Alkaline water electrolysis hydrogen production electrolyzer and water electrolysis system

Abstract

The utility model relates to a kind of hydrogen production electrolytic cell and electrolytic water system of alkaline electrolytic water, comprising: electrolytic cell mechanism, it includes: integrated tank body, cover and baffle assembly, the integrated tank body, cover and baffle assembly are enclosed to form cathode space and anode space respectively, the cover is opened with multiple through holes respectively connected in cathode space and anode space, the baffle assembly is detachably set in integrated tank body;Adjusting mechanism is respectively set in integrated tank body both sides and respectively corresponds to cathode space and anode space.The utility model is set above, integrated tank body design avoids the risk of electrolytic cell leakage caused by the gasket of traditional electrolytic cell, diaphragm replacement time is shortened from traditional 2 hours to less than 2 minutes, improves electrode and diaphragm and other parts test rate, can make cathode and anode zero electrode spacing, improves electrolytic efficiency and stability.

Description

Technical Field

[0001] This utility model relates to the field of electrolysis technology, and in particular to an alkaline water electrolysis hydrogen production electrolysis cell and water electrolysis system. Background Technology

[0002] Hydrogen, as a fuel, boasts advantages such as concentrated flame, high calorific value, and high efficiency. Furthermore, it can be combined with other energy sources for more efficient energy utilization. Produced from water, its combustion products are reduced back to water, resulting in no environmental pollution throughout the process. Therefore, hydrogen energy is an exceptionally superior secondary energy source and one of the cleanest and most efficient new energy sources of the 21st century. Currently, the technology of producing hydrogen through water electrolysis using electrolysis equipment has received widespread attention and recognition. The electrolyzer, as the core component and main equipment of a hydrogen generator, has a crucial impact on the performance of hydrogen production technology due to its optimized structural design. An electrolyzer consists of an integrated tank, an anode, and a cathode, with most systems using a diaphragm to separate the anode and cathode chambers.

[0003] Currently, when some parts of electrolysis equipment, especially electrolytic cells, are damaged, the entire electrolytic cell needs to be transported to the manufacturer for repair. During the repair process, the entire electrolytic cell needs to be disassembled, which is troublesome and not only increases operating costs but also reduces work efficiency during the replacement period. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the problem that in the prior art, the entire electrolyzer needs to be disassembled for maintenance, which leads to troublesome disassembly and assembly, increases operating costs, and reduces work efficiency during replacement. Thus, an alkaline water electrolysis hydrogen production electrolyzer and water electrolysis system are provided.

[0005] To solve the above-mentioned technical problems, this utility model provides an alkaline water electrolysis hydrogen production electrolyzer, comprising:

[0006] An electrolytic cell mechanism includes: an integrated cell body, a cover body, and a partition assembly. The integrated cell body, the cover body, and the partition assembly respectively enclose a cathode space and an anode space. The cover body has multiple through holes that communicate with the cathode space and the anode space respectively. The partition assembly is detachably mounted on the integrated cell body.

[0007] The partition assembly includes a first plate, a second plate, and a diaphragm, wherein the diaphragm is detachably disposed between the first plate and the second plate;

[0008] The adjustment mechanism is respectively disposed on both sides of the integrated tank and corresponding to the cathode space and the anode space. It includes: a bracket, a threaded sleeve, a threaded rod, and an electrode plate. The bracket is disposed in the integrated tank, the threaded sleeve is disposed between the integrated tank and the bracket, the threaded rod passes through the threaded sleeve and extends to the anode space or the cathode space, and the electrode plate is driven to be connected to the threaded rod and is movably disposed in the anode space or the cathode space.

[0009] In one embodiment of the present invention, the first plate includes: a base plate, a limiting plate, and a connecting plate. The limiting plate is connected to the periphery of the base plate through the connecting plate. An accommodating space is formed between the limiting plate and the base plate. An accommodating opening communicating with the accommodating space is provided on one side of the base plate. A first channel window is provided on the base plate.

[0010] In one embodiment of the present invention, the size of the second plate is adapted to the accommodating space and the accommodating opening, and the second plate is provided with a second channel window corresponding to the first channel window.

[0011] In one embodiment of the present invention, a pressure groove is provided on the side of the second plate away from the receiving port, and the size of the pressure groove is adapted to the diaphragm to be assembled.

[0012] In one embodiment of this utility model, a stress groove is provided between the ends of adjacent limiting plates, and the thickness of the accommodating space is less than the thickness of the second plate.

