An online monitoring method and monitoring system for water content of evaporative cooling medium

Abstract

The present invention provides an online monitoring method and system for the moisture content of an evaporative cooling medium, relating to the technical field of monitoring the moisture content of an evaporative cooling medium, and being applied to an online monitoring system for the moisture content of an evaporative cooling medium; the monitoring system comprises at least a low-precision continuous detection subsystem including a sensor based on a dielectric constant method and a high-precision intermittent calibration subsystem including a Karl Fischer test device; the monitoring method comprises: monitoring the moisture content of the evaporative cooling medium by means of the low-precision continuous detection subsystem, and obtaining first data corresponding to the moisture content of the evaporative cooling medium by means of the sensor; and, when the first data indicates abnormal fluctuations in the moisture content of the evaporative cooling medium, activating the high-precision intermittent calibration subsystem and accurately measuring the moisture content of the evaporative cooling medium by means of the Karl Fischer test device, thereby achieving automated response and precise calibration.

Description

Technical Field

[0001] The present invention relates to the technical field of monitoring the water content of evaporative cooling media, and in particular to an online monitoring method and a monitoring system based on the water content of evaporative cooling media. Background Art

[0002] The evaporative cooling system of an underground turbine generator set at a certain hydropower station faced the following problems during operation: on the one hand, there was a certain risk of leakage of the evaporative cooling medium. The leaked decafluoropentane (whose chemical formula is HFC4310) medium was deposited in the wind tunnel, posing a risk of asphyxiation. On the other hand, during system maintenance, drainage, and operation, moisture in the air would dissolve and "seep" into the HFC4310 medium, causing changes in the insulation properties of the cooling medium and posing 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 system for the water content of an evaporative cooling medium, which is used to solve technical problems such as excessive water content affecting the insulation performance of the cooling medium during online monitoring of the water content of the evaporative cooling medium.

[0004] To achieve the above technical features, the present invention achieves its objectives as follows: In a first aspect, the present invention provides an online monitoring method for the moisture content of an evaporative cooling medium, the monitoring method being applied to an online monitoring system for the moisture content of an evaporative cooling medium; the monitoring system comprising at least a low-precision continuous detection subsystem including a sensor based on a dielectric constant method and a high-precision intermittent calibration subsystem including a Karl Fischer test device; the monitoring method comprises:

[0005] 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;

[0006] When the first data indicates that the moisture content of the evaporative cooling medium has abnormal fluctuations, the high-precision intermittent calibration subsystem is started, and the moisture content of the evaporative cooling medium is accurately measured by the Karl Fischer test device.

[0007] Preferably, the sensor includes a capacitive sensor; the first data includes a moisture concentration; and obtaining the first data corresponding to the moisture content of the evaporative cooling medium through the sensor includes:

[0008] determining a first capacitance value based on a change in moisture content of the evaporative cooling medium by the capacitance sensor;

[0009] performing conversion processing on the first capacitance value to obtain a frequency signal corresponding to the first capacitance value;

[0010] The moisture concentration is determined based on the frequency signal.

[0011] Preferably, the first data indicating abnormal fluctuations in the moisture content of the evaporative cooling medium includes:

[0012] When the moisture content of the evaporative cooling medium exceeds a preset range, it is determined that the first data represents an abnormal fluctuation in the moisture content of the evaporative cooling medium.

[0013] Preferably, the Karl Fischer test device includes a Karl Fischer reagent supply module, a reaction cell, and an electrode module; and the method of accurately measuring the moisture content of the evaporative cooling medium by using the Karl Fischer test device includes:

[0014] The Karl Fischer reagent is delivered 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;

[0015] The moisture content of the evaporative cooling medium is accurately measured based on the current.

[0016] Preferably, the Karl Fischer test device further includes a temperature and pressure compensation module, including:

[0017] Real-time monitoring of the temperature and pressure parameters of the reaction tank by the temperature and pressure compensation module;

[0018] The result of accurately measuring the moisture content of the evaporative cooling medium is corrected based on the change parameter and a preset compensation algorithm.

[0019] Another aspect of the present invention provides an online water content monitoring system for evaporative cooling media, the monitoring system comprising a low-precision continuous detection subsystem including a sensor based on a dielectric constant method, a high-precision intermittent calibration subsystem including a Karl Fischer test device, and an online water content detection platform; the online water content detection platform is connected to the low-precision continuous detection subsystem and the high-precision intermittent calibration subsystem, respectively.

[0020] The low-precision continuous detection subsystem is used to monitor the moisture content of the evaporative cooling medium and obtain first data corresponding to the moisture content of the evaporative cooling medium through the sensor;

[0021] The moisture content online detection platform is configured to activate the high-precision intermittent calibration subsystem when the first data indicates that the moisture content of the evaporative cooling medium fluctuates abnormally;

[0022] The high-precision intermittent calibration subsystem is used to accurately measure the moisture content of the evaporative cooling medium using the Karl Fischer test device.

[0023] Preferably, the sensor comprises a capacitive sensor; the first data comprises a moisture concentration;

[0024] The low-precision continuous detection subsystem is further used to determine a first capacitance value based on a change in the moisture content of the evaporative cooling medium through the capacitance sensor; convert 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.

