Reverse current and reverse current testing device for electrolytic cell

Abstract

The utility model discloses an electrolytic bath reverse current testing device, and relates to the technical field of water electrolysis hydrogen production. On one hand, the reverse current testing device for the electrolytic bath can measure the magnitude and the change condition of the reverse current in the electrolytic bath in real time, and is favorable for mastering the state of the electrolytic bath in real time, so that data support is provided for testing and developing electrodes; on the other hand, the actual current state in the electrolytic bath can be tested in real time, the working state of the electrolytic bath or the electrolytic system can be monitored more clearly by comparing the tested current with the power output current, and the electrolytic bath or the electrolytic system can be monitored once the two currents have obvious differences, namely obvious faults exist in the surface electrolytic bath or the electrolytic system. Therefore, the safety and stability of the electrolysis system are ensured.

Description

Technical Field

[0001] This utility model relates to the field of water electrolysis for hydrogen production technology, and more specifically, to a reverse current testing device for an electrolyzer. Background Technology

[0002] Traditional fossil fuel-based hydrogen production generates significant carbon emissions, while alkaline water electrolysis, powered by renewable energy, offers a carbon-free, green hydrogen production process. This contributes to the energy structure's transition to clean energy and meets the demands of future low-carbon or even zero-carbon energy systems. Hydrogen, as a clean and efficient secondary energy source, boasts advantages such as high energy density, storability, and transportability, making it a promising candidate for applications in fuel cell vehicles, distributed power generation, and energy storage. Alkaline water electrolysis, a crucial technology for large-scale hydrogen production, is vital for the development of the hydrogen energy industry, providing a stable and reliable hydrogen source for various applications. Alkaline water electrolysis is one of the earliest and most mature water electrolysis hydrogen production technologies, with over a century of history. Its equipment and processes are relatively stable, and it has already seen considerable application in the industrial sector.

[0003] However, because alkaline water electrolysis for hydrogen production uses a liquid electrolyte, fluctuations in power supply, electrode inhomogeneity, mismatched electrode installation, defective or improperly installed diaphragms, or improper operation can generate a reverse current of a certain intensity between the anode and cathode. This alters the potential and current direction on the electrode surface, potentially transforming a reducing environment into an oxidizing one, and vice versa. For example, the reverse current can oxidize the cathode (hydrogen evolution electrode), causing oxidation and corrosion of the electrode material (such as commonly used nickel-based electrode materials), reducing the number of active sites on its surface, and affecting the efficiency of the subsequent normal hydrogen evolution reaction. The microstructure of the electrode surface is also damaged after being subjected to the impact of the reverse current. The originally uniform and ordered catalyst layer or active layer may peel off or agglomerate. In the case of the oxygen evolution electrode, the active oxide coating on its surface may collapse under the influence of the reverse current, significantly reducing the electrode's activity in the electrochemical reaction, thereby increasing the overpotential required for subsequent normal electrolysis and increasing energy consumption. Furthermore, the presence of reverse current may accelerate the aging and degradation process of the membrane material, thereby increasing the risk of malfunctions inside the electrolytic cell. For example, it may cause safety accidents due to local overheating, gas leakage, etc. Especially in large-scale industrial applications, the consequences of such safety problems are quite serious.

[0004] To better study the impact of reverse current on the performance and safety of electrolytic cells, it is necessary to detect and monitor the possible reverse current in real time. Therefore, it is necessary to develop a device and method that can accurately detect reverse current.

[0005] In view of this, this utility model is proposed. Utility Model Content

[0006] The purpose of this invention is to provide an electrolytic cell reverse current testing device and a method for testing the reverse current of an alkaline electrolytic cell, aiming to provide an accurate device and method for detecting reverse current.

[0007] This utility model is implemented as follows:

[0008] In a first aspect, this utility model provides a reverse current testing device for an electrolytic cell, comprising:

[0009] A first test plate has a first surface, a second surface, and a peripheral side surface. The first test plate includes an electrode plate region with flow channels and an electrode frame region surrounding the electrode plate region. At least three first flow channel holes are spaced apart on the electrode frame region, each of the first flow channel holes penetrating the first surface and the second surface. At least one sidewall of the first flow channel hole communicates with the electrode plate region of the first surface. At least one first flow collector is provided on the peripheral side surface of the first test plate.

