Device and method for detecting hydrogen concentration in hydrogen-doped natural gas

Abstract

The invention discloses a detection device and a detection method for hydrogen concentration in hydrogen-doped natural gas, and relates to the technical field of hydrogen-doped natural gas analys.The detection device comprises a ten-way valve, two quantitative pipes, a gas carrying pipe and a sample feeding pipe; the ten-way valve is connected with a first quantitative pipe; the ten-way valve is connected with the first analytical column and the second analytical column, and the second analytical column is connected with the thermal conductivity detector; carrier gas is introduced into the carrier gas pipe, and is used for carrying sample gas to the first analysis column and the second analysis column; the device further comprises a six-way valve, the six-way valve is connected with the second quantitative tube, the six-way valve is connected with the first analytical column, the sample introduction tube is connected with the six-way valve, sample gas enters the two quantitative tubes through the sample introduction tube, the six-way valve and the ten-way valve can achieve switching between a first state and a second state, and the quantitative tubes do not need to be replaced when high-concentration hydrogen and low-concentration hydrogen are detected. According to the detection method, the detection device is used for detection, and high-concentration hydrogen and low-concentration hydrogen can be detected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydrogen-doped natural gas analysis, and particularly relates to a device and method for detecting hydrogen concentration in hydrogen-doped natural gas. BACKGROUND

[0002] Hydrogen-doped natural gas transmission in long-distance pipelines has become one of the effective ways for large-scale and low-cost hydrogen energy transmission. The hydrogen-doped concentration of hydrogen-doped natural gas in existing pipelines and demonstration projects in China has reached as high as 24%. Accurate analysis of hydrogen-doped natural gas with different concentrations can provide support for quality monitoring and accurate metering of hydrogen-doped natural gas, and lay a foundation for the development of hydrogen-doped transmission business in existing pipelines in China.

[0003] In the prior art, a gas chromatograph is usually used to analyze the hydrogen concentration in hydrogen-doped natural gas. However, as the hydrogen-doped concentration in natural gas increases, the accurate and efficient detection technology for different hydrogen concentrations in hydrogen-doped natural gas needs to be broken through. The detection of hydrogen concentration in hydrogen-doped natural gas usually configures a ten-way valve and a quantitative tube, which can only realize a single sampling amount. If the hydrogen concentrations of two samples are very different, the same sampling amount obviously cannot meet the detection of different hydrogen concentrations. If different hydrogen concentrations are to be detected, the size of the quantitative tube needs to be manually changed, which means that the sampling amount required for the detection of high-concentration hydrogen and low-concentration hydrogen is different, and the quantitative tube needs to be replaced, resulting in inconvenient operation and seriously affecting the detection efficiency. SUMMARY

[0004] Based on the problem of different sampling amounts required for the detection of high-concentration hydrogen and low-concentration hydrogen in the background technology, resulting in the need to replace the quantitative ring, which makes the operation inconvenient and the detection efficiency low, the purpose of the present application is to provide a device and method for detecting hydrogen concentration in hydrogen-doped natural gas. The detection device can realize sampling analysis by switching the states of the ten-way valve and the six-way valve, that is, it can quantitatively detect high-concentration hydrogen and low-concentration hydrogen in hydrogen-doped natural gas in different states, and also can realize separate analysis of hydrogen and helium to avoid interference from other components.

[0005] The present application is realized by the following technical solutions:

[0006] In a first aspect, the present application provides a device for detecting hydrogen concentration in hydrogen-doped natural gas, comprising a ten-way valve, two quantitative tubes, a carrier gas pipe and a sampling pipe.

[0007] The ten-way valve is connected to the first quantitative tube.

[0008] The ten-way valve is connected to a first analysis column and a second analysis column, and the second analysis column is connected to a thermal conductivity detector.

[0009] The carrier gas pipe is connected to a carrier gas, which is used to carry sample gas to the first analysis column and the second analysis column.

[0010] Further comprising a six-way valve connected to the second dosing tube, the six-way valve is connected to the first analysis column, the sample tube is connected to the six-way valve, sample gas enters the two dosing tubes through the sample tube, the six-way valve and the ten-way valve can be switched between the first state and the second state, without changing the size of the dosing tube for detecting high concentration hydrogen and low concentration hydrogen.

[0011] Among them, the six-way valve and the ten-way valve can be automatically switched, and the valve event can be set by computer, such as setting the interval event of the automatic switching of the valve.

