Electrochemical water softening system with self-cleaning function

Abstract

The utility model discloses an electrochemical hard removal system with self -cleaning function, including electrochemical hard removal device, magnetic separation system, cyclone centrifuge, electric flocculation system, material recycling system, electrochemical hard removal device, magnetic separation system, cyclone centrifuge, electric flocculation system are connected in proper order, and electrochemical hard removal device and magnetic separation system all are connected with material recycling system, and electric flocculation system is connected with water outlet pipeline, electrochemical hard removal device includes electrolytic cell, and electrolytic cell is connected with slurry supply system, and electrolytic cell is provided with water inlet pipe and water outlet pipe, and water inlet pipe is connected with CO2 intelligent supplementary system, the utility model discloses adopting hollow porous cathode plate design, and the surface micropore aperture increases gradually from top to bottom, and is combined with the supply of induced crystallization slurry, and effectively realizes the self -cleaning function of cathode surface, and this design overcomes the problem that the cathode surface is difficult to remove in traditional electrochemical hard removal method, and remarkably prolongs the service life of cathode plate.

Description

Technical Field

[0001] This utility model relates to the field of electrochemical water treatment technology, specifically to an electrochemical hardening removal system with self-cleaning function. Background Technology

[0002] Electrochemical hardness removal technology, as an advanced technology for dealing with high-hardness wastewater in the industrial field, is widely favored for its high efficiency, environmental friendliness, and ease of operation. However, a challenge facing the long-term application of this technology is the easy accumulation of scale layers formed by hardness ion precipitation, such as calcium carbonate and magnesium hydroxide, on the cathode surface. These scale layers hinder ion transport and reactions on the electrode surface, thereby weakening electrolysis efficiency, increasing energy consumption, and requiring regular manual cleaning, which undoubtedly interrupts the continuous operation of the equipment. Therefore, developing easily maintainable electrodes has become an urgent problem to be solved in this field.

[0003] Currently, strategies for dealing with cathode scaling mainly include mechanical removal, acid washing, electrode polarity reversal, and optimized electrode structure design. However, each of these methods has its limitations. For example, mechanical removal components require frequent maintenance and are prone to damaging the electrode surface; polarity reversal can remove scale but is inefficient; acid washing may corrode the electrode material; and the manufacturing process of special electrodes is complex and lacks durability, while anti-scaling coatings are expensive.

[0004] Chinese patent CN113023832A discloses an innovative rotary electrochemical continuous hardening device. This device uses scrapers mounted on both sides of the cathode to scrape away surface scale through the cathode's rotation. The scale then falls into a collection tank via a collection chute. However, this method essentially falls into the category of traditional mechanical cleaning. It has many mechanical parts, leading to increased resistance, and half of the cathode is exposed to air, resulting in low utilization and risks of component failure and energy loss.

[0005] Chinese patent CN112268483A discloses an electrochemical hardening removal device and method based on vibration enhancement and polarity reversal self-cleaning. This method combines a dual mechanism of "polarity reversal + vibration" for scale removal. During the hardening removal process, electrolysis is periodically paused and the influent flow rate is reduced, while only the vibration device is activated to remove loose scale from the electrode walls. However, this method still relies on conventional polarity reversal technology combined with vibration enhancement, which to some extent affects the hardening removal efficiency.

[0006] Chinese patent CN117886456A discloses an electrochemical hardening removal method that focuses on the innovation of cathode structure, employing a pleated cathode design to treat wastewater. This design effectively slows down the scaling rate on the electrode surface and reduces energy consumption. However, after long-term use, the pleated cathode structure becomes relatively difficult to clean.

[0007] In summary, although various strategies have been attempted to address the problem of cathode scaling, developing an electrode solution that can effectively prevent scaling, is easy to clean, and is cost-effective remains a key research focus in this field. Utility Model Content

[0008] This invention provides an electrochemical hardening system with self-cleaning function to solve the problems existing in the background art.

