A control method for plate heat exchangers

Abstract

This invention relates to the field of heat exchanger control technology, specifically to a control method for a plate heat exchanger. The invention includes: Step 1, acquiring the secondary network supply water pressure, return water pressure, and makeup water pressure through a data acquisition module, setting a data acquisition cycle, and periodically reading the acquired information from the acquisition module; Step 2, calculating the supply and return water pressure difference, and integrating the control of the plate heat exchanger with the heating system using an intelligent control system; Step 3, controlling the operating frequency of the secondary network circulating water pump and controlling the primary network electric regulating valve based on the supply and return water pressure difference and makeup water pressure; Step 4, using a temperature acquisition module to monitor the inlet and outlet water temperatures of the plate heat exchanger in real time. This invention uses makeup water pressure and temperature as two important factors as the core parameters for regulating the plate heat exchanger, achieving a significant improvement in the performance of the plate heat exchanger through precise control.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger control technology, and specifically to a control method for a plate heat exchanger. Background Technology

[0002] Plate heat exchangers are a new type of high-efficiency heat exchanger, consisting of a series of metal plates with a certain corrugated shape stacked together. Thin rectangular channels are formed between the various plates, and heat exchange occurs through the plates.

[0003] Application No. 201210093644.0 discloses a fluid distributor for a plate heat exchanger. The plate heat exchanger has a distribution hole (11) at a position corresponding to the refrigerant channel (202) for refrigerant to flow into the refrigerant channel (202). The fluid distributor includes a driving component (2) and an actuating component (3) that adjusts the opening size of the distribution hole (11) under the drive of the driving component (2). This plate heat exchanger can regulate the pressure and temperature of the refrigerant, ensuring that the refrigerant enters the heat exchange channel uniformly and improving the heat exchange stability of the plate heat exchanger. This invention also discloses a plate heat exchanger including the above-mentioned fluid distributor, and a control method for the plate heat exchanger, which have the same effects.

[0004] However, the patent only involves single pressure and temperature measurements and adjustment of the orifice size, without mentioning how to conduct long-term monitoring and optimization, or considering the impact of ambient temperature on the performance of the plate heat exchanger.

[0005] Therefore, it is necessary to provide a new technical solution to overcome the above-mentioned defects. Summary of the Invention

[0006] The purpose of this invention is to provide a control method for a plate heat exchanger that can effectively solve the above-mentioned technical problems.

[0007] To achieve the objectives of this invention, the following technical solution is adopted:

[0008] A control method for a plate heat exchanger includes: Step 1, collecting the secondary network supply water pressure, return water pressure, and makeup water pressure through a data acquisition module, setting the data acquisition cycle, and periodically reading the collected information from the data acquisition module;

[0009] Step 2: Calculate the supply and return water pressure difference, and use an intelligent control system to integrate the control of the plate heat exchanger with the heating system;

[0010] Step 3: Based on the supply and return water pressure difference and the makeup water pressure, control the operating frequency of the secondary network circulating water pump and control the primary network electric regulating valve;

[0011] Step 4: Use a temperature acquisition module to monitor the inlet and outlet water temperatures of the plate heat exchanger in real time;

[0012] Step 4.1: When the inlet water temperature of the heating system is lower than the set value, the controller starts the plate heat exchanger and adjusts the working mode of the heat exchanger to increase the inlet water temperature.

[0013] Step 4.2: When the outlet water temperature of the heating system is higher than the set value, the controller adjusts the working mode of the plate heat exchanger to reduce the outlet water temperature.

[0014] Step 4.3: When the inlet water temperature of the heating system is too high or the outlet water temperature is too low, the controller will issue an alarm and automatically stop the plate heat exchanger from working.

[0015] Step 4.4: The controller controls the temperature regulating valve to control the temperature;

[0016] Step 4.5: Determine whether the thermal efficiency of the heat exchanger has reached the expected target based on the monitoring results; if it has not reached the expected target, return to step 4.1.

[0017] Furthermore, step 1 includes the following steps:

[0018] Step 1.1: Set the data acquisition cycle according to the environment, and install the corresponding pressure acquisition modules on the water supply end, return end, and water supply pipeline to measure the secondary network water supply pressure, return pressure, and water supply pressure.

[0019] Step 1.2: Calculate the thermal efficiency of the plate heat exchanger using a heat conduction model based on the input parameters of the plate heat exchanger.

