CN215757649U

CN215757649U - Electrolytic bath

Info

Publication number: CN215757649U
Application number: CN202121616200.1U
Authority: CN
Inventors: 白建明; 侯朋飞; 刘海锋; 栗勇; 廖运波; 张国新; 蒲国庆; 单小勇; 王昕�; 林伟宁; 黄振国; 刘密富; 郭振兴
Original assignee: China Huadian Group Co ltd Sichuan Branch; Sichuan Huadian Luding Hydropower Co ltd; Huadian Heavy Industries Co Ltd
Current assignee: China Huadian Group Co ltd Sichuan Branch; Sichuan Huadian Luding Hydropower Co ltd; Huadian Heavy Industries Co Ltd
Priority date: 2021-07-15
Filing date: 2021-07-15
Publication date: 2022-02-08
Anticipated expiration: 2031-07-15

Abstract

The utility model provides an electrolytic cell which comprises two opposite end pole structures, a middle pole plate and a plurality of electrolytic units, wherein the middle pole plate and the plurality of electrolytic units are tightly pressed between the two opposite end pole structures, every two adjacent electrolytic units are isolated through an isolation structure, and the end pole structures, the electrolytic units, the isolation structures and the middle pole plate are all rectangular structures. By adopting the structure, the whole electrolytic tank is of a rectangular structure after being installed, the transportation is more convenient, and a plurality of electrolytic tanks can be stacked to reduce the space ratio during the electrolysis, improve the space utilization rate and meet the modularization requirement; under the condition of normal pressure or medium-low pressure, the electrolytic cell can not bear larger pressure difference, so that the rectangular structure can still meet the requirement of overall strength.

Description

Electrolytic bath

Technical Field

The utility model relates to the technical field of electrolytic hydrogen production equipment, in particular to an electrolytic cell.

Background

The electrolytic hydrogen production process generally adopts a diaphragm type aqueous solution electrolytic cell to produce hydrogen, after the electrolyte is injected into the electrolytic cell, direct current is communicated with the electrolytic cell, and the anode and the cathode in the electrolytic cell can respectively generate oxygen and hydrogen.

In the prior art, an electrolytic cell usually carries out electrolysis under a high-pressure condition, and the whole electrolytic cell mostly adopts a cylindrical structure which can better adapt to the higher pressure in the electrolytic cell so as to carry out electrolysis operation normally. The electrolytic cell can also be operated at normal or medium low pressure, and because of the low internal pressure, the electrolytic cell does not need to be provided with high overall structural strength, in which case the electrolytic cell of cylindrical structure is too costly.

In addition, the current manufacturing industry has a modularization trend, modularization and standardization of production devices are the targets pursued by various manufacturers, and the conventional electrolytic cell with the cylindrical structure has large space occupation ratio, low space utilization rate and difficult transportation, and can not meet the modularization requirement.

Therefore, how to provide an atmospheric or medium-low pressure electrolytic cell capable of meeting the modularization requirement is a technical problem to be solved urgently by the technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a normal-pressure or medium-low-pressure electrolytic cell capable of meeting the modularization requirement.

In order to solve the technical problems, the utility model provides an electrolytic cell which comprises two opposite end pole structures, a middle pole plate and a plurality of electrolytic units, wherein the middle pole plate and the plurality of electrolytic units are tightly pressed between the two opposite end pole structures, every two adjacent electrolytic units are isolated through an isolation structure, and the end pole structures, the electrolytic units, the isolation structures and the middle pole plate are all rectangular structures.

By adopting the structure, the whole electrolytic tank is of a rectangular structure after being installed, the transportation is more convenient, and a plurality of electrolytic tanks can be stacked to reduce the space ratio during the electrolysis, improve the space utilization rate and meet the modularization requirement; under the condition of normal pressure or medium-low pressure, the electrolytic cell can not bear larger pressure difference, so that the rectangular structure can still meet the requirement of overall strength.

Optionally, the electrolysis unit includes a diaphragm, and a first polar plate and a second polar plate respectively disposed on two sides of the diaphragm, where the first polar plate and the second polar plate are both made of a nickel-based material.

