A method and device for multi-stage circulation treatment of cooling water

Abstract

The present application relates to the technical field of cooling water treatment of conveyor belt workshop, and particularly relates to a cooling water multi-stage circulation treatment method and device, which comprises the following steps: firstly, introducing the fouling-containing cooling water discharged from cooling roller into a pre-sedimentation tank, and removing large-particle suspended solids by using the inclined pipe filler at the bottom of the tank; after ion exchange softening, injecting scale and corrosion inhibitors for chemical treatment, and then performing ultrafiltration filtration; the produced water is sent into the cooling roller after cleaning the pipeline by a hydraulic pulse generator, and meanwhile, the scale crystallization is inhibited by a low-frequency electromagnetic coil at the water inlet end of the roller, so that the recycling is realized. The silica gel elastic scale scraping ball reciprocally moves and scrapes the pipe wall in the water supply main pipeline, and the scale scraping ball is recycled by combining the catcher and the ultrasonic cleaning device, so that the pipeline is cleaned automatically and efficiently without frequent manual cleaning, and the labor cost and time cost for cleaning are significantly reduced.

Description

Technical Field

[0001] This invention relates to the field of cooling water treatment technology in conveyor belt workshops, and in particular to a method and apparatus for multi-stage circulation treatment of cooling water. Background Technology

[0002] In the conveyor belt production process, cooling roller cooling is a key process for rapid cooling and shaping, mainly used in the substrate molding and lamination stages of PVC and PU plastic conveyor belts. In the production of PVC or PU conveyor belts, when molten plastic (PVC / PU granules mixed with additives and plasticized by an extruder) is extruded through a die into continuous sheets (as a cover layer or base belt), the high-temperature sheets need to be immediately cooled by cooling rollers.

[0003] The surface of the cooling roller is usually mirror-finished, and the inside is filled with circulating cooling water. When the high-temperature sheet comes into close contact with the cooling roller, the heat is quickly carried away, causing the plastic to solidify and take shape from the molten state, ensuring the uniformity of sheet thickness, surface flatness and dimensional stability.

[0004] When the cooling rollers are cooled, cold water is circulated inside them. When the water is heated, scale is easily formed inside the steel cooling rollers. Long-term use can affect the performance. Scale not only reduces cooling efficiency, but may also block pipes, corrode the rollers, and even affect the forming quality of the conveyor belt.

[0005] Currently, the main method for treating scale is to introduce oxalic acid into the interior of the steel cooling rollers. However, this method has the following drawbacks: On the one hand, oxalic acid is highly corrosive, and precise dosage control is difficult. While removing scale, it may also cause corrosion damage to the metal inner wall of the cooling roller, shortening the service life of the cooling roller and increasing equipment replacement costs.

[0006] On the other hand, if the oxalic acid solution is discharged directly after use, it will pollute the environment, and subsequent treatment will increase the treatment cost and procedures.

[0007] Furthermore, this single chemical cleaning method cannot fundamentally solve the problem of scale buildup during long-term circulating use of cooling water, requiring frequent cleaning and affecting the continuity and stability of production.

[0008] Therefore, designing an efficient cooling water circulation treatment process and device to achieve effective purification and recycling of cooling water in various workshops is of great significance for ensuring safe production, reducing costs, and meeting environmental protection requirements in conveyor belt workshops. Summary of the Invention

[0009] To solve one of the above-mentioned technical problems, the present invention adopts the following technical solution: a multi-stage circulation treatment method for cooling water, comprising the following steps: a. Pretreatment: the scale-containing cooling water discharged from the cooling rollers inside each conveyor belt workshop enters the pre-sedimentation tank of the plant cooling water treatment station through the downstream connected main water supply pipeline. The pre-sedimentation tank utilizes the inclined tube packing at the bottom of the tank and removes large suspended solids such as plastic debris and metal rust slag by gravity sedimentation.

[0010] b. Chemical treatment: During the pipeline transportation of pretreated softened water, a fully mixed scale inhibitor and corrosion inhibitor are injected into the pipeline through an externally configured metering pump; the pipeline water continues to be sent into a vortex reaction tank, where the mixed agents react with tiny calcium and magnesium ions in the water at the bottom of the tank to form flocculent matter; the mixed solution then flows into an inclined plate sedimentation tank, which inhibits scale crystallization and forms a protective film on the inner surface of the pipeline metal.

[0011] c. Precision filtration: A centrifugal pump is used to pump the effluent from the chemically treated sedimentation tank into an ultrafiltration device to trap colloids, microorganisms, and unsettled scale precursors. The produced water then enters a clear water tank for later use.

[0012] d. Pipeline self-cleaning: Before the produced water is sent to the fixed-axis rotating cooling roller through the pipeline, it is first pressurized by the hydraulic pulse generator and then high-pressure pulses are sprayed into the interior of the cooling roller to impact the inner wall of the cooling roller and shake off the initial soft scale.

[0013] e. Non-destructive descaling and circulation of cooling rollers: A low-frequency electromagnetic coil is pre-wound onto the outer wall of the water inlet end of the cooling roller. During the cooling process of the cooling water entering the cooling roller, the low-frequency electromagnetic coil is activated to change the movement trajectory of calcium and magnesium ions and inhibit their crystallization.

[0014] The scale inhibitor uses 5-10 ppm of organophosphonate scale inhibitor, and the corrosion inhibitor uses 2-5 ppm of molybdate corrosion inhibitor.

[0015] Add 5-10 ppm of organophosphonate scale inhibitor and 2-5 ppm of molybdate corrosion inhibitor to the softened water using a metering pump. After mixing, the mixture is sent to a vortex reaction tank for 30 minutes and then flows into an inclined plate sedimentation tank for 1-1.5 hours of sedimentation to achieve an effluent turbidity of <5 NTU.

[0016] The volume of the pre-sedimentation tank is designed to be 2-3 times the maximum hourly drainage volume of the workshop.

[0017] Step a also includes transporting the effluent from the pre-sedimentation tank to an ion exchange tank via a booster pump installed on the pipeline. The tank is filled with strong acid cation exchange resin, and the water hardness is reduced to below 30 ppm by the replacement reaction between Na⁺ and Ca²⁺ and Mg²⁺ in the water, thus completing the softening and hardness reduction treatment.

[0018] The specific steps for softening and reducing the hardness of the effluent from the pre-sedimentation tank are as follows: the effluent from the pre-sedimentation tank is pumped into the ion exchange tank by a booster pump, and the tank is filled with a weakly acidic acrylic cation exchange resin; an adjustable gradient magnetic field is set up in advance on the outside of the ion exchange tank.

[0019] When an adjustable gradient magnetic field is applied outside the ion exchange tank, the water flow generates micro-eddies under the action of the Lorentz force, causing slight disturbances in the resin particles and creating a fluidization-like effect. This disturbance breaks the stagnant boundary layer on the resin surface, accelerating the mass transfer rate of Ca²⁺ and Mg²⁺ from the bulk aqueous solution to the resin surface, while preventing resin particle agglomeration and channeling, ensuring sufficient contact between the resin and the aqueous solution, and improving exchange efficiency.

[0020] The water entering the ion exchange tank undergoes an ion exchange reaction with Ca²⁺ and Mg²⁺ in the water under the action of cation exchange resin. This causes the hardness ions in the water to be captured by the resin and replaced with hydrogen ions, thus softening the water.

