Acid gas analysis gas chromatograph

Abstract

The utility model discloses a gas chromatograph for acid gas analysis. The gas chromatograph comprises a sample introduction system, a separation system and a thermal conductivity detector, the sample introduction system and the thermal conductivity detector are connected to the separation system; the separation system comprises a first separation system and a second separation system which are arranged in parallel; a ten-way valve is arranged in each of the first separation system and the second separation system; the ten-way valve of the first separation system is connected with the ten-way valve of the second separation system through a pipeline, the ten-way valve of one separation system is connected with a sample injection system, and the ten-way valve of the other separation system is connected with an external recovery system; and the first separation system and the second separation system are respectively connected with a thermal conductivity detector. According to the gas chromatograph, the analysis of H2, O2, N2, CH4, CO, CO2, H2S, COS and SO2 in the acid gas can be completed within 10 minutes through one-time sample injection, the situation that the analysis result is inaccurate due to system errors caused by multiple times of sample injection is avoided, the time for an operator to make contact with a sample is shortened, and occupational health safety is effectively provided.

Description

Technical Field

[0001] This utility model relates to the field of gas chromatography for acidic gas analysis, and specifically to a gas chromatograph for acidic gas analysis. Background Technology

[0002] The composition of acidic gases produced by natural gas purification and desulfurization processes in natural gas chemical and coal chemical industries varies, but they generally contain large amounts of several or all of the following substances: H2, O2, N2, CH4, CO, CO2, H2S, COS, SO2, and CS2. Currently, two chromatographs are typically used for analysis: one analyzes H2, O2, N2, CH4, CO, and CO2, while the other analyzes H2S, COS, SO2, and CS2.

[0003] Because acidic gases are flammable, explosive, toxic, harmful, and corrosive, frequent and prolonged contact with samples by operators poses laboratory safety hazards and may damage their health.

[0004] The existing method of using two gas chromatographs to analyze acidic gases has two problems:

[0005] Problem 1: Multiple injections, long analysis time, and significant safety hazards. The existing two-gas-chromatograph setup requires two injections. This not only increases the frequency and duration of operator contact with samples, potentially increasing the probability of safety accidents, but also prolongs the analysis time, reducing the timeliness of the analytical results in guiding production processes.

[0006] Problem 2: Inaccurate analytical results and short instrument lifespan. The existing two gas chromatograph setups suffer from inaccurate analytical results and reduced instrument lifespan due to water in the sample interfering with the separation of H2S or SO2. Utility Model Content

[0007] To address the aforementioned shortcomings of existing technologies, an acid gas analyzer is provided, which not only shortens the analysis time and number of analyses but also improves the accuracy of analytical results and extends the instrument's service life.

[0008] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0009] An acid gas analyzer includes an injection system, a separation system, and a thermal conductivity detector; both the injection system and the thermal conductivity detector are connected to the separation system.

[0010] The separation system includes a first separation system and a second separation system connected in parallel. Both the first and second separation systems are equipped with a ten-way valve. The ten-way valves of the first and second separation systems are connected by pipelines. The ten-way valve of one separation system is connected to the sample injection system, and the ten-way valve of the other separation system is connected to the external recovery system. Each of the first and second separation systems is connected to a thermal conductivity detector.

[0011] According to the above technical solution, both the first separation system and the second separation system further include a metering ring and a pre-separation column connected to the ten-way valve at both ends, as well as a main separation column, a first carrier gas branch, a second carrier gas branch and an venting branch connected to the ten-way valve at one end; the other end of the main separation column is connected to a thermal conductivity detector.

[0012] The ten-way valve has two states. In one state, one end of the metering loop is connected to the metering loop on another ten-way valve, and the other end of the metering loop is connected to the injection system or external recovery system. The two ends of the pre-separation column are connected to the first carrier gas branch and the venting branch, and the second carrier gas branch is connected to the main separation column.

[0013] In another configuration, the two ends of the metering loop are connected to the first carrier gas branch and the pre-separation column; the two ends of the pre-separation column are connected to the metering loop and the main separation column, and the second carrier gas branch and the venting branch are connected.

[0014] According to the above technical solution, the ten-way valve of the first separation system includes ten connection points, A1~A10; the injection system is connected to A10, the two ends of the quantitative loop are connected to A1 and A8, the two ends of the pre-separation column are connected to A2 and A6, the vent branch is connected to A3, the second carrier gas branch is connected to A4, the main separation column is connected to A5, and the first carrier gas branch is connected to A7.

