Plc-based air conditioner circulating water quality on-line detection and treatment system and method

Abstract

The application provides a PLC-based air conditioner circulating water quality on-line detection and treatment system and method, which comprises an electric control box, a PLC controller, a water injection pipeline, a water supplement tank, a water supplement pipeline, an air conditioner circulating water return pipeline, the water injection pipeline realizes automatic water injection to the water supplement tank under the control of the PLC controller, the water supplement pipeline realizes automatic water supplement to the air conditioner circulating water return pipeline under the control of the PLC controller, a heat pump unit and a first circulating water pump are connected in series on the air conditioner circulating water return pipeline, and the system further comprises a water quality multi-parameter on-line detector, an automatic dosing system, a cyclone decontamination system, an automatic degassing system and an ESEP alloy catalyst scale inhibitor. By using the system and method, on-line real-time detection of various water quality parameters can be realized, meanwhile, water quality is treated in real time according to the detection results, so that long-term stable operation of the entire air conditioning system can be effectively ensured.

Description

Technical Field

[0001] This invention relates to the field of clean combined heating and cooling technology, specifically to a PLC-based online detection and treatment system and method for air conditioning circulating water quality. Background Technology

[0002] New energy clean heating technologies offer significant energy savings, emission reductions, and economic benefits in projects such as coal-to-electricity conversion and centralized heating. However, they also have certain drawbacks. For example, in some office buildings, water circulation is typically used for heating. During this circulation process, the central air conditioning system primarily uses tap water, leading to scaling, corrosion, and biological sludge buildup. Without proper treatment, this can cause pipe blockages, corrosion leaks, and a significant reduction in heat transfer efficiency, all of which can disrupt the normal operation of the entire air conditioning system. Traditional treatment methods involve adding water quality stabilizers—including dispersants, scale inhibitors, corrosion inhibitors, and bactericides—to the water. This stabilizes scale-forming ions in the water. The main problem with system corrosion is dissolved oxygen corrosion. Carbon steel corrodes in water due to the formation of micro-cells. Added corrosion inhibitors, scale inhibitors, algaecides, and bactericides cannot remove oxygen from the water, thus failing to solve the corrosion problem. Furthermore, while traditional chemical dosing methods are effective, they cannot monitor water quality parameters in real time, cannot be centrally controlled, and cannot provide timely treatment, resulting in untimely water treatment and inaccurate dosage of chemicals. Summary of the Invention

[0003] The purpose of this invention is to provide a PLC-based online detection and treatment system and method for air conditioning circulating water quality. Using this system and method, centralized online real-time detection of various water quality parameters can be achieved. At the same time, the water quality can be processed in real time based on the detection results, thereby effectively ensuring the long-term stable operation of the entire air conditioning system.

[0004] The technical solution adopted by this invention to solve its technical problem is: a PLC-based online detection and treatment system for air conditioning circulating water quality, including an electrical control box, a PLC controller, a water injection pipeline, a water replenishment tank, a water replenishment pipeline, an air conditioning circulating water return pipeline, an online water quality multi-parameter analyzer, an automatic dosing system, a cyclone sludge removal system, an automatic degassing system, and an ESEP alloy catalyst scale inhibitor. The water injection pipeline, under the control of the PLC controller, automatically injects water into the water replenishment tank, and the water replenishment pipeline, under the control of the PLC controller, automatically replenishes water into the air conditioning circulating water return pipeline. A heat pump unit and a first circulating water pump are connected in series on the air conditioning circulating water return pipe. The automatic dosing system, under the control of a PLC controller, automatically adds chemicals to the water supply pipe. The vortex cleaning system is used to remove contaminants from the air conditioning circulating water. The automatic degassing system is used to degas the air conditioning circulating water. The online water quality multi-parameter analyzer is used to detect the pH, temperature, dissolved oxygen, salinity, and turbidity values ​​of the air conditioning circulating water. The PLC controller is electrically connected to the online water quality multi-parameter analyzer. The ESEP alloy catalyst scale inhibitor is connected in series on the air conditioning circulating water return pipe.

[0005] Preferably, the water injection pipeline includes a tap water pipe, a water softening treatment device, a first electrically controlled valve, and a first level gauge. The outlet end of the tap water pipe is connected to the interior of the water supply tank. The water softening treatment device and the first electrically controlled valve are connected in series on the tap water pipe along the water flow direction. The first level gauge is installed inside the water supply tank. The first level gauge and the first electrically controlled valve are electrically connected to the PLC controller.

[0006] Furthermore, the water supply pipeline includes a water supply pipe, a second electrically controlled valve, a second circulating water pump, a first check valve, a first manual valve, and a first pressure transmitter. The water supply pipe connects the water supply tank to the air conditioning circulating water return pipeline. The second electrically controlled valve, the second circulating water pump, the first check valve, and the first manual valve are connected in series along the water flow direction of the water supply pipe. The first pressure transmitter is installed on the air conditioning circulating water return pipeline. The second electrically controlled valve, the second circulating water pump, and the first pressure transmitter are electrically connected to the PLC controller.

[0007] Furthermore, the automatic dosing system includes a chemical tank, a dosing pipeline, a third electrically controlled valve, and a second level gauge. The dosing pipeline connects the chemical tank and the water supply pipeline, and the connection between the dosing pipeline and the water supply pipeline is located between the second electrically controlled valve and the second circulating water pump. The second level gauge and the third electrically controlled valve are electrically connected to the PLC controller.

