Hydrogen alkali mist environment-friendly centrifugal separation device for hydrogen production

Abstract

The present application relates to hydrogen gas purification technology field, disclose a kind of hydrogen is used hydrogen alkali mist environmental centrifugal separation device, including acceleration shell, distribution pipe and multiple separation shells, acceleration leaf is sent into separation shell respectively with alkali mist hydrogen, inhalation leaf makes gas enter shrink tube, liquid drop converges along shrink tube inner wall to shrink port and then enters between extension pipe and transmission shaft, and by spiral blade is transported to first water outlet pipe, remaining gas is entered into centrifugal blade by reflux pipe, centrifugal blade is thrown to centrifugal shell with residual liquid drop, liquid-containing airflow flows along inlet pipe, reciprocating pipe and elbow pipe, liquid is discharged by second water outlet pipe, and purified hydrogen is discharged by gas outlet pipe.The present application realizes two-stage separation by shrink liquid collection, active liquid discharge and reflux centrifugation, which can reduce liquid drop back mixing and alkali mist entrainment.

Description

Technical Field

[0001] This invention relates to the field of hydrogen production gas purification technology, specifically to an environmentally friendly centrifugal separation device for hydrogen production containing alkaline mist that can sequentially perform shrinkage collection, active drainage, and reflux centrifugal separation on the alkaline mist hydrogen gas generated during the hydrogen production process. Background Technology

[0002] In the process of producing hydrogen by alkaline water electrolysis, the hydrogen gas discharged from the electrolyzer usually carries water vapor, alkaline droplets, and fine alkaline mist formed by gas flow shear. If these liquid components enter the subsequent pipelines with the hydrogen gas, it will not only reduce the purity of the hydrogen gas, but may also corrode valves, instruments and storage and transportation equipment. Therefore, it is necessary to install a gas-liquid separation device at the hydrogen output stage.

[0003] Existing gas-liquid separation devices often use sudden gas reversal, expansion of flow channel cross-section, or centrifugal force generated by swirling flow to separate droplets from gas. However, when hydrogen production equipment is running continuously, the hydrogen flow rate and alkaline mist content will change. A single inertial separation is difficult to simultaneously handle both large and small droplets. Liquid that has already adhered to the inner wall is also easily scoured and re-atomized by subsequent high-speed airflow.

[0004] When using a conventional cyclone structure, although droplets can be thrown toward the inner wall of the shell, if the liquid cannot leave the high-speed airflow area in time, the liquid film flowing along the wall may still be re-rolled up by the rotating airflow, forming secondary entrainment. Simply adding a filter layer will increase the gas flow resistance, and the filter layer needs to be stopped, disassembled, cleaned, or replaced after adsorbing alkaline solution.

[0005] In addition, when a single separation channel directly handles all the alkaline mist hydrogen, the gas flow rate in the channel is high and the processing load is concentrated. The processes of droplet aggregation, discharge and residual gas purification interfere with each other. If the separated liquid cannot be discharged in time, it will occupy the flow channel and increase the probability of back mixing, thus affecting the purification stability under continuous hydrogen production conditions.

[0006] Therefore, it is necessary to provide an environmentally friendly centrifugal separation device for hydrogen production using alkaline mist. First, the alkaline mist-containing hydrogen is distributed into multiple separation shells. Then, the liquid attached to the wall is gathered to a set position by a contraction tube and actively discharged through a spiral blade. Subsequently, the remaining gas is returned to the centrifugal blade for secondary centrifugal separation to reduce droplet backmixing and improve the continuous separation effect. Summary of the Invention

[0007] The purpose of this invention is to provide an environmentally friendly centrifugal separation device for hydrogen production using alkaline mist, in order to solve the problems of existing equipment where the separation process is concentrated in a single flow channel, the separated liquid cannot leave the high-speed airflow area in time, and residual alkaline mist is easily discharged with hydrogen.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a hydrogen-alkali mist environmentally friendly centrifugal separation device for hydrogen production, comprising a retainer, an acceleration shell, distribution pipes, acceleration blades, and a feed inlet. The acceleration shell is fixedly installed on the retainer, and the feed inlet is provided at the lower end of the acceleration shell. The acceleration blades are rotatably disposed inside the acceleration shell, and multiple distribution pipes are equally spaced along the outer wall of the acceleration shell and communicate with the acceleration shell to distribute the alkali mist-containing hydrogen gas propelled by the acceleration blades to multiple separation shells.

