CN115323417A - Industrial electrolytic tank - Google Patents
Industrial electrolytic tank Download PDFInfo
- Publication number
- CN115323417A CN115323417A CN202210913384.0A CN202210913384A CN115323417A CN 115323417 A CN115323417 A CN 115323417A CN 202210913384 A CN202210913384 A CN 202210913384A CN 115323417 A CN115323417 A CN 115323417A
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- frame
- exchange membrane
- proton exchange
- inner edge
- reaction cavity
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/17—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof
- C25B9/19—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms
- C25B9/23—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms comprising ion-exchange membranes in or on which electrode material is embedded
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/60—Constructional parts of cells
Abstract
The invention relates to the technical field of industrial hydrogen production, and discloses an industrial electrolytic cell with stable structure and better effect of attenuating axial shear force, which comprises: a first frame (105 a); a second frame (105 b) which is attached to the first frame (105 a) to form a reaction chamber; a proton exchange membrane (110 a) for exchanging protons; the first sealing component (106 a) is arranged between the first frame (105 a) and one side joint of the proton exchange membrane (110 a), and the inner edge of the first sealing component extends to the reaction cavity; the second sealing component (106 b) is arranged between the joint of the second frame (105 b) and the other side of the proton exchange membrane (110 a), and the inner edge of the second sealing component extends to the reaction cavity; the inner edge of the second seal member (106 b) extends over a width greater than the width over which the inner edge of the first seal member (106 a) extends.
Description
Technical Field
The invention relates to the technical field of industrial hydrogen production, in particular to an industrial electrolytic cell.
Background
Proton exchange membrane electrolytic cells function as hydrogen generators by electrolyzing water to produce hydrogen and oxygen. In the prior art, pure water reacts at the oxygen electrode (anode) of the electrolytic cell to form oxygen gas, electrons, and hydrogen ions (protons) which are output from the anode side, so that the electrolytically generated hydrogen ions generate a higher pressure (e.g., 1MPa to 10 MPa) at the cathode side, so that the proton exchange membrane may be adversely affected by the increase in gas pressure caused by the discontinuity between the MEA and the flow field.
Although the prior frames are in intimate contact with the proton exchange membrane, the proton exchange membrane is constructed as an integral part of the frame assembly. However, since the edges of the frame penetrate too deeply into the membrane, penetration of such discontinuities can cause MEA damage by MEA clamping in the gap between the frame and the flow field; or the proton exchange membrane bears excessive pressure in the reaction cavity, namely the proton exchange membrane is subjected to excessive axial shearing force/stress, so that the contact side of the proton exchange membrane and the inner frame of the frame is punctured or torn by stress.
Therefore, how to reduce the axial shear/stress on the contact side of the proton exchange membrane and the inner frame of the frame to ensure the structural consistency of the proton exchange membrane becomes a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The technical problem to be solved by the present invention is that the edges of the above-mentioned frames of the prior art penetrate too deeply into the membrane, and such discontinuous penetration may cause damage to the MEA by clamping it in the gap between the frame and the flow field; or the proton exchange membrane bears overlarge pressure in the reaction cavity, namely the proton exchange membrane has the defect that the contact side of the proton exchange membrane and the inner frame of the frame is pierced or the stress is torn because of bearing overlarge axial shearing force/stress, and the industrial electrolytic cell with stable structure and better effect of attenuating the axial shearing force is provided.
The technical scheme adopted by the invention for solving the technical problems is as follows: an industrial electrolytic cell is constructed, comprising:
a first frame formed in a hollow structure;
the second frame is mutually attached to the first frame to form a reaction cavity;
the proton exchange membrane is arranged between the first frame and the second frame and is used for exchanging protons;
the first sealing component is arranged between the first frame and the joint of one side of the proton exchange membrane, and the inner edge of the first sealing component extends to the reaction cavity;
the second sealing part is arranged between the second frame and the joint of the other side of the proton exchange membrane, and the inner edge of the second sealing part extends to the reaction cavity;
the inner edge of the second seal member extends a width greater than the width of the inner edge of the first seal member.
In some embodiments, the inner edge width of the second seal member is greater than the inner edge width of the first seal member.
In some embodiments, the proton exchange membrane divides the reaction chamber into a first reaction chamber and a second reaction chamber,
the first sealing part is arranged in the first reaction chamber,
the second sealing part is arranged in the second reaction cavity.
