A natural gas hydrogen mixing device

Abstract

The present invention relates to the technical field of natural gas hydrogen blending, and in particular to a natural gas hydrogen blending mixing device, comprising a primary mixing tank, on which a natural gas inlet pipe and a hydrogen inlet pipe are respectively provided, an air guide hood is fixedly connected through the side wall of the primary mixing tank, a mixing frame is fixedly connected through the side wall of the air guide hood, an outlet pipe is fixedly connected through the side wall of the mixing frame, and a pair of top plates are fixedly connected to the top end of the mixing frame. The present invention adopts the arrangement of structures such as an electric telescopic cylinder, an upper plate and a lower plate, and monitors the concentration of hydrogen blended in natural gas in real time through a concentration sensor. When the concentration increases, the number of partitions in the mixing chamber can be adjusted in real time according to the concentration, thereby increasing the residence time of the gas in the mixing chamber, allowing the natural gas and hydrogen to have more time to diffuse and mix, thereby improving the uniformity of the mixed gas, helping to optimize the quality of the mixed gas, and ensuring stable combustion of downstream combustion equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of natural gas hydrogen blending, and in particular to a natural gas hydrogen blending device. Background Art

[0002] Natural gas hydrogen blending technology involves blending hydrogen into natural gas at a certain volume ratio to form hydrogen-blended natural gas (HCNG), which is then transported through existing natural gas pipelines. Since hydrogen has the characteristics of fast combustion speed, wide combustion margin, low specific calorific value, and long quenching length, blending hydrogen into natural gas can change the combustion characteristics of natural gas. Compared with burning natural gas alone, hydrogen-blended natural gas can effectively reduce carbon emissions and effectively protect the environment.

[0003] In the prior art, a fuel gas hydrogen blending device with publication number CN218452111U is disclosed. The impact force of the airflow of hydrogen and natural gas entering the tank shell drives the rotating blades to rotate, thereby driving the third bevel gear to rotate through the transmission device, and the third bevel gear drives the fourth bevel gear and the rotating shaft to rotate, thereby driving the second bevel gear and the connecting rod to rotate through the first bevel gear, thereby driving the driven blades to rotate at the intersection of hydrogen and natural gas, driving the airflow, mixing the natural gas and hydrogen, and thus improving the mixing effect of the natural gas and hydrogen.

[0004] Although the above-mentioned device can improve the mixing effect of natural gas and hydrogen, it still has some defects during actual use. Since the mixing time of the device is fixed, when mixing hydrogen and natural gas of different concentrations, the composition and proportion of the mixed gas cannot be accurately controlled, thereby reducing the mixing effect and efficiency and reducing the energy utilization efficiency of the production process.

[0005] Therefore, a natural gas hydrogen mixing device is proposed to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to solve the shortcomings of the background technology and to propose a natural gas hydrogen mixing device.

[0007] In order to achieve the above purpose, the technical solution adopted by the present invention is as follows: a natural gas hydrogen mixing device, comprising a primary mixing tank, wherein the primary mixing tank is respectively provided with a natural gas inlet pipe and a hydrogen inlet pipe, the side wall of the primary mixing tank is fixedly connected with an air guide cover, the side wall of the air guide cover is fixedly connected with a mixing frame, the side wall of the mixing frame is fixedly connected with an outlet pipe, the top end of the mixing frame is fixedly connected with a pair of top plates, the bottom end of the mixing frame is fixedly connected with a bottom plate relative to the top plate, the side wall of the bottom plate is provided with a lower plate, and the lower plate is provided with a lower plate near the guide cover. An upper plate is provided next to the top plate on one side of the gas hood, a top groove is provided on the top of the mixing frame, a slider is fixedly connected to the top of the upper plate, a front groove is provided on the front side of the mixing frame, a front plate is provided in the front groove, the lower plate is fixedly connected to the rear side of the front plate, an inspection plate is connected to the front side of the mixing frame by bolts, a groove is provided on the front side of the mixing frame, an electric telescopic cylinder is fixedly connected to the inside of the groove, the output end of the electric telescopic cylinder is sealed and passed through the inside of the front groove and is fixedly connected to the side wall of the front plate, and a pulling mechanism for driving the upper plate to move is also provided.

