CN213507230U

CN213507230U - Electrolytic cell with differential pressure structure

Info

Publication number: CN213507230U
Application number: CN202022075289.7U
Authority: CN
Inventors: 周晓宏; 李豪敏; 金纯�
Original assignee: Suzhou Suqing Hydrogen Equipment Co ltd
Current assignee: Suzhou Suqing Hydrogen Equipment Co ltd
Priority date: 2020-09-21
Filing date: 2020-09-21
Publication date: 2021-06-22
Anticipated expiration: 2030-09-21

Abstract

The utility model discloses an electrolysis trough with differential pressure structure, include by two fixed plates of relative setting and a set of electrolysis unit of fixing between it by this fixed plate, electrolysis unit includes electrode net, diaphragm and is used for fixing utmost point frame between them, the diaphragm water-permeable sets up in adjacent two between the electrode net to separate hydrogen side and oxygen side, the constancy of pressure of hydrogen side is greater than the oxygen side, the hydrogen side with pressure differential between the oxygen side can with liquid in the hydrogen side is whole to be impressed in the oxygen side. The beneficial effects of the utility model are mainly embodied in that: the pressure of the hydrogen side is constant and is 0.02-0.1MPa higher than that of the oxygen side, and the liquid of the hydrogen side is completely pressed into the oxygen side under the pressure, so that the aim of drying the gas of the hydrogen side is fulfilled, the hydrogen of the hydrogen side can be directly collected, the production steps are simplified, and the production efficiency is improved.

Description

Electrolytic cell with differential pressure structure

Technical Field

The utility model relates to a hydrogen preparation technical field specifically relates to an electrolysis trough with differential pressure structure.

Background

Global warming, environmental deterioration, and reduction of petroleum resources, new energy is actively developed in various countries, and hydrogen energy is widely accepted as a clean energy to be applied to fuel cell systems, and is now applied to markets in bulk, such as fuel cell vehicles and hydrogen stations. At present, hydrogen is mainly prepared through a hydrolysis hydrogen production device, gas generated by the hydrolysis hydrogen production device comprises hydrogen and oxygen, and in the hydrolysis process, in order to ensure the safe operation of the hydrogen production machine, a control valve is required to be arranged to adjust the pressure inside the hydrogen production machine.

The existing hydrogen production machine adopts an electrolytic cell to generate oxyhydrogen gas by electrolysis, and the existing electrolytic cell has electrolyte on both the hydrogen side and the oxygen side, so that the electrolyzed hydrogen can not be directly used, and needs to be dried and purified to remove moisture and electrolyte in the hydrogen. The treatment steps are complicated, and the additional cost is increased, so that the problem of how to simplify the hydrogen preparation steps and improve the hydrogen preparation efficiency is urgently needed to be solved at present.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects in the prior art and provide an electrolytic cell with a differential pressure structure.

The purpose of the utility model is realized through the following technical scheme:

the electrolytic cell with a differential pressure structure comprises two fixing plates which are oppositely arranged and a group of electrolytic cells which are fixed between the two fixing plates by the fixing plates, wherein each electrolytic cell comprises an electrode net, a diaphragm and an electrode frame for fixing the two fixing plates, the diaphragm is permeable to water and is arranged between the two adjacent electrode nets so as to separate a hydrogen side from an oxygen side, the pressure on the hydrogen side is constant and is greater than that on the oxygen side, and the liquid in the hydrogen side can be completely pressed into the oxygen side by the pressure difference between the hydrogen side and the oxygen side.

Preferably, the pressure on the hydrogen side is constantly 0.02-0.1MPa greater than on the oxygen side, and the maximum liquid level height in the hydrogen side is 0.8 + -0.1 m.

Preferably, the diaphragm is composed of a plurality of layers of asbestos paper, the diameter of a gap of each layer of the asbestos paper is 7 microns, the asbestos paper is fixedly arranged between the adjacent electrode nets through a tensioning mechanism, and two sides of the asbestos paper are respectively tightly attached to the electrode nets.