[0010] The second test plate has a first surface, a second surface, and a peripheral side surface. The second test plate includes an electrode plate region with flow channels and an electrode frame region surrounding the electrode plate region. At least three second flow channel holes are spaced apart on the electrode frame region. Each second flow channel hole penetrates the first surface and the second surface. The position and shape of the second flow channel holes correspond to the first flow channel holes. At least one sidewall of the second flow channel hole communicates with the electrode plate region of the first surface. At least one second flow collector is provided on the peripheral side surface of the second test plate.

[0011] An insulating board having at least three third flow channel holes, each of which penetrates two opposite surfaces of the insulating board, and the position and shape of the third flow channel holes correspond to the first flow channel holes and the second flow channel holes.

[0012] In operation, the insulating plate is located between the first test plate and the second test plate, and the first current collector and the second current collector are used to connect the wires.

[0013] In an optional embodiment, a first flow guiding structure is provided at the edge of the electrode frame area of ​​the first test plate, and the first flow guiding structure is used to connect the first flow channel hole with the electrode area of ​​the first test plate.

[0014] The edge of the pole frame area of ​​the second test plate is provided with a second flow guiding structure, which is used to connect the second flow channel hole with the pole plate area of ​​the second test plate.

[0015] In optional embodiments, the shapes of the first and second flow guiding structures are independently corrugated, fence-like, comb-like, toothed, mesh-like, porous, or foam-like.

[0016] In an optional embodiment, the first flow channel hole forms a first flow direction using a first flow guiding structure, and the second flow channel hole forms a second flow direction using a second flow guiding structure, with the first and second flow directions arranged intersecting.

[0017] In an optional embodiment, the number of the first flow channel hole, the second flow channel hole, and the third flow channel hole are all 3, 4, or 6;

[0018] When the quantity is 3, it includes one feed port and two discharge ports;

[0019] When the quantity is 4, it includes two feed holes and two discharge holes;

[0020] When the quantity is 6, it includes three feed holes and three discharge holes.

[0021] In an optional implementation, feed holes are distributed at the bottom of the first test plate, the second test plate, and the insulating plate;

[0022] The discharge holes are located on the upper part of the first test plate, the second test plate, and the insulating plate;

[0023] The feed hole can be round, square, flat, oval, or semi-circular in shape;

[0024] The discharge hole can be round, square, flat, oval, or semi-circular.

[0025] In an optional embodiment, the first collector ear and the second collector ear are staggered to form a safety angle of 5° to 100°.

[0026] In an optional implementation, the first test board, the second test board, and the insulating board have a consistent geometry and size, which is square, rectangular, or circular.

[0027] In an optional implementation, when the geometry is square or rectangular, the dimensions include length, width, and thickness, with the length and width ranging from 5cm to 500cm and the thickness from 1mm to 50mm.

[0028] In an optional implementation, when the geometry is circular, the dimensions include diameter and thickness, with a diameter of 5cm-500cm and a thickness of 1mm-50mm.

[0029] This invention offers the following advantages: The electrolytic cell reverse current testing device provided by this invention allows the electrolyte or gas-liquid mixture to flow through the first, second, and third flow channel holes. The first and second current collectors collect the current flowing through the first and second test plates. A current acquisition device is connected to the first and second current collectors to collect the current signal in the circuit. During the process, oxygen and hydrogen gases are generated on the two surfaces of the two test plates, flowing out from the corresponding flow channel holes. On one hand, it allows for real-time measurement of the magnitude and changes in the reverse current in the electrolytic cell, facilitating real-time monitoring of the electrolytic cell's state and providing data support for electrode testing and development. On the other hand, it also allows for real-time testing of the actual current state in the electrolytic cell. By comparing the measured current with the power supply output current, the working state of the electrolytic cell or electrolysis system can be more clearly monitored. If there is a significant difference between the two, it indicates a significant fault in the electrolytic cell or electrolysis system, thus helping to ensure the safety and stability of the electrolysis system. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a structural diagram of the electrolytic cell reverse current testing device provided in Example 1;

[0032] Figure 2 This is a schematic diagram of the assembled electrolytic cell reverse current testing device provided in Example 1;

[0033] Figure 3 This is a diagram of the current signal of the electrolytic cell acquired by the current acquisition device in Example 1;

[0034] Figure 4 This is a structural diagram of the electrolytic cell reverse current testing device provided in Example 2;

[0035] Figure 5 This is a diagram of the current signal of the electrolytic cell acquired by the current acquisition device in Example 2;

[0036] Figure 6 This is a structural diagram of the electrolytic cell reverse current testing device provided in Example 3;

[0037] Figure 7 The image shows the current signal of the electrolytic cell acquired by the current acquisition device in Example 3.

