Online monitoring method and monitoring system based on water content of evaporative cooling medium

Abstract

The invention provides an online monitoring method and monitoring system based on the water content of an evaporative cooling medium, relates to the technical field of monitoring of the water content of the evaporative cooling medium, and is applied to the online monitoring system based on the water content of the evaporative cooling medium. The monitoring system at least comprises a low-precision continuous detection subsystem comprising a sensor based on a dielectric constant method and a high-precision intermittent calibration subsystem comprising a Karl Fischer testing device. The monitoring method comprises the following steps: monitoring the moisture content of the evaporative cooling medium through the low-precision continuous detection subsystem, and acquiring first data corresponding to the moisture content of the evaporative cooling medium through the sensor; and under the condition that the first data characterizes that the moisture content of the evaporative cooling medium fluctuates abnormally, the high-precision intermittent calibration subsystem is started, the moisture content of the evaporative cooling medium is accurately measured through the Karl Fischer testing device, and automatic response and accurate calibration are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of monitoring the water content of an evaporative cooling medium, and specifically relates to an online monitoring method and monitoring system for the water content of an evaporative cooling medium. Background Art

[0002] The following problems exist during the operation of the evaporative cooling unit of a certain hydropower station's underground water turbine generator set: On the one hand, there is a certain risk of leakage of the evaporative cooling medium. The leaked medium of decafluoropentane (whose chemical formula is HFC4310) deposited in the wind tunnel will pose an asphyxiation risk; on the other hand, during the system maintenance, liquid addition and drainage, and operation exhaust processes, the moisture in the air will dissolve and "penetrate" into the HFC4310 medium, resulting in a change in the insulation performance of the cooling medium, which poses a challenge to the stable operation of the system. Summary of the Invention

[0003] The purpose of the present invention is to provide an online monitoring method and monitoring system for the water content of an evaporative cooling medium, which are used to solve technical problems such as excessive water content affecting the insulation performance of the cooling medium during the online monitoring of the water content of the evaporative cooling medium.

[0004] To achieve the above technical features, the purpose of the present invention is realized as follows: In the first aspect, the present invention provides an online monitoring method for the water content of an evaporative cooling medium, and the monitoring method is applied to an online monitoring system for the water content of an evaporative cooling medium; the monitoring system at least includes a low-precision continuous detection subsystem containing a sensor based on the dielectric constant method and a high-precision intermittent calibration subsystem containing a Karl Fischer test device; the monitoring method includes: Monitoring the water content of the evaporative cooling medium through the low-precision continuous detection subsystem, and obtaining first data corresponding to the water content of the evaporative cooling medium through the sensor; In the case where the first data indicates an abnormal fluctuation in the water content of the evaporative cooling medium, starting the high-precision intermittent calibration subsystem, and accurately measuring the water content of the evaporative cooling medium through the Karl Fischer test device.

[0005] Preferably, the sensor includes a capacitance sensor; the first data includes a moisture concentration; obtaining the first data corresponding to the water content of the evaporative cooling medium through the sensor includes: Determining a first capacitance value through the capacitance sensor based on the change in the water content of the evaporative cooling medium; Performing a conversion process on the first capacitance value to obtain a frequency signal corresponding to the first capacitance value; Determining the moisture concentration based on the frequency signal.

[0006] Preferably, the first data represents that the moisture content of the evaporative cooling medium shows abnormal fluctuations, including: When the moisture content of the evaporative cooling medium exceeds a preset range, it is determined that the first data represents that the moisture content of the evaporative cooling medium shows abnormal fluctuations.

[0007] Preferably, the Karl Fischer test device includes a Karl Fischer reagent supply module, a reaction cell, and an electrode module; the accurate determination of the moisture content of the evaporative cooling medium by the Karl Fischer test device includes: The Karl Fischer reagent is transported to the reaction cell through the Karl Fischer reagent supply module for reaction, and the current of the electrode module is monitored; the current is proportional to the moisture content of the evaporative cooling medium; Based on the current, the moisture content of the evaporative cooling medium is accurately determined.

[0008] Preferably, the Karl Fischer test device further includes a temperature and pressure compensation module, including: The change parameters of the temperature and pressure of the reaction cell are monitored in real time through the temperature and pressure compensation module; Based on the change parameters and a preset compensation algorithm, the result of the accurate determination of the moisture content of the evaporative cooling medium is corrected.

[0009] On the other hand, the present invention also provides an online monitoring system based on the water content of the evaporative cooling medium. The monitoring system includes a low-precision continuous detection subsystem containing a sensor based on the dielectric constant method, a high-precision intermittent calibration subsystem containing a Karl Fischer test device, and a water content online detection platform; the water content online detection platform is respectively connected to the low-precision continuous detection subsystem and the high-precision intermittent calibration subsystem; Among them, the low-precision continuous detection subsystem is used to monitor the moisture content of the evaporative cooling medium and obtain the first data corresponding to the moisture content of the evaporative cooling medium through the sensor; The water content online detection platform is used to start the high-precision intermittent calibration subsystem when the first data represents that the moisture content of the evaporative cooling medium shows abnormal fluctuations; The high-precision intermittent calibration subsystem is used to accurately determine the moisture content of the evaporative cooling medium through the Karl Fischer test device.

[0010] Preferably, the sensor includes a capacitance sensor; the first data includes the moisture concentration; The low-precision continuous detection subsystem is further configured to determine a first capacitance value based on the change in the moisture content of the evaporative cooling medium through the capacitance sensor; perform conversion processing on the first capacitance value to obtain a frequency signal corresponding to the first capacitance value; and determine the moisture concentration based on the frequency signal.

[0011] Preferably, the on-line moisture content detection platform is further configured to determine that the first data indicates abnormal fluctuations in the moisture content of the evaporative cooling medium when the moisture content of the evaporative cooling medium exceeds a preset range.

[0012] Preferably, the Karl Fischer test device includes a Karl Fischer reagent supply module, a reaction cell, and an electrode module. The high-precision intermittent calibration subsystem is further configured to transport the Karl Fischer reagent to the reaction cell through the Karl Fischer reagent supply module for reaction, and monitor the current of the electrode module; the current is proportional to the moisture content of the evaporative cooling medium; and accurately measure the moisture content of the evaporative cooling medium based on the current.

[0013] Preferably, the Karl Fischer test device further includes a temperature and pressure compensation module. The temperature and pressure compensation module is configured to monitor the change parameters of the temperature and pressure of the reaction cell in real time; and correct the result of accurately measuring the moisture content of the evaporative cooling medium based on the change parameters and a preset compensation algorithm.

