Purification, separation and purification device for mixed gas of sulfur hexafluoride and nitrogen gas and sulfur hexafluoride recovery, purification and purification method

A technology of mixed gas and sulfur hexafluoride, applied in the fields of separation, sulfur hexafluoride gas recovery and purification, can solve the problems of high gas price, high liquefaction temperature, easy liquefaction, etc., achieve high economic and environmental benefits, improve gas Recovery rate, low cost effect

Pending Publication Date: 2018-08-03
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practice SF 6 Gas also has some shortcomings: (1) SF 6 It is designated as a greenhouse gas by the United Nations Environment Program, and its greenhouse effect is 23,900 times that of the equivalent carbon dioxide, and it is listed as one of the six restricted greenhouse gases by the "Kyoto Protocol"; (2) SF 6 The molecular weight is larger, the liquefaction temperature is higher than that of ordinary gases, and it is easy to liquefy under the environment of h

Method used

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  • Purification, separation and purification device for mixed gas of sulfur hexafluoride and nitrogen gas and sulfur hexafluoride recovery, purification and purification method
  • Purification, separation and purification device for mixed gas of sulfur hexafluoride and nitrogen gas and sulfur hexafluoride recovery, purification and purification method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as figure 1 As shown, a sulfur hexafluoride and nitrogen mixed gas purification, separation and purification device includes a mixed gas inlet 1, a first vacuum pump 14, a gas purification device 2, a compressor 3, a dry shell-and-tube heat exchanger 4, a liquefaction Tank 5, first cooling medium channel 6, solidification tank 7, second cooling medium channel 8, weighing device 58, liquid injection pump 10, sulfur hexafluoride filling port 11, liquid nitrogen storage tank 12 (that is, liquid nitrogen Source), nitrogen gas outlet 13, second vacuum pump 15, tail gas treatment device 16, tail gas outlet 17 and circulating purification gas storage tank 18; wherein:

[0034] The mixed gas inlet 1 is sequentially provided with a first on-off valve 20, a first pressure regulating valve 19 (the pressure regulating valve is specifically a pressure reducing valve), a second on-off valve 22, a gas purification device 2, and a third on-off valve. 23. Compressor 3, first one-w...

Embodiment 2

[0074] see figure 2 , as an improvement to Embodiment 1, in the middle of the connection between the nineteenth on-off valve 49 and the fifteenth on-off valve 44 and the connection between the twenty-fourth on-off valve 51 and the twentieth on-off valve 50 can be Add a pressure swing adsorption device 64, which is provided with Ca-A type artificial zeolite as the adsorbent in the pressure swing adsorption device 64;

[0075] The method for recovering, purifying and purifying sulfur hexafluoride of the improved scheme comprises the following steps:

[0076] Step one to step five are identical with step one to step five of embodiment 1;

[0077] 6. Recycling and purification of sulfur hexafluoride in impurity gas

[0078] After the solidification process is finished, the mixed gas in the liquefaction tank 5 and the solidification tank 7 is mainly nitrogen and a small amount of unsolidified sulfur hexafluoride saturated steam, and the fifth on-off valve 29 and the sixteenth on...

Embodiment 3

[0085] As an improvement to Embodiment 1 and Embodiment 2, the nitrogen gas outlet 13 is externally connected to a nitrogen gas recovery pipeline to recover the nitrogen gas discharged from the dry shell-and-tube heat exchanger 4 for backfilling into electrical equipment.

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Abstract

The invention provides a purification, separation and purification device for mixed gas of sulfur hexafluoride and nitrogen gas and a sulfur hexafluoride recovery, purification and purification method. A liquid outlet of a liquid nitrogen storage tank passes through a second cooling medium passage, a first cooling medium passage and a dry-type shell-and-tube heat exchanger sequentially and is connected with a nitrogen gas outlet, liquid nitrogen, as a cooling medium, flows out of the liquid nitrogen storage tank, then, passes through a solidifying tank, a liquefaction tank and the dry-type shell-and-tube heat exchanger sequentially and finally is discharged in a gas state, high-temperature gas discharged from a compressor is forcibly cooled in the dry-type shell-and-tube heat exchanger, pressurized gas SF6 can be relatively easily liquefied and then flows into the solidifying tank for low-temperature solidifying. According to the device and the method, the purification, separation andSF6 purification of SF6/N2 mixed gas are achieved, the recovery rate of SF6 is high, nitrogen gas come from the solidifying tank can be further utilized, cold energy of the liquid nitrogen is fully utilized, and the process is environmentally friendly, energy-saving and emission-reducing, so that the device and the method have extremely high economic and environmental benefits.

Description

technical field [0001] The invention belongs to the technical field of recovery, separation and purification of sulfur hexafluoride gas, and in particular relates to a device for purifying, separating and purifying mixed gas of sulfur hexafluoride and nitrogen and a method for recovering, purifying and purifying sulfur hexafluoride. Background technique [0002] Sulfur hexafluoride (SF 6 ) gas is a gas with very stable chemical properties, and is widely used in high-voltage electrical equipment because of its excellent insulating properties and arc extinguishing properties. Of the approximately 8,500 tons of sulfur hexafluoride gas produced globally each year, more than half are used in the power industry. In practice SF 6 Gas also has some shortcomings: (1) SF 6 It is designated as a greenhouse gas by the United Nations Environment Program, and its greenhouse effect is 23,900 times that of the equivalent carbon dioxide, and it is listed as one of the six restricted green...

Claims

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Application Information

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IPC IPC(8): B01D53/047C01B17/45C01B21/04
CPCB01D53/047C01B17/453C01B21/0466Y02P20/151Y02P20/10
Inventor 彭学院刘畅
Owner XI AN JIAOTONG UNIV
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