Electrolytic cell flow channel structure and flow channel optimization method

Abstract

The application relates to the technical field of alkaline water electrolysis, and discloses an electrolytic cell flow channel structure and a flow channel optimization method, wherein the electrolytic cell flow channel structure comprises a polar frame, a polar plate and an electrode, an electrolytic cell chamber is formed among the polar frame, the polar plate and the electrode, a plurality of gas outlets are arranged on the polar frame along the top edge of the electrolytic cell chamber, the gas outlets are communicated with a reaction area of the electrolytic cell chamber, the lower edge of the gas outlet located at the highest position of the polar frame is higher than the highest point of the reaction area of the electrolytic cell chamber, and a liquid inlet on the polar frame is communicated with the reaction area. The gas generated by electrolysis is discharged through the gas outlet at the top of the electrolytic cell chamber, the gas outlet is arranged at the top of the electrolytic cell chamber, and the lower edge of the gas outlet located at the highest position of the polar frame is higher than the highest point of the reaction area, so that the floating gas bubbles can be smoothly discharged from the gas outlet, and the gas is prevented from gathering at the top area of the reaction area of the electrolytic cell chamber. The electrolytic cell flow channel structure provided by the application solves the problem that the gas in the existing electrolytic cell chamber gathers at the top.

Description

Technical Field

[0001] This invention relates to the field of alkaline water electrolysis technology, specifically to an electrolyzer flow channel structure and flow channel optimization method. Background Technology

[0002] Alkaline water electrolysis (AWE) technology works by passing an electric current through an alkaline electrolyte environment (such as KOH solution), causing water to undergo an electrolytic reaction in the alkaline electrolyte, decomposing water into hydrogen and oxygen.

[0003] In existing technologies, the alkaline electrolyzer is the core equipment of an alkaline electrolyte hydrogen production system. The main body of the electrolyzer is assembled from components such as end plates, sealing gaskets, electrode plates, electrodes, and diaphragms, containing dozens or even hundreds of electrolysis chambers. Each electrolysis chamber is divided by two adjacent electrode plates and includes positive and negative bipolar plates, an anode electrode, a diaphragm, sealing gaskets, and a cathode electrode. The alkaline electrolyte enters the reaction zone of the electrolysis chamber through the inlet, and the decomposed gas is output through the outlet.

[0004] However, the outlet of the existing electrolysis chamber is usually lower than the reaction zone. Since the density of gas is much less than that of alkaline electrolyte, the bubbles naturally rise due to buoyancy. A pure gas phase region or a high gas phase volume fraction region is formed in the area between the outlet and the reaction zone, that is, the top of the electrolysis chamber. This hinders the contact between the alkaline electrolyte and the electrode plate, reduces the effective reaction area, and increases concentration polarization and ohmic polarization losses. Summary of the Invention

[0005] This invention provides an electrolytic cell flow channel structure and flow channel optimization method to solve the problem of gas accumulation at the top of existing electrolytic cells.

[0006] In a first aspect, the present invention provides an electrolytic cell flow channel structure, comprising: an electrode frame, electrode plates, and electrodes. At least two electrode plates are disposed inside the electrode frame, and the electrodes are disposed between two adjacent electrode plates. An electrolytic cell is formed between the electrode frame, the electrode plates, and the electrodes. A plurality of gas outlets are disposed on the electrode frame along the top edge of the electrolytic cell. The gas outlets are connected to the reaction zone of the electrolytic cell. The lower edge of the gas outlet located at the highest position of the electrode frame is higher than the highest point of the reaction zone of the electrolytic cell. A liquid inlet is disposed on the electrode frame and is connected to the reaction zone of the electrolytic cell.