[0009] Each distribution tube is connected to a separation shell at the end furthest from the acceleration shell. A motor is installed on the separation shell, and the drive end of the motor is connected to a drive shaft. The drive shaft is equipped with an intake blade, a centrifugal blade, and a spiral blade. The intake blade is used to accelerate the alkaline mist hydrogen gas sent into the separation shell through the distribution tube and send it to the contraction tube. The centrifugal blade is used to apply circumferential velocity to the gas after the first separation.

[0010] A contraction tube is coaxially arranged inside the separator shell. The large end of the contraction tube faces the suction blade, and the small end of the contraction tube is provided with a contraction port and connected to the extension tube. The inner diameter of the contraction tube gradually decreases from the end where the suction blade is located to the contraction port. When the gas carries droplets along the contraction tube, the larger droplets adhere to the inner wall of the contraction tube and converge towards the contraction port as the inner diameter decreases.

[0011] The extension tube is coaxially arranged with the drive shaft. The spiral blade is fixedly arranged on the outer wall of the drive shaft and located between the extension tube and the drive shaft. The first water outlet pipe is arranged at the end of the extension tube away from the contraction port. The liquid that converges from the contraction port into the extension tube is transported to the first water outlet pipe along the axial direction of the drive shaft by the rotating spiral blade, so that the liquid obtained from the first separation leaves the gas flow area in time.

[0012] Multiple return pipes are provided on the separator shell. These return pipes are spaced apart circumferentially along the constriction tube. One end of each return pipe corresponds to the position where it connects to the constriction tube and the extension tube, while the other end faces the centrifugal blade. Gas that passes through the constriction tube but does not enter the extension tube returns to the centrifugal blade through the return pipe and is accelerated again by the centrifugal blade.

[0013] A centrifugal shell surrounding the centrifugal blades is set on the separation shell. The centrifugal blades throw the residual alkaline mist droplets toward the inner wall of the centrifugal shell. The centrifugal shell is connected to an inlet pipe, a reciprocating pipe, and a bend pipe. The inlet pipe is located at the lower end of the reciprocating pipe, and the bend pipe is located at the upper end of the reciprocating pipe. The inlet pipe, the reciprocating pipe, and the bend pipe form a wall-attached flow path returning to the centrifugal shell, so that the airflow with a high liquid content can continue to complete gas-liquid separation as it changes direction and extends its flow path.

[0014] A second water outlet pipe is installed at the lower end of the reciprocating tube, and an air outlet pipe is installed at the lower end of the centrifuge shell. The liquid collected along the inner wall of the reciprocating tube is discharged through the second water outlet pipe, and the hydrogen gas after two-stage separation is discharged through the air outlet pipe. This forms a continuous processing process of first shrinking and actively draining the liquid, and second centrifuging and wall-attaching the liquid.

[0015] Beneficial effects This invention uses an acceleration shell and multiple distribution pipes arranged along its circumference to evenly distribute the incoming alkaline mist hydrogen gas to multiple separation shells, thereby reducing the instantaneous flow rate and liquid load borne by a single separation shell and enabling multiple separation channels to simultaneously perform shrinkage and centrifugal separation, which is beneficial to improving the processing capacity under continuous hydrogen production conditions.

[0016] This invention uses a contraction tube with a gradually decreasing inner diameter to cause droplets adhering to the inner wall to converge towards the contraction port. After leaving the contraction port, the liquid continues to concentrate around the drive shaft and enters the space between the extension tube and the drive shaft. The rotating spiral blade then sends the converged liquid to the first water outlet pipe, thereby shortening the time that the separated liquid stays in the high-speed airflow area and reducing re-atomization.

