Alkaline water electrolysis cell with multilayer composite separator

Abstract

The utility model discloses a kind of alkaline water electrolysis hydrogen production electrolytic cell with multilayer composite diaphragm, including alkaline electrolytic cell body, the both sides of alkaline electrolytic cell body are equipped with side plate, several electrolytic chambers are equipped between two side plates, electrolytic chamber includes positive bipolar plate, negative bipolar plate and first gasket between positive bipolar plate and negative bipolar plate, second gasket, the inside of first gasket and second gasket is equipped with anode electrode and cathode electrode respectively, diaphragm is equipped between anode electrode and cathode electrode, diaphragm includes base film, conductive film connected in the outside of base film and gas resistance film connected in the outside of conductive film, base film includes asbestos film and polysulfone diaphragm connected in one side of asbestos film, a kind of alkaline water electrolysis hydrogen production electrolytic cell with multilayer composite diaphram of the utility model, entire alkaline water electrolysis hydrogen production electrolytic cell uses composite diaphragm, the structural design of multilayer composite diaphragm is reasonable, prolongs the service life of film.

Description

Technical Field

[0001] This utility model relates to the field of alkaline water electrolysis for hydrogen production, specifically an alkaline water electrolysis electrolyzer with a multilayer composite diaphragm. Background Technology

[0002] Alkaline water electrolysis for hydrogen production is a mature and widely used technology. Its core equipment is the alkaline water electrolysis electrolyzer, in which the diaphragm plays a crucial role in separating the anode and cathode chambers, preventing gas mixing, and conducting ions. Traditional alkaline water electrolysis electrolyzers typically use asbestos or polysulfone diaphragms. Asbestos diaphragms are easily corroded, and while polysulfone diaphragms offer relatively good performance, they suffer from insufficient ion conductivity, high gas permeability, and inadequate mechanical strength under high current densities, leading to reduced hydrogen production efficiency and a shorter diaphragm lifespan. Utility Model Content

[0003] The purpose of this invention is to provide an alkaline water electrolysis hydrogen production electrolyzer with a multilayer composite diaphragm to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an alkaline water electrolysis hydrogen production electrolyzer with a multilayer composite diaphragm, comprising an alkaline electrolyzer body, side plates on both sides of the alkaline electrolyzer body, a plurality of electrolysis chambers between the two side plates, the two side plates being connected by a plurality of connecting screws, each electrolysis chamber comprising a positive bipolar plate, a negative bipolar plate, and a first gasket and a second gasket disposed between the positive and negative bipolar plates, the inner sides of the first and second gaskets respectively being provided with an anode electrode and a cathode electrode, a diaphragm being disposed between the anode electrode and the cathode electrode, the diaphragm comprising a base membrane, a conductive membrane connected to the outside of the base membrane, and a gas barrier membrane connected to the outside of the conductive membrane, the base membrane comprising an asbestos membrane and a polysulfone diaphragm connected to one side of the asbestos membrane.

[0005] Preferably, both ends of the connecting screw are provided with locking nuts, the connecting screw is connected to the side plate through the locking nuts, the top of one side of the alkaline electrolytic cell is provided with a discharge port, and the bottom of one side of the alkaline electrolytic cell is provided with a feed port.

[0006] Preferably, a plurality of the connecting screws are equidistantly distributed, and an anti-corrosion gasket is sleeved on the outer side of the middle part of the connecting screw.

[0007] Preferably, a first septum is connected to the outer side of the positive bipolar plate, and a second septum is connected to the outer side of the negative bipolar plate. The first septum and the second septum are in contact with each other, and the outer sides of the first septum and the second septum are in contact with the positive bipolar plate and the negative bipolar plate, respectively.

[0008] Compared with the prior art, the beneficial effects of this utility model are as follows: the diaphragm includes a base membrane, a conductive membrane, and a gas barrier membrane, and the gas barrier membrane includes an asbestos membrane and a polysulfone diaphragm. The conductive membrane improves the ion conduction efficiency of the electrolyzer, and the gas barrier membrane added to the outside of the conductive membrane can effectively prevent the mutual penetration of hydrogen and oxygen, reducing the risk of cross-contamination of gases. The base membrane is a combination of an asbestos membrane and a polysulfone diaphragm, which improves the strength and corrosion resistance of the membrane. The entire alkaline water electrolysis hydrogen production electrolyzer adopts a composite diaphragm. The multi-layer composite diaphragm has a reasonable structural design, and the layers work together to extend the service life of the membrane, thereby improving the overall performance of the electrolyzer. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model;

[0010] Figure 2 This is a structural diagram of the electrolysis chamber of this utility model;

[0011] Figure 3 This is a structural diagram of the diaphragm of this utility model;

[0012] Figure 4 This is a structural diagram of the gas barrier membrane of this utility model.