[0007] Beneficial effects: An electrolytic cell is formed between the electrode frame, electrode plate, and electrode. The electrolyte enters the reaction zone of the electrolytic cell through the liquid inlet and circulates within it. An electrochemical reaction occurs on the electrode surface to produce hydrogen and oxygen. The hydrogen and oxygen are discharged through the gas outlet at the top of the electrolytic cell. The gas outlet is located at the top of the electrolytic cell, providing a short-path discharge channel for the rising bubbles. Furthermore, the lower edge of the gas outlet, located at the highest point of the electrode frame, is higher than the highest point of the reaction zone, allowing the rising bubbles to exit smoothly from the gas outlet. This prevents gas from accumulating in the top region of the reaction zone of the electrolytic cell, thus preventing the formation of a pure gas phase region or a high gas volume fraction region. The bubble coverage area on the electrode surface is reduced, ensuring an effective reaction area. Concentration polarization and ohmic polarization losses are reduced, improving reaction efficiency. The electrolytic cell flow channel structure provided by this invention solves the problem of gas accumulation at the top of existing electrolytic cells.

[0008] In one optional embodiment, the electrode frame and the electrode plate are circular, and the central angle of the gas outlet corresponding to the distribution area on the upper part of the electrode frame is α, where α is less than or equal to 45°.

[0009] Beneficial effects: The gas outlets are concentrated within a 45° range in the upper part of the electrode frame, which ensures that there is sufficient electrolyte near the top reaction zone of the electrolysis chamber, while also ensuring that bubbles can be discharged smoothly.

[0010] In one alternative embodiment, four gas outlets are provided on the pole frame.

[0011] Beneficial effects: With four gas outlets, compared to the traditional three, the total flow area of ​​the gas outlets is increased by 25% to 40%, which significantly reduces the average flow velocity of the gas-liquid mixture at the gas outlet, reduces gas resistance, and at the same time reduces the dead zone of the flow field inside the chamber, lowers the electrolysis voltage, and improves the electrolysis efficiency.

[0012] In one alternative embodiment, the connection between the gas outlet and the reaction zone is configured with a streamlined structure.

[0013] Beneficial effects: The streamlined structure can reduce gas resistance, allowing bubbles to be smoothly discharged from the gas outlet.

[0014] In one optional embodiment, the electrode frame is further provided with a plurality of flow guiding ribs, which are located in the connection channel between the gas outlet and the reaction zone, and are arranged in a single row or multiple rows along the inner edge of the electrode frame.

[0015] Beneficial effects: The guide ribs form an array structure in the connecting channel between the gas outlet and the reaction zone, making the volumetric flow rate deviation of each gas outlet more balanced, avoiding scouring caused by excessive local flow velocity, reducing the corrosion rate of the electrode frame and seals in the gas outlet area, shortening the equipment maintenance cycle, and extending its service life. At the same time, the vortex of the fluid after passing through the guide ribs can enhance the gas-liquid cross-sectional shear, promote bubble detachment, eliminate the risk of local overheating, and improve the operational stability of the electrolyzer. Through the synergistic effect of the four gas outlets arranged at the top of the reaction zone of the electrolysis chamber and the flow distribution of the guide ribs, under the premise of a moderate increase in the inlet and outlet pressure difference of the reaction zone, the optimal balance of comprehensive performance is achieved, with a significant reduction in gas concentration inside the connecting channel, an increase in average current density, and a significant improvement in velocity uniformity.

[0016] In one alternative implementation, the height of the guide rib is 0.5 to 1 times the depth of the connecting channel.

[0017] Beneficial effects: The height of the guide ribs reaches more than half the depth of the flow channel, which can change the direction of the local flow field, ensure the formation of a stable vortex structure behind the guide ribs, enhance the shearing effect of the gas-liquid interface, and promote the rapid peeling and discharge of bubbles from the electrode surface.

[0018] In one alternative implementation, the length of the guide rib is not less than one time the depth of the connecting channel.

[0019] Beneficial effects: The guide ribs are long enough to avoid insufficient disturbance due to insufficient length, making the volumetric flow rate deviation of each gas outlet more balanced and ensuring the formation of a stable vortex structure behind the guide ribs.

[0020] In one alternative embodiment, the surface of the electrode is configured as a papillary flow field structure.

[0021] Beneficial effects: The papillae on the surface of the electrode plate can be used to support the electrode and guide the flow of electrolyte.

[0022] Secondly, the present invention also provides a flow channel optimization method for optimizing the flow channel structure of the electrolytic cell described in the above embodiments, comprising the following steps: Establish a geometric model of the electrolytic cell flow channel structure and calculate multiple evaluation indicators; Establish a multi-indicator coupled evaluation system.

