Electrolytic cell for hydrogen production by electrolysis of water

Abstract

The utility model discloses an electrolytic tank for hydrogen production by electrolysis of water relates to the technical field of hydrogen production by electrolysis of water, the utility model discloses an electrolytic tank cylinder, first end plate, second end plate, hydrogen exhaust pipe, oxygen exhaust pipe, electrolyte input pipe, rubber pad and hydrophobic membrane, again through the installation rubber pad and hydrophobic membrane, electrolytic water enters electrolytic tank cylinder inside from electrolyte input pipe, and hydrogen and oxygen respectively export from hydrogen exhaust pipe and oxygen exhaust pipe, install rubber pad in first end plate hydrogen hole position, increase sealing effect, and hydrophobic membrane can prevent hydrogen export when carrying droplet, improve hydrogen purity, and the setting of hydrophobic membrane does not influence normal hydrogen circulation, make first end plate hydrogen hole have solid -liquid separation function, improve the purity of hydrogen export.

Description

Technical Field

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

[0002] Electrolysis of water to produce hydrogen uses electrical energy to electrolyze water (… ) decomposes into hydrogen gas ( ) and oxygen ( The electrochemical process of ) has the following basic reaction: hydrogen evolution at the cathode ( ), Anode oxygen evolution ( The core equipment of this technology is the electrolyzer, which is composed of multiple stacked electrolysis units. Each unit includes an anode, a cathode, an electrolyte membrane (such as PEM), and bipolar plates. The function of the electrolyzer is to provide a reaction site, conduct current, separate hydrogen and oxygen, and manage water, heat, and gas transport to ensure efficient, safe, and continuous production of high-purity hydrogen. According to the type of electrolyte, it can be divided into alkaline, PEM, and solid oxide electrolyzers. Electrolysis of water to produce hydrogen is a key technology for realizing green hydrogen production and promoting energy transition.

[0003] Because the hydrogen outlet of the electrolyzer lacks an effective auxiliary gas-liquid separation structure, the hydrogen produced at the cathode cannot be fully separated from the electrolyte during the discharge process. Some tiny droplets escape with the gas flow. These entrained droplets not only increase the humidity of the hydrogen but may also carry electrolyte components (such as KOH or proton exchange membrane degradation products), thereby affecting the purity of the hydrogen. High humidity hydrogen is prone to causing equipment corrosion, condensation, or catalyst poisoning when compressed, stored, or used in fuel cells, reducing system safety and operating efficiency. Therefore, a new electrolyzer for hydrogen production by water electrolysis is proposed. Utility Model Content

[0004] The purpose of this invention is to provide an electrolytic cell for producing hydrogen by electrolysis of water. Through the cooperation between components such as rubber pads and hydrophobic membranes, the hydrogen port of the first end plate has the function of solid-liquid separation, which solves the problem of insufficient hydrogen purity in existing products.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This utility model relates to an electrolyzer for hydrogen production by water electrolysis, comprising an electrolyzer body, a first end plate, a second end plate, a hydrogen discharge pipe, an oxygen discharge pipe, and an electrolyte input pipe. The first end plate is fixedly connected to the front end of the electrolyzer body, and the second end plate is fixedly connected to the rear end of the electrolyzer body. The first end plate is provided with a hydrogen discharge pipe communicating with a hydrogen port on the first end plate. An oxygen discharge pipe is provided on one side of the hydrogen discharge pipe and is fixedly connected to the first end plate. The oxygen discharge pipe communicates with an oxygen port on the first end plate. Below the hydrogen discharge pipe and the oxygen discharge pipe, an electrolyte input pipe is provided and is fixedly connected to the first end plate. The electrolyte input pipe communicates with the electrolyte inlet of the first end plate. A rubber pad is provided inside the hydrogen port on the first end plate. The rubber pad is in contact with the surface of the hydrogen discharge pipe near the first end plate. A hydrophobic membrane is fixedly connected to the rubber pad. The rubber pad, the hydrophobic membrane, and the hydrogen discharge pipe are coaxial in the transverse direction.