Optionally, the surfaces of the first electrode plate and the second electrode plate are both sprayed with a catalyst to form a catalyst layer.

Optionally, the membrane comprises a layer of high polymer woven fabric covered on both sides with a layer of metal oxide.

Optionally, the membrane has a thickness in a range of 500 to 800 microns.

Optionally, isolation structure includes that baffle and cover are located the isolation frame in baffle circumference outside, the isolation frame both sides all are equipped with sealed waterline, and are adjacent it has sealed the pad to compress tightly through relative sealed waterline between the isolation structure.

Optionally, the partition plate and the isolation frame are made of carbon steel.

Optionally, papillary structures are uniformly distributed on both sides of the partition plate.

Optionally, the end pole structure includes a tension bolt, an elastic member, an end clamping plate and an end pole plate, and the tension bolt and the elastic member of the end pole structure can be matched to compress the end clamping plate and the end pole plate of the end pole structure.

Drawings

FIG. 1 is a schematic view of the structure of an electrolytic cell provided in an embodiment of the present invention;

FIG. 2 is an enlarged partial schematic view of the electrolysis cell, separator structure and intermediate plate of FIG. 1;

FIG. 3 is a schematic perspective view of the isolation structure of FIG. 1;

FIG. 4 is a schematic perspective view of the isolation structure of FIG. 3 from another perspective;

FIG. 5 is a schematic side view of the termination structure of FIG. 1;

fig. 6 is a side view schematic of the isolation structure of fig. 1.

The reference numerals in fig. 1-6 are illustrated as follows:

1 end pole structure, 11 tensioning bolts, 12 elastic pieces, 13 end clamping plates, 131 mounting holes, 14 end pole plates, 2 electrolysis units, 21 diaphragms, 22 first pole plates, 23 second pole plates, 3 isolation structures, 31 partition plates, 32 isolation frames, 33 sealing waterlines, 34 sealing gaskets, 35 electrolyte inlets, 36 electrolyte outlets and 4 middle pole plates.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an electrolytic cell provided in an embodiment of the present invention.

The embodiment of the utility model provides an electrolytic tank which comprises two opposite end pole structures 1, a middle polar plate 4 and a plurality of electrolytic units 2, wherein the middle polar plate 4 and the electrolytic units 2 are tightly pressed between the two end pole structures 1, each adjacent electrolytic unit 2 is isolated by an isolation structure 3, the end pole structures 1, the electrolytic units 2, the isolation structures 3 and the middle polar plate 4 are all rectangular structures, the rectangular structures mean that the cross sections of all the parts in the axial direction vertical to the mutual pressing are rectangular, and the whole assembled electrolytic tank is of a cuboid structure.

By adopting the structure, the whole electrolytic cell is of a rectangular structure after being installed, can be stably placed in a vehicle during transportation, and is convenient to transport; when electrolysis is carried out, a plurality of electrolytic tanks can be mutually stacked to reduce the space ratio, improve the space utilization rate and meet the modularization requirement; under the conditions of normal pressure and medium and low pressure, the electrolytic cell can not bear larger pressure difference, so the rectangular structure adopted by the embodiment can also meet the requirement of the overall length during electrolysis.

Specifically, as shown in fig. 1, two end-pole structures 1 compress a middle pole plate 4, a plurality of electrolysis units 2 and a plurality of isolation structures 3 therebetween, the middle pole plate 4 is disposed at the center between the two end-pole structures 1, and the electrolysis units 2 and the isolation structures 3 are disposed on two sides in an overlapping manner. Wherein, the two sides of the middle polar plate 4 are respectively provided with the isolation structures 3 in a close fit manner, and then the electrolysis units 2 and the isolation structures 3 are sequentially overlapped, so that the two electrolysis units 2 with the shortest distance between the two sides of the middle polar plate 4 can form a normal electrolysis environment; the end pole structures 1 at two ends comprise end pole plates 14, the two end pole plates 14 are arranged oppositely and different from the middle pole plate 4, the end pole plates 14 are firstly provided with the electrolytic units 2 towards one side of the center, then one side is overlapped to be provided with the isolation structures 3 and the electrolytic units 2, the end pole plates 14 can be matched with the isolation structure 3 closest to the center, and therefore the electrolytic units 2 between the end pole plates and the isolation structures can form a normal electrolytic environment.

