Hydrogen-containing natural gas volume flowmeter performance calibration system, device, apparatus, and method

Abstract

The application discloses a hydrogen-containing natural gas volume flowmeter performance calibration system, device, equipment and method, and relates to the technical field of natural gas measurement. The hydrogen-containing natural gas volume flowmeter performance calibration system comprises a hydrogen pipeline, a natural gas pipeline and a hydrogen-containing gas pipeline, the outlet end of the hydrogen pipeline and the natural gas pipeline is connected with the inlet end of the hydrogen-containing gas pipeline; a first standard mass flow measuring unit for detecting the mass flow of hydrogen is arranged on the hydrogen pipeline; a second standard mass flow measuring unit for detecting the mass flow of natural gas is arranged on the natural gas pipeline; a to-be-calibrated volume flowmeter for detecting the mass flow of hydrogen-containing natural gas is arranged on the hydrogen-containing gas pipeline; and a density measuring unit, a first pressure measuring unit and a first temperature measuring unit for detecting the gas density, pressure and temperature of the hydrogen-containing natural gas, respectively, are arranged on the hydrogen-containing gas pipeline. The application solves the problem of measurement deviation of the existing flowmeter when measuring hydrogen-containing natural gas.

Description

Technical Field

[0001] This invention relates to the field of natural gas flow detection technology, specifically to a performance calibration system, apparatus, equipment, and method for hydrogen-containing natural gas volumetric flow meters. Background Technology

[0002] Hydrogen-blended natural gas for transportation refers to the technology of adding a certain concentration of hydrogen to existing natural gas pipeline systems to form a hydrogen-natural gas mixture for transport. Natural gas blending with hydrogen has been recognized by the International Energy Agency as a hydrogen energy storage and transportation method with great development potential, and is considered an important means to achieve energy conservation, emission reduction, and large-scale hydrogen transportation.

[0003] Currently, there is a lack of effective methods and technologies for measuring hydrogen-containing natural gas. In actual production processes, the measurement methods and standards for conventional natural gas are directly applied. However, directly applying the measurement standards for conventional natural gas will lead to measurement errors.

[0004] Therefore, how to accurately calibrate the flow meter used for metering hydrogen-blended natural gas has become an urgent technical problem to be solved. Summary of the Invention

[0005] The purpose of this invention is to provide a performance calibration system for a hydrogen-containing natural gas volumetric flow meter. This system can obtain relevant data for calculating the error of the flow meter used for metering hydrogen-blended natural gas. Based on the relevant data, the actual volumetric flow rate of the hydrogen-blended natural gas can be calculated to obtain the error of the flow meter used for metering hydrogen-blended natural gas.

[0006] In addition, the present invention also provides a performance calibration device and method for hydrogen-containing natural gas volumetric flow meter. The error of the flow meter used for measuring hydrogen-blended natural gas is calculated by acquiring relevant data, and the flow meter used for measuring hydrogen-blended natural gas is adjusted based on the error, so as to solve the problem of measurement deviation in existing flow meters when measuring hydrogen-containing natural gas.

[0007] In addition, the present invention also provides an apparatus for performing a performance calibration method for a hydrogen-containing natural gas volumetric flow meter.

[0008] This invention is achieved through the following technical solution:

[0009] A performance calibration system for a hydrogen-containing natural gas volumetric flow meter includes a hydrogen pipeline, a natural gas pipeline, and a hydrogen-containing gas transmission pipeline, wherein the outlet ends of the hydrogen pipeline and the natural gas pipeline are connected to the inlet end of the hydrogen-containing gas transmission pipeline.

[0010] The hydrogen pipeline is equipped with a first standard mass flow measurement unit for detecting the mass flow rate of hydrogen.

[0011] The natural gas pipeline is equipped with a second standard mass flow measurement unit for detecting the mass flow rate of natural gas.

[0012] The hydrogen-containing gas pipeline is equipped with a volumetric flow meter to be calibrated for detecting the mass flow rate of hydrogen-containing natural gas. The hydrogen-containing gas pipeline is also equipped with a density measuring unit, a first pressure measuring unit, and a first temperature measuring unit for detecting the gas density, pressure, and temperature of hydrogen-containing natural gas, respectively.

