阅读说明：本技术 一种六氟化硫氮气混合气体分解产物分析系统 (Sulfur hexafluoride nitrogen gas mixture decomposition product analysis system ) 是由 陈英 马凤翔 赵跃 程伟 徐霄筱 刘添天 袁小芳 房超 刘新云 于 2020-12-22 设计创作，主要内容包括：本发明公开了一种六氟化硫氮气混合气体分解产物分析系统,能够实现六氟化硫氮气混合气体中的氢气、氧气、一氧化碳、四氟化碳、甲烷、三氟化氮、二氧化碳、氧化亚氮、六氟乙烷、硫酰氟、硫化氢、八氟丙烷、氟化亚硫酰、羰基硫、二氧化硫、二硫化碳等16种组分分析,采用中心切割与反吹分离技术,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ppb级别。(The invention discloses a sulfur hexafluoride nitrogen mixed gas decomposition product analysis system, which can realize 16 component analysis of hydrogen, oxygen, carbon monoxide, carbon tetrafluoride, methane, nitrogen trifluoride, carbon dioxide, nitrous oxide, hexafluoroethane, sulfuryl fluoride, hydrogen sulfide, octafluoropropane, thionyl fluoride, carbonyl sulfide, sulfur dioxide, carbon disulfide and the like in sulfur hexafluoride nitrogen mixed gas, adopts a center cutting and back blowing separation technology, has no interference peak among components, has a separation degree R of more than or equal to 1.5, is accurate in quantification and has a sensitivity reaching ppb level.)

1. A sulfur hexafluoride nitrogen gas mixture decomposition product analysis system is characterized by comprising: the device comprises a first switching valve, a second switching valve, a third switching valve, a fourth switching valve, a fifth switching valve, a first quantitative ring, a second quantitative ring, a third quantitative ring, a first chromatographic column, a second chromatographic column, a third chromatographic column, a fourth chromatographic column, a fifth chromatographic column, a sixth chromatographic column, a first needle valve, a second needle valve, a third needle valve, a fourth needle valve, a first pulse discharge helium ionization detector and a second pulse discharge helium ionization detector;

the first interface of the first switching valve is connected with the sample inlet through an air channel pipeline, the second interface of the first switching valve is connected with the first interface of the second switching valve through an air channel pipeline, the third interface of the first switching valve is connected with the sixth interface of the first switching valve through an air channel pipeline, the second quantitative ring is arranged on the air channel pipeline connected with the third interface of the first switching valve and the sixth interface of the first switching valve, the fourth interface of the first switching valve is connected with the second carrier gas through an air channel pipeline, the fifth interface of the first switching valve is connected with the inlet of the second chromatographic column through an air channel pipeline, the seventh interface of the first switching valve is connected with the tenth interface of the first switching valve through an air channel pipeline, and the first quantitative ring is arranged on the air channel pipeline connected with the seventh interface of the first switching valve and the tenth interface of the first switching valve, the eighth interface of the first switching valve is connected with the inlet of the first chromatographic column through a gas path pipeline, and the ninth interface of the first switching valve is connected with the first carrier gas through a gas path pipeline;

the second interface of the second switching valve is connected with the sample outlet through an air channel pipeline, the third interface of the second switching valve is connected with the tenth interface of the second switching valve through an air channel pipeline, the third quantitative ring is arranged on the air channel pipeline connecting the third interface of the second switching valve with the tenth interface of the second switching valve, the fourth interface of the second switching valve is connected with the fourth carrier gas through an air channel pipeline, the fifth interface of the second switching valve is connected with the first needle valve through an air channel pipeline, the sixth interface of the second switching valve is connected with the ninth interface of the second switching valve through an air channel pipeline, the third chromatographic column is arranged on the air channel pipeline connecting the sixth interface of the second switching valve with the ninth interface of the second switching valve, and the seventh interface of the second switching valve is combined with the outlet of the sixth chromatographic column through an air channel pipeline, the eighth interface of the second switching valve is connected with a third carrier gas through a gas pipeline;

a first interface of the third switching valve is connected with the second needle valve through an air passage pipeline, a second interface of the third switching valve is connected with fifth carrier gas through an air passage pipeline, a third interface of the third switching valve is connected with an inlet of a fifth chromatographic column through an air passage pipeline, a fourth interface of the third switching valve is connected with an outlet of the second chromatographic column through an air passage pipeline, a fifth interface of the third switching valve is connected with an inlet of a fourth chromatographic column through an air passage pipeline, and a sixth interface of the third switching valve is connected with sixth carrier gas through an air passage pipeline;

