Indirect air cooling circulating water system multifunctional water purification system and operation method

Abstract

The application provides a kind of indirect air cooling circulating water system multifunctional water purification system and operating method, the system includes bypass flow monitoring device, sampling device, iron removal system, pH adjusting system arranged on the bypass of unit condenser inlet water chamber, water quality monitoring device is arranged on sampling device for detecting the pH value, iron content, conductivity and dissolved oxygen of indirect air cooling circulating water, iron removal system, pH adjusting system, water quality monitoring device, bypass flow monitoring device are connected with control system, control system is used to control the opening and closing of iron removal system and pH adjusting system.The application can combine water quantity, water quality control index, accurately, efficiently and timely control oxygen and carbon dioxide dosage, avoid the lag of artificial and manual monitoring leading to indirect air cooling circulating water quality unqualified, can control the iron content and pH value of indirect air cooling circulating water within a reasonable range, prevent radiator corrosion and leakage, ensure the safe and stable operation of unit.

Description

Technical Field

[0001] This invention relates to the field of water treatment in thermal power plants, specifically to a multifunctional water purification system and its operation method for an indirect air-cooled circulating water system. Background Technology

[0002] As high water-consuming enterprises, thermal power plants rely heavily on water for production, which is a crucial factor affecting their survival and development. Surface-type indirect air-cooled circulating water systems offer advantages such as small footprint, water conservation, and the ability to accommodate larger generating units, and are increasingly being used in newly built thermal power plants in water-scarce northern regions.

[0003] Because indirect air-cooled units often lack water purification devices during the design phase of their circulating cooling water systems, the circulating water often exhibits increased iron content and abnormally high pH levels. In severe cases, this can lead to radiator corrosion and leaks, affecting the safe and stable operation of the unit. Currently, there are no mature and effective methods for controlling the deterioration of the circulating cooling water quality. The main approach is to continuously change the water, resulting in significant consumption and waste of demineralized water, which contradicts the water-saving design intent of indirect air-cooled circulating cooling water systems. Therefore, timely monitoring of water quality changes and adjusting the iron content and pH of the circulating water in conjunction with water quality control indicators are crucial for the safe and stable operation of indirect air-cooled circulating water systems in thermal power plants. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a multifunctional water purification system and operation method for an indirect air-cooled circulating water system. The system monitors changes in the water quality of the indirect air-cooled circulating water using a water quality monitoring device, and, in conjunction with operational control requirements, controls the iron removal system in real time to remove iron from the circulating water. The system also monitors the pH value of the circulating water using the same device, and, in conjunction with operational control requirements, controls the pH adjustment system in real time to maintain the pH value within a suitable range. During operation, this invention can control the iron content and pH value of the indirect air-cooled circulating water within appropriate ranges, preventing corrosion and leakage of the indirect air-cooled radiators, extending the service life of the indirect air-cooled circulating water system equipment, and ensuring the safe and stable operation of the unit.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a multifunctional water purification system for an indirect air-cooled circulating water system, wherein a bypass flow monitoring device, a sampling device, an iron removal system, and a pH adjustment system are installed on the bypass of the condenser inlet water chamber of the unit. The sampling device is equipped with a water quality monitoring device for detecting the pH value, iron content, conductivity, and dissolved oxygen of the indirect air-cooled circulating water. The iron removal system, pH adjustment system, water quality monitoring device, and bypass flow monitoring device are all connected to the control system. The control system is used to control the opening and closing of the iron removal system and pH adjustment system based on the flow rate, pH value, iron content, conductivity, and dissolved oxygen data of the indirect air-cooled circulating water.

[0006] Furthermore, the unit condenser inlet water chamber is connected to the unit condenser inlet water chamber through an indirect air-cooled circulating water bypass pipe to form a unit condenser inlet water chamber bypass. A bypass flow monitoring device, a sampling device, an iron removal system, and a pH adjustment system are installed on the indirect air-cooled circulating water bypass pipe.

[0007] Furthermore, the sampling device includes a bypass sampling pipe, and the indirect air-cooled circulating water bypass pipe is connected to the wastewater tank inlet through the bypass sampling pipe. A bypass sampling solenoid valve and a water quality monitoring device are installed on the bypass sampling pipe. The water quality monitoring device includes a pH monitoring device, an iron content monitoring device, an electrical conductivity monitoring device, and a dissolved oxygen monitoring device, and the pH monitoring device, iron content monitoring device, electrical conductivity monitoring device, and dissolved oxygen monitoring device are connected to the control system.

