A circulating water electrochemical decoupling and descaling system and method

Abstract

The application discloses a circulating water electrochemical breakage and descaling system and method, which comprises a core reaction unit, a water storage unit and a water power control system; the core reaction unit comprises an electrochemical reactor and an electrode power supply; the electrochemical reactor comprises a lead electrode and a titanium electrode; the electrode power supply comprises a first electrode power supply with the lead electrode as an anode and the titanium electrode as a cathode, and a second electrode power supply with the titanium electrode as an anode and the lead electrode as a cathode; the water storage unit comprises an adjusting sedimentation tank and a circulating water tank; and the water power control system comprises an inlet pump, a discharge pump and a circulating pump. The titanium electrode and the lead electrode are alternately used as anodes of electrochemical reaction, the breakage reaction is first carried out, and then the descaling reaction is carried out, so that the ability of the system to remove scale ions in circulating water is enhanced. In the application, the electrochemical columnar reactor is used, the mass transfer efficiency of the electrode is increased, and the wastewater treatment performance of the system is improved.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a circulating water electrochemical descaling system and method. Background Technology

[0002] Power plants typically use water as the cooling medium. The circulating cooling water system removes heat generated by the thermal power units through the flow of the cooling medium, ensuring the safe and stable operation of DC power transmission. However, water-cooled systems can experience problems such as equipment corrosion and scaling during operation. Traditionally, power plants treat the external cooling water by adding scale inhibitors to address these issues. Due to heat exchange evaporation and airflow losses, the external cooling water gradually concentrates, becoming wastewater with high salt content, high total phosphorus content, and a certain amount of organic matter, posing a potential environmental pollution risk. Furthermore, continuously adding chemical agents to the external cooling water incurs high economic costs. Therefore, adding an electrochemical device to the water cooling system that can remove scale-forming ions such as calcium and magnesium ions from the external cooling water would significantly improve the long-term operational stability of the water cooling system and reduce its operating costs.

[0003] Existing plate electrodes face several challenges in practical engineering applications. For example, they exhibit numerous dead zones during operation, hindering mixing between the electrode and the wastewater and reducing mass transfer efficiency. Despite continuous design improvements, low mass transfer efficiency and high energy consumption still limit their practical application. Furthermore, optimization processes complicate reactor structures and increase construction costs. Currently, research on treating difficult-to-treat organic wastewater using electrodes other than plate electrodes remains largely at the laboratory stage. Further research is needed to understand the factors influencing electrochemical reactions and their mechanisms, providing a more reliable theoretical basis for practical applications. Summary of the Invention

[0004] The purpose of this invention is to provide an electrochemical descaling system and method for circulating water, so as to achieve effective and stable treatment of circulating water.

[0005] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0006] An electrochemical descaling system for circulating water includes a core reaction unit, a water buffer unit, and a hydraulic control system.

[0007] The core reaction unit includes an electrochemical reactor and an electrode power supply; the electrochemical reactor includes a lead electrode and a titanium electrode; the electrode power supply includes a first electrode power supply with a lead electrode as the anode and a titanium electrode as the cathode, and a second electrode power supply with a titanium electrode as the anode and a lead electrode as the cathode, both providing DC power; the water buffer unit includes a regulating sedimentation tank and a circulating water tank; the hydraulic control system includes an inlet pump, an outlet pump, and a circulating pump.

[0008] The outlet of the inlet pump is connected to the first inlet of the regulating sedimentation tank, the first outlet of the regulating sedimentation tank is connected to the inlet of the core reaction unit via a circulation pump, and the second outlet of the regulating sedimentation tank is connected to the circulating water tank via a discharge pump; the number of the core reaction units is at least one, and the outlet of the core reaction unit is connected back to the second inlet of the regulating sedimentation tank.

[0009] To optimize the above technical solution, the specific measures / limitations also include:

[0010] The water buffer unit also includes an effluent quartz sand buffer tank, and the discharge pump is connected to the circulating water pool via the effluent quartz sand buffer tank.

[0011] It also includes an automatic control system, which includes an inlet pump start / stop control device, an outlet pump start / stop control device, a circulation pump start / stop control device, and a DC power supply on / off control device.

