Dynamic mixer for mixing hydrogen and natural gas

Abstract

The invention relates to the technical field of dynamic mixers, and discloses a dynamic mixer for mixing hydrogen and natural gas, the dynamic mixer comprises a mixing tank I and a main mixing mechanism, the mixing tank I is internally provided with a pre-mixing mechanism for preliminarily mixing hydrogen and natural gas, and the pre-mixing mechanism comprises a mounting cover and a driving assembly; the bottom of the mounting cover is fixedly connected to the inner bottom wall of the first mixing tank, a first air inlet pipe and a second air inlet pipe are fixedly connected to the outer wall of the mounting cover, and one end of the first air inlet pipe and one end of the second air inlet pipe penetrate through the outer wall of the first mixing tank and extend to the outside. In the premixing stage, the impeller rotates to generate negative pressure, so that gas is subjected to shearing, collision and vortex in the rising process, the gas is divided into multiple strands through the gas guide holes in the special inclined plane column to be interwoven and collided with one another in the main mixing stage, the mixing uniformity is further improved, and the mixing quality and efficiency of hydrogen and natural gas are greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of dynamic mixers, in particular to a dynamic mixer used for hydrogen and natural gas blending. Background Art

[0002] As the world strives to reduce carbon emissions and promote the application of clean energy, blending hydrogen into natural gas to form hydrogen-blended natural gas and transporting it using existing natural gas pipelines or networks has become an important way to achieve large-scale, safe and efficient transportation of hydrogen, and a key step towards climate-neutral energy supply. Typical downstream terminal application scenarios of this mixed gas, such as hydrogen energy communities and hydrogen energy industrial parks, mainly use thermal energy through combustion. In order to ensure the stability of combustion and the safety of gas use, before hydrogen is mixed into the natural gas pipeline or network, it is necessary to evenly mix hydrogen and natural gas in a mixing device at a set ratio. Therefore, a dynamic mixer for hydrogen and natural gas blending came into being, and its role is crucial.

[0003] The dynamic mixers used for hydrogen and natural gas blending in the prior art usually contain moving parts such as rotating blades and spiral structures. During the gas flow process, these moving parts create a complex flow field through mechanical movement, which promotes the diffusion and mixing of hydrogen and natural gas molecules. Some mixers are also equipped with multiple sensors to monitor gas flow, concentration and other parameters, and rely on controllers to accurately control the operation of each component. At the same time, high-quality seals are used to prevent gas leakage, and wear-resistant materials are used to deal with the wear of components under high-speed operation and gas scouring, so as to ensure the mixing accuracy and stable operation of the equipment.

[0004] However, there are still many problems with the prior art. In some industrial production scenarios, such as when large gas turbines use hydrogen-blended natural gas as fuel, extremely high mixing uniformity requirements are imposed. However, existing dynamic mixers are difficult to achieve sufficient mixing due to structural design limitations. The internal flow field of some mixers is single, and short circuits or stagnation areas are prone to occur in the gas during the mixing process. In particular, the density difference between hydrogen and natural gas is large, resulting in uneven mixing, which is difficult to meet production needs. Therefore, the present invention provides a dynamic mixer for hydrogen and natural gas blending to address the shortcomings of the prior art. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a dynamic mixer for hydrogen and natural gas blending, which solves the problem that the dynamic mixer in the prior art is difficult to fully mix hydrogen and natural gas.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a dynamic mixer for hydrogen and natural gas blending, comprising a mixing tank 1 and a main mixing mechanism, the interior of the mixing tank 1 is provided with a premixing mechanism for preliminary mixing of hydrogen and natural gas, the premixing mechanism comprises a mounting cover and a driving assembly, the bottom of the mounting cover is fixedly connected to the inner bottom wall of the mixing tank 1, the outer wall of the mounting cover is respectively fixedly connected with an intake pipe 1 and an intake pipe 2, one end of the intake pipe 1 and the intake pipe 2 both penetrate the outer wall of the mixing tank 1 and extend to the outside, the inner wall of the mixing tank 1 is installed with a sensor group, and a pressure relief valve is provided at the through hole on the inner wall of the mixing tank 1.

