Industrial circulating cooling water treatment system and method

Abstract

The invention relates to an industrial circulating cooling water treatment system and method. According to the industrial circulating cooling water treatment system and method, a resistance scale instrument is installed on the outer wall of a cooling water conveying pipeline, and pipeline scaling is restrained through electromagnetic induction; the electrochemical descaling system comprises an electrochemical reaction tank, a composite membrane polar plate and a sedimentation tank, and is used for removing calcium and magnesium ions, sterilizing and killing algae; the control system is used for controlling the operation of the industrial circulating cooling water treatment system and adjusting the electric field intensity of the electrochemical reaction tank. According to the scheme provided by the invention, efficient treatment of industrial circulating cooling water can be realized through the synergistic effect of the resistance scale meter, the electrochemical descaling system and the control system, the cooling water is electrolyzed through the electrochemical reaction tank, and the composite membrane polar plate is matched to realize removal of calcium and magnesium ions and sterilization and algae removal, so that the scale removal rate is increased; the water supplementing amount of industrial water and the dependence on chemical agents are reduced, and the repeated utilization rate of industrial cooling water is increased.

Description

Technical Field

[0001] The present application relates to the technical field of process circulating cooling water treatment, and in particular to an industrial circulating cooling water treatment system and method. Background Art

[0002] In urban water use, industrial water accounts for about 60-80% of the total water use, while industrial cooling water accounts for 70-80% of the total industrial water use. However, relevant data show that the average reuse rate of industrial water in my country is 40-50%. my country's urban industrial water consumption per 10,000 yuan of output value is 340 cubic meters. High water consumption and low reuse rate are prominent problems in the utilization of water resources in my country's industrial system. Saving industrial cooling water and making the maximum use of limited water resources are the top priorities of water conservation in the industrial field. The use of circulating cooling water technology is the main method of water conservation in the industrial field.

[0003] In the operation of industrial circulating cooling water systems, the concentration ratio is an important technical indicator for determining the status of the system. When using circulating cooling water treatment technology, when the concentration ratio reaches 2.0 times, more than 95% of fresh water can be saved compared with direct current water. In order to increase the concentration ratio of circulating water, the method of adding slow-release antiscalants is often used. In recent years, some companies have also adopted electrochemical methods. However, conventional technologies have many shortcomings. For example, the concentration ratio is low, usually around 3; the dosage is large, not only slow-release antiscalants need to be added, but also sulfuric acid needs to be added regularly to reduce alkalinity, as well as oxidizing and non-oxidizing bactericides; electrochemical treatment of circulating water has problems such as low removal rate, difficulty in removing the generated scale, complex structure, short maintenance cycle, large maintenance workload, and system paralysis and abandonment. Summary of the invention

[0004] In order to solve or partially solve the problems existing in the related art, the present application provides an industrial circulating cooling water treatment system and method, aiming to solve the problem of low reuse rate of industrial circulating cooling water.

[0005] The present application provides an industrial circulating cooling water treatment system, comprising: Resistance scale meter, electrochemical descaling system and control system; The scale resistance meter is installed on the outer wall of the cooling water delivery pipeline to inhibit pipeline scaling through electromagnetic induction; The electrochemical descaling system includes an electrochemical reaction tank, a composite membrane plate and a sedimentation tank, which are used to remove calcium and magnesium ions and sterilize and kill algae. The electrochemical reaction tank is connected to a circulating water tank through a lifting pump, the cation outlet pipe of the electrochemical reaction tank is connected to the circulating water tank, the anion outlet pipe is connected to the sedimentation tank, and the sedimentation tank is connected to the circulating water tank and the scale collection tank respectively. The composite membrane plate is installed between the cathode plate and the anode plate of the electrochemical reaction tank. A selective permeable membrane and a soluble metal are arranged on the composite membrane plate. The soluble metal is installed on the upper end of the selective permeable membrane. The metal ions released by the soluble metal have a flocculating effect, which are combined with fine scale particles in the cathode area of ​​the electrochemical reaction tank to form large scale particles, which enter the sedimentation tank with the cathode water; The control system is used to control the operation of the industrial circulating cooling water treatment system and adjust the electric field strength of the electrochemical reaction tank.