[0017] This invention guides the gas after the first separation to the centrifugal blades through a reflux pipe. The centrifugal blades then increase the circumferential velocity of the gas, causing the fine droplets remaining after the first separation to be thrown against the inner wall of the centrifugal shell. The shrinkage and reflux centrifugation processes the liquid in sequence using different separation actions, which is beneficial for adapting to droplets of different sizes.

[0018] This invention extends the wall-flow path of liquid-containing gas by using an inlet pipe, a reciprocating pipe, and a bend, and changes the direction of the airflow. The heavier residual liquid gathers along the inner wall of the reciprocating pipe towards the second outlet pipe, and the purified hydrogen is discharged through an outlet pipe spaced apart from the second outlet pipe, thereby reducing the possibility of the liquid obtained from the secondary separation re-entering the exhaust path. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the structure of the acceleration shell, distribution pipe and acceleration blade of the present invention.

[0021] Figure 3 This is a cross-sectional view of the separation shell and centrifuge shell of the present invention.

[0022] Figure 4 This is a cross-sectional structural diagram of the shrink tube, the extension tube, and the return tube of the present invention.

[0023] Figure 5 This is an exploded structural diagram of the shrink tube, drive shaft, and centrifugal blades of the present invention.

[0024] Figure 6 This is a cross-sectional structural diagram of the centrifuge shell, reciprocating tube, and bend tube of the present invention.

[0025] Figure 7 This is a schematic diagram showing the positions of the first water outlet pipe, the second water outlet pipe, and the air outlet pipe of the present invention.

[0026] Figure 8 This is a schematic diagram of the structure of the drive shaft and the spiral blade of the present invention.

[0027] Reference numerals: 1. Holder; 2. Accelerator shell; 3. Distributor pipe; 4. Accelerator blade; 5. Feed inlet; 6. Separator shell; 7. Motor; 8. Drive shaft; 9. Suction blade; 10. Centrifugal blade; 11. Contraction pipe; 12. Contraction port; 13. Exit pipe; 14. Spiral blade; 15. First water outlet pipe; 16. Return pipe; 17. Centrifugal shell; 18. Reciprocating pipe; 19. Inlet pipe; 20. Bend pipe; 21. Second water outlet pipe; 22. Air outlet pipe. Detailed Implementation

[0028] like Figures 1 to 8 As shown, this embodiment provides an environmentally friendly centrifugal separation device for hydrogen production using alkaline mist. The retainer 1 is installed on an external device and provides support for the entire device. The acceleration shell 2 is fixedly installed on the retainer 1. Multiple separation shells 6 are arranged around the acceleration shell 2. Hydrogen containing moisture and alkaline droplets passes through the acceleration shell 2, separation shells 6 and centrifugal shell 17 in sequence and is discharged through the outlet pipe 22.

[0029] The lower end of the acceleration shell 2 is provided with a feed inlet 5, which is connected to the output position of the alkaline mist hydrogen of the hydrogen production equipment. An acceleration blade 4 is rotatably installed inside the acceleration shell 2, which is connected to an external drive device. After entering through the feed inlet 5, the alkaline mist hydrogen is pushed by the rotating acceleration blade 4 and forms an airflow that flows to multiple distribution pipes 3 inside the acceleration shell 2.

[0030] Three sets of distribution pipes 3 are equally spaced on the outer wall of the acceleration shell 2. All three sets of distribution pipes 3 are connected to the acceleration shell 2. The end of each distribution pipe 3 away from the acceleration shell 2 is connected to a separation shell 6. After the acceleration blade 4 provides initial kinetic energy to the incoming gas, the three sets of distribution pipes 3 distribute the gas to the three separation shells 6, so that the total gas flow entering the device is dispersed into three parallel processing channels.

