An integrated gas-liquid separation bipolar plate, electrolytic cell and hydrogen production method

Abstract

The present invention discloses an integrated gas-liquid separation bipolar plate, an electrolytic cell and a hydrogen production method. The bipolar plate includes a bipolar frame and a partition plate inside the bipolar frame. The bottom of the bipolar frame is provided with lye flow channel holes, and the top is provided with a first gas flow channel hole and a second gas flow channel hole. A gas-liquid separation box is arranged at the connection between the top of the partition plate and the bipolar frame. A dividing plate is arranged inside the gas-liquid separation box. The dividing plate divides the gas-liquid separation box into a front side air inlet cavity and a rear side separation cavity, and the upper part is provided with mesh holes. An air inlet hole is arranged at the bottom of the front side air inlet cavity, and an air outlet hole is arranged at the top of the rear side separation cavity. An air vent groove is arranged on the bipolar frame between the air outlet hole and the corresponding first gas flow channel hole or the second gas flow channel hole. Return grooves are arranged on both side surfaces of the bipolar frame. The top of the return groove is connected to the bottom side of the rear side separation cavity and the inside of the bipolar frame in a penetrating manner. The electrolytic cell uses the above bipolar plate and provides a hydrogen production method, which can effectively improve the gas purity, effectively reduce the lye circulation amount, and improve the preparation efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of electrolytic hydrogen production, and particularly relates to an integrated gas-liquid separation bipolar plate, electrolytic cell and hydrogen production method. Background Art

[0002] In a water electrolysis hydrogen production system, hydrogen and oxygen are respectively generated at the cathode and anode, enter the hydrogen and oxygen flow channels together with a large amount of alkali solution, and the hydrogen and oxygen are in the form of bubbles wrapped by the alkali solution, and then enter the hydrogen and oxygen gas-liquid separation tanks respectively for gas-liquid separation, washing, etc.

[0003] In a traditional electrolytic cell, there are hydrogen and a large amount of alkali solution, oxygen and a large amount of alkali solution in the hydrogen flow channel and oxygen flow channel respectively. Since the alkali solution has good electrical conductivity and there is a potential difference in the flow channels of different bipolar plates, when a leakage current occurs, hydrogen evolution and oxygen evolution reactions will occur between different bipolar plates corresponding to the hydrogen flow channel and oxygen flow channel, resulting in a decrease in the purity of hydrogen and oxygen in the hydrogen flow channel and oxygen flow channel.

[0004] Specifically, the traditional electrolytic cell has the following problems:

[0005] 1. The discharge of a large amount of alkali solution requires more alkali solution to be supplemented, increasing the external alkali solution circulation volume and at the same time increasing the AC energy consumption of auxiliary machines.

[0006] 2. The increase in the alkali solution circulation volume will lead to an increase in the leakage current, increasing the DC energy consumption of the electrolytic cell and reducing the gas purity.

[0007] 3. Since there is more alkali solution in both the hydrogen flow channel and the oxygen flow channel, the gas can only be obtained by entering the gas-liquid separation tank for separation, and the gas-liquid separation tank occupies a large area. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide an integrated gas-liquid separation bipolar plate, electrolytic cell and hydrogen production method, which can effectively improve the gas purity, effectively reduce the alkali solution circulation volume and improve the preparation efficiency.

[0009] To solve the above technical problems, the present invention provides an integrated gas-liquid separation bipolar plate, which includes a bipolar frame and a partition plate disposed within the bipolar frame. The bottom of the bipolar frame is provided with lye flow channel holes, and the top is provided with a first gas flow channel hole and a second gas flow channel hole. A gas-liquid separation box is provided at the connection between the top of the partition plate and the bipolar frame. A dividing plate is disposed within the gas-liquid separation box, and the dividing plate divides the gas-liquid separation box into a front side intake cavity and a rear side separation cavity. Mesh holes are provided in the upper part of the dividing plate. An intake hole is provided at the bottom of the front side intake cavity, and an air outlet hole is provided at the top of the rear side separation cavity. A ventilation groove is provided on the bipolar frame between the air outlet hole and the corresponding first gas flow channel hole or the second gas flow channel hole. Return grooves are provided on both surfaces of the bipolar frame, and the top of the return groove is connected in communication with one side of the bottom of the rear side separation cavity, and the bottom of the return groove is connected in communication with the inner side of the bipolar frame below the gas-liquid separation box.

