Three-dimensional electrode electrochemical device with descaling effect

Abstract

This invention proposes a three-dimensional electrode electrochemical device with descaling function. It is divided into a softening chamber and an oxidation chamber by a partition. The softening chamber contains multiple cylindrical electrode groups. Under the action of an external electric field, the cathode reaction generates a strongly alkaline environment to precipitate scale-forming ions in the water. A gas flushing mechanism and an external programmable DC regulated power supply effectively achieve automatic descaling. The three-dimensional electrode group in the oxidation chamber consists of several anode plates and cathode plates arranged alternately at equal intervals. Insulating baskets filled with particle packing are placed between adjacent electrode plates. Ultrasonic vibrating plates are integrated around the three-dimensional electrode group. A porous sieve plate and aeration pipeline are installed at the bottom of the three-dimensional electrode group. A spray mechanism with rotating nozzles is installed at the top of the oxidation chamber. The combination of the three-dimensional electrode group, ultrasonic assistance, and circulating spray enhances the oxidation efficiency. This invention removes multiple pollutants from water simultaneously and efficiently in a single reactor without the need for external reagents, through a series of electrochemical reactions. It has the advantages of high treatment efficiency, high automation, and small footprint.

Description

Technical Field

[0001] This utility model belongs to the technical field of electrochemical wastewater treatment, specifically relating to a three-dimensional electrode electrochemical device with descaling function. Background Technology

[0002] Electrochemical water treatment technology, under the influence of an applied electric field, causes a series of physical and chemical reactions in pollutants on the electrode surface or in the water, simultaneously removing or separating multiple pollutants. It boasts advantages such as high removal efficiency, wide applicability, and mild reaction conditions, making it widely used in various industrial wastewater treatments. However, traditional two-dimensional electrochemical devices for electrochemical softening and descaling are limited by cathode material and area, resulting in limited scale deposition on the cathode surface, low descaling efficiency, and difficulty in automation and high-efficiency descaling. When using traditional two-dimensional electrochemical devices for the oxidation removal of nitrogenous and organic pollutants, the limitations of unit electrode active area and mass transfer rate lead to low current efficiency and low throughput. Therefore, improvements are needed to traditional two-dimensional electrochemical devices to enhance their efficient descaling and automatic descaling capabilities while simultaneously strengthening their oxidative decomposition capacity. This allows for the simultaneous and efficient removal of multiple pollutants in water within a single reactor, improving their efficiency and practicality in treating complex industrial wastewater. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a three-dimensional electrode electrochemical device with descaling function to address the above-mentioned problems.

[0004] The embodiments of this application are implemented as follows:

[0005] This application provides a three-dimensional electrode electrochemical device with descaling function, characterized by comprising an electrochemical reactor. The upper sides of the electrochemical reactor are respectively provided with an inlet and an outlet. The upper space is divided into a softening chamber and an oxidation chamber by a partition. Multiple sets of cylindrical electrode groups are provided in the softening chamber, and the cylindrical electrode groups are electrically connected to an externally provided programmable DC regulated power supply. A three-dimensional electrode group is provided in the oxidation chamber, and the three-dimensional electrode group is electrically connected to an externally provided DC regulated power supply. A conical hopper is provided at the bottom of the electrochemical reactor corresponding to the bottom of the softening and oxidation chambers, and the bottom of the conical hopper is connected to a sludge discharge port. A gas flushing mechanism is provided inside the cylindrical electrode groups, and an aeration mechanism is provided at the bottom of the three-dimensional electrode groups. Both the gas flushing and aeration mechanisms are connected to an externally provided air compressor through pipelines. A spraying mechanism is provided at the top of the oxidation chamber, and the spraying mechanism includes multiple rotating nozzles, which are connected to an externally provided circulating water pump through circulation pipelines. An ultrasonic transducer is integrated around the three-dimensional electrode groups, and the ultrasonic transducer is connected to an externally provided ultrasonic generator.