a first interface of the fourth switching valve is directly connected with a third interface of the third switching valve through an air pipeline, a second interface of the fourth switching valve is connected with a third needle valve through an air pipeline, a fourth interface of the fourth switching valve is connected with seventh carrier gas through an air pipeline, a fifth interface of the fourth switching valve is connected with an inlet of a sixth chromatographic column through an air pipeline, and a sixth interface of the fourth switching valve is connected with an outlet of the first chromatographic column through an air pipeline;

the first interface of the fifth switching valve is connected with the second pulse discharge helium ionization detector through an air pipeline, the second interface of the fifth switching valve is connected with the outlet of the fifth chromatographic column through an air pipeline, the third interface of the fifth switching valve is connected with the fourth needle valve through an air pipeline, and the fourth interface of the fifth switching valve is connected with the outlet of the fourth chromatographic column through an air pipeline.

2. The sulfur hexafluoride nitrogen gas mixture decomposition product analysis system of claim 1, wherein the first switching valve and the second switching valve are ten-way switching valves.

3. The sulfur hexafluoride nitrogen gas mixture decomposition product analysis system of claim 1, wherein the third switching valve and the fourth switching valve are six-way switching valves.

4. The sulfur hexafluoride nitrogen mixed gas decomposition product analysis system of claim 1, wherein the fifth switching valve is a four-way valve.

5. The sulfur hexafluoride nitrogen mixed gas decomposition product analysis system of claim 1, wherein the first chromatographic column, the third chromatographic column, the fifth chromatographic column, and the sixth chromatographic column are all high molecular polymer chromatographic columns.

6. The sulfur hexafluoride nitrogen gas mixture decomposition product analysis system of claim 1, wherein the second chromatographic column and the fourth chromatographic column are molecular sieve chromatographic columns.

Technical Field

The invention relates to the field of analysis of sulfur hexafluoride nitrogen mixed gas decomposition products, in particular to a system for analyzing sulfur hexafluoride nitrogen mixed gas decomposition products.

Background

The sulfur hexafluoride nitrogen gas mixture has good insulating property, and in recent years, when the sulfur hexafluoride nitrogen gas mixture is commonly used in Gas Insulated Switchgear (GIS), decomposition products such as hydrogen, oxygen, carbon monoxide, carbon tetrafluoride, methane, nitrogen trifluoride, carbon dioxide, nitrous oxide, hexafluoroethane, sulfuryl fluoride, hydrogen sulfide, octafluoropropane, thionyl fluoride, carbonyl sulfide, sulfur dioxide, carbon disulfide and the like are generated when a fault occurs. In order to prevent the occurrence of faults, a gas chromatograph needs to be used for detecting whether the decomposition products are contained in the gas chromatograph at regular intervals, and therefore an impurity component analysis system used in the sulfur hexafluoride nitrogen mixed gas decomposition product chromatograph needs to be designed.

Disclosure of Invention

The invention aims to provide a sulfur hexafluoride nitrogen mixed gas decomposition product analysis system, which is used for realizing component analysis of hydrogen, oxygen, carbon monoxide, carbon tetrafluoride, methane, nitrogen trifluoride, carbon dioxide, nitrous oxide, hexafluoroethane, sulfuryl fluoride, hydrogen sulfide, octafluoropropane, thionyl fluoride, carbonyl sulfide, sulfur dioxide, carbon disulfide and the like in the sulfur hexafluoride nitrogen mixed gas.

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

a sulfur hexafluoride nitrogen gas mixture decomposition product analysis system includes: the device comprises a first switching valve, a second switching valve, a third switching valve, a fourth switching valve, a fifth switching valve, a first quantitative ring, a second quantitative ring, a third quantitative ring, a first chromatographic column, a second chromatographic column, a third chromatographic column, a fourth chromatographic column, a fifth chromatographic column, a sixth chromatographic column, a first needle valve, a second needle valve, a third needle valve, a fourth needle valve, a first pulse discharge helium ionization detector and a second pulse discharge helium ionization detector;

the first interface of the first switching valve is connected with the sample inlet through an air channel pipeline, the second interface of the first switching valve is connected with the first interface of the second switching valve through an air channel pipeline, the third interface of the first switching valve is connected with the sixth interface of the first switching valve through an air channel pipeline, the second quantitative ring is arranged on the air channel pipeline connected with the third interface of the first switching valve and the sixth interface of the first switching valve, the fourth interface of the first switching valve is connected with the second carrier gas through an air channel pipeline, the fifth interface of the first switching valve is connected with the inlet of the second chromatographic column through an air channel pipeline, the seventh interface of the first switching valve is connected with the tenth interface of the first switching valve through an air channel pipeline, and the first quantitative ring is arranged on the air channel pipeline connected with the seventh interface of the first switching valve and the tenth interface of the first switching valve, the eighth interface of the first switching valve is connected with the inlet of the first chromatographic column through a gas path pipeline, and the ninth interface of the first switching valve is connected with the first carrier gas through a gas path pipeline;