[0010] Further, a bent edge is provided at the bottom of the dividing plate, and the bent edge is hermetically connected to the surface of the partition plate. A rear side separation cavity is formed by the cooperation between the dividing plate and the partition plate, and the side edge of the dividing plate is hermetically connected to the inner wall of the bipolar frame.

[0011] Further, the gas-liquid separation box includes an outer housing, and the outer housing covers the dividing plate and is hermetically fixed. The front side intake cavity and the rear side separation cavity are formed by the cooperation of the surface of the partition plate, the inner wall of the outer housing, and the dividing plate.

[0012] Further, the upper part of the dividing plate corresponding to the mesh holes is inclined and abuts against the inner wall of the outer housing.

[0013] Further, fixing edge strips are provided on the outer periphery of the outer housing, positioning grooves are provided on the bipolar frame corresponding to the fixing edge strips, and the fixing edge strips are disposed within the positioning grooves and hermetically fixed.

[0014] Further, a cathode assembly and an anode assembly are respectively provided on both surfaces of the partition plate below the gas-liquid separation box. A cathode conductive support bar is provided between the cathode assembly and the partition plate and cooperates to form a cathode side lye cavity, and an anode conductive trapezoidal tube is provided between the anode assembly and the partition plate and cooperates to form an anode side lye cavity.

[0015] An electrolytic cell includes the integrated gas-liquid separation bipolar plate according to any one of the above.

[0016] Further, a bracket is further included. The integrated gas-liquid separation bipolar plate is disposed within the bracket, and lye pipes, a first air outlet pipe, and a second air outlet pipe connected to the integrated gas-liquid separation bipolar plate are provided on the bracket.

[0017] Further, the lye pipeline is connected to the lye water tank, the first air outlet pipeline is connected to the intake end of the first three-way pipe, the air outlet end and the liquid outlet end of the first three-way pipe are respectively connected to the first demister and the heat exchanger, the second air outlet pipeline is connected to the intake end of the second three-way pipe, the air outlet end and the liquid outlet end of the second three-way pipe are respectively connected to the second demister and the heat exchanger, the heat exchanger is connected to the lye pipeline through a canned motor pump, the first demister, the second demister and the heat exchanger are all connected to the cooling water inlet and outlet pipeline, and the first demister and the second demister are also connected to the deionized water tank;

[0018] Separation spaces are arranged inside the first three-way pipe and the second three-way pipe. An intake end is arranged laterally upward in the middle of the separation space, a liquid outlet end is arranged at the bottom of the separation space, and an air outlet end is arranged at the top of the separation space.

[0019] A hydrogen production method using the electrolytic cell described above includes the following steps:

[0020] Step 1) First, add 30% KOH to the lye water tank. Send the lye in the lye water tank into the electrolytic cell through a pipeline by a canned motor pump. After meeting the startup conditions, energize the electrolytic cell in stages according to the process requirements;

[0021] Step 2) After the electrolytic cell is energized, gases are generated. The gases are hydrogen and oxygen. Due to the air flotation rising principle and the liquid surface tension, both hydrogen and oxygen rise in the form of bubbles. During the rising process, the bubbles collide with the lye, which will push part of the lye to move upward and enter the corresponding gas-liquid separation box. The gas-liquid separation box breaks the bubbles. The gas carries a small amount of lye into the first gas flow channel hole and the second gas flow channel hole, and is discharged from the first air outlet pipeline and the second air outlet pipeline; the lye after the bubbles are broken flows back to the corresponding lye cavity from the reflux tank;

[0022] Step 3) The hydrogen and oxygen discharged from the first air outlet pipeline and the second air outlet pipeline are subjected to gas-liquid separation by the separation spaces arranged inside the first three-way pipe and the second three-way pipe. The separated gas enters the corresponding first demister and second demister for demisting, washing and then enters the subsequent purification system. The separated lye enters the heat exchanger to be cooled;

[0023] Step 4) The cooled lye flows back into the electrolytic cell through a canned motor pump.

[0024] The beneficial effects of the present invention:

[0025] 1. The gas-liquid separation box inside the bipolar plate realizes the gas-liquid separation effect, and at the same time completes the circulation of the lye inside the bipolar plate, increasing the flow rate of the lye inside the bipolar plate and making the bubbles more likely to escape, thereby achieving the effect of reducing energy consumption.

[0026] 2. The gas-liquid separation box can effectively separate the lye from the gas. Hydrogen and a small amount of lye enter the hydrogen gas flow channel, increasing the resistance in the channel. According to Ohm's law, the leakage current decreases, the hydrogen evolution and oxygen evolution reactions in the channel weaken, and the gas purity is improved.

