Integrated gas-liquid separation type bipolar plate, electrolytic bath and hydrogen production method

Abstract

The invention discloses an integrated gas-liquid separation type bipolar plate, an electrolytic bath and a hydrogen production method.The bipolar plate comprises a pole frame and a partition plate in the pole frame, an alkali liquor runner hole is formed in the bottom of the pole frame, a first gas runner hole and a second gas runner hole are formed in the top of the pole frame, and a gas-liquid separation box is arranged at the joint of the top of the partition plate and the pole frame; a partition plate is arranged in the gas-liquid separation box and divides the gas-liquid separation box into a front gas inlet cavity and a rear separation cavity, meshes are formed in the upper portion of the gas-liquid separation box, a gas inlet hole is formed in the bottom of the front gas inlet cavity, and a gas outlet hole is formed in the top of the rear separation cavity. Vent grooves are formed in the positions, between the air outlet holes and the corresponding first gas flow channel holes or the second gas flow channel holes, of the pole frame, backflow grooves are formed in the surfaces of the two sides of the pole frame, and the tops of the backflow grooves are in through connection with one side of the bottom of the rear-side separation cavity and the inner side of the pole frame. The bipolar plate is applied to the electrolytic bath, and the hydrogen production method is provided, so that the gas purity is effectively improved, the alkali liquor circulation volume can be effectively reduced, and the preparation efficiency is improved.

Description

Technical Field

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

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

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

[0004] Specifically, the conventional electrolyzer has the following problems: 1. The discharge of a large amount of alkali solution requires more alkali solution to be added, which increases the external alkali solution circulation volume and increases the auxiliary machine AC energy consumption.

[0005] 2. The increase in the circulation volume of alkali solution will lead to an increase in leakage current, increase the DC energy consumption of the electrolytic cell, and reduce the gas purity.

[0006] 3. Since there is a lot of alkali liquid in the hydrogen flow channel and the oxygen flow channel, they need to enter the gas-liquid separation tank for separation to obtain gas, and the gas-liquid separation tank occupies a large area. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide an integrated gas-liquid separation bipolar plate, an electrolyzer and a hydrogen production method, which can effectively improve the gas purity, and can effectively reduce the circulation amount of alkali solution and improve the preparation efficiency.

[0008] In order to solve the above technical problems, the present invention provides an integrated gas-liquid separation bipolar plate, including a pole frame and a partition arranged in the pole frame, the pole frame is provided with an alkali liquid flow channel hole at the bottom, and a first gas flow channel hole and a second gas flow channel hole at the top, a gas-liquid separation box is provided at the connection between the top of the partition and the pole frame, a partition plate is provided in the gas-liquid separation box, the partition plate divides the gas-liquid separation box into a front air inlet cavity and a rear separation cavity, a mesh is provided on the upper part of the partition plate, an air inlet hole is provided at the bottom of the front air inlet cavity, an air outlet hole is provided at the top of the rear separation cavity, a ventilation groove is provided on the pole frame between the air outlet hole and the corresponding first gas flow channel hole or the second gas flow channel hole, and a reflux groove is provided on both side surfaces of the pole frame, the top of the reflux groove is through-connected with one side of the bottom of the rear separation cavity, and the bottom of the reflux groove is through-connected with the inner side of the pole frame below the gas-liquid separation box.

[0009] Furthermore, a bent edge is provided at the bottom of the partition plate, the bent edge is sealed and connected to the surface of the partition plate, the partition plate and the partition plate cooperate to form a rear separation cavity, and the side edge of the partition plate is sealed and connected to the inner wall of the pole frame.

[0010] Furthermore, the gas-liquid separation box comprises an outer shell, the outer shell cover is arranged on the partition plate and is sealed and fixed, and the partition plate surface, the inner wall of the outer shell and the partition plate cooperate to form a front air inlet cavity and a rear separation cavity.

[0011] Furthermore, the upper portion of the dividing plate corresponding to the mesh is arranged in an inclined shape and abuts against the inner wall of the outer shell.

[0012] Furthermore, a fixed side strip is provided on the outer periphery of the outer shell, a positioning groove is provided on the pole frame corresponding to the fixed side strip, and the fixed side strip is arranged in the positioning groove and sealed and fixed.