[0012] Furthermore, the hydraulic control system also includes a drain solenoid valve, and the automatic control system also includes a drain solenoid valve on / off control device.

[0013] The number of core reaction units is several, and these core reaction units are connected in parallel with each other.

[0014] Both the lead electrode and the titanium electrode are hollow columnar structures.

[0015] Furthermore, the titanium electrode and the lead electrode have different diameters, with the smaller diameter electrode located inside the larger diameter electrode.

[0016] This invention also protects the method of using the aforementioned electrochemical descaling system for circulating water, comprising the following steps:

[0017] The inlet pump pumps water from the circulating water tank into the regulating sedimentation tank. When the liquid level in the regulating sedimentation tank rises to the set medium level, the circulating pump and DC power supply are turned on. The circulating pump pumps water from the regulating sedimentation tank into the electrochemical reactor. The first electrode power supply and the second electrode power supply are turned on alternately to carry out the complex-breaking reaction targeting the complexes formed by organic matter and target ions in the water, using a lead electrode as the anode, and the descaling reaction targeting the target ions in the water, using a titanium electrode as the anode.

[0018] When the liquid level in the regulating sedimentation tank rises to the set high level, the discharge pump turns on to drain the water from the regulating sedimentation tank to the circulating water tank; when the water level in the regulating sedimentation tank drops to the set medium level, the discharge pump turns off and the circulating pump and DC power supply turn on to continue the complex breaking reaction and descaling reaction.

[0019] By monitoring the water level in the sedimentation tank, the automatic control system controls the start and stop of the inlet pump, outlet pump, circulation pump, and DC power supply to achieve intermittent treatment of the circulating water for breaking down scale and removing fibrous material.

[0020] A portion of the water in the sedimentation tank and the sediment generated by the core reaction unit are periodically discharged through the third outlet via a solenoid valve to ensure that all indicators of the circulating water in the system meet the standards.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] This invention, through experimental research, has found that titanium electrodes possess excellent capabilities for treating high-valence metal cations in wastewater. However, when the organic matter content in the water is high, it forms complexes with these high-valence metal cations, inhibiting the degradation and descaling performance of the titanium electrode. While lead electrodes are less effective at treating high-valence metal cations in wastewater than titanium electrodes, they exhibit excellent oxidative complex-breaking properties. Both titanium and lead electrodes demonstrate good stability. Therefore, this invention uses titanium and lead electrodes alternately as the anodes in the electrochemical reaction, first performing the complex-breaking reaction and then the descaling reaction. This significantly enhances the ability of the electrochemical column reactor to remove scale ions from circulating water.

[0023] This invention addresses a series of problems associated with plate electrodes by utilizing an electrochemical columnar reactor with a larger specific surface area. For the same specific surface area, the volume of a columnar electrode is smaller than that of a plate electrode. This results in a smaller dead zone and faster fluid flow, significantly increasing the mass transfer efficiency of the columnar electrode, reducing energy consumption, and effectively improving its wastewater treatment performance. Furthermore, the columnar electrode has a simpler structure, making it easier to integrate into the overall water treatment system and facilitating regular maintenance.

[0024] Based on an electrochemical column reactor as the core reaction unit, this invention, by setting up a water buffer unit, a hydraulic control system and an automatic control system, can simultaneously break down complexes and remove scale from multiple substances in circulating water. Through various experiments, the optimal operating conditions have been obtained, enabling the system to operate automatically and stably for a long time.

[0025] Considering that scale inhibitors that may remain in the circulating water may hinder the removal of target metal cations, this invention uses titanium electrodes with higher removal performance and lead electrodes with higher oxidation and complex-breaking capabilities as alternating anodes. This is beneficial for the system to handle more complex and variable wastewater when connected to an actual factory.

[0026] The circulating water electrochemical complex breaking and descaling system and method proposed in this invention can remove target high-valence metal cations in circulating water without adding any reagents or auxiliary processes such as membrane separation. It solves the problem of easy scaling in water cooling systems, reduces the operating cost of water cooling systems, and has the advantages of being economical, simple, efficient and easy to promote. Attached Figure Description

[0027] Figure 1 : A schematic diagram of the structure of the circulating water electrochemical descaling system of the present invention.

