Main polar plate and water electrolyser comprising same
By setting protrusions on the main electrode plate, the problems of small contact area and uneven flow field distribution between the main electrode plate and the secondary electrode grid are solved, achieving a more uniform flow field distribution and reducing energy consumption in the electrolysis chamber.
Patent Information
- Application Number
- CN202423125110.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2034-12-17
AI Technical Summary
In the existing technology, the small contact area between the large-diameter main electrode plate and the secondary electrode mesh leads to a high contact resistance value. In addition, the flow field distribution in the large-diameter main electrode plate is uneven, resulting in poor lateral flow of the flowing medium.
Several protrusions are provided on the surface of the main electrode plate. The tops of the protrusions abut against the surface of the secondary electrode grid, forming a surface contact at the abutment point. This increases the contact area between the main electrode plate and the secondary electrode grid, and changes the flow path of the fluid medium to achieve uniform distribution through the protrusions.
By setting several technical measures on the surface of the main electrode plate, the small contact area between the main electrode plate and the secondary electrode grid is solved, the contact resistance value between the main electrode plate and the secondary electrode grid is reduced, the application range of the main electrode plate is increased, the flow field distribution is made more uniform, and the energy consumption in the electrolysis chamber is reduced.
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Figure CN223688476U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to electrolytic water hydrogen production technical field, especially in a kind of main electrode plate and containing its water electrolytic cell. BACKGROUND
[0002] Alkaline electrolytic water hydrogen production refers to the process of electrolytic water hydrogen production under alkaline electrolyte environment, and electrolyte is generally 30% mass concentration KOH solution or 26% mass concentration NaOH solution.In the reaction process, under the action of direct current, water molecules get electrons on the cathode side to generate hydrogen reduction reaction, hydrogen and hydroxyl ion, and hydroxyl ion reaches the anode by crossing physical film under the action of electric field and hydroxyl side concentration difference, and loses electron to generate oxidation reaction on the anode side, and generates oxygen and water.Due to the obstruction of diaphragm, hydrogen and oxygen will not mix together through diaphragm, but electrolyte can pass through diaphragm to the other side.
[0003] Generally, alkaline electrolytic water hydrogen production electrolytic cell is formed by a plurality of electrolytic chambers in series, each electrolytic chamber is composed of main electrode plate, auxiliary electrode net, diaphragm and electrolyte, after direct current is input, water is decomposed in electrolytic chamber, and hydrogen and oxygen are generated at cathode and anode respectively.With the development of alkaline electrolytic water hydrogen production technology, the hydrogen consumption gradually increases, and the requirements of energy consumption, environmental protection and safety are improved, and water electrolytic cell gradually develops to large scale, so that the contact between main electrode plate and auxiliary electrode net is easy to be uneven, thereby leading to small contact area, high contact resistance value, and large direct current consumption of electrolytic chamber;Meanwhile, the transverse flow of alkali solution in large-diameter electrode plate is poor, and the flow field distribution is uneven, causing uneven potential voltage drop and current density, leading to more gas production in local area, and larger bubbles are formed in local area. UTILITY MODEL CONTENTS
[0004] The utility model solves the technical problem to overcome the defect that the contact area between large-diameter main electrode plate and auxiliary electrode net is small, leading to high contact resistance value, and the transverse flow of flowing medium in large-diameter main electrode plate is poor, causing uneven flow field distribution, and provides a kind of main electrode plate and water electrolytic cell containing it.
[0005] The utility model solves the above technical problem by the following technical scheme:
[0006] A kind of main electrode plate, it is arranged at the side of auxiliary electrode net, the main electrode plate and the auxiliary electrode net are both plate structure, its characterized in that, the surface of the main electrode plate is provided with several convex parts, the top of several convex parts is abutted to the surface of the auxiliary electrode net, and face contact is formed at the abutted place.