[0006] Optionally, in some embodiments, the control system includes: PLC controller, data acquisition module, data processing module, drive module, communication module, alarm module, power module, communication module, server and database; The data acquisition module is used to collect the operation data of the circulating cooling water treatment system. The data acquisition module is connected to the data processing module for data processing. The data processing module uses the collected voltage value, current value and conductivity value of the circulating cooling water treatment system as well as the drain valve feedback, the water inlet valve feedback and the switch signal of the electrolysis power supply as input signals, and converts the digital quantity for the operation of the PLC controller; The serial port of the data processing module is connected to the PLC controller, and the PLC controller is connected to the drive module, the communication module and the alarm module; The drive module is connected to control the electrochemical reaction tank, lift pump and valve in the circulating cooling water treatment system. The drive module receives instructions sent by the PLC controller to control the DC voltage of the positive and negative plates of the electrochemical reaction tank, the current of the lift pump and the switch value of the drain valve and the water inlet valve; The communication module is connected to the server by wireless communication, the server is connected to the database, and the server and the database are connected to the control interface to realize remote monitoring of the working condition of the circulating cooling water treatment system and remote adjustment.

[0007] Optionally, in some embodiments, the electrochemical reaction tank includes a reaction tank body, a sealing plate, a pressure plate, a pressure rod, a locking nut, a cathode plate, an anode plate and a composite membrane plate; The cathode plate and the anode plate are installed in the reaction tank body at intervals, the composite membrane plate is installed between the cathode plate and the anode plate, the composite membrane plate includes a clip, a selective permeable membrane and a soluble metal, the selective permeable membrane and the soluble metal are installed in the clip, and the soluble metal is installed on the upper end of the selective permeable membrane; The pressure rod is installed on the water outlet end of the reaction tank body through a locking nut, the pressure plate is installed between the sealing plate and the pressure rod, and the sealing plate is installed on the water outlet ends of the cathode plate and the anode plate through the pressure plate and the pressure rod; After the circulating cooling water enters the reaction tank body, it enters the gap between the anode and cathode plates respectively. Under the action of the DC electric field, the ions in the circulating cooling water between the anode and cathode plates pass through the left and right sides of the selective permeable membrane of the composite membrane plate to form high-concentration alkaline water on the cathode plate side and high-concentration acid washing water on the anode plate side; the fine scale particles contained in the alkaline water combine with the metal ions with flocculation effect released by the soluble metals on the upper part of the composite membrane plate to form large-particle scale particles that are easy to precipitate and enter the sedimentation tank for precipitation, and the effluent from the sedimentation tank returns to the circulating water tank.

[0008] Optionally, in some embodiments, the cathode plate is a titanium-plated platinum plate, the anode plate is a titanium-based mixed metal plate, and the distance between the cathode plate and the anode plate is ≤10 mm; A DC voltage of 10-30V is applied to the cathode plate and the anode plate; The cathode region generates high concentration of OH⁻, pH ≥ 10.5, which promotes the precipitation of Ca²⁺ / Mg²⁺ in the form of CaCO3 and Mg(OH)2; Electrolysis in the anode area produces hydroxide ions, negative oxygen ions, chloride ions, ozone, hydrogen peroxide, chlorine and hypochlorous acid with a concentration of ≥5ppm, which can replace chemical bactericides.

[0009] Optionally, in some embodiments, the scale resistance meter is clamped on the outer wall of the circulating water tank delivery pipeline, the frequency is 5-20kHz, and the magnetic field strength is ≥500Gauss; When working, it converts electrical energy into magnetic energy, and through electromagnetic induction, it continuously performs electro-magnetic conversion around the main pipeline, forms an induction field in the water, prevents ions from forming scale, and slowly removes old scale.

[0010] Optionally, in some embodiments, the industrial circulating cooling water treatment system further comprises: Chemical backwash system; The chemical backwash system is bidirectionally connected to the electrochemical reaction tank. The water inlet of the chemical backwash system is connected to the anode outlet pipe to store acidic water to clean the cathode of the electrochemical reaction tank to prevent residual scale from covering the cathode plate. The acid water of the chemical backwash system is sent to the sedimentation tank and is neutralized with anion water and returned to the circulating water tank.

