Monopolar electrolytic cell membrane polar distance transformation structure and transformation method

Abstract

The invention discloses a monopolar electrolytic cell membrane polar distance transformation structure and transformation method, and relates to the technical field of electrolysis equipment, the monopolar electrolytic cell membrane polar distance transformation structure comprises a plurality of groups of cathodes, ionic membranes and anodes which are arranged in a staggered manner; the anode comprises an anode frame, a plurality of anode rib plates and a pair of anode bottom nets, the anode rib plates are strip-shaped and are fixedly arranged in the anode frame, the plurality of anode rib plates are longitudinally and uniformly distributed, a plurality of round holes are formed in the anode rib plates, and the pair of anode bottom nets are fixedly arranged on the two sides of the anode rib plates; according to the invention, the cathode is bound and fixed by adopting the soft PTFE wire, the peripheral edge of the active net is folded inwards, the binding point is specially pressed to be lower than the plane of the active net, and the bottom of the bottom net is fastened, so that the purposes of convenient disassembly, repair and maintenance, avoidance of damage to the ionic membrane and stable and firm installation are achieved.

Description

Technical Field

[0001] This invention relates to the field of electrolysis equipment technology, specifically to a structure and method for modifying the membrane electrode spacing of a unipolar electrolyzer. Background Technology

[0002] As a core piece of equipment in the chlor-alkali industry, the performance of ion-exchange membrane electrolyzers directly affects energy consumption, product quality, and operating costs. To reduce cell voltage and save energy, membrane electrode spacing modification has become an important technological upgrade direction for the industry. This technology eliminates the buffer gap between the cathode mesh and the ion-exchange membrane, making them almost flush, forming a "zero-gap" or "membrane-electrode-gap" structure, thereby effectively reducing ohmic voltage drop.

[0003] In existing technologies, when modifying the membrane electrode distance in a unipolar electrolyzer, a common approach is to wrap an elastic mesh around the cathode active mesh, and then fix this assembly to the cathode bottom mesh by welding. For example, Chinese invention patent CN111155144B discloses a cathode and electrolyzer for a unipolar membrane electrolyzer, which employs this welding fixing method. While this method can achieve initial fixation of the cathode assembly, it has revealed the following significant drawbacks in long-term industrial operation: 1. During the operation of the electrolytic cell, a large amount of hydrogen gas is continuously generated in the cathode chamber. Under the intense scouring and disturbance of the fluids (including electrolyte and gas), the cathode mesh is in a state of continuous vibration. This long-term, high-frequency micro-vibration can easily lead to metal fatigue at the weld joints, resulting in weld cracking, incomplete welds, or breakage. Once the weld joint fails, the cathode active mesh or elastic mesh may locally shift, warp, or even detach. Its sharp metal edges or fractures can easily scratch or puncture the tightly attached ion membrane, causing costly ion membrane damage, leading to unplanned shutdowns and significant economic losses.

[0004] 2. Cathode modules (including active mesh and elastic mesh) are consumable parts and will need to be replaced after a certain period of operation due to activity decay, scaling, or physical damage. When using welding for fixing, disassembling the old module requires cutting, and installing the new module requires re-welding. This process is not only cumbersome and time-consuming, but the repeated local heating (welding) and cooling can also have a thermal impact on the cathode mesh substrate, potentially leading to substrate deformation or performance degradation. Furthermore, after multiple welding and disassembly, it is difficult to keep the weld points flat, and the superposition of old and new weld points can easily cause unevenness at the fixing points, affecting the uniform adhesion between the cathode module and the ion exchange membrane, and consequently affecting the current density distribution and electrolysis efficiency.

[0005] 3. Welding is a rigid connection, which is difficult to adapt to the thermal expansion, assembly stress changes, and slight deformation of the ion membrane itself that may occur during the operation of the electrolyzer. The lack of necessary flexible adjustment capabilities may exacerbate local stress under certain operating conditions, making it difficult to maintain uniform and flexible contact between the cathode assembly and the ion membrane.

