Pole frame pole plate capable of uniformizing flow field, electrolytic bath and application of pole frame pole plate

Abstract

The invention belongs to the technical field of electrolysis devices, and particularly relates to a pole frame pole plate capable of uniformizing a flow field, an electrolytic bath and application thereof. The liquid distribution channels distributed in the radial shape are arranged on the electrode frame, and the effect of preliminarily dispersing the solution is achieved. The first guide plate and the second guide plate are arranged on the front surface of the polar plate near the solution outlet, so that the flow velocity of alkali liquor on two sides of the electrolysis chamber is increased, and the formation of flowing retention areas is reduced. The turbulent flow units are arranged in a hexagonal prism and hexagonal pyramid combined shape, so that the transverse and longitudinal distribution of the solution can be better balanced, the concentration distribution of the solution is more uniform, the use energy consumption of the electrolytic cell is reduced, and the energy utilization rate is improved. The connecting through hole is formed outside the pole frame, and the end plate and the pole frame pole plate are connected through the mounting positioning column and the connecting through hole, so that the pole frame pole plate, the gasket and the central axis of the end plate are positioned on the same parallel line in the mounting process, and a liquid inlet and a gas-liquid outlet keep good sealing performance.

Description

Technical Field

[0001] The invention belongs to the technical field of electrolytic devices, and in particular relates to an electrode frame and an electrode plate capable of achieving a uniform flow field, an electrolytic cell and applications thereof. Background Art

[0002] With the continuous growth of global energy demand and the enhancement of environmental protection awareness, the use of traditional fossil energy faces severe challenges. In this context, hydrogen energy, as a clean and efficient energy carrier, is gradually becoming an important direction for energy transformation. Hydrogen energy not only has zero emissions as its combustion product, but also has a wide range of sources and can be produced through a variety of ways. Among them, alkaline water hydrogen electrolyzers, as key equipment for producing hydrogen through the process of water electrolysis using renewable energy (such as solar energy and wind energy), are receiving widespread attention. This technology decomposes water into hydrogen and oxygen through the electrolysis process, providing a sustainable hydrogen supply solution for the hydrogen energy industry and promoting the green transformation of the global energy structure.

[0003] The core components of the alkaline water hydrogen production electrolyzer include the pole frame and the pole plate, which play a vital role in the electrolysis process. As the supporting structure of the electrolyzer, the pole frame is not only responsible for the distribution of electrolyte and the collection of gas, but also ensures the separation of the cathode and anode areas inside the electrolyzer, preventing the mixing of electrolytes. The pole plate is the main place for the electrolysis reaction, and its surface is covered with a special concave-convex structure to optimize the flow of electrolyte and electrolysis efficiency. The close cooperation between the pole plate and the pole frame realizes an efficient electrolysis process inside the electrolyzer, reduces energy consumption and increases hydrogen production. However, there are still major problems in the current use of pole frames and pole plates. Mastoid pole plates and in-line liquid distribution channels are a widely used combination. The concave-convex design can better fix the electrodes and diaphragms. However, this method also makes the fluidity distribution of the alkali solution in the electrolytic chamber poor. Most of the alkali solution is mainly distributed in the middle of the pole plate. There are flow retention areas on both sides of the chamber. The in-line liquid distribution channels cannot effectively transport the alkali solution to both sides, resulting in a large difference in the concentration distribution of the alkali solution in the electrolytic chamber, reducing the electrolysis efficiency. In addition, since there are no positioning holes when installing the traditional circular pole frame, multiple chambers are misaligned during installation, which increases the probability of leakage in the electrolytic cell.

[0004] Patent CN202223411568.1 discloses an integrated alkaline electrolytic cell bipolar plate, in which an intermediate plate is arranged at the center of the bipolar plate body, and a number of plate bosses are arranged on the intermediate plate, and an alkali liquid flow field is distributed between the plate bosses, and a plate frame is arranged around the outer periphery of the intermediate plate, and an alkali liquid inlet, a hydrogen outlet and an oxygen outlet are arranged on the plate frame. The alkali liquid flow field area on the intermediate plate is relatively wide, and the alkali liquid flows through the linearly arranged plate bosses on the intermediate plate, and the flow channel is smoother, which reduces the contact resistance and improves the current density. In this scheme, the plate boss structure is evenly distributed on the plate, but there is no staggered distribution, which reduces the lateral distribution capacity of the alkali liquid, and the alkali liquid cannot be transported to both sides of the electrolysis chamber in time, resulting in the presence of flow retention areas on both sides, which increases the electrolysis energy consumption. Since the generated heat cannot be transferred in time, the service life of the electrolytic cell is reduced.

