阅读说明：本技术 一种六氟化硫气体质量分析系统 (Sulfur hexafluoride gas quality analysis system ) 是由 朱峰 祁炯 赵跃 刘伟 程伟 李朝清 杨坤 王祥科 王富德 于 2020-12-22 设计创作，主要内容包括：本发明提供了一种六氟化硫气体质量分析系统,能够实现六氟化硫气体质量中的空气、四氟化碳、六氟乙烷、八氟丙烷、矿物油以及水的分析检测,采用多柱联合分离和多种检测器组合的技术,组分之间无干扰峰,分离度R≥1.5,定性定量准确,灵敏度可达ppm级别。(The invention provides a sulfur hexafluoride gas quality analysis system, which can realize the analysis and detection of air, carbon tetrafluoride, hexafluoroethane, octafluoropropane, mineral oil and water in the sulfur hexafluoride gas quality, adopts the technology of multi-column combined separation and combination of various detectors, has no interference peaks among components, has the separation degree R of more than or equal to 1.5, is accurate in qualitative and quantitative determination, and has the sensitivity reaching the ppm level.)

1. A sulfur hexafluoride gas quality analysis system is characterized by comprising a first switching valve, a second switching valve, a third switching valve, a quantitative ring, a first chromatographic column, a second chromatographic column, a third chromatographic column, a first needle valve, a second needle valve, a hydrogen flame ionization detector, a thermal conductivity cell detector, a dew point transmitter and an infrared spectrophotometer, wherein the first switching valve, the second switching valve, the third switching valve, the quantitative ring, the first chromatographic column, the second chromatographic column, the third chromatographic column, the first needle valve, the second needle valve, the hydrogen flame;

the first switching valve, the second switching valve, and the third switching valve each include a plurality of interfaces;

the first interface of the first switching valve is connected with the sample inlet through an air passage pipeline, the second interface of the first switching valve is connected with the first end of a planar tee joint through an air passage pipeline, the second end of the planar tee joint is connected with the infrared spectrophotometer, the third end of the planar tee joint is connected with the fourth interface of the second switching valve through an air passage pipeline, the third interface of the first switching valve is connected with the tenth interface of the first switching valve through an air passage pipeline, the quantifying ring is arranged on the air passage pipeline connected with the third interface of the first switching valve and the tenth interface of the first switching valve, the fourth interface of the first switching valve is connected with a first carrier gas through an air passage pipeline, the fifth interface of the first switching valve is connected with the inlet of the second chromatographic column through an air passage pipeline, and the outlet of the second chromatographic column is connected with the cell detector, the sixth interface of the first switching valve is connected with the ninth interface of the first switching valve through an air channel pipeline, the first chromatographic column is arranged on the air channel pipeline connected with the sixth interface of the first switching valve and the ninth interface of the first switching valve, the seventh interface of the first switching valve is connected with the fifth interface of the third switching valve through an air channel pipeline, and the eighth interface of the first switching valve is connected with the second carrier gas through an air channel pipeline;

a first interface of the second switching valve is connected with the first needle valve through an air channel pipeline, a second interface of the second switching valve is connected with a third carrier gas through an air channel pipeline, and a third interface of the second switching valve is connected with the dew point transmitter through an air channel pipeline;

a first interface of the third switching valve is connected with the second needle valve through a gas pipeline; the second interface of the third switching valve is connected with a fourth carrier gas through a gas pipeline, the third interface of the third switching valve is connected with the sixth interface of the third switching valve through a gas pipeline, and the fourth interface of the third switching valve is connected with the hydrogen flame ionization detector through a gas pipeline.

2. The sulfur hexafluoride gas mass analysis system of claim 1, wherein the first switching valve is a ten-way switching valve.

3. The sulfur hexafluoride gas mass analysis system of claim 1, wherein the second switching valve is a four-way switching valve.

4. The sulfur hexafluoride gas mass analysis system of claim 1, wherein the third switching valve is a six-way switching valve.

5. The sulfur hexafluoride gas mass analysis system of claim 1, wherein the first, second and third chromatographic columns are polymeric chromatographic columns.

Technical Field

The invention relates to the field of sulfur hexafluoride gas quality analysis, in particular to a sulfur hexafluoride gas quality analysis system.

Background

Sulfur hexafluoride (SF6) has good insulating and arc extinguishing performance, and is commonly used in gas insulated switchgear. The contents of air, carbon tetrafluoride, hexafluoroethane, octafluoropropane and water therein need to be detected before use. On the market, a pulse discharge helium ionization detector is commonly used for detection and analysis, but the pulse discharge helium ionization detector has the defects of expensive analysis instrument and high requirement on operators.