Preferably, a sealing gasket is fixed on the periphery of the diaphragm in a pressing mode and is pressed by the pole frame.

Preferably, the electrode mesh is a double-layer nickel mesh woven in a positive and negative staggered manner, the nickel meshes on the positive and negative sides are arranged in a staggered manner, the salient points formed by weaving and protruding from the side plane of the nickel mesh are electrode tips, and the electrode tips are distributed on the positive and negative sides of the double-layer nickel mesh and are closely arranged.

Preferably, the double-layer nickel screen comprises forward wires, forward vertical wires perpendicular to the forward wires by adopting a warp and weft knitting method, reverse wires and reverse vertical wires perpendicular to the reverse wires by adopting a warp and weft knitting method, and the crossing points of the forward wires and the forward vertical wires and the crossing points of the reverse wires and the reverse vertical wires are the electrode tips.

Preferably, the forward filaments and the forward vertical filaments form a herringbone shape, and the reverse filaments and the reverse vertical filaments form a herringbone shape in a staggered manner.

Preferably, one side of the electrode mesh is the diaphragm, the other side of the electrode mesh is a flow channel support formed by a nickel-plated carbon steel mesh and a partition plate formed by a nickel-plated carbon steel plate, and the outer edges of the flow channel support and the partition plate are both supported on the inner wall of the electrode frame.

Preferably, the diameter of the partition plate is larger than the inner diameter of the pole frame, and the partition plate and the pole frame are in tight fit.

Preferably, the flow channel support is attached to the electrode mesh, and the deformation of the electrode mesh is 0.2-0.3mm

The beneficial effects of the utility model are mainly embodied in that:

1. the pressure of the hydrogen side is constantly 0.02-0.1MPa higher than that of the oxygen side, and the liquid of the hydrogen side is completely pressed into the oxygen side under the pressure, so that the aim of drying the gas of the hydrogen side is fulfilled, the hydrogen of the hydrogen side can be directly collected, the production steps are simplified, and the production efficiency is improved;

2. the compact asbestos paper is stacked in multiple layers to form a diaphragm with a compact surface and high strength, the asbestos paper is hydrophilic, tension formed by moisture on the surface of the asbestos paper prevents gas from passing through, hydrogen and oxygen are effectively separated, mixing of the hydrogen and the oxygen is avoided, and continuously-penetrating liquid can form circulation on the oxygen side and is input to the hydrogen side;

3. the double-layer nickel screen mesh is adopted as an electrode, the double-layer nickel screen mesh is manufactured by a warp and weft weaving method, the nickel screen meshes on the front side and the back side of the double-layer nickel screen mesh are interwoven in a herringbone structure, so that the tightness among the nickel screens is ensured, the number of electrode tips is increased, and meanwhile, the thickness of the nickel screen meshes on the two sides can be reduced to the greatest extent so as to reduce the volume of equipment;

4. compared with the traditional pure nickel screen, the specific surface area of the double-layer nickel screen is greatly increased, the current density is greatly improved, the efficiency of the electrolytic cell for producing hydrogen is improved, and the size of the electrolytic cell is reduced;

5. the flow channel support 5 and the partition plate 6 which are made of nickel-plated carbon steel have good corrosion resistance, and the service life of the equipment can be prolonged.

Drawings

The technical scheme of the utility model is further explained by combining the attached drawings as follows:

FIG. 1: the embodiment of the utility model discloses a part of the schematic diagram;

FIG. 2: the embodiment of the utility model discloses a part of the schematic diagram;

FIG. 3: schematic diagram of an embodiment of the present invention;

FIG. 4: the embodiment of the utility model discloses a part of the schematic diagram;

FIG. 5: the embodiment of the utility model provides an in the schematic diagram of electrode net.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments shown in the drawings. However, these embodiments are not limited to the present invention, and structural, method, or functional changes made by those skilled in the art according to these embodiments are all included in the scope of the present invention.