[0025] Preferably, the moisture content online 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.

[0026] Preferably, the Karl Fischer test device comprises a Karl Fischer reagent supply module, a reaction cell, and an electrode module;

[0027] The high-precision intermittent calibration subsystem is further used to transport the Karl Fischer reagent to the reaction cell through the Karl Fischer reagent supply module for reaction, 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.

[0028] Preferably, the Karl Fischer test device further comprises a temperature and pressure compensation module;

[0029] The temperature and pressure compensation module is used to monitor the change parameters of the temperature and pressure of the reaction tank in real time; and to correct the result of accurately measuring the moisture content of the evaporative cooling medium based on the change parameters and a preset compensation algorithm.

[0030] The present invention has the following beneficial effects:

[0031] 1. High-precision monitoring: Using the Karl Fischer coulometric measurement principle, combined with high-precision intermittent calibration technology, it can achieve rapid, high-precision online monitoring of trace water in the evaporative cooling medium. The measurement accuracy is high and the repeatability is good, providing accurate data support for the insulation performance evaluation of the cooling medium.

[0032] 2. High reliability: The system consists of multiple modules, which cooperate with each other and work together to ensure the high reliability of the monitoring device.

[0033] 3. Real-time alarm function: It has real-time alarm function. When the monitored water content exceeds the set alarm threshold, an alarm signal can be issued immediately.

[0034] 4. Data transmission and centralized monitoring: Using general communication protocols such as RS485 to output monitoring data and alarm information, it is convenient to seamlessly connect with the existing power monitoring system to achieve remote data transmission and centralized monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below with reference to the accompanying drawings and examples.

[0036] Figure 1 A schematic flow chart of an online monitoring method for water content in an evaporative cooling medium provided in an embodiment of the present invention.

[0037] Figure 2 This is a schematic diagram of the architecture of an online monitoring system for water content in decafluoropentane provided in an embodiment of the present invention.

[0038] Figure 3 Schematic diagram of the technical route of the decafluoropentane water content online monitoring system provided in an embodiment of the present invention.

[0039] Figure 4 Schematic diagram of the workflow of the high-precision intermittent calibration subsystem according to an embodiment of the present invention.

[0040] Figure 5 Schematic diagram of the composition of the continuous detection subsystem according to an embodiment of the present invention.

[0041] Figure 6 Schematic diagram of the workflow in the continuous detection subsystem.

[0042] Figure 7 A schematic structural diagram of an online monitoring system for water content in evaporative cooling medium provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0043] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] The various specific technical features in the various embodiments described in the specific implementation methods can be combined in various ways without contradiction. For example, different implementation methods can be formed by combining different specific technical features. In order to avoid unnecessary repetition, the various possible combinations of the specific technical features in the present invention will not be described separately.

[0045] It should also be noted here that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the solutions of the present invention are shown in the drawings, while other details that are not closely related to the present invention are omitted.

[0046] In addition, it should be noted that the terms "include", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the following description, the terms "first\second\..." involved are merely used to distinguish different objects and do not indicate that there is any similarity or connection between the objects. It should be understood that the directions described by the directional nouns such as "above", "below", "inside" and "outside" are all directions in normal use.

[0047] The present invention provides an online monitoring method for the water content of an evaporative cooling medium. Figure 1 As shown, Figure 1 A flow chart of an online monitoring method for the moisture content of an evaporative cooling medium provided in an embodiment of the present invention is provided, which is applied to an online monitoring system for the moisture content of an evaporative cooling medium. The monitoring system includes at least a low-precision continuous detection subsystem including a sensor based on the dielectric constant method and a high-precision intermittent calibration subsystem including a Karl Fischer test device. The monitoring method includes:

[0048] Step S101: monitor the moisture content of the evaporative cooling medium through the low-precision continuous detection subsystem, and obtain first data corresponding to the moisture content of the evaporative cooling medium through the sensor.

[0049] Step S102: When the first data indicates that the moisture content of the evaporative cooling medium has abnormal fluctuations, the high-precision intermittent calibration subsystem is started, and the moisture content of the evaporative cooling medium is accurately measured by the Karl Fischer test device to achieve automatic response and precise calibration.