[0006] Therefore, existing welding fixing methods have significant shortcomings in terms of long-term operational reliability, ease of maintenance, and protection of the core component, the ion exchange membrane. The industry urgently needs a new method for fixing cathode components that provides a strong and reliable connection, effectively buffers vibration, facilitates disassembly and replacement, and does not damage the ion exchange membrane, in order to improve the overall operational stability and economy of the membrane electrode distance electrolyzer. Summary of the Invention

[0007] To address the aforementioned shortcomings of existing technologies, this invention provides a modification structure and method for the interphase spacing of a unipolar electrolyzer membrane. This involves using flexible PTFE wire for binding and fixing, folding the edges of the active mesh inwards, intentionally pressing the binding points below the plane of the active mesh, and fastening the bottom of the bottom mesh. This achieves the goals of convenient disassembly and maintenance, avoiding damage to the ion exchange membrane, and ensuring stable and secure installation.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solution: a unipolar electrolytic cell membrane electrode spacing modification structure, comprising multiple sets of staggered cathodes, ion membranes and anodes; The anode includes an anode frame, multiple anode ribs, and a pair of anode bottom meshes. The anode ribs are strip-shaped and fixedly installed inside the anode frame. The multiple anode ribs are evenly distributed longitudinally and have multiple round holes. The pair of anode bottom meshes are fixedly installed on both sides of the anode ribs. The cathode includes a cathode frame, multiple cathode ribs, a pair of cathode bottom meshes, a pair of cathode elastic meshes, a pair of cathode active meshes, and PTFE wires. The cathode ribs are strip-shaped and fixedly installed inside the cathode frame. The multiple cathode ribs are evenly distributed longitudinally and have multiple round holes. The pair of cathode elastic meshes cover the cathode bottom meshes on both sides and are fixed by binding with PTFE wires. The pair of cathode active meshes cover the cathode elastic meshes on both sides, and the size of the cathode active meshes is larger than that of the cathode elastic meshes. The four edges of the cathode active meshes are folded inward to form a folded area. The PTFE wires are repeatedly inserted and folded between the cathode bottom meshes and the cathode active meshes to fix the four edges of the cathode active meshes. The position of the PTFE wires on the cathode active meshes is lower than the surface of the cathode active meshes supported by the cathode elastic meshes, forming a pressing area. The PTFE wires are fastened at the positions where they pass through the cathode bottom meshes, forming a fastening area. The pair of cathode bottom meshes cover the two sides of the cathode ribs. The cathode and anode sidewalls are fitted together and the ion membrane is clamped between the anode bottom mesh of the anode and the cathode active mesh of the cathode. Copper busbars are respectively provided on the outer end faces of the anode frame of the anode and the cathode frame of the cathode. The anode frame and the cathode frame are staggered and fixed together. The copper busbars on the anode frame face one side and the copper busbars on the cathode frame face the other side.

[0009] Preferably, an anode sealing gasket is provided on both sides of the anode frame, and a cathode sealing gasket is provided on both sides of the cathode frame. When the cathode and anode sidewalls are fitted together, the cathode sealing gasket and the anode sealing gasket clamp the ion membrane.

[0010] Preferably, the PTFE wire is interlaced every 100mm.

[0011] Preferably, the cathode elastic mesh is fixed using the same PTFE wire method as the cathode active mesh.

[0012] Preferably, the cathode bottom mesh is fixed by screws.

[0013] Preferably, the cathode elastic mesh adopts a "V" shaped wavy structure.