the second interface of the second switching valve is connected with the sample outlet through an air channel pipeline, the third interface of the second switching valve is connected with the tenth interface of the second switching valve through an air channel pipeline, the third quantitative ring is arranged on the air channel pipeline connecting the third interface of the second switching valve with the tenth interface of the second switching valve, the fourth interface of the second switching valve is connected with the fourth carrier gas through an air channel pipeline, the fifth interface of the second switching valve is connected with the first needle valve through an air channel pipeline, the sixth interface of the second switching valve is connected with the ninth interface of the second switching valve through an air channel pipeline, the third chromatographic column is arranged on the air channel pipeline connecting the sixth interface of the second switching valve with the ninth interface of the second switching valve, and the seventh interface of the second switching valve is combined with the outlet of the sixth chromatographic column through an air channel pipeline, the eighth interface of the second switching valve is connected with a third carrier gas through a gas pipeline;

a first interface of the third switching valve is connected with the second needle valve through an air passage pipeline, a second interface of the third switching valve is connected with fifth carrier gas through an air passage pipeline, a third interface of the third switching valve is connected with an inlet of a fifth chromatographic column through an air passage pipeline, a fourth interface of the third switching valve is connected with an outlet of the second chromatographic column through an air passage pipeline, a fifth interface of the third switching valve is connected with an inlet of a fourth chromatographic column through an air passage pipeline, and a sixth interface of the third switching valve is connected with sixth carrier gas through an air passage pipeline;

a first interface of the fourth switching valve is directly connected with a third interface of the third switching valve through an air pipeline, a second interface of the fourth switching valve is connected with a third needle valve through an air pipeline, a fourth interface of the fourth switching valve is connected with seventh carrier gas through an air pipeline, a fifth interface of the fourth switching valve is connected with an inlet of a sixth chromatographic column through an air pipeline, and a sixth interface of the fourth switching valve is connected with an outlet of the first chromatographic column through an air pipeline;

the first interface of the fifth switching valve is connected with the second pulse discharge helium ionization detector through an air pipeline, the second interface of the fifth switching valve is connected with the outlet of the fifth chromatographic column through an air pipeline, the third interface of the fifth switching valve is connected with the fourth needle valve through an air pipeline, and the fourth interface of the fifth switching valve is connected with the outlet of the fourth chromatographic column through an air pipeline.

Optionally, the first and second switching valves are ten-way switching valves.

Optionally, the third switching valve and the fourth switching valve are six-way switching valves.

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

Optionally, the first chromatographic column, the third chromatographic column, the fifth chromatographic column and the sixth chromatographic column are all high molecular polymer chromatographic columns.

Optionally, the second chromatography column and the fourth chromatography column are both molecular sieve chromatography columns.

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

the invention provides a sulfur hexafluoride nitrogen mixed gas decomposition product analysis system which comprises a first switching valve, a second switching valve, a third switching valve, a fourth switching valve, a fifth switching valve, a first quantitative ring, a second quantitative ring, a third quantitative ring, a first chromatographic column, a second chromatographic column, a third chromatographic column, a fourth chromatographic column, a fifth chromatographic column, a sixth chromatographic column, a first needle valve, a second needle valve, a third needle valve, a fourth needle valve, a first pulse discharge helium ionization detector and a second pulse discharge helium ionization detector. The method can realize 16 component analysis of hydrogen, oxygen, carbon monoxide, carbon tetrafluoride, methane, nitrogen trifluoride, carbon dioxide, nitrous oxide, hexafluoroethane, sulfuryl fluoride, hydrogen sulfide, octafluoropropane, thionyl fluoride, carbonyl sulfide, sulfur dioxide, carbon disulfide and the like in the sulfur hexafluoride nitrogen mixed gas, adopts a center cutting and back flushing separation technology, has no interference peak 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 ppb 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 nitrogen mixed gas decomposition product analysis system according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a sample injection state of a sulfur hexafluoride nitrogen mixed gas decomposition product analysis system according to an embodiment of the present invention;

FIG. 3 is a schematic view showing the state of purging of a sulfur hexafluoride nitrogen gas mixture decomposition product analysis system according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of the detection and analysis of the status of nitrous oxide hexafluoroethane in carbon dioxide according to the present invention.