[0013] Furthermore, a cathode assembly and an anode assembly are respectively arranged on the surfaces of both sides of the partition below the gas-liquid separation box, a cathode conductive support bar is arranged between the cathode assembly and the partition to form a cathode side alkaline liquid cavity, and an anode conductive elliptical tube is arranged between the anode assembly and the partition to form an anode side alkaline liquid cavity.

[0014] An electrolytic cell comprises any one of the above-mentioned integrated gas-liquid separation bipolar plates.

[0015] Furthermore, it also includes a bracket, the integrated gas-liquid separation bipolar plate is arranged in the bracket, and the bracket is provided with an alkaline liquid pipeline, a first gas outlet pipeline and a second gas outlet pipeline connected to the integrated gas-liquid separation bipolar plate.

[0016] Further, the alkali liquid pipeline is connected to the alkali water tank, the first air outlet pipeline is connected to the air inlet end of the first tee, the air outlet end and the liquid outlet end of the first tee are respectively connected to the first demister tank and the heat exchanger, the second air outlet pipeline is connected to the air inlet end of the second tee, the air outlet end and the liquid outlet end of the second tee are respectively connected to the second demister tank and the heat exchanger, the heat exchanger is connected to the alkali liquid pipeline through a shielded pump, the first demister tank, the second demister tank and the heat exchanger are all connected to the cooling water inlet and outlet pipelines, and the first demister tank and the second demister tank are also connected to the deionized water tank; A separation space is provided inside each of the first tee and the second tee. An air inlet is provided on the side of the middle of the separation space, a liquid outlet is provided at the bottom of the separation space, and an air outlet is provided at the top of the separation space.

[0017] A method for producing hydrogen, using the electrolyzer described above, comprises the following steps: Step 1) First, add 30% KOH into the alkaline water tank, and use the shielded pump to send the alkaline solution in the alkaline water tank into the electrolytic cell through the pipeline. After the startup conditions are met, the electrolytic cell is powered on in stages according to the process requirements; Step 2) After the electrolytic cell is powered on, gas is generated. The gas is hydrogen and oxygen. Due to the principle of gas flotation and the surface tension of the liquid, hydrogen and oxygen float up in the form of bubbles. During the floating process, the bubbles collide with the alkali solution, which pushes part of the alkali solution upward and enters the corresponding gas-liquid separation box. The gas-liquid separation box breaks the bubbles, and the gas carries a small amount of alkali solution into 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 solution after the bubbles are broken flows back from the reflux tank to the corresponding alkali solution cavity; Step 3) The hydrogen and oxygen discharged from the first gas outlet pipe and the second gas outlet pipe are separated into gas and liquid in the separation space provided inside the first tee and the second tee, and the separated gases enter the corresponding first and second demisters for demisting and washing and enter the subsequent purification system, and the separated alkali liquid enters the heat exchanger for cooling; Step 4) The cooled alkali solution flows back into the electrolytic cell through a shielded pump.

[0018] Beneficial effects of the present invention: 1. The gas-liquid separation box in the bipolar plate achieves the gas-liquid separation effect, and at the same time completes the circulation of the alkaline solution inside the bipolar plate, which increases the flow rate of the alkaline solution inside the bipolar plate and makes it easier for bubbles to escape, thereby achieving the effect of reducing energy consumption.

[0019] 2. The gas-liquid separation box can effectively separate the alkali liquid from the gas. Hydrogen and a small amount of alkali liquid enter the hydrogen flow channel, which increases the resistance in the flow channel. According to Ohm's law, the leakage current is reduced, the hydrogen and oxygen evolution reactions in the flow channel are weakened, and the gas purity is improved.

