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Method for detecting content of sulfur dioxide in sulfur hexafluoride gas

A technology of sulfur hexafluoride gas and sulfur dioxide, which is used in measuring devices, instruments, scientific instruments, etc., can solve the problems of undetectable, low component content, undetectable chromatographic peaks, etc., to increase accuracy and improve content , the effect of increasing the injection concentration

Active Publication Date: 2018-03-30
GUANGXI POWER GRID ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, chromatography is commonly used to detect decomposition products in sulfur hexafluoride, but there are two problems in detecting trace decomposition products in sulfur hexafluoride gas by conventional chromatography: one is that the content of some components is too low to be detected, and the other is that The boiling point of some impurity components is very close to that of sulfur hexafluoride gas, and the retention time in gas chromatography is similar, and the chromatographic peaks are easily covered by sulfur hexafluoride and cannot be detected

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A detection method of sulfur dioxide content in sulfur hexafluoride gas, comprising the following steps:

[0024] (1) Sulfur hexafluoride gas containing 1 μL / L sulfur dioxide is used as a gas sample, and the gas sample is injected through the three-stage refrigeration concentration of the gas concentrator, and the three-stage refrigeration concentration sample injection includes the following steps: 1) The gas sample passes through the first One-stage refrigeration, the first-stage refrigeration conditions are: the cooling and trapping temperature of module M1 is -50°C, and then the M1 module is heated to 8°C, so that the sample is desorbed and transferred to the module M2; 2) The gas sample is subjected to the second-stage refrigeration, The second-stage refrigeration condition is: the cooling and adsorption temperature of module M2 is -60°C, and the desorption temperature is 210°C; 3) The gas sample is subjected to the third-stage refrigeration, and the third-stage ref...

Embodiment 2

[0032] A detection method of sulfur dioxide content in sulfur hexafluoride gas, comprising the following steps:

[0033] (1) Sulfur hexafluoride gas containing 1 μL / L sulfur dioxide is used as a gas sample, and the gas sample is injected through the three-stage refrigeration concentration of the gas concentrator, and the three-stage refrigeration concentration sample injection includes the following steps: 1) The gas sample passes through the first One-stage refrigeration, the first-stage refrigeration conditions are: the cooling and trapping temperature of module M1 is -30°C, and then the M1 module is heated to 12°C, so that the sample is desorbed and transferred to the module M2; 2) The gas sample is subjected to the second-stage refrigeration, The second-stage refrigeration condition is: the cooling and adsorption temperature of module M2 is -40°C, and the desorption temperature is 230°C; 3) The gas sample is subjected to the third-stage refrigeration, and the third-stage re...

Embodiment 3

[0041] A detection method of sulfur dioxide content in sulfur hexafluoride gas, comprising the following steps:

[0042] (1) Sulfur hexafluoride gas containing 1 μL / L sulfur dioxide is used as a gas sample, and the gas sample is injected through the three-stage refrigeration concentration of the gas concentrator, and the three-stage refrigeration concentration sample injection includes the following steps: 1) The gas sample passes through the first One-stage refrigeration, the first-stage refrigeration conditions are: the cooling and trapping temperature of module M1 is -40°C, and then the M1 module is heated to 10°C, so that the sample is desorbed and transferred to the module M2; 2) The gas sample is subjected to the second-stage refrigeration, The second-stage refrigeration condition is: the cooling and adsorption temperature of module M2 is -50°C, and the desorption temperature is 220°C; 3) The gas sample is subjected to the third-stage refrigeration, and the third-stage re...

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Abstract

The invention relates to a method for detecting the content of sulfur dioxide in a sulfur hexafluoride gas. The method comprises the following steps: (1) feeding a gas sample in a three-stage refrigeration concentration mode; (2) performing qualitative and quantitative analysis on the sample by using a gaschromatographic mass spectrometer. According to the method for detecting the content of sulfur dioxide in the sulfur hexafluoride gas, the gas sample is fed in the three-stage refrigeration concentration mode, and moisture in the sulfur hexafluoride gas can be removed through first-stage refrigeration, so that the adverse influence of the moisture upon the testing result, namely the content of a sulfur dioxide gas in the sample, is reduced; through second-stage refrigeration, a most partof the sulfur hexafluoride gas can be separated from a decomposition product, so that the feeding concentration of the sulfur dioxide gas is greatly increased; through third-stage refrigeration, the sulfur dioxide gas is further enriched at a low temperature, and the sulfur dioxide content detection precision is further improved; in the mass spectrometry analysis process, the content of the sulfurdioxide can be detected after a sulfur hexafluoride outlet peak, so that interference of the sulfur hexafluoride is avoided, and the sulfur dioxide gas detection accuracy is improved.

Description

technical field [0001] The invention relates to the field of detection of sulfur dioxide content, in particular to a detection method of sulfur dioxide content in sulfur hexafluoride gas. Background technique [0002] Sulfur hexafluoride gas is widely used in electrical equipment, but due to the presence of water and oxygen, sulfur hexafluoride will decompose and produce various decomposition products such as sulfur dioxide. Among the many decomposition products of sulfur hexafluoride, sulfur dioxide is considered to be a stable derivative of fault discharge characteristics, and internal faults of equipment can be diagnosed by measuring the content of sulfur dioxide. At present, chromatography is commonly used to detect decomposition products in sulfur hexafluoride, but there are two problems in detecting trace decomposition products in sulfur hexafluoride gas by conventional chromatography: one is that the content of some components is too low to be detected, and the other ...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/16G01N30/06G01N30/08G01N30/14G01N30/72G01N30/86
CPCG01N30/02G01N30/06G01N30/08G01N30/14G01N30/16G01N30/72G01N30/8634
Inventor 刘陈瑶罗宗昌张龙飞朱立平
Owner GUANGXI POWER GRID ELECTRIC POWER RES INST
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