[0006] In some optional embodiments, the cylindrical electrode assembly includes an inner cylindrical anode, an inner cylindrical anode terminal, an outer cylindrical cathode, and an outer cylindrical cathode terminal. The inner cylindrical anode terminal and the outer cylindrical cathode terminal are respectively connected to the positive and negative terminals of the programmable DC regulated power supply via insulated copper wires. The inner cylindrical anode and the outer cylindrical cathode are fixedly connected by a fixing member provided at the top end.

[0007] In some alternative embodiments, the fixing member is an annular sleeve, including an inner annular sleeve and an outer annular sleeve connected to each other. The inner annular sleeve is fitted over the top circular edge of the inner cylindrical cathode, and the outer annular sleeve is fitted over the top circular edge of the outer cylindrical anode. The terminals of the inner cylindrical anode and the outer cylindrical cathode both protrude from the annular sleeve.

[0008] In some alternative embodiments, the gas flushing mechanism includes a flushing pipe, which is vertically disposed in the gap between the inner cylindrical anode and the outer cylindrical cathode. The flushing pipe has evenly distributed air holes and is connected to the main air pipe through a flushing branch pipe. The main air pipe is connected to the air compressor, and the flushing branch pipe is equipped with a solenoid valve and an air flow meter.

[0009] In some alternative embodiments, the pores are evenly distributed on the side of the flushing air pipe facing the outer cylindrical cathode.

[0010] In some optional embodiments, the three-dimensional electrode assembly comprises multiple anode plates and cathode plates of equal size arranged alternately at intervals. A perforated insulating basket is provided in the gap between adjacent anode and cathode plates, and the insulating basket is filled with particle filler. The top of each anode plate is connected to an anode terminal, and the top of each cathode plate is connected to a cathode terminal. The anode and cathode terminals are connected to the DC regulated power supply via copper busbars. The bottoms of the anode and cathode plates are fixed by slotted plates. The top of the insulating basket is connected to an externally mounted electric lifting device via a lifting plate.

[0011] In some alternative embodiments, the aeration mechanism includes a porous sieve plate horizontally disposed at the bottom of the three-dimensional electrode assembly, and also includes an aeration branch pipe extending into the oxidation chamber, the aeration branch pipe being connected to the main air pipe, and the aeration branch pipe being equipped with a pressure regulating valve and an air flow meter.

[0012] In some alternative embodiments, the inner cylindrical anode is made of Ti / RuO2-IrO2, Ti / RuO2-TiO2, or Ti / IrO2-Ta2O5; the outer cylindrical cathode is a titanium mesh, stainless steel mesh, or nickel alloy mesh; the inner cylindrical anode and the outer cylindrical cathode are at the same height; the inner cylindrical anode has a diameter of 4.5-5.5 cm and a thickness of 3.5-4.5 mm; the outer cylindrical cathode has a diameter of 28-32 cm and a thickness of 1.5-2.5 mm; the outer cylindrical cathode is mesh-like with a mesh size of 0.5-1.5 mm.

[0013] In some optional embodiments, the anode plate is a chlorine-evolving Ti / RuO2-IrO2 electrode, and the cathode plate is a Ti plate; the particle filler is granular activated carbon, which can be walnut shells, coconut shells, or anthracite; the pore size of the insulating basket is 1-3 mm; the diameter of the particle filler is 4-8 mm, and the particle filler filling rate is 40-70%; the aperture of the porous sieve plate is 2-5 mm, and the opening rate is 60-80%; the spray angle of the rotating nozzle is 50-150°, and the spacing between the rotating nozzles is 10-15 cm.

[0014] In some optional embodiments, the outer diameter of the flushing air pipe is 16 mm, the distance between the air hole and the outer cylindrical cathode is 2.0-3.0 cm, and the diameter of the air hole is 2-4 mm; the diameter of the opening of the aeration branch pipe is 2-4 mm, and the opening interval is 1-3 cm.