[0014] The present invention has the following beneficial effects: 1. High-precision monitoring: Adopting the Karl Fischer coulometry measurement principle and combining with high-precision intermittent calibration technology, it can realize rapid and high-precision on-line monitoring of micro water in the evaporative cooling medium, with high measurement accuracy and good repeatability, providing accurate data support for the insulation performance evaluation of the cooling medium.

[0015] 2. High reliability: The system consists of multiple modules, and the modules cooperate with each other and work together to ensure the high reliability of the monitoring device.

[0016] 3. Real-time alarm function: It has a real-time alarm function, and when the monitored moisture content exceeds the set alarm threshold, it can immediately send out an alarm signal.

[0017] 4. Data transmission and centralized monitoring: It outputs monitoring data and alarm information using a general communication protocol such as RS485, which is convenient for seamless docking with the existing power monitoring system to realize remote transmission and centralized monitoring of data. Description of the Drawings

[0018] The present invention will be further described below in conjunction with the drawings and embodiments.

[0019] Figure 1 Schematic flow diagram of an online monitoring method for the water content of an evaporation cooling medium provided by an embodiment of the present invention.

[0020] Figure 2 Schematic diagram of the framework of an online monitoring system for the water content of decafluoropentane provided by an embodiment of the present invention.

[0021] Figure 3 Schematic diagram of the technical route of an online monitoring system for the water content of decafluoropentane provided by an embodiment of the present invention.

[0022] Figure 4 Schematic diagram of the working process of a high-precision intermittent calibration subsystem provided by an embodiment of the present invention.

[0023] Figure 5 Schematic diagram of the composition of a continuous detection subsystem provided by an embodiment of the present invention.

[0024] Figure 6 Schematic diagram of the working process in a continuous detection subsystem.

[0025] Figure 7 Schematic diagram of the structure of an online monitoring system for the water content of an evaporation cooling medium provided by an embodiment of the present invention. Detailed implementation manners

[0026] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] For each specific technical feature in each of the embodiments described in the detailed implementation manners, various combinations can be made without conflict. For example, different embodiments can be formed by combining different specific technical features. To avoid unnecessary repetition, various possible combination manners of each specific technical feature in the present invention will not be described separately.

[0028] Here, it should also be noted that in order to avoid obscuring the present invention due to unnecessary details, only the structures and / or processing steps closely related to the solution of the present invention are shown in the drawings, while other details less related to the present invention are omitted.

[0029] In addition, it should be noted that the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. In the following description, the terms "first / second / ..." involved are only used to distinguish different objects and do not indicate any identity or relationship between the objects. It should be understood that the orientation descriptions such as "above", "below", "inside", "outside", etc. represent the orientations in the normal use state.

[0030] The present invention provides an on-line monitoring method for the water content of an evaporation cooling medium, as Figure 1 shown Figure 1 is a schematic flow chart of an on-line monitoring method for the water content of an evaporation cooling medium provided by an embodiment of the present invention, which is applied to an on-line monitoring system for the water content of an evaporation cooling medium; the monitoring system at least includes a low-precision continuous detection subsystem containing a sensor based on the dielectric constant method and a high-precision intermittent calibration subsystem containing a Karl Fischer test device; the monitoring method includes: Step S101, monitor the water content of the evaporation cooling medium through the low-precision continuous detection subsystem, and obtain first data corresponding to the water content of the evaporation cooling medium through the sensor.

[0031] Step S102, when the first data indicates an abnormal fluctuation in the water content of the evaporation cooling medium, start the high-precision intermittent calibration subsystem, and accurately measure the water content of the evaporation cooling medium through the Karl Fischer test device to achieve automatic response and precise calibration.

[0032] It should be noted that the monitoring system at least includes a low-precision continuous detection subsystem containing a sensor based on the dielectric constant method and a high-precision intermittent calibration subsystem containing a Karl Fischer test device; among them, the low-precision continuous detection subsystem, the high-precision intermittent calibration subsystem, the sensor, and the Karl Fischer test device can all be determined according to the actual situation and are not limited here. As an example, the sensor can include a capacitance sensor; the Karl Fischer test device can also be referred to as the design of a Karl Fischer test system. In practical applications, the monitoring system can also include an online moisture content monitoring platform; the online moisture content monitoring platform is respectively connected to the low-precision continuous detection subsystem and the high-precision intermittent calibration subsystem. As an example, the online moisture content monitoring platform can include online visualization of moisture content, system operation status, moisture content, operation status monitoring, data monitoring, abnormal data alarm, user interaction, background management, and platform interface. As an example, the low-precision continuous detection subsystem can include continuous detection based on the dielectric constant method, a capacitance sensor, a control circuit, a signal processing circuit, a communication circuit, a real-time monitoring system, 24-hour real-time monitoring, and abnormal data alarm. The high-precision intermittent calibration subsystem can include the design of a Karl Fischer test system, a reagent supply module, a reaction cell, a data acquisition module, a control module, an electrode system, a communication interface, a temperature and pressure compensation system, a temperature sensor, and a pressure sensor. In practical applications, the low-precision continuous monitoring subsystem can also include a power supply module, a signal processing circuit, and a communication circuit. Among them, the design of the power supply module is mainly divided into two parts. Among them, the front end of this module mainly relies on a switching power supply system constructed by a chip, which has the function of stably converting the externally provided DC voltage into the DC voltage required by the system. A relay is added to the latter half of the circuit, mainly used to achieve electrical isolation and prevent the switching power supply frequency from interfering with the frequency of the acquired signal; since the single-chip microcomputer cannot directly process analog signals, a hardware circuit needs to be designed to convert the measured capacitance into an electrical signal that the single-chip microcomputer can process. Generally, the RC oscillation method is used to design the conversion circuit. The conversion circuit designed with the chip as the core can convert the measured capacitance value into a frequency and then process it. This circuit can convert the capacitance value measured by the plate capacitance sensor into a stable square wave output, and then be transmitted to the single-chip microcomputer after filtering, amplification, and other processing by the subsequent signal circuit; for the communication circuit, in terms of data transmission, the system selects RS485 as the communication interface. This is because RS485 performs excellently in long-distance transmission and multi-point communication systems, can support a long distance of 1200 meters, and has strong anti-interference ability. The RS485 communication interface uses a differential signal transmission method and has strong anti-electromagnetic interference ability.

