Electrolyzed water polar plate with petal-shaped array flow field

Abstract

The utility model discloses an electrolyzed water polar plate with a petal-shaped array flow field, and belongs to the technical field of hydrogen production by electrolyzed water. The electrolytic water polar plate mainly comprises an outer ring frame and a polar plate, the outer ring frame is provided with a plurality of gas-liquid outlets, a plurality of electrolyte inlets, sunken steps corresponding to a diaphragm material and an electrode material, and a sealing waterline playing a sealing role; and petal-shaped array flow fields are arranged on the two side surfaces of the water electrolysis polar plate. A plurality of petal-shaped protrusions which are ingeniously designed are arranged in a staggered annular array mode to form a gas-liquid flow channel. The gas-liquid mixed flow velocity in the flow field space can be effectively improved by adjusting the appropriate bulge specification and the annular array spacing, and the adhesion of hydrogen and oxygen bubbles on the polar plate is reduced, so that the ohmic potential drop and the working energy consumption of the electrolytic bath in the electrolysis process are reduced, and efficient and green hydrogen production is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydrogen production by electrolyzing water, and specifically relates to an electrode plate with a petal-shaped array flow field. Background Art

[0002] Hydrogen production by water electrolysis includes alkaline water electrolysis, proton exchange membrane water electrolysis, and solid oxide water electrolysis. Compared with the other two electrolysis hydrogen production technologies, alkaline water electrolysis has the advantages of wide commercialization, high technical maturity, low equipment cost, large hydrogen production scale, and long service life. The working temperature of alkaline water electrolysis is moderate, and the requirements for material selection, sealing and operation control are not so stringent.

[0003] At present, alkaline electrolyzers at home and abroad all use a filter press structure of flow field bipolar plate + cathode current collector + electrolytic diaphragm + anode current collector + flow field bipolar plate as the electrolysis unit. Polytetrafluoroethylene (PTFE) is used as a sealing material, and corrugated current collectors and concave-convex stamping plates are mostly used to form a flow field structure in large electrolyzers. The corrugated electrode plate is an electrode that integrates a corrugated flow field and a current collector. It can be assembled with a flat plate to form a complete plate. It has the characteristics of high yield and convenient assembly. It is a commercial-oriented method; while the concave-convex stamping plate is a unique spherical concave-convex array arrangement of the flow field plate, which is welded with the outer ring frame to form a complete plate, which improves the uniformity of the alkali solution flow rate, current density and temperature distribution. However, both methods have the phenomenon of weakening kinetic energy caused by the vortex generated by the chaotic flow direction, resulting in low alkali solution flow rate and serious gas stagnation. In addition, the disadvantages of low conductivity efficiency, low current density and high unit energy consumption caused by the small connection area with the current collector limit the development of alkaline water hydrogen production technology. Utility Model Content

[0004] Based on the technical problems brought about by the above-mentioned alkaline water electrolysis hydrogen production intermediate plate, the utility model is based on the existing water electrolysis plate outer frame structure and proposes a new water electrolysis plate with a petal-shaped array flow field inside; it has a petal-shaped array flow field to effectively increase the internal gas-liquid flow rate, reduce gas stagnation, increase the conductive area of ​​the plate and the collector, and then reduce the electrolysis chamber voltage under the same conditions, improve the equipment electrolysis efficiency, and reduce unit energy consumption.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A water electrolysis plate with a petal-shaped array flow field, comprising an outer ring frame and a sealing water line, characterized in that: a gas-liquid outlet and an electrolyte inlet are arranged on the outer ring frame, a plate is arranged inside the outer ring frame, and a petal-shaped array flow channel is arranged on the plate;

[0007] The petal-shaped array flow field includes petal-shaped protrusions and array channels formed between the protrusions; the petal-shaped protrusions are arranged in a staggered circular array, and the tip direction of the petal-shaped protrusions is consistent with the gas-liquid flow direction;

[0008] The lower part of the petal-shaped protrusion adopts a semi-circular arc with a radius of R1, and the upper tip is formed by the intersection of a first arc with a radius of R2 and a second arc with a radius of R3;

[0009] The petal-shaped protrusions include two types: type A petal-shaped protrusions and type B petal-shaped protrusions.