[0031] Multiple distribution pipes 3 are arranged at equal intervals along the circumference of the acceleration shell 2, so that the gas in the acceleration shell 2 can be discharged from different circumferential positions. The pressure formed by the gas in the acceleration shell 2 acts on the inlet of the three distribution pipes 3 respectively, thereby reducing the situation where the flow rate of a single distribution pipe 3 is too large and the corresponding separation shell 6 is concentrated, and enabling the three separation shells 6 to perform gas-liquid separation synchronously.

[0032] Each separation shell 6 is equipped with a motor 7. The drive end of the motor 7 is connected to a drive shaft 8. The drive shaft 8 extends along the axis of the separation shell 6. The drive shaft 8 is equipped with a suction blade 9, a centrifugal blade 10, and a spiral blade 14 in sequence. After the motor 7 is started, it drives the drive shaft 8 to rotate, so that the three actions of suction acceleration, centrifugal slinging, and liquid delivery are synchronously driven by the same drive shaft 8.

[0033] The suction vane 9 is located at the position where the distribution pipe 3 supplies air to the separation shell 6. When the suction vane 9 rotates with the drive shaft 8, it causes a continuous airflow to form inside the separation shell 6 toward the contraction pipe 11. The alkaline mist hydrogen gas supplied by the distribution pipe 3 is thus accelerated again and flows toward the large end of the contraction pipe 11. The first acceleration is used to complete the multi-path distribution, and the second acceleration enables each separation shell 6 to form a stable internal processing flow according to the speed of its motor 7.

[0034] The contraction tube 11 is coaxially arranged inside the separation shell 6. The large end of the contraction tube 11 faces the suction blade 9, and the small end of the contraction tube 11 is provided with a contraction port 12. The inner diameter of the contraction tube 11 gradually decreases from the end where the suction blade 9 is located to the contraction port 12. After the alkaline mist hydrogen enters the contraction tube 11, it moves along its axial direction. Due to inertia and contact with the inner wall, the droplets in the gas flow gradually adhere to the inner wall of the contraction tube 11.

[0035] The droplets attached to the inner wall of the contraction tube 11 merge to form a liquid film. The continuously flowing gas pushes the liquid film toward the contraction port 12. The inner diameter of the contraction tube 11 gradually decreases, causing the circumferential position of the liquid film to continuously approach the drive shaft 8. After the liquid leaves the contraction port 12, it still maintains the tendency to converge toward the axis, thus creating a difference in movement path with the gas that mainly flows along the axial direction.

[0036] The extension tube 13 is connected to the side of the constriction port 12 away from the suction blade 9 and is coaxially arranged with the drive shaft 8. The constriction port 12 is located at the end of the extension tube 13 facing the constriction tube 11. The liquid that gathers on the inner wall of the constriction tube 11 leaves the constriction port 12 and enters between the extension tube 13 and the drive shaft 8. The extension tube 13 provides a collection space for the gathered liquid that is independent of the main airflow area of ​​the constriction tube 11.

[0037] The spiral blade 14 is fixedly mounted on the outer wall of the drive shaft 8 and located between the extension tube 13 and the drive shaft 8. The outer edge of the spiral blade 14 is adapted to the inner wall of the extension tube 13. When the drive shaft 8 drives the spiral blade 14 to rotate, the liquid entering the extension tube 13 is axially pushed by the spiral blade 14 and moves away from the contraction port 12, so as to avoid the liquid from staying near the contraction port 12 for a long time and being blown away again by the subsequent airflow.

[0038] The first outlet pipe 15 is located at the end of the extension pipe 13 away from the contraction port 12. The spiral blade 14 extends along the axial direction of the drive shaft 8 to the location of the first outlet pipe 15. The spiral blade 14 continuously transports the liquid entering the extension pipe 13 to the first outlet pipe 15. Under its own gravity and the pushing action of the spiral blade 14, the liquid is discharged through the first outlet pipe 15, thereby completing the active discharge of the liquid obtained from the first gas-liquid separation.