[0008] Furthermore, the iron removal system includes a pressurization device, a filtration system, and an oxygen injection system. The filtration system filters out iron, and the oxygen injection system oxidizes iron ions in the indirect air-cooled circulating water. The booster device includes a booster pump installed on the bypass of the condenser inlet water chamber of the unit. The booster pump is connected to the bypass water supply of the condenser inlet water chamber of the unit through the booster pump inlet water pipe, and the booster pump is connected to the bypass flow monitoring device through the booster pump outlet water pipe. The filtration system includes a filter. The filter inlet is connected to the condenser inlet water chamber bypass via a filter inlet pipe. A manual and an electric inlet valve are installed on the filter inlet pipe. The filter outlet is connected to the condenser inlet water chamber bypass via a filter outlet pipe. An electric and a manual outlet valve are installed on the filter outlet pipe. The filter vent is connected to a wastewater tank via a top vent pipe. A top vent pipe is equipped with an electric and a manual vent valve. The filter backwash drain is connected to the wastewater tank via a backwash drain pipe. A backwash drain pipe is equipped with an electric and a manual backwash drain valve. The oxygen dosing system includes an oxygen tank. The outlet of the oxygen tank is connected to the bypass of the inlet water chamber of the unit's condenser via an oxygen dosing pipe. The oxygen dosing pipe is equipped with an oxygen flow monitoring device, an electric ball valve for oxygen dosing, an oxygen shut-off valve, and a pressure reducing valve at the outlet of the oxygen tank.

[0009] Furthermore, the filter inlet electric valve, filter outlet electric valve, filter top vent electric valve, filter backwash drain electric valve, oxygen dosing electric ball valve, and oxygen flow monitoring device are all connected to the control system.

[0010] Furthermore, the pH adjustment system includes a carbon dioxide storage tank. The outlet of the carbon dioxide storage tank is connected to the bypass of the inlet water chamber of the unit's condenser via a carbon dioxide injection pipe. The carbon dioxide injection pipe is equipped with a carbon dioxide flow monitoring device, a carbon dioxide injection electric ball valve, a carbon dioxide shut-off valve, and a carbon dioxide storage tank outlet pressure reducing valve. The carbon dioxide flow monitoring device and the carbon dioxide injection electric ball valve are connected to the control system.

[0011] This invention also provides an operation method for the above-mentioned multifunctional water purification system of indirect air-cooled circulating water system, the specific steps of which are as follows: The bypass flow monitoring device and water quality monitoring device continuously monitor the water volume, pH value, iron content, conductivity and dissolved oxygen of the indirect air-cooled circulating water, and transmit the measurement results to the control system. When the iron content detected by the control system exceeds the set value, the iron removal system is activated. When the pH value obtained by the control system exceeds the set value, the pH adjustment system is activated.

[0012] Furthermore, when the iron content obtained by the control system is <80μg / L, the risk level is normal and the iron removal system is shut down; when the iron content is ≤90μg / L, the risk level is low and the iron removal system is shut down; when the iron content is ≤95μg / L, the risk level is medium and the iron removal system is shut down; when the iron content is ≥100μg / L, the risk level is high and the iron removal system is turned on. When the pH value obtained by the control system is <7.0, the risk level is normal pH and the pH adjustment system is turned off; when 7.0 ≤ pH value < 8.0, the risk level is low pH and the pH adjustment system is turned off; when 8.0 ≤ pH value < 8.3, the risk level is medium pH and the pH adjustment system is turned off; when the pH value is ≥ 8.3, the risk level is high pH and the pH adjustment system is turned on.

[0013] Furthermore, when the control system controls the iron removal system to start, the control system obtains the iron content of the indirect air-cooled circulating water obtained by the water quality monitoring device and calculates the difference between it and the water quality control index to obtain the iron removal amount. The control system uses the amount of iron to be removed to determine the oxygen dosage for the iron removal system, calculated as follows:

[0014] In the formula, ΔFe represents the amount of oxygen added, ΔFe represents the amount of iron removed, and a represents the excess oxygen. For oxygen purity, For oxygen density, Where Q is the iron removal reaction efficiency, and Q is the bypass water treatment volume. This is the oxygenation rate control coefficient; When the iron removal rate is 0~15μg / L Take 1.4; When the iron removal rate is 20~30 μg / L Take 1.3; When the iron removal amount is above 30 μg / L Take 1.2.