[0008] In the above technical solution, further, the pulling mechanism includes a pull rope, a pulling cavity is opened at the top of the mixing frame, a slide is slidably connected in the pulling cavity, and a pair of pull ropes are provided, one end of the pull rope is fixedly connected to the side wall of the slider, and the other end of the pull rope is passed through the bottom end of the pulling cavity close to the lower plate and fixedly connected to the side wall of the slide, and the slide is fixedly connected to the rear side of the front plate.

[0009] In the above technical solution, further, a guide roller is rotatably connected to the inner side of the top groove at a corner relative to the pull rope, and the pull ropes all pass under the guide roller.

[0010] In the above technical solution, further, a plurality of springs are fixedly connected between the inner side of the top groove and the side wall of the slider, and a concentration monitor is fixedly connected to the inner side of the air guide cover.

[0011] In the above technical solution, further, a telescopic groove is provided at the bottom end of the upper plate, a telescopic plate is slidably connected to the inner side of the telescopic groove, a straight groove is provided on the inner side of the mixing frame, a downward inclined groove is provided at the side end of the straight groove, a round rod is fixedly connected to the rear side of the telescopic plate, and the round rod is inserted into the inner side of the straight groove.

[0012] In the above technical solution, further, a plurality of mixing holes are equidistantly opened on the side wall of the top plate next to the upper plate, and rubber blocks are fixedly connected to the side walls of the upper plate relative to the positions next to the plurality of mixing holes, and the side ends of the rubber blocks are set to be conical, and the rubber blocks are all inserted into the mixing holes.

[0013] In the above technical solution, further, a right-angle block with an inclined surface is fixedly connected to the bottom end of the side wall of the lower plate, an upper inclined opening is obliquely opened inside the right-angle block, a lower inclined opening is opened through the inside of the lower plate, and the inclination directions of the upper inclined opening and the lower inclined opening are arranged in opposite directions, the upper inclined opening is connected to the bottom end of the lower inclined opening, and the connection between the upper inclined opening and the lower inclined opening is arranged in an arc shape, and a guide block is fixedly connected to the bottom end of the mixing frame.

[0014] In the above technical solution, further, the inner side of the primary mixing tank is fixedly connected to a machine frame via a bracket at a position next to the air guide hood, a stirring fan is provided on the inner side of the machine frame, and a natural gas concentration sensor and a hydrogen concentration sensor are provided on the natural gas inlet pipe and the hydrogen inlet pipe respectively.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention utilizes an electric telescopic cylinder, upper and lower plates, and a concentration sensor to monitor the hydrogen concentration of natural gas in real time. When the concentration increases, the number of barriers in the mixing chamber can be adjusted in real time based on the concentration, thereby increasing the residence time of the gas in the mixing chamber. This allows the natural gas and hydrogen more time to diffuse and mix, thereby improving the uniformity of the mixed gas, optimizing the quality of the mixed gas, and ensuring stable combustion of downstream combustion equipment.

[0017] 2. The present invention can automatically open the mixing holes while increasing the number of baffles through the arrangement of the mixing holes and the rubber blocks, so that a portion of the gas entering from the primary mixing tank directly passes through the mixing holes on the top plate, thereby mixing with the gas flowing upward from below the top plate after being blocked by the lower plate, and then the gas can be cut, diverted and recombined, so that the gas continuously produces a shearing effect during the flow process, further improving the mixing uniformity of the gas. At the same time, through the design of the upper and lower oblique ports, a portion of the gas flowing from below the top plate can pass through the upper and lower oblique ports, and because the lower oblique port is inclined upward, it will have an impact deceleration effect on the subsequent gas passing between the lower plate and the upper plate, further increasing the mixing time of the gas in the mixing frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the front three-dimensional structure of the gas mixing device of the present invention;

[0019] Figure 2 This is a schematic diagram of the front full-section three-dimensional structure of the gas mixing device of the present invention;

[0020] Figure 3 The appended Figure 2 A schematic diagram of the partially enlarged structure at center A;

[0021] Figure 4 The appended Figure 2 A schematic diagram of the partially enlarged structure at point B in the middle;

[0022] Figure 5 This is a schematic diagram of the front three-dimensional structure of the gas mixing frame of the present invention when it is opened;

[0023] Figure 6 This is a schematic diagram of the three-dimensional structure of the gas mixing frame and the access panel separated from each other on the side of the present invention;

[0024] Figure 7 This is a schematic diagram of the overall appearance of the upper plate, lower plate and electric telescopic cylinder of the present invention;

[0025] Figure 8 This is a schematic diagram of a three-dimensional structure in which the upper plate and the top plate are separated according to the present invention;

[0026] Figure 9 Schematic diagram of the gas flow direction in the gas mixing frame of the present invention.