[0015] The ten-way valve of the second separation system includes ten connection points, B1~B10; the connection point A9 of the ten-way valve of the first separation system is connected to the connection point B10 of the ten-way valve of the second separation system through a pipeline; the two ends of the metering loop are connected to B1 and B8; the two ends of the pre-separation column are connected to B2 and B6; the vent branch is connected to B3; the second carrier gas branch is connected to B4; the main separation column is connected to B5; the first carrier gas branch is connected to B7; and the external recovery system is connected to B9.

[0016] According to the above technical solution, a third carrier gas branch is connected to the thermal conductivity detector as a reference gas path for the thermal conductivity detector.

[0017] According to the above technical solution, the first carrier gas branch, the second carrier gas branch and the third carrier gas branch of the first separation system all use high-purity argon as the carrier gas.

[0018] The first, second, and third carrier gas branches of the second separation system all use high-purity helium or high-purity hydrogen as carrier gas.

[0019] According to the above technical solution, the pre-separation column of the first separation system adopts a polymer porous microsphere column, and the main separation column of the first separation system adopts a molecular sieve column.

[0020] The pre-separation column of the second separation system uses a polymer porous microsphere column, and the main separation column of the second separation system uses a special column for acidic gases.

[0021] According to the above technical solution, the carrier gas branch includes a gas source, a pipeline connected to the gas source, and a switch valve installed on the pipeline.

[0022] Alternatively, the carrier gas branch includes a gas source, a pipe connected to the gas source, and a switch valve and a damping column installed on the pipe, with the damping column located between the switch valve and the connection point.

[0023] Alternatively, the carrier gas branch includes a gas source, a pipe connected to the gas source, and a switching valve and a damping structure installed on the pipe, with the damping structure located between the switching valve and the connection point.

[0024] According to the above technical solution, the venting branch includes a pipeline and a damping column installed on the pipeline.

[0025] According to the above technical solution, the ten-way valve of the first separation system is connected to the sample injection system, and the ten-way valve of the second separation system is connected to the external recovery system.

[0026] According to the above technical solution, the ten-way valve of the second separation system is connected to the sample injection system, and the ten-way valve of the first separation system is connected to the external recovery system.

[0027] This utility model has the following beneficial effects:

[0028] 1. A first and second separation system are connected in parallel. The first separation system is used to analyze the constant amounts of H2, O2, N2, CH4, and CO in acidic gases, while the second separation system is used to analyze the constant amounts of CO2, H2S, COS, and SO2 in acidic gases. By connecting the ten-way valves of the two separation systems in series between the injection system and the external recovery system, synchronous injection of samples into both separation systems is achieved, allowing the analysis processes of both systems to proceed simultaneously. Therefore, this gas chromatograph can complete the analysis of H2, O2, N2, CH4, CO and CO2, H2S, COS, and SO2 in acidic gases within 10 minutes with a single injection, avoiding the inaccurate analytical results caused by systematic errors from multiple injections from multiple instruments, reducing operator contact time with samples, and effectively improving occupational health and safety.

[0029] 2. By setting a dedicated column for acidic gas as the main separation column in the second separation system, this invention enables water in the acidic gas to be analyzed to precipitate between H2S and SO2 without interfering with the separation of either, eliminating the interference of H2O on the separation of H2S and SO2, and improving the accuracy of H2S and SO2 analysis results; moreover, water does not co-distill with any sulfide, which reduces the corrosion of the thermal conductivity detector and extends the service life of the instrument.

[0030] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it according to the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. The specific implementation methods of this utility model are given in detail in the following embodiments and their accompanying drawings. Attached Figure Description

[0031] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0032] Figure 1 This is a schematic diagram of an embodiment provided by this utility model;

[0033] Figure 2 This utility model provides gas chromatograms of the first separation system connected to a thermal conductivity detector in application examples 1 and 2;

[0034] Figure 3 This utility model provides a gas chromatogram of the second separation system connected to a thermal conductivity detector in Application Example 1;

[0035] Figure 4 This utility model provides a gas chromatogram of the second separation system connected to a thermal conductivity detector in Application Example 2;

[0036] In the figure, 1. Sample introduction system; 2. Thermal conductivity detector; 3. Ten-way valve; 4. Quantitative loop; 5. Pre-separation column; 6. Main separation column; 6-1. Molecular sieve column; 6-2. Acid gas dedicated column; 7. First carrier gas branch; 8. Second carrier gas branch; 9. Exhaust branch; 10. Third carrier gas branch; 11. External recovery system. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1The principles and features of this utility model are described below. The examples given are for illustrative purposes only and are not intended to limit the scope of this utility model. The utility model is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of this utility model will become clearer from the following description and claims. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this utility model.

