Temperature control method for cooling circulating water system and cooling circulating water system

Abstract

Embodiments of the present application are applicable to the field of industrial control technology, and provide a temperature control method of a cooling circulating water system and the cooling circulating water system. The cooling circulating water system comprises a cooling device and a process equipment to be cooled connected to the cooling device through a circulating water pipeline, a reference temperature monitoring unit is installed on the circulating water pipeline, and the method comprises the following steps: determining a device outlet water temperature of a process equipment outlet; receiving a reference temperature collected by the reference temperature monitoring unit; correcting the device outlet water temperature based on the reference temperature to obtain a corrected outlet water temperature; and determining a control parameter of the cooling device according to the corrected outlet water temperature and controlling the cooling device according to the control parameter, so that an actual outlet water temperature of the process equipment is within a predetermined temperature range. By using the above method, the temperature of the cooling circulating water system can be finely adjusted.

Description

Technical Field

[0001] This application belongs to the field of industrial control technology, and in particular relates to a temperature control method and a cooling circulating water system for a cooling circulating water system. Background Technology

[0002] A cooling circulation water system is a water-cooling system widely used in industrial production and large buildings. Its core principle is to use water as a cooling medium, utilizing the flow of water in a closed or open circulation loop to continuously absorb and remove heat, thereby cooling the equipment or environment.

[0003] Taking the petrochemical industry as an example, manufacturers dedicated to the recycling and comprehensive utilization of petrochemical waste gas can use production systems to recover waste gas or byproducts emitted by petrochemical enterprises, such as carbon dioxide waste gas, liquid crude ammonia, industrial byproduct hydrogen, and syngas. Through purification, refining, and preparation processes, they can produce high-value-added products such as liquid carbon dioxide, dry ice, ammonia water, and high-purity hydrogen. In the operation of these production systems and the manufacturing process, cooling circulating water systems play a crucial role. By cooling various equipment within the production system through these systems, production safety and product quality can be guaranteed.

[0004] Precise temperature control is one of the core requirements for the operation of cooling water circulation systems. In the existing technology, temperature monitoring of cooling water circulation systems is mainly based on temperature monitoring units (such as thermometers) installed at the outlet of process equipment. Due to the limitations of installation conditions in industrial sites, the temperature data collected by the temperature monitoring units at the outlet of process equipment has a large error, which seriously affects the accuracy of temperature regulation of the cooling water circulation system. Summary of the Invention

[0005] In view of this, the present application provides a temperature control method and a cooling circulating water system for a cooling circulating water system. This method addresses the problem of large errors in temperature monitoring units that operate under harsh conditions for extended periods in the cooling circulating water system. It utilizes high-precision temperature anchor points in the middle of the circulating water pipes to correct the collected temperature data, thereby improving the accuracy of temperature measurement and ensuring the production safety of process equipment and product quality.

[0006] A first aspect of this application provides a temperature control method for a cooling circulating water system. The cooling circulating water system includes a cooling device and process equipment to be cooled, which is connected to the cooling device via a circulating water pipe. A reference temperature monitoring unit is installed on the circulating water pipe. The method includes: The water outlet temperature of the process equipment is determined by a temperature monitoring unit installed at the water outlet. Receive the reference temperature collected by the reference temperature monitoring unit; The corrected outlet water temperature is obtained by correcting the equipment outlet water temperature based on the reference temperature. The corrected outlet water temperature is used to represent the actual outlet water temperature after the cooling circulating water system cools the process equipment. Based on the corrected outlet water temperature, the control parameters of the cooling device are determined, and the cooling device is controlled according to the control parameters so that the actual outlet water temperature of the process equipment is within a predetermined temperature range.

[0007] Optionally, the step of correcting the device outlet water temperature based on the reference temperature to obtain the corrected outlet water temperature includes: Determine the pipe length between the installation location of the reference temperature monitoring unit and the water outlet, wherein the pipe length is the length from the water outlet to the installation location measured along the circulating water pipe; Calculate the heat dissipation of the circulating water pipe within the corresponding pipe length range; The outlet water temperature of the device is corrected based on the heat dissipation and the reference temperature to obtain the corrected outlet water temperature.

[0008] Optionally, the step of correcting the outlet water temperature of the device based on the heat dissipation and the reference temperature to obtain the corrected outlet water temperature includes: Construct a lumped-parameter thermodynamic model; Determine the multiple model parameters required to correct the outlet water temperature of the device; The corrected outlet water temperature is obtained by importing multiple model parameters and the reference temperature into the lumped parameter thermodynamic model for calculation. Specifically, the lumped-parameter thermodynamic model is as follows:

[0009] in, To correct the outlet water temperature, As the reference temperature, The density of the fluid inside the circulating water pipe. The specific heat capacity at constant pressure of the fluid. The volume of the circulating water pipe within the corresponding pipe length range. The mass flow rate of the fluid. dT / dt The rate of change of temperature over time. The overall heat transfer coefficient is... The outer surface area of ​​the pipe is the length of the pipe. The ambient temperature; This indicates the amount of heat dissipation.

[0010] Optionally, it also includes: The lumped parameter thermodynamic model is discretized; Multiple model parameters and the reference temperature are periodically acquired, and the multiple model parameters and the reference temperature are imported into the discretized lumped parameter thermodynamic model for calculation to obtain the corrected outlet water temperature; Specifically, the lumped-parameter thermodynamic model after discretization is as follows:

[0011] in, The reference temperature for the current cycle. This is the reference temperature for the previous cycle. The calculation period is specified.

[0012] Optionally, after receiving the reference temperature collected by the reference temperature monitoring unit, the method further includes: The system acquires the pre-temperature collected by the pre-temperature monitoring unit and the post-temperature collected by the post-temperature monitoring unit. The pre-temperature monitoring unit and the post-temperature monitoring unit are located on both sides of the installation position of the reference temperature monitoring unit on the circulating water pipeline. The reference temperature is calibrated based on the pre-temperature and the post-temperature; wherein the calibrated reference temperature is used to correct the outlet water temperature of the device.

[0013] Optionally, the pipe length between the installation positions of the pre-temperature monitoring unit and the post-temperature monitoring unit and the installation position of the reference temperature monitoring unit is equal to and less than a preset length value. The calibration of the reference temperature based on the pre-temperature and the post-temperature includes: The average value of the pre-temperature, the post-temperature, and the reference temperature is calculated as the calibrated reference temperature.