[0027] In the figure: 1. primary mixing tank; 2. natural gas inlet pipe; 3. hydrogen inlet pipe; 4. air guide hood; 5. mixing frame; 6. outlet pipe; 7. top plate; 8. bottom plate; 9. lower plate; 10. upper plate; 11. slide block; 12. front plate; 13. inspection panel; 14. electric telescopic cylinder; 15. pull rope; 16. slide plate; 17. pull chamber; 18. spring; 19. concentration monitor; 20. telescopic slot; 21. telescopic plate; 22. straight slot; 23. oblique slot; 24. round rod; 25. top slot; 26. front slot; 27. groove; 28. rubber block; 29. ​​right-angle block; 30. upper oblique opening; 31. lower oblique opening; 32. bracket; 33. machine frame; 34. stirring fan; 35. natural gas concentration sensor; 36. hydrogen concentration sensor; 37. guide roller; 38. mixing hole; 39. guide block. DETAILED DESCRIPTION

[0028] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] In actual use, it was found that since the mixing time of the existing gas mixing device is fixed, it is impossible to accurately control the composition and ratio of the mixed gas when mixing hydrogen and natural gas of different concentrations, thereby reducing the mixing effect and efficiency and the energy utilization efficiency of the production process. In order to solve the above problems, the following structure is specially invented.

[0031] like Figures 1-9The natural gas-hydrogen mixing device shown in the figure comprises a primary mixing tank 1, on which a natural gas inlet pipe 2 and a hydrogen inlet pipe 3 are respectively provided, an air guide hood 4 is fixedly connected to the side wall of the primary mixing tank 1, and the communication between the primary mixing tank 1 and the mixing frame 5 is facilitated by the air guide hood 4, a mixing frame 5 is fixedly connected to the side wall of the air guide hood 4, an outlet pipe 6 is fixedly connected to the side wall of the mixing frame 5, a pair of top plates 7 are fixedly connected to the top of the mixing frame 5, and a bottom plate 8 is fixedly connected to the position between the bottom end of the mixing frame 5 and the top plate 7. Through the arrangement of the top plate 7 and the bottom plate 8, the gas flow structure in the mixing frame 5 is S-shaped, which is convenient for preliminary flow resistance of the gas, and a lower plate 9 is provided on the side wall of the bottom plate 8, and a top plate 7 is provided near the side of the air guide hood 4. The upper plate 10, and the lower plate 9 and the upper plate 10 are not in use, and are placed next to the top plate 7 and the bottom plate 8, which will not affect the normal flow of gas. A top groove 25 is provided at the top of the mixing frame 5, and a slider 11 is fixedly connected to the top of the upper plate 10. A front groove 26 is provided on the front side of the mixing frame 5, and a front plate 12 is provided in the front groove 26. The lower plate 9 is fixedly connected to the rear side of the front plate 12. An access plate 13 is connected to the front side of the mixing frame 5 by bolts, and the access plate 13 is sealed and fixed to the mixing frame 5. A groove 27 is provided on the front side of the mixing frame 5, and an electric telescopic cylinder 14 is fixedly connected to the inside of the groove 27. The output end of the electric telescopic cylinder 14 is sealed and passed through the inside of the front groove 26 and is fixedly connected to the side wall of the front plate 12. A pulling mechanism for driving the upper plate 10 to move is also provided;

[0032] An organic frame 33 is fixedly connected to the inner side of the primary mixing tank 1 relative to the air guide hood 4 via a bracket 32. A stirring fan 34 is provided inside the machine frame 33. The stirring fan 34 can achieve a preliminary mixing effect on the natural gas and hydrogen, and can quickly guide the gas through the air guide hood 4 into the mixing frame 5. The natural gas inlet pipe 2 and the hydrogen inlet pipe 3 are respectively provided with a natural gas concentration sensor 35 and a hydrogen concentration sensor 36. The installation of the natural gas concentration sensor 35 and the hydrogen concentration sensor 36 can monitor the concentrations of the discharged natural gas and hydrogen in real time.