[0007] Preferably, the driving assembly includes a reduction motor 1, which is installed at the bottom of a mixing tank 1. An explosion-proof shell 1 is provided on the outside of the reduction motor 1, and the top of the explosion-proof shell 1 is fixedly connected to the bottom of the mixing tank 1.

[0008] Preferably, the output end of the reduction motor 1 is fixedly connected to a rotating rod 1, the outside of the rotating rod 1 is fixedly connected to two impellers 1, and the impellers 1 are located inside the mounting cover.

[0009] Preferably, the inner bottom wall of the mixing tank is fixedly connected with a conical cover 1, and the conical cover 1 is located inside the mounting cover. Two groups of air return holes are opened on the outer side of the mounting cover, and the number of the air return holes in each group is multiple. The two groups of air return holes are symmetrically arranged, and the top of the mixing tank is fixedly connected with a conical cover 2.

[0010] Preferably, the outer side of the rotating rod 1 is rotatably connected to the inner side of the conical cover 1, and the top end of the rotating rod 1 is rotatably connected to the inner side of the conical cover 2.

[0011] Preferably, the main mixing mechanism includes mixing tank two, which is located on the top of mixing tank one, and the outer sides of mixing tank two are respectively fixedly connected with transition pipe one and transition pipe two, and the adjacent ends of transition pipe one and transition pipe two are fixedly connected to the outer side of mixing tank one.

[0012] Preferably, both ends of the outside of the second mixing tank are fixedly connected to a second explosion-proof shell, and a second reduction motor is installed inside the second explosion-proof shell. The output end of the second reduction motor is fixedly connected to a second rotating rod, and one end of the second rotating rod passes through the inner wall of the second mixing tank and extends into the interior thereof. One end of the second rotating rod is fixedly connected to a second impeller, and the second impeller is located inside the second mixing tank.

[0013] Preferably, two positioning rings are fixedly connected to the inner wall of the second mixing tank, a bevel column is fixedly connected to the inner side of the positioning ring, a plurality of air guide holes are opened inside the bevel column, and an air outlet pipe is arranged on the outer side of the second mixing tank.

[0014] The present invention provides a dynamic mixer for hydrogen and natural gas blending, which has the following beneficial effects: 1. The present invention realizes multi-stage and multi-mode gas mixing through the coordinated cooperation between structures. In the pre-mixing stage, the rotation of the impeller is used to generate negative pressure, so that the gas undergoes shearing, collision and vortex during the rising process, increasing the molecular contact area and initially promoting mixing. In the main mixing stage, the impeller guides the gas to flow toward the center, and the gas is divided into multiple strands through the air guide holes in the special inclined column. The gas is intertwined and collided with each other, further improving the mixing uniformity, thereby greatly improving the mixing quality and efficiency of hydrogen and natural gas.

[0015] 2. The present invention is equipped with comprehensive safety protection facilities. The sensor group installed on the inner wall of the mixing tank can monitor the temperature and pressure data in real time. Once the pressure in the mixing tank exceeds the safe range, the pressure relief valve will automatically open to release the pressure, effectively avoiding the safety hazards caused by excessive pressure. In addition, the explosion-proof shell design on the outside of the motor can prevent hydrogen leakage from causing explosions, ensuring the safety and reliability of the mixing process in all aspects, and providing solid protection for the stable operation of the equipment and the safety of personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A perspective view of the present invention; Figure 2 It is a schematic diagram of the internal structure of the mixing tank 1 of the present invention; Figure 3 It is a schematic diagram of the internal structure of the mounting cover of the present invention; Figure 4 It is a schematic diagram of the internal structure of the mixing tank 2 of the present invention.

