Electrochemical hardness removal device capable of rotating and automatically removing scale

Abstract

According to the electrochemical hardness removal device capable of rotating and automatically removing the scale, a cathode tube array structure serves as a cathode, the interval g between every two adjacent cathode tubes is set in a narrow size range, and the two adjacent cathode tubes rotate in the same direction, so that rotating and self-removing of the scale on the surfaces of the cathode tubes in the water body electrolytic hardness removal process is facilitated, and the water body hardness removal efficiency is improved. The device is characterized by comprising a cathode and an anode which are arranged in an electrolytic bath, the cathode adopts a cathode tube array structure, two adjacent cathode tubes in the cathode tube array rotate in the same direction, the diameter of each cathode tube in the cathode tube array is 10-300mm, and the interval between the two adjacent cathode tubes is 0.1-1mm; the outer surface of the tube body of each cathode tube is used for scale deposition of the hard water body to be removed, and the cathode tubes realize self-scale removal through rubbing of the scale deposition layers at the intervals.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, and in particular to an electrochemical hardening device capable of rotating and self-cleaning scale removal, which is beneficial for water conservation in industrial circulating water systems. Background Technology

[0002] Industrial circulating cooling water often experiences an increase in alkalinity and hardness after use. High hardness and alkalinity strongly promote scaling, requiring water replenishment to maintain certain hardness and alkalinity concentrations. To further improve water utilization, it's necessary to remove hardness or alkalinity from the water. Electrochemical hardness removal equipment can effectively remove hardness from water. Due to its small footprint, ease of operation, and good results, it has attracted widespread attention. Electrochemical hardness removal equipment has a cathode and an anode. After energizing, OH- is generated near the cathode. - , with Mg 2+ The reaction produces magnesium hydroxide, which reacts with HCO3 in water. - The reaction produces CO3 2- And then with Ca 2+ The reaction produces CaCO3; Cl2 or O2 is generated near the anode. Electrochemical hardening equipment causes scale-forming ions to pre-deposit into calcium carbonate or magnesium hydroxide from the water system, thereby reducing scale buildup on heat exchange equipment; at the same time, electrochemical hardening equipment also releases Cl2 to achieve sterilization and algae removal.

[0003] After electrochemical hardness removal equipment removes hardness, the amount of scale in the water decreases, which can further improve water utilization and save water. However, it is also observed that many electrochemical hardness removal devices have a low degree of automation, mainly because scale deposits on the cathode plate and requires regular cleaning. Some equipment requires manual cleaning, while others use scrapers, blades, or brushes to remove scale from the cathode plate. However, scrapers, blades, or brushes are prone to failure, increasing the frequency of replacement or maintenance. Summary of the Invention

[0004] To address the deficiencies or shortcomings of existing technologies, this invention provides an electrochemical descaling device capable of rotating and self-cleaning scale removal. By using a cathode tube array structure as the cathode and setting the interval g between two adjacent cathode tubes within a narrow range, and ensuring that both adjacent cathode tubes rotate in the same direction, it is beneficial to achieve rotating and self-cleaning scale removal on the surface of the cathode tubes during the electrolytic descaling process of water.

[0005] The technical solution of the present invention is as follows:

[0006] An electrochemical hard water removal device capable of self-cleaning by rotation is characterized by comprising a cathode and an anode arranged in an electrolytic cell. The cathode adopts a cathode tube array structure, in which adjacent cathode tubes rotate in the same direction. Each cathode tube in the cathode tube array has a diameter of 10-300 mm, and the interval between adjacent cathode tubes is 0.1-1 mm. The outer surface of each cathode tube is used for the deposition of scale in the hard water to be removed. The friction of the scale deposit layer at the interval enables the cathode tube to achieve self-cleaning of scale.

[0007] The anode is an anode plate, and the anode and cathode are arranged longitudinally and alternately in the electrolytic cell.