[0033] The pulling mechanism includes a pull rope 15. A pull cavity 17 is opened at the top of the mixing frame 5. A slide 16 is slidably connected to the pull cavity 17. A pair of pull ropes 15 are provided. One end of the pull rope 15 is fixedly connected to the side wall of the slider 11, and the other end of the pull rope 15 passes through the bottom end of the pull cavity 17 near the side of the lower plate 9 and is fixedly connected to the side wall of the slide 16. The slide 16 is fixedly connected to the rear side of the front plate 12.

[0034] A guide roller 37 is rotatably connected to the inner side of the top groove 25 at the corner relative to the pull rope 15. The pull rope 15 passes under the guide roller 37. The guide roller 37 can guide the sliding of the pull rope 15 and improve the smoothness of the pull rope 15 during the pulling process.

[0035] A plurality of springs 18 are fixedly connected between the inner side of the top groove 25 and the side wall of the slider 11. The setting of the springs 18 can quickly pull the upper plate 10 to reset when resetting. A concentration monitor 19 is fixedly connected to the inner side of the air guide cover 4. Through the cooperation of the concentration monitor 19, the natural gas concentration sensor 35 and the hydrogen concentration sensor 36, the mixed gas concentration can be detected and fed back more accurately.

[0036] A telescopic slot 20 is provided at the bottom end of the upper plate 10, and a telescopic plate 21 is slidably connected to the inner side of the telescopic slot 20. A straight slot 22 is provided on the inner side of the mixing frame 5, and a downwardly inclined oblique slot 23 is provided on the side end of the straight slot 22. A round rod 24 is fixedly connected to the rear side of the telescopic plate 21, and the round rod 24 is inserted into the inner side of the straight slot 22. Through the arrangement of the straight slot 22 and the oblique slot 23, the upper plate 10 and the lower plate 9 can be pulled to avoid being obstructed during the movement, and the telescopic plate 21 can be quickly moved downward after being staggered and pulled apart, thereby ensuring the subsequent flow blocking effect on the gas;

[0037] In the process of blending natural gas with hydrogen, the natural gas is first discharged into the primary mixing tank 1 through the natural gas inlet pipe 2, and a certain amount of hydrogen is discharged into the primary mixing tank 1 through the hydrogen inlet pipe 3. Then, under the action of the stirring fan 34, the hydrogen and natural gas are mixed and discharged into the mixing frame 5 so that the natural gas and hydrogen have more time to diffuse and mix. At the same time, under the obstruction of the top plate 7 and the bottom plate 8, the gas is made to flow in an S shape in the mixing frame 5, thereby increasing the mixing time.

[0038] Subsequently, when the concentration monitor 19, the natural gas concentration sensor 35, and the hydrogen concentration sensor 36 detect that the concentration has reached a preset level, a signal is transmitted to the controller, which controls the electric telescopic cylinder 14 to start and drive the front plate 12 to slide in the front groove 26, while driving the lower plate 9 to move. At the same time, the front plate 12 drives the two pull ropes 15 to move via the slide plate 16. Then, under the guidance of the guide roller 37, the pull ropes 15 pull the slider 11 to slide in the top groove 25, gradually stretching the spring 18.

[0039] At the same time, it drives the upper plate 10 to move and drives the round rod 24 to slide in the straight groove 22. Then, when the upper plate 10 passes the lower plate 9, the round rod 24 will slide out of the straight groove 22 and move to the inclined groove 23. Then, under the extrusion of the inclined surface of the inclined groove 23, the round rod 24 and the telescopic plate 21 will be squeezed to slide downward in the telescopic groove 20. Then, the round rod 24 moves to the lowest end of the inclined groove 23, and the telescopic plate 21 is fully extended. At the same time, the upper plate 10 and the lower plate 9 move to the specified position, and then two barriers are added between the top plate 7 and the bottom plate 8, which further block the passing gas. It should be noted here that the number of upper plates 10 and lower plates 9 can be set to multiple, and they can be connected to the front plate 12 in sequence without adding a driving part.

[0040] In summary, through the design of the above structure, when the concentration increases, the number of partitions in the mixing chamber can be adjusted in real time according to the concentration, thereby increasing the residence time of the gas in the mixing chamber, allowing natural gas and hydrogen more time to diffuse and mix, thereby improving the uniformity of the mixed gas, helping to optimize the quality of the mixed gas, and ensuring stable combustion of downstream combustion equipment.