[0014] Optionally, determining the control parameters of the cooling device based on the corrected outlet water temperature includes: When the corrected outlet water temperature is greater than the equipment outlet water temperature and the temperature difference between the corrected outlet water temperature and the equipment outlet water temperature is greater than a preset temperature value, the number of fans operating in the cooling device is increased, and / or the operating power of the fans in the operating state is increased. If the corrected outlet water temperature is lower than the equipment outlet water temperature, reduce the number of fans operating in the cooling device, and / or reduce the operating power of the fans in operation.

[0015] A second aspect of this application provides a temperature control device for a cooling circulating water system. The cooling circulating water system includes a cooling device and process equipment to be cooled, which is connected to the cooling device via a circulating water pipe. A reference temperature monitoring unit is installed on the circulating water pipe. The temperature control device includes: The determination module is used to determine the equipment outlet water temperature at the outlet of the process equipment, which is acquired by a temperature monitoring unit installed at the outlet. The receiving module is used to receive the reference temperature collected by the reference temperature monitoring unit; The correction module is used to correct the outlet water temperature of the equipment based on the reference temperature to obtain the corrected outlet water temperature, which represents the actual outlet water temperature after the cooling circulating water system cools the process equipment. The control module is used to determine the control parameters of the cooling device based on the corrected outlet water temperature and control the cooling device according to the control parameters so that the actual outlet water temperature of the process equipment is within a predetermined temperature range.

[0016] A third aspect of this application provides a cooling circulating water system, including a control unit, a cooling device, and a process equipment to be cooled connected to the cooling device via a circulating water pipe. A reference temperature monitoring unit is installed on the circulating water pipe, and a temperature monitoring unit is installed at the outlet of the process equipment; wherein: The control unit is used to determine the equipment outlet water temperature at the outlet of the process equipment, receive the reference temperature collected by the reference temperature monitoring unit, correct the equipment outlet water temperature based on the reference temperature to obtain the corrected outlet water temperature, and determine the control parameters of the cooling device according to the corrected outlet water temperature. The cooling device is used to receive a control command carrying the control parameters issued by the control unit, and adjust its own parameters to be the same as the control parameters based on the instructions of the control command, so that the actual outlet water temperature of the process equipment is within a predetermined temperature range.

[0017] A fourth aspect of this application provides a control device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the control device performs the method as described in any one of the first aspects above.

[0018] A fifth aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a computer, implements the method as described in any one of the first aspects above.

[0019] A sixth aspect of this application provides a computer program product, including a computer program that, when run, causes the method described in any one of the first aspects to be executed.

[0020] Compared with the prior art, the embodiments of this application have the following beneficial effects: In this embodiment, the cooling circulating water system includes a cooling device and process equipment to be cooled, connected to the cooling device via circulating water pipes. A reference temperature monitoring unit is installed on the circulating water pipes to collect a reference temperature. Based on this, the outlet water temperature of the equipment can be corrected according to the reference temperature to obtain a corrected outlet water temperature. This corrected outlet water temperature can be used to represent the actual outlet water temperature of the process equipment after the cooling circulating water system has cooled it. Thus, the control unit can determine the control parameters of the cooling device based on the corrected outlet water temperature and control the cooling device according to the control parameters, ensuring that the actual outlet water temperature of the process equipment is within a predetermined temperature range. This improves the accuracy of temperature measurement and ensures the production safety and product quality of the process equipment.

[0021] The temperature control method and cooling circulating water system provided in this application embodiment can be applied to the petrochemical tail gas purification industry. That is, in the process of petrochemical tail gas circulation treatment and resource comprehensive utilization, the application of the above-mentioned cooling circulating water system and its corresponding temperature control method can significantly improve the temperature measurement accuracy in the petrochemical tail gas treatment process, reduce measurement and control errors, and ensure product quality. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of a cooling water circulation system provided in an embodiment of this application; Figure 2 This is a schematic diagram showing the arrangement of multiple temperature monitoring units on a circulating water pipe of a cooling circulating water system according to an embodiment of this application; Figure 3 This is a schematic diagram of a temperature control method for a cooling circulating water system provided in an embodiment of this application; Figure 4 This is a schematic diagram of a possible implementation of S303 in a temperature control method for a cooling circulating water system provided in an embodiment of this application; Figure 5This is a schematic diagram of a temperature control device for a cooling circulating water system provided in an embodiment of this application; Figure 6 This is a schematic diagram of a control device provided in an embodiment of this application. Detailed Implementation

[0024] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0025] Typically, industrial enterprises use contact-type temperature monitoring units installed at the outlet of process equipment to measure the temperature of the water discharged after cooling the equipment. However, because the process equipment outlet is constantly exposed to high temperature and humidity, the measurement accuracy of these monitoring units is poor, affecting the temperature control effect of the cooling water system. To address this issue, this application provides a temperature control method for cooling water systems. This method utilizes high-precision temperature anchor points in the middle of the circulating water pipes to correct the collected temperature data, improving the accuracy of temperature measurement and ensuring the production safety and product quality of the process equipment. The temperature control method provided in this application is applicable to cooling water systems in industries such as petrochemicals, coal chemicals, fine chemicals, power, metallurgy, and pharmaceuticals, and is particularly suitable for applications requiring high temperature measurement accuracy. For example, this method can be applied to cooling water systems in petrochemical tail gas purification and natural gas purification plant tail gas treatment scenarios.

[0026] The technical solution of this application will be described below through specific embodiments.

[0027] Reference Figure 1 The diagram shows a cooling circulating water system provided in an embodiment of this application. Specifically, it may include a control unit 101, a cooling device 102, and a process equipment 104 to be cooled connected to the cooling device 102 through a circulating water pipe 103. A reference temperature monitoring unit 1031 is installed on the circulating water pipe 103, and a temperature monitoring unit 1041 is installed at the outlet of the process equipment 104.