[0008] The top end of the cathode tube is connected to a fixed shaft, which has an upper gear for transmission and a top bearing for rotation. The bottom end of the cathode tube is connected to a support shaft, which has a lower gear for transmission and a bottom bearing for rotation. The top side of the cathode tube is connected to a power supply plate.

[0009] Intermediate axles are provided between the two upper gears and the two lower gears of adjacent cathode tubes to enable the two adjacent cathode tubes to rotate in the same direction.

[0010] An electrode support frame is provided at the bottom of the electrolytic cell, and an electrode fixing frame is provided at the top of the electrolytic cell. A cathode support frame is provided on the electrode support frame, and the cathode support frame is connected to the bottom bearing. A cathode fixing frame is provided on the electrode fixing frame, and the cathode fixing frame is connected to the top bearing.

[0011] The electrolytic cell has an outwardly extending inlet pipe on its left side wall and an outwardly extending outlet pipe on its right side wall. Both the inlet and outlet pipes are equipped with electrically controlled valves. The bottom of the electrolytic cell has a drainage and slag discharge outlet pipe, which is also equipped with an electrically controlled valve. The top surface of the electrolytic cell has an exhaust outlet pipe, which is also equipped with an electrically controlled valve. An electrical control cabinet is located around the periphery of the electrolytic cell.

[0012] A rotating motor is installed above the electrolytic cell. One or more shafts are selected from the supporting shaft and / or the fixed shaft as drive shafts. A rotating rod is installed on the drive shaft and connected to the rotating motor.

[0013] The anode and cathode are spaced 50-500mm apart, and the electrode voltage is between 1.5-20V.

[0014] The technical effects of this invention are as follows: This invention provides a rotating, self-cleaning electrochemical hardening device. When the cathode tube rotates, the scale layer moves with the cathode tube and is sheared off at the tangential position of adjacent cathode tube surfaces. The scale is moved to the bottom or into the water, thus cleaning the cathode tube surface and allowing for better electrolytic reactions. When the cathode tube rotates continuously, the hydroxide ions enriched on the cathode tube surface are also disturbed by hydraulic forces, causing them to leave the cathode tube more quickly and distribute more evenly in the water to react with Mg. 2+ HCO3 - , Ca 2+ The plasma reaction generates scale such as magnesium hydroxide and calcium carbonate, accelerating scale formation and making the scale looser and easier to remove. Hardness and alkalinity are the main sources of scale in water. This device can remove hardness online through electrochemical methods, reducing the concentration of hardness ions in circulating cooling water. This reduces scale buildup on heat exchange equipment and improves water utilization, thereby continuously increasing the water concentration ratio. The cathode of this device is a three-dimensional cathode composed of a row of cathode tubes, integrating water hardness removal, electrode scale absorption, and self-cleaning functions. It can achieve continuous water hardness removal, constantly rotating to maintain cathode cleanliness, reducing the burden of manual scale removal and eliminating the need to change electrodes. This simplifies the composition of cathode and anode materials and the control system. No other scale removal tools such as scrapers, blades, or brushes are needed during the descaling process. The anode of this device generates Cl2 and other substances during electrolysis, which have a strong bactericidal effect, killing bacteria and algae in the water and effectively controlling the growth of microbial slime in the circulating water, providing a good operating environment for the circulating water system. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the core structure of an electrochemical hardening device capable of rotating and self-cleaning scale removal, which implements the present invention.

[0016] Figure 2 This is a schematic diagram of the three-dimensional structure of the electrode of an electrochemical hardening device capable of rotating and self-cleaning scale removal according to the present invention.

[0017] Figure 3 yes Figure 1 A schematic diagram of a single cathode tube structure.

[0018] Figure 4 This is a schematic diagram of the structure of an electrochemical hardening device capable of rotating and self-cleaning scale removal, which implements the present invention.

[0019] Figure 5 yes Figure 4 A top-down view of the structure.