[0027] 3. Since the lye content in the gas is low, the external auxiliary machine circulation volume of the lye is effectively reduced, the energy consumption is reduced, and the gas purity is improved. And due to the principle of air flotation rising, the gas drives the liquid to rise, increasing the circulation volume inside the bipolar plate, increasing the lye flow rate, and making the gas more likely to escape. There is no need for a separate gas-liquid separation tank, reducing the floor area and the auxiliary machine cost. Brief Description of the Drawings

[0028] Figure 1 is a schematic diagram of the overall structure of the bipolar plate of the present invention;

[0029] Figure 2 is a schematic diagram of the cooperation structure of the pole frame and the gas-liquid separation box of the present invention;

[0030] Figure 3 is a schematic diagram of the front structure of the gas-liquid separation box of the present invention;

[0031] Figure 4 is a schematic diagram of the back structure of the gas-liquid separation box of the present invention;

[0032] Figure 5 is a schematic diagram of the gas-liquid separation flow direction of the present invention;

[0033] Figure 6 is a schematic diagram of the cross-sectional structure of the pole frame and the gas-liquid separation box of the present invention;

[0034] Figure 7 is an exploded schematic diagram of the connection structure of the bipolar plate, the cathode assembly and the anode assembly of the present invention;

[0035] Figure 8 is a schematic diagram of the electrolytic cell structure of the present invention;

[0036] Figure 9 is a schematic diagram of the connection between the electrolytic cell and the auxiliary machine of the present invention;

[0037] Figure 10 is a schematic diagram of the cross-sectional structure of the three-way structure of the present invention.

[0038] In the figure: 1. Pole frame; 2. Partition board; 3. Alkaline solution flow channel hole; 4. First gas flow channel hole; 5. Second gas flow channel hole; 6. Gas-liquid separation box; 7. Partition plate; 8. Front-side air inlet cavity; 9. Rear-side separation cavity; 10. Mesh hole; 11. Air inlet hole; 12. Air outlet hole; 13. Ventilation groove; 14. Return groove; 15. Bent edge; 16. Outer housing; 17. Fixed edge strip; 18. Positioning groove; 19. Cathode assembly; 20. Anode assembly; 21. Integrated gas-liquid separation bipolar plate; 22. Bracket; 23. Alkaline solution pipeline; 24. First air outlet pipeline; 25. Second air outlet pipeline; 26. Alkaline water tank; 27. First three-way joint; 28. First demisting tank; 29. Heat exchanger; 30. Second three-way joint; 31. Second demisting tank; 32. Shielded pump; 33. Deionized water tank; 34. Separation space; 35. Air inlet end; 36. Liquid outlet end; 37. Air outlet end; 111. Electrolytic cell; 112. Cathode conductive support strip; 113. Cathode bottom mesh; 114. Buffer mesh; 115. Cathode woven mesh; 116. Anode conductive ladder-shaped pipe; 117. Anode mesh. Specific embodiments

[0039] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the specific embodiments cited are not intended to limit the present invention.

[0040] Referring to Figures 1 to 6 As shown, in an embodiment of the integrated gas-liquid separation bipolar plate of the present invention, it includes a pole frame 1 and a partition board 2 arranged inside the pole frame. The bottom of the pole frame is provided with an alkaline solution flow channel hole 3, the top is provided with a first gas flow channel hole 4 and a second gas flow channel hole 5. A gas-liquid separation box 6 is arranged at the connection between the top of the partition board and the pole frame. A partition plate 7 is arranged inside the gas-liquid separation box. The partition plate divides the gas-liquid separation box into a front-side air inlet cavity 8 and a rear-side separation cavity 9. Mesh holes 10 are arranged on the upper part of the partition plate. An air inlet hole 11 is arranged at the bottom of the front-side air inlet cavity. An air outlet hole 12 is arranged at the top of the rear-side separation cavity. A ventilation groove 13 is arranged on the pole frame between the air outlet hole and the corresponding first gas flow channel hole or second gas flow channel hole. Return grooves 14 are arranged on both surfaces of the pole frame. The top of the return groove is connected to the bottom of the rear-side separation cavity on one side, and the bottom of the return groove is connected to the inner side of the pole frame below the gas-liquid separation box.