[0033] In step S101, the specific monitoring process of monitoring the moisture content of the evaporative cooling medium by the low-precision continuous detection subsystem can be determined according to the actual situation and will not be limited herein. As an example, the low-precision continuous detection subsystem can be responsible for continuously monitoring the moisture content of the evaporative cooling medium for 24 hours without interruption.

[0034] The specific acquisition process of obtaining the first data corresponding to the moisture content of the evaporative cooling medium through the sensor can be determined according to the actual situation and will not be limited herein. As an example, the first data can be moisture content data; the process of obtaining the first data corresponding to the moisture content of the evaporative cooling medium through the sensor can be to obtain moisture content data in real time through sensing technologies such as the dielectric constant method.

[0035] In step S102, the abnormal fluctuation in which the first data characterizes that the moisture content of the evaporative cooling medium has an abnormal fluctuation can be determined according to the actual situation and will not be limited herein. As an example, the first data characterizing that the moisture content of the evaporative cooling medium has an abnormal fluctuation can include determining that the first data characterizes that the moisture content of the evaporative cooling medium has an abnormal fluctuation when the moisture content of the evaporative cooling medium exceeds a preset range.

[0036] Starting the high-precision intermittent calibration subsystem can also be understood as triggering the high-precision intermittent calibration subsystem.

[0037] The specific determination process of accurately measuring the moisture content of the evaporative cooling medium by the Karl Fischer test device can be determined according to the actual situation and will not be limited herein. As an example, the Karl Fischer test device includes a Karl Fischer reagent supply module, a reaction cell, and an electrode module; the process of accurately measuring the moisture content of the evaporative cooling medium by the Karl Fischer test device can be to transport the Karl Fischer reagent to the reaction cell through the Karl Fischer reagent supply module for reaction, and monitor the current of the electrode module; the current is proportional to the moisture content of the evaporative cooling medium; and the moisture content of the evaporative cooling medium is accurately measured based on the current.

[0038] In practical applications, the low-precision continuous detection subsystem is responsible for continuously monitoring the moisture content of the evaporative cooling medium for 24 hours without interruption, and obtaining moisture content data in real time through sensing technologies such as the dielectric constant method.

[0039] The high-precision intermittent calibration subsystem will automatically start when detecting abnormal data fluctuations, and accurately measure the moisture content by the high-precision Karl Fischer method. This subsystem has an automatic response mechanism, which can timely detect moisture abnormalities and perform high-precision calibration.

[0040] The on-line moisture content monitoring platform is the core of this system, responsible for real-time data acquisition, processing and monitoring, and providing an intuitive operation interface for users. The monitoring platform is connected to the low-precision continuous detection subsystem, monitors the moisture content of the liquid medium continuously for 24 hours, and obtains data in real time through the capacitance sensor using the dielectric constant method. When abnormal fluctuations in the moisture content are detected, the monitoring platform will automatically trigger the high-precision intermittent calibration subsystem, enable the Karl Fischer method for accurate determination, and achieve automatic response and accurate calibration. This monitoring platform also has functions such as data analysis and alarm, ensuring the stability and efficiency of the system, and facilitating remote management and monitoring.

[0041] An embodiment of the present invention provides a monitoring method, which obtains first data corresponding to the moisture content of the evaporation cooling medium through a sensor; in the case where the first data indicates abnormal fluctuations in the moisture content of the evaporation cooling medium, the high-precision intermittent calibration subsystem is started, and the moisture content of the evaporation cooling medium is accurately determined through the Karl Fischer test device, achieving automatic response and accurate calibration. That is, by adopting the measurement principle of the Karl Fischer coulometry and combining with the high-precision intermittent calibration technology, rapid and high-precision on-line monitoring of trace water in the evaporation cooling medium can be realized, with high measurement accuracy and good repeatability, providing accurate data support for the evaluation of the insulation performance of the cooling medium.

[0042] In some embodiments, the sensor includes a capacitance sensor; the first data includes the moisture concentration; the obtaining of the first data corresponding to the moisture content of the evaporation cooling medium through the sensor includes: Determining a first capacitance value by the capacitance sensor based on the change in the moisture content of the evaporation cooling medium; Performing a conversion process on the first capacitance value to obtain a frequency signal corresponding to the first capacitance value; Determining the moisture concentration based on the frequency signal.

[0043] In this embodiment, the specific determination process in determining the first capacitance value by the capacitance sensor based on the change in the moisture content of the evaporation cooling medium can be determined according to the actual situation and is not limited herein. As an example, based on the dielectric constant method, the moisture content in perfluoropentane is continuously monitored through a capacitance sensor. The change in the moisture content will cause a change in the dielectric constant of the medium, thereby affecting the capacitance value.

[0044] The conversion process in performing a conversion process on the first capacitance value to obtain a frequency signal corresponding to the first capacitance value can be determined according to the actual situation and is not limited herein. As an example, the sensor converts the capacitance value into a frequency signal.

[0045] The specific determination process for determining the moisture concentration based on the frequency signal can be determined according to the actual situation and is not limited herein. As an example, the real-time moisture concentration is calculated based on the frequency signal through an algorithm.

[0046] In practical applications, based on the dielectric constant method, the moisture content in perfluoropentane is continuously monitored by a capacitance sensor. The change in moisture content will cause a change in the dielectric constant of the medium, thereby affecting the capacitance value. The sensor converts the capacitance value into a frequency signal, and the microcontroller calculates the real-time moisture concentration through an algorithm.

[0047] In some embodiments, the first data characterizes that the moisture content of the evaporative cooling medium fluctuates abnormally, including: When the moisture content of the evaporative cooling medium exceeds the preset range, it is determined that the first data characterizes that the moisture content of the evaporative cooling medium fluctuates abnormally.

[0048] In this embodiment, the preset range can be determined according to the actual situation and is not limited herein.

[0049] In practical applications, as an example, when the system detects that the moisture content fluctuates beyond the set range, the Karl Fischer calibration device is started for accurate measurement. The Karl Fischer method accurately determines the moisture content through the principle of electrochemical reaction, and calibrates the real-time monitoring data according to the calibration result to ensure the accuracy of the final data.

[0050] The system works automatically for 24 hours, which can not only monitor the moisture content in real time, but also trigger the Karl Fischer high-precision calibration system when abnormal fluctuations occur to ensure continuous and accurate monitoring of the water content.

[0051] In some embodiments, the Karl Fischer test device includes a Karl Fischer reagent supply module, a reaction cell, and an electrode module; the accurate determination of the moisture content of the evaporative cooling medium by the Karl Fischer test device includes: The Karl Fischer reagent is transported to the reaction cell by the Karl Fischer reagent supply module for reaction, and the current of the electrode module is monitored; the current is proportional to the moisture content of the evaporative cooling medium; Based on the current, the moisture content of the evaporative cooling medium is accurately determined.