[0013] The present invention can calculate the hydrogen blending ratio of hydrogen-containing natural gas (hydrogen-blended natural gas) by using the first standard mass flow measurement unit and the second standard mass flow measurement unit.

[0014] This invention calculates the compressibility factor of the volumetric flow meter to be calibrated by obtaining the gas density, pressure, and temperature of hydrogen-containing natural gas. Then, the actual flow rate of the hydrogen-blended natural gas (i.e., the calculated value of the volumetric flow rate after calibration of the volumetric flow meter) can be calculated using the compressibility factor. The difference between the measured value and the calculated value of the volumetric flow meter is the error of the volumetric flow meter in measuring hydrogen-containing natural gas. Based on this error, the volumetric flow meter can be calibrated, thus solving the problem of measurement deviation in existing flow meters when measuring hydrogen-containing natural gas.

[0015] Furthermore, the inlet end of the hydrogen-containing gas transmission pipeline is provided with a gas mixing zone for buffering gas fluctuations. The gas mixing zone can be a pipe with a diameter larger than that of the hydrogen-containing gas transmission pipeline, or it can be of other shapes.

[0016] Furthermore, the inlet ends of the hydrogen pipeline and the natural gas pipeline are respectively equipped with a first valve and a second valve, and also include a control unit electrically connected to the first valve and the second valve;

[0017] The control unit is used to adjust the flow rate of the first valve and the second valve.

[0018] Furthermore, sampling and analysis units are installed on hydrogen-containing gas pipelines;

[0019] The sampling and analysis unit is used to obtain the hydrogen blending ratio of hydrogen-containing natural gas and to feed back the hydrogen blending ratio of the hydrogen-containing gas transmission pipeline to the control unit.

[0020] The control unit adjusts the flow rate of the first valve and the second valve according to the received hydrogen doping ratio to achieve the set hydrogen doping ratio.

[0021] Furthermore, the sampling and analysis unit is located at the inlet end of the hydrogen-containing gas pipeline.

[0022] Furthermore, the hydrogen pipeline is equipped with a second pressure measuring unit and a second temperature measuring unit for detecting hydrogen pressure and temperature, respectively.

[0023] Furthermore, the natural gas pipeline is equipped with a third pressure measuring unit and a third temperature measuring unit for detecting natural gas pressure and temperature, respectively.

[0024] A performance calibration device for hydrogen-containing natural gas volumetric flow meters, comprising:

[0025] The data acquisition unit is used to collect the hydrogen mass flow rate, natural gas mass flow rate, gas density of hydrogen-containing natural gas, pressure of hydrogen-containing natural gas, and temperature of hydrogen-containing natural gas detected by the first standard mass flow rate measurement unit, the second standard mass flow rate measurement unit, the density measurement unit, the first pressure measurement unit, and the first temperature measurement unit.

[0026] The hydrogen blending ratio calculation module calculates the hydrogen blending ratio based on the mass flow rate of hydrogen and natural gas collected by the data acquisition unit.

[0027] The compressibility factor calculation module calculates the compressibility factor for the corresponding hydrogen blending ratio based on the gas density, pressure, and temperature of the hydrogen-containing natural gas collected by the data acquisition unit.

[0028] The volumetric flow rate calculation module calculates the actual volumetric flow rate of hydrogen-containing natural gas based on the compressibility factor and the volumetric flow rate algorithm; this is the volumetric flow rate count value after calibration of the volumetric flow rate meter to be calibrated.

[0029] Furthermore, it also includes: an error calculation module, which calculates the measurement error based on the actual volumetric flow rate calculated by the volumetric flow rate calculation module and the measured volumetric flow rate measured by the volumetric flow meter to be calibrated.

[0030] A method for calibrating the performance of a hydrogen-containing natural gas volumetric flow meter, the method being based on the aforementioned hydrogen-containing natural gas volumetric flow meter performance calibration device, includes the following steps:

[0031] S1. Obtain the hydrogen mass flow rate, natural gas mass flow rate, gas density of hydrogen-containing natural gas, pressure of hydrogen-containing natural gas, and temperature of hydrogen-containing natural gas;

[0032] S2. Calculate the hydrogen blending ratio based on the mass flow rate of hydrogen and natural gas obtained in step S1, using the mass ratio.