[0038] Explanation of key component symbols: 100-Reverse current testing device for electrolytic cell; 001-Electrode plate area; 002-Electrode frame area; 003-First surface; 004-Second surface; 005-Peripheral side surface; 006-Current collector wire; 110-First test plate; 111-First flow channel hole; 112-First current collector ear; 113-First current guiding structure; 120-Second test plate; 121-Second flow channel hole; 122-Second current collector ear; 123-Second current guiding structure; 130-Insulating plate; 131-Third flow channel hole. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0041] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0042] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0043] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0044] Please refer to Figure 1 and Figure 2 This utility model provides an electrolytic cell reverse current testing device 100, which includes a first test plate 110, a second test plate 120 and an insulating plate 130. In use, the insulating plate 130 is located between the first test plate 110 and the second test plate 120.

[0045] [First Test Board 110]

[0046] The first test plate 110 includes an electrode region 001 with flow channels and an electrode frame region 002 surrounding the electrode region 001. The electrode region 001 has flow channels for the flow of a reaction medium, such as an electrolyte. The first test plate 110 has a first surface 003, a second surface 004, and a peripheral surface 005. At least one first current collector 112 is provided on the edge of the electrode frame region 002 of the first test plate 110 (e.g., on the peripheral surface 005). At least three first flow channel holes 111 are spaced apart on the electrode frame region 002. Each first flow channel hole 111 penetrates two opposite surfaces of the first test plate 110 (i.e., penetrates the first surface 003 and the second surface 004). At least two first flow channel holes 111 communicate with the electrode region 001 on the first test plate 110 and flow out from the channels on the electrode region 001. Specifically, the sidewall of at least one first flow channel hole 111 communicates with the electrode region 001 on the first surface 003. Since oxygen is produced on one surface and hydrogen is produced on the other surface during the process, the generated gases are discharged through two different flow channels.

[0047] A first flow guiding structure 113 is provided at the edge of the electrode frame region 002 of the first test plate 110, which connects the first flow channel hole 111 to the electrode region 001 of the first test plate 110. That is, at least one first flow channel hole 111 is connected to the electrode region 001 of the first surface 003 through the first flow guiding structure 113. Specifically, the electrode region 001 can be made of solid metal material and can have one or more flow channel structures selected from the following: nipple-shaped, reciprocating, labyrinthine, serpentine, corrugated, and mesh-shaped.

[0048] In some embodiments, the shape of the first flow guiding structure 113 can be independently corrugated, fence-shaped, comb-shaped, toothed, mesh-shaped, porous, or foam-shaped. All of these structures have flow channels, which can realize the connection between the first flow channel hole 111 and the electrode plate region 001. A certain flow direction can be formed by using the first flow guiding structure 113. Specifically, corrugated and fence-shaped are used to describe the shape of the channel extension. Corrugated means that the channel is not straight and has reciprocating folds; fence-shaped means that the channel is a series of rectangular channels.

[0049] In some embodiments, the material of the first test plate 110 is selected from at least one of Ni and Ni-based alloys, Fe and Fe-based alloys, Co and Co-based alloys, Cu and Cu-based alloys, and Ag and Ag-based alloys. The material of the first test plate 110 can be any one or more of the above.

[0050] [Second Test Board 120]

[0051] The second test plate 120 has a similar structure to the first test plate 110. The second test plate 120 includes a hollow electrode region 001 and an electrode frame region 002 surrounding the electrode region 001. Flow channels are provided on the electrode region 001 for the flow of a reaction medium, such as an electrolyte. The second test plate 120 also has a first surface 003, a second surface 004, and a peripheral side surface 005. At least one second collector ear 122 is provided on the edge of the electrode frame region 002 (e.g., on the peripheral side surface 005). At least three second flow channel holes 121 are spaced apart on the electrode frame region 002. Each second flow channel hole 121 penetrates two opposite surfaces of the second test plate 120 (i.e., penetrates the first surface 003 and the second surface 004). The size, shape, and position of the multiple second flow channel holes 121 correspond one-to-one with the multiple first flow channel holes 111. At least two second flow channel holes 121 communicate with the electrode region 001 on the second test plate 120, outputting the gas generated on the corresponding surface. Specifically, at least one sidewall of the second flow channel hole 121 is connected to the electrode region 001 of the first surface 003. Since oxygen is generated on one surface and hydrogen is generated on the other surface during the process, the generated gases are discharged through two different flow channel holes.