[0052] In this embodiment, the fact that the current is proportional to the moisture content of the evaporative cooling medium can be understood as that the larger the current, the larger the moisture content of the evaporative cooling medium; the smaller the current, the smaller the moisture content of the evaporative cooling medium.

[0053] The Karl Fischer reagent is transported to the reaction cell through the Karl Fischer reagent supply module for reaction. Monitoring the current of the electrode module can be understood as the Karl Fischer reagent supply module is responsible for accurately transporting the Karl Fischer reagent into the reaction cell to ensure the smooth progress of the reaction, and then monitoring the current in real time.

[0054] Accurately determining the moisture content of the evaporative cooling medium based on the current can be understood as accurately detecting the concentration of moisture by real-time monitoring of the current.

[0055] In practical applications, the Karl Fischer reagent supply module is responsible for accurately transporting the Karl Fischer reagent into the reaction cell to ensure the smooth progress of the reaction; the reaction cell and the stirring system are responsible for accommodating the perfluoropentane sample and the Karl Fischer reagent and carrying out the reaction; the electrode system uses a metal electrode as an indicator for the electrochemical reaction, and the magnitude of the current is proportional to the moisture content. Therefore, by real-time monitoring of the current, the system can accurately detect the concentration of moisture.

[0056] In some embodiments, the Karl Fischer test device further includes a temperature and pressure compensation module, and the method includes: Real-time monitoring of the change parameters of the temperature and pressure of the reaction cell through the temperature and pressure compensation module; Correcting the result of accurately determining the moisture content of the evaporative cooling medium based on the change parameters and a preset compensation algorithm.

[0057] In this embodiment, the Karl Fischer test device further includes a temperature and pressure compensation module; the temperature and pressure compensation module can be determined according to the actual situation and is not limited here. As an example, the temperature and pressure compensation module can also be referred to as a temperature and pressure compensation system.

[0058] Real-time monitoring of the change parameters of the temperature and pressure of the reaction cell through the temperature and pressure compensation module can be understood as the temperature and pressure compensation system is used to monitor the temperature and pressure changes of the reaction cell in real time.

[0059] Correcting the result of accurately determining the moisture content of the evaporative cooling medium based on the change parameters and a preset compensation algorithm can be understood as correcting the measurement result through a temperature compensation algorithm.

[0060] In practical applications, the control and data acquisition module is the "brain" of the entire online testing system, responsible for coordinating the work of each module. This module uses a microcontroller to achieve real-time monitoring and control of reagent delivery, reaction cell temperature, pressure, and electrode signals. The temperature and pressure compensation system is used to monitor the temperature and pressure changes of the reaction cell in real time and correct the measurement results through a temperature compensation algorithm; the output and communication interface uses RS485 to achieve stable data transmission with the host computer.

[0061] In practical applications, aiming at problems such as excessive water content affecting the insulation performance of the cooling medium, the present invention has developed and designed an online monitoring device and method for the water content of the evaporative cooling medium; the present invention intends to combine the online detection technology of the water content of the liquid medium with the principle of high-precision micro-water component calibration measurement of the solution to develop a reliable and easy-to-install and arrange online monitoring device for the water content of decafluoropentane. The core architecture of the system is divided into three major parts: a low-precision continuous detection subsystem, a high-precision intermittent calibration subsystem, and an online water content monitoring platform. The system architecture is as Figure 2 shown. Figure 2 It is a schematic diagram of the online monitoring system architecture for the water content of decafluoropentane provided by the embodiment of the present invention.

[0062] The low-precision continuous detection subsystem is responsible for continuously monitoring the water content of the evaporative cooling medium for 24 hours and obtaining water content data in real time through sensing technologies such as the dielectric constant method.

[0063] The high-precision intermittent calibration subsystem will be automatically activated when abnormal data fluctuations are detected, and the water content will be accurately measured by the high-precision Karl Fischer method. This subsystem has an automatic response mechanism, which can detect water anomalies in a timely manner and perform high-precision calibration.

[0064] The online water content monitoring platform is the core of this system, responsible for real-time data collection, processing and monitoring, and providing an intuitive operation interface for users. The monitoring platform is connected to the low-precision continuous detection subsystem, continuously monitors the water content of the liquid medium for 24 hours, and obtains data in real time through a dielectric constant method capacitance sensor. When abnormal fluctuations in the water content are detected, this monitoring platform will automatically trigger the high-precision intermittent calibration subsystem, enable the Karl Fischer method for accurate measurement, and achieve automatic response and accurate calibration. This monitoring platform also has functions such as data analysis and alarm to ensure the stability and efficiency of the system and facilitate remote management and monitoring.

[0065] The technical route of this project intends to adopt a dual monitoring mechanism, combining real-time monitoring and high-precision calibration to ensure that while meeting the online monitoring requirements, accurate water content data can be provided in case of anomalies. As Figure 3 shown. Figure 3 It is a schematic diagram of the technical route of the online monitoring system for the water content of decafluoropentane provided by the embodiment of the present invention.

[0066] Real-time monitoring technology: Based on the dielectric constant method, the moisture content in decafluoropentane is continuously monitored through a capacitance sensor. Changes in the moisture content will cause changes in the dielectric constant of the medium, thereby affecting the capacitance value. The sensor converts the capacitance value into a frequency signal, and the microcontroller calculates the real-time moisture concentration through an algorithm.

[0067] Karl Fischer high-precision calibration technology: When the system detects that the moisture content fluctuation exceeds the set range, the Karl Fischer calibration device is started for precise measurement. The Karl Fischer method accurately determines the moisture content through the principle of electrochemical reaction, and calibrates the real-time monitoring data according to the calibration results to ensure the accuracy of the final data.

[0068] Automated monitoring and regulation: The system works automatically for 24 hours. It can not only monitor the moisture content in real time, but also trigger the Karl Fischer high-precision calibration system when abnormal fluctuations occur to ensure continuous and accurate monitoring of the water content.