[0007] In the scheme, a plurality of protruding portions are arranged on the surface of the main electrode plate, the top end of the protruding portion abuts against the surface of the auxiliary electrode net, so that the top end of each protruding portion on the main electrode plate is in contact with the auxiliary electrode net, and a surface contact is formed at the abutting position. Compared with point contact or line contact, the contact area between the main electrode plate and the auxiliary electrode net can be further increased, thereby reducing the contact resistance value and ultimately reducing the overall energy consumption in the electrolysis cell. At the same time, the plurality of protruding portions can also block the flowing medium and change the flow path of the flowing medium, so that the flow field distribution in the main electrode plate is more uniform.
[0008] Further, a plurality of protruding portions are arranged on the two side surfaces of the main electrode plate.
[0009] In the scheme, a plurality of protruding portions are arranged on the two side surfaces of the main electrode plate, so that the two sides of the main electrode plate can correspondingly be provided with auxiliary electrode nets, thereby expanding the use range of the main electrode plate and facilitating the connection of a plurality of electrolysis cells in series to form a water electrolysis tank.
[0010] Further, a plurality of protruding portions on any one surface of the main electrode plate correspondingly form a plurality of recessed portions on the other surface.
[0011] In the scheme, the protruding portions on one surface of the main electrode plate correspondingly form recessed portions on the other surface. When the flowing medium flows between the main electrode plate and the auxiliary electrode net, a vortex is formed in the recessed portion, the flowing medium is stirred, and the concentration of the flowing medium is more uniform, thereby further optimizing the electrolysis efficiency of the electrolytic water.
[0012] Further, a plurality of protruding portions on any one surface of the main electrode plate and a plurality of recessed portions on the surface are alternately arranged.
[0013] In the scheme, the protruding portions can appropriately block the flowing medium and change its flow path, and the recessed portions can stir the flowing medium to make its concentration more uniform. The alternately arranged protruding portions and recessed portions cooperate with each other to make the flow field distribution on the main electrode plate more uniform and the structural layout on the main electrode plate more reasonable.
[0014] Further, a plurality of protruding portions on any one surface of the main electrode plate and a plurality of recessed portions correspondingly formed on the other surface are integrally pressed and formed on the main electrode plate.
[0015] In the scheme, the protruding portions and the corresponding recessed portions are integrally pressed and formed on the main electrode plate. Compared with other processing methods or separate arrangement of other elements, the manufacturing process is relatively simple, and the overall manufacturing cost is reduced.
[0016] Further, the shape of the plurality of protruding portions is at least one of a semi-ellipsoidal structure or a runway-type columnar body structure.
[0017] In the present solution, the shape of the protruding part can be a semi-ellipsoid structure or a runway-type columnar body structure, both of which can satisfy the condition that the top end of the protruding part abuts against the surface of the auxiliary electrode net and forms a surface contact at the abutting position.
[0018] Further, the long axis direction of the plurality of protruding parts is perpendicular to the flow medium inlet and outlet direction of the main electrode plate, and the short axis direction of the plurality of protruding parts is parallel to the flow medium inlet and outlet direction of the main electrode plate.
[0019] In the present solution, by such a design, the flow resistance of the flow medium in the inlet and outlet direction is increased, so as to force the flow medium to increase the moving force in the vertical direction of the inlet and outlet, and further make the flow field distribution of the main electrode plate more uniform.
[0020] Further, the long semi-axis size of the plurality of protruding parts is between 3.5 mm and 5 mm, and the short semi-axis size of the plurality of protruding parts is between 2 mm and 2.5 mm.
[0021] In the present solution, the long semi-axis size of the protruding part is between 3.5 mm and 5 mm, and the short semi-axis size is between 2 mm and 2.5 mm. While blocking the flow medium to change the flow path, the flow medium is not blocked too much, so as to prevent the flow medium from being blocked too much and being not conducive to water electrolysis.
[0022] Further, in the long axis direction of the plurality of protruding parts, the spacing size between adjacent protruding parts is between 30 mm and 50 mm; and in the short axis direction of the plurality of protruding parts, the spacing size between adjacent protruding parts is between 20 mm and 40 mm.