[0005] Patent CN202211328849.2 discloses a pole frame, an electrolytic cell, an alkaline water electrolysis system and an alkaline water electrolysis method. The pole frame is provided with a plurality of through holes, the plurality of through holes are located on the same circumference and include a raw material inlet and a gas-liquid outlet, the raw material inlet and the gas-liquid outlet are located on different sides of the pole frame, the coolant inlet is arranged near the gas-liquid outlet, and the coolant outlet is arranged near the raw material inlet. During the operation of the electrolytic cell, the coolant flows into the cooling channel from the coolant inlet, and the pole frame is cooled during the coolant flowing through the cooling channel, and then flows out from the coolant outlet. The continuous introduction of the coolant can cool the pole frame and reduce the degree of expansion of the pole frame due to high temperature. However, there are a plurality of cooling channels in the pole frame, which can cool the electrolytic cell in operation, but the pole frame and the gasket cannot be fully aligned during the installation process, and it is easy to have a misalignment phenomenon, which will cause deviations in the inlet and outlet of the electrolytic cell, increase the probability of leakage, reduce the service life of the electrolytic cell, and increase the energy consumption of electrolysis.

[0006] Patent 202310870604.0 discloses a main electrode plate of a hydrogen production electrolyzer, a manufacturing method thereof, and a hydrogen production electrolyzer. The main electrode plate includes an electrolysis reaction zone and an outer frame zone. The outer frame zone is integrally connected to the outside of the electrolysis reaction zone. The electrolysis reaction zone includes a planar electrode plate and a support protrusion integrally arranged on the planar electrode plate. The support protrusion constitutes a support lattice for supporting an active electrode mesh. The outer frame zone includes an outer sealing zone and an inner sealing zone. The inner sealing zone is a planar structure. The inner sealing zone is provided with an electrolyte inlet and an air outlet. The outer sealing zone is provided with a sealing water line. After the electrolyzer is assembled, an electrolysis reaction occurs in the electrolysis reaction zone. The active electrode mesh is supported by the support protrusion to compress the diaphragm cloth. Welding and stamping are no longer required. There will be no welding defects or plate coating defects caused by welding defects. Local corrosion and perforation of the electrolyzer are effectively avoided, and the service life of the electrolyzer is improved. However, the liquid distribution channels connecting the electrode frame and the electrolytic chamber are arranged in a straight line, so that the electrolyte flows from the middle part of the electrode plate to the outlet, with less flow to the two sides and poor flow uniformity, resulting in uneven distribution of electrolyte concentration, leading to a continuous increase in electrolysis energy consumption and a decrease in electrolysis efficiency. Summary of the invention

[0007] In view of the problems existing in the prior art, the present invention provides a pole frame and pole plate capable of achieving a uniform flow field, an electrolytic cell and applications thereof, and the present invention specifically includes the following contents:

[0008] A pole frame and pole plate capable of uniform flow field, wherein the pole frame is an annular structure or a similar annular structure, the pole frame is sleeved on the periphery of the pole plate, the top of the side of the pole frame is higher than the pole plate (i.e., the pole frame is thicker than the pole plate), the top of the side of the pole frame contacts the edge of the electrode sheet, an electrolysis chamber is formed between the pole frame and the electrode sheet, and the pole plate includes a front and a back, the front of the pole plate is the side where the electrolysis chamber is located, and the back is the side of the pole plate opposite to the front. In the present invention, the inner circle connecting the pole frame and the pole plate is called the inner side of the pole frame, and the outer circle not connected to the pole plate is called the outer side of the pole frame. A solution inlet is provided on the outer side of the pole frame, and a liquid distribution channel is provided in the pole frame that runs through the inner and outer sides of the pole frame, one end of the liquid distribution channel is connected to the solution inlet, and the other end is connected to the side where the front of the pole plate is located (i.e., the electrolysis chamber);

[0009] The liquid distribution channel includes a plurality of liquid distribution channels radially distributed from the outside of the pole frame to the inside of the pole frame, and the ends of the plurality of liquid distribution channels close to the outside of the pole frame converge and overlap at the solution inlet, and the ends of the plurality of liquid distribution channels close to the inside of the pole frame point to the front of the pole plate in different directions respectively; the function of the liquid distribution channel is to drain the solution flowing into the solution inlet into the electrolysis chamber. The present invention provides a plurality of liquid distribution channels pointing in different directions, the purpose of which is to introduce the solution into all directions of the electrolysis chamber, so as to play a role in preliminary dispersion of the solution;