[0014] A method for modifying the membrane electrode spacing in a unipolar electrolyzer, the specific steps of which are as follows: S01: Multiple anode ribs with round holes are arranged in a longitudinal and transverse manner and fixedly installed in the anode frame; multiple cathode ribs with round holes are arranged in a longitudinal and transverse manner and fixedly installed in the cathode frame. S02: Lay a cathode elastic mesh on the cathode bottom mesh and secure it by binding with PTFE wire; S03: Lay a cathode active mesh with a size larger than the cathode elastic mesh on the cathode elastic mesh, and fold the four edges of the cathode active mesh inward. Repeatedly insert the PTFE line up and down between the cathode bottom mesh and the cathode active mesh, and fix the four edges of the cathode active mesh to the cathode bottom mesh. When fixing, the position of the PTFE line on the cathode active mesh is lower than the surface of the cathode active mesh supported by the cathode elastic mesh, and tie the PTFE line at the position where it passes through the cathode bottom mesh. S04: The anode bottom mesh is attached to the anode rib plate and fixed, and the whole is used as the anode; the cathode bottom mesh is attached to the cathode rib plate and fixed, and the whole is used as the cathode. S05: The cathode and anode are arranged alternately, and the ion membrane is placed between the cathode and anode. The anode frame and the cathode frame are arranged alternately and fixed together, so that the ion membrane is clamped between the anode bottom mesh of the anode and the cathode active mesh of the cathode. The copper busbar on the anode frame faces one side and is electrically connected to the external busbar, and the copper busbar on the cathode frame faces the other side and is electrically connected to the external busbar.

[0015] This invention provides a structure and method for modifying the membrane electrode spacing of a unipolar electrolyzer, which has the following beneficial effects: 1. The cathode of this invention uses flexible PTFE wire for binding and fixing, completely avoiding metal burrs, weld beads, or sharp breaks formed after cracking that may occur during welding. The design of folding the edges of the active mesh inwards cleverly hides and wraps all metal cut burrs, forming a smooth edge. In addition, the binding points are deliberately pressed down below the plane of the active mesh to ensure that there are no protruding contact points between the PTFE wire and the ion membrane. These multiple designs ensure that the cathode surface in contact with the ion membrane is smooth, flexible, and free of hard protrusions. Even under high-frequency vibration, it will not scratch or puncture the ion membrane, greatly improving the safety and reliability of the electrolyzer operation.

[0016] 2. The PTFE wire in this invention features high strength, corrosion resistance, and good flexibility. Through uniform binding similar to sewing and reliable bottom fastening, the active mesh, elastic mesh, and cathode bottom mesh can be tightly integrated. This flexible connection method effectively absorbs and buffers the vibration energy generated by the impact of electrolyte and airflow, distributing concentrated stress to multiple binding points. This avoids stress concentration and metal fatigue similar to welding points. Furthermore, the flexible connection method has a certain degree of self-adjustment capability, better adapting to assembly tolerances and micro-deformation during operation. Therefore, the connection structure is less prone to loosening or failure during long-term operation, ensuring lasting robustness.

[0017] 3. When using this invention, if the cathode active mesh needs to be replaced, the operator only needs to cut the PTFE line to easily remove the old active mesh and elastic mesh assembly from the cathode bottom mesh. Installing new components only requires re-binding. The entire process requires no hot work (welding, cutting), avoiding the thermal impact and potential deformation of the cathode bottom mesh substrate, and eliminating the need for specialized welding tools and personnel. This makes maintenance safer, more convenient, and less costly, significantly shortening the downtime for electrolytic cells.

[0018] 4. Because welding is eliminated, no uneven weld scars are left on the cathode bottom mesh. Each replacement uses brand new PTFE wire for binding, and a pressing process ensures that the fixing points are flat. This guarantees a large-area, uniform, and tight fit between the cathode active mesh surface and the ion membrane, which is beneficial for uniform current density distribution, thereby maintaining the high efficiency and stable operation of the electrolyzer.

