Hydrogen-doped static mixing device

Abstract

The utility model provides a kind of static mixing device of hydrogen doping, including natural gas conveying unit, hydrogen conveying unit, pipeline mixer and monitoring control unit, by setting switchable hydrogen doping proportion adaptation interface in hydrogen conveying side and mixed output side, the smooth transition of the stable transition of the first phase 5% volume ratio, the second phase 35% volume ratio hydrogen doping demand is realized;Pipeline mixer adopts pipeline structure and is built-in multiple groups of spiral guide vanes, ensure that natural gas and hydrogen are efficiently and uniformly mixed;Overall equipment is integrated in skid, adapt to existing energy station pipe network layout, reduce the complexity of transformation.The utility model can stably output hydrogen-doped natural gas that meets the requirements of gas turbine, ensure combustion efficiency and reduce NOx emissions, and is suitable for distributed energy station gas turbine hydrogen doping project.

Description

Technical Field

[0001] This utility model relates to the field of energy mixing technology, and in particular to a static mixing device for hydrogen doping. Background Technology

[0002] With the increasing demand for clean energy utilization, natural gas blending with hydrogen has become a crucial technology for reducing carbon emissions and is widely used in gas turbine systems of distributed energy stations. Existing natural gas hydrogen blending devices mostly employ simple pipeline mixing methods, which present the following problems: First, the mixing uniformity is poor; the large density difference between natural gas and hydrogen easily leads to stratification, affecting the combustion stability of the gas turbine. Second, the adaptability of the hydrogen blending ratio is insufficient; most devices only support a single hydrogen blending ratio, making it difficult to meet the needs of increasing the hydrogen blending ratio during phased construction. Utility Model Content

[0003] The purpose of this invention is to provide a hydrogen-doped static mixing device to solve the above-mentioned technical problems.

[0004] This utility model provides a static mixing device for hydrogen blending, including a natural gas delivery unit, a hydrogen delivery unit, a pipeline mixer, and a monitoring and control unit. The natural gas delivery unit includes a natural gas intake port, a natural gas filter, a natural gas flow meter, a natural gas pressure regulator, and a first emergency shut-off valve connected in series. The output end of the first emergency shut-off valve is sealed to the first input end of the pipeline mixer. The hydrogen delivery unit includes a hydrogen unloading column, a hydrogen filter, a hydrogen pressure regulating skid, a hydrogen flow meter, and a second emergency shut-off valve connected in series. A hydrogen-side blending ratio is connected in series between the output end of the second emergency shut-off valve and the second input end of the pipeline mixer. Example of an adapter interface; multiple sets of spiral guide vanes are evenly distributed along the axial direction on the inner wall of the pipeline mixer; a hydrogen blending ratio adapter interface is connected in series at the output end of the pipeline mixer, and the output end of the hydrogen blending ratio adapter interface is used to connect to the inlet pipeline of the gas turbine pre-module; the monitoring and control unit includes a DCS controller and a chromatograph, the sampling probe of the chromatograph is sealed to the pipeline downstream of the hydrogen blending ratio adapter interface, and the proportional adjustment module in the DCS controller is electrically connected to the natural gas flow meter and the hydrogen flow meter respectively, and the proportional adjustment module is used to adjust the hydrogen input according to the flow signal of the natural gas flow meter.

[0005] This invention utilizes a switchable adapter interface between the hydrogen side and the mixing output side, allowing for a smooth transition between 5% hydrogen blending in Phase I and 35% in Phase II simply by replacing components. This eliminates the need for overall equipment modification, reducing modification costs and shortening downtime. Multiple sets of spiral guide vanes form a multi-stage rotating shear flow, effectively solving the stratification problem caused by the density difference between natural gas and hydrogen, improving uniform mixing, and ensuring the combustion stability of the gas turbine. Attached Figure Description