[0039] Multiple return pipes 16 are provided on the separation shell 6. The multiple return pipes 16 are arranged circumferentially along the contraction pipe 11. One end of the return pipe 16 corresponds to the position where the contraction pipe 11 and the extension pipe 13 are connected. The other end of the return pipe 16 faces the centrifugal blade 10. Hydrogen gas that does not enter the extension pipe 13 with the liquid changes its flow direction through the return pipe 16 and returns to the position of the centrifugal blade 10.

[0040] The return pipe 16 separates and guides the gas after the first separation from the liquid that has entered the outlet pipe 13. The liquid is transported to the first outlet pipe 15 by the spiral blade 14, while the gas flows along the return pipe 16 to the centrifugal blade 10. The two flow paths are separated after the contraction port 12, so that the liquid obtained from the first separation does not need to pass through the high-speed rotation area of ​​the centrifugal blade 10 again, thereby reducing the possibility that the liquid will be sheared by the centrifugal blade 10 and reform into a fine mist.

[0041] Centrifugal blade 10 is located on the side of suction blade 9 away from contraction tube 11 and is fixedly connected to drive shaft 8. The outlet of return pipe 16 faces the air inlet side of centrifugal blade 10. After the gas is separated for the first time, it returns and the circumferential speed is increased by the rotating centrifugal blade 10. The fine alkaline mist droplets still entrained in the gas are subjected to centrifugal action and move in a direction away from drive shaft 8.

[0042] The centrifuge shell 17 is coaxially arranged outside the centrifuge blade 10 and surrounds the gas output area of ​​the centrifuge blade 10. After the droplets thrown out by the centrifuge blade 10 reach the inner wall of the centrifuge shell 17, they merge together. The first separation mainly uses the adhesion and centripetal convergence of the inner wall of the contraction tube 11 to deal with the droplets that are easier to adhere to the wall. The second separation uses the circumferential velocity generated by the centrifuge blade 10 to deal with the small droplets remaining after the first separation.

[0043] A receiving pipe 19 is connected to the centrifuge shell 17. The receiving pipe 19 is located at the lower end of the reciprocating pipe 18. The airflow with a large liquid content that gathers along the wall inside the centrifuge shell 17 enters the receiving pipe 19. The receiving pipe 19 guides this part of the airflow to the reciprocating pipe 18. When the airflow enters the receiving pipe 19 from the centrifuge shell 17, the airflow changes direction, making it easier for droplets with greater inertia to continue to adhere to the inner walls of the receiving pipe 19 and the reciprocating pipe 18.

[0044] The reciprocating pipe 18 extends upward from the location of the inlet pipe 19. The upper end of the reciprocating pipe 18 is connected to the bend pipe 20. The end of the bend pipe 20 away from the reciprocating pipe 18 is connected to the centrifuge shell 17. The inlet pipe 19, the reciprocating pipe 18 and the bend pipe 20 form a flow path for gas to return to the centrifuge shell 17. When the liquid-containing gas rises and turns along this path, the droplets continuously contact the pipe wall and converge along the pipe wall, while the gas returns to the centrifuge shell 17 through the bend pipe 20.

[0045] The second outlet pipe 21 is located at the lower end of the reciprocating pipe 18 and below the inlet pipe 19. The liquid attached to the inner walls of the inlet pipe 19, the reciprocating pipe 18 and the bend 20 flows towards the lower end of the reciprocating pipe 18 under the action of gravity and is finally discharged through the second outlet pipe 21. The reciprocating pipe 18 separates the return position of the gas from the discharge position of the liquid, reducing the possibility of the already accumulated liquid returning to the centrifuge shell 17 with the gas.

[0046] The gas outlet pipe 22 is located at the lower end of the centrifuge shell 17 and is spaced apart from the second water outlet pipe 21. After the first separation by the contraction pipe 11, the second separation by the centrifuge blade 10, and the liquid discharge by the reciprocating pipe 18, the hydrogen gas is discharged through the gas outlet pipe 22. The first water outlet pipe 15 and the second water outlet pipe 21 are responsible for discharging the liquid obtained from the two-stage separation, so that the liquid will not accumulate in a single location.

