Method and equipment for accurately controlling hydrogen doping proportion of natural gas

Abstract

The invention is suitable for the field of fuel gas processing, and provides a method and equipment for accurately controlling the hydrogen doping proportion of natural gas, a natural gas conveying pipe, a hydrogen conveying pipe and a mixing barrel, one end of the natural gas conveying pipe and one end of the hydrogen conveying pipe are communicated with the interior of the mixing barrel, and a natural gas inlet is formed in the other end of the natural gas conveying pipe; the other end of the hydrogen conveying pipe is provided with a hydrogen inlet, and the end, back to the natural gas conveying pipe, of the mixing cylinder is communicated with a mixed gas outlet pipe. When the device is used, two gas input pipelines are connected to the mixer, one pipeline is a natural gas input channel, the other pipeline is a hydrogen input channel, filtered impurities are iron rust substances falling off from the interiors of the pipelines and solid dust mixed in the gas, natural gas and hydrogen are input into the mixer to be heated and mixed, and the mixed gas is filtered out. The mixer is provided with an impeller for stirring air to generate exchange, after natural gas and hydrogen are heated, the activity degree of air molecules is increased, and the spiral belt in the spiral wave shape and spiral wind have higher contact and heat transfer efficiency.

Description

Technical Field

[0001] The present invention belongs to the field of gas processing, and particularly relates to a method and device for precisely controlling the hydrogen blending ratio of natural gas. Background Art

[0002] With the development of industrial technology, modern gas processing technology has become increasingly perfect, and the application scenarios of gas hydrogen blending skids widely cover civil, industrial, and infrastructure fields. In the civil aspect, it not only supports hydrogen blending into households to reduce household carbon emissions, but also can be adapted to terminal equipment such as gas stoves and boilers to improve combustion efficiency and reduce pollutant emissions; in the industrial field, hydrogen-blended gas is used in processes such as iron and steel smelting and petroleum refining to replace traditional energy and optimize production costs. Moreover, a gas hydrogen blending skid is an integrated and modular special equipment mainly used to blend hydrogen into natural gas at a specific ratio to form hydrogenated compressed natural gas (HCNG), and achieve safe transportation or direct application through the existing natural gas pipeline network. Its core function is to achieve efficient mixing of hydrogen and natural gas through dynamic adjustment technology, and the typical hydrogen blending ratio range is 10% - 20%; A device and method for extracting and transporting hydrogen in hydrogenated compressed natural gas disclosed in Patent CN113566113B. The device includes at least one magnesium-based solid-state hydrogen storage and transportation device. The magnesium-based solid-state hydrogen storage and transportation device includes a hydrogen storage chamber, and the hydrogen storage chamber includes a storage cavity containing magnesium-based solid-state hydrogen storage material and a heat exchange cavity for circulating a heat exchange medium. The storage cavity is connected to the natural gas pipeline through an inlet pipe and an outlet pipe. The inlet pipe is provided with a first hydrogen concentration detector, a first flow meter, and a first valve, and the outlet pipe is also provided with a second hydrogen concentration detector, a second flow meter, and a second valve. The heat exchange cavity is provided with an inlet and an outlet connected to the outside. After the hydrogenated compressed natural gas is transported over a long distance in the natural gas pipeline, near hydrogen-consuming units such as hydrogen refueling stations, the magnesium-based solid-state hydrogen storage and transportation device is used to absorb and store the hydrogen in the natural gas pipeline and transport it to the hydrogen-consuming unit, solving the problem of transporting hydrogen over a distance of hundreds of kilometers between the natural gas pipeline and the hydrogen-consuming unit; This device still has defects when in use. First, the hydrogen blending ratio range of this device is relatively small, and there will be more carbon element emissions during the combustion of this gas. Second, the pipeline of the natural gas hydrogen blending device is relatively long, and thus the pipeline is prone to abnormal conditions. If these abnormal conditions are not processed in a timely manner, it will affect the processing efficiency. Summary of the Invention

[0003] The object of the present invention is to provide a method and device for precisely controlling the hydrogen blending ratio of natural gas in view of the deficiencies of the prior art. When the device is in use, two pipelines for inputting gases are connected to the mixer, one of which is a natural gas input channel and the other is a hydrogen input channel. During the input process of natural gas and hydrogen, impurities inside are filtered out by a filter. The impurities filtered are rust substances shed from the inner wall of the pipeline and solid dust mixed in the gas. Natural gas and hydrogen are input into the mixer for heating and mixing. The mixer has an impeller to stir the air to generate convection. After being heated, natural gas and hydrogen will increase the activity of air molecules. The spiral belt in a spiral wave shape has a greater contact and heat transfer efficiency with the spiral wind, so that the two kinds of air molecules can be mixed together more quickly, thereby solving the problems mentioned in the background art.