[0052] A second flow guiding structure 123 is provided at the edge of the electrode frame region 002 of the second test plate 120, which connects the second flow channel hole 121 to the electrode region 001 of the second test plate 120. That is, at least one second flow channel hole 121 is connected to the electrode region 001 of the first surface 003 through the second flow guiding structure 123. Specifically, the electrode region 001 can be made of solid metal material and can have one or more flow channel structures selected from the following: nipple-shaped, reciprocating, labyrinthine, serpentine, corrugated, and mesh-shaped.

[0053] Furthermore, the shapes of the first flow guiding structure 113 on the first test plate 110 and the second flow guiding structure 123 on the second test plate 120 can be the same or different. For example, they can be independently corrugated, fence-like, comb-like, toothed, mesh-like, porous, or foam-like.

[0054] Furthermore, the first flow channel hole 111 forms a first flow direction using the first flow guiding structure 113, and the second flow channel hole 121 forms a second flow direction using the second flow guiding structure 123. The first and second flow directions are arranged in an intersecting manner to achieve cross-flow and better separate different reaction media.

[0055] Furthermore, the first current collector 112 is located on the peripheral side of the first test plate 110, and the second current collector 122 is located on the peripheral side of the second test plate 120. The first current collector 112 and the second current collector 122 are staggered, forming a safety angle after installation. The safety angle is 5° to 100°, such as 5°, 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, 90°, 100°, etc. A "safety angle" refers to the angle by which the two current collectors are not perfectly aligned, but misaligned. Setting a safety angle can improve operational safety and avoid safety accidents caused by short circuits in the current collectors.

[0056] In some embodiments, the material of the second test plate 120 is selected from at least one of Ni and Ni-based alloys, Fe and Fe-based alloys, Co and Co-based alloys, Cu and Cu-based alloys, and Ag and Ag-based alloys. The material of the second test plate can be any one or more of the above.

[0057] [Insulating Board 130]

[0058] The insulating plate 130 is made of solid insulating material and also has a first surface, a second surface, and a peripheral surface. The insulating plate 130 has multiple third flow channel holes 131, each of which penetrates two opposite surfaces of the insulating plate 130. The size, position, and shape of the multiple third flow channel holes 131 correspond to the first flow channel holes 111 and the second flow channel holes 121. That is, the number of first flow channel holes 111, second flow channel holes 121, and third flow channel holes 131 is the same, and their positions correspond after installation.

[0059] In operation, the insulating plate 130 is located between the first test plate 110 and the second test plate 120 to separate them. The first current collector 112 and the second current collector 122 are used to connect wires. The first current collector 112, the second current collector 122 and the current acquisition device are connected by the current collector wire 006, and the current acquisition device acquires the current signal in the line.

[0060] Furthermore, the material of the insulating board 130 is not limited, and can be selected from at least one of polymer insulating materials, ceramic materials, and composite materials, or any one or more of the above. Among them, polymer insulating materials include polytetrafluoroethylene, polyphenylene sulfide, polyetheretherketone, polyethylene, polyester, polyimide, epoxy resin, silicone resin, phenolic resin, polyester, polybutadiene, and rubber; ceramic materials include alumina, zirconium oxide, nickel oxide, chromium oxide, titanium oxide, titanium nitride, silicon carbide, silicon nitride, and chromium carbide; composite materials include at least one of glass fiber, resin fiber, polyester fiber, polymer insulating materials, and ceramic materials, or any one or more of the above.

[0061] In some embodiments, the insulating board 130 can be a multi-layer structure, formed by stacking layers one after another. The specific manufacturing process is not limited and can be any existing stacking process. The material of each layer can be independently selected from at least one of the above-mentioned insulating board materials (polymer insulating materials, ceramic materials, and composite materials).

[0062] In some embodiments, the number of the first flow channel hole 111, the second flow channel hole 121, and the third flow channel hole 131 are all 3, 4, or 6. When the number is 3, it may include one feed hole and two discharge holes; when the number is 4, it may include two feed holes and two discharge holes; when the number is 6, it may include three feed holes and three discharge holes. The feed holes may be distributed at the bottom of the first test plate 110, the second test plate 120, and the insulating plate 130; the discharge holes may be distributed at the top of the first test plate 110, the second test plate 120, and the insulating plate 130. When there are multiple feed holes, they are symmetrically arranged at the bottom of the first test plate 110, the second test plate 120, and the insulating plate 130; the discharge holes are symmetrically arranged at the top of the first test plate 110, the second test plate 120, and the insulating plate 130.

