Reverse current testing device for electrolytic cell and reverse current testing method for alkaline electrolytic cell

Abstract

The invention discloses an electrolytic bath reverse current testing device and an alkaline electrolytic bath reverse current testing method, and relates to the technical field of water electrolysis hydrogen production. According to the electrolytic bath reverse current testing device, on one hand, the magnitude and the change condition of the reverse current in the electrolytic bath can be measured in real time, the state of the electrolytic bath can be mastered in real time, and therefore data support is provided for electrode testing and development; 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] The present invention relates to the technical field of hydrogen production by electrolysis of water, and in particular to a reverse current testing device for an electrolytic cell and a reverse current testing method for an alkaline electrolytic cell. Background Art

[0002] Traditional fossil fuel hydrogen production produces a large amount of carbon emissions, while alkaline water electrolysis driven by renewable energy can achieve a green hydrogen production process with zero carbon emissions, which will help promote the transformation of the energy structure to clean energy and meet the needs of future low-carbon or even zero-carbon energy systems. As a clean and efficient secondary energy source, hydrogen energy has the advantages of high energy density, storability and transportation, and has broad application prospects in fuel cell vehicles, distributed power generation, energy storage and other fields. As one of the important technologies for large-scale production of hydrogen, alkaline water electrolysis hydrogen production is crucial to the development of the hydrogen energy industry and can provide a stable and reliable hydrogen source for various hydrogen energy applications. Alkaline water electrolysis hydrogen production is one of the earliest developed and most mature water electrolysis hydrogen production technologies, with a history of more than 100 years. Its equipment and process are relatively stable, and it has been applied on a certain scale in the industrial field.

[0003] However, since alkaline water electrolysis uses a liquid electrolyte for hydrogen production, reverse currents of a certain intensity can be generated between the cathode and anode due to power fluctuations, electrode inhomogeneity, mismatched electrode installation, defective or improper diaphragm installation, or improper operation. This can change the potential and current direction on the electrode surface, potentially converting areas of the electrode that were originally in a reducing environment into an oxidizing environment, and vice versa. For example, at the cathode (hydrogen evolution electrode), reverse currents can cause oxidation, leading to oxidative 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. After experiencing the impact of reverse current, the microstructure of the electrode surface is destroyed. The originally uniform and orderly catalyst layer or active layer may peel off or agglomerate. For example, in the case of oxygen evolution electrodes, the active oxide coating on its surface may collapse under the action of reverse current, significantly reducing the electrode's activity in the electrochemical reaction. This in turn increases the overpotential required for subsequent normal electrolysis and increases energy consumption. In addition, the presence of reverse current may accelerate the aging and degradation process of the diaphragm material, thereby increasing the risk of failure inside the electrolyzer. For example, safety accidents may be caused by local overheating, gas leakage and other problems. Especially in large-scale industrial application scenarios, once such safety problems occur, the consequences are more serious.

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

[0005] In view of this, the present invention is proposed. Summary of the Invention

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

[0007] The present invention is achieved in that:

[0008] In a first aspect, the present invention provides an electrolytic cell reverse current testing device, comprising:

[0009] A first test plate having a first surface, a second surface, and a peripheral side surface, wherein the first test plate includes a plate area having a flow channel and a pole frame area disposed around the plate area, at least three first flow channel holes being spaced apart on the pole frame area, each of the first flow channel holes penetrating the first surface and the second surface, wherein a sidewall of at least one of the first flow channel holes is in communication with the plate area on the first surface; and at least one first current collecting lug is disposed on the peripheral side surface of the first test plate;

[0010] A second test plate having a first surface, a second surface, and a peripheral side surface, the second test plate including a plate area provided with a flow channel and a pole frame area provided around the plate area, at least three second flow channel holes being provided at intervals on the pole frame area, each second flow channel hole penetrating the first surface and the second surface, the position and shape of the second flow channel hole corresponding to the first flow channel hole, wherein a sidewall of at least one of the second flow channel holes is in communication with the plate area on the first surface; at least one second current collecting ear being provided on the peripheral side surface of the second test plate;

[0011] an insulating plate, wherein at least three third flow channel holes are provided on the insulating plate, each of the third flow channel holes passes through two opposite plate surfaces of the insulating plate, and the position and shape of the third flow channel holes correspond to those of the first flow channel holes and the second flow channel holes;

[0012] In a working state, the insulating plate is located between the first test plate and the second test plate, and the first current collecting lug and the second current collecting lug are used to connect wires.