[0033] S3. Based on the gas density, pressure, and temperature of the hydrogen-containing natural gas obtained in step S1, calculate the compressibility factor for the corresponding hydrogen blending ratio using the compressibility factor algorithm.

[0034] S4. Based on the compression factor obtained in step S3, calculate the actual volumetric flow rate of hydrogen-containing natural gas using a volumetric flow rate algorithm.

[0035] Furthermore, before proceeding to step S4, the following steps are also included:

[0036] Obtain the compressibility factor for multiple different hydrogen doping ratios;

[0037] By fitting multiple compression factors, compression factor curves are obtained;

[0038] Based on the compression factor curve, the compression factor data at the predetermined hydrogen doping ratio is obtained.

[0039] Performance calibration equipment for hydrogen-containing natural gas volumetric flow meters, including:

[0040] At least one processor, and at least one memory communicatively connected to the processor;

[0041] The memory stores program instructions that can be executed by the processor, and the processor calls the program instructions to execute the above calibration method.

[0042] A computer-readable storage medium storing computer instructions that cause a computer to perform the above-described calibration method.

[0043] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0044] 1. This invention can calculate the compressibility factor of the volumetric flow meter to be calibrated based on the measured data, and then calibrate the volumetric flow meter to be calibrated using the compressibility factor. This can solve the problem that the compressibility factor of hydrogen-blended natural gas is not accurately calculated according to the standard method, thereby accurately completing the calibration of the volumetric flow rate of the volumetric flow meter to be calibrated under different hydrogen blending ratios.

[0045] 2. This invention can measure the compressibility factor of the volumetric flow meter to be calibrated under different hydrogen doping ratios and different pressures, fit multiple compressibility factors to obtain a compressibility factor curve, and obtain the compressibility factor for all hydrogen doping ratios by searching the compressibility factor curve.

[0046] 3. The hydrogen-containing natural gas volumetric flow meter performance calibration system of the present invention has a simple structure and the calibration method is easy to implement.

[0047] 4. This invention is the first to propose a calibration method for the flow meter used in the metering of hydrogen-blended natural gas, providing a new approach to the metering of hydrogen-blended natural gas. Attached Figure Description

[0048] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0049] Figure 1 This is a schematic diagram of the performance calibration system for hydrogen-containing natural gas volumetric flow meter of the present invention;

[0050] Figure 2 This is a schematic diagram of the performance calibration device for the hydrogen-containing natural gas volumetric flow meter of the present invention.

[0051] Figure 3 This is a schematic flowchart of the hydrogen-containing natural gas flow meter performance calibration method of the present invention.

[0052] The attached diagram shows the markings and corresponding component names:

[0053] 1-First valve, 2-Second pressure measurement unit, 3-First standard mass flow measurement unit, 4-Second temperature measurement unit, 5-Sampling and analysis unit, 6-Gas mixing zone, 7-Density measurement unit, 8-First pressure measurement unit, 9-Volume flow meter to be calibrated, 10-First temperature measurement unit, 11-Second valve, 12-Second standard mass flow measurement unit, 13-Third pressure measurement unit, 14-Third temperature measurement unit, 15-Control unit. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0055] It should be understood that the terms "system," "device," "unit," and / or "module" as used in this specification are a method of distinguishing different components, elements, parts, sections, or assemblies at different levels. However, if other terms can achieve the same purpose, they may be replaced by other expressions.

[0056] Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, and these steps and elements do not constitute an exclusive list; a method or apparatus may also include other steps or elements. Flowcharts are used in this specification to illustrate the operations performed by a system according to embodiments of this specification. It should be understood that preceding or subsequent operations are not necessarily performed in exact order. Instead, the steps can be processed in reverse order or simultaneously. Furthermore, other operations can be added to these processes, or one or more steps can be removed from these processes.