[0069] High-precision intermittent calibration subsystem: To ensure the long-term stability and measurement accuracy of the monitoring device, the high-precision intermittent calibration subsystem adopts the Karl Fischer high-precision calibration technology. The online Karl Fischer test system is designed to meet the precise measurement requirements of trace moisture. The key components of this system include the following parts: The Karl Fischer reagent supply module is responsible for accurately delivering the Karl Fischer reagent to the reaction cell to ensure the smooth progress of the reaction; the reaction cell and the stirring system are responsible for accommodating the decafluoropentane sample and the Karl Fischer reagent and carrying out the reaction; the electrode system uses metal electrodes as indicators of the electrochemical reaction. The magnitude of the current is proportional to the moisture content. Therefore, by continuously monitoring the current in real time, the system can accurately detect the moisture concentration; The control and data acquisition module is the "brain" of the entire online test system, responsible for coordinating the work of each module. This module realizes the real-time monitoring and control of reagent delivery, reaction cell temperature, pressure, and electrode signals through a microcontroller. The temperature and pressure compensation system is used to continuously monitor the temperature and pressure changes in the reaction cell, and correct the measurement results through a temperature compensation algorithm; the output and communication interface adopts RS485 to achieve stable data transmission with the upper computer.

[0070] Workflow: The workflow of the online Karl Fischer test system is divided into multiple links, and each link is completed under the precise control of the system to ensure the accuracy and stability of moisture measurement. The system workflow is as Figure 4 shown. Figure 4This is a schematic diagram of the working process of the high-precision intermittent calibration subsystem in the embodiment of the present invention. When the system starts, it executes a self-check program to check the hardware status such as the reagent module, electrode contact, and reaction cell temperature and pressure. After the self-check passes, the sensors and actuators are initialized, and parameters such as reagent flow rate, temperature, and pressure are set and imported into the control system, and then it enters the standby state to prepare for detection. After the decafluoropentane sample to be measured enters the reaction cell, it is mixed with the Karl Fischer reagent with an automatically adjusted amount, and the moisture detection reaction begins.

[0071] The electrode real-time monitors the current change in the electrolysis reaction. The magnitude of the current is proportional to the moisture concentration. The control system collects the electrode signal and calculates the moisture concentration by combining the temperature, pressure compensation, and calibration data. After the electrode signal is converted into a digital signal by the data acquisition module, it is transmitted to the control system, and the moisture content is calculated and corrected using the real-time current, temperature, pressure data, and calibration coefficient. After the reaction reaches the end point, the system stops the reagent supply, the electrode signal stabilizes, the moisture measurement ends, and the result is output to the upper computer through the display or communication interface. The real-time data can be viewed and automatically recorded for subsequent analysis.

[0072] Low-precision continuous monitoring subsystem: The components of the continuous detection subsystem are as Figure 5 shown, Figure 5 This is a schematic diagram of the composition of the continuous detection subsystem in the embodiment of the present invention. The specific composition design is as follows: (1) Power supply module.

[0073] The design of the power supply module is mainly divided into two parts. Among them, the front end of this module mainly relies on the switching power supply system constructed by the chip, which has the function of stably converting the externally provided DC voltage into the DC voltage required by the system. A relay is added to the latter half of the circuit, mainly used to achieve electrical isolation and prevent the switching power supply frequency from interfering with the frequency of the collected signal.

[0074] (2) Signal processing circuit.

[0075] Since the single-chip microcomputer cannot directly process analog signals, it is necessary to design a hardware circuit to convert the measured capacitance into an electrical signal that the single-chip microcomputer can process. Generally, the RC oscillation method is used to design the conversion circuit. The conversion circuit designed with the chip as the core can convert the measured capacitance value into a frequency and then process it. This circuit can convert the capacitance value measured by the plate capacitance sensor into a stable square wave output, and then transmit it to the single-chip microcomputer after filtering, amplifying and other processing through the subsequent signal circuit.

[0076] (3) Communication circuit.

[0077] In terms of data transmission, the system selects RS485 as the communication interface. This is because RS485 performs excellently in long-distance transmission and multi-point communication systems, capable of supporting a distance of 1200 meters and having strong anti-interference ability. The RS485 communication interface adopts differential signal transmission mode, with strong anti-electromagnetic interference ability.

[0078] Workflow: In the continuous detection subsystem, the workflow diagram is as Figure 6 shown, Figure 6 which is a schematic diagram of the workflow in the continuous detection subsystem.

[0079] When the system starts, the power module provides a stable DC voltage, the relay is turned on and directly powered by the switching power supply. After completing the hardware self-check, system parameter loading, and sensor initialization, it enters the standby state. The system continuously collects the change in the dielectric constant of decafluoropentane through the capacitive sensor, converts the capacitance value into a frequency signal, and ensures signal stability and accuracy through a low-pass filter and an inverter. To distinguish dissolved water and free water, the system uses different calibration algorithms, with a linear relationship for dissolved water and a non-linear model for free water.

[0080] The signal processing and calculation part precisely processes the frequency signal through the single-chip microcomputer. For dissolved water, a linear conversion formula is used, and for free water, a non-linear fitting algorithm is adopted. Combining temperature compensation and denoising processing improves the measurement accuracy. The calculated moisture concentration data is transmitted to the upper computer through the RS485 interface for further analysis and display. The system monitors the data quality of the capacitive sensor and the signal processing module in real time, immediately alarms when an anomaly is detected, and monitors the communication module to ensure the stability of data transmission. The system also has a periodic calibration and self-check function, regularly checking the working status of the sensor and the signal processing circuit to ensure its operation within the standard range, and automatically triggering the calibration process when a deviation is found, updating relevant parameters to ensure accuracy during long-term use.

[0081] The on-line monitoring system and method for the water content of the evaporation cooling medium provided by the present invention have the following advantages: 1. High-precision monitoring: Adopting the measurement principle of Karl Fischer coulometry and combining with high-precision intermittent calibration technology, it can realize fast and high-precision on-line monitoring of the micro water in the evaporation cooling medium, with high measurement accuracy and good repeatability, providing accurate data support for the evaluation of the insulation performance of the cooling medium.

[0082] 2. High reliability: The system consists of multiple modules, and the modules cooperate with each other and work together to ensure the high reliability of the monitoring device.

[0083] 3. Real-time alarm function: It has a real-time alarm function. When the monitored water content exceeds the set alarm threshold, it can immediately send out an alarm signal.

[0084] 4. Data Transmission and Centralized Monitoring: Universal communication protocols such as RS485 are adopted to output monitoring data and alarm information, facilitating seamless connection with existing power monitoring systems and realizing remote data transmission and centralized monitoring.

[0085] An embodiment of the present invention also provides an on-line monitoring system 700 for the water content of an evaporation cooling medium, as Figure 7 shown. Figure 7 It is a schematic structural diagram of an on-line monitoring system for the water content of an evaporation cooling medium provided by an embodiment of the present invention; the structure and functions of the monitoring system will be exemplarily described below in conjunction with each embodiment.