[0020] 3. Due to the low content of alkali in the gas, the circulation volume of the external auxiliary machine of the alkali is effectively reduced, energy consumption is reduced, and the purity of the gas is improved. And due to the principle of gas flotation, the gas drives the liquid to rise, increasing the circulation volume inside the bipolar plate, increasing the alkali flow rate, and making it easier for the gas to escape. There is no need for a separate gas-liquid separation tank, which reduces the floor space and the cost of auxiliary machines. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the overall structure of the bipolar plate of the present invention; Figure 2 It is a schematic diagram of the matching structure of the pole frame and the gas-liquid separation box of the present invention; Figure 3 It is a schematic diagram of the front structure of the gas-liquid separation box of the present invention; Figure 4 It is a schematic diagram of the back structure of the gas-liquid separation box of the present invention; Figure 5 It is a schematic diagram of the gas-liquid separation flow of the present invention; Figure 6 It is a schematic diagram of the cross-sectional structure of the pole frame and the gas-liquid separation box of the present invention; Figure 7 It is an exploded schematic diagram of the connection structure of the bipolar plate, cathode assembly and anode assembly of the present invention; Figure 8 It is a schematic diagram of the electrolytic cell structure of the present invention; Fig. 9 It is a schematic diagram of the connection between the electrolytic cell and the auxiliary machine of the present invention; Fig.10 It is a schematic cross-sectional view of the three-way structure of the present invention.

[0022] In the figure: 1, pole frame; 2, partition; 3, alkali liquid 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 air inlet cavity; 9, rear separation cavity; 10, mesh; 11, air inlet hole; 12, air outlet hole; 13, ventilation groove; 14, reflux groove; 15, bending edge; 16, outer shell; 17, fixed edge strip; 18, positioning groove; 19, cathode assembly; 20, anode assembly; 21, integrated gas-liquid separation bipolar plate; 22, bracket; 23, alkali liquid pipeline; 2 4. First air outlet pipe; 25. Second air outlet pipe; 26. Alkaline water tank; 27. First three-way pipe; 28. First demister tank; 29. ​​Heat exchanger; 30. Second three-way pipe; 31. Second demister 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 bar; 113. Cathode bottom net; 114. Buffer net; 115. Cathode woven net; 116. Anode conductive elliptical tube; 117. Anode net. DETAILED DESCRIPTION

[0023] The present invention is 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 implement it, but the embodiments are not intended to limit the present invention.

[0024] Reference Figures 1 to 6 As shown, an embodiment of the integrated gas-liquid separation bipolar plate of the present invention includes a pole frame 1 and a partition plate 2 arranged in the pole frame, an alkali liquid flow channel hole 3 is arranged at the bottom of the pole frame, a first gas flow channel hole 4 and a second gas flow channel hole 5 are arranged at the top, a gas-liquid separation box 6 is arranged at the connection between the top of the partition plate and the pole frame, a partition plate 7 is arranged in the gas-liquid separation box, the partition plate divides the gas-liquid separation box into a front air inlet chamber 8 and a rear separation chamber 9, a mesh 10 is arranged on the upper part of the partition plate, an air inlet hole 11 is arranged at the bottom of the front air inlet chamber, an air outlet hole 12 is arranged at the top of the rear separation chamber, a ventilation groove 13 is arranged on the pole frame between the air outlet hole and the corresponding first gas flow channel hole or the second gas flow channel hole, and a reflux groove 14 is arranged on both side surfaces of the pole frame, the top of the reflux groove is through-connected with one side of the bottom of the rear separation chamber, and the bottom of the reflux groove is through-connected with the inner side of the pole frame below the gas-liquid separation box.