[0050] It should be noted that the monitoring system includes at least 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 tester. The low-precision continuous detection subsystem, the high-precision intermittent calibration subsystem, the sensor, and the Karl Fischer tester can be determined based on actual circumstances and are not limited here. As an example, the sensor can include a capacitive sensor; the Karl Fischer tester can also be referred to as a Karl Fischer test system design. In practical applications, the monitoring system may also include an online moisture content monitoring platform, which is connected to the low-precision continuous detection subsystem and the high-precision intermittent calibration subsystem. As an example, the online moisture content monitoring platform may include online moisture content monitoring visualization, system operating status, moisture content, operating status monitoring, data monitoring, abnormal data alarms, user interaction, backend management, and a platform interface. As an example, the low-precision continuous detection subsystem may include continuous detection based on the dielectric constant method, a capacitive sensor, a control circuit, a signal processing circuit, a communication circuit, a real-time monitoring system, 24 / 7 real-time monitoring, and abnormal data alarms. The high-precision intermittent calibration subsystem can include a Karl Fischer test system design, 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. The power supply module design is primarily divided into two parts. The front end of this module primarily relies on a switching power supply system built on a chip, which has the function of stably converting the externally supplied DC voltage into the DC voltage required by the system. A relay is added to the second half of the circuit to achieve electrical isolation and prevent the switching power supply frequency from interfering with the collected signal. Since the microcontroller cannot directly process analog signals, a hardware circuit is required to convert the measured capacitance into an electrical signal that the microcontroller can process. This conversion circuit, typically designed using the RC oscillation method, converts the measured capacitance value into a frequency before processing. This circuit, designed around a chip, converts the capacitance measured by the plate capacitance sensor into a stable square wave output. This output is then filtered, amplified, and transmitted to the microcontroller through subsequent signal processing. For data transmission, the system chooses RS485 as the communication interface. This is because RS485 excels in long-distance transmission and multi-point communication systems, supporting distances up to 1200 meters and offering strong anti-interference capabilities. The RS485 communication interface uses differential signaling, which provides strong resistance to electromagnetic interference.

[0051] In step S101, the specific monitoring process for monitoring the moisture content of the evaporative cooling medium by the low-precision continuous detection subsystem can be determined based on actual conditions and is not limited here. As an example, the low-precision continuous detection subsystem can be responsible for monitoring the moisture content of the evaporative cooling medium continuously for 24 hours.

[0052] The specific process for obtaining the first data corresponding to the moisture content of the evaporative cooling medium via the sensor can be determined based on actual circumstances and is not limited herein. As an example, the first data can be moisture content data; the first data corresponding to the moisture content of the evaporative cooling medium obtained via the sensor can be obtained in real time using a sensing technology such as a dielectric constant method.

[0053] In step S102, the abnormal fluctuation in the moisture content of the evaporative cooling medium indicated by the first data can be determined based on actual conditions and is not limited herein. As an example, the abnormal fluctuation in the moisture content of the evaporative cooling medium indicated by the first data may include determining that the abnormal fluctuation in the moisture content of the evaporative cooling medium is indicated by the first data when the moisture content of the evaporative cooling medium exceeds a preset range.

[0054] The starting of the high-precision intermittent calibration subsystem may also be understood as triggering the high-precision intermittent calibration subsystem.

[0055] The specific measurement process for accurately measuring the moisture content of the evaporative cooling medium using the Karl Fischer test device can be determined based on actual circumstances and is not limited herein. As an example, the Karl Fischer test device includes a Karl Fischer reagent supply module, a reaction cell, and an electrode module; accurately measuring the moisture content of the evaporative cooling medium using the Karl Fischer test device can include delivering the Karl Fischer reagent to the reaction cell via the Karl Fischer reagent supply module for reaction, and monitoring the current of the electrode module; the current is proportional to the moisture content of the evaporative cooling medium; and accurately measuring the moisture content of the evaporative cooling medium based on the current.

[0056] In practical applications, the low-precision continuous detection subsystem is responsible for monitoring the moisture content of the evaporative cooling medium 24 hours a day and obtaining moisture content data in real time through sensing technologies such as the dielectric constant method.

[0057] The high-precision intermittent calibration subsystem automatically activates when it detects unusual data fluctuations, accurately measuring moisture content using the highly accurate Karl Fischer method. This subsystem features an automated response mechanism that promptly detects moisture anomalies and initiates high-precision calibration.

[0058] The online moisture content monitoring platform is the core of the system, responsible for real-time data acquisition, processing, and monitoring, while providing an intuitive user interface. Connected to a low-precision continuous detection subsystem, the monitoring platform provides 24-hour continuous monitoring of the moisture content of liquid media, acquiring real-time data via a dielectric constant capacitance sensor. Upon detecting abnormal fluctuations in moisture content, the monitoring platform automatically triggers the high-precision intermittent calibration subsystem, enabling precise measurement using the Karl Fischer method, achieving automated response and accurate calibration. The monitoring platform also includes data analysis and alarm functions to ensure system stability and efficiency, and facilitate remote management and monitoring.

[0059] An embodiment of the present invention provides a monitoring method, which obtains first data corresponding to the moisture content of the evaporative cooling medium through a sensor; when the first data indicates that the moisture content of the evaporative cooling medium has abnormally fluctuated, the high-precision intermittent calibration subsystem is activated, and the moisture content of the evaporative cooling medium is accurately measured through the Karl Fischer test device, thereby achieving automated response and precise calibration. That is, by adopting the Karl Fischer coulometric measurement principle in combination with high-precision intermittent calibration technology, rapid and high-precision online monitoring of trace moisture in the evaporative cooling medium can be achieved, with high measurement accuracy and good repeatability, providing accurate data support for the insulation performance evaluation of the cooling medium.

[0060] In some embodiments, the sensor includes a capacitive sensor; the first data includes a moisture concentration; and obtaining the first data corresponding to the moisture content of the evaporative cooling medium through the sensor includes:

[0061] determining a first capacitance value based on a change in moisture content of the evaporative cooling medium by the capacitance sensor;

[0062] performing conversion processing on the first capacitance value to obtain a frequency signal corresponding to the first capacitance value;

[0063] The moisture concentration is determined based on the frequency signal.