[0021] Once the resin is saturated with adsorption, the regeneration process is initiated while ultrasound is simultaneously applied to the inside of the ion exchange tank.

[0022] A 3%-5% HCl solution is introduced as a regener. Under pressure, the regener flows upward from the bottom of the tank and comes into full contact with the resin, thus completing the regeneration of the resin.

[0023] The regenerated resin is discharged and rinsed with clean water in a countercurrent flow before being returned to the ion exchange tank for later use.

[0024] Based on any of the above technical solutions, the following further optimization is made: Step c also includes periodically backwashing the ultrafiltration membrane with air and water, and returning the backwash wastewater to the pre-sedimentation tank under the action of 0.2MPa air pressure and 100L / m²・min water flow rate; at the same time, the water quality is monitored in real time by a conductivity meter, pH meter and hardness meter installed on the clear water tank, and the data is connected to the PLC control system. When the water quality index exceeds the standard, the bypass pipeline is automatically started for secondary softening.

[0025] Based on any of the above technical solutions, the following further optimization is made: the pore size of the ultrafiltration membrane of the ultrafiltration device is 0.01μm, and the ultrafiltration membrane is periodically backwashed with air and water at a pressure of 0.2MPa and a water flow rate of 100L / m²・min.

[0026] Based on any of the above technical solutions, a further optimization is made as follows: Step d also includes placing several food-grade silicone elastic scraping balls with a diameter 3-5mm larger than the inner diameter of the water supply main pipe. The surface of the balls is provided with raised textures. The silicone elastic scraping balls scrape the pipe wall and complete the cleaning of the pipe wall by reciprocating with the water flow.

[0027] Based on any of the above technical solutions, the following further optimization is made: Step e also includes making the water flow rotate at a high speed of ≥2m / s through the spiral guide grooves set on the inner side wall of the cooling roller, using centrifugal force to throw the suspended scale particles toward the outlet of the cooling roller, and opening the drain valve at the outlet for 30 seconds each shift for periodic discharge; the scale-containing cooling water that has completed the cooling task is returned to the pre-sedimentation tank through the main water supply pipeline to form a multi-stage circulation treatment of cooling water.

[0028] Based on any of the above technical solutions, a further optimization is made by winding a low-frequency electromagnetic coil on the outer wall of the water inlet end of the cooling roller. The coil has an operating frequency of 20-50kHz and a magnetic field strength of 0.1-0.3T.

[0029] The present invention also provides a multi-stage cooling water circulation treatment device, which is used to complete the above-mentioned multi-stage cooling water circulation treatment method. The device includes a pre-sedimentation tank, an ion exchange tank, a vortex reaction tank, an inclined plate sedimentation tank, an ultrafiltration device, and a clear water tank connected in sequence by pipelines; the pre-sedimentation tank is located inside the plant's cooling water treatment station.

[0030] The clear water tank is connected to the inlet of each cooling roller through the main water supply pipeline. A hydraulic pulse generator is installed on the pipeline at the inlet end of the cooling roller. The nozzle of the hydraulic pulse generator extends into the inlet at the end of the cooling roller and is used to spray high-pressure pulsed water into the interior of the cooling roller.

[0031] Both ends of the cooling roller are inserted into bearing seats at corresponding positions through the central tubes at their respective ends, and the cooling roller is driven by the conveyor belt to be cooled.

[0032] A silicone elastic scraper ball is placed inside the main water supply pipe. A catcher for capturing the silicone elastic scraper ball is installed at the downstream end of the straight section of the main water supply pipe. A guide is installed at the upstream end of the straight section of the main water supply pipe. The guide is used to send the cleaned silicone elastic scraper ball into the upstream internal pipe of the straight section of the main water supply pipe.

[0033] Based on any of the above technical solutions, a further optimization is made as follows: the trap includes an arc-shaped collection pipe section integrally formed and installed at the downstream end of the straight section of the main water supply pipeline. The arc-shaped collection pipe section has a collection channel for the silicone elastic scraper ball to enter. A guide port is provided at the top of the collection channel and at the pipe of the main water supply pipeline. A blocking net is fixed on the inner wall of the main water supply pipeline downstream of the guide port. Quick-release end caps are screwed on the front and rear sides of the end of the arc-shaped collection pipe section. An ultrasonic vibrator is installed on one of the quick-release end caps. The ultrasonic vibrator is used to ultrasonically clean the water and silicone elastic scraper ball accumulated inside the collection channel. After the silicone elastic scraper ball is cleaned, the silicone elastic scraper ball is removed and the residual water is discharged by opening the quick-release end cap. The cleaned silicone elastic scraper ball is then reintroduced into the upstream pipe of the main water supply pipeline through the guide.

[0034] Based on any of the above technical solutions, a further optimization is made as follows: the guide includes a guide pipe integrally formed on the upstream pipe of the main water supply pipe, the bottom of the guide pipe is connected to the interior of the upstream pipe of the main water supply pipe, and a sealing end cap is installed on the top of the guide pipe. When the sealing end cap is open, the silicone elastic scraper ball enters the main water supply pipe through the guide pipe.

[0035] Based on any of the above technical solutions, a further optimization is made as follows: a low-frequency electromagnetic coil is provided on the outer wall of the water inlet end of the cooling roller, and several spiral guide grooves are provided along the circumference of the inner cavity side wall of the cooling roller. Each spiral guide groove extends to both ends of the cooling roller, and the water outlet of the cooling roller is connected to the pre-sedimentation tank through the main water supply pipeline.

[0036] Based on any of the above technical solutions, a further optimization is made: when the silicone elastic scraper ball reaches the capture position of the corresponding pipe, it is collected by the capture device, and after being ultrasonically cleaned inside, it is sent back into the corresponding pipe for recycling, thereby realizing dynamic self-cleaning inside the pipe.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention utilizes a silicone elastic scraper ball that reciprocates with the water flow within the main water supply pipe to scrape the pipe wall. Combined with a trap and an ultrasonic cleaning device, the scraper ball can be recycled, eliminating the need for frequent manual pipe cleaning. This significantly reduces manual cleaning costs and time, achieving efficient and automated pipe cleaning.

[0038] 2. This invention utilizes ultrasonic cleaning scraper balls to deeply remove surface dirt, ensuring the cleaning performance of the scraper balls. Combined with a circulating usage mode, it can continuously clean the inner wall of the pipe, effectively preventing dirt accumulation from affecting the water conveyance capacity of the pipe, ensuring the stability of equipment operation, and improving the durability of the cleaning effect.

[0039] 3. This invention uses recyclable silicone elastic scraper balls, which reduces waste of cleaning consumables and eliminates the need for large amounts of chemical agents and additional energy. It not only conforms to the concept of environmental protection, but also reduces energy consumption and environmental pollution during the cleaning process, achieving the dual benefits of environmental protection and energy saving.

[0040] 4. The trap and guide of the present invention have a simple structural design, are easy to connect to the main water supply pipeline, operate stably, and have a mature and reliable ultrasonic vibrator cleaning method, which greatly reduces the probability of equipment failure, facilitates maintenance and management, and reduces the difficulty and cost of equipment maintenance.

[0041] 5. The silicone elastic scraper ball in this invention can monitor pipe abnormalities by moving inside the pipe. By monitoring its motion parameters through sensors, it can detect problems such as local deformation and cracks in the pipe in a timely manner, and realize early warning of faults. At the same time, the vibration and sound waves generated by ultrasonic cleaning can loosen and clean the small blockages in the pipe, and the wet state of the scraper ball surface can temporarily lubricate the inner wall of the pipe, reduce water flow resistance, reduce power equipment energy consumption, and improve the overall performance of the system. Attached Figure Description

[0042] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, the elements or components are not necessarily drawn to scale.

