Intelligent chemical cleaning system and method for circulating water cooling equipment

Abstract

This invention belongs to the field of circulating water cooling system cleaning technology, specifically relating to an intelligent chemical cleaning system and method for circulating water cooling equipment. In this system, the inlet of the circulating water pump is connected to the outlet of both the circulating chemical cleaning tank and the cleaning tank; the dosing port of the circulating chemical cleaning tank is connected to the outlet of the dosing metering pump, and the inlet of the dosing metering pump is connected to the outlet of the chemical tank; the outlet of the circulating water pump is connected to the inlet of the air-cooled heat exchanger, and the outlet of the air-cooled heat exchanger is connected to the equipment to be cleaned via an inlet pipe. The equipment to be cleaned is connected to a return water pipe, which is divided into two branches: one branch connects to the inlet of the waste liquid collection tank via a fifth electrically controlled valve, and the other branch connects sequentially to the inlet of the cleaning tank via a fourth electrically controlled valve and to the inlet of the circulating chemical cleaning tank via a third electrically controlled valve. This system can achieve independent intelligent cleaning of a single heat exchanger without shutting down the system, and is adaptable to large-scale continuous circulating water production systems consisting of hundreds of heat exchangers.

Description

Technical Field

[0001] This invention belongs to the field of cleaning technology for circulating water cooling systems, specifically relating to an intelligent chemical cleaning system and method for circulating water cooling equipment. Background Technology

[0002] In the field of industrial circulating water heat exchange equipment operation and maintenance, scaling is a core issue affecting heat exchanger efficiency, equipment lifespan, and production stability. Calcium and magnesium ions, suspended solids, microorganisms, and other substances in the circulating water adhere to the heat exchanger tube walls over a long period, forming a hard scale layer. This leads to a decrease in heat transfer coefficient, pipe blockage, and increased equipment energy consumption. In severe cases, it can cause equipment failure and production line shutdown. Therefore, regular descaling and cleaning maintenance of heat exchange equipment is necessary.

[0003] Currently, heat exchanger descaling and maintenance technologies in the industry are mainly divided into three categories: physical descaling, electrochemical scale inhibition, and chemical cleaning. Among them, physical descaling mostly uses high-pressure water flushing and mechanical scraping, which can only remove loose scale on the surface of the equipment and is extremely ineffective at removing dense and hard scale layers on the tube walls. Electrochemical scale inhibition mainly focuses on preventing scale formation and cannot effectively remove existing thick or stubborn scale. It is only suitable for routine maintenance and protection and is not suitable for deep cleaning of old equipment or equipment with high scaling.

[0004] Chemical cleaning, with its advantages of thorough descaling and wide applicability, has become the mainstream method for deep descaling of industrial heat exchangers. However, current chemical cleaning technologies and equipment have significant limitations: most existing chemical cleaning systems and devices are designed for single, small heat exchangers, with limited functionality and structure, only capable of offline cleaning operations after the individual equipment is shut down. For clustered heat exchange circulating water systems integrating hundreds of devices, there is currently no mature integrated cleaning equipment that can achieve independent online cleaning of individual devices without affecting the overall system operation.

[0005] Meanwhile, the level of intelligence in existing chemical cleaning equipment is generally low. Most equipment lacks intelligent control programs such as automatic proportioning, independent control, fault warning, and zoned operation, and the entire cleaning operation relies on manual intervention. Furthermore, existing cleaning processes cannot achieve zoned, independent, and differentiated online cleaning of cluster equipment. The entire system must be shut down or cleaned synchronously, which cannot adapt to the equipment operation and maintenance needs of continuous, large-scale industrial production scenarios, and makes it difficult to balance cleaning effect, production continuity, environmental protection, and economy.