In some embodiments, the first reaction chamber is configured as an anode chamber,
the second reaction chamber is set as a cathode chamber.
In some embodiments, at least one layer of titanium mesh and at least one layer of felt cloth are disposed within the first reaction chamber,
the titanium net and the felt cloth are arranged in a fitting mode to form an anode current collecting layer.
In some embodiments, at least two layers of felt cloth and at least one layer of titanium mesh are arranged in the second reaction chamber,
the titanium mesh and the felt cloth are arranged in a fitting mode to form a cathode current collecting layer.
In some embodiments, the first sealing member, the proton exchange membrane, and the second sealing member are disposed in a stacked and attached manner to form a seal between the first frame and the second frame.
In some embodiments, a plurality of runners are formed on the first frame and the second frame, and the runners on the same plane are symmetrically or asymmetrically arranged.
In some embodiments, a plurality of annular ribs are formed on the first frame and the second frame.
In some embodiments, at least one upwardly extending support portion is provided at a corner side of the first frame and the second frame.
The industrial electrolytic cell comprises a first frame, a second frame, a proton exchange membrane, a first sealing part and a second sealing part, wherein the first sealing part is arranged between the first frame and one side joint of the proton exchange membrane, and the inner edge of the first sealing part extends to a reaction cavity; the second sealing part is arranged between the second frame and the joint of the other side of the proton exchange membrane, and the inner edge of the second sealing part extends to the reaction cavity; the inner edge of the second sealing member extends a greater width than the inner edge of the first sealing member. Compared with the prior art, the inner edges of the first sealing part and the second sealing part extend into the reaction cavity, and the width of the inner edge of the second sealing part is larger than that of the inner edge of the first sealing part, so that the inner edges of the first sealing part and the second sealing part extend to support the proton exchange membrane and the inner edges of the first frame and the second frame, and the problem that the contact part of the proton exchange membrane and the inner frame of the frame is pierced or the stress is torn can be effectively solved by axial shearing force or stress of high pressure formed in the reaction cavity on the contact side of the proton exchange membrane and the inner frame of the first frame and the second frame when the electrolytic cell works.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a perspective view of one embodiment of an industrial electrolytic cell according to the present invention;
FIG. 2 is a perspective view of another embodiment of an industrial electrolytic cell according to the present invention;
FIG. 3 is a cross-sectional view of one embodiment of an industrial electrolytic cell according to the present invention;
FIG. 4 is a partial cross-sectional view of one embodiment of an industrial electrolyzer provided in accordance with the invention;
FIG. 5 is a partial exploded view of one embodiment of an industrial electrolytic cell according to the present invention;
FIG. 6 is a perspective view of one embodiment of the present invention providing a frame;
FIG. 7 is a partial schematic view of one embodiment of the framework of the present invention;
FIG. 8 is a partial schematic view of an embodiment of the present invention providing a first seal member and a second seal member.
Detailed Description
For a more clear understanding of the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in FIG. 1, in the first embodiment of the industrial electrolytic bath of the present invention, the industrial electrolytic bath 10 includes a first end plate 101a and a second end plate 101b. Wherein, one side of the first end plate 101a is provided with a plurality of water inlet holes 101a 1 And a water return hole (not shown) and a hydrogen discharge hole (not shown).
Specifically, the first end plate 101a and the second end plate 101b are stacked, and the first end plate 101a and the second end plate 101b are stacked with an insulating plate, a conductive plate, a titanium plate, a frame, an anode current collecting layer, a proton exchange membrane, a frame, a cathode current collecting layer, a bipolar titanium plate, an insulating plate, and the like.
As shown in fig. 2 and 3, the electrolytic assembly 200 includes insulating plates (corresponding to 102a and 102 b) disposed inside the first and second end plates 101a and 101b, wherein the insulating plates (corresponding to 102a and 102 b) include first and second insulating plates 102a and 102b disposed in a square structure or a circular structure.
The first insulating plate 102a is attached to the inner surface of the first end plate 101a, and the second insulating plate 102b is attached to the inner surface of the second end plate 101b.
Further, on the other side surfaces (i.e., the other surfaces not facing the end plates) of the first insulating plate 102a and the second insulating plate 102b, conductive plates (corresponding to 103a and 103 b) are provided. The conductive plates include a first conductive plate 103a and a second conductive plate 103b.
A terminal is provided on the extension (not covered with an insulating plate) of the first conductive plate 103a and the second conductive plate 103b, and an external dc power supply is connected to the terminal.