[0017] Among them, 1. Mixing tank one; 2. Inlet pipe one; 3. Inlet pipe two; 4. Installation cover; 5. Explosion-proof shell one; 6. Reducer motor one; 7. Rotating rod one; 8. Impeller one; 9. Conical cover one; 10. Return air hole; 11. Conical cover two; 12. Transition pipe one; 13. Transition pipe two; 14. Mixing tank two; 15. Explosion-proof shell two; 16. Reducer motor two; 17. Rotating rod two; 18. Impeller two; 19. Positioning ring; 20. Inclined column; 21. Air guide hole; 22. Exit pipe; 23. Sensor group; 24. Pressure relief valve. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Please refer to the attached Figure 1 -Attached Figure 4The embodiment of the present invention provides a dynamic mixer for hydrogen and natural gas blending, including a mixing tank 1 and a main mixing mechanism. The interior of the mixing tank 1 is provided with a pre-mixing mechanism for preliminary mixing of hydrogen and natural gas, and the pre-mixing mechanism plays a vital basic role in the entire mixing process. The pre-mixing mechanism includes a mounting cover 4 and a driving assembly. The bottom of the mounting cover 4 is firmly fixedly connected to the inner bottom wall of the mixing tank 1, and the outer wall thereof is respectively fixedly connected with an intake pipe 1 and an intake pipe 2 3. One end of the intake pipe 1 2 and the intake pipe 2 3 both accurately penetrate the outer wall of the mixing tank 1 and extend to the outside, and one end thereof is respectively used to connect an external hydrogen storage container and a natural gas storage container, and the intake pipe 1 2 and Solenoid valves are installed inside the air inlet pipe 23. These solenoid valves accurately control the timing and flow rate of gas inflow, ensuring that hydrogen and natural gas can enter the mixer according to the preset ratio, laying the foundation for subsequent efficient mixing. A sensor group 23 is installed on the inner wall of the mixing tank 1. The sensor group 23 includes a variety of temperature and pressure detection sensors. These sensors monitor the temperature and pressure data inside the mixing tank 1. Once the internal pressure of the mixing tank 1 is too high and exceeds the preset safety threshold, the pressure relief valve 24 installed at the through hole on the inner wall of the mixing tank 1 will automatically open and quickly release the excess pressure, thereby ensuring the safety of the mixing process and preventing dangerous situations such as tank rupture caused by excessive pressure. The driving component includes a reduction motor 6, which is installed at the bottom of the mixing tank 1, and an explosion-proof shell 5 is installed on the outside, and the top of the explosion-proof shell 5 is fixedly connected to the bottom of the mixing tank 1.Due to the flammable and explosive nature of hydrogen, the setting of the explosion-proof shell 5 is extremely critical. It can effectively prevent the explosion hazard caused by hydrogen leakage and provide protection for the safe operation of the entire mixer. After the reduction motor 6 is started, its output end drives the rotating rod 7 to rotate at a high speed, thereby making the two impellers 8 fixed on the outside of the rotating rod 7 rotate synchronously. When the impeller 8 rotates, negative pressure will be generated in the installation cover 4. The negative pressure attracts the gas to move upward. During the rising process, the gas first contacts the impeller 8 at the bottom. The blades of the impeller 8 rotate rapidly, generating a strong shear force on the gas, cutting the gas stream into tiny air masses, greatly increasing the contact area between hydrogen and natural gas, and promoting the initial mixing of the two. Then, the gas mixed by the bottom impeller 8 is It will be guided by the impeller 8 on the upper layer and directly collide with the conical cover 11. The special conical structure of the conical cover 11 will cause the gas to change its movement direction after the collision and form a vortex, thereby further enhancing the mixing degree of the gas. In this process, part of the gas will fall from the gap between the mixing tank 1 and the mounting cover 4 due to the centrifugal force generated by the rotation of the impeller 8 and its own gravity, and then enter the interior of the mounting cover 4 again through the return air holes 10 opened on the outside of the mounting cover 4. Each group of return air holes 10 is numerous, and the two groups of return air holes 10 are symmetrically arranged. This design ensures the uniformity of the gas return path. The gas is sheared, collided, vortexed and mixed in the mounting cover 4 in this reciprocating manner. After multiple cycles, the initial mixing effect is guaranteed.The conical cover 9 fixedly connected to the inner bottom wall of the mixing tank 1 is located inside the mounting cover 4, and it works in coordination with the impeller 8. When the gas is guided upward by the impeller 8, the conical cover 9 can change the movement trajectory of the gas, making the movement path of the gas in the mounting cover 4 more complicated, thereby enhancing the mixing effect. The outer side of the rotating rod 7 and the inner side of the conical cover 9 are rotationally connected through a high-precision rotation connection structure, and the top end of the rotating rod 7 is also precisely rotationally connected to the inner side of the conical cover 2 11, which ensures the stability of the rotating rod 7 during high-speed rotation, avoids the impeller 8 from colliding with other components due to shaking, and also ensures the continuous stability of the gas mixing process. The main mixing mechanism includes a mixing tank 2 14, which is located at the top of the mixing tank 1, and is connected to the mixing tank 1 through a transition pipe 12 and a transition pipe 2 13. The adjacent ends of the transition pipe 12 and the transition pipe 2 13 are fixedly connected to the outer side of the mixing tank 1, and valves are provided in the transition pipe 12 and the transition pipe 2 13. Channel, when the premixed gas reaches a certain mixing degree and flow requirement, the valve channels in the transition pipe 12 and the transition pipe 2 13 are opened, and the premixed gas will smoothly enter the mixing tank 2 14 under the action of the pressure difference. The outer ends of the mixing tank 2 14 are fixedly connected with explosion-proof shells 2 15. The reduction motor 2 16 installed inside the explosion-proof shell 2 15 is the power source for the main mixing stage. After the reduction motor 2 16 is started, the rotating rod 2 17 fixedly connected to its output end begins to rotate. One end of the rotating rod 2 17 penetrates the inner wall of the mixing tank 2 14 and extends to the inside thereof, driving the impeller 2 18 fixed at one end to rotate at a high speed. When the impeller 2 18 rotates, the gas entering the mixing tank 2 14 will be guided to the center position of the mixing tank 2 14. In the process of the gas flowing toward the center, it will pass through the inclined column 20 on the inner side of the positioning ring 19 fixed on the inner wall of the mixing tank 2 14. A plurality of air guide holes 21 are opened inside the inclined column 20. When the gas passes through these air guide holes 21, it will be divided into a plurality of small air flows. Multiple small air flows interweave and collide with each other in the mixing tank 14, further making the gas evenly mixed, greatly improving the mixing effect. The gas fully mixed in the main mixing stage is finally discharged from the outlet pipe 22 arranged outside the mixing tank 14 and transported to the subsequent use link.