It can be understood that what number of the electrolysis units 2 and the isolation structures 3 are specifically included in the electrolysis cell can be freely set according to the requirements in practical application, the utility model is not limited, if the number of the electrolysis units 2 and the isolation structures 3 is large, the voltage required for the electrolysis is high, and the voltage required for the communication between the middle pole plate 4 and the end pole structure 1 is high; if the number of electrolysis cells 2 and isolation structures 3 is small, the voltage required for communication between the intermediate plate 4 and the end plate structure 1 is low. In addition, the sizes and specific structures of the end pole structure 1, the electrolysis unit 2, the isolation structure 3 and the middle pole plate 4 are not limited in the utility model, as long as the end pole structure can electrolyze the electrolyte after being electrified to generate a corresponding product.

Referring to fig. 2, fig. 2 is a partially enlarged schematic view of the electrolysis unit, the isolation structure and the middle plate of fig. 1.

In this embodiment, the electrolysis unit 2 includes a diaphragm 21, and a first polar plate 22 and a second polar plate 23 respectively disposed on two sides of the diaphragm 21, and the first polar plate 22 and the second polar plate 23 are made of nickel-based materials.

Specifically, as shown in fig. 2, the first electrode plate 22 and the second electrode plate 23 are respectively disposed on two sides of the diaphragm 21 in a close contact manner, so that zero-pole-distance contact between the electrodes and the diaphragm material is realized, contact resistance is reduced, and electrolysis efficiency is improved. The first polar plate 22 and the second polar plate 23 are made of nickel-based materials, so that the contact resistance between the first polar plate and the diaphragm 21 can be further reduced, the voltage drop of the diaphragm 21 can be reduced, the energy conversion efficiency can be improved, and the electrolysis efficiency can be further improved.

In this embodiment, the first plate 22 and the second plate 23 are substantially the same in structure and material, and only have different names to distinguish the positive electrode and the negative electrode during electrolysis, as shown in fig. 2, in the electrolysis unit 2 on the left side of the middle plate 4, the first plate 22 is disposed on the left side of the diaphragm 21, the second plate 23 is disposed on the right side of the diaphragm 21, and in the electrolysis unit 2 on the right side of the middle plate 4, the first plate 22 is disposed on the right side of the diaphragm 21, and the second plate 23 is disposed on the left side of the diaphragm 21. That is, if the middle plate 4 is used as a positive electrode and the end plates 14 on both sides are used as negative electrodes, the first plate 22 on the left side of the diaphragm 21 is a positive electrode in the electrolysis cell 2 on the left side of the middle plate 4, the second plate 23 on the right side of the diaphragm 21 is a negative electrode, the first plate 22 on the right side of the diaphragm 21 is a positive electrode in the electrolysis cell 2 on the right side of the middle plate 4, and the second plate 23 on the left side of the diaphragm 21 is a negative electrode.

It is understood that, in practical applications, the first electrode plate 22 and the second electrode plate 23 may be made of other materials and structures, and they may be made of the same structure or different structures, and the present invention is not limited thereto, as long as they can form the electrolysis unit 2 with the diaphragm 21, and electrolyze the electrolyte to generate the electrolysis product.

In this embodiment, the surfaces of the first electrode plate 22 and the second electrode plate 23 are sprayed with a catalyst to form a catalyst layer, and the catalyst is an electrolytic catalyst with high activity and large specific surface area.

With the arrangement, the catalyst can generate more active sites on the surfaces of the first polar plate 22 and the second polar plate 23, and the active sites are matched with the structures with larger specific surface areas of the first polar plate 22 and the second polar plate 23, so that the electrolyte is more fully contacted with the first polar plate 22 and the second polar plate 23, and the electrolytic efficiency of the electrolyte on the surfaces of the first polar plate 22 and the second polar plate 23 is further improved, and the electrolytic efficiency of the electrolytic cell is improved.