[0013] In one embodiment of this utility model, the end of the threaded rod is threaded with a bearing, the bearing is connected to a chuck, and the electrode plate is connected to the chuck.

[0014] In one embodiment of this utility model, the outer ring of the bearing is fixedly connected to the pawl, and the inner ring of the bearing is threadedly connected to the end of the threaded rod.

[0015] In one embodiment of the present invention, one end of the threaded sleeve is sealed and embedded in the integrated groove, and the other end of the threaded sleeve is connected to the bracket.

[0016] In one embodiment of the present invention, the integrated groove has a guide groove adapted to the first plate in the height direction, the integrated groove has a stepped surface on the side near the cover, and the cover has a protrusion adapted to the stepped surface.

[0017] This utility model also provides an alkaline water electrolysis system, including the alkaline water electrolysis hydrogen production electrolysis cell described above.

[0018] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial effects:

[0019] The alkaline water electrolysis for hydrogen production described in this utility model has the following advantages: (1) The integrated design of the tank body avoids the risk of leakage caused by the use of gaskets in traditional electrolysis tanks; (2) The disassembly time of the electrolysis tank is shortened from the traditional 2 hours to less than 2 minutes, improving the testing rate of components such as electrodes and diaphragms; (3) It can adjust the distance between the anode and cathode to the zero electrode, improving the electrolysis efficiency and stability. Specifically, through the detachable diaphragm mechanism, and in conjunction with the second plate and the first plate to detachably clamp the diaphragm, the diaphragm replacement time is shortened from the traditional 2 hours to less than 2 minutes, avoiding efficiency loss caused by downtime. It is resistant to high temperature and corrosion, and the electrode distance can be adjusted arbitrarily, improving the stability of electrolysis efficiency. Attached Figure Description

[0020] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the structure of the electrolytic cell of this utility model;

[0022] Figure 2 This is a structural schematic diagram of the partition assembly of this utility model;

[0023] Figure 3 This is a structural schematic diagram of the cover and integrated groove of this utility model.

[0024] Explanation of reference numerals in the accompanying drawings: 1. Integrated tank; 2. Bracket; 3. Threaded rod; 4. Threaded sleeve; 5. Guide groove; 6. Partition assembly; 61. First plate; 611. Stress groove; 612. Base plate; 613. Connecting plate; 614. Limiting plate; 615. First channel window; 62. Second plate; 63. Second channel window; 64. Pressure groove; 7. Bearing; 8. Claw; 9. Electrode plate; 10. Cover; 11. Protrusion; 12. Through hole; 13. Stepped surface. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0026] Example

[0027] Reference Figures 1-3 As shown, the present invention provides an alkaline water electrolysis electrolyzer for hydrogen production, comprising:

[0028] An electrolytic cell mechanism includes: an integrated cell body 1, a cover 10, and a partition assembly 6. The integrated cell body 1, the cover 10, and the partition assembly 6 respectively enclose a cathode space and an anode space. The cover 10 has a plurality of through holes 12 that are respectively connected to the cathode space and the anode space. The partition assembly 6 is detachably disposed on the integrated cell body 1.

[0029] The partition assembly 6 includes a first plate 61, a second plate 62, and a diaphragm, wherein the diaphragm is detachably disposed between the first plate 61 and the second plate 62.

[0030] The adjustment mechanism is respectively set on both sides of the integrated tank 1 and corresponds to the cathode space and the anode space respectively. It includes: a bracket 2, a threaded sleeve 4, a threaded rod 3, and an electrode plate 9. The bracket 2 is set in the integrated tank 1, the threaded sleeve 4 is set between the integrated tank 1 and the bracket 2, the threaded rod 3 passes through the threaded sleeve 4 and extends to the anode space or the cathode space, and the electrode plate 9 is driven to be connected to the threaded rod 3 and is movably set in the anode space or the cathode space.

[0031] The alkaline water electrolysis hydrogen production electrolyzer described in this utility model has an integrated tank body 1 that is a corrosion-resistant cavity structure. Specifically, the integrated tank body 1 and the top cover of the electrolyzer are made of polytetrafluoroethylene (PTFE) material for the following reasons: 1. Resistance to strong alkali corrosion: Excellent stability in 30% KOH solution (80–90°C), avoiding electrochemical corrosion of metal materials; 2. Insulation: Blocks current leakage between the electrode plates 9, improving current efficiency; 3. High temperature adaptability: Long-term tolerance to temperatures up to 250°C, covering alkaline water electrolysis conditions (usually <90°C).