[0013] In an optional embodiment, a first flow guide structure is provided at the edge of the pole frame area of ​​the first test plate, and the first flow channel hole is connected to the pole plate area of ​​the first test plate by utilizing the first flow guide structure;

[0014] A second flow guide structure is provided at the edge of the pole frame area of ​​the second test plate, and the second flow channel hole is connected to the pole plate area of ​​the second test plate by utilizing the second flow guide structure.

[0015] In an optional embodiment, 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 foam-shaped.

[0016] In an optional embodiment, the first flow channel hole uses a first flow guide structure to form a first flow direction, and the second flow channel hole uses a second flow guide structure to form a second flow direction, and the first flow direction and the second flow direction are arranged crosswise.

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

[0018] When the number is 3, it includes one feed hole and two discharge holes;

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

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

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

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

[0023] The shape of the feed hole is round, square, flat, oval or semi-arc;

[0024] The shape of the discharge hole is round, square, flat, oval or semi-arc.

[0025] In an optional embodiment, the first collecting ears and the second collecting ears are staggered to form a safety angle, and the safety angle is 5° to 100°.

[0026] In an optional embodiment, the first test plate, the second test plate and the insulating plate have consistent geometric shapes and sizes, and the geometric shapes are square, rectangular or circular;

[0027] When the geometric shape is square or rectangular, the dimensions include length, width and thickness. The length and width are 5cm-500cm, and the thickness is 1mm-50mm.

[0028] When the geometric shape is circular, the size includes diameter and thickness, with the diameter ranging from 5cm to 500cm and the thickness ranging from 1mm to 50mm.

[0029] In an optional embodiment, the material of the first test plate and the second test plate are independently 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;

[0030] Preferably, the material of the insulating plate is selected from at least one of a polymer insulating material, a ceramic material, and a composite material; wherein the polymer insulating material includes polytetrafluoroethylene, polyphenylene sulfide, polyetheretherketone, polyethylene, polyester, polyimide, epoxy resin, silicone resin, phenolic resin, polyester, polybutadiene, and rubber; the ceramic material includes aluminum oxide, zirconium oxide, nickel oxide, chromium oxide, titanium oxide, titanium nitride, silicon carbide, silicon nitride, and chromium carbide; the composite material includes at least one of glass fiber, resin fiber, polyester fiber, a polymer insulating material, and a ceramic material;

[0031] Preferably, the insulating board is a multi-layer structure formed by stacking layers one by one.

[0032] In a second aspect, the present invention provides a method for testing reverse current in an alkaline electrolytic cell, using the electrolytic cell reverse current testing device according to any one of the aforementioned embodiments, comprising:

[0033] installing the insulating plate between the first test plate and the second test plate;

[0034] Connecting the first current collecting lug, the second current collecting lug, and a current collection device via a current collecting wire, and collecting the current signal in the circuit via the current collection device; or connecting the first current collecting lug and the second current collecting lug via a current collecting wire, and collecting the current in the circuit via an inductive current collection device;

[0035] Preferably, the collecting wire is made of one or more strands of conductive material, and the conductive material is Cu and Cu-based alloys, Al and Al-based alloys, or Ag and Ag-based alloys.

[0036] The present invention has the following beneficial effects: When the electrolytic cell reverse current test device provided by the present invention is used, the electrolyte or gas-liquid mixture is allowed to flow through the first flow channel hole, the second flow channel hole and the third flow channel hole, the first current collecting ear and the second current collecting ear are used to collect the current flowing through the first test plate and the second test plate, the first current collecting ear and the second current collecting ear are used to connect the current collection device, and the current signal in the circuit is collected by the current collection device. During the process, oxygen and hydrogen are generated on the two surfaces of the two test plates respectively and flow out from the corresponding flow channel holes. On the one hand, the magnitude and change of the reverse current in the electrolytic cell can be measured in real time, which is conducive to real-time understanding of the state of the electrolytic cell, thereby providing data support for electrode testing and development. On the other hand, the actual current state in the electrolytic cell can also be tested in real time. By comparing the measured current with the output current of the power supply, the working state of the electrolytic cell or the electrolytic system can be more clearly monitored. Once there is a significant difference between the two, that is, there is an obvious fault in the surface electrolytic cell or the electrolytic system, which is conducive to ensuring the safety and stability of the electrolytic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 A structural diagram of the electrolytic cell reverse current testing device provided in Example 1;

[0039] Figure 2 This is a schematic diagram of the assembled electrolytic cell reverse current testing device provided in Example 1;

[0040] Figure 3 This is a graph of the electrolytic cell current signal collected by the current collection device in Example 1;

[0041] Figure 4 A structural diagram of the electrolytic cell reverse current testing device provided in Example 2;

[0042] Figure 5 This is a graph of the electrolytic cell current signal collected by the current collection device in Example 2;

[0043] Figure 6 A structural diagram of the electrolytic cell reverse current testing device provided in Example 3;

[0044] Figure 7 This is the electrolytic cell current signal diagram collected by the current collection device in Example 3.