[0064] In this embodiment, the specific process for determining the first capacitance value based on the change in the moisture content of the evaporative cooling medium using the capacitive sensor can be determined based on actual conditions and is not limited herein. As an example, the moisture content of decafluoropentane is continuously monitored using a capacitive sensor based on a dielectric constant method. Changes in moisture content can cause changes in the dielectric constant of the medium, thereby affecting the capacitance value.

[0065] The conversion process of converting the first capacitance value to obtain the frequency signal corresponding to the first capacitance value can be determined according to actual conditions and is not limited here. As an example, the sensor converts the capacitance value into a frequency signal.

[0066] The specific determination process of determining the moisture concentration based on the frequency signal can be determined according to actual conditions and is not limited here. As an example, the real-time moisture concentration is calculated by an algorithm based on the frequency signal.

[0067] In practical applications, a capacitive sensor continuously monitors the moisture content in decafluoropentane based on the dielectric constant method. Changes in moisture content cause changes in the dielectric constant of the medium, which in turn affects the capacitance value. The sensor converts the capacitance value into a frequency signal, and a microcontroller uses an algorithm to calculate the real-time moisture concentration.

[0068] In some embodiments, the first data indicating abnormal fluctuations in the moisture content of the evaporative cooling medium includes:

[0069] When the moisture content of the evaporative cooling medium exceeds a preset range, it is determined that the first data represents an abnormal fluctuation in the moisture content of the evaporative cooling medium.

[0070] In this embodiment, the setting range can be determined according to actual conditions and is not limited here.

[0071] In practical applications, for example, when the system detects moisture content fluctuations outside a set range, it activates the Karl Fischer calibration device for precise measurement. The Karl Fischer method uses electrochemical reaction principles to accurately determine moisture content, and the real-time monitoring data is calibrated based on the calibration results to ensure the accuracy of the final data.

[0072] The system works automatically 24 hours a day, not only monitoring the moisture content in real time, but also triggering the Karl Fischer high-precision calibration system when abnormal fluctuations occur, ensuring continuous and accurate monitoring of the moisture content.

[0073] In some embodiments, the Karl Fischer test device includes a Karl Fischer reagent supply module, a reaction cell, and an electrode module; and accurately measuring the moisture content of the evaporative cooling medium using the Karl Fischer test device includes:

[0074] The Karl Fischer reagent is delivered 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;

[0075] The moisture content of the evaporative cooling medium is accurately measured based on the current.

[0076] In this embodiment, the current is proportional to the moisture content of the evaporative cooling medium, which can be understood as follows: 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.

[0077] The Karl Fischer reagent supply module is used to deliver the Karl Fischer reagent to the reaction cell for reaction. Monitoring the current of the electrode module can be understood as the Karl Fischer reagent supply module being responsible for accurately delivering the Karl Fischer reagent to the reaction cell to ensure the smooth progress of the reaction, thereby monitoring the current in real time.

[0078] Accurately measuring the moisture content of the evaporative cooling medium based on the current can be understood as accurately detecting the concentration of moisture through real-time monitoring of the current.

[0079] In actual applications, 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 stirring system are responsible for accommodating the decafluoropentane sample and Karl Fischer reagent and carrying out the reaction; the electrode system uses metal electrodes as indicators of electrochemical reactions. The magnitude of the current is proportional to the water content. Therefore, through real-time monitoring of the current, the system can accurately detect the water concentration.

[0080] In some embodiments, the Karl Fischer test apparatus further includes a temperature and pressure compensation module, and the method includes:

[0081] Real-time monitoring of the temperature and pressure parameters of the reaction tank by the temperature and pressure compensation module;

[0082] The result of accurately measuring the moisture content of the evaporative cooling medium is corrected based on the change parameter and a preset compensation algorithm.

[0083] In this embodiment, the Karl Fischer test apparatus further includes a temperature and pressure compensation module. The temperature and pressure compensation module can be determined based on actual conditions 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.

[0084] The temperature and pressure compensation module is used to monitor the temperature and pressure change parameters of the reaction pool in real time, which can be understood as the temperature and pressure compensation system being used to monitor the temperature and pressure change of the reaction pool in real time.

[0085] Correcting the result of accurately measuring the moisture content of the evaporative cooling medium based on the variation parameter and the preset compensation algorithm can be understood as correcting the measurement result by using a temperature compensation algorithm.

[0086] In practical applications, the control and data acquisition module is the "brain" of the entire online testing system, responsible for coordinating the operations of various modules. This module uses a microcontroller to provide real-time monitoring and control of reagent delivery, reaction cell temperature and pressure, and electrode signals. The temperature and pressure compensation system monitors changes in the reaction cell's temperature and pressure in real time and corrects the measurement results using a temperature compensation algorithm. The output and communication interface uses RS485 to ensure stable data transmission with the host computer.