Disclosure of Invention

Aiming at the problems, the invention provides a sulfur hexafluoride gas quality analysis system, which realizes the component analysis of air, carbon tetrafluoride, hexafluoroethane, octafluoropropane and water in sulfur hexafluoride gas.

In order to achieve the purpose, the invention provides the following scheme:

a sulfur hexafluoride gas quality analysis system comprises a first switching valve, a second switching valve, a third switching valve, a quantitative ring, a first chromatographic column, a second chromatographic column, a third chromatographic column, a first needle valve, a second needle valve, a hydrogen flame ionization detector, a thermal conductivity cell detector, a dew point transmitter and an infrared spectrophotometer;

the first switching valve, the second switching valve, and the third switching valve each include a plurality of interfaces;

the first interface of the first switching valve is connected with the sample inlet through an air passage pipeline, the second interface of the first switching valve is connected with the first end of a planar tee joint through an air passage pipeline, the second end of the planar tee joint is connected with the infrared spectrophotometer, the third end of the planar tee joint is connected with the fourth interface of the second switching valve through an air passage pipeline, the third interface of the first switching valve is connected with the tenth interface of the first switching valve through an air passage pipeline, the quantifying ring is arranged on the air passage pipeline connected with the third interface of the first switching valve and the tenth interface of the first switching valve, the fourth interface of the first switching valve is connected with a first carrier gas through an air passage pipeline, the fifth interface of the first switching valve is connected with the inlet of the second chromatographic column through an air passage pipeline, and the outlet of the second chromatographic column is connected with the cell detector, the sixth interface of the first switching valve is connected with the ninth interface of the first switching valve through an air channel pipeline, the first chromatographic column is arranged on the air channel pipeline connected with the sixth interface of the first switching valve and the ninth interface of the first switching valve, the seventh interface of the first switching valve is connected with the fifth interface of the third switching valve through an air channel pipeline, and the eighth interface of the first switching valve is connected with the second carrier gas through an air channel pipeline;

a first interface of the second switching valve is connected with the first needle valve through an air channel pipeline, a second interface of the second switching valve is connected with a third carrier gas through an air channel pipeline, and a third interface of the second switching valve is connected with the dew point transmitter through an air channel pipeline;

a first interface of the third switching valve is connected with the second needle valve through a gas pipeline; the second interface of the third switching valve is connected with a fourth carrier gas through a gas pipeline, the third interface of the third switching valve is connected with the sixth interface of the third switching valve through a gas pipeline, and the fourth interface of the third switching valve is connected with the hydrogen flame ionization detector through a gas pipeline.

Optionally, the first switching valve is a ten-way switching valve.

Optionally, the second switching valve is a four-way switching valve.

Optionally, the third switching valve is a six-way switching valve.

Optionally, the first chromatography column, the second chromatography column and the third chromatography column are all high molecular polymer chromatography columns.

According to the specific embodiment provided by the invention, the invention discloses the following technical effects:

the invention provides a sulfur hexafluoride gas quality analysis system, which can realize the analysis and detection of air, carbon tetrafluoride, hexafluoroethane, octafluoropropane, mineral oil and water in the sulfur hexafluoride gas quality, adopts the technology of multi-column combined separation and combination of various detectors, has no interference peaks among components, has the separation degree R of more than or equal to 1.5, is accurate in qualitative and quantitative determination, and has the sensitivity reaching the ppm level.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

FIG. 1 is a schematic diagram of a sampling state of a sulfur hexafluoride gas mass analysis system according to an embodiment of the present invention;

FIG. 2 is a schematic view of a sample introduction state of a sulfur hexafluoride gas quality analysis system according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a state of detecting hexafluoroethane by a sulfur hexafluoride gas mass analysis system according to an embodiment of the present invention.

Description of the symbols: 1-a first switching valve; 2-a second switching valve; 3-a third switching valve; 4-a quantification ring; 5-a sample inlet; 6-a first carrier gas; 7-a second carrier gas; 8-a first chromatography column; 9-a second chromatographic column; 10-a first needle valve; 11-a third carrier gas; 12-a dew point transmitter; 13-third chromatography column; 14-a second needle valve; 15-a fourth carrier gas; 16-thermal conductivity cell detector; 17-a hydrogen flame ionization detector; 18-infrared spectrophotometer.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

As shown in fig. 1 to 3, a sulfur hexafluoride gas quality analysis system includes a first switching valve 1, a second switching valve 2, a third switching valve 3, a quantitative ring 4, a first chromatographic column 8, a second chromatographic column 9, a third chromatographic column 13, a first needle valve 10, a second needle valve 14, a hydrogen flame ionization detector 17, a thermal conductivity cell detector 16, a dew point transmitter 12, and an infrared spectrophotometer 18.