[0028] exist Figure 1 In the cooling water circulation system shown, the main circulation process begins at cooling device 102, and proceeds according to... Figure 1 As shown by the arrow, the water circulates to the cooling device 102. That is, water from the cooling device 102 is circulated by the water pump (…). Figure 1(Not shown) Water is pumped along the circulating water pipe 103 to the process equipment 104 to be cooled. During this process, the water flowing out of the cooling device 102 is at a relatively low temperature and is used to absorb heat from the process equipment 104. After cooling the process equipment 104 is complete, the water flows out from the outlet of the process equipment 104 and returns to the cooling device 102 through the circulating water pipe 103. During this process, the water flowing out of the process equipment 104 is at a relatively high temperature. Then, the cooling device 102 dissipates the heat brought back during the circulation process into the atmosphere. The entire circulation process of the cooling circulating water system is determined by monitoring the temperature indicated by the temperature monitoring unit 1041 at the outlet of the process equipment 104 to determine the cooling effect of the system. Since the outlet of the process equipment 104 is mostly a high-temperature and high-humidity environment, the temperature monitoring unit 1041 at this location often cannot provide accurate temperature measurement results.

[0029] Therefore, in this embodiment of the application, by installing a reference temperature monitoring unit 1031 on the circulating water pipe 103, the reference temperature monitored by the reference temperature monitoring unit 1031 can be used to correct the equipment outlet water temperature monitored by the temperature monitoring unit 1041 at the outlet of the process equipment 104, so as to obtain the corrected outlet water temperature. Thus, the corrected outlet water temperature represents the actual outlet water temperature of the cooling circulating water system after cooling the process equipment 104, and the cooling device 102 can be controlled accordingly.

[0030] like Figure 1 As shown, the control of the cooling device 102 can be implemented by a control unit 101. The control unit 101 can be an electronic device capable of data processing and command transmission and reception. This application embodiment does not limit the type of electronic device that can serve as the control unit 101. In one example of this application embodiment, Figure 1 The reference temperature monitoring unit 1031 and temperature monitoring unit 1041 can communicate with the control unit 101 via wired or wireless means, and this application embodiment does not limit this.

[0031] The aforementioned reference temperature monitoring unit 1031 can be a high-sensitivity temperature monitoring unit, such as a high-sensitivity temperature sensor. Its sensor probe should be inserted into the central region of the circulating water pipe 103, for example, at 1 / 3 to 1 / 2 of the pipe diameter, to ensure that the measured temperature is the fluid temperature, not the pipe wall temperature. In addition, the sensor and its connected short pipe should be properly insulated to avoid the influence of ambient temperature.

[0032] Based on the above introduction, Figure 1The control unit 101 can be used to determine the outlet water temperature of the process equipment 104, receive the reference temperature collected by the reference temperature monitoring unit 1031, and correct the outlet water temperature based on the reference temperature to obtain the corrected outlet water temperature. Based on this, the control unit 101 can determine the control parameters of the cooling device 102 according to the corrected outlet water temperature. The control parameters of the cooling device 102 may include the number of fans in operation and the operating power of each fan.

[0033] The control unit 101 can generate control commands based on determined control parameters and send them to the cooling device 102. Then, upon receiving the control commands carrying the control parameters from the control unit 101, the cooling device 102 adjusts its own parameters to match the received control parameters. For example, it can turn some fans on or off and adjust the operating power of the fans to the corresponding values. This allows adjustment of the outlet water temperature of the cooling device 102. Water at an appropriate temperature flows through the circulating water pipe 103 to the process equipment 104 and cools it, ensuring that the actual outlet water temperature of the process equipment 104 is within a predetermined temperature range. This predetermined temperature range can be a temperature range that meets the production requirements of the process products, for example, the temperature range required to recover tail gas or by-products emitted by petrochemical enterprises and produce high-value-added products such as liquid carbon dioxide, dry ice, ammonia, and high-purity hydrogen.

[0034] In implementing the technical solution of this application, the reference temperature collected by the reference temperature monitoring unit 1031 on the circulating water pipeline 103 is used to correct the outlet water temperature at the outlet of the process equipment 104 to be cooled, ensuring the accuracy of the reference temperature collected by the reference temperature monitoring unit 1031. In this embodiment, on the one hand, a temperature monitoring unit with high sensitivity can be used as the reference temperature monitoring unit 1031 to improve the reliability of the collected reference temperature; on the other hand, multiple temperature values ​​can be used to calibrate the reference temperature to further improve the accuracy of the reference temperature.

[0035] Specifically, such as Figure 2 The diagram shown is a schematic representation of the arrangement of multiple temperature monitoring units on a circulating water pipe of a cooling circulating water system according to an embodiment of this application. Figure 2 As shown, multiple high-sensitivity temperature monitoring units can be installed on the circulating water pipe 103. For example, Figure 2 The system includes a reference temperature monitoring unit 1031, a pre-temperature monitoring unit 1032, and a post-temperature monitoring unit 1033. It should be noted that the installation positions of the multiple temperature monitoring units mentioned in this embodiment are all located on the return water side of the circulating water pipe 103, that is, on the side of the pipe through which the heat-absorbing water flows from the process equipment 104 back to the cooling device 102.

[0036] In this embodiment of the application, the reference temperature monitoring unit 1031, the pre-temperature monitoring unit 1032 and the post-temperature monitoring unit 1033 should be installed in the middle straight pipe area of ​​the circulating water pipeline 103, and there should be a certain distance from the outlet of the process equipment 104, for example, greater than a certain distance value.

[0037] In one possible implementation of this application, the "middle section" described above can be a region ranging from 1 / 2 to 2 / 3 of the pipe length from the outlet, or it can be a region ranging from 1 / 3 to 1 / 2 of the pipe length from the outlet. Within this middle section, a suitable installation location for the reference temperature monitoring unit can be selected based on the actual layout of the circulating water pipes. This application does not limit this aspect.

[0038] If multiple temperature values ​​are needed to calibrate the reference temperature, the installation positions of the pre-temperature monitoring unit 1032 and the post-temperature monitoring unit 1033 can be made equidistant from the installation position of the reference temperature monitoring unit 1031. That is, the first distance between the installation position of the reference temperature monitoring unit 1031 and the installation position of the pre-temperature monitoring unit 1032 is equal to the second distance between the installation position of the reference temperature monitoring unit 1031 and the installation position of the post-temperature monitoring unit 1033. In this way, the calibrated reference temperature can be calculated based on the three temperature values ​​collected by the three temperature monitoring units. For example, the average of the three temperature values ​​can be calculated and used as the calibrated reference temperature.