[0007] Furthermore, a support frame is fixedly connected to the hydrophobic membrane and is fixedly connected to the rubber pad. The support frame is coaxial with the transverse center of the hydrophobic membrane.

[0008] Furthermore, a positioning connecting rod is symmetrically fixedly connected to the inner wall of the hydrogen vent hole of the first end plate. The positioning connecting rod slides through the hydrogen discharge pipe and the rubber pad. The positioning connecting rod is internally threaded with a bolt.

[0009] Furthermore, one end of the hydrogen gas hole on the first end plate adopts a frustum shape design, and the diameter of the hydrogen gas hole on the first end plate gradually decreases from left to right.

[0010] Furthermore, a first annular baffle is fixedly connected to the inner wall of one end of the hydrogen port of the first end plate, and a second annular baffle is provided on one side of the first annular baffle and fixedly connected to the inner wall of one end of the hydrogen port of the first end plate. The diameter of the inner hole of the first annular baffle is larger than the diameter of the inner hole of the second annular baffle.

[0011] Furthermore, heat dissipation fins are fixedly connected to the surfaces of both the first end plate and the second end plate at equal intervals.

[0012] Furthermore, the heat dissipation fins body adopts a V-shaped design.

[0013] Furthermore, auxiliary air holes are symmetrically opened on the heat dissipation fin body.

[0014] This utility model has the following beneficial effects:

[0015] 1. This utility model, by installing a rubber pad and a hydrophobic membrane, allows electrolyzed water to enter the electrolytic cell from the electrolyte inlet pipe, while hydrogen and oxygen are discharged from the hydrogen outlet pipe and oxygen outlet pipe, respectively. The rubber pad is installed at the hydrogen outlet of the first end plate to increase the sealing effect, and the hydrophobic membrane can prevent hydrogen from carrying droplets during discharge, thereby improving the purity of hydrogen. The hydrophobic membrane does not affect the normal hydrogen flow, enabling the hydrogen outlet of the first end plate to have a solid-liquid separation function and improving the purity of the discharged hydrogen.

[0016] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model from one angle;

[0019] Figure 2 This is a schematic diagram of the overall structure of this utility model from another angle;

[0020] Figure 3 This is an enlarged schematic diagram of the first end plate of this utility model;

[0021] Figure 4 This is a cross-sectional view of the first end plate of this utility model;

[0022] Figure 5 This is a cross-sectional view of the heat dissipation fins of this utility model.

[0023] The attached diagram lists the components represented by each number as follows:

[0024] 1. Electrolytic cell body; 2. First end plate; 3. Second end plate; 4. Hydrogen exhaust pipe; 5. Oxygen exhaust pipe; 6. Electrolyte input pipe; 7. Rubber pad; 8. Hydrophobic membrane; 9. Support frame; 10. Positioning connecting rod; 11. First annular baffle; 12. Second annular baffle; 13. Heat dissipation fin body; 14. Auxiliary vent. Detailed Implementation

[0025] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figure 1-5 This utility model relates to an electrolytic cell for producing hydrogen by electrolysis of water, comprising an electrolytic cell body 1, a first end plate 2, a second end plate 3, a hydrogen discharge pipe 4, an oxygen discharge pipe 5, and an electrolyte input pipe 6. The first end plate 2 is fixedly connected to the front end of the electrolytic cell body 1, and the second end plate 3 is fixedly connected to the rear end of the electrolytic cell body 1. The first end plate 2 is provided with a hydrogen discharge pipe 4 communicating with a hydrogen port of the first end plate 2. An oxygen discharge pipe 5 is fixedly connected to the first end plate 2 on one side of the hydrogen discharge pipe 4, and the oxygen discharge pipe 5 communicates with an oxygen port of the first end plate 2. Below the hydrogen discharge pipe 4 and the oxygen discharge pipe 5, an electrolyte input pipe 6 is fixedly connected to the first end plate 2, and the electrolyte input pipe 6 communicates with the electrolyte inlet of the first end plate 2. A rubber pad 7 is provided inside the hydrogen port of the first end plate 2, and the rubber pad 7 contacts the surface of the hydrogen discharge pipe 4 near the first end plate 2. A hydrophobic membrane 8 is fixedly connected to the rubber pad 7. The rubber pad 7, the hydrophobic membrane 8, and the hydrogen discharge pipe 4 are coaxial in the transverse direction.