[0023] In the present solution, in the long axis direction of the protruding part, the spacing size between adjacent protruding parts is between 30 mm and 50 mm, and in the short axis direction of the protruding part, the spacing size between adjacent protruding parts is between 20 mm and 40 mm, which is a relatively optimal arrangement of the plurality of protruding parts on the main electrode plate.
[0024] Further, the vertical distance size from the top end of the plurality of protruding parts to the main electrode plate is between 4 mm and 6 mm.
[0025] In the present solution, the vertical distance size from the top end of the plurality of protruding parts to the main electrode plate is between 4 mm and 6 mm, which can ensure sufficient surface contact between the main electrode plate and the auxiliary electrode net.
[0026] A water electrolysis tank, characterized in that the water electrolysis tank comprises a plurality of auxiliary electrode nets, a plurality of diaphragms, and a plurality of main electrode plates as described above, and the auxiliary electrode net is arranged between adjacent diaphragms and main electrode plates.
[0027] In the scheme, the auxiliary electrode net is arranged between the adjacent diaphragm and the main electrode plate, and the combination of the diaphragm, the auxiliary electrode net and the main electrode plate forms the electrolysis cell, and finally forms the electrolysis part of the water electrolysis tank, which can solve the problems of small contact area between the large-diameter main electrode plate and the auxiliary electrode net and poor transverse flow of the flowing medium in the large-diameter main electrode plate.
[0028] The positive progress effect of the utility model lies in:
[0029] A plurality of protruding parts are arranged on the surface of the main electrode plate, the top end of the protruding part abuts against the surface of the auxiliary electrode net, so that the top end of each protruding part on the main electrode plate is in contact with the auxiliary electrode net, and at the same time, surface contact is formed at the abutting position, compared with point contact or line contact, the contact area between the main electrode plate and the auxiliary electrode net can be further increased, so as to reduce the contact resistance value, and finally reduce the overall energy consumption in the electrolysis cell. At the same time, the plurality of protruding parts can also block the flowing medium and change the flow path of the flowing medium, so that the flow field distribution in the main electrode plate is more uniform. BRIEF DESCRIPTION OF DRAWINGS
[0030] Figure 1 It is a cross-sectional structure schematic view of the element in the electrolysis cell in the utility model embodiment one.
[0031] Figure 2 It is a whole structure front view schematic view of the main electrode plate in the utility model embodiment one.
[0032] Figure 3 It is a flow schematic view of the flowing medium in the main electrode plate in the utility model embodiment one.
[0033] Figure 4 It is a whole structure front view schematic view of the water electrolysis tank in the utility model embodiment one.
[0034] Figure 5 It is a whole structure front view schematic view of the main electrode plate in the utility model embodiment two.
[0035] BRIEF DESCRIPTION OF DRAWINGS:
[0036] Main electrode plate 100
[0037] Cathode auxiliary electrode net 200
[0038] Anode auxiliary electrode net 300
[0039] Diaphragm 400
[0040] Gasket 500
[0041] Recess 110
[0042] Protruding part 120
[0043] Liquid inlet 130
[0044] outlet 140
[0045] end pressure plate 610
[0046] tensioning screw 620
[0047] electrolysis cell 630
[0048] butterfly spring 640
[0049] large nut 650 DETAILED DESCRIPTION
[0050] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and should not be understood as limiting the present application, and all other embodiments obtained by those skilled in the art without creative labor on the basis of the embodiments in the present application fall within the scope of protection of the present application.
[0051] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.
[0052] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.