[0086] The monitoring system 700 includes a low-precision continuous detection subsystem 701 containing a sensor based on the dielectric constant method, a high-precision intermittent calibration subsystem 703 containing a Karl Fischer test device, and an on-line water content detection platform 702; the on-line water content detection platform 702 is respectively connected to the low-precision continuous detection subsystem 701 and the high-precision intermittent calibration subsystem 703; wherein, The low-precision continuous detection subsystem 701 is used to monitor the water content of the evaporation cooling medium and obtain first data corresponding to the water content of the evaporation cooling medium through the sensor. The on-line water content detection platform 702 is used to start the high-precision intermittent calibration subsystem when the first data indicates abnormal fluctuations in the water content of the evaporation cooling medium. The high-precision intermittent calibration subsystem 703 is used to accurately measure the water content of the evaporation cooling medium through the Karl Fischer test device to achieve automatic response and precise calibration.

[0087] It should be noted that the monitoring system at least includes a low-precision continuous detection subsystem containing a sensor based on the dielectric constant method and a high-precision intermittent calibration subsystem containing a Karl Fischer test device; among them, the low-precision continuous detection subsystem, the high-precision intermittent calibration subsystem, the sensor, and the Karl Fischer test device can all be determined according to actual situations and are not limited here. As an example, the sensor can include a capacitance sensor; the Karl Fischer test device can also be referred to as the design of the Karl Fischer test system. In practical applications, the monitoring system can also include an online moisture content monitoring platform; the online moisture content monitoring platform is respectively connected to the low-precision continuous detection subsystem and the high-precision intermittent calibration subsystem. As an example, the online moisture content monitoring platform can include online visualization of moisture content, system operation status, moisture content, operation status monitoring, data monitoring, abnormal data alarm, user interaction, background management, and platform interface. As an example, the low-precision continuous detection subsystem can include continuous detection based on the dielectric constant method, a capacitance sensor, a control circuit, a signal processing circuit, a communication circuit, a real-time monitoring system, 24-hour real-time monitoring, and abnormal data alarm. The high-precision intermittent calibration subsystem can include the design of the Karl Fischer test system, a reagent supply module, a reaction cell, a data acquisition module, a control module, an electrode system, a communication interface, a temperature and pressure compensation system, a temperature sensor, and a pressure sensor. In practical applications, the low-precision continuous monitoring subsystem can also include a power supply module, a signal processing circuit, and a communication circuit. Among them, the design of the power supply module is mainly divided into two parts. Among them, the front end of this module mainly relies on a switching power supply system constructed by a chip, which has the function of stably converting the externally provided DC voltage into the DC voltage required by the system. A relay is added to the latter half of the circuit, mainly used to achieve electrical isolation and prevent the switching power supply frequency from interfering with the frequency of the collected signal; since the single-chip microcomputer cannot directly process analog signals, a hardware circuit needs to be designed to convert the measured capacitance into an electrical signal that the single-chip microcomputer can process. Generally, the RC oscillation method is used to design the conversion circuit. The conversion circuit designed with the chip as the core can convert the measured capacitance value into a frequency and then process it. This circuit can convert the capacitance value measured by the plate capacitance sensor into a stable square wave output, and then be filtered, amplified, etc. by the subsequent signal circuit and transmitted to the single-chip microcomputer; for the communication circuit, in terms of data transmission, the system selects RS485 as the communication interface. This is because RS485 performs well in long-distance transmission and multi-point communication systems, and can support a relatively long distance and strong anti-interference ability. The RS485 communication interface uses a differential signal transmission method and has strong anti-electromagnetic interference ability.

[0088] In some embodiments, the sensor includes a capacitance sensor; the first data includes the moisture concentration; The low-precision continuous detection subsystem 701 is further configured to determine a first capacitance value based on the change in the moisture content of the evaporative cooling medium through the capacitance sensor; perform a conversion process on the first capacitance value to obtain a frequency signal corresponding to the first capacitance value; and determine the moisture concentration based on the frequency signal.

[0089] In this embodiment, the specific determination process in determining the first capacitance value based on the change in the moisture content of the evaporative cooling medium through the capacitance sensor can be determined according to the actual situation and is not limited herein. As an example, based on the dielectric constant method, the moisture content in decafluoropentane is continuously monitored through a capacitance sensor. The change in the moisture content will cause a change in the dielectric constant of the medium, thereby affecting the capacitance value.

[0090] The conversion process in performing a conversion process on the first capacitance value to obtain a frequency signal corresponding to the first capacitance value can be determined according to the actual situation and is not limited herein. As an example, the sensor converts the capacitance value into a frequency signal.

[0091] The specific determination process in determining the moisture concentration based on the frequency signal can be determined according to the actual situation and is not limited herein. As an example, the real-time moisture concentration is calculated through an algorithm based on the frequency signal.

[0092] In practical applications, based on the dielectric constant method, the moisture content in decafluoropentane is continuously monitored through a capacitance sensor. The change in the moisture content will cause a change in the dielectric constant of the medium, thereby affecting the capacitance value. The sensor converts the capacitance value into a frequency signal, and the microcontroller calculates the real-time moisture concentration through an algorithm.

[0093] In some embodiments, the online moisture content detection platform 702 is further configured to determine that the first data indicates an abnormal fluctuation in the moisture content of the evaporative cooling medium when the moisture content of the evaporative cooling medium exceeds a preset range.

[0094] In this embodiment, the preset range can be determined according to the actual situation and is not limited herein.

[0095] In practical applications, as an example, when the system detects that the moisture content fluctuation exceeds the set range, the Karl Fischer calibration device is started for accurate measurement. The Karl Fischer method accurately determines the moisture content through the principle of electrochemical reaction and calibrates the real-time monitoring data according to the calibration result to ensure the accuracy of the final data.

[0096] The system operates automatically for 24 hours, which can not only monitor the moisture content in real time, but also trigger the Karl Fischer high-precision calibration system when an abnormal fluctuation occurs to ensure continuous and accurate monitoring of the water content.

[0097] In some embodiments, the Karl Fischer test device includes a Karl Fischer reagent supply module, a reaction cell, and an electrode module; The high-precision intermittent calibration subsystem 703 is further configured to deliver the Karl Fischer reagent to the reaction cell through the Karl Fischer reagent supply module for reaction, and monitor the current of the electrode module; the current is proportional to the moisture content of the evaporative cooling medium; and based on the current, accurately determine the moisture content of the evaporative cooling medium.