[0009] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: An electrochemical hardening removal system with self-cleaning function includes an electrochemical hardening removal device, a magnetic separation system, a cyclone centrifuge, an electrocoagulation system, and a material recovery system. The electrochemical hardening removal device, the magnetic separation system, the cyclone centrifuge, and the electrocoagulation system are connected in sequence. The electrochemical hardening removal device and the magnetic separation system are both connected to the material recovery system. The electrocoagulation system is connected to an outlet pipe. The electrochemical hardening device includes an electrolytic cell connected to a slurry supply system. The electrolytic cell is equipped with an inlet pipe and an outlet pipe, and the inlet pipe is connected to a CO2 intelligent replenishment system.

[0010] Preferably, the electrolytic cell further includes an anode plate, a cathode plate, and an electrode power supply. The anode plate and cathode plate are respectively connected to the positive and negative terminals of the power supply. The cathode plate is connected to the slurry supply system via a pipeline. A slag discharge port is provided at the bottom of the electrolytic cell. The slag discharge port is connected to the material recovery system via a pipeline. A water outlet pipe and a water inlet pipe are respectively connected to the upper and lower sides of one side of the electrolytic cell. The water outlet pipe is connected to the magnetic separation system.

[0011] Preferably, the cathode plate is a hollow porous cathode plate, which is hollow inside and has micropores evenly distributed on its surface, with the micropore diameter increasing from top to bottom.

[0012] Preferably, the pore size of the micropores is 0.1 mm to 1 mm.

[0013] Preferably, the slurry supply system includes a storage silo and a constant pressure pump.

[0014] Preferably, the electrochemical hardening device is also connected to an intelligent pressure control system, which includes a control cabinet I and an online hardness monitor. The constant pressure pump is installed on the pipeline connecting the slurry supply system and the cathode plate, and the online hardness monitor is installed on the water inlet pipe and transmits signals with the control cabinet I.

[0015] Preferably, the CO2 intelligent replenishment system includes a control cabinet II and an online pH monitor. The online pH monitor is installed inside the electrolytic cell and is electrically connected to the control cabinet II. The control cabinet II is connected to the water inlet pipe.

[0016] Preferably, the cathode plate is a copper-nickel alloy electrode or a stainless steel electrode, and the anode plate is a titanium-based coated anode plate.

[0017] Preferably, the storage silo is filled with an induced crystallization slurry, which is formed by mechanically mixing deionized water, water-soluble binder, thickener, Fe3O4 powder, activated carbon powder, and induced crystallization material powder.

[0018] Preferably, the slag discharge port is cone-shaped.

[0019] This utility model has the following beneficial effects: (1) The system adopts a hollow porous cathode plate design, with the micropore diameter on its surface increasing from top to bottom. Combined with the supply of induced crystallization slurry, the self-cleaning function of the cathode surface is effectively realized. This design overcomes the problem of difficult removal of scale on the cathode surface in traditional electrochemical hardening methods and significantly extends the service life of the cathode.

[0020] (2) Through the synergistic effect of optimized cathode structure design and slurry supply system, the scaling rate on cathode surface is significantly reduced; this not only reduces the frequency of cleaning and maintenance, but also effectively reduces energy consumption in the electrochemical hardening process and improves the overall efficiency of the system.

[0021] (3) The system integrates an intelligent pressure control system and an intelligent CO2 replenishment system. The intelligent pressure control system automatically adjusts the slurry supply pressure based on the real-time feedback from the online hardness monitor to ensure the stability of the hardening effect. At the same time, the intelligent CO2 replenishment system accurately controls the amount of CO2 replenishment based on the real-time monitoring of the pH value in the electrolytic cell, which further improves the hardening efficiency and reduces material waste.