The first switching valve 1, the second switching valve 2, and the third switching valve 3 each include a plurality of ports. The first switching valve 1 is a ten-way switching valve, the second switching valve 2 is a four-way switching valve, and the third switching valve 3 is a six-way switching valve. The first chromatographic column 8, the second chromatographic column 9 and the third chromatographic column 13 are all high molecular polymer chromatographic columns.

The first interface of the first switching valve 1 is connected with the sample inlet 5 through an air channel pipeline, the second interface of the first switching valve 1 is connected with the first end of a plane tee joint through an air channel pipeline, the second end of the plane tee joint is connected with the infrared spectrophotometer 18, the third end of the plane tee joint is connected with the fourth interface of the second switching valve 2 through an air channel pipeline, the third interface of the first switching valve 1 is connected with the tenth interface of the first switching valve 1 through an air channel pipeline, the quantifying ring 4 is arranged on the air channel pipeline which is connected with the third interface of the first switching valve 1 and the tenth interface of the first switching valve 1, the fourth interface of the first switching valve 1 is connected with the first carrier gas 6 through an air channel pipeline, the fifth interface of the first switching valve 1 is connected with the inlet of the second chromatographic column 9 through an air channel pipeline, the outlet of the second chromatographic column 9 is connected with the thermal conductivity cell detector 16, the sixth interface of the first switching valve 1 is connected with the ninth interface of the first switching valve 1 through an air path pipeline, the first chromatographic column 8 is arranged on the sixth interface of the first switching valve 1 and the air path pipeline connected with the ninth interface of the first switching valve 1, the seventh interface of the first switching valve 1 is connected with the fifth interface of the third switching valve 3 through an air path pipeline, and the eighth interface of the first switching valve 1 is connected with the second carrier gas 7 through an air path pipeline.

The first interface of the second switching valve 2 is connected with the first needle valve 10 through an air channel pipeline, the second interface of the second switching valve 2 is connected with a third carrier gas 11 through an air channel pipeline, and the third interface of the second switching valve 2 is connected with the dew point transmitter 12 through an air channel pipeline.

A first interface of the third switching valve 3 is connected with the second needle valve 14 through an air pipeline; the second port of the third switching valve 3 is connected with a fourth carrier gas 15 through a gas pipeline, the third port of the third switching valve 3 is connected with the sixth port of the third switching valve 3 through a gas pipeline, and the fourth port of the third switching valve 3 is connected with the hydrogen flame ionization detector 17 through a gas pipeline.

The working principle is as follows: sampling: the sample sequentially passes through the sample inlet 5, the first interface, the tenth interface, the quantitative ring 4 and the third interface of the first switching valve 1, finally flows into the fourth interface and the first interface of the second switching valve 2 from the second interface of the first switching valve 1, and is discharged by the first needle valve 10.

The analysis process comprises the following steps: measuring the mineral oil, selecting a certain number of filter membranes with known weight, numbering, smearing the carbon tetrafluoride solution of the mineral oil with known concentration on the filter membranes, weighing the mass of the filter membranes after volatilization, measuring absorbance, drawing a standard curve chart by using the weight gained by the filter membranes, allowing the sulfur hexafluoride gas to be detected to pass through the filter membranes at a certain flow speed, detecting the mineral oil, measuring the absorbance by using an infrared spectrophotometer, and reading the content of the mineral oil on the standard curve.

The first switching valve 1 is switched to the state shown in fig. 2, the first carrier gas 6 carries the sample in the quantitative ring 4 to enter the first chromatographic column 8, and the air carbon tetrafluoride component is pre-separated by the first chromatographic column 8, enters the analytical chromatographic column 9 and is detected by the thermal conductivity cell detector 12 after being separated.

The second switching valve 2 is switched to the state shown in fig. 2, and the sample enters the dew point transmitter 12 in sequence through the fourth interface and the third interface of the second switching valve 2, and the moisture is detected by the dew point transmitter 12.

The third switching valve 3 is switched to the state shown in fig. 3, the second carrier gas 7 carries hexafluoroethane hexafluoride in the first chromatographic column 8 into the third chromatographic column 13, and when hexafluoroethane is completely separated from the third chromatographic column 13, hexafluoroethane is detected by the hydrogen flame ionization detection 17. The third switching valve 3 is reset to the state shown in fig. 1, and the fourth carrier gas 15 carrying the sulfur hexafluoride in the third chromatographic column 13 is discharged through the second needle valve 14. When the second carrier gas 7 carries the hexafluoroethane hexafluoride in the first chromatographic column 8 completely into the third chromatographic column 13, the first switching 1 is reset to the state of fig. 1, and the second carrier gas 7 carries the octafluoropropane in the second chromatographic column 8 and is detected by the hydrogen flame ionization detection 17.

Therefore, the method can realize the component analysis of air, carbon tetrafluoride, hexafluoroethane, octafluoropropane and water in the sulfur hexafluoride gas.

The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.