[0006] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0007] Figure 1 This is a schematic diagram of the structure of this utility model; Explanation of reference numerals in the attached figures: In the diagram: 1-Pipeline mixer, 2-Natural gas intake port, 3-Natural gas filter, 4-Natural gas flow meter, 5-Natural gas pressure regulator, 6-First emergency shut-off valve, 7-Hydrogen unloading column, 8-Hydrogen filter, 9-Hydrogen pressure regulating skid, 10-Hydrogen flow meter, 11-Second emergency shut-off valve, 12-Hydrogen side blending ratio adapter interface, 13-Helical guide vane, 14-Mixed output side blending ratio adapter interface, 15-DCS controller, 16-Chromatograph, 17-Safety venting path, 18-Flame arrester, 19-Nitrogen port; Detailed Implementation The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0008] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0009] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0010] Example 1 like Figure 1 As shown: A static mixing device for hydrogen blending includes a natural gas transportation unit, a hydrogen transportation unit, a pipeline mixer 1, and a monitoring and control unit. Each unit is connected by a sealed pipeline to form a complete natural gas hydrogen blending and transportation chain.

[0011] The natural gas transmission unit is used to process the raw natural gas from the energy station's natural gas pipeline network into a gas that meets the requirements for blending pressure and purity.

[0012] Natural gas intake interface 2 is located in the middle section of the DN200 natural gas pipeline main pipeline within the energy station. The left end is sealed to the main pipeline via a flange with a raised face design and a matching DN200 metal spiral wound gasket. The right end is connected to the input end of natural gas filter 3 by welding. The welding method is argon arc welding, and the weld joint must be 100% radiographically inspected to ensure there is no risk of leakage.

[0013] The natural gas filter 3 is located at the right end of the natural gas intake interface 2; the input end of the natural gas filter 3 is connected to the natural gas intake interface 2, and the output end of the natural gas filter 3 is connected to the input end of the natural gas flow meter 4; the natural gas filter 3 body adopts a flange-type opening cover structure and has a built-in stainless steel filter screen, which is convenient for periodic disassembly and cleaning of impurities.

[0014] The natural gas flow meter 4 is a gas turbine flow meter with temperature and pressure compensation function. The input end of the flow meter 4 is connected to the output end of the natural gas filter 3 through a flange, and the output end of the natural gas flow meter 4 is connected to the input end of the natural gas pressure regulator 5 through a flange. The signal output end of the natural gas flow meter 4 is electrically connected to the DCS controller 15 through a shielded cable to transmit natural gas flow data in real time.

[0015] The natural gas pressure regulator 5 is a pilot-operated natural gas pressure regulator. The input end of the natural gas pressure regulator 5 is connected to the output end of the natural gas flow meter 4 through a flange, and the output end of the natural gas pressure regulator 5 is connected to the input end of the first emergency shut-off valve 6 through a flange. The natural gas pressure regulator 5 has a built-in pressure feedback diaphragm, which can automatically adjust the opening degree according to the downstream flow changes to ensure stable output pressure.

[0016] The first emergency shut-off valve 6 is a pneumatic ball valve located at the right end of the natural gas pressure regulator 5. The input end of the first emergency shut-off valve 6 is connected to the output end of the natural gas pressure regulator 5 via a flange, and the output end of the first emergency shut-off valve 6 is sealed to the first input end of the pipeline mixer 1 via a flange. The pneumatic actuator of the first emergency shut-off valve 6 is connected to the instrument air source of the energy station via an instrument air pipeline, and the control signal end is electrically connected to the DCS controller 15 via a cable, enabling remote switching control.

[0017] The hydrogen delivery unit is used to process high-pressure hydrogen transported by long-tube trailers into low-pressure hydrogen at 3.95 MPa.

[0018] The hydrogen unloading column 7 is compatible with the dual-nozzle unloading interface of the long-tube trailer, with a working pressure of 5-20MPa, and is located in the unloading area of ​​the energy station. The outlet pipe at the lower end of the hydrogen unloading column 7 is a DN50 stainless steel pipe, which branches into the process conveying path and the safety venting path 17 through a PN25MPa tee connector. The process conveying path is connected to the input end of the hydrogen filter 8, and the safety venting path 17 is used for hydrogen discharge during unloading overpressure or equipment maintenance.

[0019] The input end of the hydrogen filter 8 is connected to the process conveying path of the hydrogen unloading column 7, and the output end of the hydrogen filter 8 is connected to the input end of the hydrogen pressure regulating skid 9. The body of the hydrogen filter 8 adopts a quick-opening clamp structure and has a built-in 316L stainless steel filter screen, which is convenient for quick monthly disassembly and cleaning.