Insulating plates (corresponding to 102a and 102 b) are respectively arranged on the conductive plates (corresponding to 103a and 103 b) and the end plates (corresponding to 101a and 101 b) so as to ensure that no current is carried on the end plates (corresponding to 101a and 101 b) when electricity is supplied, and further improve the use safety of the electrolytic cell.
As shown in fig. 4 and 5, a first frame 105a having a hollow structure is provided on the inner side of the titanium plate (corresponding to 104 a), and may be formed in a square shape or a circular shape.
Further, a second frame 105b is provided on one side of the bipolar titanium plate (corresponding to 104 d), and its shape and structure are identical to those of the first frame 105 a.
Specifically, when the first frame 105a and the second frame 105b are fitted to each other, an electrolytic reaction chamber (corresponding to 300a and 300 b) is formed. Wherein the frame is made of amorphous thermoplastic, and has high transparency and high hydrolytic stability.
The proton exchange membrane 110a is disposed between the anode and the cathode. Upon electrolysis, the purified water electrolytically reacts at the anode electrode to form oxygen, electrons, and hydrogen ions (protons). The oxygen and a portion of the purified water flow back to the water storage component, while the protons and water migrate to the cathode side through the proton exchange membrane 110a, passing through the cathode catalyst layer and the cathode diffusion layer, such that the hydrogen ions form hydrogen gas at the cathode.
Referring to fig. 4, the pem 110a is disposed between the first frame 105a and the second frame 105b and covers the hollow portions of the first frame 105a and the second frame 105b for exchanging protons.
Further, the first sealing member 106a is made of a flexible material such as silicone or teflon to increase the reliability of the sealing.
Specifically, the first sealing member 106a is disposed between the first frame 105a and the one side of the proton exchange membrane 110a, and the inner edge of the first sealing member 106a extends into the reaction chamber (corresponding to 300a and 300 b).
The second sealing member 106b is disposed between the second frame 105b and the joint of the other side of the proton exchange membrane 110a, and the inner edge of the second sealing member 106b extends into the reaction chamber (corresponding to 300a and 300 b).
Referring to fig. 4, the inner edge of the second sealing member 106b extends a width greater than the inner edge of the first sealing member 106a, and the second sealing member 106b cooperates with the first sealing member 106a to form a support platform for clamping the proton exchange membrane 110a, so that the gas pressure on the cathode side 300b forms an axial shear force or stress applied to the support platform extending outward from the second sealing member 106b, and the pressure or shear force on the cathode side 300b is dispersed by the second sealing member 106 b.
Specifically, when the electrolytic cell is operated, i.e., a direct current power supply is connected to the conductive plates (corresponding to 103a and 103 b), and pure water is continuously introduced, the pure water is electrolyzed on the anode side (corresponding to the stacked titanium mesh 107a and the felt cloth 107 b) to generate oxygen, electrons, and hydrogen ions, and the oxygen and the pure water flow back to the water storage component through the discharge port (not shown), and the hydrogen ions permeate the proton exchange membrane 110a to form hydrogen on the cathode side 300b, i.e., a large amount of hydrogen is on the cathode side 300b, so that the cathode side 300b generates a high air pressure (e.g., 15MPa-30 MPa), and the proton exchange membrane 110a bears a large axial shear force or stress on the cathode side 300b, resulting in a creep deformation or mechanical deformation of the proton exchange membrane 110 a; or
Where the pem 110a contacts the inner frame of the frame (105 a and 105b, respectively), it is pierced or stress-torn by axial shear forces. Axial shear force or stress is formed by air pressure on the cathode side 300b and is applied to the support platform extending outwards from the second sealing part 106b, so that the second sealing part 106b and the first sealing part 106a are dislocated, the second sealing part 106b, the proton exchange membrane 110a and the first sealing part 106a are prevented from being tangent to the inner edge of the reaction chamber (corresponding to 300a and 300 b), and the axial shear force or stress is dispersed or released to the cathode side 300b through the second sealing part 106b, so that the service life of the proton exchange membrane 110a is prolonged.