[0038] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or may also have an intervening component. When a component is considered to be "set on" another component, it can be directly set on the other component or may also have an intervening component.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0040] Reference Figure 1 As shown, the acid gas analyzer provided by this utility model includes an injection system 1, a separation system, and a thermal conductivity detector 2; both the injection system and the thermal conductivity detector are connected to the separation system.

[0041] This gas chromatograph is mainly used for analyzing acidic gases generated in natural gas purification and desulfurization processes in natural gas chemical and coal chemical industries. Acidic gases consist of two parts: one part is one, several, or all of H2, O2, N2, CH4, and CO; the other part is one, several, or all of CO2, H2S, COS, H2O, and SO2. This gas chromatograph can be used in desulfurization processes in the natural gas and coal chemical industries, and can be referenced to the following standards: GB / T 35212.1-2017 Gas and Solution Analysis and Evaluation Methods for Desulfurization, Decarbonization, and Sulfur Recovery in Natural Gas Purification Plants: Part 1 - Gas and Solution Analysis; and SY / T 6537-2016 Gas and Solution Analysis in Natural Gas Purification Plants.

[0042] Example 1

[0043] The separation system includes a first separation system and a second separation system arranged in parallel. Both the first and second separation systems are equipped with a ten-way valve 3. The ten-way valves of the first and second separation systems are connected by pipelines. The ten-way valve of one separation system is connected to the sample injection system, and the ten-way valve of the other separation system is connected to the external recovery system 11. Each of the first and second separation systems is connected to a thermal conductivity detector.

[0044] In the above embodiments, both the first separation system and the second separation system further include a metering ring 4 and a pre-separation column 5 connected to the ten-way valve at both ends, as well as a main separation column 6, a first carrier gas branch 7, a second carrier gas branch 8 and an venting branch 9 connected to the ten-way valve at one end; the other end of the main separation column is connected to a thermal conductivity detector.

[0045] The ten-way valve has states A and B. In state A, the injection system is filled with the quantitative loops of the first and second separation systems. When the ten-way valve is switched to state B, the sample gas from the quantitative loop is delivered to the pre-separation column for pre-separation, and the sample is initially separated into a detection part and a non-detection part. When the ten-way valve is switched back to state A, the detection part is delivered to the main separation column, and the non-detection part is emptied.

[0046] When the ten-way valve is in state A, one end of the metering loop is connected to another ten-way valve, and the other end of the metering loop is connected to the injection system or external recovery system; the two ends of the pre-separation column are connected to the first carrier gas branch and the venting branch, respectively; the main separation column is connected to the second carrier gas branch.

[0047] When the ten-way valve is in state B, the two ends of the metering loop are connected to the first carrier gas branch and the pre-separation column, respectively, and the other end of the pre-separation column is connected to the main separation column; the injection system and the external recovery system are directly connected; the second carrier gas branch and the venting branch are connected.

[0048] Example 2

[0049] Based on Example 1, a preferred connection relationship of the ten-way valves in the first and second separation systems is given. Specifically,

[0050] The ten-way valve of the first separation system includes ten connection points, A1~A10; the injection system is connected to A10, the two ends of the quantitative loop 3a are connected to A1 and A8, the two ends of the pre-separation column 4a are connected to A2 and A6, the vent branch 9a is connected to A3, the second carrier gas branch 8a is connected to A4, the main separation column 5a is connected to A5, and the first carrier gas branch 7a is connected to A7;

[0051] The ten-way valve of the second separation system includes ten connection points, B1~B10; the connection point A9 of the ten-way valve of the first separation system is connected to the connection point B10 of the ten-way valve of the second separation system through a pipeline; the two ends of the metering ring 3b are connected to B1 and B8; the two ends of the pre-separation column 4b are connected to B2 and B6; the vent branch 9b is connected to B3; the second carrier gas branch 8b is connected to B4; the main separation column 5b is connected to B5; the first carrier gas branch 7b is connected to B7; and the external recovery system is connected to B9.

[0052] Specifically, when the ten-way valve of the first separation system is in state A, A10 is connected to A1, A2 to A3, A4 to A5, A6 to A7, and A8 to A9. When the ten-way valve is in state B, A1 is connected to A2, A3 to A4, A5 to A6, A7 to A8, and A9 to A10.