[0057] Example 1:

[0058] like Figure 1 As shown, the performance calibration system for a hydrogen-containing natural gas volumetric flow meter includes a hydrogen pipeline, a natural gas pipeline, and a hydrogen-containing gas transmission pipeline. The outlet ends of the hydrogen pipeline and the natural gas pipeline are connected to the inlet end of the hydrogen-containing gas transmission pipeline. The hydrogen pipeline, the natural gas pipeline, and the hydrogen-containing gas transmission pipeline constitute a pipeline assembly, which is used to simulate the transportation environment of hydrogen-containing natural gas.

[0059] The hydrogen pipeline is used to import hydrogen, and the natural gas pipeline is used to import natural gas.

[0060] The hydrogen pipeline is equipped with a first standard mass flow rate measuring unit 3 for detecting the mass flow rate of hydrogen; the natural gas pipeline is equipped with a second standard mass flow rate measuring unit 12 for detecting the mass flow rate of natural gas.

[0061] Specifically, the first standard mass flow measurement unit 3 and the second standard mass flow measurement unit 12 are standard mass flow meters.

[0062] The hydrogen-containing gas pipeline is equipped with a volumetric flow meter 9 to be calibrated for detecting the mass flow rate of hydrogen-containing natural gas. The hydrogen-containing gas pipeline is also equipped with a density measuring unit 7, a first pressure measuring unit 8, and a first temperature measuring unit 10 for detecting the gas density, pressure, and temperature of hydrogen-containing natural gas, respectively.

[0063] Specifically, density measuring unit 7 is a gas density tester; first pressure measuring unit 8 is a gas pressure gauge; and first temperature measuring unit 10 is a thermometer.

[0064] In this embodiment, the hydrogen mass flow rate and natural gas mass flow rate collected by the first standard mass flow rate measurement unit 3 and the second standard mass flow rate measurement unit 12 can be used to calculate the hydrogen blending ratio of hydrogen-containing natural gas; the gas density, pressure and temperature of hydrogen-containing natural gas obtained by the density measurement unit 7, the first pressure measurement unit 8 and the first temperature measurement unit 10 can be used to calculate the compressibility factor of the volumetric flow meter to be calibrated, and then the actual flow rate of the hydrogen-blended natural gas can be calculated using the compressibility factor. The difference between the measured value and the calculated value of the volumetric flow meter to be calibrated is the error of the volumetric flow meter to be calibrated when measuring hydrogen-containing natural gas.

[0065] In this embodiment, in order to obtain hydrogen-containing natural gas with different hydrogen blending ratios, a control system is also included. The control system includes a first valve 1, a second valve 11, and a control unit 15. The first valve 1 is installed at the inlet end of the hydrogen pipeline, and the second valve 11 is installed at the inlet end of the natural gas pipeline. The control unit 15 is electrically connected to the first valve 1 and the second valve 11 and is used to control the flow rate of the first valve 1 and the second valve 11.

[0066] The control unit 15 adjusts the hydrogen content in natural gas by controlling the flow rates of the first valve 1 and the second valve 11.

[0067] Preferably, the hydrogen-containing gas pipeline is also equipped with a sampling and analysis unit 5, which is used to obtain the hydrogen blending ratio of the hydrogen-containing natural gas and to feed back the hydrogen blending ratio of the hydrogen-containing gas pipeline to the control unit 15.

[0068] If the hydrogen doping ratio data obtained by the sampling and analysis unit 5 does not meet the set hydrogen doping ratio, the control unit 15 controls the flow rate of the first valve and the second valve 11 to achieve the set hydrogen doping ratio.

[0069] The sampling and analysis unit 5 can be used for online or offline detection. When online detection is used, the sampling and analysis unit 5 includes a branch pipe connected to the hydrogen-containing gas pipeline, which is connected to an online detection device that can detect the hydrogen blending ratio. When offline detection is used, and a valve is installed on the branch pipe, the sampling and analysis unit 5 includes a sampling port and a detection device that can detect the hydrogen blending ratio. The control unit 15 can be a PLC or an industrial computer.