[0019] 5. The fixing method involved in this invention is itself a highly efficient and reliable method for modifying the membrane electrode spacing cathode. Using this method not only improves the performance of the modified cathode but also simplifies and makes long-term maintenance easier and more predictable. This method is easy to standardize, with clearly defined quality control points (such as binding force, spacing, and fastening), which facilitates its widespread implementation within the industry. Attached Figure Description

[0020] Figure 1 This is a partial cross-sectional schematic diagram of the cathode film electrode spacing after modification according to the present invention; Figure 2 This is a schematic diagram of the installation of the cathode and anode of the electrolytic cell of the present invention; Figure 3 This is a schematic diagram of the cathode rib plate of the present invention; Figure 4 This is a schematic diagram of the modified cathode film electrode spacing according to the present invention; Figure 5 For the present invention Figure 4 A partial schematic diagram.

[0021] In the diagram: 1. Anode frame; 2. Anode rib; 3. Anode bottom mesh; 4. Anode sealing gasket; 5. Cathode frame; 6. Cathode rib; 7. Cathode bottom mesh; 8. Cathode elastic mesh; 9. Cathode active mesh; 10. Ion exchange membrane; 11. Cathode sealing gasket; 12. Copper busbar; 13. PTFE line; 14. Compression area; 15. Folding area; 16. Fastening area. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] like Figure 1-5As shown, a single-electrode electrolyzer membrane spacing modification structure includes multiple sets of staggered cathodes, ion exchange membranes 10, and anodes. The anode includes an anode frame 1, multiple anode ribs 2, and a pair of anode bottom meshes 3. The anode ribs 2 are strip-shaped and fixedly disposed within the anode frame 1. The multiple anode ribs 2 are evenly distributed longitudinally and have multiple circular holes. The pair of anode bottom meshes 3 are fixedly disposed on both sides of the anode ribs 2. The cathode includes a cathode frame 5, multiple cathode ribs 6, a pair of cathode bottom meshes 7, a pair of cathode elastic meshes 8, a pair of cathode active meshes 9, and PTFE wires 13. The cathode ribs 6 are strip-shaped and fixedly disposed within the anode frame 1. A plurality of cathode ribs 6 are evenly distributed longitudinally within the cathode frame 5, and each rib 6 has a plurality of circular holes. A pair of cathode elastic meshes 8 are respectively placed over the cathode bottom meshes 7 on both sides and are fixed by binding with PTFE wires 13. A pair of cathode active meshes 9 are respectively placed over the cathode elastic meshes 8 on both sides, and the size of the cathode active meshes 9 is larger than that of the cathode elastic meshes 8. The four edges of the cathode active meshes 9 are folded inward to form folded areas 15. PTFE wires 13 are repeatedly inserted and folded up and down between the cathode bottom meshes 7 and the cathode active meshes 9 to fix the four edges of the cathode active meshes 9. The FE wire 13 is pressed onto the cathode active mesh 9 at a position lower than the surface of the cathode active mesh 9 supported by the cathode elastic mesh 8, forming a pressing area 14. The PTFE wire 13 is fastened at the position where it passes through the cathode bottom mesh 7, forming a fastening area 16. A pair of cathode bottom meshes 7 are covered and arranged on both sides of the cathode rib plate 2. The cathode and anode sidewalls are fitted together, and the ion membrane 10 is clamped between the anode bottom mesh 3 of the anode and the cathode active mesh 9 of the cathode. Copper busbars 12 are respectively provided on the outer end faces of the anode frame 1 of the anode and the cathode frame 5 of the cathode. The anode frame 1 and the cathode frame 5 are staggered and fixed together. The copper busbars on the anode frame 1 are... The copper busbar 12 on the cathode frame 5 faces one side, and the copper busbar 12 on the cathode frame 5 faces the other side; anode sealing gaskets 4 are respectively provided on both sides of the anode frame 1, and cathode sealing gaskets 11 are respectively provided on both sides of the cathode frame 5. When the cathode and anode sidewalls are attached together, the cathode sealing gaskets 11 and anode sealing gaskets 4 clamp the ion membrane 10; the PTFE wire 13 is inserted vertically every 100 mm; the cathode elastic mesh 8 adopts the same PTFE wire 13 fixing method as the cathode active mesh 9; the cathode bottom mesh 7 is fixed by screws; the cathode elastic mesh 8 adopts a "V" shaped wavy structure.