[0053] Specifically, when the ten-way valve of the second separation system is in state A, B10 is connected to B1, B2 to B3, B4 to B5, B6 to B7, and B8 to B9. When the ten-way valve is in state B, B1 is connected to B2, B3 to B4, B5 to B6, B7 to B8, and B9 to B10.

[0054] In the above embodiment, a third carrier gas branch 10 is connected to the thermal conductivity detector.

[0055] In Examples 1 and 2, the first carrier gas branch, the second carrier gas branch, and the third carrier gas branch of the first separation system all use high-purity argon as the carrier gas.

[0056] The first, second, and third carrier gas branches of the second separation system all use high-purity helium or high-purity hydrogen as carrier gas.

[0057] In Examples 1 and 2, the pre-separation column of the first separation system is a porous polymer microsphere column; preferably, it is Porapak Q, with a length ranging from 1m to 1.5m. The main separation column of the first separation system is a molecular sieve column 6-1; the molecular sieve column is filled with 13X molecular sieve, with a length of 2m to 3m.

[0058] The pre-separation column of the second separation system uses a porous polymer microsphere column; preferably, it uses Porapak Q, with a length ranging from 1m to 1.5m. The main separation column of the second separation system uses a special column for acidic gases, 6-2; preferably, it uses a mixture of Porapak Q and Porapak N in a 1:1 volume ratio, with a length ranging from 1.5m to 2m.

[0059] In embodiments 1 and 2, in the first separation system and the second separation system, the first carrier gas branch includes a gas source, a pipe connected to the gas source, and a switch valve installed on the pipe. To balance the gas pressure, in the first and second separation systems, the second carrier gas branch includes a gas source, a pipe connected to the gas source, and a switch valve and a damping column installed on the pipe, with the damping column located between the switch valve and the connection point; the second carrier gas branch also includes a gas source, a pipe connected to the gas source, and a switch valve and a damping structure installed on the pipe, with the damping structure located between the switch valve and the connection point, and the damping structure may employ a damping column or capillary damping, etc.

[0060] In Examples 1 and 2, in order to balance the air pressure at the venting branch, the venting branch includes a pipeline and a damping column installed on the pipeline.

[0061] like Figure 1 As shown, the ten-way valve of the first separation system is connected to the intake system, and the ten-way valve of the second separation system is connected to the external recovery system. Alternatively, the positions of the first and second separation systems can be interchanged, with the ten-way valve of the second separation system connected to the intake system and the ten-way valve of the first separation system connected to the external recovery system.

[0062] Taking the example of a 10-way valve of the first separation system connected to the intake system and a 10-way valve of the second separation system connected to the external recovery system, the acid gas analysis includes two parts: one part is the analysis of H2, O2, N2, CH4, and CO, and the other part is the analysis of CO2, H2S, COS, and SO2. The working process and principle of this utility model are as follows:

[0063] Sample introduction process: The analyte gas delivered by the sample introduction system enters the separation system through the A10 port of the 10-way valve of the first separation system; subsequently, it passes sequentially through the quantitative loops connected to the 10-way valves of the first and second separation systems, and finally enters the external recovery system through the B9 port of the 10-way valve of the second separation system. After the sample replacement is completed in both quantitative loops, the states of the 10-way valves of the two separation systems are switched simultaneously.

[0064] The first separation system uses high-purity argon as the carrier gas. Its pre-separation process is as follows: After the first switching of the ten-way valve, the first carrier gas branch and the metering loop are connected in the first separation system, delivering the analyte gas from the metering loop to the pre-separation column. At this time, the other end of the pre-separation column is connected to the main separation column. The pre-separation column separates the analyte gas into two segments. The analyte components in the first segment are H2, the combined peak of O2+N2+CO, and CH4. The gas components in the second segment are CO2, H2S, COS, H2O, SO2, and residual components such as low-carbon hydrocarbons. When the first segment of the analyte passes through the pre-separation column and enters the main separation column, while the second segment of the gas components remains on the pre-separation column, the ten-way valve is switched again.