[0028] Figure 2 : A schematic diagram of the core reaction unit of this invention.

[0029] Figure 3 The effect of different current densities on water treatment.

[0030] Figure 4 The effect of different initial calcium ion concentrations on water treatment.

[0031] Figure 5 The impact of different organic matter concentrations on water treatment.

[0032] Figure 6 : The removal rate of calcium ions in circulating water during automated operation. Detailed Implementation

[0033] The present invention will be further described in detail below through embodiments, but it should not be construed as limiting the scope of the subject matter of the present invention to the following embodiments. All technologies implemented based on the above content of the present invention fall within the scope of the present invention.

[0034] Unless otherwise specified, the experimental methods used in the following examples are conventional methods, and the reagents, methods and equipment used are conventional reagents, methods and equipment in this technical field.

[0035] The following are explanations and descriptions of some terms used in this invention:

[0036] The lead electrode in this invention is a lead electrochemical electrode with lead as the main component, and the titanium electrode in this invention is a titanium electrochemical electrode with titanium as the main component.

[0037] This invention provides a circulating water electrochemical descaling system, comprising a core reaction unit, a water buffer unit, a hydraulic control system, and an automatic control system;

[0038] The core reaction unit includes an electrochemical reactor and an electrode power supply; the electrochemical reactor includes lead electrodes and titanium electrodes, and the electrode power supply includes a first electrode power supply with lead electrodes as anodes and titanium electrodes as cathodes, and a second electrode power supply with titanium electrodes as anodes and lead electrodes as cathodes, both powered by DC; the water buffer unit includes a regulating sedimentation tank, an effluent quartz sand buffer tank, and a circulating water tank; the hydraulic control system includes an influent pump, an effluent pump, a circulating pump, and an emptying solenoid valve;

[0039] The outlet of the inlet pump is connected to the first inlet of the regulating sedimentation tank. The first outlet of the regulating sedimentation tank is connected to the inlet of the core reaction unit via a circulation pump. The second outlet of the regulating sedimentation tank is connected to the circulating water pool via a discharge pump. An effluent quartz sand buffer tank is provided in front of the circulating water pool. The discharge pump is connected to the circulating water pool via the effluent quartz sand buffer tank. There is at least one core reaction unit. The outlet of the core reaction unit is connected back to the second inlet of the regulating sedimentation tank.

[0040] The automatic control system includes an inlet pump start / stop control device, an outlet pump start / stop control device, a circulation pump start / stop control device, a DC power supply on / off control device, and an air vent solenoid valve on / off control device.

[0041] There are several core reaction units, which are connected in parallel.

[0042] Both lead and titanium electrodes are hollow cylindrical structures. The titanium and lead electrodes differ in diameter, with the smaller diameter electrode located inside the larger diameter electrode.

[0043] This invention also provides a method of using the electrochemical descaling system for circulating water, comprising the following steps:

[0044] The inlet pump pumps water from the circulating water tank into the regulating sedimentation tank. When the liquid level in the regulating sedimentation tank rises to the set medium level, the circulating pump and DC power supply are turned on. The circulating pump pumps water from the regulating sedimentation tank into the electrochemical reactor. The first electrode power supply and the second electrode power supply are turned on alternately to carry out the complex-breaking reaction targeting the complexes formed by organic matter and target ions in the water, using a lead electrode as the anode, and the descaling reaction targeting the target ions in the water, using a titanium electrode as the anode.

[0045] When the liquid level in the regulating sedimentation tank rises to the set high level, the discharge pump turns on to drain the water from the regulating sedimentation tank to the circulating water tank; when the water level in the regulating sedimentation tank drops to the set medium level, the discharge pump turns off and the circulating pump and DC power supply turn on to continue the complex breaking reaction and descaling reaction.

[0046] By monitoring the water level in the sedimentation tank, the automatic control system controls the start and stop of the inlet pump, outlet pump, circulation pump, and DC power supply to achieve intermittent treatment of the circulating water for breaking down scale and removing fibrous material.