[0012] The detection device for detecting the hydrogen concentration in the hydrogen-doped natural gas is a device for measuring the hydrogen concentration in the hydrogen-doped natural gas based on gas chromatography. In the analysis part of the detection device, the first dosing tube and the second dosing tube are respectively connected to the six-way valve and the ten-way valve, the carrier gas tube is connected to the ten-way valve, the ten-way valve is connected to the first analysis column and the second analysis column, and the second analysis column is connected to the thermal conductivity detector (TCD). The ten-way valve and the six-way valve can be switched to the first state and the second state. When the ten-way valve and the six-way valve are switched to the first state, the gas in the sample tube can be directly discharged from the detection device after passing through the first dosing tube and the second dosing tube. When the gas in the first dosing tube and the second dosing tube is full and stable, the valve can be switched. When the detected hydrogen concentration is high, the ten-way valve is switched to the second state, the six-way valve remains unchanged in the first state, the carrier gas in the carrier gas tube carries the sample gas in the first dosing tube to flow to the first analysis column and the second analysis column, and then to the thermal conductivity detector for detection. When the detected hydrogen concentration is low, the ten-way valve and the six-way valve are switched to the second state, and the gas in the carrier gas tube flows to the first analysis column and the second analysis column through the first dosing tube and the second dosing tube, and then to the detector for detection. When the hydrogen reaches the second analysis column, the ten-way valve and the six-way valve return to the first state.

[0013] The detection device can realize sample analysis by switching the states of the ten-way valve and the six-way valve, that is, it can quantitatively detect high-concentration hydrogen and low-concentration hydrogen in hydrogen-doped natural gas in different states, and hydrogen and helium are analyzed separately to avoid interference from other components. The detection device does not need to change the size of the dosing tube, and can qualitatively and quantitatively detect hydrogen in hydrogen-doped natural gas of different concentrations by one-time sampling, which is more convenient to operate and has higher detection efficiency.

[0014] In the second aspect, the application provides a method for detecting the hydrogen concentration in hydrogen-doped natural gas, which uses the above detection device for detection.

[0015] The specific detection method is as follows: when the six-way valve and the ten-way valve are switched to the first state, the sample gas in the sample pipe can be directly discharged from the detection device after passing through the two quantitative pipes, when the gas in the two quantitative pipes is full and stable, the ten-way valve is switched to the second state; wherein, when the detected hydrogen concentration is high, the six-way valve does not need to be switched to the second state, and when the detected hydrogen concentration is low, the ten-way valve and the six-way valve are switched to the second state together; when the hydrogen reaches the second analysis column, the ten-way valve and the six-way valve are restored to the first state

[0016] Further, when the detected hydrogen concentration is high, the ten-way valve is switched to the second state, the six-way valve remains in the first state unchanged, and the carrier gas in the carrier gas pipe carries the sample gas in the first quantitative pipe to flow to the first analysis column and the second analysis column, and then to the thermal conductivity detector for detection.

[0017] Further, when the detected hydrogen concentration is low, the ten-way valve and the six-way valve are switched to the second state, and the carrier gas in the carrier gas pipe carries the sample gas in the first quantitative pipe and the second quantitative pipe to flow to the first analysis column and the second analysis column, and then to the thermal conductivity detector for detection.

[0018] Further, during detection, the carrier gas used includes argon.

[0019] Further, during detection, the quantitative pipe used includes a quantitative pipe of 0.25mL-0.5mL.

[0020] Further, during detection, the temperature in the detection condition of the thermal conductivity detector is set to 200℃-250℃.

[0021] Further, during detection, the reference flow of the thermal conductivity detector is set to 35mL / min-40mL / min.

[0022] Further, during detection, the temperature rising program of the chromatography is as follows: 60℃ for 2min, then 20℃ / min to 80℃ for 0min, then 30℃ / min to 190℃ for 0.3333min.

[0023] Further, during detection, a split injection method is used, the split ratio is 30:1, and the split flow is 79.5mL / min-90mL / min.

[0024] The detection method corresponding to the detection device has the advantages of simple operation, convenient process condition control, high detection efficiency, and more accurate detection results.