[0022] (4) The electrochemical hardening device is connected in sequence with the magnetic separation system, the cyclone centrifuge and the electrocoagulation system to form a complete solid-liquid separation and material recovery process. The slag discharge port at the bottom of the electrolytic cell is designed in a cone shape, which is conducive to the smooth discharge of slag. Through the synergistic effect of magnetic separation, cyclone centrifuge and electrocoagulation technology, the efficient separation of solid and liquid and the effective recovery of materials are achieved, which not only improves environmental benefits, but also brings significant economic benefits. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the electrochemical hardening device of this utility model; Figure 2This is a schematic diagram of the electrochemical hardening system with self-cleaning function of this utility model; Figure 3 This is a schematic diagram of the cathode plate structure of this utility model.

[0024] In the diagram, 1-Electrochemical hardening removal device, 2-Magnetic separation system, 3-Cyclone centrifuge, 4-Electrocoagulation system, 5-Material recovery system, 6-Electrolytic cell, 7-Inlet pipe, 8-Outlet pipe, 9-Induced crystallization slurry, 10-Outlet pipe, 11-Intelligent CO2 replenishment system, 12-Anode plate, 13-Cathode plate, 14-Electrode power supply, 15-Slag discharge port, 16-Micropores, 17-Storage silo, 18-Constant pressure pump, 19-Intelligent pressure control system, 20-Control cabinet I, 21-Online hardness monitor, 22-Online pH monitor, 23-Control cabinet II, 24-Slurry supply system. Detailed Implementation

[0025] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0026] An electrochemical hardening system with self-cleaning function, such as the attached Figure 1-3 As shown, the system includes an electrochemical hardening device 1, a magnetic separation system 2, a cyclone centrifuge 3, an electrocoagulation system 4, and a material recovery system 5. These components are connected sequentially. The electrochemical hardening device 1 and the magnetic separation system 2 are both connected to the material recovery system 5. The electrocoagulation system 4 is connected to an outlet pipe 10. The electrochemical hardening device 1 includes an electrolytic cell 6, which includes an anode plate 12, a cathode plate 13, and an electrode power supply 14. The cathode plate 13 is a copper-nickel alloy electrode plate or a stainless steel electrode plate, and the anode plate 12 is a titanium-based coated anode plate. The anode plate 12 and the cathode plate 13 are respectively connected to the positive and negative terminals of the power supply. When current is applied, water is electrolyzed on the cathode surface and the surface of the induced crystallization slurry 9. Under the action of the induced crystallization slurry 9 (hereinafter referred to as the slurry), Ca... 2+ / Mg 2+Scaling occurs on the raised surface; the cathode plate 13 is connected to the slurry supply system 24 via a pipeline. The cathode plate 13 is a hollow porous cathode plate, which is hollow inside and has micropores 16 evenly distributed on its surface. The diameter of the micropores 16 is 0.1mm~1mm, and the diameter of the micropores 16 increases from top to bottom. This arrangement allows the slurry inside the cathode plate 13 to flow out smoothly, avoiding slurry accumulation and blockage; the bottom of the electrolytic cell 6 is provided with a slag discharge port 15, which is conical in shape and is connected to the material recovery system 5 via a pipeline; the electrolytic cell The upper and lower sides of the 6 are respectively connected to the outlet pipe 8 and the inlet pipe 7. The outlet pipe 8 is connected to the magnetic separation system 2, and the inlet pipe 7 is connected to the CO2 intelligent replenishment system 11. Larger particles accumulate at the bottom of the electrochemical hardening device 1 and are discharged through the slag discharge port 15. The magnetic separation system 2 separates the magnetic micro-precipitates. The cyclone centrifuge 3 and the electrocoagulation system 4 quickly separate the non-magnetic micro-precipitates. The wastewater separated by sedimentation is discharged from the outlet pipe 10. Large particles and magnetic precipitates are dried, ground, and screened by the material recovery system 5 and then recycled as raw materials for the induced crystallization slurry 9.