[0020] Figure 6 This is a schematic diagram of the water treatment principle of a circulating cooling water system using an electrochemical hardening device capable of rotating and self-cleaning scale removal according to the present invention. Figure 6 The system includes equipment such as cooling towers, cold water tanks, filters, hardening removal devices, booster pumps, and heat exchangers. Cooling water from the cooling towers and clean water from the filters both enter the cold water tank. The booster pump draws water from the cold water tank and sends it to the heat exchanger and hardening removal device. The heat exchanger is connected to the cooling tower. The hardening removal device sends the water that has undergone hardening removal treatment into the filter. The filter backwash water and the sludge discharge water from the hardening removal device both enter the wastewater treatment plant.

[0021] Figure 7 This is a schematic diagram of the combined structure of the fixed shaft and the intermediate wheel shaft.

[0022] Figure 8 This is a schematic diagram of the combined structure of the support shaft and the intermediate wheel shaft.

[0023] The reference numerals in the attached diagram are listed below: 1-Cathode; 2-Cathode tube; 5-Bearing; 6-Support shaft; 7-Fixed shaft; 8-Rotating motor; 9-Rotating rod; 10-Power supply board; 11-Electrical control cabinet; 12-Anode or anode plate; 13-Electrode support frame; 14-Electrode fixing frame; 15-Electrically controlled valve; 16-Drainage and slag discharge port; 17-Water inlet; 18-Water outlet; 19-Exhaust port; 20-Electrode group; 21-Intermediate wheel shaft; 22-Direction of rotation; g-Spacing between two adjacent cathode tubes (g = 0.1~1mm). Detailed Implementation

[0024] The following is in conjunction with the attached diagram ( Figures 1-8 The invention will be described in the following sections and examples.

[0025] Figure 1 This is a schematic diagram of the core structure of an electrochemical hardening device capable of rotating and self-cleaning scale removal, which implements the present invention. Figure 2 This is a schematic diagram of the three-dimensional structure of the electrode of an electrochemical hardening device capable of rotating and self-cleaning scale removal according to the present invention. Figure 3 yes Figure 1 A schematic diagram of a single cathode tube structure. Figure 4 This is a schematic diagram of the structure of an electrochemical hardening device capable of rotating and self-cleaning scale removal, which implements the present invention. Figure 5 yes Figure 4 A top-down view of the structure. Figure 6 This is a schematic diagram of the water treatment principle of a circulating cooling water system using an electrochemical hardening device capable of rotating and self-cleaning scale removal according to the present invention. Figure 7 This is a schematic diagram of the combined structure of the fixed shaft and the intermediate wheel shaft.

[0026] Figure 8 This is a schematic diagram of the combined structure of the support shaft and the intermediate wheel axle. (Reference) Figures 1 to 8As shown, an electrochemical hard water removal device capable of rotating and self-cleaning scale removal includes a cathode 1 and an anode 12 arranged in an electrolytic cell. The cathode 1 adopts a cathode tube array structure, in which adjacent cathode tubes rotate in the same direction. Each cathode tube 2 in the cathode tube array has a diameter of 10-300 mm, and the interval between adjacent cathode tubes is 0.1-1 mm. The outer surface of each cathode tube 2 is used for the deposition of scale from the hard water to be removed. The rubbing of the scale deposit layer at the intervals enables the cathode tube 2 to achieve self-cleaning scale removal. Figure 1 The cathode tubes rotate in the right direction (22), but at the interval g between two adjacent cathode tubes, the two surfaces undergo rubbing or shearing motion.

[0027] The anode 12 is an anode plate, and the anode 12 and cathode 1 are arranged longitudinally and alternately in the electrolytic cell. The top end of the cathode tube 2 is connected to a fixed shaft 7, which has an upper gear for transmission and a top bearing (i.e., bearing 5) for rotation. The bottom end of the cathode tube 2 is connected to a support shaft 6, which has a lower gear for transmission and a bottom bearing (i.e., bearing 5) for rotation. The top side of the cathode tube 2 is connected to a power supply plate 10. Intermediate axles 21 are provided between adjacent upper gears and between adjacent lower gears of two adjacent cathode tubes to ensure that adjacent cathode tubes rotate in the same direction.