[0047] The present invention will be further described in detail below with reference to specific embodiments:

[0048] An electrochemical descaling system and method for circulating water:

[0049] The system consists of four components:

[0050] The system comprises a core reaction unit, a water buffer unit, a hydraulic control system, and an automatic control system. The core reaction unit includes an electrochemical column reactor and an electrode power supply. The electrochemical column reactor consists of eight cylinders, each 180mm in diameter and 1500mm high. Inside the reactor are columnar electrochemical electrodes, primarily composed of titanium and lead, connected in parallel. The power supply is connected to the electrodes of the column reactor via DC power, with an output voltage of 0-25V, an output current of 0-500A, and a maximum power of 14kW. The water buffer unit includes a settling tank and an effluent quartz sand buffer tank. The settling tank is a 1.2×2.0×2.0m water tank made of 304 stainless steel, with epoxy coal tar pitch for corrosion protection on the inner wall. The design flow rate is 1.2m³ / h. 3 / h, hydraulic retention time is 4h, effective volume is 3.0m³. 3 The effluent quartz sand buffer tank is a cylindrical tank made of fiberglass, with a diameter of 520mm and a height of 700mm. The buffer tank is filled with quartz sand with a particle size of 1-2mm and has a pressure rating of 0.8kPa. The hydraulic control system includes an inlet pump, a circulation pump, a discharge pump, and a drain solenoid valve. The inlet pump has a maximum flow rate of 1.2m³ / h. 3 A self-priming pump with a flow rate of 1.0 m / h, a head of 18 m, and a power of 0.65 kW; and a circulating pump with a flow rate of 2.0 m³ / h. 3 A horizontal centrifugal pump with a flow rate of 0.65 kW, a head of 9 m, and a power of 0.65 kW; and a discharge pump with a maximum flow rate of 3.0 m³ / h. 3 A horizontal centrifugal pump with a head of 20m and a power of 0.80kW per hour; an automatic control system including discharge pump start / stop control and solenoid valve open / close control;

[0051] The system operates automatically:

[0052] During automated operation, circulating water is drawn from the cooling water pool (circulating water pool) of the power plant's water-cooling system into the regulating sedimentation tank by the inlet pump. The water level in the regulating sedimentation tank gradually increases, and when it reaches the intermediate level, the circulating pump and DC power supply are activated. The circulating water then enters the electrochemical column reactor, where a lead electrode serves as the anode and a titanium electrode as the cathode. Electrochemical oxidation and complex breaking occur, separating the target high-valence metal cations from the organic matter and releasing them into the circulating water. After 1 hour of oxidation and complex breaking, the anode and cathode in the electrochemical column reactor are switched, with a titanium electrode as the anode and a lead electrode as the cathode. The target high-valence metal cations in the circulating water are removed through an electrochemical reaction. The circulating water circulates between the regulating sedimentation tank and the electrochemical column reactor for a period of time under the action of the circulating pump, so that most of the calcium salt precipitates generated remain in the regulating sedimentation tank. The inlet pump continuously supplies water, causing the water level in the regulating sedimentation tank to gradually increase. When the water level exceeds the specified high level, the discharge pump is turned on, allowing the circulating water to enter the effluent quartz sand buffer tank. Under the action of the quartz sand filled inside, the residual calcium salt precipitates in the circulating water are filtered out. The effluent is then pumped back to the cooling water pool (circulating water pool) of the power plant's water cooling system through the discharge pump. Part of the water in the regulating sedimentation tank and the precipitates generated by the electrochemical module (core reaction unit) are periodically discharged to the rainwater well through the third outlet via the drain solenoid valve, ensuring that all indicators of the system's circulating water meet the standards.

[0053] The following are examples of experiments conducted on various indicators affecting system operating conditions:

[0054] Example 1: Study on the effect of current density on water treatment

[0055] Step 1: Turn on the inlet pump and let water flow for 15 minutes until the water level in the sedimentation tank reaches the specified level. Then, turn off the inlet pump and stop the water flow.

[0056] Step 2: Turn on the circulation pump and circulate for 5 minutes to fill the electrochemical column reactor with the circulating water to be treated.

[0057] Step 3: Turn on the DC power supply and adjust the DC current to 20A, so that the current density in the electrochemical column reactor is 5A / m³. 2 At this point, with the lead electrode as the anode and the titanium electrode as the cathode, the oxidation and complex breaking process is carried out for 1 hour.

