Gas chromatography system and method for detecting low-concentration sulfide

Abstract

The invention provides a gas chromatography system and a method for detecting low-concentration sulfides, which are characterized in that a high-low temperature transmission system is arranged, the characteristics that a desorption tube adsorbs the low-concentration sulfides under a low-temperature condition and desorbs the sulfides under a high-temperature condition are utilized, and a pulse helium ionization detector (PDD) in a gas chromatograph is combined to detect the low-concentration sulfides. Detection of the sulfide ppb level is achieved, and guarantee is provided for safe operation of power equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of detection of discharge decomposition products in SF6 gas, in particular to a detection system and method for low-concentration sulfide gas chromatography. BACKGROUND

[0002] With the rapid development of power grids, the reliability of safe power supply is increasingly required. The safe and reliable operation of ultra-high voltage equipment plays a very key role in the power supply reliability of urban power supply systems. At present, domestic high-voltage equipment often uses insulating materials, mainly transformer insulating oil used by ultra-high voltage transformers and sulfur hexafluoride (SF6) gas used by gas insulated switchgear (GIS) and other equipment. The detection of discharge decomposition products in SF6 can detect latent faults existing in the internal of the gassed power equipment in advance, and the sulfide decomposition product is one of the important detection items.

[0003] Related research shows that when discharge, abnormal heating and other defects occur in GIS, SF6 will decompose to generate gas decomposition products. Detecting the composition of SF6 gas decomposition products in the internal of the equipment is of great significance for equipment fault positioning and diagnosis of some latent defects, and is widely used in equipment operation and maintenance. For ultra-high voltage GIS, due to its large gas chamber and the presence of adsorbents, the concentration of decomposition products generated by latent defects in the equipment is usually lower than the minimum detection limit of the on-site detection instrument. Therefore, a detection device capable of detecting trace amounts of SF6 gas decomposition product components is an important means for diagnosing GIS equipment defects.

[0004] At present, common methods for analyzing and detecting SF6 decomposition products at home and abroad include gas chromatography, infrared absorption spectroscopy, mass spectrometry, detection tube method, ion mobility spectrometry, etc. However, in the face of the continuous reduction of sulfide detection concentration, these methods either cannot meet the detection limit requirement and can only achieve ppm-level measurement, or the instruments are too expensive, which limits the safe and reliable operation of the power grid.

[0005] The mixed heat pump device provided by the above technical scheme generates the refrigerant and the absorbent required by the heat pump circulating system by absorbing external heat to make the solution inside the generator boil. However, the heat transfer efficiency of the existing generator is low, resulting in low heat pump operation efficiency. SUMMARY

[0006] In view of this, the present application provides a gas chromatography system for detecting low-concentration sulfide, comprising:

[0007] The gas chromatograph is provided with two analytical tubes, analytical tube 1 and analytical tube 2, three chromatographic columns, column 1, column 2 and column 3, and a corresponding helium ionization detector (PDD). The analytical tubes can pretreat the sample entering the gas chromatograph to convert it into a gaseous state. The chromatographic columns separate different components in the sample pretreated by the analytical tubes. After detection by the helium ionization detector (PDD), the separated components are converted into electrical signals, which are subjected to quantitative and qualitative analysis by a chromatogram.

[0008] The high-low temperature transmission system comprises a high-temperature analysis system, a low-temperature enrichment system and a transmission device. The high-temperature analysis system and the low-temperature enrichment system are arranged at a preset distance. The transmission device is arranged on one side of the high-temperature analysis system and is provided with an extension tube on the side close to the high-temperature analysis system. The extension tube can extend through the high-temperature analysis system and reach the low-temperature enrichment system. Two analytical tubes can be placed in the extension tube. First, low-concentration sulfides are enriched in the low-temperature enrichment system. After enrichment, the analytical tubes are moved to the high-temperature analysis system through the extension tube for analysis. Then, the gas chromatograph is used to detect the analyzed gas.

[0009] Further, the high-low temperature transmission system further comprises a mounting plate. The transmission device, the high-temperature analysis system and the low-temperature enrichment system are fixedly arranged on the mounting plate at a preset distance.