[0098] In this embodiment, the fact that the current is proportional to the moisture content of the evaporative cooling medium can be understood as that the greater the current, the greater the moisture content of the evaporative cooling medium; and the smaller the current, the smaller the moisture content of the evaporative cooling medium.

[0099] The delivering the Karl Fischer reagent to the reaction cell through the Karl Fischer reagent supply module for reaction and monitoring the current of the electrode module can be understood as that the Karl Fischer reagent supply module is responsible for accurately delivering the Karl Fischer reagent into the reaction cell to ensure the smooth progress of the reaction, and then monitoring the current in real time.

[0100] Accurately determining the moisture content of the evaporative cooling medium based on the current can be understood as that by real-time monitoring of the current, accurately detecting the concentration of moisture.

[0101] In practical applications, the Karl Fischer reagent supply module is responsible for accurately delivering the Karl Fischer reagent into the reaction cell to ensure the smooth progress of the reaction; the reaction cell and the stirring system are responsible for accommodating the perfluoropentane sample and the Karl Fischer reagent and carrying out the reaction; the electrode system uses a metal electrode as an indicator for the electrochemical reaction, and the magnitude of the current is proportional to the moisture content. Therefore, by real-time monitoring of the current, the system can accurately detect the concentration of moisture.

[0102] In some embodiments, the Karl Fischer test device further includes a temperature and pressure compensation module; The temperature and pressure compensation module is configured to monitor the change parameters of the temperature and pressure of the reaction cell in real time; and correct the result of accurately determining the moisture content of the evaporative cooling medium based on the change parameters and a preset compensation algorithm.

[0103] In this embodiment, the Karl Fischer test device further includes a temperature and pressure compensation module; the temperature and pressure compensation module can be determined according to actual situations and is not limited herein. As an example, the temperature and pressure compensation module can also be referred to as a temperature and pressure compensation system.

[0104] The change parameters of the temperature and pressure of the reaction tank monitored in real time by the temperature and pressure compensation module can be understood as that the temperature and pressure compensation system is used to monitor the temperature and pressure changes of the reaction tank in real time.

[0105] The result of accurately measuring the water content of the evaporative cooling medium based on the change parameters and a preset compensation algorithm is corrected, which can be understood as correcting the measurement result through a temperature compensation algorithm.

[0106] In practical applications, the control and data acquisition module is the "brain" of the entire online testing system, responsible for coordinating the work of each module. This module realizes the real-time monitoring and control of reagent delivery, reaction tank temperature, pressure, and electrode signals through a microcontroller. The temperature and pressure compensation system is used to monitor the temperature and pressure changes of the reaction tank in real time and correct the measurement results through a temperature compensation algorithm; the output and communication interface adopts RS485 to achieve stable data transmission with the upper computer.

[0107] In practical applications, the present invention intends to combine the online detection technology of the water content of liquid media with the principle of high-precision micro water component calibration measurement of solutions to develop an online monitoring system for the water content of decafluoropentane with high reliability and easy installation and layout. The core architecture of the system is divided into three major parts: a low-precision continuous detection subsystem, a high-precision intermittent calibration subsystem, and an online monitoring platform for water content. The low-precision continuous detection subsystem is responsible for continuously monitoring the water content of the evaporative cooling medium for 24 hours and obtaining water content data in real time through sensing technologies such as the dielectric constant method.

[0108] The high-precision intermittent calibration subsystem will be automatically started when abnormal data fluctuations are detected, and the water content will be accurately measured by the high-precision Karl Fischer method. This subsystem has an automatic response mechanism and can timely detect abnormal water content and perform high-precision calibration.

[0109] The online monitoring platform for water content is the core of this system, responsible for real-time data acquisition, processing, and monitoring, and providing an intuitive operation interface for users. The monitoring platform is connected to the low-precision continuous detection subsystem, continuously monitors the water content of the liquid medium for 24 hours, and obtains data in real time through a dielectric constant method capacitance sensor. When abnormal fluctuations in the water content are detected, this monitoring platform will automatically trigger the high-precision intermittent calibration subsystem, enable the Karl Fischer method for accurate measurement, and achieve automatic response and precise calibration. This monitoring platform also has functions such as data analysis and alarm to ensure the stability and efficiency of the system and facilitate remote management and monitoring. In order to ensure the long-term stability and measurement accuracy of the monitoring device, the high-precision intermittent calibration subsystem adopts Karl Fischer high-precision calibration technology. The online Karl Fischer test system is designed to meet the precise measurement requirements of trace water. The key components of this system include the following parts: The Karl Fischer reagent supply module is responsible for accurately delivering the Karl Fischer reagent to the reaction cell to ensure the smooth progress of the reaction; the reaction cell and the stirring system are responsible for accommodating the perfluoropentane sample and the Karl Fischer reagent and carrying out the reaction; the electrode system uses metal electrodes as indicators for electrochemical reactions. The magnitude of the current is proportional to the water content. Therefore, by monitoring the current in real time, the system can accurately detect the water concentration; The control and data acquisition module is the "brain" of the entire on-line testing system, responsible for coordinating the work of each module. This module uses a microcontroller to achieve real-time monitoring and control of reagent delivery, reaction cell temperature, pressure, and electrode signals. The temperature and pressure compensation system is used to monitor the temperature and pressure changes of the reaction cell in real time and correct the measurement results through temperature compensation algorithms; the output and communication interface uses RS485 to achieve stable data transmission with the host computer.

[0110] The low-precision continuous monitoring subsystem may also include a power supply module, a signal processing circuit, and a communication circuit. Among them, the design of the power supply module is mainly divided into two parts. Among them, the front end of this module mainly relies on the switching power supply system built by the chip, which has the function of stably converting the externally provided DC voltage into the DC voltage required by the system. A relay is added to the latter half of the circuit, mainly used to achieve electrical isolation and prevent the switching power supply frequency from interfering with the frequency of the collected signal; since the single-chip microcomputer cannot directly process analog signals, the signal processing circuit needs to design a hardware circuit to convert the measured capacitance into an electrical signal that the single-chip microcomputer can process. Generally, the RC oscillation method is used to design the conversion circuit. The conversion circuit designed with the chip as the core can convert the measured capacitance value into a frequency and then process it. This circuit can convert the capacitance value measured by the plate capacitance sensor into a stable square wave output, and then transmit it to the single-chip microcomputer after filtering, amplifying and other processing through the subsequent signal circuit; for the communication circuit, in terms of data transmission, the system selects RS485 as the communication interface. This is because RS485 performs well in long-distance transmission and multi-point communication systems, and can support longer distances and stronger anti-interference capabilities. The RS485 communication interface uses a differential signal transmission method and has strong anti-electromagnetic interference capabilities.