[0011] The second aspect of the present application provides an industrial circulating cooling water treatment method, comprising: After the control system detects that the water volume in the circulating water pool meets the processable water volume, it controls the lifting pump to transport cooling water to the electrochemical reaction tank; Start the scale resistance instrument on the cooling water delivery main pipeline. The scale resistance instrument converts electrical energy into magnetic energy, continuously performs electrical-magnetic conversion, forms an induction field in the water, prevents ions from forming scale, and slowly removes old scale. After entering the electrochemical reaction tank, the circulating cooling water enters the gap between the anode and cathode plates respectively. Under the action of the DC electric field, the cooling water is electrolyzed. The control system detects the pH value of the cooling water in the electrochemical reaction tank. After the electrolysis is completed, high-concentration alkaline water is formed on the cathode plate side, and the generated scale particles enter the sedimentation tank with the cationic water for precipitation. High-concentration acidic water is formed on the anode plate side and enters the circulating water tank for sterilization operation. The water inlet of the chemical backwash system is connected to the anode outlet pipe to store acidic water, clean the cathode of the electrochemical reaction tank, and return it to the circulating water pool after being neutralized with anionic water to complete the cooling water treatment.

[0012] Optionally, in some embodiments, after the circulating cooling water enters the electrochemical reaction tank, it enters the gap between the cathode and anode plates respectively, and electrolysis of the cooling water is performed under the action of a DC electric field, including: Under the action of the DC electric field, the cooling water undergoes a hydrogen evolution reaction on the cathode region, precipitating hydrogen ions in the bicarbonate and hydrogen ions in the water; A large amount of active oxidizing substances, such as hydroxide ions, negative oxygen ions, chloride ions, ozone, hydrogen peroxide, chlorine gas and hypochlorous acid, are precipitated at the anode; The ions in the circulating water between the anode and cathode plates pass through the selective permeable membrane at the bottom of the composite membrane plate, forming high-concentration alkaline water in the cathode area and high-concentration acid washing water in the anode area. Calcium and magnesium ions combine with negative ions near the cathode to produce calcium carbonate, calcium hydroxide, and magnesium hydroxide scaling products, causing scale precipitation; strong oxidizing substances produced near the anode kill bacteria and algae in the circulating cooling water; With the movement of cooling water, the fine scale particles contained in the alkaline water combine with the metal ions with flocculation effect released by the soluble metal on the upper part of the composite membrane plate to form large scale particles that are easy to precipitate. After the cathode water passes through the sedimentation tank, it returns to the circulating water tank; The anode water returns to the circulating water pool to adjust the pH value of the circulating water pool, and achieve the purpose of anti-corrosion, sterilization and algae removal, realizing environmentally friendly circulating cooling water treatment.

[0013] Optionally, in some embodiments, the cooling water is electrolyzed under the action of a DC electric field, further comprising: The suspended matter in the cooling circulating water passes through the strong acid and strong alkaline environment inside the electrochemical reaction tank alternately, and the surface charge is destroyed and unstable, and it is deposited to the bottom of the reaction chamber and discharged during the flushing process of the chemical backwash system, thereby reducing the suspended matter in the cooling water.

[0014] The technical solution provided by this application may have the following beneficial effects: Through the synergistic effect of the scale resistor, electrochemical descaling system and control system, efficient treatment of industrial circulating cooling water is achieved. The cooling water is electrolyzed by the electrochemical reaction tank, and combined with the composite membrane plate, calcium and magnesium ions are removed and sterilization and algae removal are achieved, thereby improving the scale removal rate. The industrial circulating cooling water treatment system increases the concentration factor to 6, significantly reducing the amount of industrial water replenishment and dependence on chemical agents, improving the reuse rate of industrial cooling water, and automatically controlling the operation of the industrial circulating cooling water treatment system through the control system, reducing the workload of industrial circulating cooling water treatment.