[0010] Further, the low-temperature enrichment system comprises an enrichment device and a refrigeration system arranged thereon. The refrigeration system comprises a refrigeration sheet, a hot end heat dissipation sheet and a heat dissipation fan arranged in sequence from bottom to top. The refrigeration sheet is attached to the upper surface of the enrichment device. The refrigeration system can cool the enrichment device to maintain a preset low-temperature environment. When the two analytical tubes are in the low-temperature enrichment system, they are placed in the enrichment device.

[0011] Further, in the high-temperature analysis system, the temperature is 50-100℃.

[0012] Further, in the low-temperature enrichment system, the temperature is -20- -10℃.

[0013] Further, the high-temperature analysis system is a high-temperature analysis furnace.

[0014] Further, the column 1 and the column 2 are highly cross-linked styrene-divinylbenzene copolymers, both of which are nitric acid treated carriers. The column 3 is a porous polymer microsphere.

[0015] Further, the adsorbents in the two analytical tubes are styrene, divinylbenzene and vinylpyrrolidone copolymers.

[0016] The application provides a low-concentration sulfide detection gas chromatography system, which has the following advantages: the disclosed gas chromatography system is added with a high-low temperature transmission system on the basis of a traditional gas chromatograph, can enrich low-concentration sulfides under low-temperature conditions, and analyzes the sulfides under high-temperature conditions, realizes the analysis of the entire system on low-concentration sulfides, realizes the detection of sulfides at the ppb level, and provides protection and optional equipment for the safe operation of power equipment.

[0017] Another aspect of the application also discloses a low-concentration sulfide detection gas chromatography method, which applies the low-concentration sulfide detection gas chromatography system according to any one of the above.

[0018] Sulfide enrichment: the analysis tube 1 and the analysis tube 2 are placed in the low-temperature enrichment system, the gas chromatograph is started to pass in SF6 standard gas, and then the sample is passed in, and the sulfide enrichment is carried out under low-temperature conditions.

[0019] Sample analysis: the two analysis tubes are closed, and are transmitted to the high-temperature analysis system by using a transmission device, and the sample analysis is carried out under high-temperature conditions.

[0020] SO2F2, H2S and COS analysis: the sample in the analysis tube 1 enters the column 3 with the carrier gas, the sample in the analysis tube 2 enters the column 1 and the column 2 with the carrier gas in sequence, and the sample enters the helium ionization detector (PDD), and SO2F2, H2S and COS are analyzed.

[0021] SO2 and CS2 analysis: when the COS in the analysis tube 2 is out of the peak, the remaining sample is vented, the sample in the column 3 enters the helium ionization detector (PDD), and SO2 and CS2 are analyzed.

[0022] Further, the sulfide enrichment is achieved by using the method of adsorption analysis to make the analysis tube adsorb sulfides under low-temperature conditions, so that the enrichment effect of low-concentration sulfides is achieved.

[0023] Further, the sample is a sulfide-containing gas.

[0024] The application provides a low-concentration sulfide detection gas chromatography method, which has the following advantages: the application utilizes the characteristics that the analysis tube adsorbs sulfides under low-temperature conditions and desorbs sulfides under high-temperature conditions, combines the pulse helium ionization detector (PDD) in the gas chromatograph and the high-low temperature transmission system, realizes the detection of sulfides at the ppb level, and provides protection and optional equipment for the safe operation of power equipment. BRIEF DESCRIPTION OF DRAWINGS

[0025] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments with reference made to the accompanying drawings. The drawings are for purposes of illustration only and are not intended to be limiting in any respect. Furthermore, where used in the drawings, like reference numerals have been used to indicate like or similar portions for the preferred embodiments. In the drawings:

[0026] Figure 1 A step chart of a method for detecting low concentration sulfide by gas chromatography provided for the embodiments of the present application;

[0027] Figure 2 A flow chart of a low temperature enrichment sampling provided for the embodiments of the present application;

[0028] Figure 3 A structural schematic diagram of a low temperature enrichment device provided for the embodiments of the present application;

[0029] Figure 4 A flow chart of a high temperature sample desorption provided for the embodiments of the present application;

[0030] Figure 5 A structural schematic diagram of a high temperature desorption device provided for the embodiments of the present application;

[0031] Figure 6 A flow chart of SO2F2, H2S and COS analysis provided for the embodiments of the present application;

[0032] Figure 7 A flow chart of SO2 and CS2 analysis provided for the embodiments of the present application;