[0020] Step 1.3: Adjust the operating parameters of the plate heat exchanger based on the calculated thermal efficiency;

[0021] Step 1.4: Calculate the thermal efficiency of the adjusted plate heat exchanger;

[0022] Step 1.5: Compare and analyze the thermal efficiency before and after the adjustment.

[0023] Step 1.6: Output the comparison results.

[0024] Furthermore, step 2 includes the following steps:

[0025] Step 2.1: Use a pressure acquisition module to detect the pressure Pn in the cold water inlet pipe and the pressure Pi in the return water pipe of the plate heat exchanger;

[0026] Step 2.2: Calculate the pressure difference between the pressure Pn in each cold water inlet pipe and the pressure Pi in the return water pipe;

[0027] Step 2.3: Take the absolute value of each pressure difference value, use the error detection method to obtain the pressure difference value ΔP, and adjust the flow rate of the corresponding cold water inlet pipe according to the pressure difference value ΔP;

[0028] Step 2.4: After adjusting the operating parameters, verify the pressure difference value △P again using the same method until the pressure difference value △P between the pressure Pn of all cold water inlet pipes and the pressure Pi of the return water pipe is within the preset pressure difference range.

[0029] Step 2.5: Store the collected parameter data and the calculated differential pressure value ΔP in the database.

[0030] Furthermore, step 3 includes the following steps:

[0031] Step 3.1: The controller monitors the system's operating status in real time based on feedback from the pressure acquisition module. When the inlet water pressure of the heating system is lower than the set value, the controller controls the pressure regulating valve at the inlet end to increase the inlet water pressure. When the outlet water pressure of the heating system is higher than the set value, the controller controls the pressure regulating valve at the inlet end to reduce the outlet water pressure.

[0032] Step 3.2: When the inlet water pressure of the heating system is too high or the outlet water pressure is too low, the controller stops the plate heat exchanger from working and closes all solenoid valves.

[0033] Step 3.3: Determine whether the thermal efficiency of the plate heat exchanger has reached the expected target based on the monitoring results. If the expected target has not been reached, return to step 3.1 and continue to adjust the operating parameters of the plate heat exchanger; if the expected target has been reached, then the process ends.

[0034] Furthermore, step 3.3 includes the following steps:

[0035] Step 3.3.1: Set the threshold values ​​for the supply and return water pressure difference and the makeup water pressure, and install a pressure acquisition module to monitor the pressure difference value ΔP and the makeup water pressure Pb in real time;

[0036] Step 3.3.3: Adjust the opening of the electric regulating valve of the primary network according to the water supply pressure Pb and the actual situation of the primary network.

[0037] Furthermore, step 3.3.3 includes the following steps:

[0038] Step 3.3.3.1: Collect temperature information at different time periods;

[0039] Step 3.3.3.2: Adjust the opening of the primary network electric regulating valve according to the current ambient temperature;

[0040] Step 3.3.3.3: Collect ambient temperature information under different weather conditions;

[0041] Step 3.3.3.4: Based on the ambient temperature information under different weather conditions, preset different heat exchange modes;

[0042] Step 3.3.3.5: Combine the ambient temperature at different time periods and the ambient temperature under different weather conditions, and establish a learning model to predict future temperature changes and heat exchange demand;

[0043] Step 3.3.3.6: Store the heat exchange modes under different conditions in the database.

[0044] Furthermore, in step 3.3.3.4.1, the pressure difference value ΔP after adjusting the heat exchange mode is verified to ensure that the pressure difference value ΔP is within the threshold range;

[0045] Step 3.3.3.4.2: If the differential pressure value ΔP is not within the threshold range, return to step 3.1.

[0046] Furthermore, if the differential pressure value ΔP is still not within the threshold range after the preset number of adjustments, then manual maintenance will be notified.