[0023] Beneficial effects: Taking the geometric model of the electrolyzer flow channel structure as the optimization object, this method calculates multiple evaluation indicators of the electrolyzer flow channel structure, determines the optimization direction and the expected optimal flow channel design parameters, and establishes a multi-indicator coupled evaluation system. This provides a quantitative basis for the optimization of the electrolyzer flow channel structure, avoids the blindness of empirical design, and can be extended to the design of electrolyzers for alkaline water electrolysis technology of different specifications and operating conditions. It has good versatility and scalability.

[0024] In one optional implementation, the multi-indicator coupled evaluation system includes: The evaluation is performed by coupling the maximum gas concentration, average gas concentration, current density uniformity index, and velocity uniformity index of the electrolyzer channel structure. The optimization effect was verified by the average current density of the electrolytic cell flow channel structure and the pressure difference between the inlet and outlet of the electrolysis chamber.

[0025] Beneficial effects: It breaks through the limitations of traditional single-dimensional optimization, and performs coupled evaluation from mutually restrictive evaluation indicators such as gas concentration, current density and inlet and outlet pressure difference, providing a quantitative basis for the optimization of electrolytic cell flow channel structure and avoiding the blindness of experience-based design. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of an electrolytic cell electrode frame structure according to an embodiment of the present invention; Figure 2 for Figure 1 An enlarged schematic diagram of part A in the middle; Figure 3 This is a schematic diagram of the flow channel in an electrolytic cell; Figure 4 for Figure 3 A top-down view; Figure 5 for Figure 3 A magnified view of part B in the middle section; Figure 6 Radar chart of optimization indicators for the flow channel structure of an electrolytic cell; Figure 7 A bar chart showing the optimization indicators for the flow channel structure of the electrolytic cell.

[0028] Explanation of reference numerals in the attached figures: 1. Electrode frame; 2. Electrode plate; 3. Gas outlet; 4. Liquid inlet; 5. Reaction zone; 6. Positioning component; 7. Positioning hole; 8. Flow guide rib; 9. Inlet component; 10. Outlet component. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In related technologies, the outlet flow area of ​​traditional electrolysis chambers is insufficient. As the electrolysis reaction proceeds, the electrolyte gradually transforms from liquid phase to gas-liquid two-phase phase to gas phase from bottom to top, and the gas volume concentration increases significantly along the radial direction of the chamber from the inlet to the outlet. The limited number of outlets and the limited flow area lead to poor flow of the gas-liquid mixture at the outlet, forming local gas resistance, which not only increases pressure drop loss but also exacerbates erosion and corrosion in the outlet area.

[0031] In electrolysis chambers with multiple outlets, due to the lack of an effective flow distribution and control structure, the electrolyte and gas tend to concentrate and flow out at high speed from a few outlets under the influence of gravity, while other outlets are in a low-flow-rate or reflux state. The high-flow-rate outlets significantly aggravate erosion and corrosion, shortening the service life of the electrode frame 1 and the seals; while in the low-flow-rate outlet areas, due to slow electrolyte renewal and severe bubble retention, local overheating and thermal stress concentration occur.

[0032] In related technologies, flow channel structure optimization often starts from a single dimension, such as focusing only on flow velocity uniformity or reducing pressure drop, without coupling analysis of indicators such as gas-liquid flow uniformity, gas concentration distribution, current density distribution, and pressure drop. In reality, these indicators are interrelated and mutually restrictive: regions with high gas concentration are often accompanied by a decrease in current density and local overheating; uneven flow velocity leads to uneven gas concentration distribution; and excessive pressure drop increases energy consumption.

[0033] The following is combined with Figures 1 to 7 The following describes embodiments of the present invention.

[0034] According to an embodiment of the present invention, an electrolytic cell flow channel structure is provided, comprising: an electrode frame 1, an electrode plate 2, and an electrode. At least two electrode plates 2 are disposed inside the electrode frame 1, and the electrode is disposed between two adjacent electrode plates 2. An electrolytic cell is formed between the electrode frame 1, the electrode plates 2, and the electrode. A plurality of gas outlets 3 are disposed on the electrode frame 1 along the top edge of the electrolytic cell. The gas outlets 3 are connected to the reaction zone 5 of the electrolytic cell. The lower edge of the gas outlet 3 located at the highest position of the electrode frame 1 is higher than the highest point of the reaction zone 5 of the electrolytic cell. A liquid inlet 4 is disposed on the electrode frame 1 and is connected to the reaction zone 5 of the electrolytic cell.