[0053] Example 1
[0054] With the development of alkaline water electrolysis hydrogen production technology, the gradual increase of hydrogen consumption, the increasing requirements of energy consumption, environmental protection, safety and other requirements, and the gradual development of water electrolysis tank to large scale. For example Figure 1 and Figure 4As shown, the alkaline water electrolysis hydrogen production electrolyzer is generally composed of a plurality of electrolytic cells 630 connected in series, each electrolytic cell 630 is mainly composed of a main electrode plate 100, an anode auxiliary electrode net 300, a cathode auxiliary electrode net 200 and a diaphragm 400. The diaphragm 400 is located in the middle of the electrolytic cell 630, and the anode auxiliary electrode net 300 and the cathode auxiliary electrode net 200 are arranged on both sides of the diaphragm 400, and the main electrode plate 100 is arranged on the side away from the diaphragm 400 of the anode auxiliary electrode net 300 and the cathode auxiliary electrode net 200. Generally, a gasket 500 is arranged around the electrolytic cell 630 to play a sealing role. The diaphragm 400 separates the hydrogen and oxygen generated on the cathode and anode, and has good hydrophilic properties. After the diaphragm 400 is soaked by the electrolyte, the anions and cations can freely migrate through. In the reaction process, under the action of direct current, water molecules on the cathode side obtain electrons to undergo hydrogen evolution reduction reaction to generate hydrogen and hydroxyl ions. The hydroxyl ions reach the anode through the diaphragm 400 under the action of electric field and concentration difference on the hydroxyl side, and lose electrons on the anode side to undergo oxidation reaction to generate oxygen and water.
[0055] The main electrode plate 100 is provided on one side of the auxiliary electrode net, and the main electrode plate 100 and the auxiliary electrode net are both plate-shaped structures. A plurality of protruding portions 120 are arranged on the surface of the main electrode plate 100. The top ends of the plurality of protruding portions 120 abut against the surface of the auxiliary electrode net, and face contact is formed at the abutting positions.
[0056] As shown in Figure 1 and Figure 2 The main electrode plate 100 and the auxiliary electrode net are both circular plate-shaped structures. The auxiliary electrode net includes a cathode auxiliary electrode net 200 and an anode auxiliary electrode net 300, which are the same in structure and are collectively referred to as auxiliary electrode nets. The main electrode plate 100 is arranged on the side of the auxiliary electrode net away from the diaphragm 400. A plurality of protruding portions 120 arranged in rows and columns are arranged on the surface of the main electrode plate 100. The protruding portions 120 extend outward on the main electrode plate 100, and end faces are formed at the extending ends, and face contact is formed between the end faces and the auxiliary electrode net. Through this arrangement, the top ends of each protruding portion 120 on the main electrode plate 100 extend outward and contact the auxiliary electrode net. By using face contact, the contact area between the main electrode plate 100 and the auxiliary electrode net can be further increased compared with point contact or line contact, thereby reducing the contact resistance value and ultimately reducing the overall energy consumption in the electrolytic cell 630. At the same time, the plurality of protruding portions 120 can also block the flowing medium and change the flow path of the flowing medium, so that the flow field distribution in the main electrode plate 100 is more uniform, and the local gas production is avoided. Large bubbles are formed in the local area.
[0057] As shown in Figure 1As shown, a plurality of protruding portions 120 are arranged on both side surfaces of the main electrode plate 100, so that the main electrode plate 100 can be correspondingly arranged with a secondary electrode net on both sides, thereby expanding the use range of the main electrode plate 100, and facilitating the connection of a plurality of electrolysis cells 630 in series to form a water electrolysis tank. Of course, in the case of only one electrolysis cell 630 in the water electrolysis tank, the main electrode plate 100 can be arranged with a plurality of protruding portions 120 on only one surface, so that the surface can abut against the secondary electrode net.
[0058] As shown in FIGS. 1 and 2, the main electrode plate 100 is arranged with a plurality of protruding portions 120 on any surface, and a plurality of recessed portions 110 are correspondingly formed on the other surface. Figure 1 Figure 2 As shown, the plurality of protruding portions 120 on any surface of the main electrode plate 100 are correspondingly formed with a plurality of recessed portions 110 on the other surface. When the flowing medium flows between the main electrode plate 100 and the secondary electrode net, a vortex is formed in the recessed portion 110, which stirs the flowing medium, so that the concentration of the flowing medium is more uniform, thereby further optimizing the electrolysis efficiency of the electrolysis water, and increasing the turbulence of the flowing medium, accelerating the transportation of the bubbles, reducing the residence time of the bubbles in the chamber, reducing the situation that a plurality of small bubbles merge into a large bubble, and improving the electrolysis efficiency.