[0027] The slurry supply system 14 includes a storage bin 17 and a constant pressure pump 18. The storage bin 17 is filled with an induced crystallization slurry 9, which is made by mechanically mixing deionized water, water-soluble binder, thickener, Fe3O4 powder, activated carbon powder, and induced crystallization material powder. The slurry supply system 24 injects the slurry into the cathode plate 13 cavity of the electrochemical hardening device 1 at a certain pressure, forming protrusions at the micropores 16 on the cathode surface and flowing out at a certain speed.

[0028] The electrochemical hardening device 1 is also connected to an intelligent pressure control system 19. The intelligent pressure control system 19 includes a control cabinet I 20 and an online hardness monitor 21. The constant pressure pump 18 is installed on the pipeline connecting the slurry supply system 24 and the cathode plate 13. The online hardness monitor 21 is installed on the water inlet pipe 7 and transmits signals with the control cabinet I 20. The online hardness monitor 21 monitors the hardness of the inlet water in real time and feeds it back to the control cabinet I. The control cabinet I dynamically adjusts the pressure of the constant pressure pump 18 to control the slurry outflow rate.

[0029] The intelligent CO2 replenishment system 11 includes a control cabinet II 23 and an online pH monitor 22. The online pH monitor 22 is installed inside the electrolytic cell 6 and is electrically connected to the control cabinet II 23. The control cabinet II 23 is connected to the inlet pipe 7. The online pH monitor 22 monitors the pH of the effluent in real time and feeds it back to the control cabinet II 23. The control cabinet II 23 dynamically adjusts the CO2 injection rate through the inlet pipe 7 to maintain HCO32 in the cathode area. - / CO3 2- balance.

[0030] Working principle First, the slurry supply system 24 injects slurry into the hollow cavity of the cathode plate 13 of the electrochemical hardening device 1 at a certain pressure, forming protrusions at the micropores 16 on the surface of the cathode plate 13 and flowing out at a certain speed; then, an electric current is applied, and water is electrolyzed on the surface of the cathode plate 13 and the surface of the slurry. Under the action of the inducing crystallization material, Ca... 2+ / Mg 2+ Scaling occurs on the raised surface; as the slurry flows out and the surface scaling increases, the binder gradually dissolves, causing the slurry strength to decrease. Under the action of gravity and the flushing of water flow, the slurry and scaling fall off the surface of the cathode plate 13, achieving the purpose of self-cleaning; larger particles accumulate at the bottom of the electrochemical hardening device 1 and are discharged through the slag discharge port 15. The magnetic separation system 2 separates the magnetic micro-precipitates, and the cyclone centrifuge 3 and the electrocoagulation system 4 quickly separate the non-magnetic micro-precipitates. The wastewater separated by sedimentation is discharged from the effluent pipe 10; large particles and magnetic precipitates are dried, ground, and screened by the material recovery system 5 and then recycled as raw materials for the induced crystallization slurry 9.

[0031] It should be noted that the induced crystallization slurry 9 is composed of deionized water, water-soluble binder, thickener, Fe3O4 powder, activated carbon powder, and induced crystallization material powder, which are mechanically mixed. The water-soluble binder gives the slurry a certain degree of water solubility and viscosity, while the thickener further enhances the viscosity, allowing it to maintain a certain strength under the scouring of water flow. The Fe3O4 powder gives the slurry magnetic and electrical properties, and the induced crystallization material powder causes scaling to tend to form on the surface of the slurry, preventing scaling on the cathode plate 13. The activated carbon powder further enhances the conductivity of the slurry. It possesses electrical properties and induces crystallization, and can adsorb some other pollutants in wastewater, such as heavy metals and organic matter. During the hardening process, under the action of pressure, water flow, and gravity, the slurry maintains a parallel and continuous flow, and scale gradually forms on the surface of the slurry. At the same time, the gradual dissolution of water-soluble binders and thickeners causes the strength of the mixed slurry to gradually decrease. Finally, under the action of gravity and the scouring of water flow, the mixed slurry and surface scale fall off on their own, achieving the purpose of self-cleaning. Simultaneously, water flows in from the lower part of the cathode plate 13 and flows out from the upper part. Driven by the water flow, it can prevent the generation of OH in the cathode. - Diffusion towards the anode improves hardening efficiency; since the detached precipitate contains induced crystallization slurry 9, and the generated scale can be used as induced crystallization material, it can be recycled as raw material for induced crystallization slurry 9 through treatment.