[0015] The beneficial effects of this application are as follows: This application provides a three-dimensional electrode electrochemical device with descaling function, which integrates a softening chamber and an oxidation chamber in an electrochemical reactor. The softening chamber is descaled by a cylindrical electrode group and descaled by a gas flushing mechanism. The oxidation chamber can enhance oxidation efficiency through the setting of three-dimensional electrodes, ultrasonic assistance and circulating spray. No external reagents are required. Through a series of electrochemical reactions, multiple pollutants in water can be removed simultaneously and efficiently. It has the advantages of high treatment efficiency, high degree of automation and small footprint. It is of great significance in the field of industrial wastewater treatment that requires rapid and efficient removal of multiple pollutants, and is especially suitable for the treatment of high-salt and high-hardness organic wastewater. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1This is a schematic diagram of a three-dimensional electrode electrochemical device with descaling function in the embodiments of this application;

[0018] Figure 2 This is a top view of the three-dimensional electrode electrochemical device with descaling function in the embodiments of this application;

[0019] Figure 3 This is a schematic diagram of the cylindrical electrode assembly in an embodiment of this application. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0022] It should be understood that the sequence number of each step in the embodiment does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0023] 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.

[0024] The features and performance of this application will be further described in detail below with reference to the embodiments.

[0025] like Figure 1 , Figure 2As shown, this application provides a three-dimensional electrode electrochemical device with descaling function, including an electrochemical reactor 1. The upper parts of both sides of the electrochemical reactor are respectively provided with an inlet 2 and an outlet 3. The upper space is divided into a softening chamber 5 and an oxidation chamber 6 by a partition 4. Multiple sets of cylindrical electrode groups 7 are provided in the softening chamber, and the cylindrical electrode groups are electrically connected to an externally provided programmable DC regulated power supply 8. A three-dimensional electrode group 9 is provided in the oxidation chamber, and the three-dimensional electrode group is electrically connected to an externally provided DC regulated power supply 10. The lower part of the electrochemical reactor corresponds to the softening chamber and the oxidation chamber. The bottom of the chamber is provided with a conical hopper 11, and the bottom of the conical hopper is connected to the sludge discharge port; the cylindrical electrode group is provided with a gas flushing mechanism, and the bottom of the three-dimensional electrode group is provided with an aeration mechanism. Both the gas flushing mechanism and the aeration mechanism are connected to an external air compressor 12 through pipelines; the top of the oxidation chamber is provided with a spraying mechanism, which includes multiple rotating nozzles 13. The rotating nozzles are connected to an external circulating water pump 14 through circulation pipelines; the three-dimensional electrode group is surrounded by an ultrasonic transducer 15, which is connected to an external ultrasonic generator 16.

[0026] Furthermore, the cylindrical electrode assembly includes an inner cylindrical anode 701, an inner cylindrical anode terminal 702, an outer cylindrical cathode 703, and an outer cylindrical cathode terminal 704 (see...). Figure 3 The inner cylindrical anode terminal and the outer cylindrical cathode terminal are respectively connected to the positive and negative terminals of the programmable DC regulated power supply through insulated copper wires; the inner cylindrical anode and the outer cylindrical cathode are fixedly connected by a fixing member 705 set at the top end. The fixing member is an annular sleeve, including an inner annular sleeve and an outer annular sleeve connected to each other. The inner annular sleeve is sleeved on the top circular edge of the inner cylindrical cathode, and the outer annular sleeve is sleeved on the top circular edge of the outer cylindrical anode. The inner cylindrical anode terminal and the outer cylindrical cathode terminal both pass through the annular sleeve.

[0027] Under the influence of an external electric field, the localized strong alkaline environment generated by the cathode reaction in the softening chamber causes calcium and magnesium ions in the wastewater to migrate directionally towards the cathode and gradually deposit as precipitates on the surface of the outer cylindrical cathode to form a scale layer, thus completing the descaling process. At the same time, the microbubbles generated by the electrochemical reaction can also achieve the effect of air flotation to remove suspended solids. The anode reaction in the oxidation chamber generates a large number of active oxidants that simultaneously oxidize various pollutants in the water, such as COD, ammonia nitrogen, and total nitrogen.