[0045] Explanation of the main component symbols: 100-electrolytic cell reverse current test device; 001-plate area; 002-plate area; 003-first surface; 004-second surface; 005-side surface; 006-current collecting wire; 110-first test plate; 111-first flow channel hole; 112-first current collecting ear; 113-first guide structure; 120-second test plate; 121-second flow channel hole; 122-second current collecting ear; 123-second guide structure; 130-insulating plate; 131-third flow channel hole. DETAILED DESCRIPTION

[0046] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer are used. Where the manufacturer of the reagents or instruments is not specified, all are conventional products that can be purchased commercially.

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0048] 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 invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0049] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0050] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0051] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0052] Please refer to Figure 1 and Figure 2 An embodiment of the present invention provides an electrolytic cell reverse current testing device 100, comprising a first test plate 110, a second test plate 120 and an insulating plate 130. When in use, the insulating plate 130 is located between the first test plate 110 and the second test plate 120.

[0053] [First test board 110]

[0054] The first test plate 110 includes a plate area 001 provided with a flow channel and a pole frame area 002 arranged around the plate area 001, and a flow channel is provided on the plate area 001 for circulating a reaction medium, such as an electrolyte. The first test plate 110 has a first surface 003, a second surface 004 and a peripheral side 005, and the edge of the pole frame area 002 of the first test plate 110 (such as on the peripheral side 005) is provided with at least one first current collecting ear 112. At least three first flow channel holes 111 are spaced apart on the pole frame area 002, and each first flow channel hole 111 runs through two opposite plate surfaces of the first test plate 110 (i.e., runs through the first surface 003 and the second surface 004), and at least two first flow channel holes 111 are connected to the plate area 001 on the first test plate 110 and flow out from the channel on the plate area 001. Specifically, the sidewall of at least one first flow channel hole 111 is connected to the plate area 001 of the first surface 003. Since oxygen is generated on one surface and hydrogen is generated on the other surface during the process, two different flow channel holes are used to discharge the generated gases respectively.

[0055] A first flow guide structure 113 is provided at the edge of the electrode frame region 002 of the first test plate 110. This first flow guide structure 113 connects the first flow channel holes 111 to the electrode plate region 001 of the first test plate 110. In other words, at least one first flow channel hole 111 connects to the electrode plate region 001 of the first surface 003 via the first flow guide structure 113. Specifically, the electrode plate region 001 can be made of a solid metal material and can be provided with one or more of the following flow channel structures: a papillary, reciprocating, labyrinth, serpentine, corrugated, or mesh-shaped.

[0056] In some embodiments, the first flow-guiding structures 113 are independently shaped in a corrugated, fence-like, comb-like, tooth-like, grid-like, porous, or foam-like manner. Each of these structures provides a flow channel, enabling communication between the first flow channel holes 111 and the electrode plate region 001. The first flow-guiding structures 113 can be used to establish a specific flow direction. Specifically, the terms "corrugated" and "fence-like" describe the shape of an extended channel. The "corrugated" shape indicates that the channel is not linear but rather has reciprocating twists and turns; the "fence-like" shape indicates that the channel is composed of multiple rectangular channels.

[0057] 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.

[0058] [Second test board 120]

[0059] The second test plate 120 is similar to the structure of the first test plate 110. The second test plate 120 includes a hollow pole plate area 001 and a pole frame area 002 arranged around the pole plate area 001. A flow channel is provided on the pole plate area 001 for circulating 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 005. The edge of the pole frame area 002 of the second test plate 120 (such as on the peripheral side 005) is provided with at least one second current collecting ear 122. At least three second flow channel holes 121 are spaced apart on the pole frame area 002. Each second flow channel hole 121 runs through two relative plate surfaces of the second test plate 120 (i.e., runs through the first surface 003 and the second surface 004). The size, shape and position of multiple second flow channel holes 121 correspond one to one with multiple first flow channel holes 111. At least two second flow channel holes 121 are connected to the pole plate area 001 on the second test plate 120 to output the gas generated on the corresponding surface. Specifically, the sidewall of at least one second flow channel hole 121 is connected to the electrode plate area 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 separately through two different flow channels.