[0058] Step 4: Switch the anode and cathode, using the titanium electrode as the anode and the lead electrode as the cathode, and start the electrochemical descaling test. The test time is 300 min, and samples are taken at 0 min, 60 min, 120 min, 180 min, 240 min and 300 min respectively. After the test is completed, turn off the circulation pump.

[0059] Step 5: Turn on the drain pump and drain the water for 20-30 minutes to empty the water in the sedimentation tank.

[0060] Step 6: Open the solenoid valves for venting the settling tank and the electrochemical column reactor to drain the remaining water and sediment from the settling tank and the electrochemical column reactor. After draining for 5 minutes, close the solenoid valves.

[0061] Step 7: After adjusting the DC current to 40A, 60A, 80A, 120A, 160A, and 200A, repeat the above process.

[0062] Step 8: Measure the conductivity, pH, calcium ion concentration, magnesium ion concentration and TOC in the sample respectively.

[0063] Example 2: Study on the effect of calcium ion concentration in circulating water on water treatment

[0064] Step 1: Turn on the inlet pump and let water flow for 15 minutes until the water level in the sedimentation tank reaches the specified level. Then, turn off the inlet pump and stop the water flow.

[0065] Step 2: Turn on the circulation pump and circulate for 5 minutes to fill the electrochemical column reactor with the circulating water to be treated. Add the dissolved CaCl2 solution to the settling tank to adjust the calcium ion concentration in the circulating water to 70 mg / L.

[0066] Step 3: Turn on the DC power supply and adjust the DC current to 40A, so that the current density in the electrochemical column reactor is 10A / m³. 2 At this point, with the lead electrode as the anode and the titanium electrode as the cathode, the oxidation and complex breaking process is carried out for 1 hour.

[0067] Step 4: Switch the anode and cathode, using the titanium electrode as the anode and the lead electrode as the cathode, and start the electrochemical descaling test. The test time is 300 min, and samples are taken at 0 min, 60 min, 120 min, 180 min, 240 min and 300 min respectively. After the test is completed, turn off the circulation pump.

[0068] Step 5: Turn on the drain pump and drain the water for 20-30 minutes to empty the water in the sedimentation tank.

[0069] Step 6: Open the solenoid valves for venting the settling tank and the electrochemical column reactor to drain the remaining water and sediment from the settling tank and the electrochemical column reactor. After draining for 5 minutes, close the solenoid valves.

[0070] Step 7: Add dissolved CaCl2 solutions of different concentrations to the sedimentation tank to adjust the calcium ion concentration in the circulating water to 100 mg / L, 150 mg / L, 200 mg / L, 300 mg / L and 500 mg / L respectively.

[0071] Step 8: Measure the conductivity, pH, calcium ion concentration, magnesium ion concentration and TOC in the sample respectively.

[0072] Example 3: Study on the effect of organic matter concentration in circulating water on water treatment

[0073] Step 1: Turn on the inlet pump and let water flow for 15 minutes until the water level in the sedimentation tank reaches the specified level. Then, turn off the inlet pump and stop the water flow.

[0074] Step 2: Turn on the circulation pump and circulate for 5 minutes to fill the electrochemical column reactor with the circulating water to be treated. Add the dissolved HCOONa solution to the settling tank to adjust the Ca:HCOONa ratio in the circulating water to 2:1.

[0075] Step 3: Turn on the DC power supply and adjust the DC current to 40A, so that the current density in the electrochemical column reactor is 10A / m³. 2 At this point, with the lead electrode as the anode and the titanium electrode as the cathode, the oxidation and complex breaking process is carried out for 1 hour.

[0076] Step 4: Switch the anode and cathode, using the titanium electrode as the anode and the lead electrode as the cathode, and start the electrochemical descaling test. The test time is 300 min, and samples are taken at 0 min, 60 min, 120 min, 180 min, 240 min and 300 min respectively. After the test is completed, turn off the circulation pump.

[0077] Step 5: Turn on the drain pump and drain the water for 20-30 minutes to empty the water in the sedimentation tank.