In this embodiment, the separator 21 includes a high polymer woven fabric layer, both sides of which are covered with metal oxide layers.

The diaphragm 21 made of the material has lower voltage drop, can improve the energy conversion efficiency, requires lower voltage under the same current magnitude, and can reduce the overall energy consumption of the electrolytic cell. In addition, the diaphragm 21 has a lower voltage drop and can bear higher current density, under the condition that the number of the electrolysis units 2 and the input total current are not changed, the same electrolysis efficiency as the original electrolysis cell can be achieved only by a lower electrode area, namely, only the first polar plate 22 and the second polar plate 23 with smaller volumes are needed, so that the electrolysis process can be completed, and because the volumes of the first polar plate 22 and the second polar plate 23 are reduced, the volumes of the end pole structure 1, the isolation structure 3 and the middle polar plate 4 can be reduced, so that the overall cost of the electrolysis cell is indirectly reduced.

Specifically, the diaphragm 21 uses an ultrathin polyphenylene sulfide felt as a supporting framework, and polymer resin and a metal oxide layer are sprayed on both sides according to the required thickness, wherein the metal oxide layer is preferably a zirconia-based multi-component oxide, and the material has a lower voltage drop and can further improve the energy conversion efficiency.

In the present embodiment, the thickness of the diaphragm 21 ranges from 500 micrometers to 800 micrometers. The diaphragm 21 under the condition of the thickness has better energy conversion efficiency, and can effectively separate the first polar plate 22 and the second polar plate 23 at two sides, so that each electrolytic unit 2 can maintain higher-efficiency electrolysis and has longer service life.

It will be appreciated that the diaphragm 21 may be of other materials, configurations and thicknesses than those described above, and the present invention is not limited thereto, as long as it achieves the same technical effects as described above.

Referring to fig. 3-6, fig. 3 is a schematic perspective view of the isolation structure of fig. 1; FIG. 4 is a schematic perspective view of the isolation structure of FIG. 3 from another perspective; FIG. 5 is a schematic side view of the termination structure of FIG. 1; fig. 6 is a side view schematic of the isolation structure of fig. 1.

In this embodiment, isolation structure 3 includes baffle 31 and the isolation frame 32 of locating the baffle 31 circumference outside of cover, and isolation frame 32 both sides all are equipped with sealed waterline 33, and it has sealed the pad 34 to compress tightly through relative sealed waterline 33 between the adjacent isolation structure 3.

The partition plates 31 and the partition frames 32 can separate the adjacent electrolysis units 2 to prevent the electrolysis units 2 from interfering with each other; the two adjacent isolation frames 32 can press the sealing gasket 34 between the two, and the sealing gasket 34 is pressed between the sealing waterlines 33 which are oppositely arranged, so as to seal each electrolysis unit 2, wherein the material of the sealing gasket 34 can be fluorine-based plastic.

As shown in fig. 3, 4 and 6, the partition plate 31 has a mastoid structure uniformly distributed on both sides thereof, so that the fluidity of the electrolyte is enhanced, and the electrolyte is in full contact with the first electrode plate 22 and the second electrode plate 23 on both sides. The bottom of the isolation frame 32 is provided with a plurality of electrolyte inlets 35, and electrolyte can enter the electrolysis unit 2 from the electrolyte inlets 35; the top of the separation frame 32 is provided with a number of electrolyte outlets 36, from which electrolyte can flow out of the electrolysis unit 2. Keep apart frame 32 cover and establish baffle 31, can adopt welded connection between baffle 31 and the isolation frame 32, keep apart the circumference outer lane both sides of frame 32 and all be provided with sealed waterline 33, when two end polar structure 1 compress tightly each isolation structure 3, each electrolysis unit 2 and middle polar plate 4, all compress tightly sealed pad 34 between the relative sealed waterline 33, make the electrolysis trough whole keep sealed, only leave electrolyte import 35 and electrolyte export 36 for the electrolyte circulation.