[0025] During the use of the integrated gas-liquid separation bipolar plate, the reflux groove and the vent groove are sealed on the surface by gaskets to form a flow channel. Figure 7 As shown, a cathode assembly 19 and an anode assembly 20 are respectively arranged on the surfaces of both sides 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 they cooperate to form a cathode side alkaline liquid cavity, the cathode assembly includes a cathode bottom mesh 113, a buffer mesh 114 and a cathode woven mesh 115, an anode conductive elliptical tube 116 is arranged between the anode assembly and the partition, and they cooperate to form an anode side alkaline liquid cavity, and the anode assembly includes an anode mesh 117. After being placed in the electrolytic cell, hydrogen and oxygen are electrolyzed in the alkaline liquid chamber formed between the partition and the adjacent cathode assembly and anode assembly. Taking hydrogen as an example, hydroxyl ions react with hydrogen on the cathode woven mesh to produce hydrogen. Due to the principle of gas flotation and the surface tension of the liquid, hydrogen floats up in the form of bubbles. During the flotation, the hydrogen bubbles collide with the alkaline liquid, which will push part of the alkaline liquid to move upward. The hydrogen bubbles and part of the alkaline liquid enter the front air inlet chamber in the gas-liquid separation box through the air inlet hole, and continue to move upward from the front air inlet chamber, passing through the mesh on the dividing plate. After the hydrogen bubbles pass through the mesh with the defoaming function, the hydrogen bubbles will be broken into hydrogen gas and alkaline liquid and enter the rear separation chamber. The hydrogen gas and a small amount of alkaline liquid enter the first gas flow channel hole through the ventilation groove and are finally drained out. The alkaline liquid pushed by the hydrogen bubbles and the bubbles break the alkaline liquid, enter the bottom of the rear separation chamber due to gravity, and can enter the bottom of the pole frame along the reflux grooves on both sides of the pole frame to participate in the next hydrogen evolution reaction, and this cycle is repeated.

[0026] Therefore, during the whole process, the gas-liquid separation box can effectively intercept most of the alkali liquid brought into the gas flow channel by the rising gas, so that only gas and a small amount of alkali liquid enter the gas flow channel, and the resistance in the flow channel increases. According to Ohm's law, the leakage current is reduced, the hydrogen and oxygen evolution reactions in the flow channel are weakened, and the gas purity is improved. In addition, the alkali liquid after being intercepted and separated can also flow back into the alkali liquid chamber, and the reflux position can be on the bottom side of the alkali liquid chamber, which can increase the alkali liquid flow rate inside the bipolar plate and make it easier for bubbles to escape, thereby reducing energy consumption.

[0027] The bottom of the above-mentioned partition plate is provided with a bent edge 15, which is sealed and connected to the surface of the partition plate. The partition plate and the partition plate cooperate to form a rear separation cavity. The side edge of the partition plate is sealed and connected to the inner wall of the pole frame, which can be fixed by welding. The gas-liquid separation box includes an outer shell 16, which is covered on the partition plate and sealed and fixed, which can be fixed by welding. The partition plate surface, the inner wall of the outer shell and the partition plate cooperate to form a front air intake cavity and a rear separation cavity. Through the cooperation of the partition plate and the outer shell, a cavity is effectively formed on the surface of the partition plate, which can greatly reduce the thickness of the gas-liquid separation box.

[0028] The upper part of the partition plate corresponding to the mesh is arranged in an inclined shape and abuts against the inner wall of the outer shell. The abutting part can be welded and connected as a whole to ensure the strength of the overall structure. The inclined part can increase the contact surface with the gas, thereby better intercepting the alkali solution. In the outer shell fixing structure, a fixed edge strip 17 can be arranged on the outer periphery of the outer shell, and a positioning groove 18 is arranged on the pole frame corresponding to the fixed edge strip. The fixed 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.

[0029] Reference Figure 8 As shown, the present application also discloses an electrolytic cell 111, including the above-mentioned integrated gas-liquid separation bipolar plate 21, so that the alkali liquid can be effectively reused in the electrolytic cell. The electrolytic cell also includes a bracket 22, and the integrated gas-liquid separation bipolar plate is arranged in the bracket. The bracket is provided with an alkali liquid pipeline 23, a first gas outlet pipeline 24 and a second gas outlet pipeline 25 connected to the integrated gas-liquid separation bipolar plate. The alkali liquid pipeline is used to provide alkali liquid and enter the alkali liquid chamber from the alkali liquid flow channel hole of the integrated gas-liquid separation bipolar plate. The first gas outlet pipeline and the second gas outlet pipeline are used to discharge oxygen and hydrogen respectively.