[0078] Step 6: Open the solenoid valves for venting the settling tank and the electrochemical column reactor to drain the remaining water and sediment from the settling tank and the electrochemical column reactor. After draining for 5 minutes, close the solenoid valves.

[0079] Step 7: Add dissolved HCOONa solutions with concentrations of 70 mg / L, 140 mg / L, and 210 mg / L to the sedimentation tank to adjust the Ca concentration in the circulating water. 2+ and HCOO - Ca 2+ HCOO - =1:1, Ca 2+ HCOO - =1:2, Ca 2+ HCOO - =1:3.

[0080] Step 8: Measure the conductivity, pH, calcium ion concentration, magnesium ion concentration and TOC in the sample respectively.

[0081] Example 4: Study on the long-term automated stability of the system and its effect on water treatment

[0082] Step 1: Start the automation program, turn on the water pump, let water in for 15 minutes, and adjust the water level in the sedimentation tank to reach the set medium level.

[0083] Step 2: Turn on the circulation pump and DC power supply, and adjust the DC current to 40A, so that the current density in the electrochemical column reactor is 10A / m³. 2 At this point, with the lead electrode as the anode and the titanium electrode as the cathode, the oxidation and complex breaking process is carried out for 1 hour.

[0084] Step 3: Switch the anode and cathode, using the titanium electrode as the anode and the lead electrode as the cathode, and begin the electrochemical descaling test for 5 hours.

[0085] Step 4: Switch the anode and cathode, and repeat the above oxidation and descaling tests.

[0086] Step 5: Adjust the water level in the sedimentation tank to the set high level, turn on the discharge pump, adjust the water level in the sedimentation tank to drop, and turn off the discharge pump when the water level drops to the set medium level.

[0087] Step 6: After completing 5 sets of oxidation complex breaking and descaling tests in a cycle, open the venting solenoid valve of the sedimentation tank and the venting solenoid valve of the electrochemical column reactor for 5 minutes, and then close the venting solenoid valve.

[0088] Step 7: Conduct a set of oxidation complex breaking and descaling tests every day, and turn off the automatic program after the test is completed.

[0089] Step 8: Take samples before starting the automation program and after ending the automation program, and measure the conductivity, pH, calcium ion concentration, magnesium ion concentration and TOC in the samples respectively, and calculate the calcium and magnesium ion removal rates and TOC removal rates.

[0090] The optimal test parameters for the Chinese-style test apparatus system were explored by changing the test parameters selected in Examples 1-3, and the stability of the system under long-term automatic operation was examined through the test in Example 4, so as to determine the application prospects of the system.

[0091] from Figure 3 As can be seen from Example 1, this invention explores the optimal current density by varying the current density of the system during operation. Under otherwise identical conditions, it is evident that when the current density exceeds 10 A / m... 2 At this time, the effect of current density on calcium ion removal rate becomes smaller. When the current density is 5 A / m 2 At that time, the system's calcium ion removal rate was only 26%, and when the current density reached 10 A / m 2At currents of 10 A / m³ and above, the system achieves a calcium ion removal rate of approximately 40%. Therefore, the optimal current density for this system is 10 A / m³. 2 .

[0092] from Figure 4 As can be seen from Example 2, this invention explores the optimal initial calcium ion concentration for the system during operation by varying the initial calcium ion concentration in the circulating water. Under the same conditions, when the initial calcium ion concentration is 100 mg / L, the system achieves the highest calcium ion removal rate in the circulating water, reaching 60%. While the calcium ion removal rate decreases as the initial calcium ion concentration increases, the amount of calcium ions removed by the system increases. This indicates that the system's removal capacity has not yet reached saturation, and its calcium ion removal capacity can be further improved by adding electrode groups. Additionally, multiple cycles can be used to remove calcium ions from high-concentration calcium-containing wastewater.

[0093] from Figure 5 The results show that when the concentration of HCOONa is 70 mg / L, the removal rate of calcium ions by this system does not decrease significantly, only by 5%. This indicates that the system has good complex-breaking ability. HCOONa combines with calcium ions in water to form calcium formate complexes, thus preventing calcium ions from precipitating and separating from the water. The system first breaks down the complex, releasing the calcium ions contained in the complex into the water, and then forms a precipitate on the electrode, thereby separating the calcium ions from the circulating water. However, when the concentration of HCOONa increases, the removal rate of calcium ions by this system decreases, indicating that its complex-breaking ability has an upper limit.