[0043] Figure 1 This is a schematic diagram of the structure of the multi-stage cooling water circulation treatment device of the present invention.

[0044] Figure 2 This is a schematic diagram of the internal structure of the catcher of the present invention.

[0045] Figure 3 This is a partially enlarged structural diagram of the trap of the present invention.

[0046] Figure 4 This is a schematic diagram of the internal structure of the guide of the present invention.

[0047] Figure 5 This is a schematic diagram of the internal structure of the cooling roller of the present invention.

[0048] Figure 6 This is a detailed schematic diagram showing the installation state of the hydraulic pulse generator and cooling roller of the present invention.

[0049] In the diagram, 1. Pre-sedimentation tank; 2. Main water supply pipeline; 3. Metering pump; 4. Vortex reaction tank; 5. Inclined plate sedimentation tank; 6. Centrifugal pump; 7. Ultrafiltration equipment; 8. Clear water tank; 9. Hydraulic pulse generator; 10. Cooling roller; 11. Low-frequency electromagnetic coil; 12. Lift pump; 13. Ion exchange tank; 14. Gradient magnetic field; 15. Silica gel elastic scraper ball; 16. Spiral guide channel; 17. Drain valve; 18. Snap trap; 19. Guide; 20. Arc-shaped collection pipe section; 21. Collection channel; 22. Guide port; 23. Barrier net; 24. Quick-release end cap; 25. Ultrasonic vibrator; 26. Guide pipe; 27. Sealing end cap; 28. Bearing seat. Detailed Implementation

[0050] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore merely examples and should not be used to limit the scope of protection of the present invention. The specific structure of the present invention is as follows: Figures 1-6 As shown in the image.

[0051] Example 1: A multi-stage circulating treatment method for cooling water includes the following steps: a. Pretreatment: The scale-containing cooling water discharged from the cooling rollers 10 inside each conveyor belt workshop enters the pre-sedimentation tank 1 of the cooling water treatment station in the plant area through the downstream connected main water supply pipeline 2. The pre-sedimentation tank 1 uses the inclined tube packing at the bottom of the tank to remove plastic debris, metal rust and large suspended particles by gravity sedimentation.

[0052] After being discharged from the cooling rollers 10 inside the conveyor belt workshop, the scale-laden cooling water is transported by the main water supply pipeline 2 into the pre-sedimentation tank 1 of the plant's cooling water treatment station. The inclined tube packing at the bottom of the pre-sedimentation tank 1 creates a larger contact area and a favorable settling environment for the suspended solids in the cooling water to settle. Under the action of gravity, large suspended solids such as denser plastic fragments and metal rust overcome the resistance of the water flow and gradually sink to the bottom of the tank, thus achieving initial separation from the cooling water.

[0053] The installation of inclined tube packing at the bottom of the tank significantly increases the contact probability between suspended solids and the packing material, accelerating the settling speed of large suspended solids. Compared with ordinary sedimentation tanks, it can remove large particulate impurities from cooling water more efficiently, quickly reduce the turbidity of cooling water, provide cleaner cooling water for subsequent treatment processes, and reduce the load and processing pressure of subsequent treatment equipment.

[0054] The pre-sedimentation tank 1 is designed with a volume 2-3 times the maximum hourly drainage volume of the workshop. This design gives the pre-sedimentation tank 1 a strong buffering capacity. When the workshop drainage experiences a sudden increase in flow due to production fluctuations, the pre-sedimentation tank 1 can accommodate cooling water exceeding the normal flow rate, preventing the cooling water from directly impacting subsequent treatment equipment and ensuring the stability and continuity of the entire cooling water treatment system.

[0055] b. Chemical treatment: During the pipeline transportation of pretreated softened water, a fully mixed scale inhibitor and corrosion inhibitor are injected into the pipeline through an externally configured metering pump 3; the pipeline water continues to be sent into the vortex reaction tank 4, where the mixed agents react with tiny calcium and magnesium ions in the water at the bottom of the tank to form flocculent matter; the mixed solution then flows into the inclined plate sedimentation tank 5, which inhibits scale crystallization and forms a protective film on the inner surface of the pipeline metal.

[0056] During the pipeline transportation of pretreated softened water, an externally configured metering pump 3 precisely controls and injects a fully mixed scale inhibitor and corrosion inhibitor into the pipeline. Subsequently, the water containing the agents flows into a vortex reaction tank 4. Utilizing the special structural design of the bottom of the vortex reaction tank 4, the mixed agents fully contact and chemically react with the tiny calcium and magnesium ions in the water, causing the calcium and magnesium ions to combine with the agents to form flocculent matter. Next, the mixture flows into an inclined plate sedimentation tank 5. In the inclined plate sedimentation tank 5, the scale inhibitor continues to work to inhibit scale crystallization, while the corrosion inhibitor undergoes adsorption or chemical reaction on the inner surface of the pipeline metal, forming a protective film that isolates the metal from contact with water and corrosive substances in the water.

[0057] Metering pump 3 can precisely control the injection amount of scale inhibitor and corrosion inhibitor according to the actual water volume and quality, avoiding waste or insufficient addition of agents and ensuring the economy and effectiveness of agent use. The vortex reaction tank 4, through its special bottom structure, promotes the full reaction of agents with calcium and magnesium ions, improving reaction efficiency. Compared with ordinary reaction tanks, it can convert calcium and magnesium ions in the water into flocculent matter more quickly and thoroughly, reducing the difficulty of subsequent treatment.

[0058] Within the inclined plate sedimentation tank 5, scale inhibitors and corrosion inhibitors function by inhibiting scale formation and protecting metal pipes, respectively, forming a dual protection mechanism. The scale inhibitors suppress scale crystallization, preventing scale from depositing on pipe and equipment surfaces and affecting heat transfer and water flow efficiency; the protective film formed by the corrosion inhibitors effectively slows down the corrosion rate of the pipe metal, extending the service life of pipes and related equipment and reducing equipment maintenance and replacement costs.

[0059] Specifically, the main function of the chemical treatment step is to further purify the water and protect the pipeline equipment. By removing tiny calcium and magnesium ions from the water, it inhibits scale formation, reduces scale deposition on the surfaces of cooling system pipes and equipment, and ensures the heat transfer efficiency and smooth water flow of the cooling system. Simultaneously, it forms a protective film on the inner surface of the pipe metal, preventing corrosion from dissolved oxygen, acids, and alkalis in the water, ensuring the stable operation of the entire cooling water circulation system, and reducing system failures and downtime caused by pipe corrosion and scale problems.

[0060] c. Precision filtration: Centrifugal pump 6 is used to pump the effluent from the chemically treated sedimentation tank into the ultrafiltration equipment 7 to intercept colloids, microorganisms and unsettled scale precursors. The produced water enters the clear water tank 8 for later use.

[0061] The effluent from the chemically treated sedimentation tank is pumped into the ultrafiltration unit 7 via a pipeline by a centrifugal pump 6. The ultrafiltration unit 7 is equipped with an ultrafiltration membrane with a specific pore size (e.g., 0.01 μm), and its separation principle is based on the sieving effect.