[0028] An electrode support frame 13 is provided at the bottom of the electrolytic cell, and an electrode fixing frame 14 is provided at the top of the electrolytic cell. A cathode support frame is provided on the electrode support frame 13, and the cathode support frame is connected to the bottom bearing (i.e., bearing 5). A cathode fixing frame is provided on the electrode fixing frame 14, and the cathode fixing frame is connected to the top bearing (i.e., bearing 5).

[0029] The electrolytic cell has an outwardly extending inlet pipe 17 on its left side wall and an outwardly extending outlet pipe 18 on its right side wall. Both the inlet pipe 17 and the outlet pipe 18 are equipped with electrically controlled valves 15. The bottom of the electrolytic cell has a drainage and slag discharge port 16, on which an electrically controlled valve 15 is installed. The top surface of the electrolytic cell has an exhaust port 19, on which an electrically controlled valve 15 is installed. An electrical control cabinet 11 is located around the periphery of the electrolytic cell. A rotating motor 8 is installed above the electrolytic cell. One or more drive shafts are selected from the supporting shaft 6 and / or the fixed shaft 7. A rotating rod 9 is mounted on the drive shaft and connected to the rotating motor 8. The anode and cathode are spaced 50-500mm apart, and the electrode voltage is between 1.5-20V.

[0030] This invention provides an electrochemical hardening device capable of rotating and self-cleaning scale removal. The device is equipped with a rotating electrode capable of self-cleaning scale removal. The device is also designed with an electrochemical treatment area, a sewage and drainage area, a box with an electrode support, a rotating motor, a power control system, and connected inlet, outlet, and drainage and slag discharge outlet.

[0031] Scale accumulates on the cathode surface, typically growing to a thickness of several millimeters to tens of millimeters. When the cathode tubes rotate in the same direction, the scale moves along with the cathode tube surface. The distance between adjacent cathode tubes is only 0.1 to 1.0 millimeters, so the scale layer cannot pass through the gap between adjacent cathode tubes. Moreover, at the gap between adjacent cathode tubes, the cathode tube surfaces move in opposite directions, and the scale is sheared off the cathode tube surface at the tangent position and falls off. The scale moves to the bottom or into the water, cleaning the cathode tube surface and allowing for better electrolysis.

[0032] When the cathode tube rotates faster, the water flow speed increases at the gap between adjacent cathode tubes. The disturbed water flow also has a certain scouring effect on the scale layer, thus making the scale layer on the cathode tube surface more thoroughly removed.

[0033] As the cathode tube rotates continuously, the hydroxide ions enriched on its surface are agitated by hydraulic forces, causing them to leave the tube more quickly and distribute more evenly in the water to react with Mg. 2+ HCO3 - , Ca 2+ The plasma reaction generates scale such as magnesium hydroxide and calcium carbonate, which makes the scale formation faster, looser, and easier to remove.

[0034] In the electrode assembly of the electrochemical hardening device, an electrolytic reaction occurs at the cathode to generate hydroxide ions. Under the influence of the electric field, these hydroxide ions move towards the anode, pass through the scale layer, and react with Mg in the water. 2+ HCO3 - , Ca 2+ Plasma bonding reactions produce scale such as magnesium hydroxide and calcium carbonate deposited on the cathode surface. Thicker scale layers can also cause increased resistance and decreased current, indicating an impending descaling operation. Therefore, circulating cooling water systems can utilize the electrochemical hardening device of this invention, which is capable of rotating self-cleaning and descaling (e.g., [device name missing]). Figure 6 (As shown).

[0035] Example 1

[0036] A circulating cooling water system uses high-hardness, high-alkalinity water as makeup water. Due to the high hardness and alkalinity of the cooling water, the system has a strong tendency to scale, affecting normal production and water reuse rate. This device is installed in the circulating water system. The system's water usage process is as follows: a portion of the effluent from the cold water tank is pumped through a booster pump into the heat exchanger → cooling tower → cold water tank, and returns to the cold water tank after circulation. Another portion of the effluent from the cold water tank is pumped through a booster pump into an electrochemical hardening removal device → filter → cold water tank. The water with hardness removed by the hardening removal device is then filtered, and the filtered water returns to the cold water tank for reuse in the circulating cooling water system. The drainage and slag discharge water from the hardening removal device and the backwash water from the filter enter the wastewater treatment system.