[0035] In use, the electrodes are energized, and the electrolyte enters the reaction zone 5 of the electrolysis chamber through the liquid inlet 4 and circulates. An electrochemical reaction occurs on the electrode surface, producing hydrogen and oxygen. The hydrogen and oxygen are discharged through the gas outlet 3 at the top of the electrolysis chamber. The gas outlet 3 is located at the top of the electrolysis chamber, providing a short-path discharge channel for rising bubbles. The lower edge of the gas outlet 3, located at the highest point of the electrode frame 1, is higher than the highest point of the reaction zone 5, allowing the rising bubbles to exit smoothly from the gas outlet 3. This prevents gas accumulation in the top region of the reaction zone 5 of the electrolysis chamber, avoiding the formation of a pure gas phase region or a high gas volume fraction region. The reduced bubble coverage area on the electrode surface ensures an effective reaction area, reduces concentration polarization and ohmic polarization losses, and improves reaction efficiency. The electrolytic cell flow channel structure provided in this embodiment solves the problem of gas accumulation at the top of existing electrolysis chambers.

[0036] Specifically, the electrode plate 2 is provided with an inlet component 9, which is connected to the liquid inlet 4 on the electrode frame 1. The electrode plate 2 is also provided with an outlet component 10, which is connected to the gas outlet 3 on the electrode frame 1. The electrode frame 1 is provided with a positioning hole 7 that cooperates with the positioning member 6.

[0037] In one embodiment, the electrode frame 1 and the electrode plate 2 are circular, and the central angle of the distribution area of ​​the gas outlet 3 on the upper part of the electrode frame 1 is α, where α is less than or equal to 45°. The gas outlets 3 are concentrated within a 45° range on the upper part of the electrode frame 1, ensuring sufficient electrolyte in the reaction zone 5 near the top of the electrolysis chamber, while also ensuring that bubbles can be smoothly discharged. Specifically, multiple gas outlets 3 are arranged sequentially and closely on the upper part of the electrode frame 1. Alternatively, as an alternative embodiment, the gas outlets 3 can also be dispersed on the upper part of the electrode frame 1.

[0038] Specifically, such as Figure 1 As shown, the vertical and horizontal dashed lines on the polar frame 1 form a cross coordinate system. The upper end of the vertical dashed line is the top of the electrolysis chamber, and the gas outlet 3 is located in the second quadrant of this cross coordinate system.

[0039] In one embodiment, four gas outlets 3 are provided on the electrode frame 1. Compared to the conventional three gas outlets, having four gas outlets 3 increases the total flow area by 25% to 40%, significantly reducing the average flow velocity of the gas-liquid mixture at the gas outlets 3, decreasing gas resistance, reducing the dead zone in the flow field inside the electrolysis chamber, lowering the electrolysis voltage, and improving electrolysis efficiency. Alternatively, as an alternative implementation, three gas outlets 3 may be provided, or the number may be adjusted according to design requirements.

[0040] Specifically, the minimum spacing between each of the gas outlets 3 is designed to meet structural design and manufacturing requirements.

[0041] In one embodiment, the connection between the gas outlet 3 and the reaction zone 5 is configured with a streamlined structure. The streamlined structure reduces gas resistance, allowing bubbles to exit smoothly from the gas outlet 3. Alternatively, as an alternative embodiment, the connection between the gas outlet 3 and the reaction zone 5 can also be a right-angled structure.