[0062] When water flows through the ultrafiltration membrane, particles larger than the membrane pore size, such as colloids, microorganisms, and unsettled scale precursors, are trapped and blocked by the membrane. Water molecules and smaller molecules, however, can pass through smoothly, becoming the treated water that enters the clear water tank 8 for later use. The core function of the precision filtration process is to deeply purify the chemically treated water, further improving its quality. By trapping colloids, microorganisms, and unsettled scale precursors, the impurity content in the water is reduced, achieving a higher standard of cleanliness and purity. This provides high-quality cooling water for subsequent equipment such as the cooling roller 10, ensuring efficient operation of the cooling system and improving the stability of the production process and product quality.

[0063] d. Pipeline self-cleaning: Before the produced water is sent to the fixed-axis rotating cooling roller 10 through the pipeline, it is first pressurized by the hydraulic pulse generator 9 and then high-pressure pulses are sprayed into the interior of the cooling roller 10 to impact the inner wall of the cooling roller 10 and shake off the initial soft scale.

[0064] The produced water flowing from the clear water tank 8 enters the hydraulic pulse generator 9 before being sent to the fixed-axis rotating cooling roller 10. The hydraulic pulse generator 9 pressurizes the water flow through a specific hydraulic system, forming high-energy, high-pressure pulsed water. This high-pressure pulsed water is sprayed into the interior of the cooling roller 10 through pipes. Because the cooling roller 10 is in a fixed-axis rotating state, the high-pressure pulsed water impacts the inner wall of the cooling roller 10 at high speed. Under the powerful impact, the initial soft deposits adhering to the inner wall of the cooling roller 10 cannot withstand the pressure and detach from the wall, thus cleaning the inner wall of the cooling roller 10.

[0065] Utilizing the powerful impact of high-pressure pulsed water, it can quickly and effectively shake off the initial soft scale on the inner wall of the cooling roller 10. Compared with traditional manual cleaning or simple water rinsing, it has higher cleaning efficiency and more significant cleaning effect, and can deeply clean areas that are difficult for manuals to reach.

[0066] The main function of the pipeline self-cleaning step is to clean the product water delivery pipeline and the inner wall of the cooling roller 10 before it enters the cooling roller 10, preventing dirt from accumulating in the pipeline and the inner wall of the cooling roller 10. By removing initial soft scale, it maintains the good heat exchange performance of the cooling roller 10, ensuring that the cooling water can effectively remove heat, maintaining the efficient operation of the cooling system, providing stable cooling for the production process, and guaranteeing product quality and production efficiency.

[0067] e. Non-destructive descaling and circulation of cooling roller 10: A low-frequency electromagnetic coil 11 is pre-wound on the outer wall of the water inlet end of the cooling roller 10. During the cooling process of cooling water entering the interior of the cooling roller 10, the low-frequency electromagnetic coil 11 is activated to change the movement trajectory of calcium and magnesium ions and inhibit their crystallization.

[0068] Before the cooling roller 10 is put into use, a low-frequency electromagnetic coil 11 is wound around the outer wall of its water inlet end. When the cooling water enters the cooling roller 10 and begins the cooling process, the low-frequency electromagnetic coil 11 is activated to generate a magnetic field of a specific frequency (20-50kHz) and intensity (0.1-0.3T). Under this magnetic field environment, calcium and magnesium ions in the cooling water are subjected to the Lorentz force, and their original trajectory is changed. Calcium and magnesium ions cannot aggregate to form scale according to the conventional crystallization mode, thereby inhibiting the scale crystallization process and preventing scale from adhering and growing on the inner wall of the cooling roller 10.

[0069] By inhibiting the crystallization of calcium and magnesium ions through electromagnetic action, descaling methods that may damage the inner wall of the cooling roller 10, such as chemical agents or mechanical scraping, are eliminated. This effectively prevents scale formation while ensuring the integrity of the cooling roller 10, extending the service life of the equipment, and reducing the cost of repair or replacement due to physical or chemical damage.

[0070] The low-frequency electromagnetic coil 11 can work continuously during the continuous circulation of cooling water, continuously intervening in the movement of calcium and magnesium ions. Compared with other staged or intermittent descaling methods, it can more stably inhibit scale formation, ensure that the cooling roller 10 is in good working condition for a long time, and guarantee the stable operation of the cooling system.

[0071] The core function of the non-destructive descaling and circulation steps of the cooling roller 10 is to prevent scale buildup on the inner wall of the cooling roller 10, ensuring the efficient operation of the cooling system. By inhibiting the crystallization of calcium and magnesium ions, the cooling roller 10 maintains good heat exchange performance, allowing the cooling water to fully exert its cooling effect, promptly removing the heat generated during production, maintaining the normal operating temperature of the production equipment, ensuring the continuity and stability of the production process, and improving product quality and production efficiency.

[0072] The scale inhibitor uses 5-10 ppm of organophosphonate scale inhibitor, and the corrosion inhibitor uses 2-5 ppm of molybdate corrosion inhibitor.

[0073] Add 5-10 ppm of organophosphonate scale inhibitor and 2-5 ppm of molybdate corrosion inhibitor to the softened water via metering pump 3. After mixing, the mixture is sent to vortex reaction tank 4 for reaction for 30 minutes, and then flows into inclined plate sedimentation tank 5 for sedimentation for 1-1.5 hours to make the turbidity of the effluent <5 NTU.

[0074] The volume of the pre-sedimentation tank 1 is designed to be 2-3 times the maximum hourly drainage volume of the workshop.

[0075] Step a also includes transporting the effluent from the pre-sedimentation tank 1 to the ion exchange tank 13 via a booster pump 12 configured on the pipeline. The tank is filled with strong acid cation exchange resin, and the water hardness is reduced to below 30 ppm by the replacement reaction of Na⁺ with Ca²⁺ and Mg²⁺ in the water, thus completing the softening and hardness reduction treatment.

[0076] After preliminary sedimentation in the pre-sedimentation tank 1, the effluent is pumped to the ion exchange tank 13 by a booster pump 12 connected to the pipeline. The ion exchange tank 13 is filled with strong acid cation exchange resin, which contains a large number of exchangeable ionic groups. When water containing hardness ions such as Ca²⁺ and Mg²⁺ flows through the resin, the Na⁺ in the resin undergoes an ion exchange reaction with the Ca²⁺ and Mg²⁺ in the water. According to the chemical equilibrium principle of ion exchange, the hardness ions such as Ca²⁺ and Mg²⁺ are adsorbed and fixed by the resin, while the Na⁺ in the resin is replaced into the water, thereby reducing the water hardness to below 30 ppm, achieving the purpose of softening and reducing hardness.

[0077] The ion exchange process is based on mature chemical reaction principles. As long as the resin performance is stable and the operating conditions are suitable, the softening and hardening treatment can be carried out continuously and stably. At the same time, by rationally designing the size of the ion exchange tank 13 and the resin filling amount, it can adapt to the effluent of the pre-sedimentation tank 1 with different flow rates and water qualities, ensuring the reliability of the entire softening and hardening process.

[0078] Once the resin reaches saturation due to the adsorption of Ca²⁺ and Mg²⁺, its exchange capacity can be restored through a specific regeneration process. A 3%-5% HCl solution is used as the regenerator, flowing upwards from the bottom of the tank under pressure to fully contact the resin, displacing the adsorbed Ca²⁺ and Mg²⁺. This allows the regenerated resin to be reused, reducing operating costs.