[0015] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0017] Figure 1 It is a structural schematic diagram of an industrial circulating cooling water treatment system shown in an embodiment of the present application; Figure 2 It is a schematic diagram of the connection of the electrochemical reaction tank of the industrial circulating cooling water treatment system shown in the embodiment of the present application; Figure 3 It is a schematic diagram of the structure of the electrochemical reaction tank of the industrial circulating cooling water treatment system shown in the embodiment of the present application; Figure 4 It is a schematic diagram of the composite membrane plate structure of the industrial circulating cooling water treatment system shown in the embodiment of the present application; Figure 5 It is a schematic diagram of a control system of an industrial circulating cooling water treatment system shown in an embodiment of the present application.

[0018] Figure numerals: 1-circulating water tank, 2-scale resistance meter, 3-electrochemical reaction tank, 301-reaction tank body, 302-sealing plate, 303-pressure plate, 304-pressure rod, 305-locking nut, 306-cathode plate, 307-anode plate, 308-composite membrane plate, 3081-clamp, 3082-selective permeable membrane, 3083-soluble metal, 4-sedimentation tank, 5-chemical backwash system. DETAILED DESCRIPTION

[0019] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0020] The technical solution of the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0021] Figure 1 It is a structural schematic diagram of an industrial circulating cooling water treatment system shown in an embodiment of the present application.

[0022] See also Figure 1 , an industrial circulating cooling water treatment system, comprising: Resistance scale meter 2, electrochemical descaling system, chemical backwash system 5 and control system; The scale resistance instrument 2 is connected to the outer wall of the conveying pipe of the circulating water pool 1, with a frequency of 5-20kHz and a magnetic field strength of ≥500Gauss. The scale resistance instrument 2 converts electrical energy into magnetic energy when working, and continuously performs electrical-magnetic conversion around the main pipe through electromagnetic induction, forming an induction field in the water, preventing ions from forming scale, and slowly removing old scale. The scale resistance instrument 2 does not contact water, is not restricted by pipe materials, does not change the chemical composition of cooling water, does not interfere with other electronic equipment, and is powered by AC 220V, with a maximum power of no more than 100W, which can effectively save 5-30% energy and 75% water.

[0023] The electrochemical descaling system includes an electrochemical reaction tank 3, a composite membrane plate 308 and a sedimentation tank 4, which are used to remove calcium and magnesium ions and sterilize and kill algae. The electrochemical reaction tank 3 is connected to the circulating water tank 1 through a lifting pump, the cation outlet pipe of the electrochemical reaction tank 3 is connected to the circulating water tank 1, and the anion outlet pipe is connected to the sedimentation tank 4, and the sedimentation tank 4 is respectively connected to the circulating water tank 1 and the scale collection tank. The electrochemical reaction tank 3 includes a reaction tank body 301, a sealing plate 302, a pressure plate 303, a pressure rod 304, a locking nut 305, a cathode plate 306, an anode plate 307 and a composite membrane plate 308; the cathode plate 306 and the anode plate 307 are installed in the reaction tank body 301 at intervals, the cathode plate 306 is a titanium platinum-plated plate, the anode plate 307 is a titanium-based mixed metal plate, and the spacing between the cathode plate 306 and the anode plate 307 is ≤10mm; a DC voltage of 10-30V is loaded on the cathode plate 306 and the anode plate 307. The composite membrane plate 308 is installed between the cathode plate 306 and the anode plate 307. The composite membrane plate 308 includes a clip 3081, a selective permeable membrane 3082 and a soluble metal 3083. The selective permeable membrane 3082 and the soluble metal 3083 are installed in the clip 3081, and the soluble metal 3083 is installed on the upper end of the selective permeable membrane 3082. The pressure rod 304 is installed on the water outlet end of the reaction tank body 301 through a locking nut 305, and the pressure plate 303 is installed between the sealing plate 302 and the pressure rod 304. The sealing plate 302 is installed on the water outlet end of the cathode plate 306 and the anode plate 307 through the pressure plate 303 and the pressure rod 304.