[0060] A second flow guide structure 123 is provided at the edge of the electrode frame region 002 of the second test plate 120. This second flow guide structure 123 connects the second flow channel holes 121 to the electrode plate region 001 of the second test plate 120. In other words, at least one second flow channel hole 121 connects to the electrode plate region 001 of the first surface 003 via the second flow guide structure 123. Specifically, the electrode plate region 001 can be made of a solid metal material and can be provided with one or more of the following flow channel structures: a papillary, reciprocating, labyrinth, serpentine, corrugated, or mesh-shaped.

[0061] Furthermore, the first guide structure 113 on the first test plate 110 and the second guide structure 123 on the second test plate 120 may have the same or different shapes, such as corrugated, fence-shaped, comb-shaped, tooth-shaped, grid-shaped, porous or foam-shaped.

[0062] Furthermore, the first flow channel hole 111 forms a first flow direction using the first flow guide structure 113, and the second flow channel hole 121 forms a second flow direction using the second flow guide structure 123. The first flow direction and the second flow direction are arranged crosswise to achieve cross flow, so as to better separate different reaction media.

[0063] Furthermore, the first collecting lug 112 is located on the peripheral side of the first test plate 110, and the second collecting lug 122 is located on the peripheral side of the second test plate 120. The first collecting lug 112 and the second collecting lug 122 are staggered to form 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. The "safety angle" means that the positions of the two collecting lugs do not completely correspond, and there is a certain degree of misalignment. The misaligned angle is the safety angle. Setting a safety angle can improve operational safety and avoid safety accidents caused by short circuits in the collecting lugs.

[0064] 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.

[0065] [Insulation plate 130]

[0066] The insulating plate 130 is made of a solid insulating material and similarly has a first surface, a second surface, and a peripheral side surface. A plurality of third flow passage holes 131 are provided on the insulating plate 130. Each third flow passage hole 131 extends through two opposing surfaces of the insulating plate 130. The size, position, and shape of the plurality of third flow passage holes 131 correspond to those of the first flow passage holes 111 and the second flow passage holes 121. In other words, the number of first flow passage holes 111, the second flow passage holes 121, and the third flow passage holes 131 are identical, and their positions correspond after installation.

[0067] In operation, insulating plate 130 is located between first test plate 110 and second test plate 120 to separate first test plate 110 from second test plate 120. First collecting lug 112 and second collecting lug 122 are used to connect wires. Collecting wire 006 connects first collecting lug 112 and second collecting lug 122 to a current collection device, which collects current signals in the circuit.

[0068] Furthermore, the material of the insulating plate 130 is not limited, and can be selected from at least one of a polymer insulating material, a ceramic material, and a composite material, and can be any one or more of the above. Polymer insulating materials include polytetrafluoroethylene, polyphenylene sulfide, polyetheretherketone, polyethylene, polyester, polyimide, epoxy resin, silicone resin, phenolic resin, polyester, polybutadiene, and rubber; ceramic materials include aluminum oxide, zirconium oxide, nickel oxide, chromium oxide, titanium oxide, titanium nitride, silicon carbide, silicon nitride, and chromium carbide; and composite materials include at least one of glass fiber, resin fiber, polyester fiber, a polymer insulating material, and a ceramic material, and can be any one or more of the above.

[0069] In some embodiments, the insulating plate 130 may be a multi-layer structure formed by stacking layers one by one. The specific preparation process is not limited and may be an existing stacking process. The material of each layer can be independently selected from at least one of the above-mentioned insulating plate materials (polymer insulating material, ceramic material, and composite material).

[0070] In some embodiments, the number of first flow channel holes 111, second flow channel holes 121, and third flow channel holes 131 is 3, 4, or 6. When the number is 3, it can include one feed hole and two discharge holes; when the number is 4, it can include two feed holes and two discharge holes; when the number is 6, it can include three feed holes and three discharge holes. The feed holes can be distributed at the bottom of the first test plate 110, the second test plate 120, and the insulating plate 130; the discharge holes can 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.

[0071] The shapes of the feed hole and the discharge hole are not limited. For example, the feed hole can be circular, square, flat, elliptical or semi-arc, and the discharge hole can be circular, square, flat, elliptical or semi-arc.