[0010] In the type A petal-shaped protrusion, the centers of the first arc, the second arc, and the center of the semi-circular arc are on the same straight line, and R1 < R3 < R2; the central angle φ1 of the first arc is 1° - 20°

[0011] The type A petal-shaped protrusions are arranged in a circular array, the central angle φ2 between array units is 1° - 30°, and the total number n of array units is 1 - 20.

[0012] The adjacent circular arrays are arranged in a staggered manner; in the type B petal-shaped protrusion, the centers of the first arc, the second arc, and the center of the semi-circular arc are on the same straight line, and the centers of the first arc and the second arc are on both sides of the center of the semi-circular arc, R1 < R2 = R3, and R2 is 5R1 - 30R1.

[0013] According to the above-mentioned electrolytic water electrode plate with a petal-shaped array flow field, it is characterized in that the type B petal-shaped protrusions are distributed on the midline of the gas-liquid outlet and the electrolyte inlet, the distance L between the longitudinal tip vertices of two adjacent type B petal-shaped protrusions is 5R1 - 30R1, and the total number n of type B petal-shaped protrusions is 1 - 20.

[0014] Petal-shaped array flow fields are provided on both sides of the electrode plate.

[0015] The vertical space of the flow field is formed in the cavity between the electrode material and the surface of the electrode plate, the horizontal space of the flow channel is formed between the petal-shaped protrusions, the electrolyte enters the flow field space through multiple inlets for electrolysis reaction, and finally the gas-liquid flows out from the multiple outlets, constituting the electrolysis reaction process of a small chamber.

[0016] Beneficial effects of the utility model: The utility model innovatively uses a petal-shaped array flow field. According to the flow characteristics of the electrolyte fluid and the heat and mass transfer effects of the fluid, the plate is arranged in a staggered annular array through a number of petal-shaped protrusions to form a gas-liquid flow channel, and the direction of the petal tip is consistent with the overall gas-liquid flow direction. By adjusting the appropriate protrusion specifications and annular array spacing in combination with the simulation analysis results, the gas-liquid mixed flow velocity in the flow field space can be effectively increased, and the attachment of hydrogen and oxygen bubbles on the plate can be reduced, thereby reducing the ohmic potential drop in the electrolysis process and the working energy consumption of the electrolyzer, and achieving efficient and green hydrogen production.

[0017] like Figure 1 As shown, the utility model designs the flow field flow channel into a petal-shaped array flow channel. When the electrolyte driven by the circulation pump flows through, the petal-shaped protrusion array matching the direction of the liquid inlet and outlet will divert the electrolyte, accelerate it along the staggered annular array protrusions, and drive the bubbles generated by electrolysis to quickly break away from the electrode surface; the unique protrusion array will directionally accelerate the gas-liquid mixed flow generated in the electrolysis process, effectively reducing the kinetic energy weakening phenomenon caused by the vortex generated by the chaotic flow direction of the Karman vortex street effect in the mixed flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a simulation model and simulation result schematic diagram of the utility model.

[0019] Figure 2 It is a schematic diagram of the arrangement of the A-type petal-shaped protrusion array of the utility model in the flow field.

[0020] Figure 3 It is a schematic diagram of the arrangement of the B-type petal-shaped protrusion array of the utility model in the flow field.

[0021] Figure 4 It is a front view of the overall structure of the electrode plate of the utility model.

[0022] Figure 5 It is a schematic cross-sectional view of the A-type petal-shaped protrusion of the utility model.

[0023] Figure 6 It is a schematic cross-sectional view of a B-type petal-shaped protrusion of the utility model.

[0024] Figure 7 It is a schematic diagram of a specific implementation method of the utility model.