[0047] Compared with the prior art, the present invention has the following beneficial effects: The present invention uses water pressure and temperature, two important factors, as the core parameters for regulating the plate heat exchanger. Through precise regulation, the performance of the plate heat exchanger is significantly improved. In addition, the present invention also introduces a verification process to confirm whether the regulation results meet the expected thermal efficiency target, thereby ensuring the reliability and accuracy of the regulation effect. Attached Figure Description

[0048] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0049] Figure 1 This is a schematic flowchart of a control method for a plate heat exchanger according to the present invention;

[0050] Figure 2 This is a flowchart illustrating step 4;

[0051] Figure 3 This is a flowchart illustrating step 3.3;

[0052] Figure 4 This is a flowchart of step 3.3.3. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0054] In the description of this invention, it should be understood that the terms "center," "lateral," "longitudinal," "front," "rear," "left," "right," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. When a component is referred to as being "fixed to" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. When a component is considered to be "set on" another component, it can be directly set on the other component or there may be an intermediate component at the same time. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0055] like Figures 1 to 4 As shown, the present invention provides a control method for a plate heat exchanger, comprising the following steps:

[0056] Step 1: Collect the secondary network water supply pressure, return water pressure, and makeup water pressure through the acquisition module, set the data acquisition cycle, and periodically read the collected information from the acquisition module; setting the data acquisition cycle and periodically reading the collected information from the acquisition module can ensure the accuracy of the data and the consistency of time, which is helpful for subsequent analysis and control.

[0057] Step 2: Calculate the supply and return water pressure difference. Use an intelligent control system to integrate the control of the plate heat exchanger with the heating system. Calculating the supply and return water pressure difference can reflect the operating status and heat load of the heating system. Using an intelligent control system to integrate the control of the plate heat exchanger with the heating system can achieve precise control of the heat exchanger and optimize the performance of the heating system.

[0058] Step 3: Based on the supply and return water pressure difference and the replenishment water pressure, control the operating frequency of the secondary network circulating water pump and control the primary network electric regulating valve; this linkage control can achieve energy saving and stable system operation; at the same time, it can also automatically adjust the system based on real-time monitoring data to keep the system in the best operating state at all times.

[0059] Step 4: Use a temperature acquisition module to monitor the inlet and outlet water temperatures of the plate heat exchanger in real time. This allows for real-time monitoring of the heat exchanger's thermal efficiency, and timely adjustments can be made to address any abnormal temperatures, preventing adverse effects on the system. Furthermore, analysis of the monitoring results enables continuous improvement and optimization of the system's performance.

[0060] Step 4.1: When the inlet water temperature of the heating system is lower than the set value, the controller starts the plate heat exchanger and adjusts the working mode of the heat exchanger to increase the inlet water temperature; this can ensure the stable operation of the heating system and avoid system instability or inefficiency caused by excessively low inlet water temperature.

[0061] Step 4.2: When the outlet water temperature of the heating system is higher than the set value, the controller adjusts the working mode of the plate heat exchanger to reduce the outlet water temperature; this can prevent the system from overloaded or the thermal efficiency from decreasing due to excessively high outlet water temperature.

[0062] Step 4.3: When the inlet water temperature of the heating system is too high or the outlet water temperature is too low, the controller will issue an alarm and automatically stop the plate heat exchanger from working; this can protect the heating system and the plate heat exchanger from damage caused by high or low temperatures, and at the same time avoid possible system failures.

[0063] Step 4.4: The controller controls the temperature regulating valve to control the temperature, thereby making the temperature regulation of the heating system more precise and timely, and ensuring the thermal efficiency and stability of the heating system.

[0064] Step 4.5: Determine whether the heat exchanger's thermal efficiency has reached the expected target based on the monitoring results. If the expected target has not been reached, return to step 4.1. Establishing a feedback mechanism allows the system to continuously optimize and maintain optimal performance. If the heat exchanger's thermal efficiency does not reach the expected target, it may be necessary to readjust the operating mode or perform other necessary maintenance to improve its performance. The cycle from step 4.1 to step 4.5 ensures the long-term, stable, and efficient operation of the plate heat exchanger.

[0065] Step 1 includes the following steps:

[0066] Step 1.1: Set the data acquisition cycle according to the environment, and install the corresponding pressure acquisition modules on the water supply end, return end, and water supply pipeline to measure the secondary network water supply pressure, return pressure, and water supply pressure; this allows for real-time acquisition of the heating system's pressure data, thereby monitoring the operating status of the heating system.

[0067] Step 1.2: Based on the input parameters of the plate heat exchanger, calculate the thermal efficiency of the plate heat exchanger using a heat conduction model, thereby evaluating the thermal efficiency in real time so as to identify and solve problems in a timely manner.