[0070] Preferably, the sampling and analysis unit 5 is located at the inlet end of the hydrogen-containing gas pipeline.

[0071] In this embodiment, in order to improve the accuracy of the data collected by the density measurement unit 7, the first pressure measurement unit 8 and the first temperature measurement unit 10, a gas mixing zone 6 is also provided at the inlet of the hydrogen-containing gas pipeline. The gas mixing zone 6 is used to buffer gas fluctuations. The gas mixing zone 6 is a circular pipe with a diameter larger than that of the hydrogen-containing gas pipeline. That is, the gas mixing zone 6 is located at the front end of the density measurement unit 7, the first pressure measurement unit 8 and the first temperature measurement unit 10.

[0072] Preferably, in this embodiment, the hydrogen pipeline is provided with a second pressure measuring unit 2 and a second temperature measuring unit 4 for detecting hydrogen pressure and temperature, respectively; the natural gas pipeline is provided with a third pressure measuring unit 13 and a third temperature measuring unit 14 for detecting natural gas pressure and temperature, respectively.

[0073] Among them, the pressure measurement unit and temperature measurement unit on the hydrogen pipeline and natural gas pipeline serve as safety monitoring equipment to monitor the safety values ​​of the hydrogen pipeline and natural gas pipeline.

[0074] Example 2:

[0075] like Figure 2 As shown, the performance calibration device for hydrogen-containing natural gas volumetric flow meter includes:

[0076] The data acquisition unit is used to collect the hydrogen mass flow rate, natural gas mass flow rate, gas density of hydrogen-containing natural gas, pressure of hydrogen-containing natural gas, and temperature of hydrogen-containing natural gas detected by the first standard mass flow rate measurement unit 3, the second standard mass flow rate measurement unit 12, the density measurement unit 7, the first pressure measurement unit 8, and the first temperature measurement unit 10.

[0077] The hydrogen blending ratio calculation module calculates the hydrogen blending ratio based on the mass flow rate of hydrogen and natural gas collected by the data acquisition unit.

[0078] The compressibility factor calculation module calculates the compressibility factor for the corresponding hydrogen blending ratio based on the gas density, pressure, and temperature of the hydrogen-containing natural gas collected by the data acquisition unit.

[0079] The volumetric flow rate calculation module calculates the actual volumetric flow rate of hydrogen-containing natural gas based on the compressibility factor and the volumetric flow rate algorithm.

[0080] Preferably, it also includes: an error calculation module, which calculates the measurement error based on the actual volumetric flow rate calculated by the volumetric flow rate calculation module and the measured volumetric flow rate measured by the volumetric flow rate meter 9 to be calibrated.

[0081] Example 3:

[0082] like Figure 3 As shown, a method for calibrating the performance of a hydrogen-containing natural gas volumetric flow meter, based on the hydrogen-containing natural gas volumetric flow meter performance calibration device described in Example 2, includes the following steps:

[0083] S1. Obtain the hydrogen mass flow rate, natural gas mass flow rate, gas density of hydrogen-containing natural gas, pressure of hydrogen-containing natural gas, and temperature of hydrogen-containing natural gas;

[0084] S2. Calculate the hydrogen blending ratio based on the mass flow rate of hydrogen and natural gas obtained in step S1, using the mass ratio.

[0085] The specific formula for the hydrogen doping ratio is:

[0086]

[0087] Where X represents the hydrogen doping ratio, q m1 q represents the hydrogen mass flow rate data. m2 Natural gas mass flow rate data;

[0088] S3. Based on the gas density, pressure, and temperature of the hydrogen-containing natural gas obtained in step S1, calculate the compressibility factor for the corresponding hydrogen blending ratio using the compressibility factor algorithm.

[0089] The specific formula for the compression factor algorithm is as follows:

[0090]

[0091] Where Z represents the compressibility factor, P represents the pressure, T represents the temperature, ρ represents the density, and R represents the proportionality constant;

[0092] For any ideal gas, R is constant and approximately 8.31441 ± 0.00026 J / (mol·K);

[0093] S4. Substitute the compression factor data obtained in step S3 into the volumetric flow rate algorithm to obtain the corrected volumetric flow rate count value of the volumetric flow meter to be calibrated.