[0087] In practical applications, in order to solve the problem that excessive water content affects the insulation performance of the cooling medium, the present invention has developed and designed an online monitoring device 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 set of online monitoring devices for the water content of decafluoropentane that are highly reliable and easy to install. The core architecture of the system is divided into three parts: a low-precision continuous detection subsystem, a high-precision intermittent calibration subsystem and a water content online monitoring platform. The system architecture is as follows: Figure 2 shown. Figure 2 This is a schematic diagram of the architecture of an online monitoring system for water content in decafluoropentane provided in an embodiment of the present invention.

[0088] The low-precision continuous detection subsystem is responsible for monitoring the moisture content of the evaporative cooling medium 24 hours a day and obtaining real-time moisture content data through sensing technologies such as the dielectric constant method.

[0089] The high-precision intermittent calibration subsystem automatically activates when it detects unusual data fluctuations, accurately measuring moisture content using the highly accurate Karl Fischer method. This subsystem features an automated response mechanism that promptly detects moisture anomalies and initiates high-precision calibration.

[0090] The online moisture content monitoring platform is the core of the system, responsible for real-time data acquisition, processing, and monitoring, while providing an intuitive user interface. Connected to a low-precision continuous detection subsystem, the monitoring platform provides 24-hour continuous monitoring of the moisture content of liquid media, acquiring real-time data via a dielectric constant capacitance sensor. Upon detecting abnormal fluctuations in moisture content, the monitoring platform automatically triggers the high-precision intermittent calibration subsystem, enabling precise measurement using the Karl Fischer method, achieving automated response and accurate calibration. The monitoring platform also includes data analysis and alarm functions to ensure system stability and efficiency, and facilitate remote management and monitoring.

[0091] The technical route of this project is to adopt a dual monitoring mechanism, combining real-time monitoring with high-precision calibration, to ensure that while meeting the needs of online monitoring, it can provide accurate moisture content data under abnormal conditions. Figure 3 shown. Figure 3 Schematic diagram of the technical route of the decafluoropentane water content online monitoring system provided in an embodiment of the present invention.

[0092] Real-time monitoring technology: Based on the dielectric constant method, a capacitive sensor continuously monitors the moisture content in decafluoropentane. Changes in moisture content cause changes in the dielectric constant of the medium, which in turn affects the capacitance value. The sensor converts the capacitance value into a frequency signal, and a microcontroller uses an algorithm to calculate the real-time moisture concentration.

[0093] High-precision Karl Fischer calibration technology: When the system detects moisture content fluctuations outside the set range, the Karl Fischer calibration device is activated for precise measurement. The Karl Fischer method uses electrochemical reaction principles to accurately determine moisture content. The real-time monitoring data is calibrated based on the calibration results to ensure the accuracy of the final data.

[0094] Automated monitoring and adjustment: The system works automatically 24 hours a day, not only monitoring moisture content in real time, but also triggering the Karl Fischer high-precision calibration system when abnormal fluctuations occur, ensuring continuous and accurate monitoring of moisture content.

[0095] High-precision intermittent calibration subsystem: To ensure the long-term stability and measurement accuracy of the monitoring device, the high-precision intermittent calibration subsystem uses Karl Fischer high-precision calibration technology. The online Karl Fischer test system is designed to meet the demand for accurate measurement of trace moisture. The key components of the system include the following:

[0096] 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 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 water content. Therefore, by real-time monitoring of the current, the system can accurately detect the water concentration.

[0097] The control and data acquisition module is the "brain" of the entire online testing system, responsible for coordinating the operations of various modules. It uses a microcontroller to monitor and control reagent delivery, reaction cell temperature and pressure, and electrode signals in real time. The temperature and pressure compensation system monitors changes in the reaction cell's temperature and pressure in real time and corrects the measurement results using a temperature compensation algorithm. The output and communication interface uses RS485 to ensure stable data transmission with the host computer.

[0098] Workflow: The workflow of the online Karl Fischer test system is divided into multiple steps, each of which is completed under the precise control of the system to ensure the accuracy and stability of moisture measurement. Figure 4 shown. Figure 4This figure illustrates the workflow of the high-precision intermittent calibration subsystem in an embodiment of the present invention. Upon system startup, the system performs a self-test procedure, checking the hardware status of the reagent module, electrode contact, reaction cell temperature and pressure, and other related parameters. After the self-test passes, the system initializes the sensors and actuators, sets parameters such as reagent flow, temperature, and pressure, and imports them into the control system. The system then enters standby mode and prepares for testing. After the decafluoropentane sample enters the reaction cell, it mixes with an automatically adjusted amount of Karl Fischer reagent, initiating the moisture detection reaction.

[0099] Electrodes monitor the current changes during the electrolysis reaction in real time. The current magnitude is proportional to the moisture concentration. The control system collects the electrode signals and calculates the moisture concentration based on temperature, pressure compensation, and calibration data. The electrode signals are converted into digital signals by the data acquisition module and transmitted to the control system. The real-time current, temperature, and pressure data, along with calibration factors, are used to calculate and correct the moisture content. When the reaction reaches its endpoint, the system stops supplying reagents, the electrode signals stabilize, and the moisture measurement is complete. The results are then output to the host computer via a display or communication interface. Real-time data can be viewed and automatically recorded for subsequent analysis.