[0027] One specific application of this embodiment is as follows: Electrolyzed water enters the electrolytic cell 1 from the electrolyte inlet pipe 6, and hydrogen and oxygen are discharged from the hydrogen outlet pipe 4 and oxygen outlet pipe 5 respectively. The rubber pad 7 is installed at the hydrogen hole position of the first end plate 2. The hydrophobic film 8 can prevent hydrogen from carrying droplets when it is discharged, thereby improving the purity of hydrogen. The setting of the hydrophobic film 8 does not affect the normal hydrogen flow.

[0028] A support frame 9 is fixedly connected to the hydrophobic membrane 8 and is fixedly connected to the rubber pad 7. The support frame 9 is coaxial with the transverse center of the hydrophobic membrane 8.

[0029] One specific application of this embodiment is that the support frame 9 can enhance the compressive strength of the hydrophobic membrane 8 and prevent the hydrophobic membrane 8 from being stretched and deformed by airflow.

[0030] The first end plate 2 has a symmetrical fixed connection of positioning connecting rods 10 to the inner wall of the hydrogen port. The positioning connecting rods 10 slide through the hydrogen discharge pipe 4 and the rubber pad 7. The positioning connecting rods 10 are internally threaded with bolts.

[0031] One specific application of this embodiment is as follows: First, place the rubber pad 7 close to the hydrogen hole of the first end plate 2, then place the hydrogen exhaust pipe 4 close to the hydrogen hole of the first end plate 2, and the positioning connecting rod 10 passes through the rubber pad 7 and the hydrogen exhaust pipe 4. Then tighten the bolts to make it easy to install the rubber pad 7 and the hydrogen exhaust pipe 4 firmly. Rotate the bolts in the opposite direction to make it easy to remove the hydrogen exhaust pipe 4 or the rubber pad 7 for replacement.

[0032] The hydrogen port on the first end plate 2 is designed in the shape of a frustum, and the diameter of the hydrogen port on the first end plate 2 gradually decreases from left to right.

[0033] One specific application of this embodiment is that the frustum-shaped structure allows the gas-liquid mixture to diffuse and slide along the cone wall, avoiding positive impact on the hydrophobic membrane 8, thus protecting the hydrophobic membrane 8 and extending its service life.

[0034] A first annular baffle 11 is fixedly connected to the inner wall of one end of the hydrogen port of the first end plate 2. A second annular baffle 12 is provided on one side of the first annular baffle 11 and is fixedly connected to the inner wall of one end of the hydrogen port of the first end plate 2. The diameter of the inner hole of the first annular baffle 11 is larger than the diameter of the inner hole of the second annular baffle 12.

[0035] One specific application of this embodiment is to make the gas-liquid mixture move up and down, reduce the flow rate, extend the residence time, and make small bubbles collide and coalesce into large bubbles, making the gas-liquid mixture easier to separate. The chamfered design reduces the eddy phenomenon of the gas-liquid mixture.

[0036] Six heat dissipation fin bodies 13 are fixedly connected at equal intervals on the surfaces of the first end plate 2 and the second end plate 3.

[0037] One specific application of this embodiment is that the heat sink assembly composed of the second annular baffle 12 can work with the fan to perform forced air cooling, thereby increasing the heat dissipation area of ​​the first end plate 2 and the second end plate 3 and enhancing the heat dissipation effect.