[0079] The specific steps for softening and reducing the hardness of the effluent from the pre-sedimentation tank 1 are as follows: the effluent from the pre-sedimentation tank 1 is pumped into the ion exchange tank 13 by the booster pump 12, and the tank is filled with a weakly acidic acrylic cation exchange resin; an adjustable gradient magnetic field 14 is set in advance on the outside of the ion exchange tank 13.

[0080] When an adjustable gradient magnetic field 14 is applied outside the ion exchange tank 13, the water flow generates micro-eddies under the action of the Lorentz force, causing slight disturbance to the resin particles and creating a fluidization-like effect. This disturbance breaks the stagnant boundary layer on the resin surface, accelerates the mass transfer rate of Ca²⁺ and Mg²⁺ from the bulk aqueous solution to the resin surface, and prevents resin particle agglomeration and channeling, ensuring sufficient contact between the resin and the aqueous solution and improving the exchange efficiency.

[0081] The water entering the ion exchange tank 13 undergoes an ion exchange reaction with Ca²⁺ and Mg²⁺ in the water under the action of cation exchange resin. This causes the hardness ions in the water to be captured by the resin and replaced with hydrogen ions, thus achieving water softening.

[0082] Once the resin is saturated with adsorption, the regeneration process is initiated while ultrasound is simultaneously applied to the inside of the ion exchange tank 13.

[0083] A 3%-5% HCl solution is introduced as a regener. Under pressure, the regener flows upward from the bottom of the tank and comes into full contact with the resin, thus completing the regeneration of the resin.

[0084] The regenerated resin is discharged outwards and rinsed with clean water in a countercurrent flow before being returned to ion exchange tank 13 for later use.

[0085] Based on any of the above technical solutions, the following further optimization is made: Step c also includes periodically backwashing the ultrafiltration membrane with air and water, and returning the backwash wastewater to the pre-sedimentation tank 1 under the action of 0.2MPa air pressure and 100L / m²・min water flow rate; at the same time, the water quality is monitored in real time by the conductivity meter, pH meter and hardness meter installed on the clear water tank 8, and the data is connected to the PLC control system. When the water quality index exceeds the standard, the bypass pipeline is automatically started for secondary softening.

[0086] Based on any of the above technical solutions, the following further optimization is made: the pore size of the ultrafiltration membrane of the ultrafiltration device 7 is 0.01μm, and the ultrafiltration membrane is periodically backwashed with air and water at a pressure of 0.2MPa and a water flow rate of 100L / m²・min.

[0087] In the precision filtration process, during long-term operation, the surface and pores of the ultrafiltration membrane gradually trap and accumulate impurities such as colloids, microorganisms, and unsettled scale precursors, leading to a decline in filtration performance. Regular air-water backwashing of the ultrafiltration membrane is performed. Through a specific control system, compressed air and water flow in opposite directions through the ultrafiltration membrane at a pressure of 0.2 MPa and a water flow rate of 100 L / m²·min. The bursting of air bubbles generated by the compressed air and the scouring effect of the water flow effectively remove impurities from the surface and pores of the ultrafiltration membrane, washing them off to form backwash wastewater. This backwash wastewater is then returned to the pre-sedimentation tank 1 for further treatment.

[0088] Meanwhile, the conductivity meter, pH meter, and hardness meter installed on the clear water tank 8 monitor the water quality indicators such as conductivity, pH, and hardness in real time, and transmit the monitoring data to the PLC control system in real time. The PLC control system analyzes and processes the data, and when the water quality indicators exceed the preset standards, it automatically starts the bypass pipeline to introduce the water in the clear water tank 8 back into the ion exchange tank 13 and other equipment for secondary softening treatment to ensure that the water quality meets the requirements.

[0089] Based on any of the above technical solutions, a further optimization is made as follows: Step d also includes placing several food-grade silicone elastic scraping balls 15 with a diameter 3-5mm larger than the inner diameter of the water supply main pipe 2. The surface of the balls is provided with raised textures. The silicone elastic scraping balls 15 scrape the pipe wall and complete the cleaning of the pipe wall by reciprocating with the water flow.

[0090] The raised textures on the surface of the sphere increase friction and contact area with the pipe wall. Because the diameter of the scraper ball is slightly larger than the inner diameter of the pipe, it adheres tightly to the inner wall of the main water supply pipe 2 under the influence of water flow. As the water flow propels the scraper ball back and forth within the pipe, its elasticity and raised textures scrape away the dirt adhering to the pipe wall. With continuous water flow and the reciprocating motion of the scraper ball, the dirt on the inner wall of the pipe is gradually removed, thus achieving pipe wall cleaning.

[0091] The silicone elastic scraper ball 15 fits tightly against the pipe wall and has raised textures on its surface, which can effectively scrape off various kinds of dirt on the pipe wall. Compared with simply relying on water flow to rinse, the cleaning effect is more significant and can remove stubborn dirt that is difficult to rinse off with water.

[0092] The elastic silicone scraper ball 15 is made of flexible material, allowing it to adapt to water supply main pipes 2 with different diameters and degrees of curvature. Whether the pipe is straight or curved, the scraper ball can pass smoothly under the propulsion of water flow and clean the pipe wall, making it widely applicable.

[0093] The silicone elastic scraper ball 15 scrapes the pipe wall with the reciprocating motion of the water flow, removes dirt in the pipe in time, keeps the inner wall of the pipe clean, ensures the smooth flow of cooling water in the pipe, avoids problems such as increased water flow resistance and reduced flow due to pipe scaling, and also reduces the risk of corrosion caused by pipe scaling, extends the service life of the main water supply pipe 2, and ensures the stable operation of the entire cooling water circulation system.

[0094] Based on any of the above technical solutions, the following further optimization is made: Step e also includes making the water flow rotate at a high speed of ≥2m / s through the spiral guide grooves 16 set on the inner side wall of the cooling roller 10, using centrifugal force to throw the suspended scale particles toward the outlet of the cooling roller 10, and opening the drain valve at the outlet for 1730 seconds each shift for periodic discharge; the scale-containing cooling water that has completed the cooling task is returned to the pre-sedimentation tank 1 through the main water supply pipeline 2 to form a multi-stage circulation treatment of cooling water.

[0095] The spiral guide groove 16 provided on the inner wall of the cooling roller 10 changes the flow path of the cooling water inside the roller. When the cooling water enters the cooling roller 10, it is forced to move along a spiral trajectory under the guidance of the spiral guide groove 16, thereby gaining tangential velocity. Because the scale particles suspended in the water have a certain mass, they are thrown towards the inner wall of the cooling roller 10 under the centrifugal force generated by the high-speed rotation. Since the outlet of the cooling roller 10 is located relatively far from the center of rotation, under the continuous action of centrifugal force, the suspended scale particles gradually move and accumulate towards the outlet.

[0096] Each shift, the drain valve at the outlet is opened for 1730 seconds, using the pressure and gravity of the water flow to discharge the scale particles accumulated near the outlet. After completing the cooling task, the scale-laden cooling water flows back into the pre-sedimentation tank 1 through the main water supply pipeline 2, starting a new round of pretreatment, chemical treatment, and other processes, forming a multi-stage circulation treatment of the cooling water.