[0008] Furthermore, the cyclone cleaning system includes a cyclone separator, a separator inlet pipe, a separator outlet pipe, a second manual valve, a third manual valve, and a fourth manual valve. The separator inlet pipe connects the separator's inlet to the air conditioning circulating water return pipe, and the separator outlet pipe connects the separator's clean water outlet to the air conditioning circulating water return pipe. The third manual valve is located on the air conditioning circulating water return pipe downstream of the connection between the separator inlet pipe and the return pipe. The second manual valve is located on the separator inlet pipe upstream of the connection between the separator outlet pipe and the return pipe. The fourth manual valve is located on the separator outlet pipe.

[0009] Furthermore, the automatic degassing system includes a degassing pipeline, a fifth manual valve, a filter, a fourth electrically controlled valve, a degassing tank, a third circulating water pump, a second check valve, and a sixth manual valve. The degassing pipeline is connected to the air conditioning circulating water return pipeline in a closed-loop manner. The fifth manual valve, filter, fourth electrically controlled valve, degassing tank, third circulating water pump, second check valve, and sixth manual valve are sequentially arranged on the degassing pipeline along the water flow direction. An exhaust valve and a third level gauge are installed on the degassing tank. The fourth electrically controlled valve, exhaust valve, third level gauge, and third circulating water pump are electrically connected to the PLC controller.

[0010] Furthermore, the combined probe of the online water quality multi-parameter analyzer for detecting temperature, dissolved oxygen, salinity, and turbidity is installed on the outlet pipe of the filter, and the pH probe of the online water quality multi-parameter analyzer for detecting pH value is installed on the return water pipe of the air conditioning circulating water system.

[0011] Furthermore, the system also includes a drainage pipeline, which includes a main drainage pipe, a first sewage pipe, a second sewage pipe, and a third sewage pipe. The inlet pipe of the main drainage pipe is connected to the overflow port of the water supply tank. The first sewage pipe connects the bottom of the water supply tank to the main drainage pipe. The second sewage pipe connects the bottom of the chemical tank to the main drainage pipe. The third sewage pipe connects the outlet of the cyclone separator to the main drainage pipe. A seventh manual valve, an eighth manual valve, and a fifth electrically controlled valve are respectively installed on the first, second, and third sewage pipes. The fifth electrically controlled valve is electrically connected to the PLC controller.

[0012] The present invention also provides a PLC-based online detection and treatment method for air conditioning circulating water quality, including the PLC-based online detection and treatment system for air conditioning circulating water quality according to claim 8, and further including the following operation control method: S1. Staff members check whether all relevant equipment in the system is in normal working condition. If any problems are found, they will be dealt with on-site in a timely manner. S2. Set the following thresholds on the touch screen of the electrical control box: water tank bottom limit threshold H1, water tank upper limit threshold H2, water pump stop level threshold H3, water pump start level threshold H4, water supply start pressure threshold P1, water supply stop pressure threshold P2, return water pipeline pH threshold PH1, and return water pipeline dissolved oxygen threshold DO. S3. The staff starts the online water quality monitoring and treatment system to bring it into normal working condition. In the normal working condition of the system, the PLC controller realizes the control method of automatic water replenishment of the water tank as follows: The PLC controller compares the water level value H5 monitored by the first level gauge with H1 in real time. When H5 > H1, no water filling operation is performed. When H5 ≤ H1, the PLC controller starts the first solenoid valve to start the water filling operation. During the water filling operation, the PLC controller compares H5 with H2 in real time. When H5 < H2, the water filling operation continues. When H5 ≥ H2, the water level in the water tank reaches the set value, the water filling operation stops, and the water filling process of the water tank is completed. The PLC controller implements automatic water replenishment control for the air conditioning circulating water system as follows: The PLC controller compares the return water pressure value P3 monitored by the first pressure transmitter with P1 in real time. When P3 > P1, no water replenishment is performed; when P3 ≤ P1, the PLC controller starts the second circulating water pump to begin water replenishment. During the water replenishment process, the PLC controller compares H5 with H3 in real time. When H5 > H3, it continues to compare H5 with H4. When H5 > H4, the water replenishment continues. During this water replenishment process, the PLC controller monitors the return water pressure value P3 in real time with P1. Comparing P3 and P2, if P3 ≥ P2, the water replenishment process is completed, and the PLC controller shuts off the second electrically controlled valve and the second circulating water pump. If P3 < P2, the water replenishment process continues. During the comparison of H5 and H4, if H5 ≤ H4, the PLC controller stops the second circulating water pump, thus pausing the water replenishment control until H5 > H4, at which point the subsequent water replenishment process resumes. During the comparison of H5 and H3, if H5 ≤ H3, the PLC controller shuts off the second electrically controlled valve and the second circulating water pump, stopping the water replenishment process. The PLC controller implements the automatic pH adjustment control method for air conditioning circulating water as follows: The PLC controller receives the pH value PH2 monitored by the online water quality multi-parameter detector in real time, and compares PH2 with PH1 in real time. When PH2 < PH1, the PLC controller starts the second circulating water pump and the third electric valve, and then shuts them off after the second circulating water pump and the third electric valve have been running for a certain period of time. After the second circulating water pump and the third electric valve have been shut down, the PLC controller compares the detected PH2 with PH1 again after a certain period of time. When PH2 is still less than PH1, the above process is repeated. When PH2 ≥ PH1, the PLC controller stops the second circulating water pump and the third electric valve, thereby completing the pH adjustment of the water flow in the return water pipeline. The PLC controller implements automatic adjustment and control of dissolved oxygen level in air conditioning circulating water as follows: The PLC controller receives the dissolved oxygen level DO1 monitored by the online water quality multi-parameter detector in real time and compares DO1 with DO in real time. When DO1 < DO, degassing is not performed; when DO1 ≥ DO, the PLC controller opens the fourth solenoid valve and the third circulating water pump to achieve degassing. During the continuous degassing process, the PLC controller compares the liquid level H6 in the degassing tank with the set minimum liquid level threshold H7 in real time. When H6 < H7, the third circulating water pump stops running. After a set time period, the third circulating water pump restarts. During the cycle of starting and stopping the third circulating water pump, when DO1 < DO, the PLC controller closes the fourth solenoid valve and the third circulating water pump to complete the degassing process.