[0072] Furthermore, the first test plate 110, the second test plate 120 and the insulating plate 130 have the same geometric shape and size, and the geometric shape can be square, rectangular or circular. When the geometric shape is square or rectangular, the size includes length, width and thickness, and the length and width are 5cm-500cm (such as 5cm, 10cm, 50cm, 100cm, 150cm, 200cm, 250cm, 300cm, 350cm, 400cm, 450cm, 500cm, etc.), and the thickness is 1mm-50mm (such as 1mm, 5mm, 10mm, 20mm, 30mm, 40mm, 50mm, etc.). mm, etc.); when the geometric shape is circular, the size includes diameter and thickness, the diameter is 5 cm-500 cm (such as 5 cm, 10 cm, 50 cm, 100 cm, 150 cm, 200 cm, 250 cm, 300 cm, 350 cm, 400 cm, 450 cm, 500 cm, etc.), and the thickness is 1 mm-50 mm (such as 1 mm, 5 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, etc.).

[0073] An embodiment of the present invention further provides a method for testing reverse current in an alkaline electrolytic cell. The method utilizes an electrolytic cell reverse current testing device 100 provided by an embodiment of the present invention, comprising: installing 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 collecting lug 112, a second current collecting lug 122, and a current collection device are connected via current collecting wires, and the current collection device collects current signals in the circuit.

[0074] In other embodiments, the first current collecting ear 112 and the second current collecting ear 122 may be directly connected via a current collecting wire, and the current in the circuit may be collected via an inductive current collecting device.

[0075] Furthermore, the collecting wire provided in the embodiment of the present invention is made of one or more strands of conductive material with extremely low resistivity, and the conductive material is Cu and Cu-based alloys, Al and Al-based alloys, or Ag and Ag-based alloys. The type of conductive material can be any one or more of the above.

[0076] In some embodiments, multiple test units consisting of the first test plate 110 , the insulating plate 130 , and the second test plate 120 may be installed in an electrolytic cell to monitor the currents of multiple cells or electrodes in the electrolytic cell.

[0077] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0078] Example 1

[0079] This embodiment provides an electrolytic cell reverse current testing device, the specific preparation process of which is as follows:

[0080] (1) Processing the first test board

[0081] A thin plate-shaped solid metal plate 316 is obtained by processing. The metal plate has a first surface, a second surface and a peripheral side surface. A current collecting ear is provided on the peripheral side surface.

[0082] Four flow channel holes are provided on the outer regions of the first and second surfaces, penetrating the first and second surfaces, to obtain a first test plate. Of the four flow channel holes, the two at the bottom are feed holes, and the two at the top are discharge holes. The feed holes are 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; one 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.

[0083] A corrugated flow guide structure is provided in the interconnected area, and a certain flow direction can be formed between the interconnected flow channel holes. A papillary flow channel structure is provided in the plate area.

[0084] The first test plate has a circular geometry; a diameter of 1500 cm; and a thickness of 7 mm.

[0085] (2) Processing the second test board

[0086] Another thin plate 316 solid metal plate is obtained by processing, and the plate has a first surface, a second surface and a peripheral side surface, and a current collecting ear is provided on the peripheral side surface. The current collecting ear is arranged at a 15° staggered arrangement with the current collecting ear on the first test plate.

[0087] Four flow channel holes are provided in the outer areas of the first surface and the second surface, passing through the first surface and the second surface. The flow channel holes are provided in the pole frame, and the area surrounded by the pole frame is the pole plate area. The size, shape and position of the flow channel holes correspond one-to-one to the flow channel holes of the first pole plate, thereby obtaining a second test plate. There are four flow channel holes, of which the two provided at the bottom are feed holes, and the two provided at the top are discharge holes; the size, shape and position of the feed holes are consistent with the feed holes on the first test plate; the size, shape and position of the discharge holes are consistent with the discharge holes on the first test plate; at least one feed hole and one discharge hole in the flow channel holes are simultaneously connected to the first surface pole plate area; a corrugated flow guide structure is provided in the connected area. The flow direction formed by the connected flow channel holes is arranged crosswise with the flow direction of the first test plate.

[0088] The plate area is made of solid metal material and is provided with a papillary flow channel structure. The second test plate has the same geometric shape and size as the first test plate.

[0089] (3) Processing of insulation boards

[0090] A thin sheet of polytetrafluoroethylene solid plate having a first surface, a second surface and a peripheral side surface is processed, and a plurality of flow channel holes penetrating the first surface and the second surface are provided on the first surface and the second surface. The size, shape and position of the flow channel holes correspond one-to-one to the flow channel holes on the first test plate and the second test plate.

[0091] There are four flow channel holes, two of which are located at the bottom for feed holes, and two located at the top for discharge holes. The size, shape, and position of the feed holes are consistent with those on the first test plate; the size, shape, and position of the discharge holes are consistent with those on the first test plate; the geometric shape of the insulation plate is consistent with that of the first and second test plates; the thickness of the insulation plate is 5 mm.