[0024] After entering the reaction tank 301, the circulating cooling water enters the gap between the anode and cathode plates respectively. Under the action of the DC electric field, the cathode area generates high-concentration OH⁻, pH ≥ 10.5, which promotes Ca²⁺ / Mg²⁺ to precipitate in the form of CaCO3 and Mg(OH)2; the anode area electrolysis produces a large amount of active oxidizing substances such as hydroxide ions, negative oxygen ions, chloride ions, ozone, hydrogen peroxide, chlorine and hypochlorous acid, etc., with a concentration of ≥ 5ppm, replacing chemical bactericides. The ions in the circulating cooling water between the anode and cathode plates pass through the selective permeable membrane 3082 of the composite membrane plate 308, forming high-concentration alkaline water on the cathode plate 306 and high-concentration acid washing water on the anode plate 307; the fine scale particles contained in the alkaline water combine with the metal ions with flocculation released by the soluble metal 3083 on the upper part of the composite membrane plate 308, forming large-particle scale particles that are easy to precipitate and enter the sedimentation tank 4 for precipitation, and the effluent of the sedimentation tank 4 returns to the circulating water tank 1.

[0025] The chemical backwash system 5 is bidirectionally connected to the electrochemical reaction tank 3. The water inlet of the chemical backwash system 5 is connected to the anode outlet pipe to store acidic water to clean the cathode of the electrochemical reaction tank 3 to prevent residual scale from covering the cathode plate 306. The acid wash water of the chemical backwash system 5 is sent to the sedimentation tank 4 and is neutralized with the anion water and returned to the circulating water tank 1.

[0026] The control system is used to control the operation of the industrial circulating cooling water treatment system and adjust the electric field strength of the electrochemical reaction tank 3. The control system includes: PLC controller, data acquisition module, data processing module, drive module, communication module, alarm module, power module, communication module, server and database; The data acquisition module is used to collect the operation data of the circulating cooling water treatment system, and collects the analog signal values ​​of the liquid level information of the circulating water pool 1, the voltage and current values ​​of the electrochemical reaction tank 3, and the pH value. For the acquisition of the switch quantity signal, the switch quantity is collected through the optical coupler. The data acquisition module is connected to the data processing module for data processing. The data processing module converts the collected voltage value, current value and conductivity value of the circulating cooling water treatment system and the switch quantity signals of the drain valve, the water inlet valve and the electrolytic power supply into digital voltage signals, which are input into the PLC controller for controlling the operation of the industrial circulating cooling water treatment system; the data processing module is connected to the PLC controller through the serial port, and the PLC controller is connected to the drive module, the communication module and the alarm module; the drive module includes an AC motor drive module, a DC motor drive module, and an electrochemical reaction tank 3 electrolytic power supply, which are respectively connected to control the scale resistance meter 2 and the lifting pump, valve, and the positive and negative plates of the electrochemical reaction tank 3 in the circulating cooling water treatment system. The drive module receives the instructions sent by the PLC controller, controls the DC voltage of the positive and negative plates of the electrochemical reaction tank 3, the current of the lifting pump, and the switch quantity of the drain valve and the water inlet valve, and realizes the automatic operation of the industrial circulating cooling water treatment system. The communication module is connected to the server, the server is connected to the database, and the server and the database are connected to the control interface to realize remote monitoring of the working condition of the circulating cooling water treatment system and remote adjustment.

[0027] Corresponding to the aforementioned application function realization device embodiment, the present application also provides an industrial circulating cooling water treatment method and corresponding embodiments.

[0028] An industrial circulating cooling water treatment method comprises the following steps: S101, after the control system detects that the water volume in the circulating water pool meets the processable water volume, the control system controls the lift pump to transport cooling water to the electrochemical reaction tank; S102, start the scale resistance meter on the cooling water delivery main pipeline, convert electrical energy into magnetic energy through the scale resistance meter, continuously perform electrical-magnetic conversion, form an induction field in the water, prevent ions from forming scale, and slowly remove old scale; When the scale resistance meter is working, due to electromagnetic induction, electric-magnetic conversion is continuously carried out around the pipe, forming an induction field in the water, thereby preventing ions from forming scale. The scale resistance meter does not contact water, is not restricted by pipe materials, does not change the chemical composition, and does not interfere with other electronic equipment. The power supply is AC 220V, and the maximum power does not exceed 100W.