[0013] The beneficial effects of this invention are as follows: The invention has a simple structure and is easy to manufacture; the system includes an automatic water replenishment system for the water tank, which ensures automatic water replenishment and guarantees water replenishment in the return water pipeline; the system includes an automatic chemical dosing system, which can perform real-time online chemical dosing based on water quality test results, thus achieving timely water treatment; the cyclone sludge removal system removes impurities from the return water pipeline, ensuring the cleanliness of the water flow; and the automatic deaeration system deaerates the water flow in the return water pipeline, reducing dissolved oxygen levels and consequently reducing corrosion of pipelines and equipment. The system utilizes an online multi-parameter water quality analyzer to monitor parameters such as dissolved oxygen and pH in real time. The PLC controller uses the results from this analyzer to control the automatic dosing and degassing systems, enabling timely online water treatment and improving water quality efficiency, thus ensuring the long-term normal operation of the entire air conditioning system. When using the automatic dosing system to adjust the pH in the return water pipeline, intermittent dosing is employed until the pH returns to the preset range. This dosing method ensures precise addition of chemicals, guaranteeing accurate pH adjustment. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some preferred embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the system structure of the present invention; Figure 2 This is a schematic diagram of the control principle of the present invention; Figure 3 Automatic water filling control logic diagram for the water tank; Figure 4 Logic diagram for automatic pressure replenishment control of return water pipeline; In the diagram: 1. PLC controller; 2. Water supply tank; 3. Softened water treatment device; 4. Chemical tank; 5. Cyclone separator; 6. Filter; 7. Deaeration tank; 8. ESEP alloy catalyst scale inhibitor; 9. Heat pump unit; 101. Tap water pipe; 102. Water supply pipe; 103. Chemical dosing pipe; 104. Separator inlet pipe; 105. Separator outlet pipe; 106. Deaeration pipe; 107. Air conditioning circulating water return pipe; 108. Main drainage pipe; 109. First sewage pipe; 110. Second sewage pipe; 111. Third sewage pipe; 112. Bypass pipe; 201. First circulating water pump; 202. Second circulating water pump; 203. Third circulating water pump; 301. First electrically controlled valve, 302 Second electrically controlled valve, 303 Third electrically controlled valve, 304 Fourth electrically controlled valve, 305 Fifth electrically controlled valve, 401 First manual valve, 402 Second manual valve, 403 Third manual valve, 404 Fourth manual valve, 405 Fifth manual valve, 406 Sixth manual valve, 407 Seventh manual valve, 408 Eighth manual valve, 409 Ninth manual valve, 501 First pressure transmitter, 502 Second pressure transmitter, 601 First level gauge, 602 Second level gauge, 603 Third level gauge, 701 Combined probe, 702 pH probe, 801 First check valve, 802 Second check valve, 901 Exhaust valve. Detailed Implementation