[0092] will be as Figure 1 The first test board, the insulating board and the second test board are shown as follows Figure 2 The electrolytic cell to be tested is loaded into the electrolytic cell in the manner shown, and the first test plate current collecting ear, the second test plate current collecting ear and the current collecting device are connected through pure Cu wires, and the current collecting device collects the current as shown. Figure 3 The electrolyzer current signal is shown.

[0093] Example 2

[0094] This embodiment provides an electrolytic cell reverse current testing device, the specific preparation process of which is as follows:

[0095] (1) Processing the first test board

[0096] A thin plate-shaped pure nickel solid metal plate is obtained by processing. The metal plate has a first surface, a second surface and a peripheral side surface. Two current collecting ears are arranged on the peripheral side surface.

[0097] Four flow holes are provided in the outer regions of the first and second surfaces, extending through the first and second surfaces, to form a first test plate. Of the four flow holes, the third and fourth flow holes are feed holes, and the first and second flow holes are discharge holes. The feed holes are arranged at the bottom of the first test plate; the feed holes are symmetrically arranged at the bottom of the first test plate; the discharge holes are arranged at the upper portion of the first test plate; the discharge holes are symmetrically arranged at the upper portion of the first test plate; the fourth flow hole of the two feed holes is connected to the first surface of the first test plate; the first flow 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; and a grid-like flow guide structure is provided in the connecting region. A flow direction from the feed hole to the discharge hole can be formed between the connected flow holes.

[0098] The plate area is provided with a maze-like flow channel structure. The geometric shape of the first test plate is circular; the diameter of the first test plate is 1000 cm; and the thickness of the first test plate is 5 mm.

[0099] (2) Processing the second test board

[0100] Another thin plate-shaped pure nickel solid metal plate is obtained by processing. The plate has a first surface, a second surface and a peripheral side surface. Two current collecting ears are provided on the peripheral side surface. The current collecting ears are arranged at a 15° staggered arrangement with the current collecting ears on the first test plate.

[0101] Four flow channel holes are provided in the outer areas of the first surface and the second surface, passing through the first surface and the second surface. The flow channel holes are provided in the pole frame, and the area surrounded by the pole frame is the pole plate area. The size, shape and position of the flow channel holes correspond one-to-one to the flow channel holes of the first pole plate, thereby obtaining a second test plate. There are four flow channel holes, the third flow channel hole and the fourth flow channel hole are feed holes, and the first flow channel hole and the second flow channel hole are discharge holes; the size, shape and position of the feed hole are consistent with the feed hole on the first test plate; the size, shape and position of the discharge hole are consistent with the discharge hole on the first test plate; two or more flow channel holes in the flow channel holes are connected to the pole plate area; a grid-like flow guide structure is provided in the connected area. The flow direction formed by the connected flow channel holes is arranged crosswise with the flow direction of the first test plate; the third flow channel hole in the feed hole is connected to the first surface of the second test plate; the second flow channel hole in the discharge hole is connected to the first surface of the second test plate.

[0102] The plate area is made of solid metal material and is provided with a maze-like flow channel structure. The second test plate has the same geometric shape and size as the first test plate.

[0103] (3) Processing of insulation boards

[0104] A polyetheretherketone solid plate having a first surface, a second surface and a peripheral side surface is processed, and a plurality of flow channel holes penetrating the first surface and the second surface are provided on the first surface and the second surface. The size, shape and position of the flow channel holes correspond one-to-one to the flow channel holes on the first test plate and the second test plate.

[0105] 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 consistent with those on the first test plate. The size, shape and position of the discharge holes are consistent with those on the first test plate.

[0106] The geometry of the insulation board is consistent with that of the first test board and the second test board, and the thickness of the insulation board is 5 mm.

[0107] will be as Figure 4 The first test board, the insulating board and the second test board are shown as follows Figure 2 The electrolytic cell to be tested is loaded into the electrolytic cell in the manner shown, and the first test plate current collecting ear, the second test plate current collecting ear and the current collecting device are connected through CuAl alloy wires, and the current collecting device collects the current as shown. Figure 5 The electrolyzer current signal is shown.

[0108] Example 3

[0109] This embodiment provides an electrolytic cell reverse current testing device, the specific preparation process of which is as follows:

[0110] (1) Processing the first test board

[0111] A thin nickel-copper alloy solid metal plate is obtained by processing. The metal plate has a first surface, a second surface and a peripheral side surface. The peripheral side surface is provided with Figure 6 The four collecting ears are shown.