[0024] Its detailed connection methods are well-known technologies in this field. The following mainly introduces the working principle and process, as follows: In the modification of the membrane electrode distance in this invention, firstly, multiple anode ribs 2 with round holes are arranged longitudinally and transversely and fixedly installed in the anode frame 1, and multiple cathode ribs 6 with round holes are arranged longitudinally and transversely and fixedly installed in the cathode frame 5, and fixed by welding. The round holes facilitate the flow of the bath liquid and gas. Then, a cathode elastic mesh 8 is laid on the cathode bottom mesh 7 and bound and fixed by PTFE wire 13 to prevent the cathode elastic mesh 8 from moving and ensure stability. Next, a cathode active mesh 9, larger than the cathode elastic mesh 8, is laid on the cathode active mesh 8. The four edges of the cathode active mesh 9 are folded inward to form a folded area 15. In the folded area 15, PTFE wires 13 are repeatedly inserted and folded between the cathode bottom mesh 7 and the cathode active mesh 9 to fix the four edges of the cathode active mesh 9 to the cathode bottom mesh 7, thereby wrapping the cathode elastic mesh 8. During fixing, the position of the PTFE wires 13 on the cathode active mesh 9 is lower than the surface of the cathode active mesh 9 supported by the cathode elastic mesh 8 to prevent the PTFE wires 13 from contacting the ion membrane 10 after subsequent installation. The PTFE wires 13 are tied at the positions where they pass through the cathode bottom mesh 7, i.e., knotted. The cathode active mesh 9 has good and stable support capabilities. Subsequently, the anode bottom mesh 3 is attached to and fixed on the anode rib plate 2, serving as the anode as a whole. The cathode bottom mesh 7 is attached to and fixed on the cathode rib plate 6, serving as the cathode as a whole. The anode bottom mesh 3 can be fixed to the anode frame 1 by welding, and the cathode bottom mesh 7 can be fixed to the cathode frame 5 by screws. The screw fixing method allows for disassembly, facilitating future cathode maintenance and repair. Finally, the cathode and anode are arranged alternately, and the ion membrane 10 is placed between the cathode and anode. The anode frame 1 and cathode frame 5 are arranged alternately and fixed together, so that the ion membrane 10 is clamped between the anode bottom mesh 3 of the anode and the cathode active mesh 9 of the cathode. It can be fixed by multiple tie rods passing through it. The copper busbar 12 on the anode frame 1 faces one side and is electrically connected to the external busbar, and the copper busbar 12 on the cathode frame 5 faces the other side and is electrically connected to the external busbar.

[0025] The cathode of this invention is secured using flexible PTFE wire 13, completely avoiding metal burrs, weld beads, or sharp breaks caused by cracking that may occur during welding. The design of folding the edges of the active mesh inwards cleverly conceals and wraps all metal cut edges, forming a smooth edge. Furthermore, the binding points are intentionally pressed below the plane of the active mesh, ensuring no protruding contact points between the PTFE wire 13 and the ion membrane 10. These designs provide multiple safeguards, ensuring that the cathode surface in contact with the ion membrane 10 is smooth, flexible, and free of hard protrusions. Even under high-frequency vibration, it will not scratch or puncture the ion membrane 10, greatly improving the safety and reliability of the electrolytic cell operation. Simultaneously, the PTFE wire 13 in this invention possesses high strength, corrosion resistance, and good flexibility. Through uniform binding similar to sewing and reliable bottom fastening, the active mesh, elastic mesh, and cathode bottom mesh 7 can be tightly integrated into one unit. This flexible connection method effectively absorbs and buffers the vibration energy generated by the impact of electrolyte and airflow, dispersing concentrated stress to multiple binding points. This avoids stress concentration and metal fatigue similar to welding points. Simultaneously, the flexible connection method has a certain degree of self-adjustment capability, better adapting to assembly tolerances and micro-deformation during operation. Therefore, the connection structure is less prone to loosening or failure during long-term operation, ensuring lasting robustness. Furthermore, when using this invention, if the cathode active mesh 9 needs replacement, the operator only needs to cut the PTFE line 13 to easily remove the old active mesh and elastic mesh assembly from the cathode bottom mesh 7. Installing new components only requires re-binding. The entire process requires no hot work (welding, cutting), avoiding the thermal impact and potential deformation of the cathode bottom mesh 7 substrate from high temperatures, and eliminating the need for specialized welding tools and personnel. This makes maintenance safer, more convenient, and less costly, significantly shortening the downtime for electrolytic cells. Because this invention eliminates welding, no uneven weld scars are left on the cathode bottom mesh 7. Each replacement uses brand new PTFE wire 13 for binding, and a pressing process ensures that the fixing points are flat. This guarantees a large-area, uniform, and tight fit between the surface of the cathode active mesh 9 and the ion membrane 10, which is beneficial for uniform current density distribution, thereby maintaining the efficient and stable operation of the electrolyzer.

