CN104155172A - Low temperature enrichment method of sulfur hexafluoride decomposition product - Google Patents
Low temperature enrichment method of sulfur hexafluoride decomposition product Download PDFInfo
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- CN104155172A CN104155172A CN201410405950.2A CN201410405950A CN104155172A CN 104155172 A CN104155172 A CN 104155172A CN 201410405950 A CN201410405950 A CN 201410405950A CN 104155172 A CN104155172 A CN 104155172A
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- decomposition product
- low temperature
- sulfur hexafluoride
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Abstract
The invention provides a low temperature enrichment method of a sulfur hexafluoride decomposition product. The method is characterized in that the method comprises the following steps: 1, putting a gas chamber provided with an inlet and an outlet in a temperature-adjustable low temperature cold trap, wherein each of the inlet and the outlet is provided with a valve; 2, closing the outlet valve, introducing a sample gas to be enriched into the gas chamber until the gas pressure in the gas chamber and the gas pressure in a sample gas bottle are balanced, closing the inlet valve, and cooling the cold trap to a temperature slightly lower than the melting point of SF6 to make most SF6 condensed to a solid; and 3, opening the outlet valve, and extracting the enriched SF6 decomposition product. The method utilizes a low temperature to remove most SF6 in the mixed gas, reduces the interference of SF6 to other decomposition products during analysis, enriches a tiny amount of the SF6 decomposition product, and improves the concentration of an analysis sample to meet requirements of an analysis detection device. The method has the advantages of simple technology, low precision requirements on the analysis detection device, low analysis detection cost and high precision.
Description
Technical field
The invention provides a kind of sulfur hexafluoride decomposition product low temperature enrichment method, belong to power industry sulfur hexafluoride decomposition product field tests.
Background technology
Current SF
6switch and combined electric appliance equipment are widely used in whole power industry.SF in electrical equipment
6gas can decompose and generate some harmful subfluoride under the effect of electric arc and high temperature, and these substance reactions are very competent.When running into moisture and oxygen, these products can further react with electrode material, moisture etc. again, generate multiple compounds (SO
2f
2, SOF
2, SO
2, H
2s, HF etc.).These decomposition products have toxicity or corrosivity mostly, very easily jeopardize the serviceable life of equipment and staff's safety, but conventional chromatographic process is difficult to decomposition product to carry out analyzing and testing: on the one hand because the content of sulfur hexafluoride decomposition product very low (zero to tens ppm); The decomposition product having is on the other hand (as SO
2f
2) and SF
6the character of gas is very approaching, and in gas chromatograph, retention time is more or less the same, and its chromatographic peak is easily by SF
6background is covered.For the problems referred to above, the method for taking mostly at present is the precision that improves analyzing and testing equipment, enables SF
6decomposition product detects, and the problem of bringing is like this: be subject to the impact of various factors or condition, the precision of analyzing and testing equipment improves limited, and the large leap ahead of cost.So how to improve analytic sample concentration, make existing analyzing and testing equipment can carry out accurate analysis detection, just become this area technical barrier urgently to be resolved hurrily.
Summary of the invention
The object of this invention is to provide a kind of energy solves an above-mentioned difficult problem, passes through SF
6decomposition product enrichment, improves analytic sample concentration to meet the sulfur hexafluoride decomposition product low temperature enrichment method of analyzing and testing equipment requirement.Its technical scheme is: on the one hand by decomposition product enrichment, improve the concentration of analytic sample; Remove on the other hand most SF in mixed gas
6, reduce SF
6the interference of background to other decomposition products.
A sulfur hexafluoride decomposition product low temperature enrichment method, is characterized in that adopting following steps: 1) air chamber that is provided with import and outlet is placed in the adjustable cryotrap of temperature, import and outlet are equipped with valve; 2) close outlet valve, in air chamber, be filled with the sample gas for the treatment of enrichment, until then the air pressure balance in air chamber and in sample gas cylinder closes imported valve, condenser temperature is down to a little less than SF
6melting temperature, most of SF now
6become solid-state; 3) open outlet valve, the SF after Extraction and enrichment
6decomposition product.
Described sulfur hexafluoride decomposition product low temperature enrichment method, when sulfur hexafluoride decomposition product concentration is lower, repeating step 2) 2～4 times.
Described sulfur hexafluoride decomposition product low temperature enrichment method, step 2) in air chamber with sample gas cylinder in equilibrium air pressure be generally 0.6MPa.
Its principle of work is: under enclosed system and uniform temperature, any liquid (or solid) has a specific vapor pressure also referred to as saturated vapour pressure.Under this vapor pressure, the congeal into speed of liquid (or solid) of gas cold equates to reach with the speed that is evaporated to gas the state of balancing each other.When this system is exerted pressure or reduced temperature, gas just can condense and reach rapidly new balance.So just can be by cryogenic freezing method by most of SF in mixed gas
6gas solidifies to be removed, decomposition product in gas phase enrichment concentrated, to meet analyzing and testing equipment requirement.
Compared with prior art, its advantage is in the present invention:
1, by micro-SF
6decomposition product enrichment, the concentration of raising analytic sample;
2, utilize low temperature to remove most SF in mixed gas
6, SF while reducing to analyze
6to the interference of other decomposition products, accuracy of quantitative analysis is high.
3, technique is simple, and analyzing and testing equipment is not had to too high accuracy requirement, and analyzing and testing cost is low.