[0013] In the diagram: 1. Alkaline electrolytic cell body; 2. Side plate; 3. Electrolysis chamber; 4. Connecting screw; 5. Feed inlet; 6. Discharge outlet; 7. Lock nut; 8. Anti-corrosion gasket; 9. First diaphragm; 10. Second diaphragm; 11. Positive bipolar plate; 12. Negative bipolar plate; 13. First gasket; 14. Second gasket; 15. Anode electrode; 16. Cathode electrode; 17. Diaphragm; 18. Base membrane; 19. Conductive membrane; 20. Gas barrier membrane; 21. Asbestos membrane; 22. Polysulfone diaphragm. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figure 1-4This utility model provides an alkaline water electrolysis hydrogen production electrolyzer with a multilayer composite diaphragm, including an alkaline electrolyzer body 1, with side plates 2 on both sides of the alkaline electrolyzer body 1, and a plurality of electrolysis chambers 3 between the two side plates 2. The two side plates 2 are connected by a plurality of connecting screws 4. The electrolysis chamber 3 includes a positive bipolar plate 11, a negative bipolar plate 12, and a first gasket 13 and a second gasket 14 disposed between the positive bipolar plate 11 and the negative bipolar plate 12. An anode electrode 15 and a cathode electrode 16 are respectively disposed on the inner side of the first gasket 13 and the second gasket 14. A diaphragm 17 is disposed between the anode electrode 15 and the cathode electrode 16. The diaphragm 17 includes a base membrane 18, a conductive membrane 19 connected to the outside of the base membrane 18, and a gas barrier membrane 20 connected to the outside of the conductive membrane 19. The base membrane 18 includes an asbestos membrane 21 and a polysulfone diaphragm 22 connected to one side of the asbestos membrane 21.

[0016] Please see Figure 1-4 Both ends of the connecting screw 4 are provided with locking nuts 7. The connecting screw 4 is connected to the side plate 2 through the locking nuts 7. The top of one side of the alkaline electrolytic cell 1 is provided with a discharge port 6, and the bottom of one side of the alkaline electrolytic cell 1 is provided with a feed port 5. Several connecting screws 4 are distributed at equal intervals. The outer side of the middle part of the connecting screw 4 is fitted with an anti-corrosion gasket 8. The outer side of the positive bipolar plate 11 is connected with a first septum 9, and the outer side of the negative bipolar plate 12 is connected with a second septum 10. The first gasket 13 and the second gasket 14 are in contact with each other. The outer side of the first gasket 13 and the outer side of the second gasket 14 are in contact with the positive bipolar plate 11 and the negative bipolar plate 12, respectively.

[0017] In practical use, this utility model provides an alkaline water electrolysis hydrogen production electrolyzer with a multi-layer composite diaphragm. The diaphragm 17 includes a base membrane 18, a conductive membrane 19, and a gas barrier membrane 20. The gas barrier membrane 20 includes an asbestos membrane 21 and a polysulfone diaphragm 22. The conductive membrane 19 is made of perfluorosulfonic acid resin or sulfonated polyether ether ketone. The polymer material contains abundant ion exchange groups, which can efficiently conduct hydroxide ions in a strongly alkaline environment, improving the ion conduction efficiency of the electrolyzer. Furthermore, a gas barrier membrane 20 is added to the outside of the conductive membrane 19, using alumina, carbon dioxide, or other materials. Made of inorganic materials with excellent gas barrier properties, such as silicon or zeolite molecular sieves, these inorganic materials have a dense microstructure that can effectively prevent the mutual penetration of hydrogen and oxygen, reducing the risk of gas cross-contamination. The base membrane 18 is a combination of an asbestos membrane 21 and a polysulfone membrane 22, which improves the membrane's strength and corrosion resistance. The entire alkaline water electrolysis hydrogen production electrolyzer adopts a composite membrane. The multi-layer composite membrane has a reasonable structural design, and the layers work together to extend the membrane's service life, thereby improving the overall performance of the electrolyzer.

[0018] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An alkaline water electrolysis electrolyzer for hydrogen production with a multilayer composite diaphragm, comprising an alkaline electrolyzer body (1), characterized in that: The alkaline electrolytic cell (1) has side plates (2) on both sides, and several electrolytic chambers (3) are provided between the two side plates (2). The two side plates (2) are connected by several connecting screws (4). The electrolytic chamber (3) includes a positive bipolar plate (11), a negative bipolar plate (12), and a first gasket (13) and a second gasket (14) disposed between the positive bipolar plate (11) and the negative bipolar plate (12). The first gasket (13) and the second gasket (14) An anode electrode (15) and a cathode electrode (16) are respectively provided on the inner side of the electrode. A diaphragm (17) is provided between the anode electrode (15) and the cathode electrode (16). The diaphragm (17) includes a base membrane (18), a conductive membrane (19) connected to the outside of the base membrane (18), and a gas barrier membrane (20) connected to the outside of the conductive membrane (19). The base membrane (18) includes an asbestos membrane (21) and a polysulfone diaphragm (22) connected to one side of the asbestos membrane (21).

2. The alkaline water electrolysis hydrogen production electrolyzer with a multilayer composite diaphragm according to claim 1, characterized in that: Both ends of the connecting screw (4) are provided with lock nuts (7), and the connecting screw (4) is connected to the side plate (2) through the lock nuts (7).

3. The alkaline water electrolysis hydrogen production electrolyzer with a multilayer composite diaphragm according to claim 1, characterized in that: The alkaline electrolytic cell (1) has a discharge port (6) at the top of one side and a feed port (5) at the bottom of one side.

4. The alkaline water electrolysis hydrogen production electrolyzer with a multilayer composite diaphragm according to claim 1, characterized in that: Several connecting screws (4) are evenly distributed, and an anti-corrosion gasket (8) is sleeved on the outer side of the middle part of the connecting screw (4).

5. The alkaline water electrolysis hydrogen production electrolyzer with a multilayer composite diaphragm according to claim 1, characterized in that: The positive bipolar plate (11) is connected to a first septum (9) on its outer side, and the negative bipolar plate (12) is connected to a second septum (10) on its outer side.

6. The alkaline water electrolysis hydrogen production electrolyzer with a multilayer composite diaphragm according to claim 1, characterized in that: The first gasket (13) is in contact with the second gasket (14), and the outer side of the first gasket (13) and the outer side of the second gasket (14) are in contact with the positive bipolar plate (11) and the negative bipolar plate (12), respectively.

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