[0006] For clustered circulating water systems equipped with hundreds of independent heat exchangers, existing cleaning processes and equipment have many substantial technical defects: the cleaning mode is extensive, resulting in serious resource waste; the volume of cleaning waste liquid is large, posing a significant environmental pressure; the system has weak anti-interference capabilities and low operating efficiency; and it cannot be adapted to continuous production equipment, resulting in large economic losses. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention aims to provide an intelligent chemical cleaning system for circulating water cooling equipment. This system can achieve independent, differentiated, and intelligent cleaning of individual heat exchangers without system shutdown. It can be adapted to large-scale continuous circulating water production systems consisting of hundreds of heat exchangers, effectively solving the technical problems of poor cleaning targeting, large waste liquid pollution, low system fault tolerance, inability to operate continuously, and low level of intelligence in existing technologies.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An intelligent chemical cleaning system for circulating water-cooled equipment includes a circulating chemical cleaning unit, a cooling unit, an automatic dosing unit, a clean water rinsing unit, and a waste liquid collection unit. The circulating chemical cleaning unit includes a circulating water pump and a circulating chemical cleaning tank. The cooling unit includes an air-cooled heat exchanger. The automatic dosing unit includes a chemical tank and a dosing metering pump. The clean water rinsing unit includes a cleaning tank. The waste liquid collection unit includes a waste liquid collection tank. The inlet of the circulating water pump is connected to the outlet of the circulating chemical washing tank and the cleaning tank, respectively; the dosing port of the circulating chemical washing tank is connected to the outlet of the dosing metering pump, and the inlet of the dosing metering pump is connected to the outlet of the chemical tank; the outlet of the circulating water pump is connected to the inlet of the air-cooled heat exchanger, and the outlet of the air-cooled heat exchanger is connected to the equipment to be chemically washed through the inlet pipe. The equipment to be chemically washed is connected to a return water pipe, which is divided into two branches. One branch is connected to the inlet of the waste liquid collection tank through the fifth solenoid valve, and the other branch is connected to the inlet of the cleaning tank through the fourth solenoid valve and to the inlet of the circulating chemical washing tank through the third solenoid valve.

[0009] Furthermore, a first electrically controlled valve is installed at the outlet of the circulating washing tub; a second electrically controlled valve is installed at the outlet of the washing tub.

[0010] Furthermore, a filter is installed between the outlet of the circulating water pump and the inlet of the air-cooled heat exchanger.

[0011] Furthermore, the system also includes an online monitoring unit, which includes a pressure sensor installed at the outlet of the circulating water pump.

[0012] Furthermore, the online monitoring unit also includes an electromagnetic flow meter, which is installed on the inlet pipe.

[0013] Furthermore, the online monitoring unit also includes a temperature sensor, a conductivity meter, and a pH meter. A first manual valve is installed on a branch of the return water pipeline at the front end of the fourth electrically controlled valve. A branch pipe is connected to both ends of the first manual valve, and the temperature sensor, conductivity meter, and pH meter are installed on the branch pipe.

[0014] Furthermore, corresponding second manual valves are installed at both ends of the branch pipe near the return water pipe.

[0015] Furthermore, a third manual valve is installed below each of the circulating washing tank, the chemical tank, the cleaning tank, and the waste liquid collection tank.

[0016] Furthermore, the system also includes an electrical control unit, which includes an electrical control cabinet for parameter reception and adaptive matching, data storage and traceability, and automatic start-stop control of each device.