[0025] In the figure: 1. outer ring frame, 2. gas-liquid outlet, 2a. back gas-liquid outlet, 3. sunken step, 4. sealing waterline, 5. pole plate, 6. A-type petal-shaped protrusion, 7. B-type petal-shaped protrusion, 8. electrolyte inlet, 8a. back electrolyte inlet, 9. A-type first arc, 9a. B-type first arc, 10. A-type second arc, 10a. B-type second arc, 11. A-type semicircular arc, 11a. B-type semicircular arc 12. petal-shaped array flow channel. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0027] A water electrolysis plate with a petal-shaped array flow field is mainly formed by an outer ring frame 1, a plate 5 and a sealing water line 4 for sealing. The outer ring frame 1 is provided with a gas-liquid outlet 2 and an electrolyte inlet 8, a back gas-liquid outlet 2a and a back electrolyte inlet 8a, a metal pressing sheet for fixing, and a positioning hole for installation. A petal-shaped array flow field 12 is provided on the plate 5.

[0028] The petal-shaped array flow field includes petal-shaped protrusions and array flow channels formed between the protrusions; the petal-shaped protrusions are arranged in a staggered annular array, and the tip direction of the petal-shaped protrusions is consistent with the gas-liquid flow direction;

[0029] The lower semicircular radius of the petal-shaped protrusion is R1, and the upper tip is formed by the intersection of two first arcs with radii of R2 and a second arc with a radius of R3;

[0030] The petal-shaped protrusions include two types, A and B;

[0031] In the A-type petal-shaped protrusion, the first arc is a part of the arc formed by the midpoint of the electrolyte inlet, the end point of the lower semicircle of the petal-shaped protrusion close to the center of the flow channel, and the midpoint of the gas-liquid outlet;

[0032] In the A-type petal-shaped protrusion, the center O of the first arc 2 At the same height as the center point of the flow channel;

[0033] In the A-type petal-shaped protrusion, the intersection of the first arc and the horizontal line where the center point of the flow channel is located is at a distance W from the center point of the flow channel, W>0,0 <R1≤200mm;

[0034] In the A-type petal-shaped protrusion, the center O of the first arc 2 , the center of the second arc O 3 and the center of the semicircle O 1 On the same straight line, and R1 <R3<R2;

[0035] In the A-type petal-shaped protrusion, the first arc extends from the endpoint of the lower semi-circular part of the petal-shaped protrusion near the center of the flow channel towards the midpoint of the gas-liquid outlet, and its central angle φ1 is 1°-20°;

[0036] In the A-type petal-shaped protrusion, the second arc starts from the endpoint of the lower semi-circular part of the petal-shaped protrusion far from the center of the flow channel and intersects with the arc with a radius of R2;

[0037] The A-type petal-shaped protrusions are arranged in an annular array; for any one of the protrusions, an annular array is made in the counterclockwise or clockwise direction. The center point of the annular array is the center of the first arc contained in the protrusion, and the central angle φ2 between the array units is 1°-30°, and the total number n of the array units is 1-20;

[0038] The annular array of the A-type petal-shaped protrusions takes the center of the first arc in the petal-shaped protrusion it contains as the center, and rotates φ3 by 0-45° clockwise or counterclockwise along the horizontal line of the flow channel center as the starting edge;

[0039] Several groups of annular arrays of A-type petal-shaped protrusions are distributed in the flow channel, and the number of array groups is adjustable;

[0040] In the B-type petal-shaped protrusion, the center of the lower semi-circular part of the protrusion is located on the midline of the gas-liquid inlet and outlet, and the distance between the center and the flow channel center is W;

[0041] In the B-type petal-shaped protrusion, the centers of the first arc and the second arc are respectively located on both sides of the center of the semi-circular part, and are at the same height as the center of the lower semi-circular part of the petal-shaped protrusion;

[0042] In the B-type petal-shaped protrusion, the first arc and the second arc start from the endpoints on both sides of the lower semi-circular part of the petal-shaped protrusion and extend in the gas-liquid flow direction;

[0043] In the B-type petal-shaped protrusion, R1 < R2 = R3, and R2 is 5R1-30R1;

[0044] Several B-type petal-shaped protrusions are distributed on the midline of the gas-liquid inlet and outlet. The distance between the longitudinal tip vertices of two adjacent B-type petal-shaped protrusions is L, L is 5R1-30R1, and the total number n of the B-type petal-shaped protrusions is 1-20;

[0045] Petal-shaped array flow fields are provided on both sides of the electrode plate.