[0039] In another example of this application's embodiments, there may be more than three temperature values ​​used for calibration reference temperature. For example, a greater number of high-sensitivity temperature monitoring units can be arranged on the circulating water pipe 103, and the average of the multiple temperature values ​​collected by the multiple temperature monitoring units can be used as the calibrated reference temperature. Considering the installation cost of the cooling water circulation system, this application's embodiments recommend using... Figure 2 The diagram shows a scheme that uses three temperature monitoring units to calibrate the reference temperature.

[0040] In this embodiment of the application, the equipment outlet temperature at the outlet of the process equipment 104 is corrected based on the reference temperature at a certain location on the circulating water pipe 103, which can be achieved based on the law of conservation of energy.

[0041] Specifically, for a given pipe, the entire pipe can be considered a thermodynamic system. For a liquid (such as water) flowing through the pipe, the heat required for the liquid to heat up should be equal to the heat brought in by the hotter liquid at the pipe inlet minus the heat carried away by the colder liquid at the pipe outlet, plus (or minus) the heat dissipated (or absorbed). In other words: the heat required for the water in the pipe to heat up = heat brought in by the hot water at the inlet - heat carried away by the cold water at the outlet ± heat dissipated / absorbed.

[0042] The above description can also be expressed as the following formula: ...(1) in, The water temperature at the pipe inlet is, that is... Figure 1 The water outlet temperature at the outlet of the 104 process equipment. The water temperature at the pipe outlet is, that is... Figure 1 The reference temperature collected by the reference temperature monitoring unit 1031 Let be the density of the fluid inside the pipe. The specific heat capacity at constant pressure of the fluid. For the volume of the pipe, The mass flow rate of the fluid. dT / dt The rate of change of temperature over time. The overall heat transfer coefficient is... The outer surface area over the length of the pipe. The ambient temperature. It also indicates the amount of heat dissipated or absorbed by the liquid as it flows through the pipe.

[0043] When correcting the outlet water temperature at the outlet of process equipment 104 using a reference temperature, the above formula can be converted to: ...(2) Right now: To correct the outlet water temperature, This is the reference temperature.

[0044] Furthermore, if we ignore the heat dissipation of the pipe, for example, if the pipe is short or the pipe has good insulation, we can let UA≈0, and then the above formula (2) can be expressed as: ... (3) In the above formula (3) / That is, the time it takes for the liquid to travel from the inlet to the outlet of the pipe.

[0045] On the other hand, under stable pipeline operating conditions, it can make dT / dt=0 Then, the above formula (2) can also be expressed as: ... (4) At this point, if the pipe insulation effect is good (i.e., UA≈0), then based on formula (4), we can obtain: This also means that under stable pipeline conditions and good insulation, the temperature at the pipeline inlet is equal to the temperature at the outlet or other intermediate points.

[0046] Therefore, in a cooling water circulation system, the temperature of the water flowing into the pipe can be deduced from the reference temperature collected by a high-sensitivity reference temperature monitoring unit installed on the return water side pipe. Figure 1 The actual outlet water temperature at the outlet of the 104 process equipment.

[0047] Based on the above introduction, and referring to Figure 3 The diagram illustrates a temperature control method for a cooling circulating water system according to an embodiment of this application. The method may specifically include the following steps: S301. Determine the water outlet temperature of the process equipment, wherein the water outlet temperature is obtained by a temperature monitoring unit installed at the water outlet.

[0048] It should be noted that this method can be applied to Figure 1 The cooling circulating water system shown is a cooling device and a process equipment to be cooled, connected to the cooling device via circulating water pipes. A reference temperature monitoring unit is installed on the circulating water pipes, and the reference temperature collected by the reference temperature monitoring unit is used to correct the outlet water temperature of the process equipment.

[0049] Furthermore, each step of the temperature control method provided in this application embodiment can be performed by... Figure 1 The control unit 101 in the system implements this method. That is, the subject executing this method can be a control unit connected to the cooling water circulation system. The control unit can be various forms of electronic equipment, and this application embodiment does not limit this.

[0050] exist Figure 1 In the cooling circulating water system shown, a temperature monitoring unit can be installed at the outlet of the process equipment. This unit can measure the temperature of the water discharged from the process equipment in real time, thus obtaining the equipment outlet water temperature. The water discharged from the process equipment can be cooling water pumped to the process equipment by the cooling device, which absorbs the heat generated by the process equipment and reaches a certain temperature. This water can flow back to the cooling equipment through the circulating water pipe on the return side. Therefore, the equipment outlet water temperature at the process equipment outlet can also be regarded as the inlet water temperature of the circulating water pipe on the return side.

[0051] Because the outlet of the process equipment is exposed to a high-temperature and high-humidity environment for extended periods, the outlet water temperature collected by the temperature monitoring unit at this location may be inaccurate. One of the objectives of this application is to correct for inaccurate outlet water temperatures, enabling the cooling circulating water system to obtain a more precise actual outlet water temperature.

[0052] S302, Receive the reference temperature collected by the reference temperature monitoring unit.

[0053] In this embodiment, the reference temperature can be obtained by a reference temperature monitoring unit installed in the middle section of the straight pipe of the circulating water pipeline on the return water side. This reference temperature monitoring unit can be a temperature monitoring unit with high sensitivity. As a specific example of this embodiment, the aforementioned temperature monitoring unit with high sensitivity can be a 1 / 3 DIN grade Pt100 temperature sensor or other similar temperature sensor. Exemplarily, a 1 / 3 DIN grade Pt100 temperature sensor can be installed in a straight pipe section 100 meters away from the outlet of the equipment, with an insertion depth of 100 mm, and the sleeve can be filled with thermally conductive silicone grease.

[0054] The reference temperature obtained by the reference temperature monitoring unit can be used to correct the outlet water temperature of the equipment in subsequent steps.

[0055] In one possible implementation of this application embodiment, in addition to the aforementioned reference temperature monitoring unit, other temperature monitoring units may be installed on the circulating water pipe on the return water side. For example, a pre-temperature monitoring unit and a post-temperature monitoring unit may be installed.