[0037] When circulating water passes through the electrochemical device, the water undergoes the following reaction in the electrode region under the influence of the electric field.

[0038] Cathode: 2H₂O + 2e⁻ - →2OH - +H2↑

[0039] 2OH - +Mg 2+ →Mg(OH)2↓

[0040] OH - +HCO3 - →CO3 2- +H2O

[0041] CO3 2- +Ca 2+ →CaCO3↓

[0042] Anode: 2Cl - -2e - →Cl2

[0043] 2H2O-4e - →4H + +O2

[0044] 2H₂O + O₂ → 2H₂O₂

[0045] Near the cathode, hydroxide ions are electrolyzed. These ions react with magnesium ions in the water to form magnesium hydroxide, which is adsorbed onto the cathode tube. Hydroxide ions react with bicarbonate ions to form carbonate ions, and carbonate ions react with calcium ions in the water to form calcium carbonate, which is also adsorbed onto the cathode tube. The magnesium hydroxide and calcium carbonate continuously deposit and accumulate on the cathode tube, forming a thick scale layer. When scale removal is needed, a rotating motor is started. The motor rotates a rotating rod, which in turn rotates the fixed and supporting shafts that serve as the drive shaft. Gears on the fixed and supporting shafts drive the intermediate wheel shaft to rotate, which in turn drives the adjacent fixed and supporting shafts, which also have gears, and the cathode tubes to rotate. This causes a row of cathode tubes to rotate simultaneously in the same direction. The scale adsorbed on the cathode tubes rotates with the cathode tubes, but it cannot pass through the narrow gaps between the cathode tubes during rotation, thus being detached from the cathode tubes and sliding to the bottom or into the water. Furthermore, the rotation of the cathode tubes disturbs the water around them, further cleaning the cathode tubes and achieving the purpose of removing scale from the cathodes.

[0046] During operation, the drain and slag discharge valves are opened periodically, allowing scale to leave the system through the drain and slag discharge ports and enter the sludge treatment system. When set to online continuous hardness removal mode, some scale will also leave the hardness removal device with the effluent, passing through a filter to remove residual scale. Clean, low-hardness water then re-enters the circulating water system. This circulating water system uses high-alkalinity, high-hardness water as makeup water. With the addition of scale inhibitors and dispersants, the circulating water concentration ratio reaches a limit of three times, and further improvements in water utilization are not possible. After the electrochemical hardness removal device is activated, hardness ions in the water undergo an electrochemical reaction to form scale, which is then detached from the water system. This reduces the number of hardness ions in the water, decreases the tendency to scale, and improves water reuse. The concentration ratio reaches more than ten times, and no scaling occurs in the heat exchange equipment, allowing the circulating water to be reused. The electrochemical device electrolyzes Cl2 and other substances with strong bactericidal and algaecidal properties. When the electrochemical device is activated, the equipment is clean, free of scale and sludge.

[0047] This invention relates to an electrochemical hardening device for use in circulating cooling water systems. It can continuously remove hardness from circulating cooling water, thereby reducing scale buildup in heat exchange equipment and improving water reuse rates. The invention employs an integrated, fully automatic descaling design; when scale removal is required, it can rotate to self-clean scale adhering to the cathode, eliminating the need for manual removal and reducing labor intensity.