[0016] The following will describe specific embodiments and appendices. Figure 1-4 The technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the described embodiments are only some preferred embodiments of the present invention, and not all embodiments. Those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0017] This invention provides a PLC-based online detection and treatment system for air conditioning circulating water quality (e.g., Figure 1 (As shown), it includes an electrical control box, a PLC controller 1, a water injection pipeline, a water replenishment tank 2, a water replenishment pipeline, an air conditioning circulating water return pipeline 107, a multi-parameter online water quality analyzer, an automatic dosing system, a cyclone sludge removal system, an automatic degassing system, and an ESEP alloy catalyst scale inhibitor 8. The water injection pipeline, under the control of the PLC controller 1, automatically injects water into the water replenishment tank 2. The water replenishment tank 2, through the water injection pipeline, automatically injects water, ensuring a consistently stable water supply. The water replenishment pipeline, under the control of the PLC controller, automatically replenishes water into the air conditioning circulating water return pipeline 107. A heat pump unit 9 and a first circulating water pump 2 are connected in series on the air conditioning circulating water return pipeline 107. 01. The heat pump unit 9 is used to heat or cool the air conditioning circulating water. The first circulating water pump 201 circulates the water. The automatic dosing system, under the control of the PLC controller 1, automatically adds chemicals to the water supply pipeline. The automatic dosing system allows for real-time online adjustment of the pH value of the air conditioning circulating water. The cyclone cleaning system removes contaminants from the air conditioning circulating water. In practical applications, the cyclone cleaning system is always operational, ensuring real-time impurity removal and thus maintaining the cleanliness of the air conditioning circulating water. The automatic degassing system degasses the air conditioning circulating water, enabling the air conditioning circulating water to be degassed. The system performs real-time degassing, thereby enabling real-time online adjustment of dissolved oxygen levels in the air conditioning circulating water. The online multi-parameter water quality analyzer is used to detect the pH, temperature, dissolved oxygen, salinity, and turbidity values ​​of the air conditioning circulating water. The PLC controller 1 is electrically connected to the online multi-parameter water quality analyzer, which transmits the detected circulating water parameters to the PLC controller in real time. The ESEP alloy catalyst scale inhibitor 8 is connected in series on the air conditioning circulating water return pipe 107. Both the online multi-parameter water quality analyzer and the ESEP alloy catalyst scale inhibitor 8 are known mature technologies in the market; therefore, detailed descriptions of the online multi-parameter water quality analyzer and the alloy catalyst scale inhibitor 8 are not provided here. The detailed structure and working principle will not be described in detail. The ESEP alloy catalyst scale inhibitor 8 reduces the cation concentration in the water and changes the electrostatic potential by continuously releasing free electrons without changing the water composition and pH, thereby reducing the scaling index. In practical applications, the online multi-parameter water quality analyzer monitors the values ​​of various parameters of the air conditioning circulating water in real time, thereby realizing real-time online monitoring of the air conditioning circulating water. The PLC controller 1 uses the various water quality parameters fed back by the online multi-parameter water quality analyzer to realize the automatic operation control of the automatic dosing system and the automatic degassing system according to the set program, thereby realizing the timely and effective online treatment of the air conditioning circulating water, and thus effectively ensuring the long-term normal operation of the air conditioning system.

[0018] Based on the above embodiments, the specific implementation of the water injection pipeline is as follows: the water injection pipeline includes a tap water pipe 101, a water softening treatment device 3, a first electrically controlled valve 301, and a first level gauge 601. The water softening treatment device 3 is a known mature technology in this technical field; therefore, its specific structure and working principle will not be described in detail here. Its function is to soften the tap water and output softened water. The outlet end of the tap water pipe 101 is connected to the interior of the water supply tank 2. The water softening device 3... The first solenoid valve 301 and the first solenoid valve 301 are connected in series along the water flow direction in the water supply pipe 101. The first level gauge 601 is installed in the water supply tank 2. The first level gauge 601 can be used to monitor the liquid level in the water supply tank 2 in real time. The first level gauge 601 and the first solenoid valve 301 are electrically connected to the PLC controller 1. In practical applications, the PLC controller 1 uses the monitoring parameters of the first level gauge 601 to control the working state of the first solenoid valve 301 in real time, thereby realizing the automatic water supply control of the water supply tank 2. To improve the water supply stability of the water supply tank 2, a bypass pipe 112 is installed on one side of the first solenoid valve 301. A ninth manual valve 409 is installed on the bypass pipe 112. Under normal working conditions of the first solenoid valve 301, the ninth manual valve 409 is always closed. When the first solenoid valve 301 malfunctions and remains closed, the ninth manual valve 409 can be manually opened to replenish water to the water supply tank 2. Furthermore, to facilitate the monitoring of water pressure on the tap water pipe 101, a second pressure transmitter 502 is installed on the tap water pipe 101. The second pressure transmitter 502 is electrically connected to the PLC controller 1.

[0019] Based on the above embodiments, the specific implementation of the water replenishment pipeline is as follows: the water replenishment pipeline includes a water replenishment pipe 102, a second electrically controlled valve 302, a second circulating water pump 202, a first check valve 801, a first manual valve 401, and a first pressure transmitter 501. The water replenishment pipe 102 connects the water replenishment tank 2 with the air conditioning circulating water return pipe 107. The second electrically controlled valve 302, the second circulating water pump 202, the first check valve 801, and the first manual valve 401 run along the water replenishment pipe. Water flow direction is sequentially connected in series on water supply pipe 102. The first pressure transmitter 501 is installed on the air conditioning circulating water return pipe. The first pressure transmitter 501 realizes real-time monitoring of the air conditioning circulating water pressure. The second solenoid valve 302, the second circulating water pump 202 and the first pressure transmitter 501 are electrically connected to the PLC controller 1. When the water supply condition is met, the PLC controller 1 opens the second solenoid valve 302 and the second circulating water pump 202 to realize the replenishment of air conditioning circulating water.