[0017] Furthermore, this invention also proposes an intelligent chemical cleaning method for circulating water cooling equipment, specifically including the following steps: S1. Chemical cleaning preparation: Connect the inlet and outlet of the equipment to be cleaned to the inlet water pipe and return water pipe respectively, close the inlet and outlet water valves of the original cooling water system of the equipment to be cleaned, inject clean water into the circulating chemical cleaning tank and add chemical cleaning agent to prepare a chemical cleaning solution of the predetermined concentration. S2. Circulating chemical cleaning: Open the first and third solenoid valves, close the second, fourth and fifth solenoid valves, start the circulating water pump, so that the chemical cleaning solution passes through the filter and the air-cooled heat exchanger in sequence before entering the equipment to be chemically cleaned. The chemical cleaning solution flowing out of the equipment to be chemically cleaned flows back to the circulating chemical cleaning tank through the return water pipeline and the third solenoid valve, forming a closed loop. S3. Intelligent Control: The control cabinet monitors the circulating pressure and flow rate in real time through pressure sensors and electromagnetic flow meters, and adjusts the speed of the circulating water pump through a frequency converter to maintain the chemical cleaning pressure and flow rate within the set range; it monitors the temperature of the chemical cleaning solution in real time through a temperature sensor, and adjusts the speed of the axial flow fan of the air-cooled heat exchanger through a frequency converter to maintain the temperature of the chemical cleaning solution within the set range; it monitors the pH value of the chemical cleaning solution in real time through a pH meter, and controls the start and stop of the dosing pump according to the pH value change to replenish the chemical cleaning agent in the circulating chemical cleaning tank, so as to maintain the concentration of the chemical cleaning solution within the set range; S4. Endpoint determination: The conductivity of the chemical washing solution is monitored in real time by a conductivity meter. When the conductivity no longer increases for a certain period of time, the chemical washing reaction is determined to be complete, and the process enters the water rinsing stage. S5. Clean water rinsing: Close the first and third solenoid valves, open the second solenoid valve, and simultaneously open the fifth solenoid valve for a certain period of time to discharge the residual cleaning solution in the pipeline into the waste liquid collection tank. Then close the fifth solenoid valve and open the fourth solenoid valve to allow clean water to be pumped by the circulating water pump to circulate and rinse the equipment to be cleaned for a period of time. S6. Cleaning complete: After rinsing is completed, the control cabinet will issue an audible and visual alarm. Manually open the inlet and outlet valves of the original cooling water system of the equipment to be cleaned, close the connecting valve between the cleaning system and the equipment to be cleaned, restore the normal cooling water supply to the equipment to be cleaned, stop the circulating water pump, and complete the cleaning operation.

[0018] The beneficial effects of this invention are as follows: 1. This invention enables independent online cleaning of a single device without downtime. It employs a modular, distributed online cleaning integrated system design, allowing connection to any heat exchanger in an industrial cluster-style circulating water system. This enables individual online cleaning of a single device without affecting the normal operation of other equipment in the system, avoiding production losses and economic losses caused by overall downtime. It is particularly suitable for core heat exchanger groups requiring 24-hour continuous operation, such as hexahedral presses in the diamond industry.

[0019] 2. This invention offers highly targeted cleaning with minimal chemical consumption. Equipped with online monitoring devices such as pH meters, conductivity meters, and temperature sensors, and controlled by a PLC intelligent control system, it can monitor water quality changes in real time during the chemical cleaning process. Based on the actual scaling condition of each heat exchanger, it dynamically adjusts parameters such as chemical concentration, cleaning pressure, and circulation flow rate, achieving differentiated and targeted cleaning. This avoids the problems of excessive chemical dosage for lightly scaled equipment and incomplete cleaning for heavily scaled equipment, significantly reducing the ineffective consumption of chemical cleaning agents and lowering cleaning costs.

[0020] 3. This invention produces a small amount of waste liquid, making it environmentally friendly and economical. The invention employs a single-unit independent cleaning mode, generating only a small amount of cleaning waste liquid per cleaning cycle. Furthermore, the system is equipped with a dedicated waste liquid collection tank, allowing for centralized collection and treatment of the cleaning waste liquid. This avoids the problem of generating hundreds of tons of high-concentration chemical cleaning waste liquid during overall online cleaning, significantly reducing the difficulty and cost of waste liquid treatment and meeting industrial environmental compliance requirements.

[0021] 4. The system of the present invention has high fault tolerance and controllable cleaning period; if a single heat exchanger is damaged, leaks media, or has pipeline failure during the cleaning process, it will only affect the cleaning operation of that single device and will not interfere with the cleaning media circulation and reagent ratio of the entire system, thus avoiding the problem of interruption and rework of the overall cleaning operation, greatly improving the efficiency of equipment operation and maintenance, and ensuring the normal scheduling and operation of the entire industrial system.