Claims

1. An electrochemical hardening system with self-cleaning function, characterized in that, The system includes an electrochemical hardening device (1), a magnetic separation system (2), a cyclone centrifuge (3), an electrocoagulation system (4), and a material recovery system (5). The electrochemical hardening device (1), the magnetic separation system (2), the cyclone centrifuge (3), and the electrocoagulation system (4) are connected in sequence. The electrochemical hardening device (1) and the magnetic separation system (2) are both connected to the material recovery system (5). The electrocoagulation system (4) is connected to an outlet pipe (10). The electrochemical hardening device (1) includes an electrolytic cell (6), which is connected to a slurry supply system (24). The electrolytic cell (6) is equipped with an inlet pipe (7) and an outlet pipe (8). The inlet pipe (7) is connected to a CO2 intelligent replenishment system (11).

2. The electrochemical hardening system with self-cleaning function according to claim 1, characterized in that, The electrolytic cell (6) also includes an anode plate (12), a cathode plate (13), and an electrode power supply (14). The anode plate (12) and the cathode plate (13) are respectively connected to the positive and negative terminals of the power supply. The cathode plate (13) is connected to the slurry supply system (24) through a pipeline. The bottom of the electrolytic cell (6) is provided with a slag discharge port (15). The slag discharge port (15) is connected to the material recovery system (5) through a pipeline. The top and bottom of one side of the electrolytic cell (6) are respectively connected to a water outlet pipe (8) and a water inlet pipe (7). The water outlet pipe (8) is connected to the magnetic separation system.

3. The electrochemical hardening system with self-cleaning function according to claim 2, characterized in that, The cathode plate (13) is a hollow porous cathode plate. The hollow porous cathode plate is hollow inside and has micropores (16) evenly distributed on its surface. The diameter of the micropores (16) increases from top to bottom.

4. The electrochemical hardening system with self-cleaning function according to claim 3, characterized in that, The pore size of the micropore (16) is 0.1 mm to 1 mm.

5. The electrochemical hardening system with self-cleaning function according to claim 1, characterized in that, The slurry supply system (24) includes a storage bin (17) and a constant pressure pump (18).

6. The electrochemical hardening system with self-cleaning function according to claim 1, characterized in that, The electrochemical hardening device (1) is also connected to an intelligent pressure control system (19). The intelligent pressure control system (19) includes a control cabinet (20) and an online hardness monitor (21). The constant pressure pump (18) is installed on the pipeline connecting the slurry supply system (24) and the cathode plate (13). The online hardness monitor (21) is installed on the water inlet pipe (7) and transmits signals with the control cabinet (20).

7. The electrochemical hardening system with self-cleaning function according to claim 1, characterized in that, The CO2 intelligent replenishment system (11) includes a control cabinet II (23) and an online pH monitor (22). The online pH monitor (22) is installed inside the electrolytic cell (6). The online pH monitor (22) is electrically connected to the control cabinet II (23). The control cabinet II (23) is connected to the water inlet pipe (7).

8. The electrochemical hardening system with self-cleaning function according to claim 1, characterized in that, The cathode plate (13) is a copper-nickel alloy electrode plate or a stainless steel electrode plate, and the anode plate (12) is a titanium-based coated anode plate.

9. The electrochemical hardening system with self-cleaning function according to claim 1, characterized in that, The slag discharge port (15) is cone-shaped.

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