[0097] The spiral guide channel 16 guides the water flow at high speed to generate centrifugal force, actively separating and discharging suspended scale particles, reducing scale adhesion on the inner wall of the cooling roller 10, maintaining good heat exchange efficiency, and ensuring cooling effect. At the same time, the circulation treatment of scale-containing cooling water realizes the reuse of water resources, reduces the company's production costs, and improves the economic and environmental benefits of the entire multi-stage cooling water circulation treatment system.

[0098] Based on any of the above technical solutions, a further optimization is made by winding a low-frequency electromagnetic coil 11 on the outer wall of the water inlet end of the cooling roller 10. The coil has a working frequency of 20-50kHz and a magnetic field strength of 0.1-0.3T.

[0099] A low-frequency electromagnetic coil 11 is wound around the outer wall of the water inlet end of the cooling roller 10. When current is applied, the coil generates a low-frequency magnetic field with a frequency of 20-50kHz and a magnetic field strength of 0.1-0.3T. During the cooling process of cooling water entering the cooling roller 10, the low-frequency electromagnetic coil 11 is activated. The calcium and magnesium ions in the cooling water are subjected to the Lorentz force, which changes their trajectory. This change in trajectory interferes with the crystallization process of calcium and magnesium ions, making it difficult for them to form scale. At the same time, the spiral guide groove 16 on the inner wall of the cooling roller 10 causes the water flow to rotate at high speed. Using centrifugal force, the existing suspended scale particles are thrown towards the water outlet of the cooling roller 10. The two work together to ensure the cleanliness of the cooling roller 10 by both inhibiting scale formation and removing existing scale.

[0100] The low-frequency electromagnetic coil 11 inhibits scale formation at its source, while the spiral guide channel 16 physically separates and discharges existing suspended scale particles. The combination of these two technologies forms a dual descaling system, from prevention to removal. Compared to a single descaling method, the descaling effect is more significant and comprehensive, effectively maintaining the cleanliness of the cooling roller 10 and ensuring cooling performance. The low-frequency electromagnetic coil 11 and the spiral guide channel 16 are designed to work in tandem, without interference and with mutual synergy. The magnetic field of the electromagnetic coil does not affect the centrifugal force generated by the spiral guide channel 16 in guiding water flow to descaling. Together, they improve the efficiency of the entire cooling roller 10 descaling system and reduce the risk of equipment failure due to scale buildup.

[0101] Example 2: Compared with Example 1, this example also includes the following technical features: The present invention also provides a multi-stage cooling water circulation treatment device, which is used to complete the above-mentioned multi-stage cooling water circulation treatment method. The device includes a pre-sedimentation tank 1, an ion exchange tank 13, a vortex reaction tank 4, an inclined plate sedimentation tank 5, an ultrafiltration device 7, and a clear water tank 8 connected in sequence by pipelines; the pre-sedimentation tank 1 is located inside the plant cooling water treatment station.

[0102] The clear water tank 8 is connected to the water inlet of each cooling roller 10 through the main water supply pipe 2. A hydraulic pulse generator 9 is installed on the pipe at the water inlet end of the cooling roller 10. The nozzle of the hydraulic pulse generator 9 extends into the water inlet at the end of the cooling roller 10 and is used to spray high-pressure pulsed water into the interior of the cooling roller 10.

[0103] Both ends of the cooling roller 10 are inserted into the bearing seat 28 at the corresponding position through the central tube at their respective ends. The cooling roller 10 is driven by the conveyor belt to be cooled.

[0104] A silicone elastic scraper ball 15 is placed inside the main water supply pipe 2. A catcher 18 for catching the silicone elastic scraper ball 15 is installed at the downstream end of the straight pipe section of the main water supply pipe 2. A guide 19 is installed at the upstream end of the straight pipe section of the main water supply pipe 2. The guide 19 is used to send the cleaned silicone elastic scraper ball 15 into the upstream internal pipe of the straight pipe section of the main water supply pipe 2.

[0105] The scale-laden cooling water discharged from the cooling rollers 10 in the conveyor belt workshop first flows into the pre-sedimentation tank 1 located inside the plant's cooling water treatment station. The pre-sedimentation tank 1 utilizes inclined tube packing at the bottom to separate large suspended particles such as plastic debris and metal rust through gravity sedimentation, thus initially purifying the cooling water. The effluent from the pre-sedimentation tank 1 is then pumped by the lift pump 12 into the ion exchange tank 13. Inside the tank, a strong acid cation exchange resin replaces hardness ions such as Ca²⁺ and Mg²⁺ in the water through an ion exchange reaction, reducing the water hardness. During pipeline transportation, the softened water is injected with scale inhibitors and corrosion inhibitors by the metering pump 3, and then enters the vortex reaction tank 4. The agents react with tiny calcium and magnesium ions in the water to form flocculent matter. The mixture then flows into the inclined plate sedimentation tank 5, where scale crystallization is inhibited and a protective film is formed on the inner surface of the pipe metal.

[0106] After chemical treatment, the water is pumped into the ultrafiltration unit 7 by centrifugal pump 6. The ultrafiltration membrane traps colloids, microorganisms, and unsettled scale precursors, and the produced water enters the clear water tank 8. The water in the clear water tank 8 is sent to the cooling roller 10 through the main water supply pipe 2. Before entering the cooling roller 10, the hydraulic pulse generator 9 pressurizes the water flow into a high-pressure pulsed liquid, which is sprayed into the interior of the cooling roller 10, impacting the inner wall and shaking off the initial soft scale. The cooling roller 10 is driven by the conveyor belt to be cooled. The outer wall of its inlet end is wound with a low-frequency electromagnetic coil 11, which changes the movement trajectory of calcium and magnesium ions during operation to inhibit scale crystallization. The spiral guide groove 16 on the inner wall makes the water flow rotate at high speed, using centrifugal force to throw the suspended scale particles to the outlet end for discharge. The silicone elastic scraper ball 15 in the main water supply pipe 2 moves back and forth with the water flow, scraping the pipe wall and cleaning the pipe. When it reaches the downstream end, it is collected by the capture device 18, and after ultrasonic cleaning, it is sent back to the upstream pipe for recycling by the guide device 19.

[0107] The various components of the device are connected in an orderly manner through pipelines to form a complete processing chain. From cooling water collection, pretreatment, chemical treatment, and precision filtration to cooling use and cleaning maintenance, it realizes the integration of multi-stage circulation treatment of cooling water. The processing flow is continuous and efficient, reducing losses and pollution risks in intermediate links.

[0108] The hydraulic pulse generator 9 cleans the inner wall of the cooling roller 10, the silicone elastic scraper ball 15 cleans the main water supply pipe 2, and the low-frequency electromagnetic coil 11 and the spiral guide groove 16 work together to prevent scale buildup on the cooling roller 10. Multiple cleaning methods work together to ensure the cleanliness of the device's interior, extend the equipment's service life, and reduce maintenance costs.

[0109] Based on any of the above technical solutions, a further optimization is made as follows: the trap 18 includes an arc-shaped collection pipe section 20 integrally formed and installed at the downstream end of the straight pipe section of the main water supply pipe 2. The arc-shaped collection pipe section 20 has a collection channel 21 inside for the silicone elastic scraper ball 15 to enter. A guide port 22 is provided at the top of the collection channel 21 where it meets the main water supply pipe 2. A blocking net 23 is fixed on the inner wall of the main water supply pipe 2 downstream of the guide port 22. Quick-release end caps 24 are screwed onto the front and rear sides of the end of pipe section 20, respectively. An ultrasonic vibrator 25 is installed on one of the quick-release end caps 24. The ultrasonic vibrator 25 is used to ultrasonically clean the water and silicone elastic scraper ball 15 accumulated inside the collection channel 21. After the silicone elastic scraper ball 15 is cleaned, the silicone elastic scraper ball 15 is removed and the residual water is discharged by opening the quick-release end cap 24. The cleaned silicone elastic scraper ball 15 is then sent back into the upstream pipe of the main water supply pipe 2 through the guide 19.