[0022] 5. This invention features a high degree of intelligence, low labor costs, and good cleaning stability. It employs an industrial PLC programmable controller as the core control hub, equipped with an embedded intelligent control program. This programmable controller possesses independent channel control, adaptive parameter matching, fault monitoring and alarm functions, data storage and traceability, and automatic start / stop control. It can automatically complete processes such as reagent mixing, pressure adjustment, flow control, duration management, and fault monitoring without requiring manual intervention. This not only saves significant manpower and resources but also avoids the problem of unbalanced cleaning parameters caused by human error, ensuring stable and reliable cleaning quality.

[0023] 6. This invention provides accurate determination of the cleaning endpoint and ensures effective cleaning. By using a conductivity meter to monitor the conductivity changes of the chemical cleaning solution in real time, the chemical cleaning reaction is automatically determined to be complete when the conductivity no longer increases for 30 consecutive minutes. This allows for precise determination of the cleaning endpoint, avoiding both incomplete cleaning due to insufficient cleaning time and waste of reagents and equipment corrosion caused by excessive cleaning time. This ensures effective cleaning while improving cleaning efficiency. Attached Figure Description

[0024] Fig. 1 This is a top view of the system of the present invention; Fig. 2 This is a front view of the system of the present invention; Fig. 3 This is a structural view of the air-cooled heat exchanger of the present invention.

[0025] Reference numerals: 1. Circulating water pump; 2. Filter; 3. Air-cooled heat exchanger; 31. Louver; 32. Finned tube; 33. Axial flow fan; 41. Electromagnetic flow meter; 42. Temperature sensor; 43. pH meter; 44. Conductivity meter; 45. Pressure sensor; 51. First manual valve; 52. Second manual valve; 53. Third manual valve; 61. First electrically controlled valve; 62. Second electrically controlled valve; 63. Third electrically controlled valve; 64. Fourth electrically controlled valve; 65. Fifth electrically controlled valve; 7. Cleaning tank; 8. Waste liquid collection tank; 9. Electrical control cabinet; 10. Chemical tank; 11. Dosing metering pump; 12. Circulating washing tank. Detailed Implementation

[0026] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are for illustrative purposes only and are not intended to limit the scope of the invention.

[0027] like Figs. 1 to 3 As shown, this invention proposes an intelligent chemical cleaning system for circulating water-cooled equipment. The system consists of seven main parts: an electrical control unit, a circulating chemical cleaning unit, a cooling unit, an automatic chemical dosing unit, a clean water rinsing unit, a waste liquid collection unit, and an online monitoring unit. Each unit operates in conjunction with the other, and the system can be connected to any heat exchanger in an industrial cluster circulating water system to achieve independent online cleaning of a single device without affecting the normal operation of the rest of the system.

[0028] The circulating cleaning unit includes a circulating water pump 1, a circulating cleaning tank 12, and corresponding connecting pipelines. The clean water rinsing unit includes a cleaning tank 7. The outlet of the cleaning tank 7 and the outlet of the circulating cleaning tank 12 are connected to the inlet of the circulating water pump 1 via pipelines. A second solenoid valve 62 is installed at the outlet of the cleaning tank 7 to control the flow of water from the cleaning tank 7. The cleaning tank 7 is used to store clean water for rinsing the equipment to be cleaned after cleaning. A first solenoid valve 61 is installed at the outlet of the circulating cleaning tank 12 to control the flow of water from the circulating cleaning tank 12. The outlet of the circulating water pump 1 is connected to the inlet of a filter 2 via pipelines. The filter 2 is a stainless steel security filter with a filtration accuracy of 1mm, used to filter impurities in the cleaning solution and protect downstream equipment and pipelines.