[0041] During the use of the integrated gas-liquid separation bipolar plate, the return groove and the ventilation groove are both surface-sealed with gaskets to form flow channels. When in use, referring to Figure 7As shown, a cathode assembly 19 and an anode assembly 20 are respectively arranged on the two side surfaces of the partition below the gas-liquid separation box. A cathode conductive support bar 112 is arranged between the cathode assembly and the partition and cooperates to form a cathode-side alkaline solution chamber. The cathode assembly includes a cathode bottom mesh 113, a buffer mesh 114, and a cathode woven mesh 115. An anode conductive ladder-shaped tube 116 is arranged between the anode assembly and the partition and cooperates to form an anode-side alkaline solution chamber. The anode assembly includes an anode mesh 117. After being placed in the electrolytic cell, hydrogen and oxygen are electrolytically generated in the alkaline solution chamber formed between the partition and the adjacent cathode assembly and anode assembly. Taking hydrogen as an example, hydrogen evolution reaction occurs on the cathode woven mesh for hydroxide ions to generate hydrogen. Due to the air flotation ascending principle and liquid surface tension, hydrogen floats in the form of bubbles. During the floating process, the hydrogen bubbles collide with the alkaline solution, which will push part of the alkaline solution to move upward. The hydrogen bubbles and part of the alkaline solution enter the front-side intake chamber in the gas-liquid separation box through the pores. Continuing to move upward from the front-side intake chamber, they will pass through the pores on the partition plate. After the hydrogen bubbles pass through the pores with defoaming function, the hydrogen bubbles will be broken into hydrogen gas and alkaline solution and enter the rear-side separation chamber. The hydrogen gas and a small amount of alkaline solution enter the first gas flow channel hole through the ventilation groove and are finally drained out; the alkaline solution pushed by the hydrogen bubbles and the alkaline solution broken by the bubbles enter the bottom of the rear-side separation chamber due to gravity and can enter the bottom of the bipolar plate along the return grooves on both sides of the bipolar plate to participate in the next hydrogen evolution reaction, and so on in a cycle.

[0042] Therefore, during the whole process, the gas-liquid separation box can effectively intercept most of the alkaline solution brought into the gas flow channel by the rising gas, so that only gas and a small amount of alkaline solution enter the gas flow channel. The resistance in the flow channel increases. According to Ohm's law, the leakage current decreases, and the hydrogen evolution and oxygen evolution reactions in the flow channel weaken, and the gas purity is improved. And the intercepted and separated alkaline solution can also flow back to the alkaline solution chamber. The return position can be on one side of the bottom of the alkaline solution chamber, which can increase the flow rate of the alkaline solution inside the bipolar plate and make the bubbles more likely to escape, so as to reduce the energy consumption.

[0043] A bending edge 15 is arranged at the bottom of the above-mentioned partition plate. The bending edge is hermetically connected to the surface of the partition plate. The partition plate and the partition cooperate to form a rear-side separation chamber. The side of the partition plate is hermetically connected to the inner wall of the bipolar plate, which can be fixed by welding. The gas-liquid separation box includes a housing 16. The housing covers the partition plate and is hermetically fixed, which can be fixed by welding. The surface of the partition plate, the inner wall of the housing, and the partition plate cooperate to form a front-side intake chamber and a rear-side separation chamber. Through the cooperation of the partition plate and the housing, a cavity is effectively formed on the surface of the partition plate, which can greatly reduce the thickness of the gas-liquid separation box.

[0044] The upper part of the partition plate corresponding to the above-mentioned mesh holes is set to be inclined and abuts against the inner wall of the outer shell. The abutting part can be welded and connected into one body to ensure the strength of the overall structure. The inclined part can increase the contact surface with the gas, so as to better intercept the lye. In the fixing structure of the outer shell, a fixing edge strip 17 can be provided on the outer periphery of the outer shell, and a positioning groove 18 is provided on the pole frame corresponding to the fixing edge strip. The fixing edge strip is arranged in the positioning groove and sealed and fixed, which has a good positioning and installation effect, and the sealing effect is also greatly improved.

[0045] Referring to Figure 8 As shown, the present application also discloses an electrolytic cell 111, which includes the above-mentioned integrated gas-liquid separation bipolar plate 21, so that the lye can be effectively reused in the electrolytic cell. The electrolytic cell further includes a bracket 22. The integrated gas-liquid separation bipolar plate is arranged in the bracket. An alkali liquid pipe 23, a first gas outlet pipe 24 and a second gas outlet pipe 25 connected to the integrated gas-liquid separation bipolar plate are arranged on the bracket. The alkali liquid pipe is used to provide lye and enter the alkali liquid chamber through the lye flow channel holes of the integrated gas-liquid separation bipolar plate. The first gas outlet pipe and the second gas outlet pipe are respectively used to discharge oxygen and hydrogen.