In the description of the schemes, it should be noted that the terms "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the embodiment, the operator is used as a reference, and the direction close to the operator is a proximal end, and the direction away from the operator is a distal end.

As shown in fig. 1 to 5, the present invention discloses an electrolytic cell with differential pressure structure, which comprises two fixing plates 1 arranged oppositely and a set of electrolytic units fixed between the fixing plates 1, wherein each electrolytic unit comprises an electrode net 3, a diaphragm 4 and a polar frame 2 for fixing the two, the diaphragm 4 is permeable to water and arranged between the two adjacent electrode nets 3 to separate a hydrogen side 5 and an oxygen side 6, the pressure of the hydrogen side 5 is constantly larger than that of the oxygen side 6, and the liquid in the hydrogen side 5 can be completely pressed into the oxygen side 6 by the pressure difference between the hydrogen side 5 and the oxygen side 6.

As shown in figure 2, the utility model provides a hydrogen side 5's pressure constant ratio oxygen side 6 is 0.02-0.1MPa big, and the water column height that corresponds under this pressure is 2-7 meters, and is whole the maximum liquid level height in hydrogen side 5 is 0.8 +/-0.1 m, consequently receives the liquid in hydrogen side 5 deeply and can all be impressed in oxygen side 6 to reach the gaseous dry purpose for the hydrogen side, make the hydrogen of hydrogen side can directly collect, simplified the production step, improved production efficiency. A differential pressure regulating valve (not shown in the figure) is arranged in the hydrogen side 5 to regulate the pressure in the hydrogen side 5, and further details are not given here in the prior art.

The utility model provides a diaphragm 4 comprises multilayer asbestos paper, asbestos paper adopts asbestos fiber and makes through the papermaking method, and its thickness is less than the fourth of traditional asbestos cloth, and has fine mechanical strength. The diameter of the gap of each layer of the asbestos paper is 7 mu m, the asbestos paper is fixedly arranged between the adjacent electrode nets 3 through a tensioning mechanism, and two sides of the asbestos paper are respectively clung to the electrode nets 3. The working principle of the diaphragm 4 is as follows: the dense asbestos paper is used for being stacked in multiple layers, so that the surface of the diaphragm 4 is dense and high in strength, the asbestos paper is made of a hydrophilic material, the tension formed by moisture on the surface of the asbestos paper prevents gas from passing through, hydrogen and oxygen are effectively separated, the mixture of the hydrogen and the oxygen is avoided, and continuously-permeating liquid can form circulation on the oxygen side 6 and is input into the hydrogen side 5.

As shown in fig. 4, in order to ensure the air tightness, a sealing gasket 9 is fixed on the outer circumference of the diaphragm 4 in a pressing manner, and the sealing gasket 9 is pressed by the pole frame 2. Specifically, the side surface of the polar frame 2 is provided with a pair of teeth 21, the diameter of the diaphragm 4 is larger than that of the electrode mesh 3, and at least one part of the outer edge of the diaphragm 4 is grasped by the pair of teeth 21 to fix the position of the diaphragm 4 and prevent the diaphragm from being displaced in the electrolytic process. At least one part of the sealing gasket 9 extends into the space between the adjacent electrode nets 3 and is overlapped with the part of the diaphragm 4 extending out of the electrode nets 3, the tooth tips of the pair of teeth 21 are meshed with and clamp the sealing gasket 9, and the sealing surface of the sealing gasket 9 is filled with tooth gaps for sealing, so that gas leakage is reduced. In order to increase the sealing effect, the tooth spacing of the counter-teeth 21 which are applied to the sealing gasket 9 is smaller than the tooth spacing of the counter-teeth 21 which are applied to the diaphragm 4.