[0110] The trap 18 is integrally molded and installed at the downstream end of the straight section of the main water supply pipe 2. Its arc-shaped collection pipe section 20 has a collection channel 21 inside that connects to the main water supply pipe 2 via a guide port 22 at the top. When the silicone elastic scraper ball 15 travels with the water flow in the main water supply pipe 2 to the position of the trap 18, due to the special structure of the arc-shaped collection pipe section 20 and the action of the water flow, the scraper ball will enter the collection channel 21 along the guide port 22. A baffle net 23 fixed to the inner wall of the main water supply pipe 2 downstream of the guide port 22 prevents the scraper ball from continuing to travel with the water flow, ensuring that it completely enters the collection channel 21.

[0111] After collection is complete, the ultrasonic vibrator 25, mounted on the quick-release end cap 24, is activated, emitting high-frequency vibrations. The ultrasonic vibrations propagate through the water accumulated inside the collection channel 21, generating a cavitation effect. This creates countless tiny cavitation bubbles in the water, which, upon collapse, generate immense pressure and impact, effectively removing dirt adhering to the surface of the scraper ball. After cleaning, the quick-release end cap 24 is unscrewed, the cleaned silicone elastic scraper ball 15 is removed, and any remaining water is drained. Subsequently, the cleaned scraper ball is reintroduced into the upstream pipe of the main water supply pipe 2 via the guide 19, continuing its pipe cleaning work with the water flow.

[0112] Utilizing the characteristics of water flow, the scraper ball is automatically collected, eliminating the need for an additional power source. The ultrasonic vibrator 25, combined with the cavitation effect of the water, delivers significant cleaning results, quickly removing stubborn dirt from the scraper ball's surface, making it more efficient than traditional cleaning methods.

[0113] In addition, the quick-release end cap 24 is designed for easy manual operation, facilitating the removal of the scraper ball and cleaning of residual water, thus reducing maintenance difficulty and time costs. The cleaned scraper ball can be quickly reused, ensuring the smooth recycling of the silicone elastic scraper ball 15 and improving resource utilization.

[0114] Based on any of the above technical solutions, a further optimization is made as follows: the guide 19 includes a guide pipe 26 integrally formed on the upstream pipe of the main water supply pipe 2, the bottom of the guide pipe 26 is connected to the interior of the upstream pipe of the main water supply pipe 2, and a sealing end cap 27 is installed on the top of the guide pipe 26. When the sealing end cap 27 is open, the silicone elastic scraper ball 15 enters the main water supply pipe 2 through the guide pipe 26.

[0115] The guide 19 is integrally formed into the upstream pipe of the main water supply pipe 2. The bottom of its guide pipe 26 is directly connected to the interior of the upstream pipe of the main water supply pipe 2, forming a channel for the silicone elastic scraper ball 15 to enter the main pipe. After the silicone elastic scraper ball 15 has finished cleaning in the catcher 18, the operator opens the sealing end cap 27 at the top of the guide pipe 26, at which point the guide pipe 26 and the main water supply pipe 2 form a clear passage. Under water pressure or with manual assistance, the cleaned silicone elastic scraper ball 15 can smoothly enter the upstream interior of the main water supply pipe 2 along the channel of the guide pipe 26, and move again with the water flow within the pipe to perform the cleaning task on the inner wall of the main water supply pipe 2.

[0116] The sealing end cap 27 provides flexibility in the use of the guide 19. When the scraper ball does not need to be placed, the sealing end cap 27 is closed to ensure that the water flow in the main water supply pipe 2 is undisturbed. When the cleaned scraper ball needs to be placed into the main pipe, the sealing end cap 27 can be opened to easily complete the placement operation, which is convenient for manual maintenance and management.

[0117] Based on any of the above technical solutions, a further optimization is made as follows: a low-frequency electromagnetic coil 11 is provided on the outer wall of the water inlet end of the cooling roller 10, and several spiral guide grooves 16 are provided along the circumference of the inner cavity side wall of the cooling roller 10. Each spiral guide groove 16 extends to both ends of the cooling roller 10, and the water outlet of the cooling roller 10 is connected to the pre-sedimentation tank 1 through the main water supply pipe 2.

[0118] A low-frequency electromagnetic coil 11, installed on the outer wall of the water inlet of the cooling roller 10, is activated during the cooling process of the cooling water entering the cooling roller 10 and generating a magnetic field of specific frequency and intensity. According to electromagnetic principles, calcium and magnesium ions in the cooling water experience Lorentz force under the influence of the magnetic field, altering their trajectory and thus inhibiting the crystallization of calcium and magnesium ions to form scale. Simultaneously, several spiral guide grooves 16 arranged circumferentially on the inner wall of the cooling roller 10 guide the incoming cooling water along the spiral trajectory, causing the water flow to rotate at high speed. Based on the principle of centrifugal force, the scale particles suspended in the water are thrown towards the inner wall of the cooling roller 10 under the centrifugal force generated by the high-speed rotation, and gradually move towards the water outlet of the cooling roller 10 under the guidance of the spiral guide grooves 16. Finally, the cooling water containing scale particles flows out from the outlet of the cooling roller 10 and returns to the pre-sedimentation tank 1 through the main water supply pipe 2 for a new round of circulation.

[0119] Based on any of the above technical solutions, a further optimization is made: when the silicone elastic scraper ball 15 reaches the position of the catcher 18 of the corresponding pipe, it is collected by it, and after being ultrasonically cleaned inside, it is sent back into the corresponding pipe for recycling, thereby realizing dynamic self-cleaning inside the pipe.

[0120] The silicone elastic scraper ball 15 moves back and forth with the water flow in the main water supply pipe 2, scraping and cleaning the inner wall of the pipe. When the scraper ball reaches the position of the catcher 18 with the water flow, the special structural design of the arc-shaped collection pipe section 20 of the catcher 18 changes the direction of water flow. At the same time, with the cooperation of the guide port 22 and the blocking net 23, the scraper ball smoothly enters the collection channel 21 and is collected. After entering the collection channel 21, the ultrasonic vibrator 25 installed on the quick-release end cap 24 of the catcher 18 is activated. The ultrasonic waves propagate in the water in the collection channel 21, generating a cavitation effect. The cavitation effect forms a large number of tiny cavitation bubbles in the water. When these cavitation bubbles collapse instantaneously, they generate a powerful impact force, which can effectively remove the dirt attached to the surface of the scraper ball. After cleaning, the operator opens the quick-release end cap 24, takes out the cleaned scraper ball, and puts it back into the upstream pipe of the main water supply pipe 2 through the guide 19. At this point, the scraper ball moves with the water flow again, continuing to clean the inner wall of the pipe. This cycle repeats, achieving dynamic self-cleaning inside the pipe.

[0121] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention. For those skilled in the art, any alternative improvements or transformations made to the implementation of the present invention fall within the protection scope of the present invention.

[0122] Any aspects of this invention not described in detail are well-known to those skilled in the art.