[0028] Furthermore, the gas flushing mechanism includes a flushing air pipe 17, which is vertically positioned in the gap between the inner cylindrical anode and the outer cylindrical cathode. Air holes 18 are evenly distributed on the side of the flushing air pipe facing the outer cylindrical cathode. The flushing air pipe is connected to the main air pipe 20 via a flushing branch pipe 19. The main air pipe is connected to an air compressor. A solenoid valve 21 and an air flow meter 22 are installed on the flushing branch pipe. Air is aerated through the flushing air pipe to the outer cylindrical cathode, purging and breaking down the scale layer formed on the outer cylindrical cathode.

[0029] Furthermore, the three-dimensional electrode assembly includes multiple anode plates 901 and cathode plates 902 of equal size, arranged alternately at intervals. A perforated insulating basket 903 is provided in the gap between adjacent anode and cathode plates, and particle filler 904 is filled inside the insulating basket. The top of each anode plate is connected to an anode terminal 905, and the top of each cathode plate is connected to a cathode terminal 906. The anode and cathode terminals are connected to a DC regulated power supply via copper busbars. The bottoms of the anode and cathode plates are fixed by slotted plates. The top of the insulating basket is connected to an externally mounted electric lifting device 908 via a PVC lifting plate 907. The aeration mechanism includes a porous sieve plate 909, horizontally positioned at the bottom of the three-dimensional electrode assembly, and an aeration branch pipe 910 extending into the oxidation chamber. The aeration branch pipe is connected to the main air pipe and is equipped with a pressure regulating valve 911 and an air flow meter 912.

[0030] Under the influence of an electric field, the particle packing carries a positive charge at one end and a negative charge at the other, forming numerous microelectrodes, which improves the electrochemical oxidation efficiency. Activating the ultrasonic generator activates the electrodes, promoting the cleavage of water molecules to generate highly oxidizing hydroxyl radicals, further enhancing the electrochemical oxidation efficiency. When the effluent quality deteriorates, an electric lifting device is activated to lift the insulating basket outside the electrochemical reactor, allowing the particle packing inside to be replaced.

[0031] Furthermore, the inner cylindrical anode is made of Ti / RuO2-IrO2, Ti / RuO2-TiO2, or Ti / IrO2-Ta2O5, and is a stable DSA (Dimensionally Stable Anode) electrode with titanium as the substrate and a metal oxide active coating on the surface; the outer cylindrical cathode is a titanium mesh, stainless steel mesh, or nickel alloy mesh; the inner cylindrical anode and the outer cylindrical cathode are at the same height; the inner cylindrical anode has a diameter of 4.5-5.5 cm and a thickness of 3.5-4.5 mm; the outer cylindrical cathode has a diameter of 28-32 cm and a thickness of 1.5-2.5 mm; the outer cylindrical cathode is mesh-like with a mesh size of 0.5-1.5 mm; the outer diameter of the flushing air pipe is 16 mm, the distance between the air hole and the outer cylindrical cathode is 2.0-3.0 cm, and the air hole diameter is 2-4 mm.

[0032] Furthermore, the anode plate is a chlorine-evolving Ti / RuO2-IrO2 electrode, and the cathode plate is a Ti plate; the particle packing is granular activated carbon, which can be walnut shells, coconut shells, or anthracite; the pore size of the insulating basket is 1-3 mm; the diameter of the particle packing is 4-8 mm, and the particle packing filling rate is 40-70%; the aperture of the porous sieve plate is 2-5 mm, and the aperture ratio is 60-80%; the aperture diameter of the aeration branch pipe is 2-4 mm, and the aperture spacing is 1-3 cm; the spray angle range of the rotating nozzle is 50-150°, and the arrangement spacing of the rotating nozzle is 10-15 cm.