[0047] When the equipment is running, the external drive equipment corresponding to the acceleration blade 4 and the motor 7 on each separation shell 6 are started first. Alkali mist hydrogen gas then enters the acceleration shell 2 through the feed port 5. The acceleration blade 4 makes the gas flow to the three sets of distribution pipes 3. The three sets of distribution pipes 3 send the gas into the corresponding separation shell 6 respectively. The suction blade 9 then pushes the gas entering each separation shell 6 toward the contraction pipe 11.

[0048] When the alkaline mist hydrogen passes through the contraction tube 11, the heavier droplets adhere to the inner wall of the contraction tube 11 and concentrate towards the contraction port 12. The collected liquid enters between the extension tube 13 and the drive shaft 8 and is then transported by the spiral blade 14 to the first water outlet pipe 15. The gas returns to the centrifugal blade 10 through multiple return pipes 16. The liquid and gas obtained from the first separation thus flow continuously along different paths.

[0049] After the return gas reaches the centrifuge blade 10, it accelerates and rotates with the centrifuge blade 10. The residual droplets are thrown against the inner wall of the centrifuge shell 17 and converge at the location of the inlet pipe 19. The gas with a higher liquid content enters the reciprocating pipe 18 through the inlet pipe 19. It continues to separate against the wall in the reciprocating pipe 18 and the bend pipe 20. The liquid flows downward into the second outlet pipe 21, and the gas returns to the centrifuge shell 17 through the bend pipe 20 and is finally discharged from the outlet pipe 22.

[0050] When the flow rate of alkaline mist hydrogen entering the device changes, the acceleration shell 2 first distributes the total flow rate to the three separation shells 6. Each motor 7 maintains the rotation of the corresponding drive shaft 8, suction blade 9, centrifugal blade 10 and spiral blade 14, so that the gas acceleration, droplet centrifugation and liquid discharge actions are synchronized, avoiding the separation effect from being significantly reduced with the flow rate due to relying solely on the inlet airflow speed to drive the internal structure.

[0051] When the alkaline mist content increases, the amount of liquid film formed on the inner wall of the contraction tube 11 increases accordingly. The rotating spiral blade 14 can continuously push the collected liquid towards the first outlet pipe 15, preventing the liquid accumulated at the contraction port 12 from flowing back into the return pipe 16. The liquid generated by the second-stage centrifugation enters the second outlet pipe 21 along the inner wall of the centrifuge shell 17 and the reciprocating pipe 18. The two drainage structures work together to reduce the amount of liquid accumulated inside the device.

[0052] In this embodiment, a multi-channel air supply structure is formed by the retainer 1, the acceleration shell 2, and the distribution pipe 3. A shrinkage and active drainage structure is formed by the motor 7, the drive shaft 8, the suction blade 9, the contraction pipe 11, the contraction port 12, the extension pipe 13, the spiral blade 14, and the first water outlet pipe 15. A reflux centrifugal and wall-mounted drainage structure is formed by the return pipe 16, the centrifugal blade 10, the centrifugal shell 17, the inlet pipe 19, the reciprocating pipe 18, the bend pipe 20, the second water outlet pipe 21, and the air outlet pipe 22. The three structures act sequentially on the alkaline mist hydrogen gas and complete continuous purification.

Claims

1. A hydrogen-alkali mist environmentally friendly centrifugal separation device for hydrogen production, comprising a retainer (1), an accelerating shell (2), and a plurality of distribution pipes (3) arranged circumferentially along the accelerating shell (2), each distribution pipe (3) being connected to a separation shell (6), characterized in that: A motor (7) is installed on the separation shell (6). The transmission end of the motor (7) is connected to the transmission shaft (8). The transmission shaft (8) is equipped with an intake blade (9), a centrifugal blade (10), and a spiral blade (14). A contraction tube (11) is coaxially installed inside the separation shell (6). The small end of the contraction tube (11) is provided with a contraction port (12) and connected to an extension tube (13). The spiral blade (14) is located between the extension tube (13) and the transmission shaft (8). A first water outlet pipe (15) is installed on the extension tube (13). A return pipe (16) facing the centrifugal blade (10) and a centrifugal shell (17) surrounding the centrifugal blade (10) are provided on the separation shell (6). The centrifugal shell (17) is connected with an intake pipe (19), a reciprocating pipe (18), and a bend pipe (20). A second water outlet pipe (21) is installed on the reciprocating pipe (18). An air outlet pipe (22) is installed on the centrifugal shell (17).