[0094] The specific formula for the volumetric flow rate algorithm is as follows:

[0095]

[0096] Where V represents the corrected volumetric flow rate of the volumetric flow meter to be calibrated, Z represents the compressibility factor, P represents the pressure, T represents the temperature, and R represents the proportionality constant.

[0097] Preferably, before incorporating the compressibility factor data into the volumetric flow rate algorithm, the following steps are also included:

[0098] Obtain the compressibility factor for multiple different hydrogen doping ratios;

[0099] By fitting multiple compression factors, compression factor curves are obtained;

[0100] Based on the compression factor curve, the compression factor data at the predetermined hydrogen doping ratio is obtained.

[0101] By fitting the compressibility factor data under multiple different hydrogen doping ratios, a compressibility factor curve can be obtained. From the compressibility factor curve, the compressibility factor under any hydrogen doping ratio can be obtained. Substituting this curve into the volumetric flow rate algorithm, the standard volumetric flow rate count value of the volumetric flow meter to be calibrated under any hydrogen doping ratio can be obtained.

[0102] In this embodiment, the compressibility factor is 1 under ideal gas conditions, but it is not 1 under different pressures, temperatures, and composition conditions. The calibration method in this embodiment yields accurate compressibility factor values ​​under different hydrogen doping ratios and pressures, resulting in a compressibility factor data table or curve. By embedding this data table or curve into the flowmeter volumetric flow rate calculation program, an accurate flowmeter volumetric flow rate can be obtained.

[0103] Then, the calculated volumetric flow rate count value is compared with the actual count value of the volumetric flow meter to be calibrated, thereby adjusting the count of the volumetric flow meter to be calibrated so that its actual count value is consistent with the volumetric flow rate count value obtained by the solution.

[0104] Example 4:

[0105] Performance calibration equipment for hydrogen-containing natural gas volumetric flow meters, including:

[0106] At least one processor, and at least one memory communicatively connected to the processor;

[0107] The memory stores program instructions that can be executed by the processor, and the processor calls the program instructions to execute the calibration method as described in Embodiment 3.

[0108] Example 5:

[0109] A computer-readable storage medium storing computer instructions that cause a computer to perform the calibration method as described in Example 3.

[0110] 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.

[0111] It should be noted that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding and reading. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and objectives of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

Claims

1. A performance calibration system for hydrogen-containing natural gas volumetric flow meter, characterized in that, It includes hydrogen pipelines, natural gas pipelines, and hydrogen-containing gas transmission pipelines, wherein the outlet ends of the hydrogen pipelines and natural gas pipelines are connected to the inlet end of the hydrogen-containing gas transmission pipeline. The hydrogen pipeline is equipped with a first standard mass flow measurement unit (3) for detecting the hydrogen mass flow rate. The natural gas pipeline is equipped with a second standard mass flow measurement unit (12) for detecting the mass flow rate of natural gas. The hydrogen-containing gas pipeline is equipped with a volumetric flow meter (9) for detecting the mass flow rate of hydrogen-containing natural gas. The hydrogen-containing gas pipeline is also equipped with a density measuring unit (7), a first pressure measuring unit (8), and a first temperature measuring unit (10) for detecting the gas density, pressure, and temperature of hydrogen-containing natural gas, respectively. Also includes: The data acquisition unit is used to collect the hydrogen mass flow rate, natural gas mass flow rate, gas density of hydrogen-containing natural gas, pressure of hydrogen-containing natural gas and temperature of hydrogen-containing natural gas detected by the first standard mass flow rate measurement unit (3), the second standard mass flow rate measurement unit (12), the density measurement unit (7), the first pressure measurement unit (8) and the first temperature measurement unit (10); The hydrogen blending ratio calculation module calculates the hydrogen blending ratio based on the mass flow rate of hydrogen and natural gas collected by the data acquisition unit. The compressibility factor calculation module calculates the compressibility factor for the corresponding hydrogen blending ratio based on the gas density, pressure, and temperature of the hydrogen-containing natural gas collected by the data acquisition unit. The volumetric flow rate calculation module calculates the actual volumetric flow rate of hydrogen-containing natural gas based on the compressibility factor and the volumetric flow rate algorithm.