[0026] The fixing method involved in this invention is itself an efficient and reliable method for modifying the film electrode spacing cathode. Using this method not only improves the performance of the modified cathode but also simplifies and makes long-term maintenance more predictable. This method is easy to standardize, with clearly defined quality control points (such as binding force, spacing, and fastening), which facilitates its widespread implementation within the industry.

[0027] Anode sealing gaskets 4 are provided on both sides of the anode frame 1, and cathode sealing gaskets 11 are provided on both sides of the cathode frame 5. When the cathode and anode sidewalls are attached together, the cathode sealing gaskets 11 and anode sealing gaskets 4 clamp the ion membrane 10, which ensures the sealing between the cathode and anode on the one hand, and avoids damage to the ion membrane 10 on the other hand.

[0028] When binding the cathode active mesh 9 with the PTFE wire 13, it is inserted once every 100mm. This binding density can not only ensure the stability of the cathode active mesh 9 installation, but also reduce the labor intensity during the insertion installation.

[0029] Among them, the cathode elastic mesh 8 adopts the same PTFE wire 13 fixing method as the cathode active mesh 9, and the four edges are fixed by PTFE wire 13 interlacing.

[0030] Among them, the cathode elastic mesh 8 adopts a "V" shaped wavy structure, which effectively ensures good elastic support for the ion membrane 10.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A monopolar electrolyzer membrane electrode distance retrofit structure, characterized by, The cathode, the ion membrane (10) and the anode are arranged in multiple groups in a staggered manner. The anode comprises an anode frame (1), multiple anode rib plates (2) and a pair of anode bottom nets (3), the anode rib plates (2) are strip-shaped and fixedly arranged in the anode frame (1), the multiple anode rib plates (2) are longitudinally uniformly distributed, and the anode rib plates (2) are provided with multiple circular holes, and the pair of anode bottom nets (3) are fixedly arranged on the two sides of the anode rib plates (2). The cathode comprises a cathode frame (5), multiple cathode rib plates (6), a pair of cathode bottom nets (7), a pair of cathode elastic nets (8), a pair of cathode active nets (9) and PTFE wires (13), the cathode rib plates (6) are strip-shaped and fixedly arranged in the cathode frame (5), the multiple cathode rib plates (6) are longitudinally uniformly distributed, and the cathode rib plates (6) are provided with multiple circular holes, the pair of cathode elastic nets (8) are respectively arranged on the two cathode bottom nets (7) and fixedly bound by the PTFE wires (13), the pair of cathode active nets (9) are respectively arranged on the two cathode elastic nets (8), and the size of the cathode active net (9) is larger than that of the cathode elastic net (8), the four edges of the cathode active net (9) are folded inward to form a folding area (15), the PTFE wires (13) are repeatedly inserted between the cathode bottom net (7) and the cathode active net (9) to fix the four edges of the cathode active net (9), the position of the PTFE wires (13) on the cathode active net (9) is lower than the surface of the cathode active net (9) supported by the cathode elastic net (8) to form a compression area (14), the position of the PTFE wires (13) corresponding to the position of the PTFE wires (13) penetrating out of the cathode bottom net (7) is buckled to form a buckling area (16), and the pair of cathode bottom nets (7) are arranged on the two sides of the cathode rib plates (2). The cathode and the anode are arranged in a side wall fitting manner, and the ion membrane (10) is clamped between the anode bottom net (3) of the anode and the cathode active net (9) of the cathode, the outer side end faces of the anode frame (1) of the anode and the cathode frame (5) of the cathode are respectively provided with copper bars (12), the anode frame (1) and the cathode frame (5) are arranged in a staggered manner and fixed together, the copper bars (12) on the anode frame (1) face one side, and the copper bars (12) on the cathode frame (5) face the other side.