[0004] To solve the above problems, the present invention provides the following technical solutions: A method for precisely controlling the hydrogen blending ratio of natural gas, comprising the following steps: S1. Connect two pipelines for inputting gases to the mixer, one of which is a natural gas input channel and the other is a hydrogen input channel. During the input process of natural gas and hydrogen, impurities inside are filtered out by a filter. The impurities filtered are rust substances shed from the inner wall of the pipeline and solid dust mixed in the gas; S2. Natural gas and hydrogen are input into the mixer for heating and mixing. After being heated, natural gas and hydrogen will increase the activity of air molecules, so that the two kinds of air molecules can be mixed together more quickly. And the mixer has an impeller to stir the air to generate convection. The mixed gas is transported out through the exhaust channel at the tail of the mixer; S3. Control modules and safety modules are arranged in the middle of the natural gas input channel, hydrogen input channel and exhaust channel. The control module includes a flow meter, a pressure sensor and a PLC system inside the pipeline. The parameters of the three pipelines are fed back and adjusted in real time through the control module. The safety module includes overpressure protection, leakage alarm and emergency cut-off valve. An overpressure relief valve is set for overpressure protection. When the air pressure passes through the critical value, the excess gas will be automatically discharged.

[0005] An implementation device for a method for precisely controlling the hydrogen blending ratio of natural gas, comprising a natural gas pipeline, a hydrogen pipeline and a mixing cylinder. One ends of the natural gas pipeline and the hydrogen pipeline are respectively connected to the inside of the mixing cylinder. The other end of the natural gas pipeline is provided with a natural gas inlet, and the other end of the hydrogen pipeline is provided with a hydrogen connection port. The end of the mixing cylinder facing away from the natural gas pipeline is connected to a mixed gas outlet pipe. The tail end of the mixed gas outlet pipe is provided with a mixed gas outlet. An air analyzer is arranged on the mixed gas outlet pipe. A mixing mechanism is arranged inside the mixing cylinder. Filter mechanisms, control mechanisms, alarm mechanisms and overpressure mechanisms are arranged on both the natural gas pipeline and the hydrogen pipeline.

[0006] Furthermore, the mixing mechanism includes a stepping motor fixedly arranged inside the mixing cylinder. The output end of the stepping motor is provided with a stirring rod, and an impeller is arranged on the side wall of the stirring rod. A heating mechanism is arranged outside the impeller.

[0007] Furthermore, the heating mechanism includes a spiral belt. The cross-section of the spiral belt is rectangular, and a circulating water channel is arranged inside the spiral belt. The path of the spiral belt is in a spiral wave shape. Both ends of the spiral belt are provided with external connecting pipes, and the external connecting pipes extend to the outer side wall of the mixing cylinder. The ports of the external connecting pipes are connected to circulating hot water.

[0008] Furthermore, for the air analyzer detection tower, the detection tower transmits the air component ratio parameters to the computer terminal in real time through wireless devices.

[0009] Furthermore, the filtering mechanism includes a filter. A filtering channel is arranged inside the filter, and the path of the filtering channel is U-shaped. A sponge strip is stuffed inside the filtering channel.

[0010] Furthermore, the control mechanism includes a flow meter and a pressure sensor inside the pipe. The flow meter and the pressure sensor enable the control mechanism to adjust the flow rate and pressure through a feedback system to stabilize the gas transmission.

[0011] Furthermore, the alarm mechanism also includes a leakage detector and an emergency cut-off valve. The leakage detector transmits the leakage information to the alarm mechanism, and the alarm mechanism activates the emergency cut-off valve to cut off all pipelines and upload the alarm information to the computer terminal.