[0025] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0026] (1) The detection device of the present application can realize sample injection analysis by switching the states of the ten-way valve and the six-way valve, that is, high-concentration hydrogen in hydrogen-doped natural gas and low-concentration hydrogen can be quantitatively detected in different states, and hydrogen and helium can be analyzed separately to avoid the interference of other components;

[0027] (2) When the hydrogen concentration detected by the detection device of the present application is high, the ten-way valve is switched to the second state, the six-way valve remains unchanged in the first state, the carrier gas in the carrier gas pipe carries the sample gas in the first quantitative tube to flow to the first analysis column and the second analysis column, and then to the detector for detection; when the hydrogen concentration of the detector is low, the ten-way valve and the six-way valve are both switched to the second state, the carrier gas in the carrier gas pipe carries the sample gas in the first quantitative tube and the second quantitative tube to flow to the first analysis column and the second analysis column, and then to the thermal conductivity detector for detection; when the hydrogen reaches the second analysis column, the ten-way valve and the six-way valve both return to the first state. The detection method is simple and easy to operate, and the detection result is also very accurate;

[0028] (3) Using the detection device of the present application for detection, there is no need to replace the size of the quantitative ring, and by one-time sample injection, hydrogen and helium in hydrogen-doped natural gas with different concentrations can be qualitatively and quantitatively detected. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the example embodiments of the present application, the following will briefly introduce the drawings needed to be used in the examples. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor. In the drawings:

[0030] Figure 1 It is a structure schematic diagram of the detection device for hydrogen concentration in hydrogen-doped natural gas in the present application (the state of the measured gas entering the quantitative tube);

[0031] Figure 2 It is a structure schematic diagram of the detection device for hydrogen concentration in hydrogen-doped natural gas in the present application for measuring the hydrogen concentration in high-content hydrogen-doped natural gas (detection state);

[0032] Figure 3 It is a structure schematic diagram of the detection device for hydrogen concentration in hydrogen-doped natural gas in the present application for measuring the hydrogen concentration in low-content hydrogen-doped natural gas (detection state);

[0033] Figure 4 It is a detection result diagram in Example 1 of the present application;

[0034] Figure 5 It is a detection result diagram in Example 2 of the present application.

[0035] Reference signs:

[0036] 01 - sample tube, 02 - six-way valve, 03 - ten-way valve, 04 - first constant volume tube, 05 - second constant volume tube, 06 - first analytical column, 07 - second analytical column, 08 - thermal conductivity detector, 09 - carrier gas tube. DETAILED DESCRIPTION

[0037] In order to make the objects, technical solutions, and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application.

[0038] The embodiments of the device for detecting hydrogen concentration in hydrogen-doped natural gas and the method for detecting hydrogen concentration in hydrogen-doped natural gas specifically disclosed in the present application are described in detail below with appropriate reference to the accompanying drawings. However, there will be cases where unnecessary detailed description is omitted. For example, there will be cases where detailed description of matters known well and repeated description of substantially the same structure are omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate understanding by those skilled in the art. In addition, the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present application, and are not intended to limit the subject matter recited in the claims.

[0039] The "range" disclosed in the present application is defined in the form of a lower limit and an upper limit, and a given range is defined by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundaries of a particular range. The range defined in this way can include or not include the end value, and can be arbitrarily combined, that is, any lower limit can be combined with any upper limit to form a range.

[0040] In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be understood to indicate or imply relative importance or to imply the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features.

[0041] If not specifically stated, all embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions.

[0042] If not specifically stated, all technical features and optional technical features of the present application can be combined with each other to form new technical solutions.

[0043] If not specifically stated, "including" and "comprising" mentioned in the present application means open-ended and can also be closed. For example, "including" and "comprising" can mean that other substances not listed can also be included or contained, or only the listed substances can be included or contained.

[0044] Embodiment 1

[0045] The embodiment provides a detection device for hydrogen concentration in hydrogen-doped natural gas, which comprises a ten-way valve 03, two constant-volume tubes, a carrier gas tube 09 and a sample inlet tube 01.

[0046] The ten-way valve 03 is connected with the first constant-volume tube 04.

[0047] The ten-way valve 03 is connected with the first analysis column 06 and the second analysis column 07, and the second analysis column 07 is connected with the thermal conductivity detector 08.

[0048] The carrier gas tube 09 is connected with carrier gas, which is used to carry sample gas to the first analysis column 06 and the second analysis column 07.