Embodiment
Below in conjunction with embodiment, the present invention will be further described:
Step 1): the air chamber that is provided with import and outlet is placed in the adjustable cryotrap of temperature, and import and outlet are equipped with valve;
Step 2): close outlet valve, in air chamber, be filled with the sample gas for the treatment of enrichment, until the air pressure balance in air chamber and in sample gas cylinder is 0.6MPa, then close imported valve, condenser temperature is down to-64 ℃, now SF
6condense into solid-state, repeating step 2) 2～4 times;
Step 3): open outlet valve, the SF after Extraction and enrichment
6decomposition product.
After testing, in the sulfur hexafluoride decomposition product after enrichment, each concentration content all increases decades of times, meets the requirement of analyzing and testing equipment completely.
Claims (3)
1. a sulfur hexafluoride decomposition product low temperature enrichment method, is characterized in that adopting following steps: 1) air chamber that is provided with import and outlet is placed in the adjustable cryotrap of temperature, import and outlet are equipped with valve; 2) close outlet valve, in air chamber, be filled with the sample gas for the treatment of enrichment, until then the air pressure balance in air chamber and in sample gas cylinder closes imported valve, condenser temperature is down to a little less than SF
6melting temperature, SF now
6condense into solid-state; 3) open outlet valve, the SF after Extraction and enrichment
6decomposition product.
2. sulfur hexafluoride decomposition product low temperature enrichment method according to claim 1, is characterized in that: when sulfur hexafluoride decomposition product concentration is lower, repeating step 2) 2～4 times.
3. sulfur hexafluoride decomposition product low temperature enrichment method according to claim 1, is characterized in that: step 2) in air chamber with sample gas cylinder in equilibrium air pressure be generally 0.6MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410405950.2A CN104155172A (en) | 2014-08-18 | 2014-08-18 | Low temperature enrichment method of sulfur hexafluoride decomposition product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410405950.2A CN104155172A (en) | 2014-08-18 | 2014-08-18 | Low temperature enrichment method of sulfur hexafluoride decomposition product |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104155172A true CN104155172A (en) | 2014-11-19 |
Family
ID=51880733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410405950.2A Pending CN104155172A (en) | 2014-08-18 | 2014-08-18 | Low temperature enrichment method of sulfur hexafluoride decomposition product |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104155172A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424419A (en) * | 2015-12-22 | 2016-03-23 | 国网河南省电力公司济源供电公司 | SF6 intermediate decomposition product separating unit and use method thereof |
| CN107860837A (en) * | 2017-11-01 | 2018-03-30 | 广西电网有限责任公司电力科学研究院 | A kind of detection method of content of sulfur dioxide in sulfur hexafluoride gas |
| CN113092232A (en) * | 2021-04-01 | 2021-07-09 | 国网陕西省电力公司电力科学研究院 | Gas enrichment tank capable of stably outputting high-efficiency liquefied gas |
| CN113720973A (en) * | 2021-10-19 | 2021-11-30 | 中国电力科学研究院有限公司 | SF inside GIS equipment6Gas monitoring system and monitoring method |
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| EP1471343A1 (en) * | 2003-03-31 | 2004-10-27 | Hitachi, Ltd. | Apparatus and method for detecting vaporized gas |
| CN102012333A (en) * | 2009-09-04 | 2011-04-13 | 中国石油化工股份有限公司 | Device for purifying and enriching inert gases and use method |
| CN102527454A (en) * | 2012-01-31 | 2012-07-04 | 复旦大学 | Micro-fluid control drop concentration device for sample enrichment |
| WO2012142672A1 (en) * | 2011-04-21 | 2012-10-26 | Abb Technology Ltd | A plant and method for recovering sulphur hexafluoride for reuse |
| CN102765701A (en) * | 2012-08-10 | 2012-11-07 | 江苏海立普电力科技有限公司 | Method for purifying sulfur hexafluoride and purifying and solidifying tank of sulfur hexafluoride |
-
2014
- 2014-08-18 CN CN201410405950.2A patent/CN104155172A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1471343A1 (en) * | 2003-03-31 | 2004-10-27 | Hitachi, Ltd. | Apparatus and method for detecting vaporized gas |
| CN102012333A (en) * | 2009-09-04 | 2011-04-13 | 中国石油化工股份有限公司 | Device for purifying and enriching inert gases and use method |
| WO2012142672A1 (en) * | 2011-04-21 | 2012-10-26 | Abb Technology Ltd | A plant and method for recovering sulphur hexafluoride for reuse |
| CN102527454A (en) * | 2012-01-31 | 2012-07-04 | 复旦大学 | Micro-fluid control drop concentration device for sample enrichment |
| CN102765701A (en) * | 2012-08-10 | 2012-11-07 | 江苏海立普电力科技有限公司 | Method for purifying sulfur hexafluoride and purifying and solidifying tank of sulfur hexafluoride |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424419A (en) * | 2015-12-22 | 2016-03-23 | 国网河南省电力公司济源供电公司 | SF6 intermediate decomposition product separating unit and use method thereof |
| CN107860837A (en) * | 2017-11-01 | 2018-03-30 | 广西电网有限责任公司电力科学研究院 | A kind of detection method of content of sulfur dioxide in sulfur hexafluoride gas |
| CN107860837B (en) * | 2017-11-01 | 2020-05-12 | 广西电网有限责任公司电力科学研究院 | Method for detecting sulfur dioxide content in sulfur hexafluoride gas |
| CN113092232A (en) * | 2021-04-01 | 2021-07-09 | 国网陕西省电力公司电力科学研究院 | Gas enrichment tank capable of stably outputting high-efficiency liquefied gas |
| CN113720973A (en) * | 2021-10-19 | 2021-11-30 | 中国电力科学研究院有限公司 | SF inside GIS equipment6Gas monitoring system and monitoring method |
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Application publication date: 20141119 |