[0038] The heat dissipation fin body 13 adopts a V-shaped design.

[0039] One specific application of this embodiment is that it can match the blowing direction, guide the airflow direction, increase the effective heat exchange area, force the airflow to change direction, form local vortices, and improve heat dissipation efficiency.

[0040] Six auxiliary air holes 14 are symmetrically opened on the heat dissipation fin body 13.

[0041] One specific application of this embodiment is to allow airflow to partially penetrate the heat sink fin body 13, avoid dead airflow angles, reduce wind resistance, improve fan efficiency, and enhance heat exchange uniformity.

[0042] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0043] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An electrolyzer for producing hydrogen by electrolysis of water, comprising an electrolyzer body (1), a first end plate (2), a second end plate (3), a hydrogen discharge pipe (4), an oxygen discharge pipe (5), and an electrolyte input pipe (6), wherein the first end plate (2) is fixedly connected to the front end of the electrolyzer body (1), and the second end plate (3) is fixedly connected to the rear end of the electrolyzer body (1); the first end plate (2) is provided with a hydrogen discharge pipe (4) communicating with a hydrogen port of the first end plate (2); an oxygen discharge pipe (5) is fixedly connected to the first end plate (2) on one side of the hydrogen discharge pipe (4), and the oxygen discharge pipe (5) is communicating with an oxygen port of the first end plate (2); an electrolyte input pipe (6) is fixedly connected to the first end plate (2) below the hydrogen discharge pipe (4) and the oxygen discharge pipe (5), and the electrolyte input pipe (6) is communicating with the electrolyte inlet of the first end plate (2), characterized in that: A rubber pad (7) is provided inside the hydrogen vent of the first end plate (2). The rubber pad (7) is in contact with the end surface of the hydrogen exhaust pipe (4) near the first end plate (2). A hydrophobic membrane (8) is fixedly connected to the rubber pad (7). The rubber pad (7), the hydrophobic membrane (8) and the hydrogen exhaust pipe (4) are coaxial in the transverse center.

2. The electrolyzer for hydrogen production by water electrolysis according to claim 1, characterized in that, A support frame (9) is fixedly connected to the hydrophobic membrane (8) and fixedly connected to the rubber pad (7). The support frame (9) is coaxial with the transverse center of the hydrophobic membrane (8).

3. The electrolyzer for hydrogen production by water electrolysis according to claim 1, characterized in that, The first end plate (2) has a positioning connecting rod (10) symmetrically fixedly connected to the inner wall of the hydrogen hole. The positioning connecting rod (10) slides through the hydrogen discharge pipe (4) and the rubber pad (7). The positioning connecting rod (10) is internally threaded with a bolt.

4. An electrolyzer for hydrogen production by water electrolysis according to claim 3, characterized in that, The hydrogen port of the first end plate (2) is designed in the shape of a frustum, and the diameter of the hydrogen port of the first end plate (2) gradually decreases from left to right.

5. An electrolyzer for hydrogen production by water electrolysis according to claim 4, characterized in that, A first annular baffle (11) is fixedly connected to the inner wall of one end of the hydrogen hole of the first end plate (2). A second annular baffle (12) is provided on one side of the first annular baffle (11) and is fixedly connected to the inner wall of one end of the hydrogen hole of the first end plate (2). The diameter of the inner hole of the first annular baffle (11) is larger than the diameter of the inner hole of the second annular baffle (12).

6. An electrolyzer for hydrogen production by water electrolysis according to claim 1, characterized in that, The first end plate (2) and the second end plate (3) are both fixedly connected with heat dissipation fin bodies (13) at equal intervals.

7. An electrolyzer for hydrogen production by water electrolysis according to claim 6, characterized in that, The heat dissipation fin body (13) adopts a V-shaped design.

8. An electrolyzer for hydrogen production by electrolysis of water according to claim 7, characterized in that, The heat dissipation fin body (13) is provided with symmetrical auxiliary air holes (14).

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