[0046] Referring to Figure 9 As shown, for the discharged gas, since there is still a small amount of lye in the gas, effective separation is still required, and the gas also needs to be processed. Compared with the existing gas-liquid separation tank, the lye is intercepted in the electrolytic cell in the present application, so there is no longer a need to use a large-volume gas-liquid separation tank. Specifically, the auxiliary structure of the electrolytic cell is as follows: the alkali liquid pipe is connected to an alkali water tank 26, the first gas outlet pipe is connected to the inlet end of a first three-way pipe 27, the outlet end and the liquid outlet end of the first three-way pipe are respectively connected to a first demisting tank 28 and a heat exchanger 29, the second gas outlet pipe is connected to the inlet end of a second three-way pipe 30, the outlet end and the liquid outlet end of the second three-way pipe are respectively connected to a second demisting tank 31 and the heat exchanger, the heat exchanger is connected to the alkali liquid pipe through a canned motor pump 32, the first demisting tank, the second demisting tank and the heat exchanger are all connected to the cooling water inlet and outlet pipes, and the first demisting tank and the second demisting tank are also connected to a deionized water tank 33. The deionized water tank supplies pure water for the washing process of the first demisting tank and the second demisting tank.

[0047] Specifically, the above three-way structure is as Figure 10As shown, a separation space 34 is provided inside both the first three-way joint and the second three-way joint. An air inlet end 35 is provided laterally upward in the middle of the separation space, a liquid outlet end 36 is provided at the bottom of the separation space, and an air outlet end 37 is provided at the top of the separation space. During operation, the gas containing a small amount of lye enters the separation space from the air inlet end. The lye falls back to the bottom of the separation space due to its weight, while the gas continues to be discharged from the air outlet end at the top of the separation space. The accumulated lye will be discharged from the liquid outlet end below the air inlet end on the side. Here, the liquid pumping function of the canned motor pump forms the liquid discharge power.

[0048] The present application also discloses a hydrogen production method. When in use, 30% KOH is loaded in the alkali water tank and enters the alkali liquid pipeline of the electrolytic cell under the action of the canned motor pump. After meeting the startup conditions, power is supplied in stages according to the process requirements.

[0049] After the electrolytic cell is powered on, hydrogen and oxygen are generated. The hydrogen and oxygen are discharged from the first air outlet pipeline and the second air outlet pipeline after passing through the corresponding gas-liquid separation boxes. After being discharged, the hydrogen gas and a small amount of lye first pass through the corresponding first three-way joint and second three-way joint. The volume of the three-way pipe is slightly larger than that of the existing three-way structure. Under the action of gravity, the hydrogen gas enters the hydrogen demisting tank upward, and the oxygen gas enters the oxygen demisting tank upward, that is, the first demisting tank and the second demisting tank, and then enters the purification system after demisting and washing. The lye in the first three-way joint and the second three-way joint can flow from the other side along the pipeline and pass through the heat exchanger to cool the lye. At the same time, the liquid after washing in the first demisting tank and the second demisting tank also flows into the heat exchanger for cooling. The liquid includes pure water, impurities washed off, and part of the lye mixed in the liquid. Finally, it flows back to the electrolytic cell under the action of the canned motor pump. A filter is also provided in front of the canned motor pump to filter impurities and other substances in the heat exchanger.

[0050] Through the setting of the three-way joint, the small amount of lye contained in the gas can be effectively intercepted again, so there is no need to use a gas-liquid separation tank, effectively reducing the floor area and use cost of the equipment.

[0051] The above embodiments are only preferred embodiments given to fully illustrate the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention.