[0020] Specifically, first, one end of the air intake pipe 1 2 and the air intake pipe 2 3 are used to connect the external hydrogen storage container and the natural gas storage container respectively. Solenoid valves are arranged inside the air intake pipe 1 2 and the air intake pipe 2 3, and these solenoid valves play an important role in accurately regulating the gas flow and the timing of air intake. Through a pre-set control program, the solenoid valve can accurately control the hydrogen and natural gas to flow into the mixer in a specific proportion according to the mixing requirements. This precise proportion control is extremely critical to achieving a uniform and efficient mixing effect, because the mixing of hydrogen and natural gas in different proportions will have a significant impact on the subsequent performance. For example, in combustion applications, a suitable mixing ratio can ensure more complete and stable combustion and improve energy utilization efficiency. When the two gases enter the interior of the mounting cover 4 through the air intake pipe 1 2 and the air intake pipe 2 3, the key link of premixing is opened. At this time, the reduction motor 1 6 is started, and the reduction motor 1 6 drives the rotating rod 1 7 to rotate at high speed through a rigid connection with the rotating rod 1 7. The high-speed rotation of the rotating rod 7 drives the two impellers 8 fixed on the outside to rotate synchronously. During the high-speed rotation of the impeller 8, its blades quickly cut the air, and an obvious negative pressure environment will be produced in the mounting cover 4. This negative pressure environment is like a powerful suction source, which can effectively attract the gas to move upward. During the rising process, the gas first contacts the bottom impeller 8. The blades of the impeller 8 are specially designed, and when rotating at high speed, they will produce a strong shear force on the gas. This shear force can cut the gas stream into extremely small air masses, greatly increasing the contact area between hydrogen and natural gas molecules. The increase in the molecular contact area allows the two gas molecules to diffuse and blend more fully with each other, thereby effectively promoting the initial mixing of the two. The gas that has been initially mixed by the bottom impeller 8 will then be guided by the upper impeller 8 and directly collide with the conical cover 11. The unique conical structure of the conical cover 11 causes the gas to change its direction of movement after the collision, forming a vortex motion around the surface of the conical cover 11. The vortex motion can further enhance the mixing degree of the gas, because during the vortex process, the gas in different areas is forced to mix, making the distribution of the gas more uniform, further breaking the possible local concentration unevenness. In this process, part of the gas will fall from the gap between the mixing tank 1 and the installation cover 4 due to the centrifugal force generated by the rotation of the impeller 8 and its own gravity. The return air hole 10 opened on the outside of the installation cover 4 plays an important role at this time, and the falling gas enters the interior of the installation cover 4 again through the return air hole 10. Each group of return air holes 10 is numerous, and the two groups of return air holes 10 are symmetrically arranged, which ensures the uniformity of the gas return path and avoids the situation of local gas circulation being blocked. The gas is sheared, collided, and vortexed in the installation cover 4 in this way, and each cycle further improves the uniformity of the mixing. After many cycles, hydrogen and natural gas are initially evenly mixed in the installation cover 4, laying a good foundation for the subsequent main mixing stage.When multiple cycles of mixing are completed in the installation cover 4 and a certain premixing effect is achieved, it is necessary to open the valve channels in the transition pipe 12 and the transition pipe 2 13. The opening of these two valve channels allows the premixed gas to smoothly enter the mixing tank 2 14 from the mixing tank 1 under the action of the pressure difference. The pressure difference is the power source of the gas flow. By reasonably designing the internal pressure environment of the mixing tank 1 and the mixing tank 2 14, it can ensure that the gas flows smoothly and continuously into the next mixing stage. At this time, start the two reduction motors 2 16, which are respectively fixedly connected to the rotating rod 2 17, thereby driving the rotating rod 2 17 to rotate. The rotation of the rotating rod 2 17 drives the impeller 2 18 fixed at one end thereof to rotate at a high speed. When the impeller 2 18 rotates, it will guide the gas entering the mixing tank 2 14 to the center position of the mixing tank 2 14. In the process of the gas flowing to the center, it will pass through the inclined column 20 on the inner side of the positioning ring 19 fixed to the inner wall of the mixing tank 2 14. A plurality of air guide holes 21 are provided inside the inclined column 20. When the gas passes through these air guide holes 21, it will be divided into a plurality of fine air flows. The plurality of fine air flows interweave and collide with each other in the mixing tank 14, further enabling the gas to be evenly mixed. This interaction of multiple air flows greatly increases the probability of collision between gas molecules, so that the gas that was initially mixed in the premixing stage can achieve a more uniform mixing effect in the main mixing stage, greatly improving the quality of the mixing. The gas that is fully mixed in the main mixing stage is finally discharged from the outlet pipe 22 arranged outside the mixing tank 14 and transported to the subsequent use link. During the entire mixing process, the sensor group 23 installed on the inner wall of the mixing tank 1 plays a vital role in safety protection. The sensor group 23 includes a variety of sensors for temperature and pressure detection, which monitor the temperature and pressure data inside the mixing tank 1 in real time. When the pressure inside the mixing tank 1 is too high, the pressure relief valve 24 will be opened to relieve the pressure to ensure the safety of mixing. Because during the mixing process, the flow of gas, the stirring of the impeller and other operations may cause the pressure inside the tank to increase. If the pressure is too high and exceeds the bearing limit of the tank body, it will cause safety risks. When the pressure reaches a preset danger threshold, the pressure relief valve 24 can open automatically and quickly to release the excess pressure in the tank, ensuring that the mixing tank 1 always operates within a safe pressure range, thereby ensuring the safety and reliability of the entire mixing process.