[0063] The shapes of the feed hole and discharge hole are not limited. For example, the feed hole can be round, square, flat, oval or semi-circular, and the discharge hole can be round, square, flat, oval or semi-circular.

[0064] Furthermore, the first test plate 110, the second test plate 120, and the insulating plate 130 have consistent geometric shapes and dimensions, which can be square, rectangular, or circular. When the geometric shape is square or rectangular, the dimensions include length, width, and thickness. The length and width are 5cm-500cm (e.g., 5cm, 10cm, 50cm, 100cm, 150cm, 200cm, 250cm, 300cm, 350cm, 400cm, 450cm, 500cm, etc.), and the thickness is 1mm-50mm (e.g., 1mm, 5mm, 10mm, 20mm, 30mm, 40mm, 50mm, etc.). (e.g., mm); when the geometric shape is circular, the dimensions include diameter and thickness, with diameter ranging from 5cm to 500cm (e.g., 5cm, 10cm, 50cm, 100cm, 150cm, 200cm, 250cm, 300cm, 350cm, 400cm, 450cm, 500cm, etc.) and thickness ranging from 1mm to 50mm (e.g., 1mm, 5mm, 10mm, 20mm, 30mm, 40mm, 50mm, etc.).

[0065] This utility model embodiment also provides a method for testing the reverse current of an alkaline electrolytic cell. Utilizing the electrolytic cell reverse current testing device 100 provided in this utility model embodiment, the method includes: placing a first test plate 110, an insulating plate 130, and a second test plate 120 into the electrolytic cell to be tested; and installing the insulating plate 130 between the first test plate 110 and the second test plate 120. A first current collector 112, a second current collector 122, and a current acquisition device are connected via current collector wires, and the current acquisition device acquires the current signal in the circuit.

[0066] In other embodiments, the first current collector 112 and the second current collector 122 can be directly connected by current collector wires, and the current in the line can be collected by an inductive current acquisition device.

[0067] Furthermore, the current collector wire provided in this embodiment of the present invention is made of one or more strands of conductive material with extremely low resistivity. The conductive material is Cu and Cu-based alloy, Al and Al-based alloy, or Ag and Ag-based alloy. The type of conductive material can be any one or more of the above.

[0068] In some embodiments, multiple test units consisting of a first test plate 110, an insulating plate 130, and a second test plate 120 can be installed in an electrolytic cell to monitor the current in multiple chambers or electrodes of the electrolytic cell.

[0069] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0070] Example 1

[0071] This embodiment provides a reverse current testing device for an electrolytic cell, the specific preparation process of which is as follows:

[0072] (1) Processing the first test board

[0073] A thin, plate-shaped 316 solid metal plate is obtained through processing. The metal plate has a first surface, a second surface, and a peripheral side surface, and a current collector is provided on its peripheral side surface.

[0074] Four flow channel holes penetrating the first and second surfaces are provided in the outer regions of the first and second surfaces to form a first test plate. Of the four flow channel holes, the bottom two are inlet holes and the top two are outlet holes. The inlet holes are located at the bottom of the first test plate; the outlet holes are located at the top of the first test plate; the outlet holes are symmetrically arranged at the top of the first test plate; one of the two outlet holes communicates with the first surface of the first test plate; the inlet holes are flat; the outlet holes are flat.

[0075] A corrugated flow guide structure is provided in the connecting area, allowing for a directional flow between the connecting flow channels. A nipple-shaped flow channel structure is provided in the electrode area.

[0076] The first test plate has a circular geometry; the diameter of the first test plate is 1500 cm; and the thickness of the first test plate is 7 mm.

[0077] (2) Processing the second test board

[0078] Another thin, plate-shaped 316 solid metal plate is obtained through processing. This plate has a first surface, a second surface, and a peripheral side surface, with a current collector provided on the peripheral side surface. This current collector is arranged at a 15° offset from the current collector on the first test plate.

[0079] Four flow channel holes penetrating the first and second surfaces are provided on the outer regions of the first and second surfaces. These flow channel holes are located within an electrode frame, and the area enclosed by the electrode frame is the electrode plate area. The size, shape, and position of the flow channel holes correspond one-to-one with the flow channel holes of the first electrode plate, resulting in the second test plate. There are four flow channel holes: two at the bottom are inlet holes, and two at the top are outlet holes. The size, shape, and position of the inlet holes are consistent with those of the inlet holes on the first test plate; the size, shape, and position of the outlet holes are consistent with those of the outlet holes on the first test plate. At least one inlet hole and one outlet hole simultaneously communicate with the electrode plate area of ​​the first surface; a corrugated flow guiding structure is provided within the communicating area. The flow direction formed by the communicating flow channel holes is arranged intersecting with the flow direction of the first test plate.