[0033] In the drawings, 1 is a switching valve 1; 2 is a switching valve 2; 3 is a switching valve 3; 4 is a switching valve 4; 5 is a helium ionization detector (PDD); 6 is a carrier gas 1; 7 is a carrier gas 2; 8 is a carrier gas 3; 9 is a sample inlet; 10 is a sample outlet; 11 is a desorption tube 1; 12 is a desorption tube 2; 13 is a needle valve 1; 14 is a needle valve 2; 15 is a column 1; 16 is a column 2; 17 is a column 3; 18 is a mounting plate; 19 is a transmission device; 20 is a high temperature desorption system (a high temperature desorption furnace); 21 is an expansion tube; 22 is a desorption tube; 23 is a heat dissipation fan; 24 is a hot end heat dissipation fin; 25 is a refrigeration fin; and 26 is an enrichment device. DETAILED DESCRIPTION

[0034] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art. It should be noted that the embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0035] Referring to Figures 2-7 As shown, a low-concentration sulfide detection gas chromatography system provided by an embodiment of the present disclosure includes:

[0036] The gas chromatograph is provided with two analytical tubes, namely analytical tube 1 (11) and analytical tube 2 (12), three chromatography columns, namely column 1 (15), column 2 (16) and column 3 (17), and a corresponding helium ionization detector PDD (5). The analytical tubes can pretreat samples entering the gas chromatograph to convert them into a gaseous state. The chromatography columns separate different components in the pretreated samples. After detection by the helium ionization detector (PDD), the separated components are converted into an electrical signal, which is subjected to quantitative and qualitative analysis by a chromatogram.

[0037] The high-low temperature transmission system includes a high-temperature analytical system (20), a low-temperature enrichment system and a transmission device (19). The high-temperature analytical system (20) and the low-temperature enrichment system are sequentially and at a preset distance. The transmission device (19) is arranged on one side of the high-temperature analytical system (20) and is provided with an extension tube (21) near the side of the high-temperature analytical system (20). The extension tube (21) can extend through the high-temperature analytical system (20) and reach the low-temperature enrichment system. The two analytical tubes can be placed in the extension tube (21). First, low-concentration sulfides are enriched in the low-temperature enrichment system. After enrichment, the extension tube (21) is moved to the high-temperature analytical system (20) for analysis. Then, the gas chromatograph is used to detect the analyzed gas.

[0038] Referring to Figure 3 , 5 As shown, the high-low temperature transmission system further includes a mounting plate (18). The transmission device (19), the high-temperature analytical system (20) and the low-temperature enrichment system are sequentially and at a preset distance fixedly arranged on the mounting plate (18).

[0039] Continuing to refer to Figure 3 , 5As shown, the low-temperature enrichment system comprises an enrichment device (26) and a refrigeration system arranged thereon, the refrigeration system comprises, from bottom to top, a refrigeration sheet (25), a hot-end heat dissipation sheet (24) and a heat dissipation fan (23) arranged in sequence, the refrigeration sheet (25) is arranged on the upper surface of the enrichment device (26), the refrigeration system can refrigerate the enrichment device (26) to keep a preset low-temperature environment in the enrichment device (26), and the two analysis pipes are arranged in the enrichment device (26) when in the low-temperature enrichment system.

[0040] In this embodiment, the temperature in the high-temperature analysis system (20) is 50-100 DEG C.

[0041] In this embodiment, the temperature in the low-temperature enrichment system is -20-10 DEG C.

[0042] In this embodiment, the high-temperature analysis system (20) is a high-temperature analysis furnace.

[0043] In this embodiment, the column 1 and the column 2 are highly cross-linked styrene-divinylbenzene copolymers, both of which are nitric acid treated carriers, and the column 3 is a porous polymer microsphere.

[0044] In this embodiment, the adsorbents in the two analysis pipes are styrene, divinylbenzene and vinylpyrrolidone copolymers.

[0045] The low-concentration sulfide gas chromatography system provided by the application has the following advantages: the disclosed gas chromatography system of the application adds a high-low temperature transmission system on the basis of a traditional gas chromatograph, can enrich low-concentration sulfides in the analysis pipes under low-temperature conditions, analyzes under high-temperature conditions, realizes the analysis of low-concentration sulfides by the whole system, realizes the detection of sulfides at the ppb level, and provides protection and optional equipment for the safe operation of power equipment.