[0094] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent substitutions, and improvements made by those skilled in the art to the above embodiments without departing from the scope of the technical solution of the present invention, based on the technical essence of the present invention, shall still fall within the protection scope of the technical solution of the present invention.

Claims

1. A circulating water electrochemical descaling system, characterized in that: Includes the core reaction unit, water buffer unit, and hydraulic control system; The core reaction unit includes an electrochemical reactor and an electrode power supply; the electrochemical reactor includes a lead electrode and a titanium electrode; the electrode power supply includes a first electrode power supply with a lead electrode as the anode and a titanium electrode as the cathode, and a second electrode power supply with a titanium electrode as the anode and a lead electrode as the cathode, both providing DC power; the water buffer unit includes a regulating sedimentation tank and a circulating water tank; the hydraulic control system includes an inlet pump, an outlet pump, and a circulating pump. The outlet of the inlet pump is connected to the first inlet of the regulating sedimentation tank, the first outlet of the regulating sedimentation tank is connected to the inlet of the core reaction unit via a circulation pump, and the second outlet of the regulating sedimentation tank is connected to the circulating water tank via a discharge pump; the number of the core reaction units is at least one, and the outlet of the core reaction unit is connected back to the second inlet of the regulating sedimentation tank. The inlet pump pumps water from the circulating water tank into the regulating sedimentation tank. When the liquid level in the regulating sedimentation tank rises to the set medium level, the circulating pump and DC power supply are turned on. The circulating pump pumps water from the regulating sedimentation tank into the electrochemical reactor. The first electrode power supply and the second electrode power supply are turned on alternately to carry out the complex-breaking reaction targeting the complexes formed by organic matter and target ions in the water, using a lead electrode as the anode, and the descaling reaction targeting the target ions in the water, using a titanium electrode as the anode. When the liquid level in the settling tank rises to the set high level, the discharge pump turns on, draining the water from the settling tank to the circulating water tank; when the water level in the settling tank drops to the set medium level, the discharge pump turns off, and the circulating pump and DC power supply turn on, continuing the complex breaking reaction and descaling reaction.

2. The circulating water electrochemical descaling system according to claim 1, characterized in that: The water buffer unit also includes an effluent quartz sand buffer tank, and the discharge pump is connected to the circulating water pool via the effluent quartz sand buffer tank.

3. The circulating water electrochemical descaling system according to claim 1, characterized in that: It also includes an automatic control system, which includes an inlet pump start / stop control device, an outlet pump start / stop control device, a circulation pump start / stop control device, and a DC power supply on / off control device.

4. The circulating water electrochemical complex-breaking and descaling system according to claim 3, characterized in that: The hydraulic control system further includes a drain solenoid valve, and the automatic control system further includes a drain solenoid valve on / off control device.

5. The circulating water electrochemical complex-breaking and descaling system according to claim 1, characterized in that: The number of core reaction units is several, and these core reaction units are connected in parallel with each other.

6. The circulating water electrochemical complex-breaking and descaling system according to claim 1, characterized in that: Both the lead electrode and the titanium electrode are hollow columnar structures.

7. The circulating water electrochemical complex-breaking and descaling system according to claim 6, characterized in that: The titanium and lead electrodes have different diameters, with the smaller diameter electrode located inside the larger diameter electrode.

8. The circulating water electrochemical complex-breaking and descaling system according to claim 1, characterized in that: By monitoring the water level in the sedimentation tank, the automatic control system controls the start and stop of the inlet pump, outlet pump, circulation pump, and DC power supply to achieve intermittent treatment of the circulating water for breaking down scale and removing fibrous material.

9. The circulating water electrochemical complex-breaking and descaling system according to claim 1, characterized in that: A portion of the water in the sedimentation tank and the sediment generated by the core reaction unit are periodically discharged through the third outlet via a solenoid valve to ensure that all indicators of the circulating water in the system meet the standards.

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