[0029] S103, after the circulating cooling water enters the electrochemical reaction tank, it enters the gap between the anode and cathode plates respectively, and electrolyzes the cooling water under the action of the DC electric field. The control system detects the pH value of the cooling water in the electrochemical reaction tank. After the electrolysis is completed, high-concentration alkaline water is formed on the cathode plate side, and the generated scale particles enter the sedimentation tank with the cationic water for precipitation, and high-concentration acidic water is formed on the anode plate side, and enters the circulating water tank for sterilization operation; Specifically, after the circulating cooling water enters the electrochemical reaction tank, it enters the gap between the anode and cathode plates respectively, and electrolysis of the cooling water is performed under the action of the DC electric field, including: Under the action of the DC electric field, the cooling water undergoes a hydrogen evolution reaction on the cathode region, separating the hydrogen ions in the bicarbonate and the hydrogen ions in the water. The reaction formula is: ; ; ; A large amount of active oxidizing substances, such as hydroxide ions, negative oxygen ions, chloride ions, ozone, hydrogen peroxide, chlorine and hypochlorous acid, are precipitated at the anode. The reaction formula is: ; ; ; ; The ions in the circulating water between the anode and cathode plates pass through the selective permeable membrane at the bottom of the composite membrane plate, forming high-concentration alkaline water in the cathode area and high-concentration acid washing water in the anode area.

[0030] Calcium and magnesium ions combine with negative ions near the cathode to produce scaling products such as calcium carbonate, calcium hydroxide, and magnesium hydroxide, causing scale to precipitate; the strong oxidizing substances produced near the anode kill the bacteria and algae in the circulating cooling water. The large amount of strong oxidizing substances in the anode water can have a very good bactericidal effect on the bacteria and algae in the circulating cooling water, replacing traditional bactericides and saving chemicals.

[0031] With the movement of cooling water, the fine scale particles contained in the alkaline water combine with the metal ions with flocculation effect released by the soluble metal on the upper part of the composite membrane plate to form large scale particles that are easy to precipitate. After the cathode water passes through the sedimentation tank, it returns to the circulating water tank; the flocculation process is that the metal electrode generates cations under the action of the electric field, which includes many physical and chemical phenomena when entering the water body. From the generation of ions to the formation of flocs, there are three consecutive stages: under the action of the electric field, the anode generates electrons to form "micro-flocculants" iron or aluminum hydroxide; suspended particles and colloidal pollutants in the water lose stability under the action of the flocculant; the destabilized pollutant particles and micro-flocculants collide with each other and combine into large flocs visible to the naked eye. Since the product of the electrolytic reaction in the electroflocculation process is only ions, no oxidant or reductant needs to be added, and no or little pollution is generated to the environment. It is an environmentally friendly water treatment technology.

[0032] Anode water is returned to the circulating water pool to achieve environmentally friendly circulating cooling water treatment.

[0033] Specifically, the cooling water is electrolyzed under the action of a DC electric field, and further comprises: The suspended matter in the cooling circulating water passes through the strong acid and strong alkaline environment inside the electrochemical reaction tank alternately, and the surface charge is destroyed and unstable, and it is deposited to the bottom of the reaction chamber and discharged during the flushing process of the chemical backwash system, thereby reducing the suspended matter in the cooling water.

[0034] S104, the water inlet of the chemical backwash system is connected to the anode outlet pipe to store acidic water, clean the cathode of the electrochemical reaction tank, and return it to the circulating water pool after being neutralized with anion water to complete the cooling water treatment.