[0015] Furthermore, when the control system controls the pH adjustment system to start, the control system obtains the pH value of the indirect air-cooled circulating water obtained by the water quality monitoring device and the set pH value water quality control index to obtain the pH adjustment range. The control system uses the pH adjustment range to determine the amount of carbon dioxide added to the pH adjustment system, calculated as follows:

[0016] In the formula, For carbon dioxide dosage, To monitor the pH value of indirect air-cooled circulating water, pH value is a water quality control indicator. For the purity of the added carbon dioxide, For the density of added carbon dioxide, Q represents the pH adjustment reaction efficiency for carbon dioxide, and Q represents the bypass water treatment volume. The carbon dioxide control coefficient, 44000, represents the amount of carbon dioxide required to adjust the pH value to 8.0 in the chemical reaction calculation. When the pH adjustment range is 0~1.0, Take 1.4; When the pH adjustment range is 1.0~1.5, Take 1.3; When the pH adjustment range is 1.5~2.0, Take 1.2; When the pH adjustment range is above 2.0, Take 1.1.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects: This invention proposes a multifunctional water purification system for an indirect air-cooled circulating water system. It integrates a water quality monitoring device, an iron removal system, a pH adjustment system, and a control system into a single, fully functional water purification system. The water quality monitoring device can acquire key water quality data such as pH value, iron content, conductivity, and dissolved oxygen of the indirect air-cooled circulating water in real time and transmit this data rapidly to the control system. Based on this data and preset operating control indicators, the control system intelligently regulates the operation of the iron removal system and the pH adjustment system, achieving precise control of the water purification process. This invention not only simplifies the system structure and reduces equipment space requirements but also significantly improves the system's operating efficiency and intelligence, making the water purification process more efficient and convenient.

[0018] Furthermore, the water quality monitoring devices in this invention, including pH monitoring devices, iron content monitoring devices, conductivity monitoring devices, and dissolved oxygen monitoring devices, are all high-precision equipment, ensuring the accuracy and reliability of the collected data. Based on this precise data and combined with risk level settings for different operating conditions, such as different risk ranges for iron content and pH value, the control system precisely controls the operation of the iron removal system and the pH adjustment system. For example, when the iron content reaches a high risk level, the iron removal system is activated promptly; when the pH value exceeds the set range, the pH adjustment system is quickly activated. This strictly controls the iron content and pH value in the indirect air-cooled circulating water within a reasonable range, effectively preventing corrosion and leakage of the indirect air-cooled radiator, extending the service life of the system equipment, and ensuring the safe and stable operation of the unit.

[0019] Furthermore, the system of this invention also possesses excellent scalability and remote monitoring capabilities. Its modular design makes the system easy to expand and maintain, allowing for flexible configuration and upgrades to adapt to different working environments and requirements. Simultaneously, the control system communicates with the host DCS via a communication module, enabling remote monitoring and data sharing. Maintenance personnel can monitor the system's operational status and water purification effect remotely in real time, promptly identifying and resolving problems, significantly improving operational efficiency, reducing maintenance costs, and providing strong support for the long-term stable operation of the system.

[0020] This invention proposes a multifunctional water purification system for an indirect air-cooled circulating water system. During operation, a bypass flow monitoring device and a water quality monitoring device continuously monitor the flow rate, pH value, iron content, conductivity, and dissolved oxygen of the incoming indirect air-cooled circulating water, transmitting the measurement results to the control system in real time. The control system quickly compares the acquired data with set values. When the iron content or pH value exceeds the set value, it immediately activates the corresponding iron removal system or pH adjustment system. This achieves rapid response and handling of water quality issues, avoiding the lag of manual monitoring and ensuring that the water quality remains consistently within acceptable limits.

[0021] When the iron removal system is activated, the control system accurately calculates the amount of iron removed. Based on the required iron content, and considering factors such as excess oxygen, oxygen purity, iron removal reaction efficiency, and bypass water volume, it precisely calculates the oxygen dosage using a specific formula. Simultaneously, it rationally selects the oxygen dosage adjustment coefficient according to different iron removal ranges. Similarly, when the pH adjustment system is activated, it accurately calculates the carbon dioxide dosage and selects an appropriate carbon dioxide dosage adjustment coefficient based on the pH adjustment range. This precise calculation and control method makes the dosage of oxygen and carbon dioxide more reasonable, improving the water purification effect and efficiency while reducing operating costs.

[0022] This invention strictly adheres to relevant standards and requirements, combining the iron and pH control requirements of DL / T 2295-2021 (without corrosion inhibitors), issuing warnings or activating corresponding systems for water quality adjustment. By controlling water quality indicators within a reasonable range, it effectively prevents corrosion and leakage of indirect air-cooled radiators, ensuring the safe and stable operation of the unit, and has high practical value and promotional significance. Attached Figure Description

[0023] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0024] Figure 1 This is a schematic diagram of the structure of a multifunctional water purification system for an indirect air-cooled circulating water system according to the present invention.