[0080] The electrode region is made of solid metal and has a nipple-shaped flow channel structure. The geometry and dimensions of the second test plate are the same as those of the first test plate.

[0081] (3) Processing insulation boards

[0082] A sheet-like polytetrafluoroethylene solid plate with a first surface, a second surface, and peripheral side is obtained. Multiple flow channel holes are provided on the first and second surfaces, and the size, shape, and position of the flow channel holes correspond one-to-one with the flow channel holes on the first and second test plates.

[0083] There are four flow channel holes, two of which are feed holes at the bottom and two of which are discharge holes at the top. The size, shape and position of the feed holes are the same as those on the first test plate. The size, shape and position of the discharge holes are the same as those on the first test plate. The geometry of the insulating plate is the same as that of the first test plate and the second test plate. The thickness of the insulating plate is 5mm.

[0084] Will as Figure 1 The first test board, insulating board, and second test board shown are arranged in accordance with... Figure 2 The device is installed in the electrolytic cell under test as shown, and the first test plate current collector, the second test plate current collector, and the current acquisition device are connected by pure Cu wires. The current acquisition device collects data as shown. Figure 3 The electrolytic cell current signal is shown.

[0085] Example 2

[0086] This embodiment provides a reverse current testing device for an electrolytic cell, the specific preparation process of which is as follows:

[0087] (1) Processing the first test board

[0088] A thin, plate-shaped solid nickel metal plate is obtained through processing. The metal plate has a first surface, a second surface, and a peripheral side surface, with two current collectors provided on its peripheral side surface.

[0089] Four flow channels penetrating the first and second surfaces are provided in the outer region of the first and second surfaces to form a first test plate. Of the four flow channels, the third and fourth are feed inlets, and the first and second are discharge outlets. The feed inlets are arranged symmetrically at the bottom of the first test plate. The discharge outlets are arranged symmetrically at the top of the first test plate. The fourth flow channel of the two feed inlets communicates with the first surface of the first test plate. The first flow channel of the two discharge outlets communicates with the first surface of the first test plate. The feed inlets and discharge outlets are flat. A grid-like flow guide structure is provided within the connecting area. A flow direction from the feed inlets to the discharge outlets can be formed between the connecting flow channels.

[0090] The electrode area is equipped with a labyrinthine flow channel structure. The first test plate has a circular geometry; the diameter of the first test plate is 1000 cm; and the thickness of the first test plate is 5 mm.

[0091] (2) Processing the second test board

[0092] Another thin, plate-shaped solid pure nickel metal plate is obtained through processing. This plate has a first surface, a second surface, and a peripheral side surface, with two current collectors provided on the peripheral side surface. These current collectors are arranged at a 15° offset from the current collectors on the first test plate.

[0093] Four flow channel holes penetrating the first and second surfaces are provided in the outer regions of the first and second surfaces. These flow channel holes are located within the electrode frame, and the area enclosed by the electrode frame is the electrode plate region. The size, shape, and position of the flow channel holes correspond one-to-one with the flow channel holes of the first electrode plate, resulting in the second test plate. There are four flow channel holes: the third and fourth flow channel holes are feed holes, and the first and second flow channel holes are discharge holes. The size, shape, and position of the feed holes are consistent with those of the feed holes on the first test plate; the size, shape, and position of the discharge holes are consistent with those of the discharge holes on the first test plate; two or more flow channel holes communicate with the electrode plate region; a grid-like flow guiding structure is provided within the communicating region. The flow direction formed by the communicating flow channel holes is arranged intersecting with the flow direction of the first test plate; the third flow channel hole in the feed hole communicates with the first surface of the second test plate; the second flow channel hole in the discharge hole communicates with the first surface of the second test plate.

[0094] The electrode region is made of solid metal and has a labyrinthine flow channel structure. The geometry and dimensions of the second test plate are identical to those of the first test plate.

[0095] (3) Processing insulation boards

[0096] A sheet-like polyetheretherketone solid plate with a first surface, a second surface, and peripheral sides is obtained. Multiple flow channel holes are provided on the first and second surfaces, and the size, shape, and position of the flow channel holes correspond one-to-one with the flow channel holes on the first and second test plates.