[0032] The integrated tank 1 has a top-opening chamber to reduce solution flow resistance and corrosion risk. The volume of the integrated tank 1 matches the area of ​​the electrode plate 9 and the electrolysis power to ensure that the electrolyte solution can fully cover the electrode plate 9 and the diaphragm. The cover 10 is a flat plate structure adapted to the opening of the integrated tank 1, and a rubber sealing ring is provided at the connection to improve the sealing. The cover 10 has two sets of through holes 12: one set connects to the cathode space for hydrogen exhaust; the other set connects to the anode space (diameter same as the cathode side) for oxygen exhaust. The remaining through holes 12 can be used for electrolyte injection and connection of the electrode plate 9 through wires. The diaphragm assembly 6, as the separator between the anode and cathode spaces, adopts a detachable design to simplify maintenance. It consists of a first plate 61, a second plate 62, and a diaphragm. Among them, the first plate 61 and the second plate 62 are insulating and corrosion-resistant support components, such as polytetrafluoroethylene; the diaphragm is an ion exchange membrane to ensure charge balance. The diaphragm adopts PPS (polyphenylene sulfide) based composite membrane, with the following functional characteristics: alkali resistance, low swelling rate (<5%), and a thickness of 0.8 mm.

[0033] The adjustment mechanism can precisely adjust and reduce the distance between the electrode plate 9 and the diaphragm to balance ion transport resistance and short-circuit risk. The support 2 is bolted to the outer wall of the integrated tank 1, providing rigid support for the adjustment mechanism and preventing the threaded rod 3 from dislodging during adjustment. The threaded sleeve 4 is a cylindrical guide, made of stainless steel or PTFE, with threads machined into its inner hole, used to cooperate with the threaded rod 3 to achieve rotation and axial movement conversion. One end of the threaded sleeve 4 is welded to the support 2, and the other end is embedded in the through hole 12 in the side wall of the integrated tank 1. A sealing ring is installed at the embedding point to achieve a seal, thereby preventing solution leakage.

[0034] The outer surface of the threaded rod 3 is machined with threads that match the threaded sleeve 4. One end extends into the interior of the integrated groove 1, and its length covers the adjustment stroke of the electrode plate 9. The other end is equipped with a handwheel or motor interface for easy manual or automatic adjustment.

[0035] The electrode plate 9 is a pure nickel metal plate, and its size is adapted to the space between the anode and cathode (e.g., 200mm×200mm×2mm). The electrode plate 9 is connected to the end of the threaded rod 3 through a drive structure and can move axially along the integrated tank 1. Its surface needs to be sandblasted to enhance the adhesion of the catalyst layer.

[0036] A diaphragm is placed between the first plate 61 and the second plate 62 to form a diaphragm assembly 6. The diaphragm assembly 6 is installed in the integrated tank 1 to separate the anode and cathode spaces. Electrolyte solution is injected into the integrated tank 1 until the liquid level is higher than the plates. The cover 10 is closed and fixed, and a gas collection pipe is connected through the through hole 12 on the cover 10. The zero-gap contact between the plates 9 and the diaphragm is adjusted by rotating the threaded rod 3. A DC voltage is applied to the plates 9, with the cathode connected to the negative electrode and the anode connected to the positive electrode. OH⁻ ions in the electrolyte solution move towards the anode through the diaphragm. H₂O molecules gain electrons at the cathode to generate hydrogen gas (2H₂O + 2e⁻ → H₂↑ + 2OH⁻), and OH⁻ ions lose electrons at the anode to generate oxygen gas (4OH⁻ → 2H₂O + O₂↑ + 4e⁻). Hydrogen and oxygen gas enter the external collection system through the through hole 12 of the cover 10, respectively. When the electrolysis voltage is too high, it indicates that the distance between the electrode plate 9 and the diaphragm is too large or the diaphragm is aging. At this time, rotate the threaded rod 3 to make the electrode plate 9 come into contact with the diaphragm.

[0037] The first plate 61 includes a base plate 612, a limiting plate 614, and a connecting plate 613. The limiting plate 614 is connected to the periphery of the base plate 612 via the connecting plate 613. A receiving space is formed between the limiting plate 614 and the base plate 612. A receiving opening communicating with the receiving space is provided on one side of the base plate 612. The base plate 612 has a first channel window 615. The second plate 62 is sized to fit the receiving space and the receiving opening. The second plate 62 has a second channel window 63 corresponding to the first channel window 615.