[0012] Furthermore, the overpressure mechanism includes an air overflow device. A pressure gauge is arranged on one side of the air overflow device. A pressure box is arranged at the top of the air overflow device. A pressure relief box is arranged at the top of the pressure box. A central pressure relief channel is arranged in the middle of the pressure relief box. Auxiliary pressure relief channels are arranged on both sides of the pressure relief box. Return springs are arranged inside both the central pressure relief channel and the auxiliary pressure relief channels. Pressure pistons are arranged at the ends of the return springs. The three pressure pistons are attached to the inner side walls of the central pressure relief channel and the auxiliary pressure relief channels.

[0013] Compared with the prior art, the embodiments of the present application mainly have the following beneficial effects: First, when the device is in use, two gas input pipes are connected to the mixer. One is the natural gas input channel, and the other is the hydrogen input channel. During the input of natural gas and hydrogen, the impurities inside are filtered out by a filter. The impurities filtered are rust substances shed from the inner wall of the pipe and solid dust mixed in the gas. Natural gas and hydrogen are input into the mixer for heating and mixing. The mixer has an impeller to stir the air to generate convection. After natural gas and hydrogen are heated, the activity of air molecules increases. The spiral belt in a spiral wave shape has a greater contact and heat transfer efficiency with the spiral wind, so that the two kinds of air molecules can be mixed together more quickly.

[0014] Second, if the pressure inside the pipeline suddenly becomes abnormal, the high pressure inside the pipeline will push the pressure piston inside the central pressure relief channel upward. When the pressure piston exceeds the port of the central pressure relief channel, the excess pressure is discharged. The auxiliary pressure relief channel is used as a backup to prevent the central pressure relief channel from being blocked. This mechanical pressure relief method has a lower failure rate compared to the electrical pressure relief method. Brief Description of the Drawings

[0015] Figure 1 It is a front view schematic diagram of the present invention.

[0016] Figure 2 It is a rear view schematic diagram of the present invention.

[0017] Figure 3 It is a schematic diagram of the natural gas pipeline and the mixing cylinder of the present invention.

[0018] Figure 4 It is a schematic diagram of the natural gas pipeline and the mixing cylinder of the present invention from a second perspective.

[0019] Figure 5 It is a schematic diagram of the hydrogen pipeline of the present invention.

[0020] Figure 6 It is a schematic diagram of the filter of the present invention.

[0021] Figure 7 It is a schematic diagram of the air overflow device of the present invention.

[0022] Figure 8 It is a schematic diagram of the pressure piston of the present invention.

[0023] Figure 9 It is a schematic diagram of the mixing cylinder of the present invention.

[0024] Figure 10 It is a schematic diagram of the spiral belt of the present invention.

[0025] Description of the Reference Numerals: Natural gas transmission pipe 1, natural gas inlet 101, detection tower 102, hydrogen transmission pipe 2, hydrogen connection port 201, hydrogen inlet 202, filter 3, filtering channel 301, mixing cylinder 4, spiral belt 401, external connection pipe 402, stepper motor 403, stirring rod 404, impeller 405, mixed gas outlet pipe 5, mixed gas outlet 501, air release device 6, pressure relief box 601, central pressure relief channel 602, auxiliary pressure relief channel 603, return spring 604, pressure piston 605, pressure box 7, pressure gauge 8. Specific embodiments

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and not to describe a specific order.

[0027] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0028] The present invention provides a method for precisely controlling the hydrogen blending ratio of natural gas, comprising the following steps: S1. Connect two pipes for inputting gases to the mixer, one of which is a natural gas input channel and the other is a hydrogen input channel. During the input of natural gas and hydrogen, the impurities inside are filtered out by the filter, and the impurities filtered are rust substances peeled off from the inner wall of the pipe and solid dust mixed in the gas. S2. Natural gas and hydrogen are input into the mixer for heating and mixing. After being heated, the activity of air molecules of natural gas and hydrogen will increase, and then the two kinds of air molecules can be mixed together more quickly. Moreover, the mixer has an impeller to stir the air for exchange, and the mixed gas is transported out through the exhaust channel at the tail of the mixer. In the middle of the natural gas input channel, hydrogen input channel, and exhaust channel, a control module and a safety module are both provided. The control module includes a flow meter, a pressure sensor, and a PLC system inside the pipe. The three pipe bodies can provide real-time feedback and adjust parameters through the control module. The safety module includes overpressure protection, leakage alarm, and an emergency cut-off valve. The overpressure protection is equipped with a pressure relief valve, and when the air pressure exceeds the critical value, the excess gas will be automatically discharged.