[0041] Based on the above embodiment, it was found during use that although the gas mixing time in the mixing frame 5 could be adjusted in real time according to the concentration, the mixing effect between the gases could not be increased. In order to solve the above problem, the above structure was further improved.

[0042] A plurality of mixing holes 38 are equidistantly formed on the side wall of the top plate 7 located next to the upper plate 10. Rubber blocks 28 are fixedly connected to the side walls of the upper plate 10 at positions adjacent to the plurality of mixing holes 38. The side ends of the rubber blocks 28 are configured in a conical shape to facilitate insertion into the mixing holes 38 and ensure a sealing effect on the mixing holes 38. The rubber blocks 28 are all inserted into the mixing holes 38.

[0043] When the gas concentration increases and the upper plate 10 and the lower plate 9 are opened, the rubber block 28 on the upper plate 10 will be pulled out from the corresponding mixing hole 38, thereby releasing the blockage of the mixing hole 38. Subsequently, after the upper plate 10 and the lower plate 9 are moved into place, a part of the gas entering from the primary mixing tank 1 will directly pass through the mixing hole 38 on the top plate 7 and directly mix with the gas behind. The gas can then be cut, diverted and recombined, further improving the mixing effect.

[0044] In summary, through the design of the above structure, the number of barriers can be increased while the gas mixing holes 38 are automatically opened, so that a part of the gas entering from the primary mixing tank 1 directly passes through the gas mixing holes 38 on the top plate 7, thereby mixing with the gas flowing upward from the bottom of the top plate 7 after being blocked by the lower plate 9, and then the gas can be cut, diverted and recombined, so that the gas continuously produces a shear effect during the flow process, further improving the mixing uniformity of the gas.

[0045] Based on the above embodiments, it was found during use that a single enhanced mixing structure could not meet the high-concentration mixing requirements. To solve the above problem, the above structure was further improved.

[0046] The bottom end of the side wall of the lower plate 9 is fixedly connected to a right-angle block 29 with an inclined surface, and an upper oblique opening 30 is inclined inside the right-angle block 29. A lower oblique opening 31 is opened inside the lower plate 9, and the upper oblique opening 30 and the lower oblique opening 31 are arranged in opposite directions. The bottom ends of the upper oblique opening 30 and the lower oblique opening 31 are connected, and the connection between the upper oblique opening 30 and the lower oblique opening 31 is arranged in an arc shape. The bottom end of the mixing frame 5 is fixedly connected to a guide block 39. Through the setting of the guide block 39, a blocking effect can be played on the bottom of the right-angle block 29, so that the discharged gas is easily diverted upward and discharged quickly, thereby avoiding accumulation below the right-angle block 29 and improving the mixing efficiency of the device.

[0047] When the gas concentration increases, the electric telescopic cylinder 14 is controlled to start opening the upper plate 10 and the lower plate 9, which will release the blockage of the lower oblique opening 31, and the right-angle block 29 moves to the bottom of the top plate 7, so that part of the gas blocked by the top plate 7 from flowing downward (it should be noted here that the diameter of the upper oblique opening 30 is set to half the width of the lower plate 9, so that only a part of the gas will pass through the upper oblique opening 30 to avoid all of the gas passing through and affecting the gas mixing effect of the device) will enter through the upper oblique opening 30 and move out from the lower oblique opening 31 on the other side, further mixing with the passing gas to block the flow, thereby improving the gas mixing effect of the device.

[0048] To sum up, through the design of the above structure, and at the same time through the design of the upper oblique port 30 and the lower oblique port 31, a portion of the gas flowing from under the top plate 7 can pass through the upper oblique port 30 and the lower oblique port 31, and because the lower oblique port 31 is inclined upward, it will have an impact deceleration effect on the gas passing between the lower plate 9 and the upper plate 10 subsequently, further increasing the mixing time of the gas in the mixing frame 5.

[0049] The basic principles, main features and advantages of the present invention are shown and described above.