[0035] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An industrial circulating cooling water treatment system, characterized in that: include: Resistance scale meter, electrochemical descaling system and control system; The scale resistance meter is installed on the outer wall of the cooling water delivery pipeline to inhibit scaling of the pipeline through electromagnetic induction; The electrochemical descaling system comprises an electrochemical reaction tank, a composite membrane plate and a sedimentation tank, which are used to remove calcium and magnesium ions and sterilize and kill algae. The electrochemical reaction tank is connected to a circulating water tank through a lifting pump, a cation outlet pipe of the electrochemical reaction tank is connected to the circulating water tank, and an anion outlet pipe is connected to a sedimentation tank. The sedimentation tank is connected to the circulating water tank and a scale collection tank respectively. The composite membrane plate is installed between the cathode plate and the anode plate of the electrochemical reaction tank. A selective permeable membrane and a soluble metal are arranged on the composite membrane plate. The soluble metal is installed on the upper end of the selective permeable membrane. The metal ions released by the soluble metal have a flocculating effect, which are combined with fine scale particles in the cathode area of ​​the electrochemical reaction tank to form large scale particles, which enter the sedimentation tank with the cathode water. The control system is used to control the operation of the industrial circulating cooling water treatment system and to adjust the electric field intensity of the electrochemical reaction tank.

2. The industrial circulating cooling water treatment system according to claim 1, characterized in that: The control system comprises: PLC controller, data acquisition module, data processing module, drive module, communication module, alarm module, power module, communication module, server and database; The data acquisition module is used to collect the operation data of the circulating cooling water treatment system. The data acquisition module is connected to the data processing module for data processing. The data processing module uses the collected voltage value, current value and conductivity value of the circulating cooling water treatment system as well as the drain valve feedback, the water inlet valve feedback and the switching signal of the electrolysis power supply as input signals, and converts the digital quantity for the operation of the PLC controller; The data processing module is serially connected to the PLC controller, and the PLC controller is connected to the drive module, the communication module and the alarm module; The driving module is connected to control the electrochemical reaction tank, the lifting pump and the valve in the circulating cooling water treatment system. The driving module receives the instructions sent by the PLC controller to control the DC voltage of the positive and negative plates of the electrochemical reaction tank, the current of the lifting pump and the switching value of the drain valve and the water inlet valve; The communication module is connected to the server by wireless communication, the server is connected to the database, and the server and the database are connected to the control interface to achieve remote monitoring of the working status of the circulating cooling water treatment system and remote adjustment.

3. The industrial circulating cooling water treatment system according to claim 1, characterized in that: The electrochemical reaction tank comprises a reaction tank body, a sealing plate, a pressure plate, a pressure rod, a locking nut, a cathode plate, an anode plate and a composite membrane plate; The cathode plate and the anode plate are installed in the reaction tank body at intervals, the composite membrane plate is installed between the cathode plate and the anode plate, the composite membrane plate includes a clip, a selective permeable membrane and a soluble metal, the selective permeable membrane and the soluble metal are installed in the clip, and the soluble metal is installed on the upper end of the selective permeable membrane; The pressure rod is installed on the water outlet end of the reaction tank body through a locking nut, the pressure plate is installed between the sealing plate and the pressure rod, and the sealing plate is installed on the water outlet ends of the cathode plate and the anode plate through the pressure plate and the pressure rod; After entering the reaction tank body, the circulating cooling water enters the gap between the anode and cathode plates respectively. Under the action of the DC electric field, the ions in the circulating cooling water between the anode and cathode plates pass through the left and right sides of the selective permeable membrane of the composite membrane plate to form high-concentration alkaline water on the cathode plate side and high-concentration acid washing water on the anode plate side; the fine scale particles contained in the alkaline water combine with the metal ions with flocculation effect released by the soluble metals on the upper part of the composite membrane plate to generate large-particle scale particles that are easy to precipitate and enter the sedimentation tank for precipitation, and the effluent from the sedimentation tank returns to the circulating water tank.

4. The industrial circulating cooling water treatment system according to claim 2, characterized in that: The cathode plate is a titanium-plated platinum plate, the anode plate is a titanium-based mixed metal plate, and the distance between the cathode plate and the anode plate is ≤10mm; A DC voltage of 10-30V is applied to the cathode plate and the anode plate; The cathode region generates high concentration of OH⁻, pH ≥ 10.5, which promotes the precipitation of Ca²⁺ and Mg²⁺ in the form of CaCO3 and Mg(OH)2; Electrolysis in the anode area produces hydroxide ions, negative oxygen ions, chloride ions, ozone, hydrogen peroxide, chlorine and hypochlorous acid with a concentration of ≥5ppm, which can replace chemical bactericides.