[0021] Working principle: First, one end of the air inlet pipe 2 and the air inlet pipe 23 are used to connect the external hydrogen storage container and the natural gas storage container respectively. Solenoid valves are set inside the air inlet pipe 2 and the air inlet pipe 23. After the two gases enter the interior of the installation cover 4, the reduction motor 6 is started to drive the rotating rod 7 to rotate, so that the two impellers 8 rotate, so that negative pressure can be generated to attract the gas to move upward. When the gas contacts the bottom impeller 8, it will be sheared and mixed, and then guided by the upper impeller 8 to collide with the conical cover 211, so that the gas forms a vortex. Part of the gas will fall from the gap between the mixing tank 1 and the installation cover 4, and then enter the interior of the installation cover 4 again through the return hole 10, and the mixing cycle will continue. After several cycles, the valve channels in the transition pipe 12 and the transition pipe 2 13 are opened to allow the pre-mixed gas to enter the mixing tank 2 14. At this time, the two reduction motors 2 16 are started to drive the rotating rod 2 17 to rotate, so that the impeller 2 18 guides the gas to the center of the mixing tank 2 14. The gas will be divided into multiple strands through the multiple air guide holes 21 inside the inclined column 20, so that the gas can be further evenly mixed, thereby improving the mixing effect. Finally, the mixed gas is discharged from the outlet pipe 22. The sensor group 23 includes a variety of sensors for temperature and pressure detection to ensure the mixing environment. When the internal pressure of the mixing tank 1 is too high, the pressure relief valve 24 is opened to relieve the pressure to ensure mixing safety.