[0033] The work includes the following steps:

[0034] 1. Close the outlet, sludge discharge port, and circulating water pump, and open the inlet to allow wastewater to enter the electrochemical reactor until the water level reaches the outlet height. Then, turn on the programmable DC regulated power supply, DC regulated power supply, air compressor, and ultrasonic generator in sequence. The localized strong alkaline environment generated by the cathode reaction in the softening chamber causes calcium and magnesium ions in the wastewater to migrate directionally towards the cathode and gradually deposit as precipitates on the outer cylindrical cathode surface to form a scale layer, completing the descaling process. At the same time, the microbubbles generated by the electrochemical reaction can also achieve the effect of air flotation to remove suspended solids. The anode reaction in the oxidation chamber generates a large amount of active oxidants to simultaneously oxidize COD, ammonia nitrogen, and total nitrogen pollutants in the water.

[0035] 2. After the electrochemical reactor has been running for a period of time, the air compressor is turned on periodically, and the compressed air flow is controlled by the solenoid valve to blow away and break up the scale layer that has formed on the surface of the outer cylindrical cathode. The programmable DC regulated power supply automatically increases the current density periodically to generate a large amount of gas on the surface of the outer cylindrical cathode. The pressure generated on the surface of the outer cylindrical cathode by the microbubbles causes the stable scale layer that is gradually formed over the reaction time to be broken off and fall into the bottom cone. The sludge discharge port is opened periodically to discharge sludge.

[0036] 3. After the compressed air in the oxidation chamber is evenly distributed through the porous sieve plate, the particle packing in the three-dimensional electrode assembly remains in a suspended state. Under the action of the electric field, one end of the particle packing carries a positive charge and the other end carries a negative charge, forming countless microelectrodes, which improves the electrochemical oxidation efficiency. The ultrasonic generator is activated to activate the electrodes, promote the decomposition of water molecules to generate strong oxidizing hydroxyl radicals, and improve the electrochemical oxidation efficiency. When the effluent quality of the electrochemical reactor deteriorates, the electric lifting device is activated to lift the insulating basket to the outside of the electrochemical reactor and replace the particle packing in the insulating basket.

[0037] 4. When the wastewater in the electrochemical reactor reaches the set residence time (3-6 h), open the outlet to keep the electrochemical reactor in a continuous flow state; at the same time, turn on the circulating water pump for reflux, and adjust the spray water volume by changing the reflux ratio (120-150%) to increase the mass transfer efficiency and improve the utilization rate of active gas, thereby further improving the oxidation efficiency of the three-dimensional electrode group.

[0038] The working cathode current density of the indoor programmable DC regulated power supply for descaling is 20-30 A / m. 2 The anode current density during oxidation in a DC regulated power supply is 200-400 A / m. 2 The compressed air pressure is 0.5-0.6 MPa, the compressed air flushing cycle is 20-30 min, the flushing time is 3-5 min, and the gas volume per flush is 7-10 m³. 3 / m 2During descaling with a programmable DC regulated power supply, the cathode current density rises to 150-200 A / m. 2 The descaling cycle is 60-90 min, and the descaling time is 2-4 min.

[0039] The compressed air pressure in the oxidation chamber is 0.2-0.4 MPa, and the flow rate is 0.5-2.0 m³ / s. 3 / m 3 •h; The ultrasonic generator operates at a frequency of 30-40 kHz and a power density of 1.0-2.0 kW / m². 3 .

[0040] Example 1

[0041] In this embodiment, the parameters of the three-dimensional electrode electrochemical device with descaling function are as follows:

[0042] In the softening chamber, the inner cylindrical anode is a Ti / RuO2-IrO2 electrode, and the outer cylindrical cathode is a stainless steel mesh with a mesh size of 1.0 mm. The distance between the pores and the outer cylindrical cathode is 2.0 cm, and the pore diameter is 2-4 mm. In the oxidation chamber, the anode is a chlorine-evolving Ti / RuO2-IrO2 electrode, the cathode plate is a Ti plate, and the plate spacing is 10 cm. The particle packing is granular activated carbon made from anthracite, with a diameter of 6 mm and a filling rate of 60%. The pores of the porous insulating basket are 2 mm. The perforated sieve plate at the bottom of the electrode assembly has an opening diameter of 3 mm and an opening rate of 70%. The opening diameter of the aeration bypass pipeline is 2 mm, and the opening spacing is 3 cm. The spray angle range of the rotating nozzles at the top of the oxidation chamber is 60-120°, and the nozzle spacing is 10 cm.