[0111] When the system starts up, the power supply module provides a stable DC voltage, the relay is turned on and directly powered by the switching power supply. After completing the hardware self-check, system parameter loading, and sensor initialization, it enters the standby state. The system continuously collects the change in the dielectric constant of perfluoropentane through the capacitance sensor, converts the capacitance value into a frequency signal, and ensures the signal stability and accuracy through a low-pass filter and an inverter. To distinguish between dissolved water and free water, the system uses different calibration algorithms, with a linear relationship for dissolved water and a non-linear model for free water.

[0112] The signal processing and calculation part accurately processes the frequency signal through a single-chip microcomputer. The dissolved water adopts a linear conversion formula, and the free water adopts a non-linear fitting algorithm. Combined with temperature compensation and denoising processing, the measurement accuracy is improved. The calculated moisture concentration data is transmitted to the upper computer through the RS485 interface for further analysis and display. The system monitors the data quality of the capacitive sensor and the signal processing module in real time, immediately alarms when an abnormality is detected, and monitors the communication module to ensure the stability of data transmission. The system also has a periodic calibration and self-check function, regularly checks the working status of the sensor and the signal processing circuit, ensures that it operates within the standard range, and automatically triggers the calibration process when a deviation is found, and updates the relevant parameters to ensure the accuracy during long-term use.

[0113] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. An online monitoring method for the water content of an evaporative cooling medium, characterized in that The described monitoring method is applied to an on-line monitoring system for the water content of an evaporative cooling medium; the monitoring system at least includes a low-precision continuous detection subsystem containing a sensor based on the dielectric constant method and a high-precision intermittent calibration subsystem containing a Karl Fischer test device; the monitoring method includes: Monitoring the water content of the evaporative cooling medium through the low-precision continuous detection subsystem, and obtaining first data corresponding to the water content of the evaporative cooling medium through the sensor; When the first data indicates that the water content of the evaporative cooling medium shows abnormal fluctuations, starting the high-precision intermittent calibration subsystem, and accurately measuring the water content of the evaporative cooling medium through the Karl Fischer test device.

2. The online monitoring method for the water content of an evaporation cooling medium according to claim 1, wherein The sensor includes a capacitance sensor; the first data includes a water concentration; the obtaining of the first data corresponding to the water content of the evaporative cooling medium through the sensor includes: Determining a first capacitance value through the capacitance sensor based on the change in the water content of the evaporative cooling medium; Performing a conversion process on the first capacitance value to obtain a frequency signal corresponding to the first capacitance value; Determining the water concentration based on the frequency signal.

3. The online monitoring method for the water content of an evaporation cooling medium according to claim 1, wherein, The first data indicating that the water content of the evaporative cooling medium shows abnormal fluctuations includes: When the water content of the evaporative cooling medium exceeds a preset range, it is determined that the first data indicates that the water content of the evaporative cooling medium shows abnormal fluctuations.

4. The online monitoring method based on the water content of the evaporative cooling medium according to claim 1, characterized in that The Karl Fischer test device includes a Karl Fischer reagent supply module, a reaction cell, and an electrode module; the accurately measuring the water content of the evaporative cooling medium through the Karl Fischer test device includes: Transporting the Karl Fischer reagent to the reaction cell through the Karl Fischer reagent supply module for reaction, and monitoring the current of the electrode module; the current is proportional to the water content of the evaporative cooling medium; Accurately measuring the water content of the evaporative cooling medium based on the current.

5. The on-line monitoring method for the water content of an evaporation cooling medium according to claim 4, characterized in that, The Karl Fischer test device further includes a temperature and pressure compensation module, including: Real-time monitoring of the change parameters of the temperature and pressure of the reaction cell through the temperature and pressure compensation module; Correcting the result of accurately measuring the water content of the evaporative cooling medium based on the change parameters and a preset compensation algorithm.

6. An on-line monitoring system for the water content of an evaporation cooling medium, characterized in that, The monitoring system includes a low-precision continuous detection subsystem containing a sensor based on the dielectric constant method, a high-precision intermittent calibration subsystem containing a Karl Fischer test device, and an on-line water content detection platform; the on-line water content detection platform is respectively connected to the low-precision continuous detection subsystem and the high-precision intermittent calibration subsystem; Among them, the low-precision continuous detection subsystem is used to monitor the water content of the evaporative cooling medium, and obtain first data corresponding to the water content of the evaporative cooling medium through the sensor; The on-line water content detection platform is used to start the high-precision intermittent calibration subsystem when the first data indicates that the water content of the evaporative cooling medium shows abnormal fluctuations; The high-precision intermittent calibration subsystem is used to accurately measure the moisture content of the evaporative cooling medium through the Karl Fischer test device.

7. The on-line monitoring system based on the water content of the evaporation cooling medium according to claim 6, characterized in that, The sensor includes a capacitance sensor; the first data includes the moisture concentration; The low-precision continuous detection subsystem is further configured to determine a first capacitance value based on the change in the moisture content of the evaporative cooling medium through the capacitance sensor; perform a conversion process on the first capacitance value to obtain a frequency signal corresponding to the first capacitance value; and determine the moisture concentration based on the frequency signal.

8. The on-line monitoring system for the water content of an evaporation cooling medium according to claim 6, characterized in that, The on-line moisture content detection platform is further configured to determine that the first data indicates an abnormal fluctuation in the moisture content of the evaporative cooling medium when the moisture content of the evaporative cooling medium exceeds a preset range.

9. The on-line monitoring system for water content of an evaporation cooling medium according to claim 6, wherein The Karl Fischer test device includes a Karl Fischer reagent supply module, a reaction cell, and an electrode module; The high-precision intermittent calibration subsystem is further configured to transport the Karl Fischer reagent to the reaction cell through the Karl Fischer reagent supply module for reaction, and monitor the current of the electrode module; the current is proportional to the moisture content of the evaporative cooling medium; and accurately measure the moisture content of the evaporative cooling medium based on the current.

10. The online monitoring system based on the water content of the evaporation cooling medium according to claim 9, characterized in that, The Karl Fischer test device further includes a temperature and pressure compensation module; The temperature and pressure compensation module is configured to monitor the change parameters of the temperature and pressure of the reaction cell in real time; and correct the accurate measurement result of the moisture content of the evaporative cooling medium based on the change parameters and a preset compensation algorithm.

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