[0068] Step 1.3: Based on the calculated thermal efficiency, adjust the operating parameters of the plate heat exchanger to optimize its performance by adjusting the operation of the plate heat exchanger according to the real-time status of the system.

[0069] Step 1.4: Calculate the thermal efficiency of the adjusted plate heat exchanger. By evaluating the effect of the adjustment, the system can be further optimized.

[0070] Step 1.5: Compare and analyze the thermal efficiency before and after the adjustment; by evaluating the effect of the adjustment, determine whether the system performance has been improved.

[0071] Step 1.6: Output the comparison results. This allows operators to understand the effect of the optimization. If the optimization is successful, the new parameters can be used. If the optimization is unsuccessful, the optimization process may need to be repeated. At the same time, storing the comparison results in the database helps to accumulate optimization experience and provide a reference for future optimization work.

[0072] Step 2 includes the following steps:

[0073] Step 2.1: Use a pressure acquisition module to detect the pressure Pn of the cold water inlet pipe and the pressure Pi of the return pipe of the plate heat exchanger. This can obtain the pressure data of the cold water inlet pipe and the return pipe in real time, which helps to monitor the operating status of the heat exchanger.

[0074] Step 2.2: Calculate the pressure difference between the pressure Pn in each cold water inlet pipe and the pressure Pi in the return water pipe. This can reflect the heating efficiency of the heat exchanger and help optimize its performance.

[0075] Step 2.3: Take the absolute value of each pressure difference value, use the error detection method to obtain the pressure difference value ΔP, adjust the flow rate of the corresponding cold water inlet pipe according to the pressure difference value ΔP, and thus accurately adjust the flow rate of the cold water inlet pipe according to the feedback of the pressure difference value ΔP to ensure the stable operation of the heat exchanger.

[0076] Step 2.4: After adjusting the operating parameters, use the same method again to verify the pressure difference value △P until the pressure difference value △P between the pressure Pn of all cold water inlet pipes and the pressure Pi of the return water pipe is within the preset pressure difference range, thereby ensuring the accuracy of the adjustment effect and ensuring that the pressure of all cold water inlet pipes and the pressure of the return water pipe are within the preset range, thus ensuring the stable operation of the heat exchanger.

[0077] Step 2.5: Store the collected parameter data and the calculated differential pressure value ΔP in the database; this enables long-term data preservation and analysis, which helps to continuously optimize the performance of the heat exchanger; at the same time, this data can also be used for subsequent data analysis and fault diagnosis, improving the reliability and safety of the system.

[0078] Step 3 includes the following steps:

[0079] Step 3.1: The controller monitors the system's operating status in real time based on feedback from the pressure acquisition module. When the inlet water pressure of the heating system is lower than the set value, the controller controls the pressure regulating valve at the inlet end to increase the inlet water pressure. When the outlet water pressure of the heating system is higher than the set value, the controller controls the pressure regulating valve at the inlet end to reduce the outlet water pressure. By adjusting the system pressure in real time, the pressure can be kept stable, which helps to ensure the normal operation of the system and the stability of thermal efficiency.

[0080] Step 3.2: When the inlet water pressure of the heating system is too high or the outlet water pressure is too low, the controller stops the operation of the plate heat exchanger and closes all solenoid valves; thus, it can protect the system and plate heat exchanger in time when the system pressure is abnormal, and avoid damage to the system and equipment due to excessive pressure.

[0081] Step 3.3: Based on the monitoring results, determine whether the thermal efficiency of the plate heat exchanger has reached the expected target. If it has not reached the expected target, return to step 3.1 and continue to adjust the operating parameters of the plate heat exchanger. If it has reached the expected target, then end the process. This allows the system to self-optimize and adjust, ensuring that the thermal efficiency reaches the expected target.

[0082] Step 3.3.1: Set the threshold values ​​for the supply and return water pressure difference and the makeup water pressure, and install a pressure acquisition module to monitor the pressure difference value ΔP and the makeup water pressure Pb in real time, which helps to accurately determine the operating status of the system.

[0083] Step 3.3.2: Based on the monitored data, determine whether the current differential pressure ΔP and water replenishment pressure Pb are within the set threshold range;

[0084] If the differential pressure ΔP and the makeup water pressure Pb are both within the set threshold range, then the operating frequency of the secondary network circulating water pump remains unchanged.