[0010] The front of the electrode plate is provided with a plurality of first guide plates, a second guide plate, and a plurality of raised spoiler units. The plurality of first guide plates are respectively arranged on the front of the electrode plate outside the inner outlets of the plurality of liquid distribution channels. The first guide plate is arranged along the straight line where the corresponding liquid distribution channel is located (preferably, the center line of the first guide plate coincides with the straight line where the center line of the liquid distribution channel is located); the second guide plate is a "V"-shaped guide plate, which is arranged on the front of the electrode plate and symmetrically arranged along the center line of the solution inlet. The guide plate is vertically connected to the front of the electrode plate, the height of the electrode plate is not higher than the height of the spoiler unit, the length of the electrode plate cannot be too long, otherwise it will block the lateral distribution of the solution at the location of the electrode plate, and the length of the electrode plate cannot be too short, otherwise it is difficult to play the role of guiding. Preferably, the length of the electrode plate is 2-3 times the width of the spoiler unit. The present invention creatively arranges a first guide plate and a second guide plate on the front of the electrode plate near the solution outlet, and limits the first guide plate to be arranged along the straight line where the liquid distribution channel is located. The first guide plate can guide the solution flowing out of the liquid distribution channel, so that it flows evenly in all directions of the electrolysis chamber. The center line of the first guide plate is arranged to coincide with the straight line where the center line of the liquid distribution channel is located. The solution coming out of the liquid distribution channel is evenly divided into two streams by the first guide plate, and flows to the two sides of the first guide plate respectively, which can further promote the uniform distribution of the solution. In addition, the present invention also arranges a "V"-shaped guide plate in the middle of multiple first guide plates, and limits it to be symmetrically arranged along the center line of the solution inlet, because the solution in the electrolysis chamber is always easy to gather at the center of the electrode plate, and the "V"-shaped guide plate can effectively prevent the solution from gathering at the center position when it just enters the electrolysis chamber, which can alleviate or avoid the problem of excessive center solution to a certain extent.

[0011] The spoiler unit includes a first section and a second section, the first section is a hexagonal prism, and the first section is vertically connected to the front of the electrode plate; the second section is arranged at the upper end of the first section, and the second section is a hexagonal pyramid with rounded corners at the top, and the first section and the second section are smoothly connected. The present invention sets the spoiler unit in the shape of a combination of a hexagonal prism and a hexagonal pyramid. The structural feature of the hexagonal prism is that the cross section (i.e., the liquid inlet direction) is a hexagon, the width of the two ends of the hexagon is small, the middle width is large, and each side is a straight line. When the liquid is inlet, the solution contacts one of the sides or one of the corners of the hexagonal prism, and under the drainage effect of the side of the hexagonal prism, it will gradually disperse first. When it is dispersed to the widest position, part of the solution will detach from the hexagonal prism under the action of inertia and disperse outward (lateral distribution), and the other part will continue to converge along the side of the hexagonal prism to the other side, and then flow to the next hexagonal prism (longitudinal distribution). Therefore, compared with other shapes of spoiler units such as cylindrical, elliptical, and triangular prisms, the hexagonal spoiler unit can better balance the lateral and longitudinal distribution of the solution and achieve the effect of uniform flow field. The top of the spoiler unit is set to a hexagonal pyramid, and the vertex is rounded, the purpose is to make the spoiler unit contact with the electrode more closely and increase the contact area between the alkali solution and the electrode, improve the electrolysis efficiency, and make the bubbles generated by the electrode leave the electrode surface in time, reduce the electrolysis internal resistance, and the spoiler unit with rounded corners can better protect the electrode surface, so as not to affect the stable operation of the electrolysis reaction.

[0012] Preferably, the number of the liquid distribution channels is not less than three; and the angle between two adjacent liquid distribution channels is 15°-55°.

[0013] Preferably, when the number of liquid distribution channels is an even number, the number of first guide plates is two less than the number of liquid distribution channels, and except for the two middle liquid distribution channels, a first guide plate is correspondingly arranged outside the outlet of each liquid distribution channel; the "V"-shaped guide plate is arranged outside the two middle liquid distribution channels.

[0014] Preferably, when the number of liquid distribution channels is odd, the number of first guide plates is one less than the number of liquid distribution channels, and except for the middle liquid distribution channel, a first guide plate is correspondingly arranged outside the outlet of each liquid distribution channel; the "V"-shaped guide plate is arranged outside the middle liquid distribution channel.

[0015] Preferably, the number of the liquid distribution channels is three.

[0016] Preferably, the plurality of flow spoilers are evenly distributed on the front of the electrode plate, and are staggered between any two adjacent rows of flow spoilers; gaps are left between the adjacent flow spoilers to form mutually interpenetrating solution flow channels; the solution flow channels are interpenetrating with the liquid distribution channels. The even distribution mentioned here means even distribution in all directions, and the staggered distribution means that any two adjacent horizontal, vertical, or oblique rows of flow spoilers are staggered, that is, the gaps between the flow spoilers in the rear row and the adjacent two flow spoilers in the front row are aligned, which can avoid solution convergence and achieve a better dispersion effect.

[0017] Preferably, the pole plate is a circular plate, and the diameter of the circular plate is 160-800mm; and / or the bottom widths of the first section and the second section of the spoiler unit are both 5-15mm, and the total height of the spoiler unit is 3-9mm; and / or the ratio of the height of the first section and the second section of the spoiler unit is 1:(0.5-1); and / or the center distance between two adjacent spoiler units is 8-25mm.

[0018] Preferably, a plurality of fixed installation connection blocks are further provided on the outer edge of the pole frame, and connection through holes are provided on the fixed installation connection blocks.