The electrode mesh 3 is a double-layer nickel mesh formed by weaving the front and the back in a staggered manner, the nickel meshes on the front and the back sides are arranged in a staggered manner, the salient points formed by weaving and protruding from the side plane of the nickel mesh are electrode tips 30, and the electrode tips 30 are distributed on the front and the back sides of the double-layer nickel mesh and are closely arranged.

Specifically, as shown in fig. 5, the double-layer nickel mesh includes a forward filament 31, a forward vertical filament 32 perpendicular to the forward filament by a warp and weft knitting method, a reverse filament 33, and a reverse vertical filament 34 perpendicular to the forward filament 31 by the warp and weft knitting method, wherein the forward filament 31 and the forward vertical filament 32 form a herringbone shape, and the reverse filament 33 and the reverse vertical filament 34 form a herringbone shape which is staggered. The staggered structure of the shape like the Chinese character 'ren' enables the positive wires 31, the positive vertical wires 32, the negative wires 33 and the negative vertical wires 34 to be interwoven more tightly and stably, so that the nickel wire meshes on the positive and negative sides of the double-layer nickel wire mesh are more tightly arranged.

The cross section of the nickel wire in the double-layer nickel wire mesh in the preferred embodiment of the utility model is circular or oval. When the forward wires 31 and the forward vertical wires 32, and the reverse wires 33 and the reverse vertical wires 34 are arranged in a zigzag manner, the crossing points between the forward wires 31 and the forward vertical wires 32, and between the reverse wires 33 and the reverse vertical wires 34, which are formed by weaving and protrude from the side plane of the nickel screen, are electrode tips 30, and the electrode tips 30 are arranged on the front side and the back side of the double-layer nickel screen and are closely arranged. The structure that the nickel silk screen of positive and negative both sides was crisscross sets up can increase the number of electrode tip 30 of double-deck nickel silk screen to guarantee the stability between the positive and negative both sides nickel silk screen.

In order to facilitate processing, after the double-layer nickel screen is woven, the edge of the double-layer nickel screen is cut into a circular shape to be matched with the pole frame 2. Of course, in other embodiments, the double-layer nickel wire mesh can be directly woven into a round shape.

As further shown in fig. 1 to 2, one side of the electrode mesh 3 is the diaphragm 4, and the other side is a flow channel support 7 formed by a nickel-plated carbon steel mesh and a separator 8 formed by a nickel-plated carbon steel plate, and the outer edges of the flow channel support 7 and the separator 8 are both supported on the inner wall of the electrode frame 2. The flow channel support 5 and the partition plate 6 which are made of nickel-plated carbon steel have good corrosion resistance, and the service life of the equipment can be prolonged.

As shown in fig. 1 and 2, the flow channel support 7 is attached to the electrode mesh 3, under the supporting action of the flow channel support 7, one side of the electrode mesh 3 can bear a pressure of 0.15MPa, the deformation of the electrode mesh 3 is 0.2-0.3mm, and the strength and pressure resistance of the electrode mesh 3 are improved by the arrangement of the flow channel support 7.

The diameter of the baffle plate 8 is larger than the inner diameter of the pole frame 2, and the baffle plate and the pole frame are in tight fit. In order to ensure the tight fit between the inner wall of the pole frame 2 and the outer edge of the partition plate 8, the diameter of the partition plate 8 is larger than the inner diameter of the pole frame 2, so that the partition plate 8 always has a tension force which is outwards supported on the inner wall of the pole frame 2. Meanwhile, the tension force of the partition plate 8 on the inner wall of the pole frame 2 all the time can make the pair of teeth 201 between the pole frames 2 always keep a tight fit state, so as to ensure the tight fit between the pair of teeth 201 and the sealing gasket 9.

In addition, as shown in fig. 3, in order to fix the electrolytic unit, a bolt 10 and a nut 11 are disposed outside the fixing plate 1, and a belleville spring 12 is further disposed on the bolt 10 and between the nut 11 and the fixing plate 1, so as to ensure that the nut 11 is tightly fitted with the fixing plate 1, and to facilitate adjustment of the distance between the two fixing plates 1.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above list of details is only for the practical implementation of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the technical spirit of the present invention should be included in the scope of the present invention.