[0020] Based on the above embodiments, the specific implementation of the automatic dosing system is as follows: The automatic dosing system includes a chemical tank 4, a dosing pipe 103, a third electrically controlled valve 303, and a second level gauge 602. The chemical tank 4 contains a chemical solution for adjusting the pH value of the air conditioning circulating water. The dosing pipe 103 connects the chemical tank 4 to the water supply pipe 102, and the connection between the dosing pipe 103 and the water supply pipe 102 is located between the second electrically controlled valve 302 and the second circulating water pump 202. The second level gauge 602 and the third electrically controlled valve 303 are electrically connected to the PLC controller 1. The second level gauge 602 is used to monitor the position of the chemical solution in the chemical tank 4 in real time to ensure the stability of the chemical supply. When the required dosing conditions are met, the PLC controller 1 starts the third electrically controlled valve 303 and the second circulating water pump 202 to realize the dosing process. Since the dosing process also realizes water replenishment, in this system, the PLC controller 1 does not simultaneously perform separate water replenishment and dosing processes.

[0021] Based on the above embodiments, the specific implementation of the cyclone cleaning system is as follows: The cyclone cleaning system includes a cyclone separator 5, a separator inlet pipe 104, a separator outlet pipe 105, a second manual valve 402, a third manual valve 403, and a fourth manual valve 404. The cyclone separator 5 is a mature technology product in this field; therefore, its working principle and structural composition will not be described in detail here. The separator inlet pipe 104 connects the inlet of the cyclone separator 5 to the air conditioning circulating water return pipe 107. The separator outlet pipe 105 connects the clean water outlet of the cyclone separator 5 to the air conditioning circulating water return pipe 107. The third manual valve 403 is installed on the air conditioning circulating water return pipe 107, and the third manual valve 403 is located at... Downstream of the connection between the inlet pipe 104 of the desander and the return pipe 107 of the air conditioning circulating water, the second manual valve 402 is located on the inlet pipe 104 of the desander and upstream of the connection between the outlet pipe 105 of the desander and the return pipe 107 of the air conditioning circulating water. The fourth manual valve 404 is located on the outlet pipe 105 of the desander. In actual application, the third manual valve 403 is closed, and the second and fourth manual valves 402 and 404 are open, so that the air conditioning water in the return pipe 107 of the air conditioning circulating water continuously passes through the cyclone desander 5, thereby completing the air conditioning water impurity removal and filtration. When the cyclone desander 5 has a problem and needs to be repaired, the third manual valve 403 is opened and the second and fourth manual valves 402 and 404 are closed.

[0022] Based on the above embodiments, the specific implementation of the automatic degassing system is as follows: The automatic degassing system includes a degassing pipe 106, a fifth manual valve 405, a filter 6, a fourth electrically controlled valve 304, a degassing tank 7, a third circulating water pump 203, a second check valve 802, and a sixth manual valve 406. The degassing pipe 106 is connected to the air conditioning circulating water return pipe 107 in a closed-loop manner, that is, air conditioning water can enter the degassing pipe 106 from the air conditioning circulating water return pipe 107, and then, after degassing, flow from the degassing pipe 106 back into the air conditioning circulating water return pipe 107. The fifth manual valve 405, filter 6, fourth electrically controlled valve 304, degassing tank 7, third circulating water pump 203, second check valve 802, and sixth manual valve 406 are sequentially arranged along the water flow direction of the degassing pipe 106. On channel 106, an exhaust valve 901 and a third level gauge 603 are installed on the degassing tank 7. The fourth solenoid valve 304, the third level gauge 603, and the third circulating water pump 203 are electrically connected to the PLC controller 1. In actual application, the fifth manual valve 405 and the sixth manual valve 406 are both in the open state, while the fourth solenoid valve 304 and the third circulating water pump 203 are in the closed state. When the conditions for degassing are met, the PLC controller 1 opens the third solenoid valve 304 and the third circulating pump 203. When the third circulating pump 203 is running, a negative pressure is formed in the degassing tank 7, causing the air conditioning circulating water to enter the degassing tank 7 in a splashing manner under the action of the negative pressure. At the same time, due to the existence of the negative pressure environment, the gas in the air conditioning circulating water is continuously released. The released gas is continuously discharged under the action of the exhaust valve 901, thereby realizing the degassing treatment of the air conditioning circulating water.

[0023] Based on the above embodiments, the specific implementation method of the online water quality multi-parameter analyzer for detecting the water quality of air conditioning circulating water is as follows: the combined probe 701 of the online water quality multi-parameter analyzer for detecting temperature, dissolved oxygen, salinity and turbidity is installed on the outlet pipe 105 of the filter. The combined probe 701 is composed of four probes: temperature probe, dissolved oxygen probe, salinity probe and turbidity probe. The pH probe 702 of the online water quality multi-parameter analyzer for detecting pH value is installed on the return water pipe 107 of the air conditioning circulating water. The combined probe 701 can be used to detect the temperature, dissolved oxygen, salinity and turbidity parameters of the air conditioning circulating water, and the pH value probe 702 can be used to detect the pH value parameter of the air conditioning circulating water. In practical applications, the online water quality multi-parameter analyzer transmits the obtained temperature, dissolved oxygen, salinity, turbidity and pH value parameters to the PLC controller 1. The PLC controller 1 uses the above parameters as control conditions to realize the automatic operation control of the automatic dosing system and the automatic degassing system according to the set program. The PLC controller 1 communicates with the online water quality multi-parameter analyzer through the RS485 interface.