[0029] The cooling unit includes an air-cooled heat exchanger 3. The inlet of the air-cooled heat exchanger 3 is connected to the outlet of the filter 2 via a pipeline, and the outlet of the air-cooled heat exchanger 3 is connected to the equipment to be cleaned via a water inlet pipeline. The air-cooled heat exchanger 3 adopts an existing finned tube heat exchanger structure, including a heat exchanger fixing frame, louvers 31, finned tubes 32, and an axial flow fan 33. The heat exchanger fixing frame can be made of 10mm thick steel plate, and finned tubes 32 are installed inside the frame. The finned tubes 32 are stainless steel pipes with 0.2mm thick stainless steel fins distributed on the outside to increase the heat dissipation area of ​​the pipes. An axial flow fan 33 is installed on one side of the heat exchanger. By drawing in cold air, it allows cold air to flow through the finned tube heat exchanger to cool the hot water in the pipes. The PLC senses the temperature of the return water from the circulating cleaning solution and adjusts the speed of the axial flow fan 33 to stabilize the temperature of the circulating liquid.

[0030] The automatic dosing unit includes a chemical tank 10 and a dosing pump 11. The chemical tank 10 stores the chemical cleaning agent. The inlet of the dosing pump 11 is connected to the outlet of the chemical tank 10 via a pipeline, and the outlet of the dosing pump 11 is connected to the dosing port of the circulating cleaning tank 12 via a pipeline. By controlling the start and stop of the dosing pump 11, the chemical agent can be quantitatively replenished into the circulating cleaning tank 12, stabilizing the effective concentration of the cleaning solution during the cleaning process.

[0031] The waste liquid collection unit includes a waste liquid collection tank 8. The inlet of the waste liquid collection tank 8 is connected to a branch of the return water pipeline through a fifth solenoid valve 65 to collect the residual cleaning solution in the pipeline after the cleaning is completed, so as to realize the centralized collection and treatment of waste liquid.

[0032] The equipment to be cleaned is connected to a return water pipeline, which is divided into two branches. One branch connects to the inlet of the waste liquid collection tank 8 via the fifth solenoid valve 65, and the other branch connects to the inlet of the cleaning tank 7 via the fourth solenoid valve 64 and to the inlet of the circulating cleaning tank 12 via the third solenoid valve 63. By controlling the opening and closing of each solenoid valve, different working modes such as cleaning solution circulation, clean water circulation, and waste liquid discharge can be switched.

[0033] The online monitoring unit includes a pressure sensor 45, an electromagnetic flow meter 41, a temperature sensor 42, a conductivity meter 44, and a pH meter 43. A pressure sensor 45 is installed at the outlet of the circulating water pump 1 to measure the chemical washing pressure in real time. An electromagnetic flow meter 41 is installed on the inlet pipe to monitor the chemical washing flow rate, and the flow signal is fed into the PLC controller of the electrical control cabinet 9.

[0034] A first manual valve 51 is installed on a branch of the return water pipeline upstream of the fourth electrically controlled valve 64. A branch pipe is connected to both ends of the first manual valve 51, and a temperature sensor 42, a conductivity meter 44, and a pH meter 43 are installed on the branch pipe to measure the temperature, conductivity, and pH value of the cleaning solution after heat exchange. Corresponding second manual valves 52 are installed at the ends of the branch pipes near the return water pipeline to facilitate sensor maintenance and replacement. A third manual valve 53 is installed below the circulating cleaning tank 12, the reagent tank 10, the cleaning tank 7, and the waste liquid collection tank 8 to discharge residual liquid from the tanks. In this embodiment, UPVC pipes are used to connect the various devices.