[0019] Preferably, the number of the fixed installation connection blocks is four, and the four fixed installation connection blocks are evenly distributed in the circumferential direction of the outer edge of the pole frame.

[0020] An electrolytic cell, comprising two end plates, a plurality of pole frame plates, a plurality of gaskets, and a plurality of mounting and positioning columns, wherein the pole frame plates are the pole frame plates capable of uniform flow field as described in claim 7, and mounting through holes are arranged at positions on the end plates corresponding to the connecting through holes of the pole frame, and the end plates and the pole frame plates are connected by mounting and positioning columns passing through the mounting through holes and the connecting through holes. The present invention arranges connecting through holes outside the pole frame, and connects the end plates and the pole frame plates by mounting and positioning columns and connecting through holes, so that the entire electrolytic cell can be kept in a vertical state, the deviation in the process of assembling the electrolytic cell can be reduced, and the leakage caused by the deviation can be reduced, thereby improving the electrolysis efficiency of the electrolytic cell.

[0021] An application of the electrolyzer in producing hydrogen from alkaline water.

[0022] Beneficial effects of the present invention:

[0023] (1) The present invention provides a plurality of liquid distribution channels on the pole frame that are radially distributed from the outside of the pole frame to the inside of the pole frame. The ends of the plurality of liquid distribution channels close to the outside of the pole frame converge and overlap at the solution inlet, and the ends of the plurality of liquid distribution channels close to the inside of the pole frame point to the front of the pole plate in different directions. The function of the liquid distribution channels is to drain the solution flowing into the solution inlet into the electrolysis chamber. The present invention provides a plurality of liquid distribution channels pointing in different directions, the purpose of which is to introduce the solution into all directions of the electrolysis chamber, so as to achieve the effect of initially dispersing the solution.

[0024] (2) The present invention creatively sets a first guide plate and a second guide plate on the front of the electrode plate near the solution outlet, and limits the first guide plate to be set along the straight line where the liquid distribution channel is located. The first guide plate can guide the solution flowing out of the liquid distribution channel, so that it flows evenly in all directions of the electrolysis chamber. The center line of the first guide plate is set to coincide with the straight line where the center line of the liquid distribution channel is located. The solution coming out of the liquid distribution channel is evenly divided into two streams by the first guide plate, and flows to the two sides of the first guide plate respectively, which can further promote the uniform distribution of the solution. In addition, the present invention also sets a "V"-shaped guide plate in the middle of multiple first guide plates, and limits it to be symmetrically set along the center line of the solution inlet. Because the solution in the electrolysis chamber is always easy to gather at the center of the electrode plate, the "V"-shaped guide plate can effectively prevent the solution from gathering at the center position when it just enters the electrolysis chamber, which can alleviate or avoid the problem of excessive solution in the center to a certain extent. The first guide plate and the second guide plate increase the flow rate of the alkali solution on both sides of the electrolytic chamber, reduce the formation of flow retention areas, and avoid local high temperatures generated between the electrodes and the plates, thereby extending the service life of the electrolytic cell.

[0025] (3) The present invention sets the spoiler unit in the shape of a combination of a hexagonal prism and a hexagonal pyramid. The structural feature of the hexagonal prism is that the cross-section (i.e., the direction of liquid inlet) is a hexagon, the width of the two ends of the hexagon is small, the width in the middle is wide, and all the sides are straight. When the liquid is inlet, the solution contacts one of the side surfaces or one of the corners of the hexagonal prism, and under the drainage effect of the side surface of the hexagonal prism, it will gradually disperse. When it is dispersed to the widest position, part of the solution will separate from the hexagonal prism under the action of inertia and disperse outward (lateral distribution), and the other part will continue to converge along the side surface of the hexagonal prism to the other side, and then flow to the next hexagonal prism (longitudinal distribution). Therefore, compared with the spoiler units of other shapes such as cylindrical, elliptical, triangular prism, and papillary, the front end of the hexagonal prism spoiler unit can divert the inflow of alkali solution, and the two adjacent rows of spoiler units are staggered, which can further enhance the lateral distribution ability of the alkali solution in the electrolysis chamber. The spoiler unit of the present invention can better balance the lateral and longitudinal distribution of the solution, make the solution concentration distribution more uniform, reduce the energy consumption of the electrolytic cell, and improve energy utilization.