[0020] The hydrogen pressure regulating skid 9 is a complete skid-mounted device located at the right end of the hydrogen filter 8. The skid contains two parallel pressure regulators (one for use and one for standby), a safety valve, and pressure gauges. All pipes and components inside the skid are made of 06Cr19Ni10 stainless steel. The pipe welding uses argon arc welding for the root pass and electric arc welding for the cover pass, and the weld joints need to undergo penetration testing. The input end of the hydrogen pressure regulating skid 9 is connected to the output end of the hydrogen filter 8, and the output end of the hydrogen pressure regulating skid 9 is connected to the input end of the hydrogen flow meter 10 by welding.

[0021] The hydrogen flow meter 10 adopts a gas turbine flow meter with temperature and pressure compensation function, and its range is 0-500 Nm when the hydrogen is added at 5% in the first phase. 3 / h, when the second phase has 35% hydrogen doping, the range is changed to 0-3000Nm. 3The flow meter 10 is of the same model as the flow meter 1h; the input end of the flow meter 10 is connected to the output end of the hydrogen pressure regulating skid 9, and the output end of the flow meter 10 is connected to the input end of the second emergency shut-off valve 11; the signal output end of the flow meter 10 is electrically connected to the DCS controller 15 through a shielded cable to transmit hydrogen flow data in real time.

[0022] The second emergency shut-off valve 11 is a pneumatic ball valve. The input end of the second emergency shut-off valve 11 is connected to the output end of the hydrogen flow meter 10, and the output end of the second emergency shut-off valve 11 is connected to the input end of the hydrogen side hydrogen blending ratio adapter interface 12. The pneumatic actuator of the second emergency shut-off valve 11 is connected to the instrument air source through the instrument air pipeline, and the control signal end is electrically connected to the DCS controller 15, which can realize remote emergency shut-off.

[0023] The hydrogen blending ratio adapter interface 12 is connected in series between the second emergency shut-off valve 11 and the second input terminal of the pipeline mixer 1, and includes two sets of switchable interface components; one set is a DN25 component adapted to 5% volume ratio hydrogen blending, and the other set is a DN50 component adapted to 35% volume ratio hydrogen blending. Both sets of components are made of stainless steel. When switching, only the flange bolts need to be removed and the corresponding component replaced. There is no need to modify the upstream and downstream pipelines, which effectively shortens the replacement time of a single set of components.

[0024] The safety venting path 17 is a stainless steel pipe, with a flame arrester 18 connected in series at the end and extending to the vent outlet. The flame arrester 18 is welded to the safety venting path 17 pipe, and the center of the flame arrester 18 is no more than 0.5m away from the vent outlet to ensure that external flames cannot flow back into the hydrogen unloading column 7.

[0025] The left end of the pipeline mixer 1 is provided with a first input terminal that connects to the output terminal of the first emergency shut-off valve 6, the upper end is provided with a second input terminal that connects to the output terminal of the hydrogen blending ratio adapter interface 12 on the hydrogen side, and the right end is provided with an output terminal that connects to the hydrogen blending ratio adapter interface 14 on the mixing output side.

[0026] Three sets of spiral guide vanes 13 are evenly distributed along the axial direction on the inner wall of the pipeline mixer 1. The vanes are inclined at a 35° angle to the pipeline axis. The spiral directions of adjacent vanes are alternately arranged. The vanes are fixed to the inner wall of the pipeline mixer 1 by welding to ensure that the vanes are not deformed under the impact of airflow. When natural gas is input from the left end and hydrogen is input from the top end, the vanes can form a multi-stage rotating shear flow to fully mix the two gases.

[0027] The hydrogen blending ratio adapter interface 14 on the hybrid output side is connected in series between the output end of the pipeline mixer 1 and the inlet pipeline of the gas turbine pre-module. The hydrogen blending ratio adapter interface 14 on the hybrid output side includes two sets of switchable sealing components: one set is a conventional 304 stainless steel gasket adapted for 5% volume ratio hydrogen blending, and the other set is a hydrogen-resistant brittle metal spiral wound gasket adapted for 35% volume ratio hydrogen blending. The flange specifications of the hydrogen blending ratio adapter interface 14 on the hybrid output side are fully matched with the flange of the inlet pipeline of the gas turbine pre-module, and can be connected without modifying the gas turbine body.