[0112] Three flow holes are provided in the outer regions of the first and second surfaces, extending through the first and second surfaces, to form a first test plate. Of the three flow holes, the third is a feed hole, and the first and second are discharge holes. The feed hole is located at the bottom of the first test plate, while the discharge hole is located at the upper portion of the first test plate. The discharge holes are symmetrically arranged at the upper portion of the first test plate. The feed hole communicates with the first surface of the first test plate, and the first of the two discharge holes communicates with the first surface of the first test plate. The feed hole is flat, and the discharge hole is flat.

[0113] A comb-shaped first flow guide structure and a second flow guide structure are provided in the interconnected area. The interconnected flow channel holes can form a flow direction from the feed hole to the first flow channel hole, and the plate area is a flat plate structure.

[0114] The first test plate has a circular geometry, a diameter of 1850 cm, and a thickness of 8 mm.

[0115] (2) Processing the second test board

[0116] Another thin nickel-copper alloy solid metal plate is obtained by processing. The plate has a first surface, a second surface, and a peripheral side surface. Four current collecting ears are provided on the peripheral side surface. The current collecting ears are arranged at a 10° staggered arrangement with the current collecting ears on the first test plate.

[0117] Three flow holes are provided outside the first and second surfaces, extending through the first and second surfaces. The flow holes are located within the electrode frame, and the area enclosed by the electrode frame constitutes the electrode plate area. The size, shape, and position of the flow holes correspond one-to-one with those of the first electrode plate, resulting in a second test plate.

[0118] Two of the flow channels connect to the electrode plate area, and a comb-shaped first and second flow guide structures are provided within the connecting area. The flow direction formed by the connected flow channels is arranged crosswise with the flow direction of the first test plate. There are three flow channels, 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 consistent with those on the first test plate; the size, shape, and position of the discharge hole are consistent with those on the first test plate. The feed hole connects to the first surface of the second test plate; and the second flow channel hole in the discharge hole connects to the first surface of the second test plate.

[0119] The plate area is made of solid metal material and has a flat plate structure. The second test plate has the same geometric shape and size as the first test plate.

[0120] (3) Processing of insulation boards

[0121] The processing obtains a solid plate having a first surface, a second surface and a peripheral side surface, which is a composite plate of thin sheets of polyethylene, glass fiber and polyethylene. A plurality of flow channel holes penetrating the first surface and the second surface are provided on the first surface and the second surface. The size, shape and position of the flow channel holes correspond one-to-one to the flow channel holes on the first test plate and the second test plate.

[0122] 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 consistent with the feed hole on the first test plate; the size, shape and position of the discharge hole are consistent with the discharge hole on the first test plate; the geometric shape of the insulating plate is consistent with the first and second test plates, and the thickness of the insulating plate is 10 mm.

[0123] will be as Figure 6 The first test board, the insulating board and the second test board are shown as follows Figure 2 The electrolytic cell to be tested is loaded into the test plate in the manner shown, and the first test plate current collecting ear and the second test plate current collecting ear are connected through Ag wires. Inductive current acquisition devices are respectively installed on the connecting wires to collect the current signal in the wires in real time. The collected current signal is as follows Figure 7 shown.

[0124] Example 4

[0125] The only difference from Example 1 is that three flow channel holes penetrating the first surface and the second surface are provided in the outer areas of the first surface and the second surface of the first test plate, the insulating plate and the second test plate, wherein the flow channel hole provided at the bottom is the feed port, and the one provided at the top is the discharge port.

[0126] The obtained first test board, insulating board and second test board were pressed Figure 2 The electrolytic cell to be tested is loaded into the test cell in the manner shown, and the first test plate current collecting ear, the second test plate current collecting ear and the current collection device are connected through pure Cu wires, and the reverse current signal of the electrolytic cell is collected by the current collection device. Figure 3 shown.