[0065] The main separation process of the first separation system: After switching the state of the ten-way valve again, the two ends of the pre-separation column are connected to the first carrier gas branch and the vent branch, and the second carrier gas branch is connected to the main separation column. The gas components remaining in the pre-separation column (CO2, H2S, COS, H2O, SO2, and other low-carbon hydrocarbons) are backflushed and vented through the vent branch via the first carrier gas branch. The second carrier gas branch continues to drive the analyte components (H2, O2+N2+CO combined peak, CH4) in the main separation column. After separation by the main separation column, the analyte components are sequentially separated into five elemental components: H2, O2, N2, CH4, and CO, and then sequentially transported to the detector for detection.

[0066] The second separation system uses high-purity helium or hydrogen as the carrier gas. Its pre-separation process is as follows: After the first switching of the ten-way valve, the first carrier gas branch and the metering loop are connected in the second separation system, delivering the analyte gas from the metering loop to the pre-separation column. At this time, the other end of the pre-separation column is connected to the main separation column. The pre-separation column separates the analyte gas into two segments. The analyte components in the first segment are H2, O2+N2+CO combined peaks, CH4, CO2, H2S, COS, H2O, and SO2. The gas components in the second segment are the remaining components such as low-carbon hydrocarbons. When the first segment of the analyte passes through the pre-separation column and enters the main separation column, while the second segment remains on the pre-separation column, the ten-way valve is switched again.

[0067] The main separation process of the second separation system: After switching the state of the ten-way valve again, the two ends of the pre-separation column are connected to the first carrier gas branch and the vent branch, and the second carrier gas branch is connected to the main separation column. The remaining components (low-carbon hydrocarbons and other residual components) in the pre-separation column are backflushed and vented through the vent branch via the first carrier gas branch. The second carrier gas branch continues to drive the preceding components (H2, O2+N2+CO combined peak, CH4, CO2, H2S, COS, H2O, SO2) to flow in the main separation column. After separation by the main separation column (acid gas dedicated column), the preceding components are sequentially delivered to the detector for detection. One important function of the acid gas dedicated column is to separate H2O from H2S and SO2, avoiding interference from H2O in the separation of H2S and SO2, thus improving the accuracy of H2S and SO2 analysis results.

[0068] The components H2, O2, N2, CH4, CO, CO2, H2S, COS, H2O, and SO2 may not all be present in the actual sample, but standard gases stored in high-pressure cylinders can be used to simulate the sample. Since H2S and SO2 react to form sulfur under high pressure, the standard gas must be divided into two cylinders. The first cylinder contains the following composition and volume concentration: H2 24.73%, O2 2.00%, N2 34.94%, CH4 4.99%, CO 1.98%, CO2 0.985%, H2S 0.307%, COS 0.412%, with argon as the balance gas. The second cylinder contains the following composition and volume concentration: SO2 0.367%, with nitrogen as the balance gas.

[0069] To demonstrate the performance of this gas chromatograph in the laboratory, two application examples are provided, with the injection line connected to a cylinder of high-pressure standard gas after depressurization. In Application Example 1, the first cylinder of standard gas is injected, and the corresponding spectrum is as follows. Figure 2 and Figure 3 In application example 2, the second bottle of standard gas was injected, and the corresponding spectrum produced is as follows. Figure 4 Because it is impossible to prepare an accurate concentration of water in high-pressure standard gas, and the water peak in the spectrum is introduced during the pipeline connection process of standard gas production and analysis, it can be qualitative but not accurately quantitative. Application Examples 1 and 2 are for testing the performance of this system.

[0070] The results of the two tests using this gas chromatograph are as follows:

[0071] In Example 1 of the application of the first bottle of standard gas

[0072] The thermal conductivity detector results of the first separation system are as follows: Figure 2 As shown in Table 1:

[0073] Table 1

[0074]

[0075] The thermal conductivity detector results of the second separation system are as follows: Figure 3 As shown in Table 2:

[0076] Table 2

[0077]

[0078] In Example 2, the only effective target substance in the second standard gas application is SO2. The first separation system generates no valid data, and the thermal conductivity detector result of the second system is as follows: Figure 4 As shown in Table 3:

[0079] Table 3

[0080]

[0081] Because acidic gases produced by natural gas purification and desulfurization processes in natural gas chemical and coal chemical industries do not react with H2S and SO2 to form sulfur under atmospheric pressure, acidic gases containing several or all of the following substances—H2, O2, N2, CH4, CO, CO2, H2S, COS, H2O, and SO2—can be directly injected into this gas chromatograph for analysis.

[0082] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Those skilled in the art can readily implement this utility model based on the accompanying drawings and the above description. However, any modifications, alterations, or equivalent variations made by those skilled in the art without departing from the scope of the utility model's technical solution, utilizing the disclosed technical content, are considered equivalent embodiments of this utility model. Furthermore, any equivalent changes, alterations, or variations made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.