[0035] The electrical control unit, serving as the core control hub of the system, includes electrical control cabinet 9, which houses an industrial PLC programmable controller (model: S7-200SMART) equipped with an embedded intelligent control program. It features independent channel control, adaptive parameter matching, fault monitoring and alarm, data storage and traceability, and automatic start / stop control functions. Electrical control cabinet 9 uses a pH meter 43, temperature sensor 42, and conductivity meter 44 to sense changes in water quality during the circulating washing process, and monitors parameters such as operating pressure, water temperature, pH value, conductivity, and flow rate of the circulating washing system in real time. The PLC controls the flow rate and water temperature by adjusting the speed of the axial flow fan on the circulating water pump 1 and the air-cooled heat exchanger 3 through the frequency converter. Combined with the signal from the pH meter 43, the PLC controls the start and stop of the dosing pump 11 on the top of the chemical tank 10 to stabilize the pH of the water during the cleaning process. Finally, the conductivity meter 44 determines whether the cleaning endpoint has been reached. If the conductivity does not increase for 30 consecutive minutes, it means that the cleaning has reached the endpoint. The inlet and outlet solenoid valves of the circulating water pump 1 switch from the circulating cleaning tank 12 to the clean water tank 7, and the cleaning is changed to clean water rinsing. The water discharged in the first 60 seconds of rinsing is discharged into the waste liquid collection tank 8, and then the rinsing is circulated for 30 minutes to complete the equipment cleaning. After the equipment water pump stops, the valves of the cleaning equipment and the corresponding equipment to be cleaned are cut off, and the original cooling water inlet and outlet valves of the equipment to be cleaned are opened to complete the cleaning.

[0036] The electronic control program has a built-in library of multiple standard cleaning process parameters, covering three scaling conditions: light, moderate, and heavy. It can automatically match the agent concentration, cleaning pressure, circulation flow rate, and cleaning duration based on sensor monitoring data, while also supporting manual parameter correction and mode switching. The equipment is equipped with a 7-inch industrial touchscreen display, showing real-time operating status, pressure, flow rate, pH, conductivity, temperature, and other water quality parameters. It also features fault pop-up alarms and audible and visual alerts.

[0037] Furthermore, based on the aforementioned intelligent chemical cleaning system for circulating water cooling equipment, this invention also proposes an intelligent chemical cleaning method for circulating water cooling equipment, specifically including the following steps: 1) Chemical cleaning preparation stage: Connect the inlet and outlet of the equipment to be cleaned to the inlet water pipe and return water pipe respectively, close the inlet and outlet water valves of the original cooling water system of the equipment to be cleaned, inject clean water into the circulating chemical cleaning tank 12 and add chemical cleaning agent to prepare a chemical cleaning solution of predetermined concentration.

[0038] 2) Circulating chemical cleaning stage: Open the first solenoid valve 61 and the third solenoid valve 63, close the second solenoid valve 62, the fourth solenoid valve 64 and the fifth solenoid valve 65, start the circulating water pump 1, so that the chemical cleaning solution passes through the filter 2 and the air-cooled heat exchanger 3 in sequence before entering the equipment to be chemically cleaned. The chemical cleaning solution flowing out of the equipment to be chemically cleaned flows back to the circulating chemical cleaning tank 12 through the return water pipeline and the third solenoid valve 63, forming a closed loop.

[0039] 3) Intelligent control stage: The electrical control cabinet 9 monitors the circulating pressure and flow rate in real time through the pressure sensor 45 and the electromagnetic flow meter 41, and adjusts the speed of the circulating water pump 1 through the frequency converter to maintain the chemical cleaning pressure and flow rate within the set range; it monitors the temperature of the chemical cleaning solution in real time through the temperature sensor 42, and adjusts the speed of the axial flow fan of the air-cooled heat exchanger 3 through the frequency converter to maintain the temperature of the chemical cleaning solution within the set range; it monitors the pH value of the chemical cleaning solution in real time through the pH meter 43, and controls the start and stop of the dosing metering pump 11 according to the pH value change to replenish the chemical cleaning agent into the circulating chemical cleaning tank 12 to maintain the concentration of the chemical cleaning solution within the set range.

[0040] 4) Endpoint judgment stage: The conductivity of the cleaning solution is monitored in real time by a conductivity meter 44. After 60 minutes without significant change, it is confirmed that no more scale ions are dissolved in the cleaning solution and the pH no longer changes. The central control system then judges that the cleaning is over and reminds the screen that the cleaning is over. At the same time, this process can also be completed on a timer. The cleaning time can be set in advance, and the cleaning end procedure will be entered after the cleaning time is reached.