[0029] In this example, the hydrogen-doped skid of the present invention can increase the hydrogen-doping ratio to 30%, achieving a 60%-80% reduction in carbon emissions. In the industrial field, the Jingmen project of SPIC generates electricity through hydrogen-doped combustion of gas turbines, and the feedback mechanism of the control module of the present invention can accurately control the hydrogen-doping ratio to obtain a uniform mixed gas.

[0030] An implementation device for a method of accurately controlling the hydrogen-doping ratio of natural gas, as Figures 1-10 shown, includes a natural gas pipeline 1, a hydrogen pipeline 2, and a mixing cylinder 4. One ends of the natural gas pipeline 1 and the hydrogen pipeline 2 are respectively connected to the inside of the mixing cylinder 4. The other end of the natural gas pipeline 1 is provided with a natural gas inlet 101, and the other end of the hydrogen pipeline 2 is provided with a hydrogen gas connection port 201. One end of the mixing cylinder 4 facing away from the natural gas pipeline 1 is connected to a mixed gas outlet pipe 5. The tail end of the mixed gas outlet pipe 5 is provided with a mixed gas outlet 501. An air analyzer is provided on the mixed gas outlet pipe 5. A mixing mechanism is provided inside the mixing cylinder 4. Filtering mechanisms, control mechanisms, alarm mechanisms, and overpressure mechanisms are provided on both the natural gas pipeline 1 and the hydrogen pipeline 2.

[0031] In this embodiment, natural gas and hydrogen are respectively input into the mixing cylinder 4 from the natural gas inlet 101 and the hydrogen gas connection port 201 for further gas mixing operation. The filtering mechanism can remove impurities in the source gas, and the control mechanism can accurately control the hydrogen-doping ratio.

[0032] In a further embodiment of the present invention, as Figures 9-10 shown, the mixing mechanism includes a stepping motor 403 fixedly arranged inside the mixing cylinder 4. The output end of the stepping motor 403 is provided with a stirring rod 404. An impeller 405 is provided on the side wall of the stirring rod 404. A heating mechanism is provided outside the impeller 405.

[0033] In this embodiment, during the process of the stepping motor 403 driving the impeller 405 to rotate, the gas inside the mixing cylinder 4 will form a spiral airflow from one end to the other end. The hydrogen pipeline 2 is connected to the side wall of the mixing cylinder 4 and directly injects natural gas into the spiral airflow.

[0034] In a further embodiment of the present invention, as Figures 9-10As shown, the heating mechanism includes a spiral belt 401. The cross-section of the spiral belt 401 is rectangular, and a circulating water channel is provided inside the spiral belt 401. The path of the spiral belt 401 is in a spiral wave shape. Both ends of the spiral belt 401 are provided with external connecting pipes 402. The external connecting pipes 402 extend to the outer wall of the mixing cylinder 4, and the ports of the external connecting pipes 402 are connected to circulating hot water.

[0035] In this embodiment, the spiral belt 401 with a spiral wave shape has a greater contact and heat transfer efficiency with the spiral wind. After natural gas and hydrogen are heated, the activity of air molecules will increase, and then the two kinds of air molecules can be mixed together more quickly.

[0036] In a further embodiment of the present invention, as Figures 1-6 shown, the air analyzer detection tower 102 transmits the air component ratio parameters to the computer terminal in real time through wireless devices.

[0037] In this embodiment, the staff observes the information on the computer terminal to detect the normal operation of the equipment. If the air component ratio is abnormal, the equipment will be stopped for debugging.

[0038] In a further embodiment of the present invention, as Figures 1-6 shown, the filtering mechanism includes a filter 3. A filtering channel 301 is provided inside the filter 3. The path of the filtering channel 301 is in a U shape, and a sponge strip is stuffed inside the filtering channel 301.