[0048] This invention discloses a rotary self-cleaning electrochemical hardening device, comprising a cathode 1 and an anode 12 for electrochemical hardening. The cathode 1 consists of 60 stainless steel cathode tubes 2, arranged in three rows. The cathode tubes 2 are straight, of equal length and diameter (900 mm), and have a smooth, hard surface. They are arranged in a rectangular planar shape, with a spacing of 0.3 mm between each pair of adjacent cathode tubes 2. Twenty adjacent cathode tubes 2 are arranged to form a three-dimensional cathode. The anode 12 is a titanium-based ruthenium-iridium coated anode plate. The cross-sectional area of ​​the anode 12 is approximately the same as that of the cathode 1, forming an electrode with a cross-sectional area of ​​0.9 m². 2 The three-dimensional electrode assembly 20. The cathode 1 and anode 12 are installed in parallel and symmetrically, with a spacing of 200mm between them. The electrode voltage is between 1.5-20V. The gap between the cathode 1 and anode 12 is a water flow channel, and high-hardness water can flow through the gap between the cathode 1 and anode 12.

[0049] A cathode support frame and a cathode fixing frame are provided to fix the position of the cathode tube 2. The cathode support frame and cathode fixing frame are provided with concave shaft grooves for installing bearings 5, for installing the support shaft 6 and fixing shaft 7 with bearings 5 ​​and the intermediate wheel shaft 21. The support shaft 6, fixing shaft 7 and intermediate wheel shaft 21 are arranged on the cathode support frame and cathode fixing frame so that the support shaft 6 and fixing shaft 7 are horizontally distributed and can rotate freely in the same direction. The number of support shaft 6 and fixing shaft 7 is the same as the number of cathode tubes 2. The lower end of the cathode tube 2 is connected to the support shaft 6 and the upper end of the cathode tube is connected to the fixing shaft 7. After the cathode tube 2 is fixed, there is a gap between each adjacent cathode tube 2, and the gap is uniform so that they do not contact each other. The supporting shaft 6, the fixed shaft 7, and the intermediate wheel shaft 21 are gear shafts with gears. The gears of adjacent supporting shafts 6, fixed shafts 7, and intermediate wheel shafts 21 mesh with each other. As long as one supporting shaft 6 or fixed shaft 7 rotates, the adjacent supporting shafts 6 and fixed shafts 7, together with the cathode tubes 2, will rotate together, so that a row of cathode tubes 2 will rotate together.

[0050] A rotating motor 8 is located at the top, above the cathode. One or more of the supporting shaft 6 and the fixed shaft 7 are configured as drive shafts, with a rotating rod 9 mounted on the drive shaft. The rotating rod 9 is connected to the rotating motor 8. When the rotating motor 8 starts, it rotates the rotating rod 9, which in turn rotates the geared drive shaft. Under the action of the gears, the geared drive shaft can drive the geared fixed shaft 7, the supporting shaft 6, the intermediate wheel shaft 21, and the cathode tube 2 to rotate, thereby causing a row of cathode tubes 2 adjacent to this cathode tube 2 to rotate simultaneously in the same direction.

[0051] The cathode power supply uses a power supply board 10, which is made of flexible steel plate. One end of the power supply board 10 is installed on the cathode fixing frame or cathode support frame and is isolated from the cathode fixing frame or cathode support frame by insulating material to prevent electrical contact. The other end of the power supply board 10 is connected to each cathode tube 2 in a row to energize it. The power supply board 10 is connected to the cathode output of the electrical control cabinet 11 through wires.

[0052] The electrochemical treatment zone is located in the upper part of the electrochemical hardening device, with three sets of cathodes 1 and anodes 12 serving as electrode working components. The device contains an electrode support frame 13 and an electrode fixing frame 14. The electrode support frame 13 is horizontally installed in the lower part of the electrochemical treatment zone, and the electrode fixing frame 14 is installed in the upper part of the electrochemical treatment zone. The anode 12 and cathode 1 are located in the middle area between the electrode support frame 13 and the electrode fixing frame 14.

[0053] The upper edge of the anode electrode support frame and the lower edge of the fixing frame are provided with fixing plates with holes for fixing the anode plate. During installation, there are insulating pads between the anode and the support frame, and between the fixing frame and the fixing plate. The anode is fixed with fixing bolts made of electrically insulating material. The anode 12 is connected to the anode output of the control cabinet 11 by a wire. The anode 12 is an electrode plate with the same cross-sectional area as the cathode 1 and is planar.