[0046] The petal-shaped protrusion includes a protrusion top surface and a protrusion wall surface, and an arc transition surface is provided between the protrusion top surface and the protrusion wall surface.

[0047] 1-5 gas-liquid outlets are provided on the outer ring frame, and the midline of the gas-liquid outlets is the midline of the sector occupied by all the gas-liquid outlets.

[0048] like Figures 2 to 5 As shown, an electrode plate with a petal-shaped array flow field, wherein the outer ring frame 1 is provided with a gas-liquid outlet 2 and an electrolyte inlet 8, and is also provided with a sunken step 3 and a sealing waterline 4 for placing a diaphragm material and an electrode material.

[0049] The petal-shaped array flow field plate 5 is provided with a petal-shaped array flow channel 12 composed of a staggered arrangement of A-type petal-shaped protrusions 6 and B-type petal-shaped protrusions 7 to form a flow field space. Both sides are provided with a petal-shaped flow field, a gas-liquid outlet for hydrogen and oxygen separation, and an electrolyte inlet, which can realize a filter-press layout electrolysis chamber combination structure.

[0050] Petal-shaped array flow fields are arranged on both sides of the electrode plate 5, including type A petal-shaped protrusions 6, type B petal-shaped protrusions 7 and petal-shaped array flow channels 12 formed between the protrusions; the type A petal-shaped protrusions 6 are arranged in a staggered manner in a plurality of annular arrays, and the type B petal-shaped protrusions 7 are arranged at equal intervals on the midline between the gas-liquid outlet and the electrolyte inlet, and the tip directions of the type A petal-shaped protrusions 6 and the type B petal-shaped protrusions 7 are consistent with the gas-liquid flow direction; the type A petal-shaped protrusions 6 and the type B petal-shaped protrusions 7 include protrusion top surfaces and protrusion wall surfaces, and an arc transition surface is provided between the protrusion top surfaces and the protrusion wall surfaces.

[0051] The outer ring frame and the petal-shaped array flow field electrode plate can be processed by a variety of methods such as integrated mold method, stamping and welding method, etc. The tip direction of the petal-shaped protrusion of the unique petal-shaped array flow field should be consistent with the gas-liquid flow direction in the electrolysis chamber. According to the requirements of the implementation method, the overall size of the electrode plate can be adaptively adjusted to meet the diversified design of the electrolytic cell structure.

[0052] like Figure 4 As shown, in this embodiment, the technical parameters of the petal-shaped flow channel are: the radius of the electrode plate is 600mm; from the center of the flow channel to the outer edge of the flow channel, there are 10 groups of A-type petal-shaped protrusion annular arrays on both sides of the midline between the gas-liquid outlet and the electrolyte inlet. The 5 groups of A-type petal-shaped protrusion arrays on one side of the flow channel are the mirror images of the 5 groups of A-type petal-shaped protrusion arrays on the other side with the midline as the mirror line, among which the first and fourth groups of petal-shaped protrusions on the right side include some technical parameters as shown in FIG. Figure 7 As shown; at the same time, there are three B-type petal-shaped protrusions with equal spacing distributed on the midline of the gas-liquid inlet and outlet;

[0053] The technical parameters of the first group of A-type petal-shaped raised annular arrays are: W=100mm, R1=25mm, R3=250mm, φ1=5°, φ2=10°, φ3=0, n=3;

[0054] The technical parameters of the second group A-type petal-shaped raised annular array are: W=200mm, R1=25mm, R3=250mm, φ1=10°, φ2=15°, φ3=5°, n=3;

[0055] The technical parameters of the third group A-type petal-shaped raised annular array are: W=300mm, R1=25mm, R3=250mm, φ1=13°, φ2=25°, φ3=0, n=3;

[0056] The technical parameters of the fourth group A-type petal-shaped raised annular array are: W=400mm, R1=25mm, R3=250mm, φ1=16°, φ2=25°, φ3=10°, n=3;

[0057] The technical parameters of the fifth group A-type petal-shaped raised annular array are: W=500mm, R1=25mm, R3=250mm, φ1=17°, φ2=30°, φ3=0, n=3;

[0058] On the midline, the distance between the longitudinal tip vertices of two adjacent B-type petal-shaped protrusions 7 is L=255mm, wherein the distance between the center of the lower semicircle of the B-type petal-shaped protrusion 7 above the center point of the flow channel and the center of the flow channel is W=90mm, and the total number of B-type petal-shaped protrusions n=3.