[0046] Another embodiment of the application also discloses a low-concentration sulfide gas chromatography method, which applies the low-concentration sulfide gas chromatography system according to any one of the above embodiments, and refers to Figures 1-7 As shown, comprising:

[0047] S01, sulfide enrichment, the analysis pipe 1 (11) and the analysis pipe 2 (12) are placed in the low-temperature enrichment system, the gas chromatograph is started to introduce SF6 standard gas, then sample gas is introduced, and sulfide enrichment is carried out under low-temperature conditions;

[0048] S02, sample analysis, the two analysis pipes are closed, the transmission device (19) is used to transfer into the high-temperature analysis system (20), and sample analysis is carried out under high-temperature conditions;

[0049] SO2F2, H2S and COS analysis, sample in desorption tube 1 (11) enters column 3 (17) with carrier gas, sample in desorption tube 2 (12) enters column 1 (15) and column 2 (16) with carrier gas in sequence, sample enters helium ionization detector PDD (5) for SO2F2, H2S and COS analysis;

[0050] SO2 and CS2 analysis, when COS in desorption tube 2 (12) is out of peak, the remaining sample is vented, sample in column 3 (17) enters helium ionization detector PDD (5) for SO2 and CS2 analysis.

[0051] Further, the sulfide enrichment is achieved by using the method of adsorption desorption, so that the desorption tube can adsorb sulfides under low temperature conditions, thereby achieving the enrichment effect of low concentration sulfides.

[0052] Further, the sample is a gas containing sulfides.

[0053] A preferred embodiment of the online detection of low concentration sulfides by gas chromatography method is as follows, referring to Figures 1-7 The preferred embodiment is as follows:

[0054] Step 1: Desorption tube 1 (11) and desorption tube 2 (12) are in enrichment device (26) by default, SF6 standard gas is opened, and sulfides are enriched at low temperature by switching valve 3 (3) sample inlet (9) sampling;

[0055] Step 2: Switching valve 3 (3) is opened to form a closed state of desorption tube 1 (11) and desorption tube 2 (12), and at the same time, desorption tube 1 (11) and desorption tube 2 (12) are transferred to high temperature desorption furnace (20) through telescopic tube (21) in transmission device (19) to desorb the sample;

[0056] Step 3: Switching valve 1 (1) is opened, sample in desorption tube 1 (11) enters column 3 (17) with carrier gas 1 (6), and the remaining sample is vented through needle valve 2 (14); sample in desorption tube 2 (12) enters column 1 (15) and column 2 (16) with carrier gas 2 (7) in sequence, and then enters pulse helium ionization detector PDD (5) for SO2F2, H2S and COS analysis;

[0057] Step 4: When COS in desorption tube 2 (12) is out of peak, switching valve 2 (2) is switched to vent the remaining sample through needle valve 1 (13); at the same time, switching valve 4 (4) is switched to make sample in column 3 (17) enter pulse helium ionization detector PDD (5) for SO2 and CS2 analysis. The present application uses low temperature adsorption of low concentration sulfides, and high temperature desorption of sulfides, and cooperates with automatic transmission device (19), so that the detection of low concentration sulfides can be realized, and the online monitoring level of sulfide content in SF6 decomposition products of extra-high voltage insulation gas is improved.

[0058] The embodiment utilizes low-temperature adsorption of low-concentration sulfides and high-temperature desorption of the sulfides, and cooperates with an automatic transmission device (19), so that the detection of low-concentration sulfides is realized, and the online monitoring level of the sulfide content in the ultra-high voltage insulation gas SF6 decomposition products is improved.

[0059] The purpose of the present application is to provide a gas chromatography method for detecting low-concentration sulfides, and the process comprises: the desorption tubes 1 (11) and 2 (12) are in the enrichment device (26) by default, the SF6 standard gas is opened, and the low-temperature enrichment of sulfides is carried out by sampling through the sample inlet (9) of the switching valve 3 (3); step 2: the switching valve 3 (3) is opened, forming a closed state of the desorption tubes 1 (11) and 2 (12), and at the same time, the desorption tubes 1 (11) and 2 (12) are transferred to the high-temperature desorption furnace (20) through the telescopic tube (21) in the high-low temperature transmission device (19) to desorb the sample; step 3: the switching valve 1 (1) is opened, the sample in the desorption tube 1 (11) enters the column 3 (17) with the carrier gas 1 (6), and is vented through the needle valve 2 (14); the sample in the desorption tube 2 (12) enters the column 1 (15) and 2 (16) with the carrier gas 2 (7) in turn, and then enters the pulse helium ionization detector PDD (5) to analyze SO2F2, H2S and COS; step 4: when the COS in the desorption tube 2 (12) peaks, the switching valve 2 (2) is switched to vent the remaining sample through the needle valve 1 (13); at the same time, the switching valve 4 (4) is switched to make the sample in the column 3 (17) enter the pulse helium ionization detector PDD (5) to analyze SO2 and CS2.