[0085] If the pressure difference ΔP is lower than the set threshold, it indicates that the water flow in the secondary network may be insufficient, and the operating frequency of the secondary network circulating water pump needs to be increased.

[0086] If the pressure difference ΔP is higher than the set threshold, it indicates that the water flow in the secondary network may be too high, and the operating frequency of the secondary network circulating water pump needs to be reduced. By monitoring and adjusting the operating frequency of the secondary network circulating water pump in real time, the water flow of the system can be kept stable, which helps to optimize thermal efficiency.

[0087] Step 3.3.3: Based on the makeup water pressure Pb and the actual situation of the primary network, adjust the opening of the electric regulating valve of the primary network; by adjusting the valve opening, the flow rate and pressure of the primary network are adjusted, thereby optimizing the overall performance of the system. Automatic valve adjustment can ensure the stability and reliability of the system, and also improve the efficiency of the system.

[0088] Step 3.3.3.1: Collect temperature information at different time periods. By acquiring temperature data at different time periods, it is helpful to understand the temperature change trend and provide a reference for adjusting the opening of the primary network electric regulating valve.

[0089] Step 3.3.3.2: Adjust the opening of the electric regulating valve of the primary network according to the current ambient temperature; by adjusting the valve opening, the flow and pressure of the primary network are changed, thereby optimizing the overall performance of the system. Adjusting the valve according to the ambient temperature can ensure the stability and reliability of the system, and at the same time improve the efficiency of the system.

[0090] Step 3.3.3.3: Collect ambient temperature information under different weather conditions. By acquiring temperature data under different weather conditions, it is helpful to understand the impact of weather on temperature and provide a reference for preset different heat exchange modes.

[0091] Step 3.3.3.4: Based on the ambient temperature information under different weather conditions, preset different heat exchange modes. By presetting different heat exchange modes to cope with different weather conditions and temperature changes, it helps to improve the adaptability and flexibility of the system.

[0092] Step 3.3.3.5: Combine the ambient temperature at different time periods and under different weather conditions, and establish a learning model to predict future temperature changes and heat exchange demand. Predicting future temperature changes and heat exchange demand through the learning model helps to prepare the regulating valves in advance and further optimize the system performance.

[0093] Step 3.3.3.6: Store the heat exchange modes under different conditions in the database, which will help with subsequent data analysis and optimization.

[0094] Step 3.3.3.4.1: Verify the differential pressure value ΔP after adjusting the heat exchange mode to ensure that the differential pressure value ΔP is within the threshold range; this ensures that the adjusted differential pressure value ΔP meets the preset threshold range, which helps to ensure the stability and reliability of the system.

[0095] Step 3.3.3.4.2: If the differential pressure value ΔP is not within the threshold range, return to step 3.1; if the differential pressure value ΔP is still not within the threshold range after a preset number of adjustments, notify manual maintenance; timely correction and adjustment can be made when the differential pressure value ΔP is not within the preset threshold range, which helps to ensure the stability and reliability of the system performance; if the differential pressure value ΔP is still not within the threshold range after a preset number of adjustments, notify manual maintenance. This step can promptly notify manual maintenance when the system cannot automatically repair itself, which helps to ensure the long-term stable operation of the system.

[0096] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0097] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A control method for a plate heat exchanger, characterized in that, include: Step 1: Collect the secondary network water supply pressure, return water pressure, and makeup water pressure through the acquisition module, set the data acquisition cycle, and periodically read the collected information from the acquisition module; Step 2: Calculate the supply and return water pressure difference, and use an intelligent control system to integrate the control of the plate heat exchanger with the heating system; Step 3: Based on the supply and return water pressure difference and the makeup water pressure, control the operating frequency of the secondary network circulating water pump and control the primary network electric regulating valve; Step 4: Use a temperature acquisition module to monitor the inlet and outlet water temperatures of the plate heat exchanger in real time; Step 4.1: When the inlet water temperature of the heating system is lower than the set value, the controller starts the plate heat exchanger and adjusts the working mode of the heat exchanger to increase the inlet water temperature. Step 4.2: When the outlet water temperature of the heating system is higher than the set value, the controller adjusts the working mode of the plate heat exchanger to reduce the outlet water temperature. Step 4.3: When the inlet water temperature of the heating system is too high or the outlet water temperature is too low, the controller will issue an alarm and automatically stop the plate heat exchanger from working. Step 4.4: The controller controls the temperature regulating valve to control the temperature; Step 4.5: Determine whether the thermal efficiency of the heat exchanger has reached the expected target based on the monitoring results; if it has not reached the expected target, return to step 4.