5. The industrial circulating cooling water treatment system according to claim 1, characterized in that: The scale resistance meter is connected to the outer wall of the circulating water tank delivery pipeline, with a frequency of 5-20kHz and a magnetic field strength of ≥500Gauss; When working, it converts electrical energy into magnetic energy, and through electromagnetic induction, it continuously performs electro-magnetic conversion around the main pipeline, forms an induction field in the water, prevents ions from forming scale, and slowly removes old scale.

6. The industrial circulating cooling water treatment system according to claim 1, characterized in that: Also includes: Chemical backwash system; The chemical backwash system is bidirectionally connected to the electrochemical reaction tank. The water inlet of the chemical backwash system is connected to the anode outlet pipe to store acidic water to clean the cathode of the electrochemical reaction tank to prevent residual scale from covering the cathode plate. The acid water of the chemical backwash system is sent to the sedimentation tank and is neutralized with anion water and returned to the circulating water tank.

7. An industrial circulating cooling water treatment method, characterized in that: The following steps are involved: After the control system detects that the water volume in the circulating water pool meets the processable water volume, it controls the lifting pump to transport cooling water to the electrochemical reaction tank; Start the scale resistance instrument on the cooling water delivery main pipeline. The scale resistance instrument converts electrical energy into magnetic energy, continuously performs electrical-magnetic conversion, forms an induction field in the water, prevents ions from forming scale, and slowly removes old scale. After entering the electrochemical reaction tank, the circulating cooling water enters the gap between the anode and cathode plates respectively. Under the action of the DC electric field, the cooling water is electrolyzed. The control system detects the pH value of the cooling water in the electrochemical reaction tank. After the electrolysis is completed, high-concentration alkaline water is formed on the cathode plate side, and the generated scale particles enter the sedimentation tank with the cationic water for precipitation. High-concentration acidic water is formed on the anode plate side and enters the circulating water tank for sterilization operation. The water inlet of the chemical backwash system is connected to the anode outlet pipe to store acidic water, clean the cathode of the electrochemical reaction tank, and return it to the circulating water pool after being neutralized with anionic water to complete the cooling water treatment.

8. The industrial circulating cooling water treatment method according to claim 7, characterized in that: After the circulating cooling water enters the electrochemical reaction tank, it enters the gap between the anode and cathode plates respectively, and electrolyzes the cooling water under the action of the DC electric field, including: Under the action of the DC electric field, the cooling water undergoes a hydrogen evolution reaction on the cathode region, precipitating hydrogen ions in the bicarbonate and hydrogen ions in the water; A large amount of active oxidizing substances, such as hydroxide ions, negative oxygen ions, chloride ions, ozone, hydrogen peroxide, chlorine gas and hypochlorous acid, are precipitated at the anode; The ions in the circulating water between the anode and cathode plates pass through the selective permeable membrane at the bottom of the composite membrane plate, forming high-concentration alkaline water in the cathode area and high-concentration acid washing water in the anode area. Calcium and magnesium ions combine with negative ions near the cathode to produce calcium carbonate, calcium hydroxide, and magnesium hydroxide scaling products, causing scale precipitation; strong oxidizing substances produced near the anode kill bacteria and algae in the circulating cooling water; With the movement of cooling water, the fine scale particles contained in the alkaline water combine with the metal ions with flocculation effect released by the soluble metal on the upper part of the composite membrane plate to form large scale particles that are easy to precipitate. After the cathode water passes through the sedimentation tank, it returns to the circulating water tank; The anode water returns to the circulating water pool to adjust the pH value of the circulating water pool, and achieve the purpose of anti-corrosion, sterilization and algae removal, realizing environmentally friendly circulating cooling water treatment.

9. The industrial circulating cooling water treatment method according to claim 7, characterized in that: The step of electrolyzing cooling water under the action of a DC electric field further comprises: The suspended matter in the cooling circulating water passes through the strong acid and strong alkaline environment inside the electrochemical reaction tank alternately, and the surface charge is destroyed and unstable, and it is deposited to the bottom of the reaction chamber and discharged during the flushing process of the chemical backwash system, thereby reducing the suspended matter in the cooling water.

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