[0056] It should be noted that both the aforementioned pre-temperature monitoring unit and post-temperature monitoring unit are high-sensitivity temperature monitoring units, and their model and specifications can be the same as those of the aforementioned reference temperature monitoring unit. The pre-temperature monitoring unit and post-temperature monitoring unit can be located on either side of the reference temperature monitoring unit's installation position on the circulating water pipeline. Specifically, compared to the installation position of the reference temperature monitoring unit, the pre-temperature monitoring unit is installed closer to the process equipment outlet; while the post-temperature monitoring unit is installed farther from the process equipment outlet.

[0057] In one possible implementation of this application, the pre-temperature and post-temperature monitoring units can be used to calibrate the reference temperature. In this case, the pipe length between the installation positions of the pre-temperature monitoring units and the post-temperature monitoring units and the installation position of the reference temperature monitoring unit can be equal to and less than a preset length value.

[0058] In this way, after acquiring the pre-temperature from the pre-temperature monitoring unit and the post-temperature from the post-temperature monitoring unit, the reference temperature can be calibrated based on the pre-temperature and post-temperature. For example, the control unit can calculate the average of the pre-temperature, post-temperature, and reference temperature, and use this average as the calibrated reference temperature. The calibrated reference temperature can be used in subsequent steps to correct the device's outlet water temperature.

[0059] In another possible implementation of this application, the pre-temperature collected by the pre-temperature monitoring unit and the post-temperature collected by the post-temperature monitoring unit can also independently correct the device outlet water temperature. The device outlet water temperature corrected by the pre-temperature and / or post-temperature can be cross-validated with the device outlet water temperature corrected using the aforementioned reference temperature.

[0060] Specifically, in one example, the control device can calibrate a reference temperature using a pre-temperature and a post-temperature, and then use the calibrated reference temperature to correct the device's outlet water temperature.

[0061] In another example, the control device can use a reference temperature to correct the outlet water temperature, obtaining a corrected outlet water temperature, such as T1. Based on this, the control device can also use a pre-temperature or post-temperature to correct the outlet water temperature, obtaining another corrected outlet water temperature, such as T2. The method used by the control device to correct the outlet water temperature using the reference temperature, pre-temperature, or post-temperature should be the same. In this way, the corrected outlet water temperature T2 obtained using the pre-temperature or post-temperature correction can be cross-validated against the corrected outlet water temperature T1 obtained using the reference temperature to confirm the rationality and accuracy of the reference temperature correction.

[0062] In another example, the control device can correct the outlet water temperature using a reference temperature to obtain a corrected outlet water temperature, such as T1. Based on this, the control device can further correct the outlet water temperature using a pre-temperature and / or a post-temperature to obtain another one or two corrected outlet water temperatures, such as T2 and / or T3. The control device can then use the two or more corrected outlet water temperatures (i.e., T1, T2, and / or T3) obtained above to calculate the final corrected outlet water temperature. For example, the control device can calculate the average of the three corrected outlet water temperatures (i.e., T1, T2, and T3) and use this average as the corrected outlet water temperature.

[0063] S303. Based on the reference temperature, correct the outlet water temperature of the equipment to obtain the corrected outlet water temperature, which is used to represent the actual outlet water temperature after the cooling circulating water system cools the process equipment.

[0064] In this embodiment, the corrected outlet water temperature can be regarded as the actual water temperature at the outlet of the process equipment, that is, the actual outlet water temperature after the cooling circulating water system cools the process equipment.

[0065] Below, we will explain in detail how to use a reference temperature to correct the outlet water temperature of the equipment.

[0066] like Figure 4 As shown, in one possible implementation of this application embodiment, the corrected outlet water temperature is obtained by correcting the device outlet water temperature based on the reference temperature in step S303, which may specifically include the following steps S3031-S3033: S3031. Determine the pipe length between the installation location of the reference temperature monitoring unit and the water outlet.

[0067] First, the length of the pipe between the installation location of the reference temperature monitoring unit and the outlet of the process equipment can be determined. This pipe length can be the length measured along the circulating water pipe from the outlet of the process equipment to the installation location of the reference temperature monitoring unit.

[0068] It should be noted that when calibrating the reference temperature using the pre- and / or post-temperature monitoring units, or independently correcting the equipment outlet water temperature, it is also necessary to determine the pipe length between the installation location of the pre- and post-temperature monitoring units and the process equipment outlet. The required pipe length varies depending on the specific temperature monitoring unit used.

[0069] S3032. Calculate the heat dissipation of the circulating water pipe within the corresponding pipe length range.

[0070] The purpose of determining the pipe length is to calculate the heat dissipation within that pipe length range. Generally, considering heat dissipation (i.e., heat dissipation ≠ 0), the heat dissipation is positively correlated with the pipe length. That is, the longer the pipe, the greater the heat dissipation; the shorter the pipe, the smaller the heat dissipation.

[0071] In one possible implementation of this application, the heat dissipation of a liquid as it flows through a pipe of a certain length can be obtained through simulation in a laboratory.

[0072] In another possible implementation of this application embodiment, as described above, the heat dissipation can be expressed as... In the above expression The overall heat transfer coefficient is... The outer surface area of ​​the pipe is the length of the pipe. For ambient temperature, The reference temperature is used. Therefore, the overall heat transfer coefficient can also be determined by... The outer surface area of ​​the pipe length and ambient temperature and reference temperature To calculate the heat dissipation.

[0073] In this embodiment of the application, it is also possible to deduce the result from other values ​​even with zero data flow. The value of .

[0074] Specifically, for circulating water pipelines, the pipeline pump can be shut off to reduce the liquid flow rate in the pipeline to 0. Under these conditions, the curve of the reference temperature naturally decreasing over time, collected by the reference temperature monitoring unit, is recorded. Thus, the aforementioned formula (1) can be simplified to: ... (5) By calculating the slope of the above formula (5) using other relevant values, we can deduce the following: The value of is used to calculate the heat dissipation over the length of the pipe.

[0075] S3033. The outlet water temperature of the device is corrected according to the heat dissipation and the reference temperature to obtain the corrected outlet water temperature.

[0076] Given a determined heat dissipation range for the pipe length, the outlet water temperature can be corrected based on the calculated heat dissipation and the collected reference temperature to obtain the corrected outlet water temperature.