[0060] In step 1, the desorption tube is used to adsorb the sulfides under low-temperature conditions by using the adsorption and desorption method, so as to achieve the effect of sulfide enrichment.

[0061] In step 2, the high-low temperature transmission device (19) is added into the gas chromatograph, the conversion of the desorption tubes 1 (11) and 2 (12) between high and low temperatures is realized through a remote control device, the high-temperature desorption of the sulfides is realized, and the detection of low-concentration sulfides is realized.

[0062] The lowest concentration of the present application can reach the level of 1 ppb, the sulfides can be analyzed and detected by the direct sampling method, and it is a clean and efficient detection method.

[0063] As Figure 3 , 5The installation plate (18) is located at the bottom end of the enrichment device, and serves as a fixed support. The enrichment device (26) and the high-temperature analysis furnace are fixed on the installation plate (18), and the high-low temperature transmission device (19) is arranged on the left side, connected with the telescopic pipe (4), and the analysis pipe (5) is located at the top end of the telescopic pipe (4), and the high temperature and low temperature conversion can be realized through the telescopic pipe. The enrichment device (26) is provided with a refrigeration fin (25) above the enrichment device (26) for refrigeration. The upper side of the refrigeration fin (25) is provided with a hot end heat dissipation fin (24) and a heat dissipation fan (23) for heat dissipation of the refrigeration fin (25).

[0064] As Figure 2 , in step 1, the analysis pipe 1 (11) and the analysis pipe 2 (12) are in the default state of being refrigerated by the enrichment device (26) through the refrigeration fin (25) (as Figure 2 ), and the time and temperature are set through the chromatograph control interface. After the set value is reached, the sample enters the analysis pipe 1 (11) and the analysis pipe 2 (12) from the sample inlet (9) in sequence, and reaches the enrichment effect from the sample outlet (10);

[0065] As Figure 4 , in step 2, the switching valve 3 (3) is opened to form a closed state of the analysis pipe, and the analysis pipe 1 (11) and the analysis pipe 2 (12) are transferred from the enrichment device (26) to the high-temperature analysis furnace (20) through the transmission device (19) and the telescopic pipe (21) for analysis (as Figure 4 ), and the time and temperature are set through the chromatograph control interface, and the absorbed impurity components are completely analyzed;

[0066] As Figure 6 , step 3: the switching valve 1 (1) is opened, the sample in the analysis pipe 1 (11) enters the column 3 (17) with the carrier gas 1 (6), and is emptied through the needle valve 2 (14); the sample in the analysis pipe 2 (12) enters the column 1 (15) and the column 2 (16) with the carrier gas 2 (7) in sequence, and then enters the pulse helium ionization detector PDD (5) to analyze SO2F2, H2S and COS;

[0067] As Figure 7 , step 4: when the COS in the analysis pipe 2 (12) peaks, the switching valve 2 (2) is switched to empty the remaining sample through the needle valve 1 (13); at the same time, the switching valve 4 (4) is switched to make the sample in the column 3 (17) enter the pulse helium ionization detector PDD (5) to analyze SO2 and CS2.

[0068] The application provides a method for detecting low-concentration sulfide by gas chromatography, which has the following advantages: the method utilizes the characteristics of the resolving tube in adsorbing sulfide under low-temperature conditions and desorbing sulfide under high-temperature conditions, and combines a pulse helium ionization detector (PDD) in a gas chromatograph and a high-low temperature transmission system, so that the detection of ppb-level sulfide is realized, and the safe operation of power equipment is ensured.

