A kind of treatment method of sulfur hexafluoride waste gas

A technology of sulfur hexafluoride and treatment methods, which is applied in the fields of chemical instruments and methods, separation methods, perfluorocarbon/hydrofluorocarbon capture, etc. Problems such as high temperature

Active Publication Date: 2021-09-14
STATE GRID HUNAN ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method still has the following defects: the first, the reactivity of the defluorinating agent and the decomposition rate of sulfur hexafluoride and the reaction speed are relatively slow and need 1 hour of reaction time, which is not conducive to the real-time processing of gas; the second, the required The reaction temperature is relatively high (750-850°C), so the energy consumption is relatively high, which is not convenient for on-site implementation
[0005] Chinese utility model patent CN 207628186 U discloses "a sulfur hexafluoride separator and a sulfur hexafluoride separation device with it", which uses fiber materials to separate sulfur hexafluoride and air, and does not further explain the separation effect , the subsequent treatment process is also more cumbersome

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Defluorination agent is a molecular sieve, silica fume modified medium mixture (1: 2, by mass ratio). Modified mesoporous molecular sieves made from MCM-41, which is modified following steps: 1) preparation of NaF concentration 0.5mol / L and Mg (NO 3 ) 2 At a concentration of 1mol / L aqueous solution of a modified; MCM-41 modified with raw powder after the solution 2) and then mixed in a ratio mode to 50mL per gram, the resulting suspension was stirred at 70 ℃ for 48 hours, pumping filter; 3) of the suction filter cake obtained an oven, and dried at 110 deg.] C 12h, and put 3h muffle furnace firing at 400 ℃, i.e., ground to a powder of modified mesoporous molecular sieve. Sulfur hexafluoride concentration of 2000ppm air to 600mL / min through the membrane separator containing PDMS membrane module was concentrated, membrane pressure of 0.6MPa, a membrane area of ​​0.5m 2 , The air flux was 2930g · h -1 · M -2 , Using 2-stage membrane, the concentrated sulfur hexafluoride p...

Embodiment 2

[0026] Defluorination agent is a molecular sieve, silica fume modified medium mixture (1: 3 mass ratio). Modified mesoporous silica SBA-15 is made, which modified the following steps: 1) Preparation of KF concentration 1mol / L and Ca (NO 3 ) 2 Concentration of 2mol / L aqueous solution of a modified; 2) SBA-15 and then to mold the raw powder and the modified aqueous solution mixed in a ratio of 100mL per gram, the resulting suspension was stirred at 70 ℃ for 48 hours, pumping filter; 3) of the suction filter cake obtained an oven, and dried at 110 deg.] C 12h, 5h and put muffle furnace firing at 500 ℃, i.e., ground to a powder of modified mesoporous molecular sieve. Sulfur hexafluoride concentration of 1000ppm of air through the membrane of the membrane separator containing PMP was concentrated, membrane pressure of 0.5MPa, a membrane area of ​​0.6m 2 , The air flux was 2650g · h -1 · M -2 , Use of two membrane modules, sulfur hexafluoride concentration after concentrated to 98.2...

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PUM

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Abstract

The invention discloses a treatment method for sulfur hexafluoride waste gas, which comprises the following steps: 1) passing the sulfur hexafluoride waste gas into a reaction column containing a defluorination agent, performing sulfur hexafluoride cracking reaction, and obtaining reaction tail gas; Wherein the defluorinating agent is a mixture of modified mesoporous molecular sieve and silicon powder, and the modified mesoporous molecular sieve is a mesoporous molecular sieve jointly modified by alkali metal fluoride and alkaline earth metal oxide; , Harmless discharge after activated carbon. The present invention uses modified mesoporous molecular sieve as catalyst to catalyze SF 6 Its catalytic reaction temperature is low, the reaction rate is fast, and the decomposition rate of sulfur hexafluoride is high, and then the tail gas is purified to realize SF 6 Continuous and efficient harmless treatment of gas.

Description

Technical field [0001] The present invention relates to a method for processing an exhaust gas sulfur hexafluoride, it belongs to the field of environmental protection. Background technique [0002] Sulfur hexafluoride (SF 6 ) Because of its good insulation and arc-extinguishing properties, it is widely used in recent years, electrical equipment insulating medium. Due to equipment failure or defects, will lead to sulfur hexafluoride gas leak, leaked to the safe operation and maintenance personnel of the hazards of sulfur hexafluoride gas in the air will, GB26860 "electricity safety regulations electrical power plants and substations part" was subject to air sulfur hexafluoride gas concentration should not exceed 1000ppm. And sulfur hexafluoride is a strong greenhouse gas, which is more than 23,000 times the greenhouse effect of carbon dioxide, sulfur hexafluoride gas, such as air, discharged without treatment into the atmosphere, will cause serious harm to environment. [0003] C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01D53/68
CPCB01D53/8659B01D2255/202Y02C20/30
Inventor 龚尚昆魏加强刘奕奕万涛吴俊杰徐松周舟常燕王笑钱晖
Owner STATE GRID HUNAN ELECTRIC POWER
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