By using the technical scheme, the inner edges of the first sealing member 106a and the second sealing member 106b extend into the reaction chambers (300 a and 300 b), and the width of the inner edge extending the second sealing member 106b is greater than the width of the inner edge extending the first sealing member 106a, so that the inner edges extending the first sealing member 106a and the second sealing member 106b support the inner edges of the proton exchange membrane 110a and the first frame 105a and the second frame 105b, thereby effectively solving the axial shear force or stress on the inner frame contact side of the proton exchange membrane 110a and the first frame 105a and the second frame 105b caused by the high air pressure formed in the reaction chambers (300 a and 300 b) when the electrolytic cell is in operation, and avoiding the problem that the contact inner frame of the proton exchange membrane 110a and the frames (corresponding to 105a and 105 b) is pierced or torn by the stress.
In some embodiments, in order to improve the stability of the operation of the proton exchange membrane 110a, referring to fig. 8, the width of the inner edge of the second sealing member 106b may be greater than that of the inner edge of the first sealing member 106 a. Referring to fig. 4, the inner edges of the first sealing member 106a and the second sealing member 106b extend into the reaction chambers (300 a and 300 b) to form a support table at the contact position between the proton exchange membrane 110a and the inner frame of the frame (corresponding to 105a and 105 b), so that the joint position between the proton exchange membrane 110a and the inner frame of the frame (corresponding to 105a and 105 b) is dislocated.
Here, since the proton exchange membrane 110a is subjected to a larger axial pressure on the cathode side (the side of the reaction chamber 300 b) than on the cathode side (the side of the reaction chamber 300 a), the inner edge of the second seal member 106b is set to be larger than the width of the inner edge of the first seal member 106a, and the difference between the widths is shown by W (e.g., 2mm to 5 mm).
Further, the pem 110a disposed between the frames (corresponding to 105a and 105 b) divides the reaction chambers (300 a and 300 b) into a first reaction chamber (corresponding to 300 a) and a second reaction chamber (corresponding to 300 b). The first sealing member 106a is disposed in the first reaction chamber (corresponding to 300 a), and the second sealing member 106b is disposed in the second reaction chamber (corresponding to 300 b).
Further, the first reaction chamber (corresponding to 300 a) is configured as an anode chamber, and the second reaction chamber (corresponding to 300 b) is configured as a cathode chamber.
In some embodiments, referring to fig. 4, in order to ensure the working performance of the proton exchange membrane 110a, at least one titanium mesh (corresponding to 107 a) and at least one felt cloth (corresponding to 107 b) may be disposed in the first reaction chamber (corresponding to 300 a), wherein the titanium mesh (corresponding to 107 a) is used for transporting the electrolyzed water, and the felt cloth (corresponding to 107 b) is used for protecting the proton exchange membrane 110a.
Specifically, the thickness of the titanium mesh (corresponding to 107 a) is greater than that of the felt (corresponding to 107 b), which are square structures, and they are attached to each other to form an anode current collecting layer.
Furthermore, at least two layers of felt cloth (corresponding to 107c and 107 d) and at least one layer of titanium mesh (corresponding to 107 e) are arranged in the second reaction chamber (corresponding to 300 b),
felt (corresponding to 107c and 107 d) and titanium mesh (corresponding to 107 e) are attached to each other to form a cathode current collecting layer.
In some embodiments, in order to ensure the sealing performance of the frames (corresponding to 105a and 105 b), the first sealing member 106a, the proton exchange membrane 110a and the second sealing member 106b may be stacked and attached, wherein the outer edges of the first sealing member 106a, the proton exchange membrane 110a and the second sealing member 106b are flush with the outer edges of the first frame 105a and the second frame 105b, and the inner edges of the first sealing member 106a and the second sealing member 106b extend in the radial direction (i.e., towards the reaction chamber), so as to form a seal between the first frame 105a and the second frame 105 b.
In some embodiments, referring to fig. 6, a plurality of flow channels (corresponding to 108 a) may be formed on the first frame 105a and the second frame 105b for the stability of the operation of the pem 110a.
Although fig. 6 shows only the second frame 105b, the second frame 105b is rotated 180 degrees, which is a structure of one end surface of the first frame 105 a.
Wherein, a plurality of runners (corresponding to 108 a) are arranged on the same plane and are symmetrically or asymmetrically arranged. A plurality of partitions 108b are radially provided in the flow path (corresponding to 108 a), and the partitions 108b divide the flow path (corresponding to 108 a) into a plurality of small flow paths.
Furthermore, the partition 108b also serves to support the joint surface of the proton exchange membrane 110a and the second frame 105b, so as to prevent the proton exchange membrane 110a from collapsing into the flow channel (corresponding to 108 a) due to squeezing during installation, thereby preventing the water path from being blocked.