Description of the symbols: 1-a first switching valve; 2-a second switching valve; 3-a third switching valve; 4-a fourth switching valve; 5-a fifth switching valve; 6-a first quantity of rings; 7-a second quantification loop; 8-a third quantitation loop; 9-sample inlet; 10-sample outlet; 11-a first chromatography column; 12-a second chromatography column; 13-third chromatography column; 14-a fourth chromatography column; 15-a fifth chromatographic column; 16-a sixth chromatographic column; 17-a first carrier gas; 18-a second carrier gas; 19-a third carrier gas; 20-a fourth carrier gas; 21-a first needle valve; 22-a seventh carrier gas; 23-a third needle valve; 24-a fourth needle valve; 25-a sixth carrier gas; 26-a second needle valve; 27-a fifth carrier gas; 28-a first pulsed discharge helium ionization detector; 29-second pulsed discharge helium ionizes the detector.

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.

Referring to fig. 1 to 4, a system for analyzing decomposition products of a sulfur hexafluoride nitrogen mixture gas includes: a first switching valve 1, a second switching valve 2, a third switching valve 3, a fourth switching valve 4, a fifth switching valve 5, a first dosing ring 6, a second dosing ring 7, a third dosing ring 8, a first chromatography column 11, a second chromatography column 12, a third chromatography column 13, a fourth chromatography column 14, a fifth chromatography column 15, a sixth chromatography column 16, a first needle valve 21, a second needle valve 26, a third needle valve 23, a fourth needle valve 24, a first pulsed discharge helium ionization detector 27, and a second pulsed discharge helium ionization detector 28.

The first interface of the first switching valve 1 is connected with the sample inlet 9 through an air channel pipeline, the second interface of the first switching valve 1 is connected with the first 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 sixth interface of the first switching valve 1 through an air channel pipeline, the second quantitative ring 7 is arranged on the air channel pipeline connected with the third interface of the first switching valve 1 and the sixth interface of the first switching valve 1, the fourth interface of the first switching valve 1 is connected with the second carrier gas 18 through an air channel pipeline, the fifth interface of the first switching valve 1 is connected with the inlet of the second chromatographic column 12 through an air channel pipeline, the seventh 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 first quantitative ring 6 is arranged on the air channel pipeline connected with the seventh interface of the first switching valve 1 and the tenth interface of the first switching valve 1, the eighth interface of the first switching valve 1 is connected with the inlet of the first chromatographic column 11 through a gas path pipeline, and the ninth interface of the first switching valve 1 is connected with the first carrier gas 17 through a gas path pipeline.

The second port of the second switching valve 2 is connected with the sample outlet 10 through an air channel pipeline, the third port of the second switching valve 2 is connected with the tenth port of the second switching valve 2 through an air channel pipeline, the third quantitative ring 8 is arranged on the air channel pipeline connecting the third port of the second switching valve 2 with the tenth port of the second switching valve 2, the fourth port of the second switching valve 2 is connected with the fourth carrier gas 20 through an air channel pipeline, the fifth port of the second switching valve 2 is connected with the first needle valve 21 through an air channel pipeline, the sixth port of the second switching valve 2 is connected with the ninth port of the second switching valve 2 through an air channel pipeline, the third chromatographic column 13 is arranged on the air channel pipeline connecting the sixth port of the second switching valve 2 with the ninth port of the second switching valve 2, the seventh port of the second switching valve 2 is combined with the outlet of the sixth chromatographic column 16 through an air channel pipeline, and the eighth port of the second switching valve 2 is connected with a third carrier gas 19 through a gas pipeline.

The first interface of the third switching valve 3 is connected with the second needle valve 26 through an air passage pipeline, the second interface of the third switching valve 3 is connected with a fifth carrier gas 2721 through an air passage pipeline, the third interface of the third switching valve 3 is connected with the inlet of the fifth chromatographic column 15 through an air passage pipeline, the fourth interface of the third switching valve 3 is connected with the outlet of the second chromatographic column 12 through an air passage pipeline, the fifth interface of the third switching valve 3 is connected with the inlet of the fourth chromatographic column 14 through an air passage pipeline, and the sixth interface of the third switching valve 3 is connected with a sixth carrier gas 25 through an air passage pipeline.

A first interface of the fourth switching valve 4 is directly connected with a third interface of the third switching valve 3 through an air passage pipeline, a second interface of the fourth switching valve 4 is connected with a third needle valve 23 through an air passage pipeline, a fourth interface of the fourth switching valve 4 is connected with a seventh carrier gas 22 through an air passage pipeline, a fifth interface of the fourth switching valve 4 is connected with an inlet of a sixth chromatographic column 16 through an air passage pipeline, and a sixth interface of the fourth switching valve 4 is connected with an outlet of the first chromatographic column 11 through an air passage pipeline.

