Sulfur hexafluoride gas recovery and purification method and system
A sulfur hexafluoride gas, sulfur hexafluoride technology, applied in chemical instruments and methods, liquefaction, sulfur compounds and other directions, can solve the problems of low recovery rate and recovery purity, large consumption of liquid nitrogen, etc., to reduce consumption and recovery High purity, avoidance of recovery rate and the effect of a significant drop in recovery purity
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[0057] Example 1
[0058] like figure 1 As shown, the present embodiment provides a method for recovering and purifying sulfur hexafluoride gas, comprising the following steps:
[0059] (1) The first section: preliminary purification of the crude sulfur hexafluoride tail gas is performed to remove solids and / or moisture and / or part of gas pollutants in the crude sulfur hexafluoride tail gas to obtain a first intermediate product.
[0060] It should be noted that the crude sulfur hexafluoride tail gas described in this embodiment is the used sulfur hexafluoride, and the crude sulfur hexafluoride tail gas contains many impurities. Specifically in this embodiment, the impurities contained in the crude sulfur hexafluoride tail gas include air, moisture, CO 2 , One or more of solid impurity particles.
[0061] In the first section, the main purpose of the first section is to remove solid impurity particles and moisture in the crude sulfur hexafluoride tail gas. The specific ste...
Example Embodiment
[0074] Example 2
[0075] Basically the same as Example 1. Since the same device has a certain range of requirements for the impurity content of crude sulfur hexafluoride, the reason is that the level of sulfur hexafluoride content determines its boiling point under a specific pressure. A bottle of recycled gas with a sulfur hexafluoride content of 90% and a recycled gas with a sulfur hexafluoride content of 30% can have a recovery liquefaction or solidification temperature zone that differs by more than 30°. This difference can lead to a substantial drop in the unit's recovery rate, recovery purity, and a significant increase in liquid nitrogen consumption. In order to prevent the tail gas with different sulfur hexafluoride content from entering the solidification tank, the recovery rate and recovery purity of the device will be greatly reduced. In this embodiment, on the basis of Example 1, a fourth section is further added, and the fourth section includes: :
[0076](4) ...
Example Embodiment
[0081] Example 3
[0082] Basically the same as Example 2. Since it is necessary to set the refrigerant in the shell layer of the cold recovery device to exchange the heat of the high-concentration exhaust gas after the confluence, so as to reduce the consumption of liquid nitrogen when the liquid nitrogen in the solidification tank is cooled; and for the solidification tank, each time the liquid nitrogen solidifies The exhaust gas after post-gasification must carry a part of the cooling capacity. Therefore, in this embodiment, while the residual gaseous pollutants with boiling point close to that of sulfur hexafluoride are returned to the first section as the third intermediate product, the gasified waste gas is also sent into the The shell layer of the cold energy recovery device is used as a refrigerant for cold energy recovery, which can further greatly reduce the consumption of liquid nitrogen in the solidification section, and has the characteristics of low energy consu...
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