[0100] Low-precision continuous monitoring subsystem: Components of the continuous detection subsystem include Figure 5 As shown, Figure 5 This is a schematic diagram of the continuous detection subsystem according to an embodiment of the present invention. The specific components are designed as follows:

[0101] (1) Power module.

[0102] The power module design consists of two main parts. The front-end of the module relies primarily on a switching power supply system built on the chip, which stably converts an externally supplied DC voltage into the DC voltage required by the system. A relay is added to the back-end circuit to provide electrical isolation and prevent the switching power supply frequency from interfering with the frequency of the acquired signal.

[0103] (2) Signal processing circuit.

[0104] Since the microcontroller cannot directly process analog signals, it is necessary to design a hardware circuit to convert the measured capacitance into an electrical signal that can be processed by the microcontroller. 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 before processing. This circuit can convert the capacitance value measured by the plate capacitance sensor into a stable square wave output, which is then filtered, amplified, and processed by subsequent signal circuits before being transmitted to the microcontroller.

[0105] (3) Communication circuit.

[0106] For data transmission, the system chose RS485 as the communication interface. This is because RS485 excels in long-distance transmission and multi-point communication systems, supporting distances up to 1200 meters and offering strong anti-interference capabilities. The RS485 communication interface uses differential signal transmission, which provides strong resistance to electromagnetic interference.

[0107] Workflow:

[0108] In the continuous detection subsystem, the workflow diagram is as follows: Figure 6 As shown, Figure 6 Schematic diagram of the workflow in the continuous detection subsystem.

[0109] During system startup, the power module provides a stable DC voltage, the relay is connected, and power is supplied directly by the switching power supply. After completing a hardware self-test, loading system parameters, and initializing sensors, the system enters standby mode. The system continuously samples the changes in the dielectric constant of decafluoropentane using a capacitive sensor, converting the capacitance value into a frequency signal. A low-pass filter and inverter are used to ensure signal stability and accuracy. To distinguish between dissolved and free water, the system uses different calibration algorithms: a linear relationship for dissolved water and a nonlinear model for free water.

[0110] The signal processing and calculation section uses a single-chip microcomputer to precisely process the frequency signal. A linear conversion formula is used for dissolved water, and a nonlinear fitting algorithm is employed for free water. Temperature compensation and noise reduction are also incorporated to enhance measurement accuracy. The calculated water concentration data is transmitted to a host computer via an RS485 interface for further analysis and display. The system monitors the data quality of the capacitive sensor and signal processing module in real time, issuing an alarm when an anomaly is detected, and monitors the communication module to ensure data transmission stability. The system also features periodic calibration and self-test functions, regularly checking the operating status of the sensor and signal processing circuitry to ensure they are operating within the standard range. Any deviations detected automatically trigger a calibration process, updating relevant parameters to ensure long-term accuracy.

[0111] The system and method for online monitoring of the moisture content of evaporative cooling medium provided by the present invention have the following advantages:

[0112] 1. High-precision monitoring: Using the Karl Fischer coulometric measurement principle, combined with high-precision intermittent calibration technology, it can achieve rapid, high-precision online monitoring of trace water in the evaporative cooling medium. The measurement accuracy is high and the repeatability is good, providing accurate data support for the insulation performance evaluation of the cooling medium.

[0113] 2. High reliability: The system consists of multiple modules, which cooperate with each other and work together to ensure the high reliability of the monitoring device.

[0114] 3. Real-time alarm function: It has real-time alarm function. When the monitored water content exceeds the set alarm threshold, an alarm signal can be issued immediately.

[0115] 4. Data transmission and centralized monitoring: Using general communication protocols such as RS485 to output monitoring data and alarm information, it is convenient to seamlessly connect with the existing power monitoring system to achieve remote data transmission and centralized monitoring.

[0116] The embodiment of the present invention also provides an online monitoring system 700 for the water content of an evaporative cooling medium. Figure 7 As shown, Figure 7 A schematic structural diagram of an online monitoring system for water content of an evaporative cooling medium provided in an embodiment of the present invention is provided. The structure and functions of the monitoring system are exemplarily described below in conjunction with various embodiments.

[0117] 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 a water content online detection platform 702; the water content online detection platform 702 is connected to the low-precision continuous detection subsystem 701 and the high-precision intermittent calibration subsystem 703 respectively; wherein,

[0118] The low-precision continuous detection subsystem 701 is used to monitor the moisture content of the evaporative cooling medium and obtain first data corresponding to the moisture content of the evaporative cooling medium through the sensor;

[0119] The moisture content online detection platform 702 is configured to activate the high-precision intermittent calibration subsystem when the first data indicates that the moisture content of the evaporative cooling medium fluctuates abnormally;

[0120] The high-precision intermittent calibration subsystem 703 is used to accurately measure the moisture content of the evaporative cooling medium through the Karl Fischer test device to achieve automatic response and precise calibration.