[0069] It should be noted that, in the description of the present application, the terms indicating the direction or position relationship of "upper", "lower", "left", "right", "inner", "outer" and the like are based on the direction or position relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0070] In addition, it should also be noted that, in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0071] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A low concentration sulfide detection gas chromatography system characterized by, The system comprises: a gas chromatograph, which is provided with two analytical tubes, namely analytical tube 1 and analytical tube 2, three chromatographic columns, namely column 1, column 2 and column 3, and a corresponding helium ionization detector (PDD), the analytical tubes can pretreat the sample entering the gas chromatograph to convert it into a gaseous state, the chromatographic columns separate different components in the sample pretreated by the analytical tubes, the separated components are converted into electrical signals after being detected by the helium ionization detector (PDD), and quantitative and qualitative analysis is performed through a chromatogram; a high-low temperature transmission system, which comprises a high-temperature analytical system, a low-temperature enrichment system and a transmission device, the high-temperature analytical system and the low-temperature enrichment system are sequentially and spaced apart by a preset distance, the transmission device is arranged on one side of the high-temperature analytical system, a telescopic pipe is arranged on the side of the transmission device close to the high-temperature analytical system, the telescopic pipe can extend through the high-temperature analytical system and reach the low-temperature enrichment system, the two analytical tubes can be arranged in the telescopic pipe, low-concentration sulfides are first enriched in the low-temperature enrichment system, after the enrichment is completed, the two analytical tubes are moved to the high-temperature analytical system through the telescopic pipe to perform analysis, and then the gas after the analysis is detected by the gas chromatograph.

2. The low concentration sulfide detection gas chromatograph system of claim 1, wherein, The high-low temperature transmission system further comprises a mounting plate, the transmission device, the high-temperature analytical system and the low-temperature enrichment system are sequentially and spaced apart by a preset distance and fixedly arranged on the mounting plate.

3. The low concentration sulfide detection gas chromatograph system of claim 1, wherein, The low-temperature enrichment system comprises an enrichment device and a refrigeration system arranged thereon, the refrigeration system comprises, from bottom to top, a refrigeration sheet, a hot end heat dissipation sheet and a heat dissipation fan which are sequentially and superposedly arranged, the refrigeration sheet is attached to the upper surface of the enrichment device, the refrigeration system can refrigerate the enrichment device to keep a preset low-temperature environment in the enrichment device, and the two analytical tubes are arranged in the enrichment device when they are in the low-temperature enrichment system.

4. The low concentration sulfide detection gas chromatograph system of claim 1, wherein, In the high-temperature analytical system, the temperature is 50-100°C.

5. The low concentration sulfide detection gas chromatograph system of claim 1, wherein, In the low-temperature enrichment system, the temperature is -20- -10°C.

6. The low concentration sulfide detection gas chromatograph system of claim 1, wherein, The high-temperature analytical system is a high-temperature analytical furnace.

7. The low concentration sulfide detection gas chromatograph system of claim 1, wherein, The column 1 and the column 2 are highly cross-linked styrene-divinylbenzene copolymers, and the column 3 is a porous polymer microsphere.

8. The low concentration sulfide detection gas chromatograph system of claim 1, wherein, The adsorbents in the two analytical tubes are styrene, divinylbenzene and vinylpyrrolidone copolymers.

9. A method for detecting low concentrations of sulfides by gas chromatography, characterized in that, The detection system for low-concentration sulfides according to any one of claims 1-8 comprises: sulfide enrichment, analytical tube 1 and analytical tube 2 are placed in the low-temperature enrichment system, SF6 standard gas is introduced into the gas chromatograph, then sample is introduced, and sulfide enrichment is performed under low-temperature conditions; sample analysis, the two analytical tubes are closed, and the transmission device is used to transfer the two analytical tubes to the high-temperature analytical system to perform sample analysis under high-temperature conditions; SO2F2, H2S and COS analysis, the sample in analytical tube 1 enters column 3 with the carrier gas, the sample in analytical tube 2 enters column 1 and column 2 with the carrier gas, and the sample enters the helium ionization detector (PDD) to analyze SO2F2, H2S and COS; SO2 and CS2 analysis, while the sample in column 3 is analyzed for SO2 and CS2 by venting the remaining sample in desorption tube 2 and passing the sample in column 3 to a helium ionization detector (PDD).

10. The method of claim 9, wherein the low concentration sulfide gas chromatography method is characterized by, The sulfide enrichment is performed by adsorption desorption using a desorption tube that adsorbs sulfides at low temperature.

11. The method of claim 9, wherein the low concentration sulfide gas chromatography method is characterized by, The sample is a gas containing sulfides.

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