this time, the high-temperature and high-pressure SF6 gas can only be converted into liquid after a period of time when its temperature drops below the critical temperature.
After 50 years of development, Shuncheng Chemical Research and Design Institute Co., Ltd. has gradually formed a technology research and development center, consisting of four business sectors including chemical propellants and raw materials, new polyurethane materials, fluorine-containing gas materials, hydrogen peroxide and supporting raw materials. , With two service units of engineering design and analysis and testing, both of which are in the leading position in the same industry, and have made positive contributions to the aerospace industry, defense construction and civil economic development.
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