2. The hydrogen-alkali mist environmentally friendly centrifugal separation device for hydrogen production according to claim 1, characterized in that: The acceleration shell (2) is fixedly installed on the retainer (1). The lower end of the acceleration shell (2) is provided with a feed port (5). An acceleration blade (4) is rotatably installed inside the acceleration shell (2). Multiple distribution pipes (3) are connected to the acceleration shell (2).

3. The hydrogen-alkali mist environmentally friendly centrifugal separation device for hydrogen production according to claim 2, characterized in that: There are three sets of distribution pipes (3). The three sets of distribution pipes (3) are arranged at equal intervals along the outer wall of the acceleration shell (2). The end of each distribution pipe (3) away from the acceleration shell (2) is connected to a separation shell (6).

4. The hydrogen-alkali mist environmentally friendly centrifugal separation device for hydrogen production according to claim 1, characterized in that: The drive shaft (8), the constriction tube (11) and the extension tube (13) are coaxially arranged. The suction blade (9) is located on one side of the large end of the constriction tube (11). The inner diameter of the constriction tube (11) gradually decreases from the end where the suction blade (9) is located to the constriction port (12).

5. The hydrogen-alkali mist environmentally friendly centrifugal separation device for hydrogen production according to claim 4, characterized in that: The extension tube (13) is connected to the side of the contraction port (12) away from the suction blade (9), and the spiral blade (14) is fixedly installed on the outer wall of the drive shaft (8). The outer edge of the spiral blade (14) is adapted to the inner wall of the extension tube (13).

6. The hydrogen-alkali mist environmentally friendly centrifugal separation device for hydrogen production according to claim 5, characterized in that: The first water outlet pipe (15) is located at the end of the extension pipe (13) away from the contraction port (12), and the spiral blade (14) extends from the contraction port (12) to the location of the first water outlet pipe (15) along the axial direction of the drive shaft (8).

7. The hydrogen-alkali mist environmentally friendly centrifugal separation device for hydrogen production according to claim 1, characterized in that: Multiple return pipes (16) are provided. Multiple return pipes (16) are arranged at intervals along the circumference of the contraction pipe (11). One end of the return pipe (16) corresponds to the position where it is connected to the contraction pipe (11) and the extension pipe (13). The other end of the return pipe (16) faces the centrifugal blade (10).

8. The hydrogen-alkali mist environmentally friendly centrifugal separation device for hydrogen production according to claim 7, characterized in that: The centrifugal blade (10) is located on the side of the suction blade (9) away from the constriction tube (11), and the centrifugal shell (17) is coaxially located on the outside of the centrifugal blade (10). The return pipe (16) guides the gas passing through the constriction tube (11) to the air intake side of the centrifugal blade (10).

9. The hydrogen-alkali mist environmentally friendly centrifugal separation device for hydrogen production according to claim 1, characterized in that: The inlet pipe (19) is located at the lower end of the reciprocating pipe (18) and is connected to the centrifuge shell (17). The bend pipe (20) is located at the upper end of the reciprocating pipe (18) and is connected to the centrifuge shell (17). The inlet pipe (19), the reciprocating pipe (18) and the bend pipe (20) form a wall-attached flow path for gas to return to the centrifuge shell (17).

10. The hydrogen-alkali mist environmentally friendly centrifugal separation device for hydrogen production according to claim 9, characterized in that: The second water outlet pipe (21) is located at the lower end of the reciprocating pipe (18) and below the inlet pipe (19). The air outlet pipe (22) is located at the lower end of the centrifuge shell (17). The second water outlet pipe (21) and the air outlet pipe (22) are spaced apart from each other.

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