[0042] In one embodiment, the electrode frame 1 is further provided with multiple flow guide ribs 8. These ribs are arranged in a single row or multiple rows along the inner edge of the electrode frame 1 within the connecting channel between the gas outlet 3 and the reaction zone 5. The flow guide ribs 8 form an array structure within the connecting channel between the gas outlet 3 and the reaction zone 5, making the volumetric flow rate deviation of each gas outlet 3 more balanced, avoiding scouring caused by excessively high local flow velocities, reducing the corrosion rate of the electrode frame 1 and seals in the gas outlet 3 area, shortening the equipment maintenance cycle, and extending its service life. Simultaneously, the vortex formed by the fluid after passing through the flow guide ribs 8 enhances the gas-liquid cross-sectional shear, promotes bubble detachment, eliminates the risk of local overheating, and improves the operational stability of the electrolytic cell. Through the synergistic effect of the four gas outlets 3 arranged at the top of the reaction zone 5 of the electrolysis chamber and the flow distribution of the flow guide ribs 8, under the premise of a moderately increased inlet and outlet pressure difference in the reaction zone 5, the optimal balance of comprehensive performance is achieved, resulting in a significant reduction in gas concentration inside the flow channel, an increase in average current density, and a significant improvement in velocity uniformity. Alternatively, as an alternative implementation, the guide rib 8 can be omitted.

[0043] Specifically, the guide rib 8 and the fluid contact surface are designed in a streamlined shape.

[0044] Specifically, the circumferential position and width of the guide ribs 8 are determined by comprehensively considering the position of the gas outlet 3, the size of the reaction zone 5, and the dimensions of the electrode frame 1, with the spacing of the guide ribs 8 being determined to achieve optimal overall performance. The average current density is increased by 2.6%, resulting in increased hydrogen production with the same energy consumption.

[0045] In one embodiment, the height of the guide rib 8 is 0.5 to 1 times the depth of the connecting channel. When the height of the guide rib 8 reaches more than half the depth of the connecting channel, it can change the direction of the local flow field, ensuring the formation of a stable vortex structure behind the guide rib 8, enhancing the shearing effect at the gas-liquid interface, and promoting the rapid stripping and discharge of bubbles from the electrode surface. Alternatively, as an alternative embodiment, the height of the guide rib 8 can be less than 0.5 times the depth of the connecting channel.

[0046] It should be noted that if the height of the guide rib 8 is too low, the turbulence effect will be insufficient, and the bubbles will be difficult to detach.

[0047] In one embodiment, the length of the guide rib 8 is not less than one time the depth of the connecting channel. The guide rib 8 is long enough to avoid insufficient disturbance due to insufficient length, thus ensuring a more balanced volumetric flow rate deviation at each gas outlet 3 and guaranteeing the formation of a stable vortex structure behind the guide rib 8. Alternatively, as an alternative embodiment, the length of the guide rib 8 may be less than one time the depth of the connecting channel.

[0048] In one embodiment, the surface of the electrode 2 is configured with a papillary flow field structure. The papillae on the surface of the electrode 2 can be used to support the electrode and guide the electrolyte flow.

[0049] According to an embodiment of the present invention, another aspect provides a flow channel optimization method for optimizing the flow channel structure of the electrolytic cell described in the above embodiments, comprising the following steps: Establish a geometric model of the electrolytic cell flow channel structure and calculate multiple evaluation indicators; Establish a multi-indicator coupled evaluation system.

[0050] In practice, the geometric model of the electrolyzer flow channel structure is used as the optimization object. Multiple evaluation indicators of the electrolyzer flow channel structure are calculated to determine the optimization direction and the expected optimal flow channel design parameters. A multi-indicator coupled evaluation system is established to provide quantitative basis for the optimization of the electrolyzer flow channel structure, avoiding the blindness of empirical design. This method can be extended to the design of electrolyzers for alkaline water electrolysis technology of different specifications and operating conditions, and has good versatility and scalability.

[0051] In one embodiment, a multi-indicator coupled evaluation system includes: The evaluation is performed by coupling the maximum gas concentration, average gas concentration, current density uniformity index, and velocity uniformity index of the electrolyzer channel structure. The optimization effect was verified by the average current density of the electrolytic cell flow channel structure and the pressure difference between the inlet and outlet of the electrolysis chamber.

[0052] The multi-indicator coupled evaluation system breaks through the limitations of traditional single-dimensional optimization. It performs coupled evaluation of mutually restrictive evaluation indicators such as gas concentration, current density, and inlet / outlet pressure difference, providing a quantitative basis for the optimization of electrolytic cell flow channel structure and avoiding the blindness of experience-based design.