[0028] The monitoring and control unit is used to achieve precise control of the hydrogen doping ratio and gas quality monitoring.

[0029] The DCS controller 15 is located in the central control room of the energy station and has data acquisition, logic control, and remote operation functions. The DCS controller 15 is electrically connected to the natural gas flow meter 4, the hydrogen flow meter 10, the first emergency shut-off valve 6, the second emergency shut-off valve 11, and the chromatograph 16 via shielded cables. It can display parameters such as pressure, flow rate, and valve status of each component in real time. The DCS controller 15 has a built-in proportional control module, which can control the hydrogen input by adjusting the opening of the flow control valve downstream of the hydrogen flow meter 10 based on the real-time flow signal of the natural gas flow meter 4, forming a single closed-loop proportional control loop to reduce the deviation of the hydrogen blending ratio.

[0030] The chromatograph 16 has the function of detecting components such as hydrogen, methane, and ethane. The chromatograph 16 is inserted into the pipeline downstream of the hydrogen blending ratio adapter interface 14 on the mixing output side through a threaded sealing connection. A 0.2μm filter is provided at the front end of the sampling probe to prevent impurities from entering the chromatograph 16. The detection signal of the chromatograph 16 is transmitted to the DCS controller 15 to ensure real-time monitoring of the hydrogen-blended natural gas components.

[0031] The device also includes a safety protection unit; the safety protection unit includes combustible gas detectors and lightning protection and anti-static grounding electrodes; the combustible gas detectors are respectively located near the hydrogen unloading column 7, the hydrogen pressure regulating skid 9, and the pipeline mixer 1, and are electrically connected to the DCS controller 15; the lightning protection and anti-static grounding electrodes are respectively connected to the outer shells of the hydrogen unloading column 7, the hydrogen pressure regulating skid 9, and the pipeline mixer 1 via metal connectors. A total of four combustible gas detectors are installed, respectively located 1m to the left of the hydrogen unloading column, 0.5m to the right of the hydrogen pressure regulating skid 9, below the pipeline mixer 1, and below the downstream pipeline of the hydrogen blending ratio adapter interface 12 on the mixing output side. The pipeline material of the natural gas transmission unit is 20 steel, and the output pressure of the natural gas pressure regulator 5 is stable at 3.7MPa; the first emergency shut-off valve 6 and the second emergency shut-off valve 11 are both pneumatic ball valves, controlled by the instrument air pipeline, with a response time of no more than 1s.

[0032] Operating procedure of this device The first-phase 5% hydrogen-doped static mixing unit operation process is as follows: Natural gas enters from the pipeline network through natural gas intake interface 2, and sequentially passes through natural gas filter 3 to filter impurities, natural gas flow meter 4 to measure, and natural gas pressure regulator 5 to reduce pressure to 3.7 MPa. It is then delivered to the first input end of the left side of pipeline mixer 1 through the first emergency shut-off valve 6. Hydrogen from the long-tube trailer is unloaded through hydrogen unloading column 7, and sequentially passes through hydrogen filter 8, hydrogen pressure regulator skid 9 to reduce pressure to 3.95 MPa, hydrogen flow meter 10 to measure, and second emergency shut-off valve 11 to cut off pressure. It is then delivered to the second input end of the upper side of pipeline mixer 1 through hydrogen side blending ratio adapter interface 12. Gas and hydrogen are mixed in the pipeline mixer 1 by three sets of alternating spiral guide vanes 13 to form a rotating shear flow. After being mixed evenly, the mixture is delivered to the gas turbine pre-module through the hydrogen blending ratio adapter interface 14 on the mixing output side. The DCS controller 15 controls the opening of the hydrogen flow regulating valve through the proportional adjustment module based on the flow signal from the natural gas flow meter 4 to ensure that the hydrogen blending ratio is stable at 5%. The chromatograph 16 detects the components of the mixed gas in real time and feeds the data back to the DCS controller 15. If the ratio deviation exceeds the limit, the controller 15 can trigger the first emergency shut-off valve 6 and the second emergency shut-off valve 11 to close simultaneously to ensure system safety.