Wherein, one side of the second frame 105b is opened with a water inlet hole 120a, and the other side of the second frame 105b is opened with a water outlet hole 120b, that is, the electrolyzed water is fed from the water inlet hole 101a of the first end plate 101a 1 Enters the tank, flows through felt cloth (corresponding to 107c and 107 d) and titanium mesh (corresponding to 107 e) through the water inlet through hole 120a, is electrolyzed, and then flows back to the outside from the water outlet through hole 120 b.
In some embodiments, for the sealing performance of the frames (corresponding to 105a and 105 b), referring to fig. 6 and 7, a plurality of sets of ribs (corresponding to 108c and 108 d) may be disposed on the first frame 105a and the second frame 105b, wherein the ribs (corresponding to 108c and 108 d) are formed on two end surfaces of the first frame 105a and the second frame 105b, and the ribs (corresponding to 108c and 108 d) surround the fixing through holes (corresponding to 130) formed on the first frame 105a and the second frame 105b, so as to ensure the sealing performance of the frames (corresponding to 105a and 105 b) in cooperation.
Furthermore, at least one supporting portion 140 extending upward is disposed at the corner side of the first frame 105a and the second frame 105b, and the first sealing member 106a, the proton exchange membrane 110a and the second sealing member 106b are sequentially stacked on the first frame 105a and the second frame 105b, at this time, the supporting portion 140 and the annular rib (corresponding to 108c and 108 d) are mutually matched, so that the first sealing member 106a, the proton exchange membrane 110a and the second sealing member 106b can be horizontally attached to the first frame 105a or the second frame 105b, and further, the matching tightness of the frames (corresponding to 105a and 105 b) is ensured.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. An industrial electrolytic cell, comprising:
a first frame formed in a hollow structure;
the second frame is mutually attached to the first frame to form a reaction cavity;
the proton exchange membrane is arranged between the first frame and the second frame and is used for exchanging protons;
the first sealing component is arranged between the first frame and the joint of one side of the proton exchange membrane, and the inner edge of the first sealing component extends to the reaction cavity;
the second sealing part is arranged between the second frame and the joint of the other side of the proton exchange membrane, and the inner edge of the second sealing part extends to the reaction cavity;
the inner edge of the second seal member extends a width greater than the width of the inner edge of the first seal member.
2. The industrial electrolyzer of claim 1 characterized in that,
the inner edge width of the second seal member is greater than the inner edge width of the first seal member.
3. The industrial electrolyzer of claim 1 characterized in that,
the proton exchange membrane divides the reaction cavity into a first reaction cavity and a second reaction cavity,
the first sealing part is arranged in the first reaction chamber,
the second sealing part is arranged in the second reaction cavity.
4. The industrial electrolyzer of claim 3 characterized in that,
the first reaction chamber is set as an anode chamber,
the second reaction chamber is set as a cathode chamber.
5. The industrial electrolyzer of claim 4 characterized in that,
at least one layer of titanium mesh and at least one layer of felt cloth are arranged in the first reaction cavity,
the titanium net and the felt cloth are arranged in a fitting mode to form an anode current collecting layer.
6. The industrial electrolyzer of claim 4 characterized in that,
at least two layers of felt cloth and at least one layer of titanium net are arranged in the second reaction cavity,
the titanium mesh and the felt cloth are arranged in a fitting mode to form a cathode current collecting layer.
7. The industrial electrolyzer of claim 4 characterized in that,
the first sealing component, the proton exchange membrane and the second sealing component are arranged in a laminating and fitting mode to form sealing between the first frame and the second frame.
8. The industrial electrolyzer of claim 7 characterized in that,
a plurality of runners are formed on the first frame and the second frame, and the runners on the same plane are symmetrically or asymmetrically arranged.
9. The industrial electrolyzer of claim 8 characterized in that,
a plurality of annular convex ribs are formed on the first frame and the second frame.
10. The industrial electrolyser as claimed in claim 9,
and at least one supporting part extending upwards is arranged at the corner side of the first frame and the second frame.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2022105343892 | 2022-05-17 | ||
| CN202210534389 | 2022-05-17 |
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| Publication Number | Publication Date |
|---|---|
| CN115323417A true CN115323417A (en) | 2022-11-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210913384.0A Pending CN115323417A (en) | 2022-05-17 | 2022-07-29 | Industrial electrolytic tank |
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| CN (1) | CN115323417A (en) |
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