[0127] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An electrolytic cell reverse current testing device, characterized in that: include: A first test plate, having a first surface, a second surface and a peripheral side surface, wherein the first test plate comprises a plate area provided with a flow channel and a pole frame area arranged around the plate area, at least three first flow channel holes are arranged at intervals on the pole frame area, each of the first flow channel holes penetrates the first surface and the second surface, wherein a side wall of at least one of the first flow channel holes is connected to the plate area of ​​the first surface; at least one first current collecting ear is arranged on the peripheral side surface of the first test plate; A second test plate, having a first surface, a second surface and a peripheral side surface, wherein the second test plate comprises a plate area provided with a flow channel and a pole frame area arranged around the plate area, at least three second flow channel holes are arranged at intervals on the pole frame area, each of the second flow channel holes penetrates the first surface and the second surface, the position and shape of the second flow channel hole correspond to the first flow channel hole, wherein the side wall of at least one of the second flow channel holes is connected to the plate area of ​​the first surface; at least one second current collecting ear is arranged on the peripheral side surface of the second test plate; An insulating plate, wherein at least three third flow channel holes are provided on the insulating plate, each of the third flow channel holes penetrates two opposite plate surfaces of the insulating plate, and the position and shape of the third flow channel holes correspond to the first flow channel holes and the second flow channel holes; In a working state, the insulating plate is located between the first test plate and the second test plate, and the first current collecting lug and the second current collecting lug are used to connect wires.

2. The electrolytic cell reverse current testing device according to claim 1, characterized in that: A first flow guide structure is provided at the edge of the pole frame area of ​​the first test plate, and the first flow channel hole is connected to the pole plate area of ​​the first test plate by utilizing the first flow guide structure; A second flow guide structure is provided at the edge of the pole frame area of ​​the second test plate, and the second flow channel hole is connected to the pole plate area of ​​the second test plate by utilizing the second flow guide structure.

3. The electrolytic cell reverse current testing device according to claim 2, characterized in that: 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 foam-shaped.

4. The electrolytic cell reverse current testing device according to claim 3, characterized in that: The first flow channel hole uses the first flow guide structure to form a first flow direction, and the second flow channel hole uses the second flow guide structure to form a second flow direction, and the first flow direction and the second flow direction are arranged crosswise.

5. The electrolytic cell reverse current testing device according to claim 1, characterized in that: The number of the first flow channel holes, the second flow channel holes and the third flow channel holes are all 3, 4 or 6; When the number is 3, it includes one feed hole and two discharge holes; When the number is 4, it includes two feed holes and two discharge holes; When the number is 6, it includes three feeding holes and three discharging holes.

6. The electrolytic cell reverse current testing device according to claim 5, characterized in that: The feed holes are distributed at the bottom of the first test plate, the second test plate and the insulating plate; The discharge holes are distributed on the upper parts of the first test plate, the second test plate and the insulating plate; The shape of the feed hole is circular, square, flat, elliptical or semi-arc; The shape of the discharge hole is circular, square, flat, elliptical or semi-arc.

7. The electrolytic cell reverse current testing device according to claim 1, characterized in that: The first current collecting ears and the second current collecting ears are arranged alternately to form a safety angle, and the safety angle is 5° to 100°.

8. The electrolytic cell reverse current testing device according to claim 1, characterized in that: The first test plate, the second test plate and the insulating plate have consistent geometric shapes and sizes, and the geometric shape is square, rectangular or circular; When the geometric shape is a square or a rectangle, the dimensions include length, width and thickness, the length and width are 5 cm-500 cm, and the thickness is 1 mm-50 mm; When the geometric shape is circular, the dimensions include diameter and thickness, the diameter is 5 cm-500 cm, and the thickness is 1 mm-50 mm.

9. The electrolytic cell reverse current testing device according to claim 1, characterized in that: The materials of the first test plate and the second test plate are independently 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; Preferably, the material of the insulating plate is selected from at least one of a polymer insulating material, a ceramic material and a composite material; wherein the polymer insulating material includes polytetrafluoroethylene, polyphenylene sulfide, polyetheretherketone, polyethylene, polyester, polyimide, epoxy resin, silicone resin, phenolic resin, polyester, polybutadiene and rubber; the ceramic material includes aluminum oxide, zirconium oxide, nickel oxide, chromium oxide, titanium oxide, titanium nitride, silicon carbide, silicon nitride and chromium carbide; the composite material includes at least one of glass fiber, resin fiber, polyester fiber, the polymer insulating material and the ceramic material; Preferably, the insulating plate is a multi-layer structure formed by stacking layers one by one.

10. A method for testing reverse current of an alkaline electrolytic cell, characterized in that: The electrolytic cell reverse current testing device according to any one of claims 1 to 9 comprises: installing the insulating plate between the first test plate and the second test plate; The first current collecting ear, the second current collecting ear and a current collecting device are connected through a current collecting wire, and the current signal in the circuit is collected through the current collecting device; or the first current collecting ear and the second current collecting ear are connected through a current collecting wire, and the current in the circuit is collected through an inductive current collecting device; Preferably, the current collecting wire is made of one or more strands of conductive material, and the conductive material is Cu and Cu-based alloys, Al and Al-based alloys, or Ag and Ag-based alloys.

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