[0026] (4) The present invention sets a connecting through hole outside the pole frame, and connects the end plate and the pole frame plate by installing a positioning column and the connecting through hole, so as to ensure that the central axes of the pole frame plate, the gasket and the end plate are in the same parallel line during the installation process, so that the liquid inlet and the gas-liquid outlet maintain good sealing, reduce the occurrence of leakage, increase the safety of the electrolytic cell, and improve the electrolysis efficiency of the electrolytic cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the pole frame and pole plate structure capable of uniform flow field disclosed in the present invention;

[0028] Figure 2 It is a structural schematic diagram of the spoiler unit disclosed in the present invention;

[0029] Figure 3 A schematic diagram of the flow field using the pole frame and pole plate disclosed in the present invention;

[0030] Figure 4 It is a schematic diagram of the installation of the electrolytic cell disclosed in the present invention;

[0031] Figure 5 Schematic diagram of the flow field of Comparative Example 1 of the present invention;

[0032] Figure 6 Schematic diagram of the flow field of Comparative Example 2 of the present invention;

[0033] Figure 7 Schematic diagram of the flow field of Comparative Example 3 of the present invention;

[0034] Figure 8 It is a comparison diagram of the flow velocity at the center of the electrode plate of the embodiment of the present invention and the comparative example 1;

[0035] Fig. 9 It is a comparison diagram of the flow field uniformity coefficient of the embodiment of the present invention and the comparative example 1. DETAILED DESCRIPTION

[0036] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments shown below do not limit the invention content described in the claims. In addition, the entire contents of the structures represented by the following embodiments are not limited to those necessary as solutions to the invention described in the claims.

[0037] Reference Figure 1-3, a pole frame and pole plate capable of uniform flow field, the pole frame 1 is an annular structure or a similar annular structure, the pole frame 1 is sleeved on the periphery of the pole plate 2, the top of the side of the pole frame 1 is higher than the pole plate 2 (that is, the pole frame 1 is thicker than the pole plate 2), the top of the side of the pole frame 1 contacts the edge of the electrode sheet, and an electrolysis chamber is formed between the pole frame 1 and the electrode sheet, the pole plate 2 includes a front and a back, the front of the pole plate 2 is the side where the electrolysis chamber is located, and the back is the side of the pole plate 2 opposite to the front. In the present invention, the inner circle connecting the pole frame 1 and the pole plate 2 is called the inner side of the pole frame 1, and the outer circle not connected to the pole plate 2 is called the outer side of the pole frame 1. A solution inlet 4 is arranged on the outside of the pole frame 1, and a liquid distribution channel 5 is arranged in the pole frame 1, which passes through the inside and outside of the pole frame 1. One end of the liquid distribution channel 5 is connected to the solution inlet 4, and the other end is connected to the side where the front of the pole plate 2 is located (i.e., the electrolysis chamber). The liquid distribution channel 5 includes a plurality of liquid distribution channels 5 radially distributed from the outside of the pole frame 1 to the inside of the pole frame 1. The ends of the plurality of liquid distribution channels 5 close to the outside of the pole frame 1 converge and overlap at the solution inlet 4, and the ends of the plurality of liquid distribution channels 5 close to the inside of the pole frame 1 are respectively directed to the front of the pole plate 2 in different directions; the function of the liquid distribution channel 5 is to drain the solution flowing in from the solution inlet 4 into the electrolysis chamber. The present invention provides a plurality of channels pointing in different directions. The liquid distribution channel 5 is designed to introduce the solution into all directions of the electrolysis chamber, and play a role in the preliminary dispersion of the solution; the front of the electrode 2 is provided with a plurality of first guide plates 6, a second guide plate 7, and a plurality of raised spoiler units 3, the plurality of first guide plates 6 are respectively arranged on the front of the electrode 2 outside the inner outlet of the plurality of liquid distribution channels 5, and the first guide plate 6 is arranged along the straight line where the corresponding liquid distribution channel 5 is located (preferably, the center line of the first guide plate 6 coincides with the straight line where the center line of the liquid distribution channel 5 is located); the second guide plate 7 is a "V"-shaped guide plate, which is arranged on the front of the electrode 2 and symmetrically arranged along the center line of the solution inlet 4. The guide plate is vertically connected to the front of the electrode 2, the height of the electrode 2 is not higher than the height of the spoiler unit, the length of the electrode 2 cannot be too long, otherwise it will block the lateral distribution of the solution at the location of the electrode 2, and the length of the electrode 2 cannot be too short, otherwise it is difficult to play the role of guiding, preferably, the length of the electrode 2 is 2-3 times the width of the spoiler unit 3. The present invention creatively arranges a first guide plate 6 and a second guide plate 7 on the front side of the electrode plate 2 near the solution outlet, and limits the first guide plate 6 to be arranged along the straight line where the liquid distribution channel 5 is located. The first guide plate 6 can guide the solution flowing out of the liquid distribution channel 5, so that it flows evenly in all directions of the electrolysis chamber. The center line of the first guide plate 6 is arranged to coincide with the straight line where the center line of the liquid distribution channel 5 is located. The solution coming out of the liquid distribution channel 5 is evenly divided into two liquid flows by the first guide plate 6, and flows to the two sides of the first guide plate 6 respectively, which can further promote the uniform distribution of the solution.In addition, the present invention further provides a "V"-shaped flow guide plate in the middle of the plurality of first flow guide plates 6, and limits the symmetrical arrangement thereof along the center line of the solution inlet 4, because the solution in the electrolysis chamber is always easy to gather at the center of the electrode plate 2, and the "V"-shaped flow guide plate can effectively prevent the solution from gathering at the center position just after entering the electrolysis chamber, which can alleviate or avoid the problem of excessive solution in the center to a certain extent. The flow disturbance unit 3 includes a first section 31 and a second section 32, wherein the first section 31 is a hexagonal prism, and the first section 31 is vertically connected to the front of the electrode plate 2; the second section 32 is arranged at the upper end of the first section 31, and the second section 32 is a hexagonal pyramid with rounded corners at the top, and the first section 31 and the second section 32 are smoothly connected. The present invention arranges the flow disturbance unit 3 into the shape of hexagonal prism and hexagonal pyramid combination, the structural feature of hexagonal prism is that cross section (i.e. liquid inlet direction) is hexagonal, the width of both ends of hexagonal is small, the middle wide band is large, and each side is straight line, during liquid inlet, solution contacts one of the sides or one of the angles of hexagonal prism, under the drainage effect of the hexagonal prism side, can be gradually dispersed first, when dispersed to the widest position, part of the solution can be separated from the hexagonal prism under inertia and dispersed outwards (lateral distribution), another part can continue to converge along the side of the hexagonal prism to its other side, then flow to the next hexagonal prism (vertical distribution). Therefore, compared to the flow disturbance unit 3 of other shapes such as cylindrical, elliptical cylinder, triangular prism, hexagonal prism flow disturbance unit 3 can better balance the lateral and longitudinal distribution of solution, reach the effect of uniform flow field. The top of flow disturbance unit 3 is arranged into hexagonal pyramid, and filleting is carried out to vertex, and purpose is.