[0043] In specific implementation, the saline wastewater from a special point source of refining and chemical processing in a coastal refining and chemical enterprise in Guangdong was taken as the treatment target. The influent water quality was as follows: pH value 6.87, suspended solids 325 mg / L, petroleum hydrocarbons 42.4 mg / L, total hardness 2240 mg / L, ammonia nitrogen 110 mg / L, COD 1950 mg / L, and chloride ion concentration 10500 mg / L.

[0044] The working cathode current density during descaling in the softening chamber is 30 A / m. 2 During descaling, the cathode current density automatically increases to 160 A / m. 2 The descaling cycle is 60 min, and the descaling time is 3 min. During descaling, the compressed air pressure is 0.5 MPa, the compressed air flushing cycle is 25 min, the flushing time is 4 min, and the gas volume per flush is 8 m³. 3 / m 2 cathode.

[0045] Oxidation chamber, anolyte current density 300 A / m2 The compressed air pressure in the aeration bypass is 0.3 MPa, and the flow rate is 1.0 m³ / s. 3 / (m 3 •h), the ultrasonic generator operates at a frequency of 38 kHz and has a power density of 1.75 kW / m². 3 .

[0046] The residence time of the electrochemical device is 5 h; the reflux ratio is 140%.

[0047] Under the above implementation conditions, the suspended solids, petroleum hydrocarbons, total hardness, ammonia nitrogen, and COD in the effluent from the device were 46 mg / L, 1.8 mg / L, 86 mg / L, 1.6 mg / L, and 235 mg / L, respectively.

[0048] Comparative Example 1:

[0049] Under the operating parameters of the above embodiments, only the gas flushing facility in the softening chamber is turned off, and only the programmable power supply does not perform the descaling procedure. The main pollutants in the effluent from the device are shown in Table 1 below.

[0050] Table 1. Main pollutants in the effluent from the closed-off equipment.

[0051]

[0052] Comparative Example 2:

[0053] Under the operating parameters of the above embodiments, when only the ultrasonic device is turned off in the oxidation chamber, only the particle packing is not filled and the aeration is not turned on, and when all are turned off, the main pollutants in the effluent from the device are...

[0054] 46 mg / L, 1.8 mg / L, 86 mg / L, 1.6 mg / L, 235 mg / L

[0055] .

Claims

1. A three-dimensional electrode electrochemical device with descaling function, characterized in that, The reactor includes an electrochemical reactor with an inlet and an outlet on each of its upper sides. The upper space is divided into a softening chamber and an oxidation chamber by a partition. The softening chamber contains multiple sets of cylindrical electrodes, which are electrically connected to an external programmable DC regulated power supply. The oxidation chamber contains a three-dimensional electrode set, which is also electrically connected to an external DC regulated power supply. A conical hopper is located at the bottom of the softening and oxidation chambers, with its bottom connected to a sludge discharge port. A gas flushing mechanism is located within the cylindrical electrode sets, and an aeration mechanism is located at the bottom of the three-dimensional electrode sets. Both the gas flushing and aeration mechanisms are connected to an external air compressor via pipelines. A spraying mechanism, comprising multiple rotating nozzles, is located at the top of the oxidation chamber and is connected to an external circulating water pump via a circulation pipeline. An ultrasonic transducer is integrated around the three-dimensional electrode sets and is connected to an external ultrasonic generator.

2. The three-dimensional electrode electrochemical device with descaling function according to claim 1, characterized in that, The cylindrical electrode assembly includes an inner cylindrical anode, an inner cylindrical anode terminal, an outer cylindrical cathode, and an outer cylindrical cathode terminal. The inner cylindrical anode terminal and the outer cylindrical cathode terminal are respectively connected to the positive and negative terminals of the programmable DC regulated power supply through insulated copper wires. The inner cylindrical anode and the outer cylindrical cathode are fixedly connected by a fixing member at the top.