[0039] In this embodiment, during the input of natural gas and hydrogen, the filter 3 filters out the impurities inside, and the impurities filtered are the rust substances peeled off from the inner wall of the pipeline and the solid dust mixed in the gas.

[0040] In a further embodiment of the present invention, as Figures 1-5 shown, the control mechanism includes a flow meter and a pressure sensor inside the pipe. The flow meter and the pressure sensor enable the control mechanism to adjust the flow rate and pressure through a feedback system to stabilize the gas transmission.

[0041] In this embodiment, if the flow rate and pressure inside the pipe body deviate from the preset values, the control mechanism can adjust them in real time through a feedback mechanism.

[0042] In a further embodiment of the present invention, as Figures 1-5 shown, the alarm mechanism further includes a leakage detector and an emergency cut-off valve. The leakage detector transmits the leakage information to the alarm mechanism, and the alarm mechanism activates the emergency cut-off valve to cut off all pipelines and upload the alarm information to the computer terminal.

[0043] In this embodiment, when air leakage occurs in the equipment pipeline, all processing operations will be automatically and emergently stopped to avoid the occurrence of further dangers.

[0044] In a further embodiment of the present invention, as Figures 7-8 shown, the overpressure mechanism includes an air overflow device 6. A pressure gauge 8 is provided on one side of the air overflow device 6. A pressure box 7 is provided at the top of the air overflow device 6. A pressure relief box 601 is provided at the top of the pressure box 7. A central pressure relief channel 602 is provided in the middle of the pressure relief box 601. Auxiliary pressure relief channels 603 are provided on both sides of the pressure relief box 601. A return spring 604 is provided inside both the central pressure relief channel 602 and the auxiliary pressure relief channel 603. A pressure piston 605 is provided at the end of the return spring 604. The three pressure pistons 605 are attached to the inner side walls of the central pressure relief channel 602 and the auxiliary pressure relief channel 603.

[0045] In this embodiment, if the pressure inside the pipeline suddenly becomes abnormal, the high air pressure inside the pipeline will push the pressure piston 605 inside the central pressure relief channel 602 upwards. When the pressure piston 605 exceeds the port of the central pressure relief channel 602, the excess pressure is discharged. The auxiliary pressure relief channel 603 serves as a backup to prevent the central pressure relief channel 602 from being blocked. This mechanical pressure relief method has a lower failure rate compared to the electrical pressure relief method.

[0046] It should be noted that for the foregoing embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, certain steps may be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0047] In several embodiments provided by the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the above-mentioned unit division may have other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or communication connection between each other can be through some interfaces. The indirect coupling or communication connection between devices or units can be in the form of telecommunications or other forms.

[0048] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed over multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0049] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the protection scope of the invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on these embodiments, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art can still, without conflict and without creative efforts, combine, add or delete the features in the embodiments of the present invention according to the circumstances, or make other adjustments, so as to obtain different technical solutions that essentially do not deviate from the concept of the present invention, and these technical solutions also belong to the scope of protection of the present invention.

Claims

1. A method for accurately controlling the proportion of hydrogen blended into natural gas, characterized in that: The following steps are involved: S1. Two gas input pipes are connected to the mixer, one of which is a natural gas input channel and the other is a hydrogen input channel. During the natural gas and hydrogen input process, impurities inside the gas are filtered out by filters, wherein the impurities filtered out are rust materials falling off the inside of the pipe and solid dust mixed in the gas; S2. Natural gas and hydrogen are input into the mixer for heating and mixing. The heating of natural gas and hydrogen will increase the activity of air molecules, so that the two air molecules can be mixed together more quickly. The mixer has an impeller to stir the air for exchange, and the mixed gas is transported out from the exhaust channel at the rear of the mixer; S3. Control modules and safety modules are installed in the middle of the natural gas input channel, hydrogen input channel and exhaust channel. The control module includes a flow meter, a pressure sensor and a PLC system inside the pipe. The three pipe bodies can provide real-time feedback and adjust parameters through the control module. The safety module includes overpressure protection, leakage alarm and emergency shut-off valve. A pressure relief valve is installed for overpressure protection. When the air pressure exceeds the critical value, the excess gas will be automatically discharged.