[0038] In one embodiment of the present invention, the number of the liquid distribution channels 5 is not less than three; and the angle between two adjacent liquid distribution channels 5 is 15°-55°.

[0039] In one embodiment of the present invention, when the number of liquid distribution channels 5 is an even number, the number of first guide plates 6 is two less than the number of liquid distribution channels 5, and except for the two middle liquid distribution channels 5, a first guide plate 6 is correspondingly arranged outside the outlet of each liquid distribution channel 5; the "V"-shaped guide plate is arranged outside the two middle liquid distribution channels 5.

[0040] In one embodiment of the present invention, when the number of liquid distribution channels 5 is odd, the number of first guide plates 6 is one less than the number of liquid distribution channels 5, and except for the middle liquid distribution channel 5, a first guide plate 6 is correspondingly arranged outside the outlet of each liquid distribution channel 5; the "V"-shaped guide plate is arranged outside the middle liquid distribution channel 5.

[0041] In one embodiment of the present invention, the number of the liquid distribution channels 5 is three.

[0042] In one embodiment of the present invention, the plurality of flow spoilers 3 are evenly distributed on the front of the electrode plate 2, and are staggered between any two adjacent rows of flow spoilers 3; gaps are left between the adjacent flow spoilers 3 to form mutually interpenetrating solution flow channels; the solution flow channels are interpenetrating with the liquid distribution channel 5. The even distribution mentioned here means even distribution in all directions, and the staggered distribution means that any two adjacent horizontal, vertical, or oblique rows of flow spoilers 3 are staggered, that is, the gaps between the flow spoilers 3 in the rear row and the adjacent two flow spoilers 3 in the front row are aligned, so that the solution can be prevented from converging and a better dispersion effect can be achieved.

[0043] In one embodiment of the present invention, the pole plate 2 is a circular plate, and the diameter of the circular plate is 160-800mm; and / or the bottom widths of the first section 31 and the second section 32 of the spoiler unit are both 5-15mm, and the total height of the spoiler unit 3 is 3-9mm; and / or the ratio of the height of the first section 31 and the second section 32 of the spoiler unit is 1:(0.5-1); and / or the center distance between two adjacent spoiler units 3 is 8-25mm.

[0044] In one embodiment of the present invention, a plurality of fixed installation connection blocks are further provided on the outer edge of the pole frame 1. Preferably, the fixed installation connection blocks are integrally formed with the edge of the pole frame 1, and connection through holes 8 are provided on the fixed installation connection blocks.

[0045] In one embodiment of the present invention, the number of the fixed installation connection blocks is four, and the four fixed installation connection blocks are evenly distributed in the circumferential direction of the outer edge of the pole frame 1 .

[0046] Reference Figure 4 An electrolytic cell includes two end plates 9, a plurality of pole frame plates, a plurality of gaskets, and a plurality of mounting and positioning columns 10. The pole frame plates are the pole frame plates capable of uniform flow field as described in claim 7. The end plates 9 are provided with mounting through holes at positions corresponding to the connecting through holes 8 of the pole frame 1. The end plates 9 and the pole frame plates are connected by mounting and positioning columns 10 passing through the mounting through holes and the connecting through holes 8. In the present invention, the connecting through holes 8 are provided outside the pole frame 1, and the end plates 9 and the pole frame plates are connected by the mounting and positioning columns 10 and the connecting through holes 8, so that the entire electrolytic cell can be kept in a vertical state, the deviation in the process of assembling the electrolytic cell can be reduced, and the leakage caused by the deviation can be reduced, thereby improving the electrolysis efficiency of the electrolytic cell.