[0097] There are four flow channel holes, two of which are feed holes and the other two are discharge holes; the size, shape and position of the feed holes are the same as those on the first test plate; the size, shape and position of the discharge holes are the same as those on the first test plate.

[0098] The geometry of the insulating board is the same as that of the first and second test boards, and the thickness of the insulating board is 5mm.

[0099] Will as Figure 4 The first test board, insulating board, and second test board shown are arranged in accordance with... Figure 2 The device is installed in the electrolytic cell under test as shown, and the first test plate current collector, the second test plate current collector, and the current acquisition device are connected by CuAl alloy wires. The current acquisition device collects data as shown. Figure 5 The electrolytic cell current signal is shown.

[0100] Example 3

[0101] This embodiment provides a reverse current testing device for an electrolytic cell, the specific preparation process of which is as follows:

[0102] (1) Processing the first test board

[0103] A thin, plate-shaped nickel-copper alloy solid metal plate is obtained through processing. This metal plate has a first surface, a second surface, and a peripheral surface. The peripheral surface is provided with... Figure 6 The four collectors are shown.

[0104] Three flow channel holes penetrating the first and second surfaces are provided in the outer region of the first and second surfaces to form a first test plate. Of the three flow channel holes, the third flow channel hole is a feed hole, and the first and second flow channel holes are discharge holes. The feed hole is located at the bottom of the first test plate; the discharge holes are located at the top of the first test plate; the discharge holes are symmetrically arranged at the top of the first test plate; the feed hole is connected to the first surface of the first test plate; the first flow channel hole of the two discharge holes is connected to the first surface of the first test plate; the feed hole is flat; the discharge hole is flat.

[0105] Within the connecting area, a comb-shaped first flow guiding structure and a second flow guiding structure are provided. The connecting flow channels can form a flow direction from the feed port to the first flow channel, and the electrode area has a flat plate structure.

[0106] The first test plate has a circular geometry, a diameter of 1850 cm, and a thickness of 8 mm.

[0107] (2) Processing the second test board

[0108] Another thin, plate-shaped nickel-copper alloy solid metal plate is obtained through processing. This plate has a first surface, a second surface, and a peripheral side surface, on which four current collectors are provided. These current collectors are arranged at a 10° offset from the current collectors on the first test plate.

[0109] Three flow channel holes penetrating the first and second surfaces are provided on the outer regions of the first and second surfaces. The flow channel holes are located within the electrode frame, and the area enclosed by the electrode frame is the electrode plate area. The size, shape, and position of the flow channel holes correspond one-to-one with the flow channel holes of the first electrode plate to obtain the second test plate.

[0110] Two flow channels are connected to the electrode plate area, and a comb-shaped first and second flow guiding structure are arranged within the connecting area. The flow direction formed by the connected flow channels is arranged intersecting with the flow direction of the first test plate; there are three flow channels: the third flow channel is the feed port, and the first and second flow channels are the discharge ports; the size, shape, and position of the feed port are the same as those on the first test plate; the size, shape, and position of the discharge port are the same as those on the first test plate; the feed port is connected to the first surface of the second test plate; the second flow channel in the discharge port is connected to the first surface of the second test plate.

[0111] The electrode area is made of solid metal material and has a flat plate structure. The geometry and size of the second test plate are the same as those of the first test plate.

[0112] (3) Processing insulation boards

[0113] The process yields a solid plate composed of thin sheets of polyethylene, glass fiber, and polyethylene laminates, having a first surface, a second surface, and peripheral sides. Multiple flow channel holes are provided on the first and second surfaces, with the size, shape, and position of the flow channel holes corresponding one-to-one with the flow channel holes on the first and second test plates.

[0114] There are three flow channel holes, of which the third flow channel hole is the feed hole, and the first and second flow channel holes are the discharge holes; the size, shape and position of the feed hole are the same as the feed hole on the first test plate; the size, shape and position of the discharge hole are the same as the discharge hole on the first test plate; the geometry of the insulating plate is the same as that of the first and second test plates, and the thickness of the insulating plate is 10mm.

[0115] Will as Figure 6 The first test board, insulating board, and second test board shown are arranged in accordance with... Figure 2 The device is installed in the electrolytic cell under test as shown, and the current collectors of the first and second test plates are connected by Ag wires. Inductive current acquisition devices are installed on the connecting wires to collect the current signal in the wires in real time. The collected current signal is shown in the figure. Figure 7 As shown.