Claims

1. A method for multi-stage circulation treatment of cooling water, characterized in that, Includes the following steps: a. Pretreatment: The scale-containing cooling water discharged from the cooling rollers inside each conveyor belt workshop enters the pre-sedimentation tank of the plant's cooling water treatment station through the downstream main water supply pipeline. The pre-sedimentation tank uses the inclined tube packing at the bottom of the tank to remove plastic debris, metal rust and large suspended particles by gravity sedimentation. b. Chemical treatment: During the pipeline transportation of pretreated softened water, a fully mixed scale inhibitor and corrosion inhibitor are injected into the pipeline through an externally configured metering pump; the pipeline water continues to be sent into a vortex reaction tank, where the mixed agents react with tiny calcium and magnesium ions in the water at the bottom of the tank to form flocculent matter; the mixed solution then flows into an inclined plate sedimentation tank, which inhibits scale crystallization and forms a protective film on the inner surface of the pipeline metal. c. Precision filtration: A centrifugal pump is used to pump the chemically treated effluent from the inclined plate sedimentation tank into the ultrafiltration equipment to trap colloids, microorganisms and unsettled scale precursors. The produced water enters the clear water tank for later use. d. Pipeline self-cleaning: Before the produced water is sent to the fixed-axis rotating cooling roller through the pipeline, it is first pressurized by the hydraulic pulse generator and then high-pressure pulses are sprayed into the interior of the cooling roller to impact the inner wall of the cooling roller and shake off the initial soft scale. e. Non-destructive descaling and circulation of cooling rollers: A low-frequency electromagnetic coil is pre-wound on the outer wall of the water inlet end of the cooling roller. Its working frequency is 20-50kHz and the magnetic field strength is 0.1-0.3T. During the cooling process of cooling water entering the cooling roller, the low-frequency electromagnetic coil is activated to change the movement trajectory of calcium and magnesium ions and inhibit their crystallization. Step d also includes placing several food-grade silicone elastic scraper balls with a diameter 3-5 mm larger than the inner diameter of the main water supply pipe into the main water supply pipe, with raised textures on the surface of the balls; installing a catcher for catching the silicone elastic scraper balls at the downstream end of the straight section of the main water supply pipe, and installing a guide at the upstream end of the straight section of the main water supply pipe, the guide being used to send the cleaned silicone elastic scraper balls into the upstream inner pipe of the straight section of the main water supply pipe. The trap includes an arc-shaped collection pipe section integrally formed and installed at the downstream end of a straight section of the main water supply pipeline. The arc-shaped collection pipe section has an internal collection channel for the silicone elastic scraper ball to enter. A guide port is provided at the top of the collection channel where it intersects with the main water supply pipeline. A baffle net is fixed to the inner wall of the main water supply pipeline downstream of the guide port. Quick-release end caps are screwed onto the front and rear sides of the end of the arc-shaped collection pipe section. An ultrasonic vibrator is installed on one of the quick-release end caps. The ultrasonic vibrator is used to ultrasonically clean the water and silicone elastic scraper ball accumulated inside the collection channel. After the silicone elastic scraper ball is cleaned, it is removed by opening the quick-release end cap and the residual water is drained. The cleaned silicone elastic scraper ball is then reintroduced into the upstream pipeline of the main water supply pipeline via the guide port.

2. The method for multi-stage circulation treatment of cooling water according to claim 1, characterized in that: in, The scale inhibitor uses 5-10 ppm of organophosphonate scale inhibitor, and the corrosion inhibitor uses 2-5 ppm of molybdate corrosion inhibitor.

3. The method for multi-stage circulation treatment of cooling water according to claim 2, characterized in that: Step a also includes transporting the effluent from the pre-sedimentation tank to an ion exchange tank via a booster pump installed on a pipeline. The tank is filled with a strong acid cation exchange resin, and then... + With Ca in water 2+ Mg 2+ A displacement reaction occurs, reducing the water hardness to below 30 ppm, thus completing the softening and hardness reduction treatment.

4. The method for multi-stage circulation treatment of cooling water according to claim 3, characterized in that: Step c also includes periodically backwashing the ultrafiltration membrane with air and water at a pressure of 0.2 MPa and a flow rate of 100 L / m³. 2 Under the action of a water flow rate of .min, the backwash wastewater is returned to the pre-sedimentation tank; at the same time, the water quality is monitored in real time by a conductivity meter, pH meter and hardness meter installed on the clear water tank, and the data is connected to the PLC control system. When the water quality index exceeds the standard, the bypass pipeline is automatically started for secondary softening.

5. The method for multi-stage circulation treatment of cooling water according to claim 4, characterized in that: The ultrafiltration membrane of the ultrafiltration device has a pore size of 0.01 μm, and the ultrafiltration membrane is periodically subjected to a gas pressure of 0.2 MPa and a flow rate of 100 L / m³. 2 The air-water backwash is performed using a water flow rate of .min.

6. A multi-stage circulating cooling water treatment device, characterized in that: The device is used to complete the multi-stage circulation treatment method for cooling water as described in any one of claims 3-5. The device includes a pre-sedimentation tank, an ion exchange tank, a vortex reaction tank, an inclined plate sedimentation tank, an ultrafiltration device, and a clear water tank connected in sequence by pipelines. The pre-sedimentation tank is located inside the plant's cooling water treatment station. The clear water tank is connected to the inlet of each cooling roller through the main water supply pipeline. A hydraulic pulse generator is installed on the pipeline at the inlet end of the cooling roller. The nozzle of the hydraulic pulse generator extends into the inlet at the end of the cooling roller and is used to spray high-pressure pulsed water into the interior of the cooling roller. Both ends of the cooling roller are inserted into bearing seats at corresponding positions through the central tubes at their respective ends, and the cooling roller is driven by the conveyor belt to be cooled. A silicone elastic scraper ball is placed inside the main water supply pipe. A catcher for capturing the silicone elastic scraper ball is installed at the downstream end of the straight section of the main water supply pipe. A guide is installed at the upstream end of the straight section of the main water supply pipe. The guide is used to send the cleaned silicone elastic scraper ball into the upstream internal pipe of the straight section of the main water supply pipe. The trap includes an arc-shaped collection pipe section integrally formed and installed at the downstream end of the straight section of the main water supply pipeline. The arc-shaped collection pipe section has a collection channel inside for the silicone elastic scraper ball to enter. A guide port is provided at the top of the collection channel and at the pipe of the main water supply pipeline. A baffle net is fixed on the inner wall of the main water supply pipeline downstream of the guide port. Quick-release end caps are screwed on the front and rear sides of the end of the arc-shaped collection pipe section. An ultrasonic vibrator is installed on one of the quick-release end caps. The ultrasonic vibrator is used to ultrasonically clean the water and silicone elastic scraper ball accumulated inside the collection channel. After the silicone elastic scraper ball is cleaned, the silicone elastic scraper ball is removed and the residual water is discharged by opening the quick-release end cap. The cleaned silicone elastic scraper ball is reintroduced into the upstream pipe of the main water supply pipeline through the guide. The cooling roller has a low-frequency electromagnetic coil at its inlet end outer wall with a working frequency of 20-50kHz and a magnetic field strength of 0.1-0.3T. The inner wall of the cooling roller has several spiral guide grooves along its circumference, and each spiral guide groove extends to both ends of the cooling roller. The outlet of the cooling roller is connected to the pre-sedimentation tank through the main water supply pipe.

Images