[0054] The lower part of the device is a drainage and slag discharge area, and the lower part of the device has three drainage and slag discharge ports 16. An electrically controlled valve 15 is installed on the drainage and slag discharge pipe, which collects the slag and water discharged from each drainage and slag discharge port 16 and transports it to a wastewater treatment tank. Supports are provided around the lower part of the device to accommodate the drainage and slag discharge area and pipelines. The device has an inlet 17 and an outlet 18, which are controlled by electrically controlled valves. The device also has an exhaust port 19 to discharge gases generated during electrolysis.

[0055] An electrical control cabinet 11 is provided as a power control system. The electrical control cabinet 11 provides electrolytic power to the anode 12 and cathode 1 in this device. The electrical control cabinet 11 can control the start and stop time of the rotating motor 8. The electrical control cabinet 11 can control the operation and start / stop of the inlet and outlet water pipe electrical control valve 15 and the drainage and slag discharge pipe electrical control valve 15, so that they can operate automatically according to the design requirements.

[0056] Water is electrolyzed at cathode 1 under the influence of an electric field to produce hydroxide ions. The hydroxide ions react with Mg in the water. 2+ HCO3 - , Ca 2+The plasma reaction generates scale such as calcium carbonate and magnesium hydroxide, which adsorb onto the cathode tube 2, typically reaching a thickness of several millimeters or tens of millimeters. The scale is relatively loose. When scale removal is required, the rotating motor 8 is started. The rotating motor 8 rotates the rotating rod 9, which in turn rotates the fixed shaft 7 and the supporting shaft 6, which serve as the drive shaft. The gears on the fixed shaft 7, the supporting shaft 6, and the intermediate wheel shaft 21 drive the adjacent fixed shaft 7 and the supporting shaft 6, which also have gears, to rotate, thereby causing a row of cathode tubes 2 to rotate simultaneously in the same direction. The scale adsorbed on the cathode tubes 2 rotates with the cathode tubes 2, but it cannot pass through the narrow gaps between the cathode tubes 2 as it rotates, thus being detached from the cathode tubes 2 and sliding to the bottom or into the water. Moreover, the water around the cathode tubes 2 is disturbed when the cathode tubes 2 rotates, which further cleans the cathode tubes 2, achieving the purpose of removing scale from the cathodes.

[0057] During operation, the device can be cleaned intermittently or continuously. During intermittent cleaning, the scale is removed from the cathode tube 2 and leaves the system through the drain and slag discharge port. During continuous cleaning, part of the scale is removed and leaves the system through the drain and slag discharge port, while some scale leaves the electrolysis equipment with the effluent. It then passes through the filter installed after the effluent pipe to filter the scale from the water, ensuring that the scale is completely removed from the water body. The water with reduced hardness then re-enters the circulating water system.

[0058] An electrochemical hardening device capable of rotating and self-cleaning scale removal is disclosed, comprising cathodes and anodes for electrochemical hardening removal. The cathodes are metal cathode tubes (columns or mesh tubes), with several tubes of equal diameter and length, straight, with hard and smooth surfaces, arranged neatly in rows, either planar or curved. Several adjacent cathode tubes are arranged to form a three-dimensional cathode. The cross-sectional areas of the corresponding cathodes and anodes in each row are approximately the same. The cathodes and anodes are spaced apart, with the gap between them serving as a water flow channel through which hard water flows.

[0059] The anode can be an electrode plate or an electrode mesh, and the anode can be planar or curved depending on the diameter of the cathode tube.

[0060] The design of the main drainage and slag discharge pipe can collect the slag and water from each drainage and slag discharge pipe and transport it to the wastewater tank. The lower part of the device is supported around its perimeter, and space is provided for the drainage and slag discharge area and the drainage and slag discharge pipelines.