[0025] The components include: 1. Manual bypass valve for the condenser inlet water chamber; 2. Indirect air-cooled circulating water bypass pipe; 3. Booster pump inlet pipe; 4. Booster pump; 5. Booster pump outlet pipe; 6. Bypass flow monitoring device; 7. Bypass sampling pipe; 8. Bypass sampling solenoid valve; 9. pH monitoring device; 10. Iron content monitoring device; 11. Conductivity monitoring device; 12. Dissolved oxygen monitoring device; 13. Filter inlet pipe; 14. Filter inlet manual valve; 15. Filter inlet electric valve; 16. Filter; 17. Filter top vent pipe; 18. Filter top vent electric valve; 19. Filter top vent manual valve; 20. Filter outlet electric valve; 21. Filter outlet manual valve; 22. Filter outlet... 23. Water pipe; 24. Filter backwash drain pipe; 25. Filter backwash drain electric valve; 26. Filter backwash drain manual valve; 27. Oxygen dosing pipe; 28. Oxygen dosing electric ball valve; 29. ​​Oxygen shut-off valve; 30. Oxygen tank outlet pressure reducing valve; 31. Oxygen tank; 32. Carbon dioxide dosing pipe; 33. Carbon dioxide flow monitoring device; 34. Carbon dioxide dosing electric ball valve; 35. Carbon dioxide shut-off valve; 36. Carbon dioxide storage tank outlet pressure reducing valve; 37. Carbon dioxide storage tank; 38. Bypass outlet manual valve; 39. Filter bypass manual valve; 40. Filter bypass electric valve; 41. Wastewater tank; 42. Control system; 43. Booster pump bypass manual valve. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] Example 1 This embodiment is a multifunctional water purification system based on an indirect air-cooled circulating water system, such as... Figure 1As shown. This embodiment includes: 1. Manual bypass valve for the condenser inlet water chamber of the unit; 2. Indirect air-cooled circulating water bypass pipe; 3. Booster pump inlet pipe; 4. Booster pump; 5. Booster pump outlet pipe; 6. Bypass flow monitoring device; 7. Bypass sampling pipe; 8. Bypass sampling solenoid valve; 9. pH monitoring device; 10. Iron content monitoring device; 11. Conductivity monitoring device; 12. Dissolved oxygen monitoring device; 13. Filter inlet pipe; 14. Filter inlet manual valve; 15. Filter inlet electric valve; 16. Filter top vent pipe; 17. Filter top vent electric valve; 18. Filter top vent manual valve; 19. Filter outlet electric valve; 20. Filter outlet manual valve; 21. Filter outlet... 22. Pipeline; 23. Filter backwash drain pipe; 24. Filter backwash drain electric valve; 25. Filter backwash drain manual valve; 26. Oxygen dosing pipe; 27. Oxygen flow monitoring device; 28. Oxygen dosing electric ball valve; 29. ​​Oxygen shut-off valve; 30. Oxygen tank outlet pressure reducing valve; 31. Oxygen tank; 32. Carbon dioxide dosing pipe; 33. Carbon dioxide flow monitoring device; 34. Carbon dioxide dosing electric ball valve; 35. Carbon dioxide shut-off valve; 36. Carbon dioxide storage tank outlet pressure reducing valve; 37. Carbon dioxide storage tank; 38. Bypass outlet manual valve; 39. Filter bypass manual valve; 40. Filter bypass electric valve; 41. Wastewater tank; 42. Control system; 43. Booster pump bypass manual valve.

[0028] Water from the indirect air-cooled circulating water system bypass pipe 2 flows through electromagnetic sampling valve 8 and then through water quality monitoring device. The pH monitoring device 9, iron content monitoring device 10, conductivity monitoring device 11, and dissolved oxygen monitoring device 12 in the water quality monitoring device continuously monitor the water quality of the incoming water, and the measurement results are transmitted to control system 42. Water from the indirect cooling water bypass flows through bypass flow monitoring device 6 to continuously monitor the water volume of the incoming water, and the measurement results are transmitted to control system 42. The control system 42 issues online warnings based on the measurement results of the water quality monitoring device and controls the start and stop of the iron removal system (start and stop of the booster pump, filter and oxygen dosing system and dosage), and the start and stop of the pH adjustment system and dosage. The sampling tube 7 is connected to the water outlet, the filter top exhaust pipe 17 is connected to the air outlet, and the backwash drain pipe 23 is connected to the wastewater tank 41.

[0029] In this embodiment, the pH monitoring device 9 is a self-cleaning online pH monitoring instrument. The self-cleaning online pH monitoring instrument is equipped with a corrosion-resistant electrode, has an ultrasonic automatic cleaning function, a measurement range of 0~14, a measurement accuracy of ≤±0.05pH, an output signal of 4~20mA, and an electrode material of composite electrode.