3. The three-dimensional electrode electrochemical device with descaling function according to claim 2, characterized in that, The fixing component is a ring-shaped sleeve, including an inner ring sleeve and an outer ring sleeve connected to each other. The inner ring sleeve is fitted over the top circular edge of the inner cylindrical cathode, and the outer ring sleeve is fitted over the top circular edge of the outer cylindrical anode. The terminals of the inner cylindrical anode and the outer cylindrical cathode both protrude from the ring-shaped sleeve.

4. A three-dimensional electrode electrochemical device with descaling function according to claim 2 or 3, characterized in that, The gas flushing mechanism includes a flushing air pipe, which is vertically installed in the gap between the inner cylindrical anode and the outer cylindrical cathode. The flushing air pipe has evenly distributed air holes and is connected to the main air pipe through a flushing branch pipe. The main air pipe is connected to the air compressor, and the flushing branch pipe is equipped with a solenoid valve and an air flow meter.

5. The three-dimensional electrode electrochemical device with descaling function according to claim 4, characterized in that, The air holes are evenly distributed on the side of the flushing air pipe facing the outer cylindrical cathode.

6. The three-dimensional electrode electrochemical device with descaling function according to claim 5, characterized in that, The three-dimensional electrode assembly comprises multiple anode plates and cathode plates of equal size, spaced alternately. A perforated insulating basket is provided in the gap between adjacent anode and cathode plates, and the insulating basket is filled with particle filler. The top of each anode plate is connected to an anode terminal, and the top of each cathode plate is connected to a cathode terminal. The anode and cathode terminals are connected to the DC regulated power supply via copper busbars. The bottoms of the anode and cathode plates are fixed by slotted plates. The top of the insulating basket is connected to an externally mounted electric lifting device via a lifting plate.

7. The three-dimensional electrode electrochemical device with descaling function according to claim 6, characterized in that, The aeration mechanism includes a porous sieve plate, which is horizontally positioned at the bottom of the three-dimensional electrode assembly. It also includes an aeration branch pipe extending into the oxidation chamber, which is connected to the main air pipe. The aeration branch pipe is equipped with a pressure regulating valve and an air flow meter.

8. A three-dimensional electrode electrochemical device with descaling function according to claim 7, characterized in that, The inner cylindrical anode is made of Ti / RuO2-IrO2, Ti / RuO2-TiO2, or Ti / IrO2-Ta2O5; the outer cylindrical cathode is made of titanium mesh, stainless steel mesh, or nickel alloy mesh; the inner cylindrical anode and the outer cylindrical cathode are at the same height; the inner cylindrical anode has a diameter of 4.5-5.5 cm and a thickness of 3.5-4.5 mm; the outer cylindrical cathode has a diameter of 28-32 cm and a thickness of 1.5-2.5 mm; the outer cylindrical cathode is mesh-like with a mesh size of 0.5-1.5 mm.

9. A three-dimensional electrode electrochemical device with descaling function according to claim 8, characterized in that, The anode plate is a chlorine-evolving Ti / RuO2-IrO2 electrode, and the cathode plate is a Ti plate; the particle filler is granular activated carbon, which can be walnut shells, coconut shells, or anthracite; the pore size of the insulating basket is 1-3 mm; the diameter of the particle filler is 4-8 mm, and the particle filler filling rate is 40-70%; the aperture of the porous sieve plate is 2-5 mm, and the opening rate is 60-80%; the spray angle of the rotating nozzle is 50-150°, and the spacing between the rotating nozzles is 10-15 cm.

10. A three-dimensional electrode electrochemical device with descaling function according to claim 9, characterized in that, The outer diameter of the flushing air pipe is 16 mm, the distance between the air hole and the outer cylindrical cathode is 2.0-3.0 cm, and the diameter of the air hole is 2-4 mm; the diameter of the opening of the aeration branch pipe is 2-4 mm, and the opening interval is 1-3 cm.

Images