2. An implementation device for a method for accurately controlling the ratio of hydrogen blended into natural gas, characterized in that: The invention comprises a natural gas transmission pipe (1), a hydrogen transmission pipe (2) and a mixing cylinder (4), wherein one end of the natural gas transmission pipe (1) and the hydrogen transmission pipe (2) are respectively connected to the interior of the mixing cylinder (4), the other end of the natural gas transmission pipe (1) is provided with a natural gas inlet (101), and the other end of the hydrogen transmission pipe (2) is provided with a hydrogen inlet (201). The end of the mixing cylinder (4) facing away from the natural gas transmission pipe (1) is connected to a mixed gas outlet pipe (5), the tail end of the mixed gas outlet pipe (5) is provided with a mixed gas outlet (501), an air analyzer is provided on the mixed gas outlet pipe (5), a mixing mechanism is provided inside the mixing cylinder (4), and a filtering mechanism, a control mechanism, an alarm mechanism and a pressure overflow mechanism are provided on both the natural gas transmission pipe (1) and the hydrogen transmission pipe (2).

3. The device for implementing the method for accurately controlling the hydrogen blending ratio of natural gas according to claim 2 is characterized in that: The mixing mechanism comprises a stepping motor (403) fixedly arranged inside a mixing cylinder (4); a stirring rod (404) is arranged at the output end of the stepping motor (403); an impeller (405) is arranged on the side wall of the stirring rod (404); and a heating mechanism is arranged on the outer side of the impeller (405).

4. The device for implementing the method for accurately controlling the hydrogen blending ratio of natural gas according to claim 3 is characterized in that: The heating mechanism comprises a spiral belt (401), the cross section of the spiral belt (401) is rectangular, a circulating water channel is arranged inside the spiral belt (401), the path of the spiral belt (401) is in a spiral wave shape, and external pipes (402) are arranged at both ends of the spiral belt (401), the external pipes (402) extend to the outer side wall of the mixing cylinder (4), and the port of the external pipe (402) is connected to the circulating hot water.

5. The device for implementing the method for accurately controlling the hydrogen blending ratio of natural gas according to claim 2 is characterized in that: The air analyzer detection tower (102) transmits the air component ratio parameters to the computer end in real time via a wireless device.

6. The device for implementing the method for accurately controlling the hydrogen blending ratio of natural gas according to claim 2 is characterized in that: The filtering mechanism comprises a filter (3), a filtering channel (301) is arranged inside the filter (3), the path of the filtering channel (301) is U-shaped, and a sponge strip is inserted into the inside of the filtering channel (301).

7. The device for implementing the method for accurately controlling the hydrogen blending ratio of natural gas according to claim 2 is characterized in that: The control mechanism includes a flow meter and a pressure sensor inside the pipe. The flow meter and the pressure sensor allow the control mechanism to adjust the flow rate and pressure through a feedback system to stabilize the gas transmission.

8. The device for implementing the method for accurately controlling the hydrogen blending ratio of natural gas according to claim 2 is characterized in that: The alarm mechanism also includes a leak detector and an emergency shut-off valve. The leak detector transmits the leakage information to the alarm mechanism, and the alarm mechanism activates the emergency shut-off valve to cut off all pipelines and upload the alarm information to the computer.

9. The device for implementing the method for accurately controlling the hydrogen blending ratio of natural gas according to claim 2 is characterized in that: The pressure relief mechanism comprises an air overflow device (6), a pressure gauge (8) is arranged on one side of the air overflow device (6), a pressure box (7) is arranged at the top of the air overflow device (6), a pressure relief box (601) is arranged at the top of the pressure box (7), a central pressure relief channel (602) is arranged in the middle of the pressure relief box (601), auxiliary pressure relief channels (603) are arranged on both sides of the pressure relief box (601), return springs (604) are arranged inside the central pressure relief channel (602) and the auxiliary pressure relief channel (603), and pressure pistons (605) are arranged at the ends of the return springs (604), and three pressure pistons (605) are attached to the inner side walls of the central pressure relief channel (602) and the auxiliary pressure relief channel (603).

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