[0049] The detection device further comprises a six-way valve 02, the six-way valve 02 is connected with the second constant-volume tube 05, the six-way valve 02 is connected with the first analysis column 06, the sample inlet tube 01 is connected with the six-way valve 02, sample gas enters the two constant-volume tubes through the sample inlet tube 01, and the six-way valve 02 and the ten-way valve 03 can be switched to the first state and the second state, so that the constant-volume tubes do not need to be replaced in detection of high-concentration hydrogen and low-concentration hydrogen.

[0050] The detection device for hydrogen concentration in hydrogen-doped natural gas is a measurement device for measuring hydrogen concentration in hydrogen-doped natural gas based on gas chromatography. In the analysis part of the detection device, the first constant-volume tube 04 and the second constant-volume tube 05 are connected with the six-way valve 02 and the ten-way valve 03 respectively, the carrier gas tube is connected with the ten-way valve 03, the ten-way valve 03 is connected with the first analysis column 06 and the second analysis column 07, and the second analysis column 07 is connected with the thermal conductivity detector 08. The ten-way valve 03 and the six-way valve 02 can be switched to the first state and the second state. When the ten-way valve 03 and the six-way valve 02 are switched to the first state, sample gas in the sample inlet tube 01 can be directly discharged from the detection device after passing through the first constant-volume tube 04 and the second constant-volume tube 05. When the gas in the first constant-volume tube 04 and the second constant-volume tube 05 is full and stable, the valves can be switched.

[0051] The specific method for detecting hydrogen concentration in hydrogen-doped natural gas by using the detection device is as follows.

[0052] When the six-way valve 02 and the ten-way valve 03 are switched to the first state, sample gas in the sample inlet tube 01 can be directly discharged from the detection device after passing through the two constant-volume tubes. When the gas in the two constant-volume tubes is full and stable, the ten-way valve 03 is switched to the second state. When the detected hydrogen concentration is relatively high, the six-way valve 02 does not need to be switched to the second state. When the detected hydrogen concentration is relatively low, the ten-way valve 03 and the six-way valve 02 are switched to the second state together. When hydrogen reaches the second analysis column 07, the ten-way valve 03 and the six-way valve 02 are restored to the first state.

[0053] Specifically, when the detected hydrogen concentration is high, the ten-way valve 03 is switched to the second state, the six-way valve 02 remains unchanged in the first state, and the carrier gas in the carrier gas pipe 09 carries the sample gas in the first dosing pipe 04 to flow to the first analysis column 06 and the second analysis column 07, and then to the thermal conductivity detector 08 for detection.

[0054] Specifically, when the detected hydrogen concentration is low, the ten-way valve 03 and the six-way valve 02 are both switched to the second state, and the carrier gas in the carrier gas pipe 09 carries the sample gas in the first dosing pipe 04 and the second dosing pipe 05 to flow to the first analysis column 06 and the second analysis column 07, and then to the thermal conductivity detector 08 for detection.

[0055] The detection device connects the first dosing pipe 04 and the second dosing pipe 05 in series through the ten-way valve 03 and the six-way valve 02, and by switching the state of the valve, the size of the dosing ring does not need to be changed, and different concentrations of hydrogen-doped natural gas can be detected qualitatively and quantitatively by one-time sampling. At the same time, the present application can analyze hydrogen and helium separately, avoiding interference from other components.

[0056] The detection process of the actual detection of the sample by using the above detection device and detection method is as follows:

[0057] (1) Process of sample gas entering the dosing pipe:

[0058] Reference Figure 1 As shown, open the sample inlet pipe 01 valve, and the sample gas enters the second dosing pipe 05 and the first dosing pipe 04 in turn through the six-way valve 02 and the ten-way valve 03. When the amount of sample in the first dosing pipe 04 and the second dosing pipe 05 reaches the set amount, close the sample inlet pipe 01 valve, and wait for the analysis and detection of the measured gas.

[0059] (2) Detection process:

[0060] 1) Reference Figure 2 As shown, measure the hydrogen concentration in high-content hydrogen-doped natural gas.

[0061] Control the ten-way valve 03 to adjust it to the second state, so that one end of the first dosing pipe 04 is in communication with the carrier gas inlet end, and the other end of the first dosing pipe 04 is in communication with the first analysis column 06. Specifically, let the carrier gas carry the sample gas in the first dosing pipe 04 into the first analysis column 06 and the second analysis column 07, and finally into the thermal conductivity detector 08 (TCD) for analysis of the hydrogen concentration and helium content in high-content hydrogen-doped natural gas.