[0030] In this embodiment, the iron content monitoring device 10 is an online iron analyzer with a measurement range of 0~500μg / L, an output signal of 4~20mA, and an electrode material of SS316L. In this embodiment, the conductivity monitoring device 11 is an online conductivity monitoring instrument with a measurement range of 0~50μs / cm, an output signal of 4~20mA, and a probe material of SS316L. In this embodiment, the dissolved oxygen monitoring device 12 is an online dissolved oxygen analyzer with a measurement range of 0~200μg / L, an output signal of 4~20mA, and an electrode material of SS316L+PVC film. In this embodiment, the bypass flow monitoring device 6 is an electromagnetic flowmeter with a measurement range of 0~200m. 3 / h, Output signal: 4~20mA, Electrode material: SS316L; In this embodiment, the oxygen flow monitoring device 27 and the carbon dioxide flow monitoring device 33 are vortex flow meters with a measurement range of 0~100 Nm. 3 / h, Output signal: 4~20mA, Body material: 304, Generator material: 304, Probe material: 304; In this embodiment, filter 16 is a multi-media filter with a water treatment capacity of 0~120m³. 3 / h, the packing material is quartz sand and manganese sand, and the filtration rate does not exceed 10m / h; In this embodiment, the control system 42 is equipped with a communication module, which can communicate with the host DCS via RS485, facilitating remote control and monitoring.

[0031] This invention integrates an indirect air-cooled circulating water quality monitoring device, an iron removal system, a pH adjustment system, and a control system, achieving online monitoring and intelligent control of indirect air-cooled circulating water quality and purification. The water quality monitoring device monitors the water quality data of the indirect air-cooled circulating water, while the control system acquires this data. When the iron content exceeds the standard, the oxygenation and iron removal system for the indirect air-cooled circulating water is activated, and the oxygenation amount is calculated in real time. When the pH exceeds the standard, the carbon dioxide-based pH-lowering system for the indirect air-cooled circulating water is activated, and the carbon dioxide dosage is calculated in real time. This integrated design makes the monitoring and water purification process more efficient and convenient, while also improving the system's intelligence level.

[0032] Furthermore, the pH monitoring device, iron content monitoring device, conductivity monitoring device, dissolved oxygen monitoring device, electromagnetic flowmeter, and vortex flowmeter used in the system of this invention are all high-precision monitoring devices, ensuring the accuracy and reliability of the data. The connection between these monitoring devices and the control system enables real-time data transmission and processing, providing a solid foundation for early warning of water quality anomalies and timely adjustment of oxygen and carbon dioxide dosages.

[0033] Furthermore, the control system in this invention communicates with the main DCS via a communication module, enabling remote monitoring and data sharing. This allows maintenance personnel to monitor the operational status and water purification effect of the indirect air-cooled circulating water system's multi-functional water purification system from a remote location in real time. Simultaneously, this remote monitoring method improves operational efficiency and reduces maintenance costs. In addition, the system's modular design makes it easy to expand and maintain, allowing for flexible configuration and upgrades according to actual needs.

[0034] Example 2 This embodiment is based on the multifunctional water purification system of an indirect air-cooled circulating water system described in Embodiment 1, and includes the following steps: 1) A small portion of the incoming water in the bypass water pipe 2 of the indirect air-cooled circulating water system passes through the electromagnetic sampling valve 8 and flows through the water quality monitoring device. The pH monitoring device 9, iron content monitoring device 10, conductivity monitoring device 11, and dissolved oxygen monitoring device 12 in the water quality monitoring device continuously monitor the quality of the incoming water and transmit the measurement results to the control system 42. 2) The incoming water from the intercooled water bypass is continuously monitored by the bypass flow monitoring device 6, and the measurement results are transmitted to the control system 42. 3) The control system 42 issues early warnings based on the measurement results of the water quality monitoring device, and controls the start and stop of the booster pump, the start and stop of the filter, the oxygen addition and dosage, and the carbon dioxide addition and dosage online; 4) When the iron content is <80μg / L, the risk level is normal, and the booster pump, filter, and oxygen dosing system are shut down; when the iron content is ≤90μg / L, the risk level is low risk, and the booster pump, filter, and oxygen dosing system are shut down; when the iron content is ≤95μg / L, the risk level is medium risk, and the booster pump, filter, and oxygen dosing system are shut down; when the iron content is ≥100μg / L, the risk level is high risk, and the booster pump, filter, and oxygen dosing system are turned on. 1) When pH < 7.0, the risk level is normal pH and the pH adjustment system is off; when 7.0 ≤ pH < 8.0, the risk level is low pH and the pH adjustment system is off; when 8.0 ≤ pH < 8.3, the risk level is medium pH and the pH adjustment system is off; when pH ≥ 8.3, the risk level is high pH and the pH adjustment system is on. 2) The iron content of the indirect air-cooled circulating water is collected by the real-time iron content monitoring device 10. Combined with the water quality control index (iron not exceeding 90 μg / L), the iron ΔFe that needs to be removed is calculated. Combined with relevant parameters, the real-time oxygen dosage is calculated. The formula for calculating (L / h) is as follows:

[0035] In the formula, ΔFe represents the amount of iron removed (μg / L), and a represents the excess oxygen (μg / L). For oxygen purity, For oxygen density, Where Q is the iron removal reaction efficiency and Q is the bypass treatment water volume (m³). 3 / h) The oxygenation rate control coefficient is 0.286, which is a theoretical coefficient calculated based on the chemical reaction formula for the oxidation of iron in water by oxygen; the obtained data are shown in Table 1.

[0036] Table 1

[0037] When the iron removal rate is 0~15μg / L Take 1.4; When the iron removal rate is 20~30 μg / L Take 1.3; When the iron removal amount is above 30 μg / L Take 1.2.

[0038] 1) The pH value of the indirect air-cooled circulating water is collected by the real-time pH monitoring device 9. When the pH value of the indirect air-cooled circulating water exceeds 8.3, the real-time carbon dioxide dosage is calculated based on the water quality control index (pH value not exceeding 8.0) and relevant parameters. The formula for calculating the dosage (L / h) is as follows:

[0039] In the formula, To monitor the pH value of indirect air-cooled circulating water, pH value is a water quality control indicator. For the purity of the added carbon dioxide, For the density of added carbon dioxide, Q represents the pH adjustment reaction efficiency for carbon dioxide, and Q represents the bypass water treatment volume (m³). 3 / h) The carbon dioxide control coefficient, 44000, represents the amount of carbon dioxide required to adjust the pH to 8.0 in the chemical reaction calculation, as shown in Table 2.

[0040] Table 2

[0041] When the pH adjustment range is 0~1.0, Take 1.4; When the pH adjustment range is 1.0~1.5, Take 1.3; When the pH adjustment range is 1.5~2.0, Take 1.2; When the pH adjustment range is above 2.0, Take 1.1.

[0042] In summary, this invention's system monitors the inlet water quality of the indirect air-cooled circulating water in real time. Based on the iron control requirements of DL / T2295-2021 (without corrosion inhibitors), it issues warnings or activates the booster pump, iron removal filter, and oxygen dosing system to remove iron from the indirect air-cooled circulating water. Based on the pH control requirements of DL / T 2295-2021 (without corrosion inhibitors), it issues warnings or activates the pH adjustment system to adjust the pH of the indirect air-cooled circulating water. It can accurately, efficiently, and promptly adjust the oxygen and carbon dioxide dosage, avoiding the lag caused by manual monitoring that leads to substandard water quality in the indirect air-cooled circulating water. It can control the iron content and pH of the indirect air-cooled circulating water within a reasonable range, preventing radiator corrosion and leakage, and ensuring the safe and stable operation of the unit.

[0043] Example 3 A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor executes the computer program to implement online monitoring and early warning of water quality in an indirect air-cooled circulating water system. For example, this includes acquiring the pH value of the indirect air-cooled circulating water from a pH monitoring device 9 and issuing an early warning; acquiring the iron content value of the indirect air-cooled circulating water from an iron content monitoring device 10 and issuing an early warning; acquiring the conductivity value of the indirect air-cooled circulating water from a conductivity monitoring device 11; acquiring the dissolved oxygen content of the indirect air-cooled circulating water from a dissolved oxygen monitoring device 12; when the iron content of the indirect air-cooled circulating water is ≥100 μg / L, the risk level is high iron risk, and the booster pump is activated, the filter is activated (electric valve 40 is closed, electric valve 15 is open), and the oxygen dosing system is activated (oxygen dosing electric ball valve 28 is open). Based on the water quality control index (iron not exceeding 90 μg / L), the required iron removal ΔFe is calculated, and based on relevant parameters, the real-time oxygen dosing amount M is calculated. O2 (m) 3 / h); When pH ≥ 8.3, the risk level is high risk, the pH adjustment system is activated (carbon dioxide dosing electric ball valve 34 is activated), and the real-time carbon dioxide dosage is calculated based on the water quality control index (pH not exceeding 8.0) and relevant parameters. (m) 3 / h); wherein, the memory may include main memory, such as high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device; the processor, network interface, and memory are interconnected via an internal bus, which may be an industry standard architecture bus, a peripheral component interconnection standard bus, an extended industry standard architecture bus, etc., and the bus may be divided into address bus, data bus, control bus, etc. The memory is used to store programs, specifically, the program may include program code, and the program code includes computer operation instructions. The memory may include main memory and non-volatile memory, and provides instructions and data to the processor.