[0024] Based on the above embodiments, to ensure the cleanliness of the water source provided by the water replenishment system, a drainage pipeline is also provided in this system. Specifically, the drainage pipeline includes a main drainage pipe 108, a first sewage pipe 109, a second sewage pipe 110, and a third sewage pipe 111. The inlet pipe of the main drainage pipe 108 is connected to the overflow port of the water replenishment tank 2, and the outlet end of the main drainage pipe 108 is connected to the ditch. Excess water from the water replenishment tank 2 can be discharged to the ditch through the main drainage pipe 108. The first sewage pipe 109 connects the bottom of the water replenishment tank 2 to the main drainage pipe 108. The second sewage pipe 110 connects the bottom of the medicine tank 4 to the main drainage pipe 108. The third sewage pipe 111 enables swirling flow. The drain outlet of the cyclone separator 5 is connected to the main drainage pipe 108. A seventh manual valve 407, an eighth manual valve 408, and a fifth electrically controlled valve 305 are respectively installed on the first drain pipe 109, the second drain pipe 110, and the third drain pipe 111. The fifth electrically controlled valve 305 is electrically connected to the PLC controller 1. The first drain pipe 109 can be used to discharge the sludge at the bottom of the water supply tank 2 into the ditch, thereby cleaning the water supply tank 2. The second drain pipe 110 can be used to discharge the sludge at the bottom of the chemical tank 4, thereby cleaning the chemical tank 4. The PLC controller 1 automatically controls the fifth electrically controlled valve 305 to achieve the periodic discharge of sludge at the bottom of the cyclone separator 5, thereby ensuring the cleaning quality of the cyclone separator 5.

[0025] This invention also provides a PLC-based online detection and treatment method for air conditioning circulating water quality, including the PLC-based online detection and treatment system for air conditioning circulating water quality described in the above embodiments, and further including the following operation control method: S1. Staff members check whether all relevant equipment in the system is in normal working condition. If any problems are found, they will be dealt with on-site in a timely manner. S2. Set the following thresholds on the touch screen of the electrical control box: water tank bottom limit threshold H1, water tank upper limit threshold H2, water pump stop level threshold H3, water pump start level threshold H4, water supply start pressure threshold P1, water supply stop pressure threshold P2, return water pipeline pH threshold PH1, and return water pipeline dissolved oxygen threshold DO. S3. The staff starts the online water quality detection and treatment system to bring it into normal working condition. In the normal working condition of the system, the PLC controller 1 controls the automatic water replenishment of the water tank 2 as follows: The PLC controller 1 compares the water level value H5 monitored by the first level gauge 601 with H1 in real time. When H5 > H1, no water filling operation is performed. When H5 ≤ H1, it means that the water level in the water tank 2 has reached the set minimum water level value. The PLC controller 1 starts the first electric control valve 301 to start the water filling operation. During the water filling operation, the PLC controller 1 compares H5 with H2 in real time. When H5 < H2, it means that the water level in the water tank 2 has not yet reached the upper limit. The water filling operation continues. When H5 ≥ H2, the water level in the water tank 2 reaches the set value, the water filling operation stops, and the water filling process of the water tank is completed. The automatic water replenishment control method for the air conditioning circulating water implemented by PLC controller 1 is as follows: PLC controller 1 compares the return water pressure value P3 monitored by the first pressure transmitter 501 with P1 in real time. When P3 > P1, no water replenishment operation is performed, indicating that the air conditioning circulating water pressure is normal. When P3 ≤ P1, PLC controller 1 starts the second circulating water pump 202 to begin water replenishment. This indicates that the air conditioning circulating water pressure is low and the water volume is insufficient, requiring water replenishment. During the water replenishment operation, PLC controller 1 compares H5 with H3 in real time. When H5 > H3, it continues to compare H5 with H4. When H5 > H4, the water replenishment operation continues. During this water replenishment process, PLC controller 1 compares P3 with P2 in real time. When P3 ≥ P2, the water replenishment operation is completed, and PLC controller 1 closes the second solenoid valve 302 and the second circulating water pump 202. When P3 < P2, the water replenishment operation continues. During the comparison of H5 and H4, when H5 ≤ H4, PLC controller 1 stops the operation of the second circulating water pump 202, thereby pausing the water replenishment control until H5 > H4, at which point the subsequent water replenishment process resumes. During the comparison of H5 and H3, when H5 ≤ H3, PLC controller 1 closes the second solenoid valve 302 and the second circulating water pump 202, stopping the water replenishment operation. The above operation control process can effectively avoid repeated start-stop phenomena of the second circulating water pump 202, thereby realizing the operation protection of the second circulating water pump 202.

[0026] The PLC controller implements automatic pH adjustment control for air conditioning circulating water as follows: PLC controller 1 receives the pH value PH2 monitored by the online water quality multi-parameter analyzer in real time and compares PH2 with PH1 in real time. When PH2 < PH1, PLC controller 1 starts the second circulating water pump 202 and the third electric valve 303, and then shuts them down after a certain period of operation. After the second circulating water pump 202 and the third electric valve 303 are shut down, PLC controller 1 compares the detected PH2 with PH1 again after a certain period of time. If PH2 is still less than PH1, the above process is repeated. Specifically, when the PH2 < PH1 condition is met, PLC controller 1 starts the second circulating water pump 202 and the third electric valve 303... After running for five minutes, the pump is shut down. Six hours after the second circulating water pump 202 and the third electric valve 303 are shut down, the PLC controller 1 continues to compare the detected pH 2 with pH 1. If the pH 2 < pH 1 condition is still met, the PLC controller 1 restarts the second circulating water pump and the third electric valve 303, running them for another five minutes. After stopping for six hours, the comparison of pH 2 and pH 1 is repeated until pH 2 ≥ pH 1. When pH 2 ≥ pH 1, the PLC controller stops the second circulating water pump 202 and the third electric valve 303, thus completing the pH adjustment of the water flow in the return water pipe. During the pH adjustment process, the second circulating water pump 202 and the third electric valve 303 are periodically started and stopped according to a set time cycle, thereby achieving multiple dosings and improving the accuracy of dosing.