A first interface of the fifth switching valve 5 is connected with a second pulse discharge helium ionization detector 28 through an air pipeline, a second interface of the fifth switching valve 5 is connected with an outlet of a fifth chromatographic column 15 through an air pipeline, a third interface of the fifth switching valve 5 is connected with a fourth needle valve 24 through an air pipeline, and a fourth interface of the fifth switching valve 5 is connected with an outlet of a fourth chromatographic column 14 through an air pipeline.

The first switching valve 1 and the second switching valve 2 are ten-way switching valves. The third switching valve 3 and the fourth switching valve 4 are six-way switching valves. The fifth switching valve 5 is a four-way valve.

The first chromatographic column 11, the third chromatographic column 13, the fifth chromatographic column 15 and the sixth chromatographic column 16 are all high molecular polymer chromatographic columns. The second chromatographic column 12 and the fourth chromatographic column 14 are both molecular sieve chromatographic columns.

The working principle is as follows: sampling: the sample sequentially passes through a sample inlet 9, a first interface, a tenth interface, a first quantitative ring 6, a seventh interface, a sixth interface, a second quantitative ring 7 and a third interface of the first switching valve 1, and is finally connected to the first interface, the tenth interface, the third quantitative ring 8 and the third interface of the second switching valve 2 from the second interface of the first switching valve 1, and is finally discharged from the sample outlet 8 from the second interface of the second switching valve 2.

The analysis process comprises the following steps: the first switching valve 1 is switched to the state shown in fig. 2, the first carrier gas 17 carries the sample in the first quantitative ring 6 to enter the first chromatographic column 11, the sample is discharged from a needle valve 23 in the switching valve 4 after being pre-separated by the first chromatographic column 11, when sulfuryl fluoride is pre-separated from the first chromatographic column 11, the fourth switching valve 4 is switched to the state shown in fig. 3, the sulfuryl fluoride, hydrogen sulfide, octafluoropropane, carbonyl sulfide and thionyl fluoride are separated from the sixth chromatographic column 16 and detected by a first pulse discharge helium ionization detector 28.

Switching the second switching valve 2 to the state shown in fig. 2, the fourth carrier gas 20 carrying the sample in the third measuring ring 8 enters the third chromatographic column 13, when the sulfur hexafluoride, hydrogen, oxygen, nitrogen, carbon monoxide and other components are separated from the third chromatographic column 13 and then discharged through the needle valve 21, when the sulfur dioxide is separated from the third chromatographic column 13, the second switching valve 2 is reset to the state shown in fig. 1, and the third carrier gas 19 carrying the sulfur dioxide and carbon disulfide in the third chromatographic column 13 is detected by the first pulse discharge helium ionization detector 28.

The first switching valve 1 is switched to the state of fig. 2, the second carrier gas 18 carries the sample in the second quantitative ring 7 into the second chromatographic column 12, when the hydrogen and oxygen completely enter the fourth chromatographic column 14 from the second chromatographic column 12, the hydrogen and oxygen are detected by the second pulse discharge helium ionization detector 29, while the nitrogen is still stored in the fourth chromatographic column 14, the third switching valve 3 is switched to the state of fig. 4, and the nitrogen is discharged from the fourth needle valve 24.

Switching first switching valve 1 to the state of fig. 4, second carrier gas 18 carries carbon monoxide methane nitrogen trifluoride carbon dioxide nitrous oxide hexafluoroethane in second chromatographic column 12, and switching third switching valve 3 to the state of fig. 4, carbon monoxide methane nitrogen trifluoride carbon dioxide nitrous oxide hexafluoroethane is detected by second pulse discharge helium ionization detector 29. When the sulphur hexafluoride in the fifth chromatographic column 15 is separated from the fifth chromatographic column 15, the fifth switching valve 5 is switched to the state shown in fig. 1, and the fifth carrier gas 27 carrying the sulphur hexafluoride in the fifth chromatographic column 15 is discharged from the fourth needle valve 24.

The method can realize 16 component analysis of hydrogen, oxygen, carbon monoxide, carbon tetrafluoride, methane, nitrogen trifluoride, carbon dioxide, nitrous oxide, hexafluoroethane, sulfuryl fluoride, hydrogen sulfide, octafluoropropane, thionyl fluoride, carbonyl sulfide, sulfur dioxide, carbon disulfide and the like in the sulfur hexafluoride nitrogen mixed gas, adopts a center cutting and back flushing separation technology, has no interference peak 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 ppb level.

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.