[0022] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dynamic mixer for hydrogen and natural gas blending, comprising a mixing tank (1) and a main mixing mechanism, characterized in that: The mixing tank (1) is provided with a premixing mechanism for preliminary mixing of hydrogen and natural gas, the premixing mechanism comprising a mounting cover (4) and a driving assembly, the bottom of the mounting cover (4) being fixedly connected to the inner bottom wall of the mixing tank (1), the outer wall of the mounting cover (4) being fixedly connected to an intake pipe (2) and an intake pipe (3) respectively, one end of each of the intake pipes (2) and (3) passing through the outer wall of the mixing tank (1) and extending to the outside, the inner wall of the mixing tank (1) being provided with a sensor group (23), and the inner wall through hole of the mixing tank (1) being provided with a pressure relief valve (24).

2. The dynamic mixer for hydrogen and natural gas blending according to claim 1, characterized in that: The driving assembly comprises a reduction motor (6), the reduction motor (6) being mounted at the bottom of the mixing tank (1), an explosion-proof shell (5) being arranged outside the reduction motor (6), and the top of the explosion-proof shell (5) being fixedly connected to the bottom of the mixing tank (1).

3. The dynamic mixer for hydrogen and natural gas blending according to claim 2, characterized in that: The output end of the reduction motor 1 (6) is fixedly connected to a rotating rod 1 (7), and the outside of the rotating rod 1 (7) is fixedly connected to two impellers 1 (8), and the impellers 1 (8) are located inside the mounting cover (4).

4. The dynamic mixer for hydrogen and natural gas blending according to claim 3, characterized in that: The inner bottom wall of the mixing tank (1) is fixedly connected to a conical cover (9), the conical cover (9) is located inside the mounting cover (4), and two groups of air return holes (10) are opened on the outer side of the mounting cover (4), each group of the air return holes (10) has a plurality of air return holes (10), and the two groups of the air return holes (10) are symmetrically arranged, and the top of the mixing tank (1) is fixedly connected to a conical cover (11).

5. The dynamic mixer for hydrogen and natural gas blending according to claim 4, characterized in that: The outer side of the rotating rod 1 (7) is rotatably connected to the inner side of the conical cover 1 (9), and the top end of the rotating rod 1 (7) is rotatably connected to the inner side of the conical cover 2 (11).

6. The dynamic mixer for hydrogen and natural gas blending according to claim 1, characterized in that: The main mixing mechanism comprises a mixing tank 2 (14), wherein the mixing tank 2 (14) is located on the top of the mixing tank 1 (1), and the outer side of the mixing tank 2 (14) is fixedly connected to a transition pipe 1 (12) and a transition pipe 2 (13), respectively, and the adjacent ends of the transition pipe 1 (12) and the transition pipe 2 (13) are fixedly connected to the outer side of the mixing tank 1 (1).

7. The dynamic mixer for hydrogen and natural gas blending according to claim 6, characterized in that: Both ends of the outside of the second mixing tank (14) are fixedly connected to the second explosion-proof shell (15), and the inside of the second explosion-proof shell (15) is installed with a second reduction motor (16). The output end of the second reduction motor (16) is fixedly connected to a second rotating rod (17), and one end of the second rotating rod (17) passes through the inner wall of the second mixing tank (14) and extends into the inside thereof. One end of the second rotating rod (17) is fixedly connected to a second impeller (18), and the second impeller (18) is located inside the second mixing tank (14).

8. The dynamic mixer for hydrogen and natural gas blending according to claim 7, characterized in that: Two positioning rings (19) are fixedly connected to the inner wall of the second mixing tank (14); a sloped column (20) is fixedly connected to the inner side of the positioning ring (19); a plurality of air guide holes (21) are provided inside the sloped column (20); and an air outlet pipe (22) is provided on the outer side of the second mixing tank (14).

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