[0041] 5) Clean water rinsing stage: Close the first solenoid valve 61 and the third solenoid valve 63, open the second solenoid valve 62, and simultaneously open the fifth solenoid valve 65 for 60 seconds to discharge the residual cleaning solution in the pipeline into the waste liquid collection tank 8. Then close the fifth solenoid valve 65 and open the fourth solenoid valve 64 to allow clean water to be pumped by the circulating water pump 1 to circulate and rinse the equipment to be cleaned for 30 minutes.

[0042] 6) End of cleaning stage: After rinsing is completed, the electrical control cabinet 9 will issue an audible and visual alarm to remind the operator that the cleaning process is complete. Manually open the inlet and outlet valves of the original cooling water system of the equipment to be cleaned, close the connecting valve between the cleaning system and the equipment to be cleaned, restore the normal cooling water supply to the equipment to be cleaned, and manually shut down the circulating cleaning system to complete the cleaning operation.

[0043] This invention employs a modular distributed online cleaning integrated system design, enabling independent online cleaning of individual heat exchangers without downtime and without affecting the normal operation of other equipment in the system. This solves the problems of low fault tolerance and high economic losses in the overall cleaning of clustered heat exchanger systems. Through a PLC intelligent control system combined with multiple online monitoring sensors, it achieves fully automated intelligent control of the cleaning process, dynamically adjusting cleaning parameters according to the actual scaling status, thus solving the problems of poor cleaning targeting, high labor costs, and poor cleaning stability. The invention utilizes conductivity endpoint determination technology to accurately determine the cleaning endpoint, ensuring cleaning effectiveness while avoiding reagent waste. It is equipped with a dedicated waste liquid collection unit to achieve centralized collection and treatment of waste liquid, significantly reducing waste liquid volume and environmental treatment costs.

[0044] Obviously, the embodiments described above are only some embodiments of this application, not all embodiments. The accompanying drawings show preferred embodiments of this application, but do not limit the patent scope of this application. This application can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this application's specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the scope of patent protection of this application.

Claims

1. An intelligent chemical cleaning system for circulating water cooling equipment, characterized in that: The system includes a circulating chemical washing unit, a cooling unit, an automatic dosing unit, a clean water rinsing unit, and a waste liquid collection unit. The circulating chemical washing unit includes a circulating water pump and a circulating chemical washing tank. The cooling unit includes an air-cooled heat exchanger. The automatic dosing unit includes a chemical tank and a dosing metering pump. The clean water rinsing unit includes a washing tank. The waste liquid collection unit includes a waste liquid collection tank. The inlet of the circulating water pump is connected to the outlet of the circulating chemical washing tank and the cleaning tank, respectively; the dosing port of the circulating chemical washing tank is connected to the outlet of the dosing metering pump, and the inlet of the dosing metering pump is connected to the outlet of the chemical tank; the outlet of the circulating water pump is connected to the inlet of the air-cooled heat exchanger, and the outlet of the air-cooled heat exchanger is connected to the equipment to be chemically washed through the inlet pipe. The equipment to be chemically washed is connected to a return water pipe, which is divided into two branches. One branch is connected to the inlet of the waste liquid collection tank through the fifth solenoid valve, and the other branch is connected to the inlet of the cleaning tank through the fourth solenoid valve and to the inlet of the circulating chemical washing tank through the third solenoid valve.

2. The intelligent chemical cleaning system for circulating water cooling equipment according to claim 1, characterized in that: A first electrically controlled valve is installed at the outlet of the circulating washing tub; a second electrically controlled valve is installed at the outlet of the washing tub.

3. The intelligent chemical cleaning system for circulating water cooling equipment according to claim 2, characterized in that: A filter is installed between the outlet of the circulating water pump and the inlet of the air-cooled heat exchanger.

4. The intelligent chemical cleaning system for circulating water cooling equipment according to claim 3, characterized in that: It also includes an online monitoring unit, which includes a pressure sensor installed at the outlet of the circulating water pump.