[0044] This invention provides an operation method for a multifunctional water purification system in an indirect air-cooled circulating water system. The method includes the following steps: obtaining the water quality and flow rate of the indirect air-cooled circulating water bypass, including pH, iron, conductivity, and dissolved oxygen; issuing an early warning or activating the booster pump, iron removal filter, and oxygen dosing system to remove iron from the indirect air-cooled circulating water, in accordance with the iron control requirements of DL / T 2295-2021 (without corrosion inhibitors); issuing an early warning or activating the pH adjustment system to adjust the pH of the indirect air-cooled circulating water, in accordance with the pH control requirements of DL / T 2295-2021 (without corrosion inhibitors); and accurately, efficiently, and promptly adjusting the oxygen and carbon dioxide dosage based on the water flow and water quality control indicators, avoiding the lag caused by manual monitoring leading to substandard water quality in the indirect air-cooled circulating water, and controlling the iron content and pH of the indirect air-cooled circulating water within a reasonable range to prevent radiator corrosion and leakage, and ensure the safe and stable operation of the unit.

[0045] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A multifunctional water purification system for an indirect air-cooled circulating water system, characterized in that, A bypass flow monitoring device (6), a sampling device, an iron removal system, and a pH adjustment system are installed on the bypass of the condenser inlet water chamber of the unit. A water quality monitoring device is installed on the sampling device to detect the pH value, iron content, conductivity and dissolved oxygen of the indirect air-cooled circulating water. The iron removal system, pH adjustment system, water quality monitoring device and bypass flow monitoring device are all connected to the control system (42). The control system (42) is used to control the opening and closing of the iron removal system and pH adjustment system.

2. The multifunctional water purification system for an indirect air-cooled circulating water system according to claim 1, characterized in that, The unit condenser inlet water chamber is connected to the unit condenser inlet water chamber through the indirect air-cooled circulating water bypass pipe (2) to form the unit condenser inlet water chamber bypass. The indirect air-cooled circulating water bypass pipe (2) is equipped with a bypass flow monitoring device (6), a sampling device, an iron removal system, and a pH adjustment system.

3. The multifunctional water purification system for an indirect air-cooled circulating water system according to claim 2, characterized in that, The sampling device includes a bypass sampling pipe (7), and an indirect air-cooled circulating water bypass pipe (2) is connected to the inlet of the wastewater tank (41) through the bypass sampling pipe (7). A bypass sampling solenoid valve (8) and a water quality monitoring device are installed on the bypass sampling pipe (7). The water quality monitoring device includes a pH monitoring device (9), an iron content monitoring device (10), an electrical conductivity monitoring device (11), and a dissolved oxygen monitoring device (12), and the pH monitoring device (9), the iron content monitoring device (10), the electrical conductivity monitoring device (11), and the dissolved oxygen monitoring device (12) are connected to the control system (42).

4. The multifunctional water purification system for an indirect air-cooled circulating water system according to claim 1, characterized in that, The iron removal system includes a pressurization device, a filtration system, and an oxygen injection system. The filtration system filters out iron, and the oxygen injection system oxidizes iron ions in the indirect air-cooled circulating water. The booster device includes a booster pump (4) installed on the bypass of the condenser inlet water chamber of the unit. The booster pump (4) is connected to the bypass water of the condenser inlet water chamber of the unit through the booster pump inlet water pipe (3). The booster pump (4) is connected to the bypass flow monitoring device (6) through the booster pump outlet water pipe (5). The filtration system includes a filter (16). The inlet of the filter (16) is connected to the bypass of the condenser inlet water chamber of the unit through the filter inlet pipe (13). The filter inlet pipe (13) is equipped with a filter inlet manual valve (14) and a filter inlet electric valve (15). The outlet of the filter (16) is connected to the bypass of the condenser inlet water chamber of the unit through the filter outlet pipe (22). The filter outlet pipe (22) is equipped with a filter outlet electric valve (20) and a filter outlet manual valve (21). The exhaust port of the filter (16) is connected to the wastewater tank (41) through the filter top exhaust pipe (17). The filter top exhaust pipe (17) is equipped with a filter top exhaust electric valve (18) and a filter top exhaust manual valve (19). The backwash drain port of the filter (16) is connected to the wastewater tank (41) through the filter backwash drain pipe (23). The filter backwash drain pipe (23) is equipped with a filter backwash drain electric valve (24) and a filter backwash drain manual valve (25). The oxygen dosing system includes an oxygen tank (31). The outlet of the oxygen tank (31) is connected to the bypass of the inlet water chamber of the condenser of the unit through an oxygen dosing pipe (26). The oxygen dosing pipe (26) is equipped with an oxygen flow monitoring device (27), an oxygen dosing electric ball valve (28), an oxygen shut-off valve (29), and an oxygen tank outlet pressure reducing valve (30).