[0062] 2) Reference Figure 3 As shown, measure the hydrogen concentration in low-content hydrogen-doped natural gas.

[0063] Control the 10-way valve 03 and 6-way valve 02 to adjust them to the second state, connecting one end of the first quantitative tube 04 to the carrier gas inlet, and the other end of the first quantitative tube 04 to the second quantitative tube 05. The other end of the second quantitative tube 05 is then connected to the first analytical column 06. Specifically, the carrier gas carries the sample gas from the first and second quantitative tubes 04 and 05 into the first and second analytical columns 06 and 07, respectively, and finally into the thermal conductivity detector 08 to analyze the hydrogen and helium concentrations in the low-content hydrogen-doped natural gas.

[0064] The above-described detection device and method were used to detect the No. 1 actual sample (hydrogen content 20.3%, helium content 5.1%, the remainder being methane). This embodiment only considers the detection of hydrogen and helium. The test and analysis conditions are shown in Table 1 below.

[0065] Table 1

[0066]

[0067] The analysis results are shown in Table 2 below. Figure 4 As shown.

[0068] Table 2

[0069]

[0070] For a hydrogen-blended natural gas sample with a hydrogen content of 20.3%, the following method was used: Figure 1 As shown, when the gas in both quantitative tubes is full and stable, the ten-way valve switches to its second state, while the six-way valve remains in its first state. The carrier gas in the carrier tube carries the sample gas from quantitative tube 1 to analytical columns 06 and 07, and then flows to the thermal conductivity detector for detection. When hydrogen reaches analytical column 07, both the ten-way and six-way valves return to their first states. The sample was injected 11 times, and the average value was used as the final detection result. The relative standard deviation of the content and peak area was 0.28%, indicating that the sample detection results are accurate and reliable.

[0071] Example 2

[0072] The above-described detection device and method were used to detect sample No. 2 (hydrogen content 3.01%, helium content 1.02%, remainder methane). This embodiment only considers the detection of hydrogen and helium. The test and analysis conditions are shown in Table 3 below. The analysis results are shown in Table 4 below. Figure 5 As shown.

[0073] Table 3

[0074]

[0075] Table 4

[0076]

[0077]

[0078] For a hydrogen-blended natural gas sample with a hydrogen content of 3.01%, the following method was used: Figure 1 As shown, when the gas in quantitative tube 04 and quantitative tube 05 is full and stable, both the ten-way valve 03 and the six-way valve 02 switch to the second state. The carrier gas in the carrier gas tube 09 carries the sample gas from quantitative tubes 04 and 05 to analytical columns 06 and 07, and then flows to the thermal conductivity detector for detection. When hydrogen reaches analytical column 07, both the ten-way valve 03 and the six-way valve 04 return to the first state. The sample was injected 11 times, and the average value was used as the final detection result. The relative standard deviation of the content and peak area was 0.41%, indicating that the sample detection results are accurate and reliable.

[0079] Examples 1 and 2 above tested high-content hydrogen and low-content hydrogen, respectively. During the testing of the two samples, it was not necessary to change the size of the quantitative loop. The valve cutting time only needed to be preset on the computer to continuously and accurately test the two samples.

[0080] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for detecting hydrogen concentration in hydrogen-doped natural gas, comprising a ten-way valve (03), two constant-volume tubes, a carrier gas tube (09) and a sample inlet tube (01); the ten-way valve (03) is connected to a first constant-volume tube (04); the ten-way valve (03) is connected to a first analysis column (06) and a second analysis column (07), and the second analysis column (07) is connected to a thermal conductivity detector (08); the carrier gas tube (09) is connected to carrier gas, which is used to carry sample gas to the first analysis column (06) and the second analysis column (07); characterized in that a six-way valve (02) is further included, the six-way valve (02) is connected to a second constant-volume tube (05), the six-way valve (02) is connected to the first analysis column (06), the sample inlet tube (01) is connected to the six-way valve (02), sample gas enters the two constant-volume tubes through the sample inlet tube (01), and the six-way valve (02) and the ten-way valve (03) can be switched between a first state and a second state, so that the constant-volume tubes do not need to be replaced in detecting high-concentration hydrogen and low-concentration hydrogen.