[0059] Of course, in other embodiments, the recessed portion 110 can not be arranged. In the case of arranging the recessed portion 110, the plurality of protruding portions 120 on any surface of the main electrode plate 100 and the plurality of recessed portions 110 on the surface are alternately arranged at intervals, that is, in the same direction, one recessed portion 110 is arranged between two protruding portions 120, and one protruding portion 120 is arranged between two recessed portions 110. Through this arrangement, the protruding portion 120 can appropriately block the flowing medium and change its flow path, and the recessed portion 110 can stir the flowing medium to make its concentration more uniform. The alternately arranged recessed portions 110 and protruding portions 120 cooperate with each other, so that the flow field distribution on the main electrode plate 100 is more uniform, and the structural layout on the main electrode plate 100 is more reasonable.
[0060] Further, the plurality of protruding portions 120 on any surface of the main electrode plate 100 and the plurality of recessed portions 110 correspondingly formed on the other surface are integrally pressed and formed on the main electrode plate 100. Compared with other processing methods or separately arranging other elements, the manufacturing process is relatively simple, and the overall manufacturing cost is reduced.
[0061] As shown in FIGS. 1 and 2, the plurality of protruding portions 120 on any surface of the main electrode plate 100 are correspondingly formed with a plurality of recessed portions 110 on the other surface. Figure 2 Figure 3 As shown, the shape of the plurality of protruding portions 120 in the embodiment is a semi-ellipsoid structure, and the top end of the semi-ellipsoid structure can form an end face structure on the main electrode plate 100, so that the end face can abut against the surface of the secondary electrode net and form a surface contact at the abutment position.
[0062] As shown in FIGS. 1 and 2, the plurality of protruding portions 120 on any surface of the main electrode plate 100 are correspondingly formed with a plurality of recessed portions 110 on the other surface. Figure 2 Figure 3 As shown, the protrusions 120 of the semi-ellipsoidal structure are arranged in an array on the surface of the main electrode plate 100. In the direction shown, the lower part of the main electrode plate 100 is provided with a liquid inlet 130, and the upper part of the main electrode plate 100 is provided with a liquid outlet 140. The flowing medium flows from the lower part of the main electrode plate 100 to the upper part of the main electrode plate 100. The long axis direction of the protrusions 120 is perpendicular to the direction of the liquid inlet 130 and the liquid outlet 140 of the main electrode plate 100, and the short axis direction of the protrusions 120 is parallel to the direction of the liquid inlet 130 and the liquid outlet 140 of the main electrode plate 100. Through this arrangement, the flowing medium in the cavity is guided layer by layer, the flowing medium flowing through plays a role of uniform distribution, and at the same time, the flowing resistance of the flowing medium in the inlet and outlet directions is increased, so as to force the flowing medium to increase the moving force in the vertical direction of the inlet and outlet, further make the flow field distribution of the main electrode plate 100 more uniform, solve the problem that the lateral edges of the main electrode plate 100 cannot be maximally utilized, and at the same time, the local overheating point of the main electrode plate 100 can be effectively avoided, and the performance of the water electrolysis cell is effectively improved.
[0063] Further, the long semi-axis size of the protrusions 120 is between 3.5 mm and 5 mm, and the short semi-axis size of the protrusions 120 is between 2 mm and 2.5 mm. While the flowing medium is blocked to change the flow path, the flowing medium is not blocked too much, so as to prevent the flowing medium from being blocked too much and being not conducive to the electrolysis of water. At the same time, in the long axis direction of the protrusions 120, the spacing size between adjacent protrusions 120 is between 30 mm and 50 mm, and in the short axis direction of the protrusions 120, the spacing size between adjacent protrusions 120 is between 20 mm and 40 mm. The vertical distance size from the top of the protrusions 120 to the main electrode plate 100 is between 4 mm and 6 mm, which can ensure that the main electrode plate 100 and the auxiliary electrode net are in full surface contact.