[0038] The strip structure of the limiting plate 614 restricts the radial displacement of the second plate 62, ensuring that the relative position of the second plate 62 and the base plate 612 is fixed after insertion, preventing the diaphragm from shifting due to the shaking of the second plate 62. The connecting plate 613 transmits the supporting force of the limiting plate 614 to the base plate 612. The side insertion design of the receiving port allows the second plate 62 to be installed or removed without disassembling the entire diaphragm assembly 6. When replacing the diaphragm, simply pull out the second plate 62 from the receiving port to remove or insert the diaphragm. The first channel window 615 and the second channel window 63 form a continuous ion transport path, allowing OH⁻ ions in the electrolyte solution to pass through the diaphragm and directly enter the space on the other side.

[0039] The second plate 62 has a pressure groove 64 on the side away from the receiving opening. The size of the pressure groove 64 is adapted to the diaphragm to be assembled. The diaphragm is laid flat in the pressure groove 64 of the second plate 62, with the edge of the diaphragm adhering to the side wall of the pressure groove 64, achieving initial positioning. The second plate 62 is then horizontally inserted into the receiving space of the first plate 61 from the receiving opening. At this time, the other surface of the diaphragm contacts the bottom plate 612 of the first plate 61. Since the depth of the pressure groove 64 is slightly less than the thickness of the diaphragm, the diaphragm is slightly compressed when the first plate 61 and the second plate 62 are engaged, forming an elastic seal. This prevents the diaphragm from slipping off the second plate 62 during the assembly process.

[0040] A stress groove 611 is provided between the ends of adjacent limiting plates 614, and the thickness of the accommodating space is less than the thickness of the second plate 62. When the second plate 62 is inserted into the accommodating space, the top of the second plate 62 will slightly exceed the top of the limiting plate 614. At this time, the top of the limiting plate 614 will undergo elastic deformation due to compression, applying an elastic clamping force to the second plate 62. The stress groove 611 releases the stress of the limiting plate 614, increases the deformation space of the limiting plate 614, and prevents cracking.

[0041] The threaded end sleeve 4 of the threaded rod 3 is connected to a bearing 7, and the bearing 7 is connected to a chuck 8. The electrode plate 9 is connected to the chuck 8. The outer ring of the bearing 7 is fixedly connected to the chuck 8, and the inner ring of the bearing 7 is threadedly connected to the end of the threaded rod 3. The electrode plate 9 is detachably connected by snap-fit, threaded connection, or insertion. Its inner ring is fixed to the end of the threaded rod 3 by threads. The axial length of the inner ring of the bearing 7 is greater than that of the outer ring, which facilitates the direct application of torsional force to the inner ring for rotation, thereby allowing the bearing 7 to be installed and removed. The electrode plate 9 is a rectangular pure nickel metal plate. The axial force of the threaded rod 3 is transmitted to the balls through the inner ring of the bearing 7, and then to the outer ring. The outer ring drives the chuck 8 and the electrode plate 9 to move axially, while the outer ring itself does not rotate. Because the chuck 8 is connected to the electrode plate 9, the electrode plate 9 is confined within the anode and cathode space and will not rotate.

[0042] One end of the threaded sleeve 4 is sealed and embedded in the integrated groove 1, and the other end of the threaded sleeve 4 is connected to the bracket 2. A sealing ring groove is machined at one end of the threaded sleeve 4, housing a nitrile rubber sealing ring. A through hole 12 matching the outer diameter of the threaded sleeve 4 is opened on the side wall of the integrated groove 1. The sealing ring end of the threaded sleeve 4 is embedded in the through hole 12, achieving radial sealing through the sealing ring. The fixed connection between the threaded sleeve 4 and the bracket 2 provides two-point support for the threaded rod 3. The two ends of the threaded sleeve 4 are respectively connected to the integrated groove 1 and the bracket 2, preventing the threaded rod 3 from tilting during rotation.

[0043] The integrated tank 1 has a guide groove 5 in its height direction that fits the first plate 61. The integrated tank 1 has a stepped surface 13 on the side near the cover 10, and the cover 10 has a protrusion 11 that fits the stepped surface 13. The guide groove 5 is located on the inner wall of the integrated tank 1, extending from the bottom to the top of the integrated tank 1 along its height direction. It is a rectangular groove. The guide groove 5 must be aligned with the edge of the first plate 61. When installing the partition assembly 6, the edge of the first plate 61 is inserted into the guide groove 5, and the partition assembly 6 is accurately installed to the bottom of the integrated tank 1 by sliding it downwards along the guide groove 5.