[0121] It should be noted that the monitoring system includes at least 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 tester. The low-precision continuous detection subsystem, the high-precision intermittent calibration subsystem, the sensor, and the Karl Fischer tester can be determined based on actual circumstances and are not limited here. As an example, the sensor can include a capacitive sensor; the Karl Fischer tester can also be referred to as a Karl Fischer test system design. In practical applications, the monitoring system may also include an online moisture content monitoring platform, which is connected to the low-precision continuous detection subsystem and the high-precision intermittent calibration subsystem. As an example, the online moisture content monitoring platform may include online moisture content monitoring visualization, system operating status, moisture content, operating status monitoring, data monitoring, abnormal data alarms, user interaction, backend management, and a platform interface. As an example, the low-precision continuous detection subsystem may include continuous detection based on the dielectric constant method, a capacitive sensor, a control circuit, a signal processing circuit, a communication circuit, a real-time monitoring system, 24 / 7 real-time monitoring, and abnormal data alarms. The high-precision intermittent calibration subsystem can include a Karl Fischer test system design, 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. The power supply module design is primarily divided into two parts. The front end of this module primarily relies on a switching power supply system built on a chip, which has the function of stably converting the externally supplied DC voltage into the DC voltage required by the system. A relay is added to the second half of the circuit to achieve electrical isolation and prevent the switching power supply frequency from interfering with the collected signal. Since the microcontroller cannot directly process analog signals, a hardware circuit is required to convert the measured capacitance into an electrical signal that the microcontroller can process. This conversion circuit, typically designed using the RC oscillation method, converts the measured capacitance value into a frequency before processing. This circuit, designed around a chip, converts the capacitance measured by the plate capacitance sensor into a stable square wave output, which is then filtered, amplified, and transmitted to the microcontroller through subsequent signal processing. For data transmission, the system chooses RS485 as the communication interface. This is because RS485 excels in long-distance transmission and multi-point communication systems, supporting long distances and offering strong anti-interference capabilities. The RS485 communication interface uses differential signaling, which provides strong resistance to electromagnetic interference.

[0122] In some embodiments, the sensor comprises a capacitive sensor; the first data comprises a moisture concentration;

[0123] The low-precision continuous detection subsystem 701 is further configured to determine a first capacitance value based on a change in the moisture content of the evaporative cooling medium using 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.

[0124] In this embodiment, the specific process for determining the first capacitance value based on the change in the moisture content of the evaporative cooling medium using the capacitive sensor can be determined based on actual conditions and is not limited herein. As an example, the moisture content of decafluoropentane is continuously monitored using a capacitive sensor based on a dielectric constant method. Changes in moisture content can cause changes in the dielectric constant of the medium, thereby affecting the capacitance value.

[0125] The conversion process of converting the first capacitance value to obtain the frequency signal corresponding to the first capacitance value can be determined according to actual conditions and is not limited here. As an example, the sensor converts the capacitance value into a frequency signal.

[0126] The specific determination process of determining the moisture concentration based on the frequency signal can be determined according to actual conditions and is not limited here. As an example, the real-time moisture concentration is calculated by an algorithm based on the frequency signal.

[0127] In practical applications, a capacitive sensor continuously monitors the moisture content in decafluoropentane based on the dielectric constant method. Changes in moisture content cause changes in the dielectric constant of the medium, which in turn affects the capacitance value. The sensor converts the capacitance value into a frequency signal, and a microcontroller uses an algorithm to calculate the real-time moisture concentration.

[0128] In some embodiments, the moisture content online 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.

[0129] In this embodiment, the setting range can be determined according to actual conditions and is not limited here.

[0130] In practical applications, for example, when the system detects moisture content fluctuations outside a set range, it activates the Karl Fischer calibration device for precise measurement. The Karl Fischer method uses electrochemical reaction principles to accurately determine moisture content, and the real-time monitoring data is calibrated based on the calibration results to ensure the accuracy of the final data.

[0131] The system works automatically 24 hours a day, not only monitoring the moisture content in real time, but also triggering the Karl Fischer high-precision calibration system when abnormal fluctuations occur, ensuring continuous and accurate monitoring of the moisture content.

[0132] In some embodiments, the Karl Fischer test device includes a Karl Fischer reagent supply module, a reaction cell, and an electrode module;

[0133] The high-precision intermittent calibration subsystem 703 is also used to transport the Karl Fischer reagent to the reaction cell through the Karl Fischer reagent supply module for reaction, 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.

[0134] In this embodiment, the current is proportional to the moisture content of the evaporative cooling medium, which can be understood as follows: 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.

[0135] The Karl Fischer reagent supply module is used to deliver the Karl Fischer reagent to the reaction cell for reaction. Monitoring the current of the electrode module can be understood as the Karl Fischer reagent supply module being responsible for accurately delivering the Karl Fischer reagent to the reaction cell to ensure the smooth progress of the reaction, thereby monitoring the current in real time.

[0136] Accurately measuring the moisture content of the evaporative cooling medium based on the current can be understood as accurately detecting the concentration of moisture through real-time monitoring of the current.

[0137] In actual applications, 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 stirring system are responsible for accommodating the decafluoropentane sample and Karl Fischer reagent and carrying out the reaction; the electrode system uses metal electrodes as indicators of electrochemical reactions. The magnitude of the current is proportional to the water content. Therefore, through real-time monitoring of the current, the system can accurately detect the water concentration.