Claims

1. Electrolytic cell with differential pressure structure, comprising two fixed plates (1) arranged oppositely and a set of electrolytic cells fixed between the fixed plates (1) by the fixed plates, the electrolytic cells comprising an electrode mesh (3), a diaphragm (4) and a polar frame (2) for fixing the two, characterized in that: the diaphragm (4) is permeable to water and arranged between the two adjacent electrode nets (3) to separate a hydrogen side (5) from an oxygen side (6), the pressure of the hydrogen side (5) is constantly greater than that of the oxygen side (6), and the liquid in the hydrogen side (5) can be completely pressed into the oxygen side (6) by the pressure difference between the hydrogen side (5) and the oxygen side (6).

2. The electrolytic cell having a differential pressure structure according to claim 1, characterized in that: the pressure on the hydrogen side (5) is constantly 0.02-0.1MPa greater than that on the oxygen side (6), and the maximum liquid level height in the hydrogen side (5) is 0.8 +/-0.1 m.

3. The electrolytic cell having a differential pressure structure according to claim 1, characterized in that: the diaphragm (4) is composed of a plurality of layers of asbestos paper, the diameter of a gap of each layer of the asbestos paper is 7 mu m, the asbestos paper is fixedly arranged between the adjacent electrode nets (3) through a tensioning mechanism, and two sides of the asbestos paper are respectively clung to the electrode nets (3).

4. The electrolytic cell having a differential pressure structure according to claim 3, characterized in that: and a sealing gasket (9) is fixed on the periphery of the diaphragm (4) in a pressing way, and the sealing gasket (9) is pressed by the polar frame (2).

5. The electrolytic cell having a differential pressure structure according to claim 1, characterized in that: the electrode mesh (3) is a double-layer nickel wire mesh formed by weaving the front side and the back side in a staggered manner, the nickel wire meshes on the front side and the back side are arranged in a staggered manner, protruding points formed by weaving on the side plane of the nickel wire mesh are electrode tips (30), and the electrode tips (30) are distributed on the front side and the back side of the double-layer nickel wire mesh and are closely arranged.

6. The electrolytic cell having a differential pressure structure according to claim 5, wherein: the double-layer nickel screen comprises forward wires (31), forward vertical wires (32) and reverse vertical wires (33) which are perpendicular to the forward wires and the reverse vertical wires (34) which are woven by warps and wefts, wherein the forward vertical wires (31) and the reverse vertical wires (32) are perpendicular to the forward wires and the reverse vertical wires, and the crossing points of the forward wires (31) and the forward vertical wires (32) and the crossing points of the reverse wires (33) and the reverse vertical wires (34) are the electrode tips (30).

7. The electrolytic cell having a differential pressure structure according to claim 6, wherein: the forward wires (31) and the forward vertical wires (32) form a herringbone shape, and the reverse wires (33) and the reverse vertical wires (34) form a herringbone shape in a staggered mode.

8. An electrolytic cell having a differential pressure structure according to any one of claims 5 to 7, wherein: one side of the electrode net (3) is the diaphragm (4), the other side is a flow channel support (7) formed by a nickel-plated carbon steel net and a partition plate (8) formed by a nickel-plated carbon steel plate, and the outer edges of the flow channel support (7) and the partition plate (8) are both supported on the inner wall of the electrode frame (2).

9. The electrolytic cell having a differential pressure structure according to claim 8, wherein: the diameter of the partition plate (8) is larger than the inner diameter of the pole frame (2), and the partition plate and the pole frame are in tight fit.

10. The electrolytic cell having a differential pressure structure according to claim 8, wherein: the flow channel support (7) is attached to the electrode net (3), and the deformation of the electrode net (3) is 0.2-0.3 mm.