It is to be understood that the arrangement positions and the arrangement numbers of the electrolyte inlets 35 and the electrolyte outlets 36 are not limited in the present invention, as long as the electrolyte inlets and the electrolyte outlets can supply the electrolyte. The manner of sealing between the separators 3, the utility model being likewise not restricted, is sufficient if it enables the individual cells 2 to remain sealed and the cell as a whole to remain sealed.

In this embodiment, the partition plate 31 and the partition frame 32 are made of carbon steel, specifically Q235 carbon steel. The carbon steel has low cost and certain strength, the electrolytic cell of the embodiment operates under the conditions of normal pressure or medium-low pressure, and the partition plate 31 and the partition frame 32 made of the carbon steel can meet the strength requirement required by the electrolytic cell. Of course, the material of the two may be other materials besides carbon steel, which is not limited in the present invention.

The end pole structure 1 in this embodiment includes the tie bolt 11, the elastic component 12, the end splint 13 and the end polar plate 14, and the tie bolt 11 and the elastic component 12 of two end pole structures 1 can cooperate, compress tightly the end splint 13 and the end polar plate 14 of two end pole structures 1.

Referring to fig. 1 and 5, in the embodiment, the elastic member 12 is a butterfly spring set, and the plurality of tie bolts 11 penetrate through the mounting holes 131 of the end clamping plates 13, and press the electrolysis unit 2, the isolation structure 3 and the middle pole plate 4 tightly through the butterfly spring set and the self-thread structure, so that the components are kept relatively fixed, and the normal operation of the electrolysis cell is ensured. Of course, the end pole structure 1 may be other structures than those described above, and the electrolytic cell may be installed and fixed by other structures, which is not limited in the present invention as long as it can press each component in the electrolytic cell and make the electrolytic cell operate normally.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.

Claims

1. An electrolytic cell characterized by: the electrolytic cell comprises two opposite end pole structures (1), and a middle pole plate (4) and a plurality of electrolytic cells (2) which are tightly pressed between the two end pole structures (1), wherein the adjacent electrolytic cells (2) are isolated by an isolation structure (3), and the end pole structures (1), the electrolytic cells (2), the isolation structure (3) and the middle pole plate (4) are all rectangular structures.

2. The electrolytic cell of claim 1 wherein: the electrolysis unit (2) comprises a diaphragm (21), and a first polar plate (22) and a second polar plate (23) which are respectively arranged on two sides of the diaphragm (21), wherein the first polar plate (22) and the second polar plate (23) are made of nickel-based materials.

3. The electrolytic cell of claim 2 wherein: and catalysts are sprayed on the surfaces of the first polar plate (22) and the second polar plate (23) to form catalyst layers.

4. The electrolytic cell of claim 2 wherein: the diaphragm (21) comprises a high polymer woven fabric layer, and both sides of the high polymer woven fabric layer are covered with metal oxide layers.

5. The electrolytic cell of claim 2 wherein: the membrane (21) has a thickness in the range of 500 to 800 microns.

6. The electrolytic cell of claim 1 wherein: isolation structure (3) are located including baffle (31) and cover isolation frame (32) in baffle (31) circumference outside, isolation frame (32) both sides all are equipped with sealed waterline (33), and are adjacent through relative between isolation structure (3) sealed waterline (33) compress tightly sealed pad (34).

7. The electrolytic cell of claim 6 wherein: the partition plate (31) and the isolation frame (32) are made of carbon steel.

8. The electrolytic cell of claim 6 wherein: mastoid structures are uniformly distributed on the two sides of the partition plate (31).

9. The electrolytic cell of claim 1 wherein: end utmost point structure (1) includes tie bolt (11), elastic component (12), end splint (13) and end polar plate (14), two end utmost point structure (1) tie bolt (11) with elastic component (12) can cooperate, will two end utmost point structure (1) end splint (13) with end polar plate (14) compress tightly.