[0059] When the above technical solution is used, the electrolyte enters the flow field space from the electrolyte inlet 8 in the center line direction driven by the external circulation pump, and the petal-shaped protrusion array flow channel 12 matching the direction of the inlet and outlet will divert the inlet electrolyte, increase the electrolyte flow rate, accelerate along the longitudinal staggered protrusions, and drive the bubbles generated by electrolysis to quickly detach from the electrode surface; the simulation results show that the unique protrusion array will directionally accelerate the gas-liquid mixed flow generated during the electrolysis process, effectively reducing the kinetic energy weakening caused by the vortex generated by the chaotic Karman vortex street effect in the mixed flow. The gas-liquid mixed flow is finally discharged from the flow field through the gas-liquid outlet 2 and converged into the external pipeline to form a cycle.

[0060] It can be understood that the above specific description of the utility model is only used to illustrate the utility model and is not limited to the technical solution described in the implementation mode of the utility model. Ordinary technicians in the field should understand that the utility model can still be modified or replaced by equivalents to achieve the same technical effect; as long as the use requirements are met, they are within the protection scope of the utility model.

Claims

1. A water electrolysis plate with a petal-shaped array flow field, comprising an outer ring frame and a sealing water line, characterized in that: The outer ring frame is provided with a gas-liquid outlet and an electrolyte inlet. Electrodes are arranged inside the outer ring frame, and petal-shaped array channels are arranged on the electrodes. The petal-shaped array flow field includes petal-shaped protrusions and the array channels formed between the protrusions. The petal-shaped protrusions are arranged in a staggered circular array, and the tip direction of the petal-shaped protrusions is consistent with the gas-liquid flow direction. The lower part of the petal-shaped protrusion adopts a semi-circular arc with a radius of R1, and the upper tip is formed by the intersection of a first arc with a radius of R2 and a second arc with a radius of R3. The petal-shaped protrusions include two types: A-type petal-shaped protrusions and B-type petal-shaped protrusions.

2. The water electrolysis plate having a petal-shaped array flow field according to claim 1, characterized in that: In the A-type petal-shaped protrusions, the centers of the first arc, the second arc and the semi-circular arc are on the same straight line, and R1 < R3 < R2; the central angle φ1 of the first arc is 1° - 20°.

3. The water electrolysis plate having a petal-shaped array flow field according to claim 2, characterized in that: The A-type petal-shaped protrusions are arranged in a circular array, the central angle φ2 between the array units is 1° - 30°, and the total number n of the array units is 1 - 20.

4. The water electrolysis plate with a petal-shaped array flow field according to claim 3, characterized in that: Adjacent circular arrays are arranged in a staggered manner.

5. The water electrolysis plate with a petal-shaped array flow field according to claim 1, characterized in that: In the B-type petal-shaped protrusions, the centers of the first arc, the second arc and the semi-circular arc are on the same straight line, and the centers of the first arc and the second arc are on both sides of the center of the semi-circular arc, R1 < R2 = R3, and R2 is 5R1 - 30R1.

6. The water electrolysis plate having a petal-shaped array flow field according to claim 5, characterized in that: The B-type petal-shaped protrusions are distributed on the midline of the gas-liquid outlet and the electrolyte inlet. The distance L between the longitudinal tip vertices of two adjacent B-type petal-shaped protrusions is 5R1 - 30R1, and the total number n of the B-type petal-shaped protrusions is 1 - 20.

7. The water electrolysis plate with a petal-shaped array flow field according to claim 1, characterized in that: Petal-shaped array flow fields are provided on both sides of the electrode.

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