[0053] Specifically, such as Figure 5 , Figure 6As shown, the optimization effects of the electrolytic cell flow channel structure provided in this embodiment are as follows: the maximum gas concentration at the anode is reduced by 11%, the maximum gas concentration at the cathode is reduced by 8%, the average gas concentration at the anode is reduced by 6%, the average gas concentration at the cathode is reduced by 4%, the bubble coverage area on the electrode surface is reduced, the effective reaction area is increased, and the concentration polarization and ohmic polarization losses are reduced; the velocity uniformity index is improved by 3.3%, the electrolyte velocity distribution within the electrolytic cell flow channel structure is more uniform, the dead zone area of ​​the flow field is reduced, the electrolyte renewal frequency is increased, and the overall mass transfer efficiency is improved; the anode pressure difference increases by about 7%, and the cathode pressure difference increases by about 5%. This increase in pressure difference is due to the local resistance of the four-outlet structure and the guide rib 8, but the increase is controllable, and it results in a significant improvement in the uniformity of gas concentration, current density, and velocity, achieving the optimal balance of comprehensive performance.

[0054] It should be noted that the electrolytic cell flow channel structure provided in this embodiment can be realized through mature processes such as machining, stamping or casting, without the need for special materials or complex configurations, making it suitable for industrial mass production.

[0055] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An electrolytic cell flow channel structure, characterized in that, include: The electrode frame (1), electrode plate (2), and electrode are provided. At least two electrode plates (2) are provided inside the electrode frame (1). The electrode is provided between two adjacent electrode plates (2). An electrolytic cell is formed between the electrode frame (1), the electrode plate (2), and the electrode. Multiple gas outlets (3) are provided on the electrode frame (1) along the top edge of the electrolytic cell. The gas outlets (3) are connected to the reaction zone (5) of the electrolytic cell. The lower edge of the gas outlet (3) located at the highest position of the electrode frame (1) is higher than the highest point of the reaction zone (5) of the electrolytic cell. A liquid inlet (4) is provided on the electrode frame (1). The liquid inlet (4) is connected to the reaction zone (5) of the electrolytic cell.

2. The electrolytic cell flow channel structure according to claim 1, characterized in that, The pole frame (1) and the pole plate (2) are set to be circular, and the central angle of the gas outlet (3) in the distribution area of ​​the upper part of the pole frame (1) is α, where α is less than or equal to 45°.

3. The electrolytic cell flow channel structure according to claim 1, characterized in that, The gas outlet (3) is provided in four places on the pole frame (1).

4. The electrolytic cell flow channel structure according to claim 1, characterized in that, The connection between the gas outlet (3) and the reaction zone (5) is configured with a streamlined structure.

5. The electrolytic cell flow channel structure according to any one of claims 1-4, characterized in that, The pole frame (1) is also provided with a plurality of flow guide ribs (8), which are located in the connecting channel between the gas outlet (3) and the reaction zone (5). The flow guide ribs (8) are arranged in a single row or multiple rows along the inner edge of the pole frame (1).

6. The electrolytic cell flow channel structure according to claim 5, characterized in that, The height of the guide rib (8) is 0.5 to 1 times the depth of the connecting channel.

7. The electrolytic cell flow channel structure according to claim 6, characterized in that, The length of the guide rib (8) is not less than one time the depth of the connecting channel.

8. The electrolytic cell flow channel structure according to claim 6 or 7, characterized in that, The surface of the electrode plate (2) is configured as a nipple-shaped flow field structure.

9. A flow channel optimization method, characterized in that, The optimization of the electrolytic cell flow channel structure according to any one of claims 1-8 includes the following steps: Establish a geometric model of the electrolytic cell flow channel structure and calculate multiple evaluation indicators; Establish a multi-indicator coupled evaluation system.

10. The flow channel optimization method according to claim 9, characterized in that, The multi-indicator coupled evaluation system includes: The optimization effect is evaluated by coupling the maximum gas concentration, average gas concentration, current density uniformity index, and velocity uniformity index of the electrolytic cell flow channel structure. The optimization effect was verified by the average current density of the electrolytic cell flow channel structure and the pressure difference between the inlet and outlet of the electrolysis chamber.

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