[0044] The stepped surface 13 is formed at the top opening edge of the integrated groove 1. It is an L-shaped concave surface with a smooth finish to ensure a sealing effect. The protruding part 11 is set at the bottom edge of the cover 10 and is an L-shaped convex surface that matches the stepped surface 13. When the cover 10 is installed, the protruding part 11 is embedded in the stepped surface 13 to form a labyrinth seal.

[0045] This embodiment also provides an alkaline water electrolysis system, including the alkaline water electrolysis hydrogen production electrolyzer described above. It further includes: a power supply system: a DC switching power supply with constant voltage / constant current mode switching function, which can automatically adjust the output according to the electrolysis state; a solution circulation system: including a solution storage tank, a circulation pump, and a filter, used to replenish the water consumed during the electrolysis process. After water decomposition, the solution concentration increases, requiring the addition of deionized water to maintain a stable concentration; and a cooling system: including a cooling water tank and a serpentine cooling pipe, which uses circulating cooling water to remove the heat generated by the electrolysis reaction.

[0046] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. An alkaline water electrolysis electrolysis cell for hydrogen production, characterized in that, include: An electrolytic cell mechanism includes: an integrated cell body, a cover body, and a partition assembly. The integrated cell body, the cover body, and the partition assembly respectively enclose a cathode space and an anode space. The cover body has multiple through holes that communicate with the cathode space and the anode space respectively. The partition assembly is detachably mounted on the integrated cell body. The partition assembly includes a first plate, a second plate, and a diaphragm, wherein the diaphragm is detachably disposed between the first plate and the second plate; The adjustment mechanism is respectively disposed on both sides of the integrated tank and corresponding to the cathode space and the anode space. It includes: a bracket, a threaded sleeve, a threaded rod, and an electrode plate. The bracket is disposed in the integrated tank, the threaded sleeve is disposed between the integrated tank and the bracket, the threaded rod passes through the threaded sleeve and extends to the anode space or the cathode space, and the electrode plate is driven to be connected to the threaded rod and is movably disposed in the anode space or the cathode space.

2. The alkaline water electrolysis hydrogen production electrolyzer according to claim 1, characterized in that: The first plate includes a base plate, a limiting plate, and a connecting plate. The limiting plate is connected to the periphery of the base plate through the connecting plate. An accommodating space is formed between the limiting plate and the base plate. An accommodating opening communicating with the accommodating space is provided on one side of the base plate. A first channel window is provided on the base plate.

3. The alkaline water electrolysis hydrogen production electrolyzer according to claim 1, characterized in that: The second plate is sized to accommodate the space and opening, and the second plate has a second channel window corresponding to the first channel window.

4. The alkaline water electrolysis hydrogen production electrolyzer according to claim 1, characterized in that: The second plate has a pressure groove on the side away from the receiving port, and the size of the pressure groove is adapted to the diaphragm to be assembled.

5. The alkaline water electrolysis hydrogen production electrolyzer according to claim 2, characterized in that: A stress groove is provided between the ends of adjacent limiting plates, and the thickness of the accommodating space is less than the thickness of the second plate.

6. The alkaline water electrolysis hydrogen production electrolyzer according to claim 1, characterized in that: The end of the threaded rod is threaded with a bearing, the bearing is connected to a chuck, and the electrode plate is connected to the chuck.

7. The alkaline water electrolysis hydrogen production electrolyzer according to claim 6, characterized in that: The outer ring of the bearing is fixedly connected to the jaws, and the inner ring of the bearing is threadedly connected to the end of the threaded rod.

8. The alkaline water electrolysis hydrogen production electrolyzer according to claim 1, characterized in that: One end of the threaded sleeve is sealed and embedded in the integrated groove, and the other end of the threaded sleeve is connected to the bracket.

9. An alkaline water electrolysis cell for hydrogen production according to claim 1, characterized in that: The integrated tank has a guide groove in its height direction that is adapted to the first plate. The integrated tank has a stepped surface on the side near the cover. The cover has a protrusion adapted to the stepped surface.

10. An alkaline water electrolysis system, characterized in that, This includes an alkaline water electrolysis electrolyzer for hydrogen production as described in any one of claims 1-9.

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