[0050] Those skilled in the art should understand that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments and the specification only describe the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. These changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A natural gas hydrogen mixing device, comprising a primary mixing tank (1), characterized in that: The primary mixing tank (1) is provided with a natural gas inlet pipe (2) and a hydrogen inlet pipe (3), respectively. An air guide hood (4) is fixedly connected to the side wall of the primary mixing tank (1), and a mixing frame (5) is fixedly connected to the side wall of the mixing frame (5). An outlet pipe (6) is fixedly connected to the side wall of the mixing frame (5). A pair of top plates (7) are fixedly connected to the top of the mixing frame (5), and a bottom plate (8) is fixedly connected to the bottom of the mixing frame (5) relative to the top plate (7). A lower plate (9) is provided on the side wall of the bottom plate (8), and an upper plate (10) is provided next to the top plate (7) on the side close to the air guide hood (4). A top groove is provided on the top of the mixing frame (5). (25), the top of the upper plate (10) is fixedly connected to a slider (11), the front side of the mixing frame (5) is provided with a front groove (26), the front plate (12) is provided in the front groove (26), the lower plate (9) is fixedly connected to the rear side of the front plate (12), the front side of the mixing frame (5) is connected to an inspection plate (13) by bolts, the front side of the mixing frame (5) is provided with a groove (27), the inner side of the groove (27) is fixedly connected to an electric telescopic cylinder (14), the output end of the electric telescopic cylinder (14) is sealed and passes through the inner side of the front groove (26) and is fixedly connected to the side wall of the front plate (12), and a pulling mechanism for driving the upper plate (10) to move is also provided; The pulling mechanism includes a pull rope (15), a pull cavity (17) is provided at the top end of the mixing frame (5), a slide plate (16) is slidably connected in the pull cavity (17), a pair of pull ropes (15) are provided, one end of the pull rope (15) is fixedly connected to the side wall of the slide plate (11), and the other end of the pull rope (15) is passed through the bottom end of the pull cavity (17) near the side of the lower plate (9) and fixedly connected to the side wall of the slide plate (16), and the slide plate (16) is fixedly connected to the rear side of the front plate (12); A guide roller (37) is rotatably connected to the inner side of the top groove (25) at a corner relative to the pull rope (15), and the pull rope (15) passes through the bottom of the guide roller (37); A plurality of springs (18) are fixedly connected between the inner side of the top groove (25) and the side wall of the slider (11), and a concentration monitor (19) is fixedly connected to the inner side of the air guide cover (4); A telescopic slot (20) is provided at the bottom end of the upper plate (10), a telescopic plate (21) is slidably connected to the inner side of the telescopic slot (20), a straight slot (22) is provided at the inner side of the mixing frame (5), a downwardly inclined inclined slot (23) is provided at the side end of the straight slot (22), a round rod (24) is fixedly connected to the rear side of the telescopic plate (21), and the round rod (24) is inserted into the inner side of the straight slot (22).

2. A natural gas hydrogen mixing device according to claim 1, characterized in that: A plurality of mixing holes (38) are equidistantly formed on the side wall of the top plate (7) located next to the upper plate (10). Rubber blocks (28) are fixedly connected to the side wall of the upper plate (10) at positions next to the plurality of mixing holes (38). The side ends of the rubber blocks (28) are configured to be conical, and the rubber blocks (28) are inserted into the mixing holes (38).

3. The natural gas hydrogen mixing device according to claim 1, characterized in that: A right-angle block (29) with an inclined surface is fixedly connected to the bottom end of the side wall of the lower plate (9), an upper inclined opening (30) is tiltedly opened inside the right-angle block (29), a lower inclined opening (31) is opened through the inside of the lower plate (9), and the upper inclined opening (30) and the lower inclined opening (31) are arranged in opposite inclination directions, the upper inclined opening (30) and the bottom end of the lower inclined opening (31) are connected, and the connection between the upper inclined opening (30) and the lower inclined opening (31) is arranged in an arc shape, and a guide block (39) is fixedly connected to the bottom end of the mixing frame (5).

4. The natural gas hydrogen mixing device according to claim 1, characterized in that: The inner side of the primary mixing tank (1) is fixedly connected to a frame (33) via a bracket (32) at a position next to the air guide cover (4). A stirring fan (34) is provided on the inner side of the frame (33). A natural gas concentration sensor (35) and a hydrogen concentration sensor (36) are provided on the natural gas inlet pipe (2) and the hydrogen inlet pipe (3), respectively.

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