[0027] The automatic adjustment and control method of dissolved oxygen level in air conditioning circulating water by PLC controller 1 is as follows: PLC controller 1 receives the dissolved oxygen level DO1 monitored by the online water quality multi-parameter detector in real time and compares DO1 with DO in real time. When DO1 < DO, degassing is not performed; when DO1 ≥ DO, PLC controller 1 opens the fourth solenoid valve 304 and the third circulating water pump 203 to achieve degassing. During the continuous degassing process, PLC controller 1 compares the liquid level H6 in degassing tank 7 with the set minimum liquid level threshold H7 in real time. When H6 < H7, the third circulating water pump 203 stops running. After a set time period, the third circulating water pump 203 restarts. During the cycle of starting and stopping the third circulating water pump 203, when DO1 < DO, PLC controller 1 closes the fourth solenoid valve 304 and the third circulating water pump 203 to complete the degassing process.

[0028] Except for the technical features described in the specification, all other technologies are known to those skilled in the art.

[0029] The preferred embodiments and examples of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments and examples. For those skilled in the art, several improvements and modifications can be made without departing from the concept of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A PLC-based online detection and treatment system and method for air conditioning circulating water quality, the system comprising an electrical control box, a PLC controller, a water injection pipeline, a water replenishment tank, a water replenishment pipeline, and an air conditioning circulating water return pipeline, wherein the water injection pipeline automatically injects water into the water replenishment tank under the control of the PLC controller, and the water replenishment pipeline automatically replenishes water into the air conditioning circulating water return pipeline under the control of the PLC controller, and a heat pump unit and a first circulating water pump are connected in series on the air conditioning circulating water return pipeline, characterized in that... The system also includes an online multi-parameter water quality analyzer, an automatic dosing system, a cyclone sludge removal system, an automatic degassing system, and an ESEP alloy catalyst scale inhibitor. The automatic dosing system, under the control of a PLC controller, automatically adds chemicals to the water supply pipeline. The cyclone sludge removal system removes contaminants from the air conditioning circulating water. The automatic degassing system degasses the air conditioning circulating water. The online multi-parameter water quality analyzer measures the pH, temperature, dissolved oxygen, salinity, and turbidity of the air conditioning circulating water. The PLC controller is electrically connected to the online multi-parameter water quality analyzer. The ESEP alloy catalyst scale inhibitor is connected in series on the air conditioning circulating water return pipeline. The water supply pipeline includes... The system includes a tap water pipe, a water softening device, a first electrically controlled valve, and a first level gauge. The outlet end of the tap water pipe is connected to the interior of the water supply tank. The water softening device and the first electrically controlled valve are connected in series along the water flow direction in the tap water pipe. The first level gauge is installed inside the water supply tank. The first level gauge and the first electrically controlled valve are electrically connected to the PLC controller. The water supply pipeline includes a water supply pipe, a second electrically controlled valve, a second circulating water pump, a first check valve, a first manual valve, and a first pressure transmitter. The water supply pipe connects the water supply tank to the air conditioning circulating water return pipeline. The second electrically controlled valve, the second circulating water pump, and the first... A check valve and a first manual valve are connected in series along the water flow direction of the water supply pipe. The first pressure transmitter is installed on the air conditioning circulating water return pipe. The second electrically controlled valve, the second circulating water pump, and the first pressure transmitter are electrically connected to the PLC controller. The automatic dosing system includes a chemical tank, a dosing pipe, a third electrically controlled valve, and a second level gauge. The dosing pipe connects the chemical tank to the water supply pipe, and the connection between the dosing pipe and the water supply pipe is located between the second electrically controlled valve and the second circulating water pump. The second level gauge and the third electrically controlled valve are electrically connected to the PLC controller. The cyclone separator system includes a cyclone separator, a separator inlet pipe, and a separator. The system includes an outlet pipe, a second manual valve, a third manual valve, and a fourth manual valve. The inlet pipe of the cyclone separator connects the inlet of the cyclone separator to the return water pipe of the air conditioning circulating water system. The outlet pipe of the cyclone separator connects the clean water outlet of the cyclone separator to the return water pipe of the air conditioning circulating water system. The third manual valve is located on the return water pipe of the air conditioning circulating water system and is downstream of the connection between the inlet pipe of the cyclone separator and the return water pipe of the air conditioning circulating water system. The second manual valve is located on the inlet pipe of the cyclone separator and is upstream of the connection between the outlet pipe of the cyclone separator and the return water pipe of the air conditioning circulating water system. The fourth manual valve is located on the outlet pipe of the cyclone separator.The automatic degassing system includes a degassing pipeline, a fifth manual valve, a filter, a fourth electrically controlled valve, a degassing tank, a third circulating water pump, a second check valve, and a sixth manual valve. The degassing pipeline is connected to the air conditioning circulating water return pipeline in a