[0064] The embodiment also discloses a water electrolysis cell, as shown in the figure. Figure 4 The water electrolysis cell comprises a plurality of auxiliary electrode nets, a plurality of diaphragms 400 and a plurality of main electrode plates 100 as described above. The auxiliary electrode net is arranged between adjacent diaphragms 400 and main electrode plates 100. The auxiliary electrode net, the diaphragm 400 and the main electrode plate 100 are assembled to form an electrolysis chamber 630. The electrolysis chamber 630 is assembled with a tensioning screw 620 and an end pressing plate 610, and is fixed by using a butterfly spring 640 and a large nut 650. Finally, the basic structure of the water electrolysis cell is formed, which can solve the problems of small contact area between the large-diameter main electrode plate 100 and the auxiliary electrode net and poor transverse flow of the flowing medium in the large-diameter main electrode plate 100.
[0065] Embodiment 2
[0066] The main plate of the embodiment is the same as that of the embodiment 1 except that the shape of the protruding part 120 on the main plate is different from that of the embodiment 1. Figure 5 As shown in the figure, the shape of the protruding part 120 on the main plate of the embodiment is a track-shaped column structure, that is, the shape of the middle part is rectangular, and the shape of the two ends is semicircular. The top end of the track-shaped column structure is also a plane, which is used to abut against the auxiliary electrode net and form a surface contact therebetween. Similarly, the contact area between the main plate and the auxiliary electrode net can be increased, thereby reducing the contact resistance value and finally reducing the overall energy consumption in the electrolysis cell.
[0067] Although the specific embodiments of the utility model are described above, those skilled in the art should understand that this is only an example, the protection scope of the utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the utility model, but these changes and modifications all fall within the protection scope of the utility model.
Claims
1. A main electrode plate disposed on one side of a sub electrode mesh, the main electrode plate and the sub electrode mesh each being a plate structure, characterized in that, The surface of the main polar plate is provided with a plurality of protrusions, the top ends of the plurality of protrusions abut the surface of the auxiliary polar net, and face contact is formed at the abutting position.
2. The main plate of claim 1, wherein The surface of the main polar plate is provided with a plurality of protrusions, the top ends of the plurality of protrusions abut the surface of the auxiliary polar net, and face contact is formed at the abutting position.
3. The main plate of claim 2, wherein The plurality of protrusions on any one surface of the main polar plate correspond to a plurality of recesses formed on the other surface.
4. The main plate of claim 3, wherein The plurality of protrusions on any one surface of the main polar plate and the plurality of recesses on the surface are alternately arranged.
5. The main plate of claim 3, wherein The plurality of protrusions on any one surface of the main polar plate and the plurality of recesses correspondingly formed on the other surface are integrally pressed and formed on the main polar plate.
6. The main plate of claim 1, wherein The shape of the plurality of protrusions is at least one of a semi-ellipsoid structure or a runway-type columnar body structure.
7. The main plate of claim 6, wherein The plurality of protrusions are arranged in an array on the surface of the main polar plate, and the long axis direction of the plurality of protrusions is perpendicular to the flow medium inlet and outlet direction of the main polar plate, and the short axis direction of the plurality of protrusions is parallel to the flow medium inlet and outlet direction of the main polar plate.
8. The main plate of claim 7, wherein The long semi-axis size of the plurality of protrusions is between 3.5mm and 5mm, and the short semi-axis size of the plurality of protrusions is between 2mm and 2.5mm.
9. The main plate of claim 7, wherein In the long axis direction of the plurality of protrusions, the spacing size between adjacent protrusions is between 30mm and 50mm; in the short axis direction of the plurality of protrusions, the spacing size between adjacent protrusions is between 20mm and 40mm.
10. The main plate of claim 1, wherein The vertical distance size from the top end of the plurality of protrusions to the main polar plate is between 4mm and 6mm.
11. A water electrolyzer characterized by, The water electrolysis tank comprises: A plurality of auxiliary polar nets, a plurality of diaphragms, and a plurality of main polar plates according to any one of claims 1-10, the auxiliary polar net is arranged between adjacent diaphragms and main polar plates.