[0116] Example 4

[0117] The only difference from Embodiment 1 is that: three flow channel holes penetrating the first and second surfaces are provided in the outer regions of the first and second surfaces of the first test plate, the insulating plate, and the second test plate, wherein the flow channel hole at the bottom is the inlet and the one at the top is the outlet.

[0118] The obtained first test board, insulating board, and second test board are arranged according to... Figure 2 The device is installed in the electrolytic cell under test as shown, and the first test plate current collector, the second test plate current collector, and the current acquisition device are connected by pure Cu wires. The reverse current signal of the electrolytic cell is acquired by the current acquisition device. Figure 3 As shown.

[0119] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An electrolyzer reverse current test apparatus, characterized by, The application relates to a test plate, which comprises: a first test plate having a first surface, a second surface and a peripheral side, the first test plate comprising a polar plate region provided with flow channels and a polar frame region arranged around the polar plate region, at least three first flow channel holes being arranged on the polar frame region in a spaced manner, each of the first flow channel holes penetrating the first surface and the second surface, and the side wall of at least one of the first flow channel holes being in communication with the polar plate region of the first surface; at least one first current collecting lug being arranged on the peripheral side of the first test plate; a second test plate having a first surface, a second surface and a peripheral side, the second test plate comprising a polar plate region provided with flow channels and a polar frame region arranged around the polar plate region, at least three second flow channel holes being arranged on the polar frame region in a spaced manner, each of the second flow channel holes penetrating the first surface and the second surface, the position and shape of the second flow channel holes corresponding to those of the first flow channel holes, and the side wall of at least one of the second flow channel holes being in communication with the polar plate region of the first surface; at least one second current collecting lug being arranged on the peripheral side of the second test plate; an insulating plate, the insulating plate being provided with at least three third flow channel holes, each of the third flow channel holes penetrating the opposite two plate surfaces of the insulating plate, and the position and shape of the third flow channel holes corresponding to those of the first flow channel holes and the second flow channel holes; in a working state, the insulating plate is arranged between the first test plate and the second test plate, and the first current collecting lug and the second current collecting lug are used for connecting wires.

2. The cell reverse current test apparatus of claim 1, wherein, The edge of the polar frame region of the first test plate is provided with a first flow guiding structure, and the first flow channel holes are in communication with the polar plate region of the first test plate by means of the first flow guiding structure; The edge of the polar frame region of the second test plate is provided with a second flow guiding structure, and the second flow channel holes are in communication with the polar plate region of the second test plate by means of the second flow guiding structure.

3. The cell reverse current test apparatus of claim 2, wherein, The shapes of the first flow guiding structure and the second flow guiding structure are independently corrugated, fence-shaped, comb-shaped, tooth-shaped, grid-shaped, porous or foamed.

4. The cell reverse current test apparatus of claim 3, wherein, The first flow channel holes form a first flow direction by means of the first flow guiding structure, the second flow channel holes form a second flow direction by means of the second flow guiding structure, and the first flow direction and the second flow direction are arranged in a cross manner.

5. The cell reverse current test apparatus of claim 1, wherein, The number of the first flow channel holes, the second flow channel holes and the third flow channel holes is 3, 4 or 6; when the number is 3, one feeding hole and two discharging holes are included; when the number is 4, two feeding holes and two discharging holes are included; when the number is 6, three feeding holes and three discharging holes are included.

6. The cell reverse current test apparatus of claim 5, wherein, The feeding holes are distributed at the bottom of the first test plate, the second test plate and the insulating plate; The discharging holes are distributed at the upper part of the first test plate, the second test plate and the insulating plate; The shape of the feeding holes is circular, square, flat, oval or semicircular; The shape of the discharging holes is circular, square, flat, oval or semicircular.

7. The cell reverse current test apparatus of claim 1, wherein, The first current collecting lug and the second current collecting lug are arranged in an interlaced manner to form a safety angle, and the safety angle is 5-100 degrees.

8. The cell reverse current test apparatus of claim 1, wherein, The first test plate, the second test plate and the insulation plate have a consistent geometry and size, the geometry being square, rectangular or circular.

9. The cell reverse current test apparatus of claim 8, wherein, When the geometry is square or rectangular, the size includes length, width and thickness, the length and width being 5 cm-500 cm, and the thickness being 1 mm-50 mm.

10. The cell reverse current test apparatus of claim 8 wherein, When the geometry is circular, the size includes diameter and thickness, the diameter being 5 cm-500 cm, and the thickness being 1 mm-50 mm.

Images