2. A mono-polar electrolyzer membrane-thickness- distance retrofit structure according to claim 1, characterized in that, The two sides of the anode frame (1) are respectively provided with anode sealing gaskets (4), the two sides of the cathode frame (5) are respectively provided with cathode sealing gaskets (11), and the cathode sealing gaskets (11) and the anode sealing gaskets (4) clamp the ion membrane (10) when the cathode and the anode are arranged in a side wall fitting manner.

3. The single-polar electrolyzer membrane-thickness-distance retrofit structure according to claim 1, characterized in that, The PTFE wires (13) are inserted once every 100 mm.

4. The single-polar electrolyzer membrane-thickness-distance retrofit structure according to claim 1, characterized in that, The cathode elastic net (8) adopts the same PTFE wire (13) fixing mode as the cathode active net (9).

5. The single-polar electrolyzer membrane-thickness-distance retrofit structure according to claim 1, characterized in that, The cathode bottom net (7) is fixed by a screw.

6. The single-polar electrolyzer membrane-thickness-distance retrofit structure according to claim 1, characterized in that, The cathode elastic net (8) adopts a "V"-shaped wave structure.

7. A method of retrofitting a monopolar electrolyzer membrane electrode distance according to any one of claims 1-6, characterized in that, The specific steps are as follows: S01: A plurality of anode rib plates (2) with round holes are arranged longitudinally and transversely and fixedly arranged in the anode frame (1), and a plurality of cathode rib plates (6) with round holes are arranged longitudinally and transversely and fixedly arranged in the cathode frame (5); S02: The cathode elastic net (8) is laid on the cathode bottom net (7) and fixed by the PTFE wire (13); S03: The cathode active net (9) with a size larger than the cathode elastic net (8) is laid on the cathode elastic net (8), the four edges of the cathode active net (9) are folded inward, the PTFE wire (13) is repeatedly inserted up and down between the cathode bottom net (7) and the cathode active net (9), the four edges of the cathode active net (9) are fixed with the cathode bottom net (7), when fixed, the position of the PTFE wire (13) pressing on the cathode active net (9) is lower than the surface of the cathode active net (9) supported by the cathode elastic net (8), and the position corresponding to the PTFE wire (13) penetrating out of the cathode bottom net (7) is buckled; S04: The anode bottom net (3) is fixed on the anode rib plate (2) to form an anode, and the cathode bottom net (7) is fixed on the cathode rib plate (6) to form a cathode; S05: The cathode and the anode are arranged alternately, the ion exchange membrane (10) is arranged between the cathode and the anode, the anode frame (1) and the cathode frame (5) are arranged alternately and fixed together, so that the ion exchange membrane (10) is clamped between the anode bottom net (3) of the anode and the cathode active net (9) of the cathode, the copper bars (12) on the anode frame (1) face one side and are electrically connected with the external busbar, and the copper bars (12) on the cathode frame (5) face the other side and are electrically connected with the external busbar.

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