5. A multifunctional water purification system for an indirect air-cooled circulating water system according to claim 4, characterized in that, The filter inlet electric valve (15), filter outlet electric valve (20), filter top vent electric valve (18), filter backwash drain electric valve (24), oxygen dosing electric ball valve (28), and oxygen flow monitoring device (27) are all connected to the control system (42).

6. A multifunctional water purification system for an indirect air-cooled circulating water system according to claim 1, characterized in that, The pH adjustment system includes a carbon dioxide storage tank (37). The outlet of the carbon dioxide storage tank (37) is connected to the bypass of the inlet water chamber of the unit condenser through a carbon dioxide dosing pipe (32). The carbon dioxide dosing pipe (32) is equipped with a carbon dioxide flow monitoring device (33), a carbon dioxide dosing electric ball valve (34), a carbon dioxide shut-off valve (35), and a carbon dioxide storage tank outlet pressure reducing valve (36). The carbon dioxide flow monitoring device (33) and the carbon dioxide dosing electric ball valve (34) are connected to the control system (42).

7. The operation method of the multifunctional water purification system of the indirect air-cooled circulating water system according to any one of claims 1 to 6, characterized in that, The specific steps are as follows: The bypass flow monitoring device (6) and the water quality monitoring device continuously monitor the flow rate, pH value, iron content, conductivity and dissolved oxygen of the indirect air-cooled circulating water, and transmit the measurement results to the control system (42). When the iron content obtained by the control system (42) exceeds the set value, the iron removal system is turned on. When the pH value obtained by the control system (42) exceeds the set value, the pH adjustment system is turned on.

8. The operation method of a multifunctional water purification system for an indirect air-cooled circulating water system according to claim 7, characterized in that, When the iron content obtained by the control system (42) is <80μg / L, the risk level is normal and the iron removal system is closed; when the iron content is ≤90μg / L, the risk level is low and the iron removal system is closed; when the iron content is ≤95μg / L, the risk level is medium and the iron removal system is closed; when the iron content is ≥100μg / L, the risk level is high and the iron removal system is open. When the pH value obtained by the control system (42) is <7.0, the risk level is normal pH and the pH adjustment system is turned off; when 7.0≤pH value<8.0, the risk level is low pH and the pH adjustment system is turned off; when 8.0≤pH value<8.3, the risk level is medium pH and the pH adjustment system is turned off. When the pH value is ≥8.3, the risk level is high pH risk, and the pH adjustment system is activated.

9. The operation method of a multifunctional water purification system for an indirect air-cooled circulating water system according to claim 7, characterized in that, When the control system (42) controls the iron removal system to start, the control system (42) obtains the iron content of the indirect air-cooled circulating water obtained by the water quality monitoring device and calculates the difference between it and the water quality control index to obtain the amount of iron removed. The control system (42) uses the iron content to be removed to obtain the oxygen dosage of the iron removal system, and calculates it as follows: In the formula, ΔFe represents the amount of oxygen added, ΔFe represents the amount of iron removed, and a represents the excess oxygen. For oxygen purity, For oxygen density, Where Q is the iron removal reaction efficiency, and Q is the bypass water treatment volume. This is the oxygenation rate control coefficient; When the iron removal rate is 0~15μg / L Take 1.4; When the iron removal rate is 20~30 μg / L Take 1.3; When the iron removal amount is above 30 μg / L Take 1.

2.

10. The operation method of a multifunctional water purification system for an indirect air-cooled circulating water system according to claim 7, characterized in that, When the control system (42) controls the pH adjustment system to start, the control system (42) obtains the pH value of the indirect air-cooled circulating water obtained by the water quality monitoring device and the set pH value water quality control index to obtain the pH adjustment range. The control system (42) uses the pH adjustment range to obtain the amount of carbon dioxide added to the pH adjustment system, and calculates it as follows: In the formula, For carbon dioxide dosage, To monitor the pH value of indirect air-cooled circulating water, pH value is a water quality control indicator. For the purity of the added carbon dioxide, For the density of added carbon dioxide, Q represents the pH adjustment reaction efficiency for carbon dioxide, and Q represents the bypass water treatment volume (m³). 3 / h) The carbon dioxide control coefficient, 44000, represents the amount of carbon dioxide required to adjust the pH value to 8.0 in the chemical reaction calculation. When the pH adjustment range is 0~1.0, Take 1.4; When the pH adjustment range is 1.0~1.5, Take 1.3; When the pH adjustment range is 1.5~2.0, Take 1.2; When the pH adjustment range is above 2.0, Take 1.1.

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