Claims

1. An acid gas analyzer gas chromatograph, including an injection system, a separation system, and a thermal conductivity detector; both the injection system and the thermal conductivity detector are connected to the separation system; Its features are: The separation system includes a first separation system and a second separation system connected in parallel. Both the first and second separation systems are equipped with a ten-way valve. The ten-way valves of the first and second separation systems are connected by pipelines. The ten-way valve of one separation system is connected to the sample injection system, and the ten-way valve of the other separation system is connected to the external recovery system. Each of the first and second separation systems is connected to a thermal conductivity detector.

2. The acid gas analyzer gas chromatograph according to claim 1, characterized in that: Both the first and second separation systems also include a metering ring and a pre-separation column connected to the ten-way valve at both ends, as well as a main separation column, a first carrier gas branch, a second carrier gas branch, and an venting branch connected to the ten-way valve at one end; the other end of the main separation column is connected to a thermal conductivity detector. By switching the state of the ten-way valve, one end of the quantitative loop is connected to the quantitative loop on another ten-way valve, and the other end of the quantitative loop is connected to the injection system or external recovery system; both ends of the pre-separation column are connected to the first carrier gas branch and the vent branch, and the second carrier gas branch is connected to the main separation column. Alternatively, the two ends of the metering loop are connected to the first carrier gas branch and the pre-separation column; the two ends of the pre-separation column are connected to the metering loop and the main separation column, and the second carrier gas branch is connected to the venting branch.

3. The acid gas analyzer gas chromatograph according to claim 2, characterized in that: The ten-way valve of the first separation system includes ten connection points, A1~A10; the injection system is connected to A10, the two ends of the quantitative loop are connected to A1 and A8, the two ends of the pre-separation column are connected to A2 and A6, the vent branch is connected to A3, the second carrier gas branch is connected to A4, the main separation column is connected to A5, and the first carrier gas branch is connected to A7. The ten-way valve of the second separation system includes ten connection points, B1~B10; the connection point A9 of the ten-way valve of the first separation system is connected to the connection point B10 of the ten-way valve of the second separation system through a pipeline; the two ends of the metering loop are connected to B1 and B8; the two ends of the pre-separation column are connected to B2 and B6; the vent branch is connected to B3; the second carrier gas branch is connected to B4; the main separation column is connected to B5; the first carrier gas branch is connected to B7; and the external recovery system is connected to B9.

4. The acid gas analyzer gas chromatograph according to claim 2 or 3, characterized in that: A third carrier gas branch is connected to the thermal conductivity detector, which serves as the reference gas path for the thermal conductivity detector.

5. The acid gas analyzer gas chromatograph according to claim 4, characterized in that: The first carrier gas branch, the second carrier gas branch, and the third carrier gas branch of the first separation system all use high-purity argon as the carrier gas; The first, second, and third carrier gas branches of the second separation system all use high-purity helium or high-purity hydrogen as carrier gas.

6. The acid gas analyzer gas chromatograph according to claim 4, characterized in that: The pre-separation column of the first separation system is a polymer porous microsphere column, and the main separation column of the first separation system is a molecular sieve column. The pre-separation column of the second separation system uses a polymer porous microsphere column, and the main separation column of the second separation system uses a special column for acidic gases.

7. The acid gas analyzer gas chromatograph according to claim 4, characterized in that: The carrier gas branch includes a gas source, a pipe connected to the gas source, and a switch valve installed on the pipe; Alternatively, the carrier gas branch includes a gas source, a pipe connected to the gas source, and a switch valve and a damping column installed on the pipe, with the damping column located between the switch valve and the connection point. Alternatively, the carrier gas branch includes a gas source, a pipe connected to the gas source, and a switching valve and a damping structure installed on the pipe, with the damping structure located between the switching valve and the connection point.

8. The acid gas analyzer gas chromatograph according to claim 4, characterized in that: The venting branch includes the pipeline and the damping column installed on the pipeline.

9. The acid gas analyzer gas chromatograph according to claim 5, characterized in that: The ten-way valve of the first separation system is connected to the sample injection system, and the ten-way valve of the second separation system is connected to the external recovery system.

10. The acid gas analyzer gas chromatograph according to claim 5, characterized in that: The ten-way valve of the second separation system is connected to the sample injection system, and the ten-way valve of the first separation system is connected to the external recovery system.

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