1. Step 1 includes the following steps: Step 1.1: Set the data acquisition cycle according to the environment, and install the corresponding pressure acquisition modules on the water supply end, return end, and water supply pipeline to measure the secondary network water supply pressure, return pressure, and water supply pressure. Step 1.2: Calculate the thermal efficiency of the plate heat exchanger using a heat conduction model based on the input parameters of the plate heat exchanger. Step 1.3: Adjust the operating parameters of the plate heat exchanger based on the calculated thermal efficiency; Step 1.4: Calculate the thermal efficiency of the adjusted plate heat exchanger; Step 1.5: Compare and analyze the thermal efficiency before and after the adjustment. Step 1.6: Output the comparison results; Step 2 includes the following steps: Step 2.1: Use a pressure acquisition module to detect the pressure Pn in the cold water inlet pipe and the pressure Pi in the return water pipe of the plate heat exchanger; Step 2.2: Calculate the pressure difference between the pressure Pn in each cold water inlet pipe and the pressure Pi in the return water pipe; Step 2.3: Take the absolute value of each pressure difference value, use the error detection method to obtain the pressure difference value ΔP, and adjust the flow rate of the corresponding cold water inlet pipe according to the pressure difference value ΔP; Step 2.4: After adjusting the operating parameters, verify the pressure difference value △P again using the same method until the pressure difference value △P between the pressure Pn of all cold water inlet pipes and the pressure Pi of the return water pipe is within the preset pressure difference range. Step 2.5: Store the collected parameter data and the calculated differential pressure value ΔP in the database; Step 3 includes the following steps: Step 3.1: The controller monitors the system's operating status in real time based on feedback from the pressure acquisition module. When the inlet water pressure of the heating system is lower than the set value, the controller controls the pressure regulating valve at the inlet end to increase the inlet water pressure. When the outlet water pressure of the heating system is higher than the set value, the controller controls the pressure regulating valve at the inlet end to reduce the outlet water pressure. Step 3.2: When the inlet water pressure of the heating system is too high or the outlet water pressure is too low, the controller stops the plate heat exchanger from working and closes all solenoid valves. Step 3.3: Determine whether the thermal efficiency of the plate heat exchanger has reached the expected target based on the monitoring results. If the expected target has not been reached, return to step 3.1 and continue to adjust the operating parameters of the plate heat exchanger; if the expected target has been reached, then the process ends. Step 3.3 includes the following steps: Step 3.3.1: Set the threshold values ​​for the supply and return water pressure difference and the makeup water pressure, and install a pressure acquisition module to monitor the pressure difference value ΔP and the makeup water pressure Pb in real time; Step 3.3.2: Based on the monitored data, determine whether the current differential pressure ΔP and water replenishment pressure Pb are within the set threshold range; Step 3.3.3: Adjust the opening of the electric regulating valve of the primary network according to the water supply pressure Pb and the actual situation of the primary network.

2. The control method for a plate heat exchanger as described in claim 1, characterized in that, Step 3.3.3 includes the following steps: Step 3.3.3.1: Collect temperature information at different time periods; Step 3.3.3.2: Adjust the opening of the primary network electric regulating valve according to the current ambient temperature; Step 3.3.3.3: Collect ambient temperature information under different weather conditions; Step 3.3.3.4: Based on the ambient temperature information under different weather conditions, preset different heat exchange modes; Step 3.3.3.5: Combine the ambient temperature at different time periods and the ambient temperature under different weather conditions, and establish a learning model to predict future temperature changes and heat exchange demand; Step 3.3.3.6: Store the heat exchange modes under different conditions in the database.

3. The control method for a plate heat exchanger as described in claim 2, characterized in that, Step 3.3.3.4.1: Verify the differential pressure value ΔP after adjusting the heat exchange mode to ensure that the differential pressure value ΔP is within the threshold range; Step 3.3.3.4.2: If the differential pressure value ΔP is not within the threshold range, return to step 3.

1.

4. The control method for a plate heat exchanger as described in claim 3, characterized in that, If the differential pressure value ΔP is still not within the threshold range after the preset number of adjustments, then manual maintenance is notified.

Images