5. The intelligent chemical cleaning system for circulating water cooling equipment according to claim 4, characterized in that: The online monitoring unit also includes an electromagnetic flow meter, which is installed on the inlet pipe.

6. The intelligent chemical cleaning system for circulating water cooling equipment according to claim 5, characterized in that: The online monitoring unit also includes a temperature sensor, a conductivity meter, and a pH meter. A first manual valve is installed on a branch of the return water pipeline at the front end of the fourth electrically controlled valve. A branch pipe is connected to both ends of the first manual valve, and the temperature sensor, conductivity meter, and pH meter are installed on the branch pipe.

7. The intelligent chemical cleaning system for circulating water cooling equipment according to claim 6, characterized in that: The branch pipe is equipped with corresponding second manual valves at both ends near the return water pipe.

8. The intelligent chemical cleaning system for circulating water cooling equipment according to claim 1, characterized in that: A third manual valve is installed below each of the circulating washing tank, the chemical tank, the cleaning tank, and the waste liquid collection tank.

9. The intelligent chemical cleaning system for circulating water cooling equipment according to claim 1, characterized in that: It also includes an electrical control unit, which includes an electrical control cabinet for parameter reception and adaptive matching, data storage and traceability, and automatic start-stop control of each device.

10. A method for intelligent chemical cleaning of circulating water cooling equipment based on the intelligent chemical cleaning system for circulating water cooling equipment as described in claim 6, characterized in that: Specifically, the following steps are included: S1. Chemical cleaning preparation: Connect the inlet and outlet of the equipment to be cleaned to the inlet water pipe and return water pipe respectively, close the inlet and outlet water valves of the original cooling water system of the equipment to be cleaned, inject clean water into the circulating chemical cleaning tank and add chemical cleaning agent to prepare a chemical cleaning solution of the predetermined concentration. S2. Circulating chemical cleaning: Open the first and third solenoid valves, close the second, fourth and fifth solenoid valves, start the circulating water pump, so that the chemical cleaning solution passes through the filter and the air-cooled heat exchanger in sequence before entering the equipment to be chemically cleaned. The chemical cleaning solution flowing out of the equipment to be chemically cleaned flows back to the circulating chemical cleaning tank through the return water pipeline and the third solenoid valve, forming a closed loop. S3. Intelligent Control: The control cabinet monitors the circulating pressure and flow rate in real time through pressure sensors and electromagnetic flow meters, and adjusts the speed of the circulating water pump through a frequency converter to maintain the chemical cleaning pressure and flow rate within the set range; it monitors the temperature of the chemical cleaning solution in real time through a temperature sensor, and adjusts the speed of the axial flow fan of the air-cooled heat exchanger through a frequency converter to maintain the temperature of the chemical cleaning solution within the set range; it monitors the pH value of the chemical cleaning solution in real time through a pH meter, and controls the start and stop of the dosing pump according to the pH value change to replenish the chemical cleaning agent in the circulating chemical cleaning tank, so as to maintain the concentration of the chemical cleaning solution within the set range; S4. Endpoint determination: The conductivity of the chemical washing solution is monitored in real time by a conductivity meter. When the conductivity no longer increases for a certain period of time, the chemical washing reaction is determined to be complete, and the process enters the water rinsing stage. S5. Clean water rinsing: Close the first and third solenoid valves, open the second solenoid valve, and simultaneously open the fifth solenoid valve for a certain period of time to discharge the residual cleaning solution in the pipeline into the waste liquid collection tank. Then close the fifth solenoid valve and open the fourth solenoid valve to allow clean water to be pumped by the circulating water pump to circulate and rinse the equipment to be cleaned for a period of time. S6. Cleaning complete: After rinsing is completed, the control cabinet will issue an audible and visual alarm. Manually open the inlet and outlet valves of the original cooling water system of the equipment to be cleaned, close the connecting valve between the cleaning system and the equipment to be cleaned, restore the normal cooling water supply to the equipment to be cleaned, stop the circulating water pump, and complete the cleaning operation.

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