[0047] Example 1

[0048] A pole frame and pole plate capable of uniform flow field, the pole plate 2 comprising a front side and a back side, the pole frame 1 being arranged at the periphery of the pole plate 2, a solution inlet 4 being arranged on the outside of the pole frame 1, a liquid distribution channel 5 penetrating the inside and outside of the pole frame 1 being arranged in the pole frame 1, one end of the liquid distribution channel 5 being connected to the solution inlet 4, and the other end being connected to the side where the front side of the pole plate 2 is located, the liquid distribution channel 5 comprising three liquid distribution channels 5 radially distributed from the outside of the pole frame 1 to the inside of the pole frame 1, the ends of the multiple liquid distribution channels 5 close to the outside of the pole frame 1 converging and overlapping at the solution inlet 4, and the ends of the multiple liquid distribution channels 5 close to the inside of the pole frame 1 pointing to the front side of the pole plate 2 in different directions respectively. Two first guide plates 6, one second guide plate 7, and a plurality of raised spoiler units 3 are arranged on the front of the electrode plate 2. The two first guide plates 6 are respectively arranged on the front of the electrode plate 2 outside the inner outlet of the liquid distribution channel 5 on both sides, and the first guide plates 6 are arranged along the straight line where the corresponding liquid distribution channel 5 is located; the second guide plate 7 is a "V"-shaped guide plate, which is arranged on the front of the electrode plate 2 and symmetrically arranged along the center line of the solution inlet 4; the spoiler unit 3 includes a first section 31 and a second section 32, the first section 31 is a hexagonal prism, and the first section 31 is vertically connected to the front of the electrode plate 2; the second section 32 is arranged at the upper end of the first section 31, and the second section 32 is a hexagonal pyramid with rounded corners at the top, and the first section 31 and the second section 32 are smoothly connected. The angle between the two adjacent liquid distribution channels 5 is 50°. A plurality of spoiler units 3 are evenly distributed on the front of the pole plate 2, and are staggered between any two adjacent rows of spoiler units 3; gaps are left between the adjacent spoiler units 3 to form mutually interpenetrating solution flow channels; the solution flow channels are interpenetrating with the liquid distribution channel 5. The pole plate 2 is a circular plate with a diameter of 300 mm; the bottom widths of the first section 31 and the second section 32 of the spoiler unit are both 10 mm, and the total height of the spoiler unit 3 is 5 mm; the ratio of the height of the first section 31 and the second section 32 of the spoiler unit is 1:1; the center distance between two adjacent spoiler units 3 is 15 mm. Four fixed mounting connection blocks are also provided on the outer edge of the pole frame 1, and the fixed mounting connection blocks are provided with connecting through holes 8. The four fixed mounting connection blocks are evenly distributed in the circumferential direction of the outer edge of the pole frame 1.

[0049] The flow field of the pole frame and pole plate disclosed in this embodiment is simulated and tested when it is used to produce hydrogen from alkaline water. The results are as follows: Figure 4 As shown, from Figure 4 It can be seen that the alkali solution is distributed very evenly in the electrolysis chamber.

[0050] Comparative Example 1

[0051] The difference between this comparative example and Example 1 is that the shape of the flow disturbance unit 3 is changed to a cylindrical shape with a diameter of 10 mm, and other conditions are the same. The flow field condition when the pole frame and pole plate disclosed in this comparative example are applied to alkaline water hydrogen production is simulated and tested. The results are as follows: Figure 5 shown.

[0052] Comparative Example 2

[0053] The difference between this comparative example and Example 1 is that the shape of the flow disturbance unit 3 is changed to an elliptical cylinder with a width of 8 mm and a length of 12 mm, and other conditions are the same. The flow field of the pole frame and pole plate disclosed in this comparative example when applied to alkaline water hydrogen production is simulated and tested. The results are as follows: Figure 6 shown.

[0054] Comparative Example 3

[0055] The difference between this comparative example and Example 1 is that the shape of the flow disturbance unit 3 is changed to an elliptical cylinder with a side width of 10 mm, and other conditions are the same. The flow field of the pole frame and pole plate disclosed in this comparative example when applied to alkaline water hydrogen production is simulated and tested. The results are as follows: Figure 7 shown.

[0056] The comparison of the flow rate at the center of the plate 2 of Example 1 and Comparative Example 1 is shown in the figure Figure 8 As shown, the flow field uniformity coefficient comparison diagram of Example 1 and Comparative Example 1 is as follows Fig. 9 As shown in Figures 4-9, it can be seen that in Comparative Examples 1-3, the alkali solution flow rate is mainly concentrated in the middle of the electrolytic chamber, and the distribution capacity on both sides is poor. In Example 1, the alkali solution flow rate is more evenly distributed in the electrolytic chamber, and the radial liquid distribution channel 5 and the first guide plate 6 and the second guide plate 7 enhance the lateral distribution capacity of the alkali solution at the entrance of the electrolytic chamber, thereby making the alkali solution flow rate in the electrolytic chamber more evenly distributed.