[0033] When the second phase of the project requires increasing the hydrogen blending ratio to 35%, only three operations need to be completed: First, replace the DN25 component of the hydrogen blending ratio adapter interface 12 on the hydrogen side with a DN50 component; second, replace the hydrogen flow meter 10 with a 0-3000Nm meter. 3 / h range model; third, replace the conventional metal gasket of the hydrogen doping ratio adapter interface 14 on the mixed output side with a hydrogen-resistant embrittlement metal spiral wound gasket, shorten the overall modification time, do not require modification of other core components, and greatly reduce modification costs and downtime losses.

[0034] The hydrogen delivery unit of this application is equipped with a nitrogen interface. Its working principle is based on the isolation and replacement characteristics of inert gases. The core is to ensure the safe operation of the hydrogen delivery system through the introduction of nitrogen.

[0035] Before system startup or during maintenance, open nitrogen port 19 and introduce high-purity nitrogen into the hydrogen delivery pipeline to purge the hydrogen pipeline. The fluidity of nitrogen will gradually remove any residual air or hydrogen from the pipeline. When used for pre-startup purging, the oxygen content in the pipeline must be reduced to below 0.5% to prevent the formation of an explosive mixture when hydrogen is subsequently introduced. When used for pre-maintenance purging, the hydrogen concentration must be reduced to below 0.4% to ensure safe maintenance operations.

[0036] If a hydrogen leak or excessive concentration is detected in the pipeline, nitrogen is quickly introduced through nitrogen inlet 19 to purge and dilute the local hydrogen concentration below the lower explosive limit. Simultaneously, the second emergency shut-off valve 11 closes the hydrogen flow path to prevent further risk. The entire process can be automated by controlling the nitrogen supply and flow rate through the DCS controller 15.

[0037] This invention utilizes two sets of hydrogen blending ratio adaptation interfaces on the hydrogen side and the mixing output side. Without requiring overall equipment modification, only the interface components need to be replaced to achieve a smooth transition from the 5% volume ratio hydrogen blending requirement in Phase I to the 35% volume ratio requirement in Phase II. This shortens the replacement time of a single component and the downtime period for Phase II modifications, reducing modification costs and adapting to phased project construction plans. The pipeline mixer incorporates alternating spiral guide vanes, using rotating shear flow to break up the density stratification of natural gas and hydrogen, ensuring thorough and uniform mixing and stable output mixed gas pressure. This meets the gas turbine's requirements for fuel consistency, effectively avoiding combustion fluctuations, reducing NOx emissions, and improving gas turbine combustion efficiency and environmental protection. Performance: The monitoring and control unit is based on a DCS controller. It uses a single closed-loop proportional regulation loop that synchronously monitors natural gas and hydrogen flow rates. Combined with real-time detection by a chromatograph, it reduces the deviation of the hydrogen blending ratio, remotely monitors key parameters, and realizes remote valve control, reducing on-site maintenance workload and improving operational convenience and control accuracy. It forms a multi-layer protection system through dual emergency shut-off valves, combustible gas detection, lightning protection and anti-static grounding, and nitrogen interface. It removes explosive mixtures through nitrogen replacement, prevents hydrogen leakage through nitrogen sealing during operation, and quickly controls the risk in case of leakage by linkage shut-off valve and nitrogen purging. It fully meets safety requirements and ensures long-term stable operation of the system.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A hydrogen-doped static mixing device, characterized in that: The system includes a natural gas delivery unit, a hydrogen delivery unit, a pipeline mixer, and a monitoring and control unit. The natural gas delivery unit comprises a natural gas intake port, a natural gas filter, a natural gas flow meter, a natural gas pressure regulator, and a first emergency shut-off valve, connected in series. The output of the first emergency shut-off valve is sealed to the first input of the pipeline mixer. The hydrogen delivery unit comprises a hydrogen unloading column, a hydrogen filter, a hydrogen pressure regulating skid, a hydrogen flow meter, and a second emergency shut-off valve, connected in series. A hydrogen-side blending ratio adapter interface is connected in series between the output of the second emergency shut-off valve and the second input of the pipeline mixer. The pipeline... Multiple sets of spiral guide vanes are evenly distributed along the axial direction on the inner wall of the mixer; the output end of the pipeline mixer is connected in series with a hydrogen blending ratio adapter interface on the mixing output side, and the output end of the hydrogen blending ratio adapter interface on the mixing output side is used to connect to the inlet pipeline of the gas turbine pre-module; the monitoring and control unit includes a DCS controller and a chromatograph, the sampling probe of the chromatograph is sealed to the pipeline downstream of the hydrogen blending ratio adapter interface on the mixing output side, and the proportional adjustment module in the DCS controller is electrically connected to the natural gas flow meter and the hydrogen flow meter respectively, and the proportional adjustment module is used to adjust the hydrogen input according to the flow signal of the natural gas flow meter.