closed-loop manner. The fifth manual valve, filter, fourth electrically controlled valve, degassing tank, third circulating water pump, second check valve, and sixth manual valve are sequentially arranged on the degassing pipeline along the water flow direction. An exhaust valve and a third level gauge are installed on the degassing tank. The fourth electrically controlled valve, third level gauge, and third circulating water pump are electrically connected to the PLC controller. The online multi-parameter water quality analyzer, using a combined probe for detecting temperature, dissolved oxygen, salinity, and turbidity, is installed on the outlet pipeline of the separator. A pH probe for detecting pH values ​​is installed on the air conditioning circulating water return pipe. The system also includes a drainage pipe, which includes a main drainage pipe, a first sewage pipe, a second sewage pipe, and a third sewage pipe. The inlet pipe of the main drainage pipe is connected to the overflow port of the water supply tank. The first sewage pipe connects the bottom of the water supply tank to the main drainage pipe. The second sewage pipe connects the bottom of the chemical tank to the main drainage pipe. The third sewage pipe connects the outlet of the cyclone separator to the main drainage pipe. A seventh manual valve, an eighth manual valve, and a fifth electrically controlled valve are respectively installed on the first, second, and third sewage pipes. The fifth electrically controlled valve is electrically connected to the PLC controller. This processing method includes the following operation control methods: S1. Staff members check whether all relevant equipment in the system is in normal working condition, and deal with any problems in a timely manner. S2. Set the following thresholds on the touch screen of the electrical control box: water tank bottom limit threshold H1, water tank upper limit threshold H2, water pump stop level threshold H3, water pump start level threshold H4, water supply start pressure threshold P1, water supply stop pressure threshold P2, return water pipeline pH threshold PH1, and return water pipeline dissolved oxygen threshold DO. S3. The staff starts the online water quality monitoring and treatment system to bring it into normal working condition. In the normal working condition of the system, the PLC controller realizes the control method of automatic water replenishment of the water tank as follows: The PLC controller compares the water level value H5 monitored by the first level gauge with H1 in real time. When H5 > H1, no water filling operation is performed. When H5 ≤ H1, the PLC controller starts the first solenoid valve to start the water filling operation. During the water filling operation, the PLC controller compares H5 with H2 in real time. When H5 < H2, the water filling operation continues. When H5 ≥ H2, the water level in the water tank reaches the set value, the water filling operation stops, and the water filling process of the water tank is completed. The PLC controller implements automatic water replenishment control for the air conditioning circulating water system as follows: The PLC controller compares the return water pressure value P3 monitored by the first pressure transmitter with P1 in real time. When P3 > P1, no water replenishment is performed; when P3 ≤ P1, the PLC controller starts the second circulating water pump to begin water replenishment. During the water replenishment process, the PLC controller compares H5 with H3 in real time. When H5 > H3, it continues to compare H5 with H4. When H5 > H4, the water replenishment continues. During this water replenishment process, the PLC controller continuously monitors the return water pressure. When P3 is compared with P2, the water replenishment process is completed when P3 ≥ P2, and the PLC controller shuts off the second electrically controlled valve and the second circulating water pump. When P3 < P2, the water replenishment process continues. During the comparison of H5 and H4, when H5 ≤ H4, the PLC controller stops the second circulating water pump, thus pausing the water replenishment control until H5 > H4, at which point the subsequent water replenishment process resumes. During the comparison of H5 and H3, when H5 ≤ H3, the PLC controller shuts off the second electrically controlled valve and the second circulating water pump, stopping the water replenishment process. The PLC controller implements the automatic pH adjustment control method for air conditioning circulating water as follows: The PLC controller receives the pH value PH2 monitored by the online water quality multi-parameter detector in real time, and compares PH2 with PH1 in real time. When PH2 < PH1, the PLC controller starts the second circulating water pump and the third electric valve, and then shuts them off after the second circulating water pump and the third electric valve have been running for a certain period of time. After the second circulating water pump and the third electric valve have been shut down, the PLC controller compares the detected PH2 with PH1 again after a certain period of time. When PH2 is still less than PH1, the above process is repeated. When PH2 ≥ PH1, the PLC controller stops the second circulating water pump and the third electric valve, thereby completing the pH adjustment of the water flow in the return water pipeline. The PLC controller implements automatic adjustment and control of dissolved oxygen level in air conditioning circulating water as follows: The PLC controller receives the dissolved oxygen level DO1 monitored by the online water quality multi-parameter detector in real time and compares DO1 with DO in real time. When DO1 < DO, degassing is not performed; when DO1 ≥ DO, the PLC controller opens the fourth solenoid valve and the third circulating water pump to achieve degassing. During the continuous degassing process, the PLC controller compares the liquid level H6 in the degassing tank with the set minimum liquid level threshold H7 in real time. When H6 < H7, the third circulating water pump stops running. After a set time period, the third circulating water pump restarts. During the cycle of starting and stopping the third circulating water pump, when DO1 < DO, the PLC controller closes the fourth solenoid valve and the third circulating water pump to complete the degassing process.

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