Claims

1. An electrolytic cell, characterized in that, Comprising an integrated gas-liquid separation bipolar plate, the integrated gas-liquid separation bipolar plate includes a bipolar plate frame and a separator disposed within the bipolar plate frame. The bottom of the bipolar plate frame is provided with lye flow channel holes, and the top is provided with a first gas flow channel hole and a second gas flow channel hole. A gas-liquid separation box is provided at the connection between the top of the separator and the bipolar plate frame. A partition plate is disposed within the gas-liquid separation box, and the partition plate divides the gas-liquid separation box into a front side intake chamber and a rear side separation chamber. The upper part of the partition plate is provided with mesh holes. An intake hole is provided at the bottom of the front side intake chamber, and an exhaust hole is provided at the top of the rear side separation chamber. A ventilation groove is provided on the bipolar plate frame between the exhaust hole and the corresponding first gas flow channel hole or second gas flow channel hole. Return grooves are provided on both side surfaces of the bipolar plate frame. The top of the return groove is connected to the bottom side of the rear side separation chamber in a through manner, and the bottom of the return groove is connected to the inner side of the bipolar plate frame below the gas-liquid separation box; Further comprising a bracket, the integrated gas-liquid separation bipolar plate is disposed within the bracket, and lye pipes, a first exhaust pipe, and a second exhaust pipe connected to the integrated gas-liquid separation bipolar plate are provided on the bracket; The lye pipe is connected to a lye water tank, the first exhaust pipe is connected to the intake end of a first three-way pipe, the exhaust end and the liquid outlet end of the first three-way pipe are respectively connected to a first demister and a heat exchanger, the second exhaust pipe is connected to the intake end of a second three-way pipe, the exhaust end and the liquid outlet end of the second three-way pipe are respectively connected to a second demister and a heat exchanger, the heat exchanger is connected to the lye pipe through a canned motor pump, the first demister, the second demister, and the heat exchanger are all connected to a cooling water inlet and outlet pipe, and the first demister and the second demister are also connected to a deionized water tank; Separation spaces are provided inside the first three-way pipe and the second three-way pipe. An intake end is provided on the side upward in the middle of the separation space, a liquid outlet end is provided at the bottom of the separation space, and an exhaust end is provided at the top of the separation space.

2. The electrolytic cell according to claim 1, wherein A bent edge is provided at the bottom of the partition plate, and the bent edge is hermetically connected to the surface of the separator. A rear side separation chamber is formed by the cooperation between the partition plate and the separator, and the side of the partition plate is hermetically connected to the inner wall of the bipolar plate frame.

3. The electrolytic cell according to claim 1, characterized in that, The gas-liquid separation box includes an outer housing, and the outer housing covers the partition plate and is hermetically fixed. The front side intake chamber and the rear side separation chamber are formed by the cooperation of the surface of the separator, the inner wall of the outer housing, and the partition plate.

4. The electrolytic cell according to claim 3, characterized in that, The upper part of the partition plate corresponding to the mesh holes is inclined and abuts against the inner wall of the outer housing.

5. The electrolytic cell according to claim 3, characterized in that A fixing edge strip is provided on the outer periphery of the outer housing, a positioning groove is provided on the corresponding bipolar plate frame, and the fixing edge strip is disposed within the positioning groove and hermetically fixed.

6. The electrolytic cell according to claim 1, characterized in that, Cathode assemblies and anode assemblies are respectively provided on both side surfaces of the separator below the gas-liquid separation box. A cathode conductive support strip is provided between the cathode assembly and the separator and cooperates to form a cathode side lye chamber, and an anode conductive ladder tube is provided between the anode assembly and the separator and cooperates to form an anode side lye chamber.

7. A hydrogen production method, characterized in that, Using the electrolytic cell as described in claim 1, comprising the following steps: Step 1) First, add 30% KOH into the alkali water tank. Then, use a canned motor pump to send the alkali liquid in the alkali water tank into the electrolytic cell through a pipeline. After meeting the start-up conditions, energize the electrolytic cell in stages according to the process requirements. Step 2) After the electrolytic cell is energized, gases are generated, which are hydrogen and oxygen. Due to the air flotation principle and the liquid surface tension, both hydrogen and oxygen float in the form of bubbles. During the floating process, the bubbles collide with the alkali liquid, which will push part of the alkali liquid upward and into the corresponding gas-liquid separation box. The gas-liquid separation box breaks the bubbles, and the gas carrying a small amount of alkali liquid enters the first gas flow channel hole and the second gas flow channel hole, and is discharged from the first gas outlet pipe and the second gas outlet pipe; the alkali liquid after the bubbles are broken flows back to the corresponding alkali liquid cavity from the reflux tank. Step 3) The hydrogen and oxygen discharged from the first gas outlet pipe and the second gas outlet pipe are subjected to gas-liquid separation in the separation spaces provided inside the first three-way valve and the second three-way valve. The separated gas enters the corresponding first demisting tank and second demisting tank for demisting, washing and then enters the subsequent purification system. The separated alkali liquid enters the heat exchanger for cooling. Step 4) The cooled alkali liquid is refluxed into the electrolytic cell through a canned motor pump.

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