2. The hydrogen-doped static mixing device according to claim 1, characterized in that, The hydrogen-side hydrogen doping ratio adaptation interface includes two sets of switchable interface components, namely a DN25 component adapted for 5% volume ratio hydrogen doping and a DN50 component adapted for 35% volume ratio hydrogen doping.

3. The hydrogen-doped static mixing device according to claim 1, characterized in that, The hybrid output side hydrogen doping ratio adapter interface includes two sets of switchable sealing components. The two sets of sealing components are a conventional metal gasket adapted to 5% volume ratio hydrogen doping and a hydrogen-resistant spiral wound gasket adapted to 35% volume ratio hydrogen doping.

4. The hydrogen-doped static mixing device according to claim 1, characterized in that, The hydrogen pressure regulating skid includes two parallel pressure regulators, a safety valve, and a pressure gauge. The input pressure range of the pressure regulator is 5-20 MPa, and the output pressure is stable at 3.95 MPa. The pipes and internal components of the hydrogen pressure regulating skid are made of 06Cr19Ni10 stainless steel, and the opening pressure of the safety valve is set to 4.0 MPa.

5. The hydrogen-doped static mixing device according to claim 1, characterized in that, Both the natural gas flow meter and the hydrogen flow meter are gas turbine flow meters with temperature and pressure compensation functions; the adapted pressure of the natural gas flow meter is 3.7 MPa, and the adapted pressure of the hydrogen flow meter is 3.95 MPa; the proportional control module forms a single closed-loop proportional control circuit by controlling the opening of the flow control valve downstream of the hydrogen flow meter.

6. The hydrogen-doped static mixing device according to claim 1, characterized in that, The first input end of the pipe mixer is located at its left end, the second input end is located at its upper end, and the output end is located at its right end; the pipe mixer is made of stainless steel.

7. The hydrogen-doped static mixing device according to claim 1, characterized in that, The outlet pipe of the hydrogen unloading column branches into a process conveying path and a safety venting path; the process conveying path is connected to the input end of the hydrogen filter, and the safety venting path is extended to the vent outlet after being equipped with a flame arrester in series; the flame arrester is located near the vent outlet and is welded to the pipe of the safety venting path.

8. The hydrogen-doped static mixing device according to claim 1, characterized in that, It also includes a safety protection unit; the safety protection unit includes a combustible gas detector and a lightning protection and anti-static grounding electrode; the combustible gas detector is respectively located near the hydrogen unloading column, the hydrogen pressure regulating skid and the pipeline mixer, and is electrically connected to the DCS controller; the lightning protection and anti-static grounding electrode is connected to the outer shell of the hydrogen unloading column, the hydrogen pressure regulating skid and the pipeline mixer respectively through metal connectors.

9. The hydrogen-doped static mixing device according to claim 8, characterized in that, A total of four combustible gas detectors are installed, located 1m to the left of the hydrogen unloading column, 0.5m to the right of the hydrogen pressure regulating skid, below the pipeline mixer, and below the downstream pipeline of the hydrogen doping ratio adapter interface on the mixing output side.

10. The hydrogen-doped static mixing device according to claim 1, characterized in that, The pipeline of the natural gas transmission unit is made of 20 steel, and the output pressure of the natural gas pressure regulator is stable at 3.7MPa; the first emergency shut-off valve and the second emergency shut-off valve are both pneumatic ball valves, controlled by the instrument air pipeline, with a response time of no more than 1s.

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