[0030] Reference Fig. 9As shown, for the discharged gas, since there is still a small amount of alkali liquid in the gas, it is necessary to effectively separate and process the gas. Compared with the existing gas-liquid separation tank, the alkali liquid is pre-retained in the electrolytic cell in the present application, so there is no need to use a large-volume gas-liquid separation tank. Specifically, the auxiliary machine structure of the electrolytic cell is as follows: the alkali liquid pipeline is connected to the alkaline water tank 26, the first gas outlet pipeline is connected to the gas inlet end of the first tee 27, and the gas outlet end and the liquid outlet end of the first tee are respectively connected to The first demister 28 is connected to the heat exchanger 29, the second air outlet pipe is connected to the air inlet end of the second tee 30, the air outlet end and the liquid outlet end of the second tee are respectively connected to the second demister 31 and the heat exchanger, the heat exchanger is connected to the alkali solution pipeline through the shielded pump 32, the first demister, the second demister and the heat exchanger are all connected to the cooling water inlet and outlet pipes, the first demister and the second demister are also connected to the deionized water tank 33, the deionized water tank supplies pure water for the first demister and the second demister during the washing process.

[0031] Specifically, the three-way structure is as follows: Fig.10 As shown, a separation space 34 is provided inside the first tee and the second tee, an air inlet 35 is provided on the side of the middle of the separation space, a liquid outlet 36 is provided at the bottom of the separation space, and an air outlet 37 is provided at the top of the separation space. During operation, gas containing a small amount of alkali liquid enters the separation space from the air inlet, and the alkali liquid falls back to the bottom of the separation space due to its weight, while the gas continues to be discharged from the air outlet at the top of the separation space, and the accumulated alkali liquid is discharged from the liquid outlet below the air inlet on the side, and the liquid discharge power is formed here by the liquid pumping function of the shielded pump.

[0032] The present application also discloses a hydrogen production method. When in use, 30% KOH is loaded in an alkaline water tank and enters the alkaline solution pipeline of the electrolyzer under the action of a shielded pump. After the startup conditions are met, power is turned on in stages according to the process requirements.

[0033] After the electrolyzer is powered on, hydrogen and oxygen are generated. Hydrogen and oxygen are discharged from the first outlet pipe and the second outlet pipe after passing through the corresponding gas-liquid separation box. After being discharged, hydrogen gas and a small amount of alkali liquid first pass through the corresponding first tee and second tee. The volume of the tee pipe is slightly larger than that of the existing tee structure. Under the action of gravity, hydrogen gas goes up into the hydrogen demister tank, and oxygen goes up into the oxygen demister tank, i.e., the first demister tank and the second demister tank, and enters the purification system after demisting and washing. The alkali liquid in the first tee and the second tee can be cooled from the other side along the pipeline and through the heat exchanger. At the same time, the washed liquid in the first demister tank and the second demister tank also flows into the heat exchanger for cooling. The liquid includes pure water, impurities washed, and part of the alkali liquid mixed in the liquid. Finally, it flows back to the electrolyzer under the action of the shielded pump. A filter is also provided in front of the shielded pump to filter impurities and other substances in the heat exchanger.

[0034] The setting of the three-way connection can effectively retain a small amount of alkali liquid contained in the gas, so there is no need to use a gas-liquid separation tank, which effectively reduces the equipment footprint and use costs.

[0035] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or change made by a person skilled in the art based on the present invention is within the protection scope of the present invention.

Claims

1. An integrated gas-liquid separation bipolar plate, characterized in that: It includes a pole frame and a partition arranged in the pole frame, the pole frame is provided with an alkali liquid flow channel hole at the bottom, and a first gas flow channel hole and a second gas flow channel hole at the top, a gas-liquid separation box is provided at the connection between the top of the partition and the pole frame, a partition plate is provided in the gas-liquid separation box, the partition plate divides the gas-liquid separation box into a front air inlet chamber and a rear separation chamber, a mesh is provided on the upper part of the partition plate, an air inlet hole is provided at the bottom of the front air inlet chamber, an air outlet hole is provided at the top of the rear separation chamber, a ventilation groove is provided on the pole frame between the air outlet hole and the corresponding first gas flow channel hole or the second gas flow channel hole, a reflux groove is provided on both side surfaces of the pole frame, the top of the reflux groove is through-connected with one side of the bottom of the rear separation chamber, and the bottom of the reflux groove is through-connected with the inner side of the pole frame below the gas-liquid separation box.