[0061] The cathode is a cathode tube suitable for electrochemical water treatment, including but not limited to stainless steel, titanium, or other metal tubes. The cathode tube diameter is 10-300 mm, and the length is 100-1000 mm. Each adjacent cathode tube is spaced 0.1-1 mm apart. The fixed shaft, support shaft, and intermediate wheel shaft are made of non-conductive insulating materials such as plastic or ceramic. Several adjacent cathode tubes form a three-dimensional electrode, connected to a rotating motor. Several groups can be arranged as needed to increase the processing capacity.

[0062] The anode is suitable for electrochemical water treatment, including but not limited to composite electrodes made of graphite, lead oxide, or titanium matrix loaded with other rare metals or oxides. The anode and cathode are spaced 50-500 mm apart, and the electrode voltage is between 1.5-20V.

[0063] Contents not described in detail in this specification are prior art known to those skilled in the art. It is hereby indicated that the above description is intended to help those skilled in the art understand this invention, but does not limit the scope of protection of this invention. Any equivalent substitutions, modifications, improvements, and / or simplifications of the above descriptions that do not depart from the essential content of this invention fall within the scope of protection of this invention.

Claims

1. An electrochemical hardening device capable of rotating and self-cleaning scale removal, characterized in that, It includes a cathode and an anode arranged in an electrolytic cell. The cathode adopts a cathode tube array structure. Two adjacent cathode tubes in the cathode tube array rotate in the same direction. The diameter of each cathode tube in the cathode tube array is 10 to 300 mm. The interval between two adjacent cathode tubes is 0.1 to 1 mm. The outer surface of each cathode tube is used for the deposition of scale from the hard water to be removed. The friction of the scale deposit layer at the interval enables the cathode tube to achieve self-decalcification.

2. The electrochemical hardening device capable of rotating and self-cleaning scale removal according to claim 1, characterized in that, The anode is an anode plate, and the anode and cathode are arranged longitudinally and alternately in the electrolytic cell.

3. The electrochemical hardening device capable of rotating and self-cleaning scale removal according to claim 1, characterized in that, The top end of the cathode tube is connected to a fixed shaft, which has an upper gear for transmission and a top bearing for rotation. The bottom end of the cathode tube is connected to a support shaft, which has a lower gear for transmission and a bottom bearing for rotation. The top side of the cathode tube is connected to a power supply plate.

4. The electrochemical hardening device capable of rotating and self-cleaning scale removal according to claim 3, characterized in that, Intermediate axles are provided between the two upper gears and the two lower gears of adjacent cathode tubes to enable the two adjacent cathode tubes to rotate in the same direction.

5. The electrochemical hardening device capable of rotating self-cleaning scale removal according to claim 3, characterized in that, An electrode support frame is provided at the bottom of the electrolytic cell, and an electrode fixing frame is provided at the top of the electrolytic cell. A cathode support frame is provided on the electrode support frame, and the cathode support frame is connected to the bottom bearing. A cathode fixing frame is provided on the electrode fixing frame, and the cathode fixing frame is connected to the top bearing.

6. The electrochemical hardening device capable of rotating and self-cleaning scale removal according to claim 1, characterized in that, The electrolytic cell has an outwardly extending inlet pipe on its left side wall and an outwardly extending outlet pipe on its right side wall. Both the inlet and outlet pipes are equipped with electrically controlled valves. The bottom of the electrolytic cell has a drainage and slag discharge outlet pipe, which is also equipped with an electrically controlled valve. The top surface of the electrolytic cell has an exhaust outlet pipe, which is also equipped with an electrically controlled valve. An electrical control cabinet is located around the periphery of the electrolytic cell.

7. The electrochemical hardening device capable of rotating and self-cleaning scale removal according to claim 3, characterized in that, A rotating motor is installed above the electrolytic cell. One or more shafts are selected from the supporting shaft and / or the fixed shaft as drive shafts. A rotating rod is installed on the drive shaft and connected to the rotating motor.

8. The electrochemical hardening device capable of rotating and self-cleaning scale removal according to claim 1, characterized in that, The anode and cathode are spaced 50-500mm apart, and the electrode voltage is between 1.5-20V.

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