[0077] It should be noted that when using the pre-temperature or post-temperature independently to correct the equipment outlet water temperature, the heat dissipation should be calculated based on the pipe length corresponding to the pre-temperature monitoring unit that collects the pre-temperature or the post-temperature monitoring unit that collects the post-temperature, and the equipment outlet water temperature should be corrected based on the calculated heat dissipation and the corresponding pre-temperature or post-temperature.

[0078] In one possible implementation of this application, when the control unit corrects the outlet water temperature of the device based on the heat dissipation and the reference temperature, the entire pipeline can be regarded as a thermodynamic system. First, a lumped parameter thermodynamic model is constructed. By determining the multiple model parameters required to correct the outlet water temperature of the device, the multiple model parameters and the reference temperature can be imported into the lumped parameter thermodynamic model for calculation, thereby obtaining the corrected outlet water temperature.

[0079] The lumped-parameter thermodynamic model described above can be a mathematical model constructed based on the lumped-parameter method. The lumped-parameter method is a simplified method that ignores the internal temperature gradient of an object and concentrates the object's mass and heat capacity at a single point for unsteady-state heat conduction analysis. The lumped-parameter thermodynamic model can be expressed as: the heat required for the water in the pipe to heat up = the heat brought in by the inlet hot water - the heat taken out by the outlet cold water ± the heat dissipated / absorbed.

[0080] In this embodiment of the application, the lumped parameter thermodynamic model is specifically as follows: ... (6) in, To correct the outlet water temperature, As the reference temperature, The density of the fluid inside the circulating water pipe. The specific heat capacity at constant pressure of the fluid. This refers to the volume of the circulating water pipe within the corresponding pipe length range. The mass flow rate of the fluid. dT / dt The rate of change of temperature over time. The overall heat transfer coefficient is... The outer surface area of ​​the pipe is the length of the pipe. The ambient temperature; This indicates the amount of heat dissipated.

[0081] In the above formula (6), the outlet water temperature is corrected. The reference temperature is the final temperature value that needs to be calculated. The density of the fluid inside the circulating water pipe can be obtained by the reference temperature monitoring unit. and the specific heat capacity at constant pressure of the fluid. This can be determined by pre-testing the water discharged from the process equipment. Taking water as an example, the density of water... The specific heat capacity of water at constant pressure is approximately 1000 kg / m³. It is approximately 4186 J / (kg·°C).

[0082] Volume of circulating water pipe within the corresponding pipe length range and the outer surface area of ​​the pipe length This can be achieved by measuring the pipes beforehand. For example, the volume. It can be calculated by measuring the pipe length and the pipe cross-sectional area. The mass flow rate of the fluid can be directly obtained from a flow meter installed on the circulating water pipeline, along with the ambient temperature. It can be measured using an ambient temperature monitoring unit. How to measure it? The value of has been introduced in the previous steps and will not be repeated here.

[0083] In another possible implementation of this application embodiment, the outlet water temperature of the equipment can also be periodically corrected. To achieve the above objective, the lumped parameter thermodynamic model in formula (6) can be discretized, and multiple model parameters and reference temperatures can be periodically obtained. The multiple model parameters and reference temperatures can then be imported into the discretized lumped parameter thermodynamic model for calculation to obtain the corrected outlet water temperature.

[0084] In this way, the discretized lumped parameter method mathematical model can be transformed into a numerical calculation template that can be directly executed in PLC, DCS, or Excel. The discretized lumped parameter method mathematical model is an iterative recursive formula. By applying this recursive formula, the control unit does not need to solve complex differential equations; it only needs to perform a loop calculation once per second (or per minute) to complete the correction of the equipment's outlet water temperature.

[0085] For example, the discretized lumped parameter thermodynamic model is specifically as follows: ... (7) in, The reference temperature for the current cycle. This is the reference temperature for the previous cycle. The calculation period can be, for example, 1 second or 1 minute.

[0086] S304. Determine the control parameters of the cooling device based on the corrected outlet water temperature.

[0087] In this embodiment, the corrected outlet water temperature is the actual outlet water temperature at the process equipment outlet. If there is a difference between the actual outlet water temperature and the temperature monitored by the temperature monitoring unit at the outlet, the control parameters of the cooling device need to be adjusted.

[0088] Specifically, if the corrected outlet water temperature is greater than the equipment outlet water temperature and the temperature difference between the corrected outlet water temperature and the equipment outlet water temperature is greater than a preset temperature value, then the number of operating fans in the cooling device can be increased, and / or the operating power of the fans in operation can be increased. This process enhances the cooling effect of the cooling device and reduces the equipment outlet water temperature.

[0089] If the corrected outlet water temperature is lower than the equipment outlet water temperature, the number of fans operating in the cooling system can be reduced, and / or the operating power of the fans can be lowered. This reduces the cooling effect of the cooling system and prevents the equipment outlet water temperature from becoming too low.

[0090] S305. Control the cooling device according to the control parameters so that the actual outlet water temperature of the process equipment is within a predetermined temperature range.

[0091] This application addresses the issue that the temperature monitoring unit at the inlet of the circulating water pipeline (i.e., the outlet of the process equipment) is exposed to high temperature, high humidity, and vibration environments for extended periods, resulting in measurement drift and response lag, making it unsuitable for precise control and heat metering. To obtain the accurate inlet temperature, a reference temperature monitoring unit and a flow measurement point are added to the straight section of the circulating water pipeline. Combined with a thermodynamic model, the outlet water temperature at the process equipment outlet is corrected, improving the accuracy and precision of temperature measurement and enabling refined control of the cooling device.

[0092] The temperature control method provided in this application can be applied to petrochemical exhaust gas purification and cooling systems, solving the common industry problem of "inaccurate measurement, unstable control, and unclear detection" of the inlet temperature of refrigeration units.

[0093] It should be noted that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0094] Reference Figure 5 This illustration shows a schematic diagram of a temperature control device for a cooling circulating water system according to an embodiment of this application. The cooling circulating water system may include, for example: Figure 1 The various units, devices, and equipment shown are as follows. Specifically, the cooling circulating water system includes a cooling device and process equipment to be cooled, which is connected to the cooling device via circulating water pipes. A reference temperature monitoring unit is installed on the circulating water pipes. Figure 5 The temperature control device for the cooling circulating water system shown may specifically include a determining module 501, a receiving module 502, a correcting module 503, and a controlling module 504, wherein: The determination module 501 is used to determine the equipment outlet water temperature of the process equipment outlet, which is obtained by a temperature monitoring unit installed at the outlet water temperature. The receiving module 502 is used to receive the reference temperature collected by the reference temperature monitoring unit; The correction module 503 is used to correct the outlet water temperature of the equipment based on the reference temperature to obtain the corrected outlet water temperature, which represents the actual outlet water temperature after the cooling circulating water system cools the process equipment. The control module 504 is used to determine the control parameters of the cooling device based on the corrected outlet water temperature and control the cooling device according to the control parameters so that the actual outlet water temperature of the process equipment is within a predetermined temperature range.