2. The performance calibration system for hydrogen-containing natural gas volumetric flow meter according to claim 1, characterized in that, The inlet end of the hydrogen-containing gas pipeline is provided with a gas mixing zone (6) for buffering gas fluctuations.

3. The performance calibration system for hydrogen-containing natural gas volumetric flow meter according to claim 1, characterized in that, The inlet ends of the hydrogen pipeline and the natural gas pipeline are respectively provided with a first valve (1) and a second valve (11), and also include a control unit (15) electrically connected to the first valve (1) and the second valve (11). The control unit (15) is used to adjust the flow rate of the first valve (1) and the second valve (11).

4. The performance calibration system for hydrogen-containing natural gas volumetric flow meter according to claim 3, characterized in that, A sampling and analysis unit (5) is installed on the hydrogen-containing gas pipeline. The sampling and analysis unit (5) is used to obtain the hydrogen blending ratio of hydrogen-containing natural gas and to feed back the hydrogen blending ratio of the hydrogen-containing gas transmission pipeline to the control unit (15). The control unit (15) adjusts the flow rate of the first valve (1) and the second valve (11) according to the received hydrogen doping ratio to achieve the set hydrogen doping ratio.

5. The performance calibration system for a hydrogen-containing natural gas volumetric flow meter according to claim 4, characterized in that, The sampling and analysis unit (5) is located at the inlet end of the hydrogen-containing gas pipeline.

6. The performance calibration system for a hydrogen-containing natural gas volumetric flow meter according to claim 1, characterized in that, The hydrogen pipeline is equipped with a second pressure measuring unit (2) and a second temperature measuring unit (4) for detecting hydrogen pressure and temperature, respectively.

7. The performance calibration system for a hydrogen-containing natural gas volumetric flow meter according to claim 1, characterized in that, The natural gas pipeline is equipped with a third pressure measuring unit (13) and a third temperature measuring unit (14) for detecting natural gas pressure and temperature, respectively.

8. The performance calibration system for a hydrogen-containing natural gas volumetric flow meter according to claim 7, characterized in that, Also includes: The error calculation module calculates the measurement error based on the actual volumetric flow rate calculated by the volumetric flow rate calculation module and the measured volumetric flow rate measured by the volumetric flow meter to be calibrated (9).

9. A method for calibrating the performance of a hydrogen-containing natural gas volumetric flow meter, the method being based on the hydrogen-containing natural gas volumetric flow meter performance calibration system described in claim 1, characterized in that, Includes the following steps: S1. Obtain the hydrogen mass flow rate, natural gas mass flow rate, gas density of hydrogen-containing natural gas, and pressure of hydrogen-containing natural gas. and the temperature of hydrogen-containing natural gas; S2. Calculate the hydrogen blending ratio based on the mass flow rate of hydrogen and natural gas obtained in step S1, using the mass ratio. S3. Based on the gas density, pressure, and temperature of the hydrogen-containing natural gas obtained in step S1, calculate the compressibility factor for the corresponding hydrogen blending ratio using the compressibility factor algorithm. S4. Based on the compression factor obtained in step S3, calculate the actual volumetric flow rate of hydrogen-containing natural gas using a volumetric flow rate algorithm.

10. The performance calibration method for a hydrogen-containing natural gas volumetric flow meter according to claim 9, characterized in that, Before proceeding to step S4, the following is also included: Obtain the compressibility factor for multiple different hydrogen doping ratios; By fitting multiple compression factors, compression factor curves are obtained; Based on the compression factor curve, the compression factor data at the predetermined hydrogen doping ratio is obtained.

11. A performance calibration device for hydrogen-containing natural gas volumetric flow meter, characterized in that, include: At least one processor, and at least one memory communicatively connected to the processor; The memory stores program instructions that can be executed by the processor, and the processor calls the program instructions to execute the calibration method as described in claim 9 or 10.

12. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that cause the computer to perform the calibration method as described in claim 9 or 10.

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