2. A method for detecting the concentration of hydrogen in hydrogen-doped natural gas, characterized by, The device of claim 1 is used for detection. The specific detection method is as follows: when the six-way valve (02) and the ten-way valve (03) are both switched to the first state, sample gas in the sample inlet tube (01) can be directly discharged from the device after passing through the two constant-volume tubes, when the sample gas in the two constant-volume tubes is full and stable, the ten-way valve (03) is switched to the second state; when the detected hydrogen concentration is relatively high, the six-way valve (02) does not need to be switched to the second state, when the detected hydrogen concentration is relatively low, the ten-way valve (03) and the six-way valve (02) are both switched to the second state; when hydrogen reaches the second analysis column (07), the ten-way valve (03) and the six-way valve (02) are both restored to the first state.

3. The method of claim 2, wherein the hydrogen concentration in the hydrogen-doped natural gas is detected by using a method selected from the group consisting of a gas chromatography method, a mass spectrometry method, a thermal conductivity detector method, a flame ionization detector method, a hydrogen sensor method, and a hydrogen sensor array method. When the detected hydrogen concentration is relatively high, the ten-way valve (03) is switched to the second state, the six-way valve (02) remains unchanged in the first state, carrier gas in the carrier gas tube (09) carries sample gas in the first constant-volume tube (04) to flow to the first analysis column (06) and the second analysis column (07), and then to the thermal conductivity detector (08) for detection.

4. The method of claim 2, wherein the hydrogen concentration in the hydrogen-doped natural gas is detected by using a method selected from the group consisting of a gas chromatography method, a mass spectrometry method, a thermal conductivity detector method, a flame ionization detector method, a hydrogen sensor method, and a hydrogen sensor array method. When the detected hydrogen concentration is relatively low, the ten-way valve (03) and the six-way valve (02) are both switched to the second state, carrier gas in the carrier gas tube (09) carries sample gas in the first constant-volume tube (04) and the second constant-volume tube (05) to flow to the first analysis column (06) and the second analysis column (06), and then to the thermal conductivity detector (08) for detection.

5. The method of claim 2, wherein the hydrogen concentration in the hydrogen-doped natural gas is detected by using a method selected from the group consisting of a gas chromatography method, a mass spectrometry method, a thermal conductivity detector method, a flame ionization detector method, a hydrogen sensor method, and a hydrogen selective electrode method. During detection, the carrier gas used includes argon.

6. The method of claim 2, wherein the hydrogen concentration in the hydrogen-doped natural gas is detected by using a method selected from the group consisting of a gas chromatography method, a mass spectrometry method, a thermal conductivity detector method, a flame ionization detector method, a hydrogen sensor method, and a hydrogen sensor array method. During detection, the constant-volume tube used includes a constant-volume tube with a volume of 0.25 mL-0.5 mL.

7. The method of claim 2, wherein the hydrogen concentration in the hydrogen-doped natural gas is detected by using a method selected from the group consisting of a gas chromatography method, a mass spectrometry method, a thermal conductivity detector method, a flame ionization detector method, a hydrogen sensor method, and a hydrogen selective electrode method. During detection, the temperature in the detection condition of the thermal conductivity detector (08) is set to 200℃-250℃.

8. The method of claim 2, wherein the hydrogen concentration in the hydrogen-doped natural gas is detected by using a method selected from the group consisting of a gas chromatography method, a mass spectrometry method, a thermal conductivity detector method, a flame ionization detector method, a hydrogen sensor method, and a hydrogen selective electrode method. During detection, the reference flow of the thermal conductivity detector (08) is set to 35 mL / min-40 mL / min, and the tail-blowing flow is set to 2 mL / min.

9. The method of claim 2, wherein the hydrogen concentration in the hydrogen-doped natural gas is detected by using a method selected from the group consisting of a gas chromatography method, a mass spectrometry method, a thermal conductivity detector method, a flame ionization detector method, a hydrogen sensor method, and a hydrogen selective electrode method. During detection, the temperature rising program of the chromatogram is as follows: 60℃ for 2 min, then 20℃ / min to 80℃ for 0 min, then 30℃ / min to 190℃ for 0.3333 min.

10. The method of claim 2, wherein the hydrogen concentration in the hydrogen-doped natural gas is detected by using a method selected from the group consisting of a gas chromatography method, a mass spectrometry method, a thermal conductivity detector method, a flame ionization detector method, a hydrogen sensor method, and a hydrogen selective electrode method. During detection, the split ratio was 30:1, and the split flow was 79.5 mL / min-90 mL / min.

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