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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

Pending Publication Date: 2021-12-17
上海跃绅能源科技有限公司 +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0010] Aiming at the problems of low recovery rate and recovery purity and large consumption of liquid nitrogen in the above-mentioned prior art, the present invention provides a method and system for recovery and purification of sulfur hexafluoride gas, aiming at high recovery purity of sulfur hexafluoride gas , and can maintain continuous production and reduce the consumption of liquid nitrogen in the case of large fluctuations in the crude sulfur hexafluoride content of raw materials

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  • Sulfur hexafluoride gas recovery and purification method and system
  • Sulfur hexafluoride gas recovery and purification method and system

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Embodiment 1

[0058] Such as 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: performing preliminary purification on the crude sulfur hexafluoride tail gas, removing solids and / or moisture and / or some gas pollutants in the crude sulfur hexafluoride tail gas, and obtaining the first intermediate product.

[0060] It is worth noting that the crude sulfur hexafluoride tail gas described in this example is used sulfur hexafluoride, and the crude sulfur hexafluoride tail gas contains more 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 concrete steps of described first ...

Embodiment 2

[0075] Basically with embodiment 1. Because the same device has a certain range requirement 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 90% sulfur hexafluoride content and 30% sulfur hexafluoride recycled gas can have a difference of more than 30° in the recovered liquefaction or solidification temperature zone. This difference will lead to a significant decrease in the recovery rate and recovery purity of the device, and a significant increase in the consumption of liquid nitrogen. In order to avoid that the tail gas with different sulfur hexafluoride content enters the solidification tank and causes the recovery rate and recovery purity of the device to drop significantly, this embodiment further adds a fourth section on the basis of Example 1. The fourth section includes :

[0076](4) The fourth section: the first hig...

Embodiment 3

[0082] It is basically the same as Example 2. Since a refrigerant needs to be set in the shell of the cold recovery device to exchange heat with the high-concentration exhaust gas after confluence, in order 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 waste gas after post-gasification must carry a part of cold energy. Therefore, in this embodiment, while the remaining gaseous pollutants with a 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 of the cold recovery device is used as a refrigerant for cold recovery, which can further greatly reduce the consumption of liquid nitrogen in the solidification section, and has the characteristics of low energy consumption, safety, and high economy.

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Abstract

The invention discloses a sulfur hexafluoride gas recovery and purification method. The sulfur hexafluoride gas recovery and purification method comprises the following steps of carrying out primary purification on crude sulfur hexafluoride tail gas to obtain a first intermediate product; performing condensation, liquefaction and liquid-gas separation on sulfur hexafluoride in the first intermediate product to correspondingly obtain a second intermediate product and first high-concentration waste gas; rectifying and purifying the sulfur hexafluoride in the second intermediate product to correspondingly obtain high-purity sulfur hexafluoride liquid and secondary high-concentration waste gas; and converging the first high-concentration waste gas and the second high-concentration waste gas, solidifying the sulfur hexafluoride in the converged high-concentration waste gas by using liquid nitrogen to obtain high-purity solid sulfur hexafluoride, and refluxing residual gas pollutants as a third intermediate product. The invention also discloses a sulfur hexafluoride gas recovery and purification system. According to the sulfur hexafluoride gas recovery and purification method, the recovery purity is high, and the consumption of the liquid nitrogen can be reduced.

Description

technical field [0001] The invention belongs to the technical field of gas recovery and purification, and more specifically relates to a method and system for recovery and purification of sulfur hexafluoride gas. Background technique [0002] With the development of my country's high-voltage and ultra-high voltage technology, SF6 (sulfur hexafluoride) gas has been widely used as an insulating medium for related high-voltage and ultra-high voltage electrical equipment. The fully enclosed switchgear using SF6 gas as insulation has the following advantages compared with conventional open high-voltage power distribution devices: (1) Small footprint; (2) Operation is not affected by external weather and environmental conditions. But sulfur hexafluoride gas also has a strong greenhouse gas effect, and its lifetime in the atmosphere is as long as 3200 years. As sulfur hexafluoride is more and more widely used in ultra-high voltage or even ultra-high voltage power systems, recyclin...

Claims

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Application Information

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IPC IPC(8): F25J3/02C01B17/45
CPCF25J3/0204F25J3/0228F25J3/0295C01B17/453Y02P20/151
Inventor 王耀亮徐银龙
Owner 上海跃绅能源科技有限公司
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