[0095] In this embodiment of the application, the correction module 503 can specifically be used for: Determine the pipe length between the installation location of the reference temperature monitoring unit and the water outlet, wherein the pipe length is the length from the water outlet to the installation location measured along the circulating water pipe; Calculate the heat dissipation of the circulating water pipe within the corresponding pipe length range; The outlet water temperature of the device is corrected based on the heat dissipation and the reference temperature to obtain the corrected outlet water temperature.

[0096] In one possible implementation of this application embodiment, the correction module 503 may also be used for: Construct a lumped-parameter thermodynamic model; Determine the multiple model parameters required to correct the outlet water temperature of the device; The corrected outlet water temperature is obtained by importing multiple model parameters and the reference temperature into the lumped parameter thermodynamic model for calculation. Specifically, the lumped-parameter thermodynamic model is as follows:

[0097] in, To correct the outlet water temperature, As the reference temperature, The density of the fluid inside the circulating water pipe. The specific heat capacity at constant pressure of the fluid. The volume of the circulating water pipe within the corresponding pipe length range. The mass flow rate of the fluid. dT / dt The rate of change of temperature over time. The overall heat transfer coefficient is... The outer surface area of ​​the pipe is the length of the pipe. The ambient temperature; This indicates the amount of heat dissipation.

[0098] In another possible implementation of this application embodiment, the correction module 503 may also be used for: The lumped parameter thermodynamic model is discretized; Multiple model parameters and the reference temperature are periodically acquired, and the multiple model parameters and the reference temperature are imported into the discretized lumped parameter thermodynamic model for calculation to obtain the corrected outlet water temperature; Specifically, the lumped-parameter thermodynamic model after discretization is as follows:

[0099] in, The reference temperature for the current cycle. This is the reference temperature for the previous cycle. The calculation period is specified.

[0100] In this embodiment of the application, the receiving module 502 can also be used for: The system acquires the pre-temperature collected by the pre-temperature monitoring unit and the post-temperature collected by the post-temperature monitoring unit. The pre-temperature monitoring unit and the post-temperature monitoring unit are located on both sides of the installation position of the reference temperature monitoring unit on the circulating water pipeline. The reference temperature is calibrated based on the pre-temperature and the post-temperature; wherein the calibrated reference temperature is used to correct the outlet water temperature of the device.

[0101] In one possible implementation of this application embodiment, the pipe length between the installation positions of the pre-temperature monitoring unit and the post-temperature monitoring unit and the installation position of the reference temperature monitoring unit is equal to and less than a preset length value. The receiving module 502 can also be used for: The average value of the pre-temperature, the post-temperature, and the reference temperature is calculated as the calibrated reference temperature.

[0102] In this embodiment of the application, the control module 504 can specifically be used for: When the corrected outlet water temperature is greater than the equipment outlet water temperature and the temperature difference between the corrected outlet water temperature and the equipment outlet water temperature is greater than a preset temperature value, the number of fans operating in the cooling device is increased, and / or the operating power of the fans in the operating state is increased. If the corrected outlet water temperature is lower than the equipment outlet water temperature, reduce the number of fans operating in the cooling device, and / or reduce the operating power of the fans in operation.

[0103] This application provides a temperature control device for a cooling circulating water system. This device can be the electronic equipment described in the foregoing embodiments, for example... Figure 1 The control unit 101 shown, or other devices, units, apparatuses, etc., capable of implementing the functions related to the control unit 101. Using this apparatus, the various steps in the aforementioned method embodiments can be implemented.

[0104] As the apparatus embodiments are basically similar to the method embodiments, they are described in a relatively simple manner. For relevant details, please refer to the description in the method embodiment section.

[0105] Reference Figure 6 The diagram shows a schematic representation of a control device provided in an embodiment of this application. Figure 6As shown, the control device 600 in this embodiment includes: a processor 610, a memory 620, and a computer program 621 stored in the memory 620 and executable on the processor 610. When the processor 610 executes the computer program 621, it implements the steps in various embodiments of the temperature control method for the cooling circulating water system described above, for example... Figure 3 Steps S301 to S305 are shown. Alternatively, when the processor 610 executes the computer program 621, it implements the functions of each module / unit in the above-described device embodiments, for example... Figure 5 The functions of the determination module 501, receiving module 502, correction module 503, and control module 504 are shown.

[0106] For example, the computer program 621 can be divided into one or more modules / units, which are stored in the memory 620 and executed by the processor 610 to complete this application. The one or more modules / units can be a series of computer program instruction segments capable of performing specific functions, which can be used to describe the execution process of the computer program 621 in the control device 600. For example, the computer program 621 can be divided into a determining module, a receiving module, a correcting module, and a controlling module, with the specific functions of each module as follows: The determination module is used to determine the equipment outlet water temperature at the outlet of the process equipment, which is acquired by a temperature monitoring unit installed at the outlet. The receiving module is used to receive the reference temperature collected by the reference temperature monitoring unit; The correction module is used to correct the outlet water temperature of the equipment based on the reference temperature to obtain the corrected outlet water temperature, which represents the actual outlet water temperature after the cooling circulating water system cools the process equipment. The control module is used to determine the control parameters of the cooling device based on the corrected outlet water temperature and control the cooling device according to the control parameters so that the actual outlet water temperature of the process equipment is within a predetermined temperature range.

[0107] The control device 600 can be a device capable of implementing the steps in the aforementioned method embodiments, or it can be a device capable of implementing the functions related to the control unit in the aforementioned system embodiments. The control device 600 can be a desktop computer, a cloud server, or other similar devices. The control device 600 may include, but is not limited to, a processor 610 and a memory 620. Those skilled in the art will understand that… Figure 6This is merely one example of the control device 600 and does not constitute a limitation on the control device 600. It may include more or fewer components than shown, or combine certain components, or different components. For example, the control device 600 may also include input / output devices, network access devices, buses, etc.