2. The integrated gas-liquid separation bipolar plate according to claim 1, characterized in that: The bottom of the partition plate is provided with a bent edge, the bent edge is sealed and connected to the surface of the partition plate, the partition plate and the partition plate cooperate to form a rear separation cavity, and the side edge of the partition plate is sealed and connected to the inner wall of the pole frame.

3. The integrated gas-liquid separation bipolar plate according to claim 1, characterized in that: The gas-liquid separation box comprises an outer shell, which is covered on a partition plate and sealed and fixed thereto; the partition plate surface, the inner wall of the outer shell and the partition plate cooperate to form a front air inlet cavity and a rear separation cavity.

4. The integrated gas-liquid separation bipolar plate according to claim 3, characterized in that: The upper part of the dividing plate corresponding to the mesh is arranged in an inclined shape and abuts against the inner wall of the outer shell.

5. The integrated gas-liquid separation bipolar plate according to claim 3, characterized in that: A fixed edge strip is arranged on the outer periphery of the housing, a positioning groove is arranged on the pole frame corresponding to the fixed edge strip, and the fixed edge strip is arranged in the positioning groove and sealed and fixed.

6. The integrated gas-liquid separation bipolar plate according to claim 1, characterized in that: A cathode assembly and an anode assembly are respectively arranged on the two side surfaces of the partition below the gas-liquid separation box, a cathode conductive support bar is arranged between the cathode assembly and the partition to form a cathode side alkali liquid cavity, and an anode conductive elliptical tube is arranged between the anode assembly and the partition to form an anode side alkali liquid cavity.

7. An electrolytic cell, characterized in that: An integrated gas-liquid separation bipolar plate comprising any one of claims 1-6.

8. The electrolytic cell according to claim 7, characterized in that It also includes a bracket, the integrated gas-liquid separation bipolar plate is arranged in the bracket, and the bracket is provided with an alkaline liquid pipeline, a first gas outlet pipeline and a second gas outlet pipeline connected to the integrated gas-liquid separation bipolar plate.

9. The electrolytic cell according to claim 8, characterized in that The alkali liquid pipeline is connected to the alkali water tank, the first air outlet pipeline is connected to the air inlet end of the first tee, the air outlet end and the liquid outlet end of the first tee are respectively connected to the first demister tank and the heat exchanger, the second air outlet pipeline is connected to the air inlet end of the second tee, the air outlet end and the liquid outlet end of the second tee are respectively connected to the second demister tank and the heat exchanger, the heat exchanger is connected to the alkali liquid pipeline through a shielded pump, the first demister tank, the second demister tank and the heat exchanger are all connected to the cooling water inlet and outlet pipelines, and the first demister tank and the second demister tank are also connected to the deionized water tank; A separation space is provided inside the first tee and the second tee, an air inlet is provided on the side of the middle of the separation space, a liquid outlet is provided at the bottom of the separation space, and an air outlet is provided at the top of the separation space.

10. A method for producing hydrogen, characterized in that: Using the electrolytic cell as claimed in claim 9, comprising the following steps: Step 1) First, add 30% KOH into the alkaline water tank, and use the shielded pump to send the alkaline solution in the alkaline water tank into the electrolytic cell through the pipeline. After the startup conditions are met, the electrolytic cell is powered on in stages according to the process requirements; Step 2) After the electrolytic cell is powered on, gas is generated. The gas is hydrogen and oxygen. Due to the principle of gas flotation and the surface tension of the liquid, hydrogen and oxygen float up in the form of bubbles. During the floating process, the bubbles collide with the alkali solution, which pushes part of the alkali solution upward and enters the corresponding gas-liquid separation box. The gas-liquid separation box breaks the bubbles, and the gas carries a small amount of alkali solution into 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 solution after the bubbles are broken flows back from the reflux tank to the corresponding alkali solution cavity; Step 3) The hydrogen and oxygen discharged from the first gas outlet pipe and the second gas outlet pipe are separated into gas and liquid in the separation space provided inside the first tee and the second tee, and the separated gas enters the corresponding first and second demisters for demisting and washing and enters the subsequent purification system for re-entry, and the separated alkali liquid enters the heat exchanger for cooling; Step 4) The cooled alkali solution flows back into the electrolytic cell through a shielded pump.

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