[0057] In the description of the present application, it should be noted that the terms "upper", "lower", "vertical", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", etc., are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0058] Unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0059] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pole frame and pole plate capable of uniform flow field, the pole plate comprising a front side and a back side, the pole frame being arranged at the periphery of the pole plate, a solution inlet being arranged at the outer side of the pole frame, a liquid distribution channel penetrating the inner side and the outer side of the pole frame being arranged at the pole frame, one end of the liquid distribution channel being connected to the solution inlet, and the other end being connected to the side where the front side of the pole plate is located, characterized in that: The liquid distribution channel comprises a plurality of liquid distribution channels radially distributed from the outside of the pole frame to the inside of the pole frame, the ends of the plurality of liquid distribution channels close to the outside of the pole frame converge and overlap at the solution inlet, and the ends of the plurality of liquid distribution channels close to the inside of the pole frame point to the front of the pole plate in different directions respectively; The front side of the electrode plate is provided with a plurality of first guide plates, a second guide plate, and a plurality of raised spoiler units, the plurality of first guide plates are respectively arranged on the front side of the electrode plate outside the inner outlets of the plurality of liquid distribution channels, and the first guide plate is arranged along the straight line where the corresponding liquid distribution channel is located; the second guide plate is a "V"-shaped guide plate, the "V"-shaped guide plate is arranged on the front side of the electrode plate and symmetrically arranged along the center line of the solution inlet; the spoiler unit includes a first section and a second section, the first section is a hexagonal prism, and the first section is vertically connected to the front side of the electrode plate; the second section is arranged at the upper end of the first section, and the second section is a hexagonal pyramid with rounded corners at the top, and the first section and the second section are smoothly connected.

2. The pole frame and pole plate capable of uniform flow field according to claim 1, characterized in that: The number of the liquid distribution channels is no less than three; and the angle between two adjacent liquid distribution channels is 15°-55°.

3. The pole frame and pole plate capable of uniform flow field according to claim 1, characterized in that: When the number of liquid distribution channels is an even number, the number of first guide plates is two less than the number of liquid distribution channels. Except for the two middle liquid distribution channels, a first guide plate is correspondingly arranged outside the outlet of each liquid distribution channel; the "V"-shaped guide plate is arranged outside the two middle liquid distribution channels.

4. The pole frame and pole plate capable of uniform flow field according to claim 1, characterized in that: When the number of liquid distribution channels is odd, the number of first guide plates is one less than the number of liquid distribution channels. Except for the middle liquid distribution channel, a first guide plate is correspondingly arranged outside the outlet of each liquid distribution channel; the "V"-shaped guide plate is arranged outside the middle liquid distribution channel.

5. A pole frame and pole plate capable of uniform flow field according to claim 2, characterized in that: The number of the liquid distribution channels is three.

6. The pole frame and pole plate capable of uniform flow field according to claim 1, characterized in that: The plurality of spoiler units are evenly distributed on the front side of the electrode plate, and are staggered between any two adjacent rows of spoiler units; gaps are left between the adjacent spoiler units to form mutually interpenetrating solution flow channels; the solution flow channels are interpenetrating with the liquid distribution channel.

7. The pole frame and pole plate capable of uniform flow field according to claim 1, characterized in that: The pole plate is a circular plate, and the diameter of the circular plate is 160-800mm; and / or the bottom widths of the first section and the second section of the spoiler unit are both 5-15mm, and the total height of the spoiler unit is 3-9mm; and / or the ratio of the heights of the first section and the second section of the spoiler unit is 1:(0.5-1); and / or the center distance between two adjacent spoiler units is 8-25mm.

8. A pole frame and pole plate capable of uniform flow field according to claims 1-7, characterized in that: A plurality of fixed installation connection blocks are also arranged on the outer edge of the pole frame, and connection through holes are arranged on the fixed installation connection blocks.

9. The pole frame and pole plate capable of uniform flow field according to claim 8, characterized in that: The number of the fixed installation connection blocks is four, and the four fixed installation connection blocks are evenly distributed in the circumferential direction of the outer edge of the pole frame.

10. An electrolytic cell comprising two end plates, a plurality of pole frames and plates, and a plurality of gaskets, characterized in that: It also includes a plurality of mounting positioning columns, the pole frame and pole plate are the pole frame and pole plate capable of uniform flow field as described in claim 7, mounting through holes are arranged at positions on the end plate corresponding to the connecting through holes of the pole frame, and the end plate and the pole frame and pole plate are connected by mounting positioning columns passing through the mounting through holes and the connecting through holes.

11. Use of the electrolyzer according to claim 10 in producing hydrogen from alkaline water.

Images