[0108] The processor 610 can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor.

[0109] The memory 620 can be an internal storage unit of the control device 600, such as a hard disk or memory of the control device 600. The memory 620 can also be an external storage device of the control device 600, such as a plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, Flash Card, etc., equipped on the control device 600. Furthermore, the memory 620 can include both internal and external storage units of the control device 600. The memory 620 is used to store the computer program 621 and other programs and data required by the control device 600. The memory 620 can also be used to temporarily store data that has been output or will be output.

[0110] This application also discloses a control device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, it implements the methods described in the foregoing embodiments.

[0111] This application also discloses a computer-readable storage medium storing a computer program that, when executed by a computer, implements the methods described in the foregoing embodiments.

[0112] This application also discloses a computer program product, including a computer program that, when run on a computer, causes the computer to perform the methods described in the foregoing embodiments.

[0113] The embodiments described above are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A temperature control method for a cooling circulating water system, characterized in that, The cooling circulating water system includes a cooling device and process equipment to be cooled connected to the cooling device via circulating water pipes. A reference temperature monitoring unit is installed on the circulating water pipes. The method includes: The water outlet temperature of the process equipment is determined by a temperature monitoring unit installed at the water outlet. Receive the reference temperature collected by the reference temperature monitoring unit; The corrected outlet water temperature is obtained by correcting the equipment outlet water temperature based on the reference temperature. The corrected outlet water temperature is used to represent the actual outlet water temperature after the cooling circulating water system cools the process equipment. Based on the corrected outlet water temperature, the control parameters of the cooling device are determined, and the cooling device is controlled according to the control parameters so that the actual outlet water temperature of the process equipment is within a predetermined temperature range.

2. The method according to claim 1, characterized in that, The step of correcting the outlet water temperature of the device based on the reference temperature to obtain the corrected outlet water temperature includes: Determine the pipe length between the installation location of the reference temperature monitoring unit and the water outlet, wherein the pipe length is the length from the water outlet to the installation location measured along the circulating water pipe; Calculate the heat dissipation of the circulating water pipe within the corresponding pipe length range; The outlet water temperature of the device is corrected based on the heat dissipation and the reference temperature to obtain the corrected outlet water temperature.

3. The method according to claim 2, characterized in that, The step of correcting the outlet water temperature of the device based on the heat dissipation and the reference temperature to obtain the corrected outlet water temperature includes: Construct a lumped-parameter thermodynamic model; Determine the multiple model parameters required to correct the outlet water temperature of the device; The corrected outlet water temperature is obtained by importing multiple model parameters and the reference temperature into the lumped parameter thermodynamic model for calculation. Specifically, the lumped-parameter thermodynamic model is as follows: in, To correct the outlet water temperature, As the reference temperature, The density of the fluid inside the circulating water pipe. The specific heat capacity at constant pressure of the fluid. The volume of the circulating water pipe within the corresponding pipe length range. The mass flow rate of the fluid. dT / dt The rate of change of temperature over time. The overall heat transfer coefficient is... The outer surface area of ​​the pipe is the length of the pipe. The ambient temperature; This indicates the amount of heat dissipation.

4. The method according to claim 3, characterized in that, Also includes: The lumped parameter thermodynamic model is discretized; Multiple model parameters and the reference temperature are periodically acquired, and the multiple model parameters and the reference temperature are imported into the discretized lumped parameter thermodynamic model for calculation to obtain the corrected outlet water temperature; Specifically, the lumped-parameter thermodynamic model after discretization is as follows: in, The reference temperature for the current cycle. This is the reference temperature for the previous cycle. The calculation period is specified.

5. The method according to any one of claims 1 to 4, characterized in that, After receiving the reference temperature collected by the reference temperature monitoring unit, the method further includes: The system acquires the pre-temperature collected by the pre-temperature monitoring unit and the post-temperature collected by the post-temperature monitoring unit. The pre-temperature monitoring unit and the post-temperature monitoring unit are located on both sides of the installation position of the reference temperature monitoring unit on the circulating water pipeline. The reference temperature is calibrated based on the pre-temperature and the post-temperature; wherein the calibrated reference temperature is used to correct the outlet water temperature of the device.

6. The method according to claim 5, characterized in that, The pipe length between the installation positions of the pre-temperature monitoring unit and the post-temperature monitoring unit and the installation position of the reference temperature monitoring unit is equal to and less than a preset length value. The calibration of the reference temperature based on the pre-temperature and the post-temperature includes: The average value of the pre-temperature, the post-temperature, and the reference temperature is calculated as the calibrated reference temperature.

7. The method according to any one of claims 1 to 4 or 6, characterized in that, Determining the control parameters of the cooling device based on the corrected outlet water temperature includes: When the corrected outlet water temperature is greater than the equipment outlet water temperature and the temperature difference between the corrected outlet water temperature and the equipment outlet water temperature is greater than a preset temperature value, the number of fans operating in the cooling device is increased, and / or the operating power of the fans in the operating state is increased. If the corrected outlet water temperature is lower than the equipment outlet water temperature, reduce the number of fans operating in the cooling device, and / or reduce the operating power of the fans in operation.

8. A cooling circulating water system, characterized in that, The system includes a control unit, a cooling device, and process equipment to be cooled, which is connected to the cooling device via a circulating water pipeline. A reference temperature monitoring unit is installed on the circulating water pipeline, and a temperature monitoring unit is installed at the outlet of the process equipment. The control unit is used to determine the equipment outlet water temperature at the outlet of the process equipment, receive the reference temperature collected by the reference temperature monitoring unit, correct the equipment outlet water temperature based on the reference temperature to obtain the corrected outlet water temperature, and determine the control parameters of the cooling device according to the corrected outlet water temperature. The cooling device is used to receive a control command carrying the control parameters issued by the control unit, and adjust its own parameters to be the same as the control parameters based on the instructions of the control command, so that the actual outlet water temperature of the process equipment is within a predetermined temperature range.

9. A control device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it causes the control device to implement the method as described in any one of claims 1 to 7.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is run, the method as described in any one of claims 1 to 7 is performed.

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