[0138] In some embodiments, the Karl Fischer testing device further includes a temperature and pressure compensation module;

[0139] The temperature and pressure compensation module is used to monitor the change parameters of the temperature and pressure of the reaction tank in real time; and to correct the result of accurately measuring the moisture content of the evaporative cooling medium based on the change parameters and a preset compensation algorithm.

[0140] In this embodiment, the Karl Fischer test apparatus further includes a temperature and pressure compensation module. The temperature and pressure compensation module can be determined based on actual conditions 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.

[0141] The temperature and pressure compensation module is used to monitor the temperature and pressure change parameters of the reaction pool in real time, which can be understood as the temperature and pressure compensation system being used to monitor the temperature and pressure change of the reaction pool in real time.

[0142] Correcting the result of accurately measuring the moisture content of the evaporative cooling medium based on the variation parameter and the preset compensation algorithm can be understood as correcting the measurement result by using a temperature compensation algorithm.

[0143] In practical applications, the control and data acquisition module is the "brain" of the entire online testing system, responsible for coordinating the operations of various modules. This module uses a microcontroller to provide real-time monitoring and control of reagent delivery, reaction cell temperature and pressure, and electrode signals. The temperature and pressure compensation system monitors changes in the reaction cell's temperature and pressure in real time and corrects the measurement results using a temperature compensation algorithm. The output and communication interface uses RS485 to ensure stable data transmission with the host computer.

[0144] In practical applications, this invention combines online liquid medium moisture content detection technology with the principles of high-precision calibration measurement of solution trace water content to develop a highly reliable and easy-to-install online decafluoropentane moisture content monitoring system. The system's core architecture consists of three components: a low-precision continuous detection subsystem, a high-precision intermittent calibration subsystem, and an online moisture content monitoring platform. The low-precision continuous detection subsystem is responsible for 24-hour uninterrupted monitoring of the evaporative cooling medium's moisture content, acquiring real-time moisture content data through sensing technologies such as the dielectric constant method.

[0145] The high-precision intermittent calibration subsystem automatically activates when it detects unusual data fluctuations, accurately measuring moisture content using the highly accurate Karl Fischer method. This subsystem features an automated response mechanism that promptly detects moisture anomalies and initiates high-precision calibration.

[0146] The online moisture content monitoring platform is the core of this system, responsible for real-time data acquisition, processing and monitoring, and providing users with an intuitive operating interface. The monitoring platform is connected to the low-precision continuous detection subsystem, monitoring the moisture content of the liquid medium 24 hours a day, and obtaining data in real time through the dielectric constant method capacitance sensor. When abnormal fluctuations in moisture content are detected, the monitoring platform will automatically trigger the high-precision intermittent calibration subsystem, enable the Karl Fischer method for precise measurement, and achieve automated response and precise calibration. The 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 needs of accurate measurement of trace moisture. The key components of the system include the following:

[0147] 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 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 water content. Therefore, by real-time monitoring of the current, the system can accurately detect the water concentration.

[0148] The control and data acquisition module is the "brain" of the entire online testing system, responsible for coordinating the operations of various modules. It uses a microcontroller to monitor and control reagent delivery, reaction cell temperature and pressure, and electrode signals in real time. The temperature and pressure compensation system monitors changes in the reaction cell's temperature and pressure in real time and corrects the measurement results using a temperature compensation algorithm. The output and communication interface uses RS485 to ensure stable data transmission with the host computer.

[0149] The low-precision continuous monitoring subsystem can also include a power supply module, signal processing circuitry, and communication circuitry. The power supply module design primarily consists of two parts. The front end of this module relies primarily on a switching power supply system built on a chip, which stably converts an externally supplied DC voltage into the system's required DC voltage. A relay is added to the back half of the circuit to provide electrical isolation and prevent the switching power supply frequency from interfering with the acquired signal's frequency. Since the microcontroller cannot directly process analog signals, the signal processing circuit requires a hardware circuit to convert the measured capacitance into an electrical signal that the microcontroller can process. This conversion circuit, typically designed using the RC oscillation method, converts the measured capacitance value into a frequency before processing. This circuit converts the capacitance measured by the plate capacitance sensor into a stable square wave output, which is then filtered, amplified, and transmitted to the microcontroller through subsequent signal processing. For the communication circuit, RS485 is chosen as the communication interface for data transmission. This is because RS485 excels in long-distance transmission and multi-point communication systems, supporting long distances and offering strong interference resistance. The RS485 communication interface adopts differential signal transmission and has strong anti-electromagnetic interference capability.

[0150] During system startup, the power module provides a stable DC voltage, the relay is connected, and power is supplied directly by the switching power supply. After completing a hardware self-test, loading system parameters, and initializing sensors, the system enters standby mode. The system continuously samples the changes in the dielectric constant of decafluoropentane using a capacitive sensor, converting the capacitance value into a frequency signal. A low-pass filter and inverter are used to ensure signal stability and accuracy. To distinguish between dissolved and free water, the system uses different calibration algorithms: a linear relationship for dissolved water and a nonlinear model for free water.

[0151] The signal processing and calculation section uses a single-chip microcomputer to precisely process the frequency signal. A linear conversion formula is used for dissolved water, and a nonlinear fitting algorithm is employed for free water. Temperature compensation and noise reduction are also incorporated to enhance measurement accuracy. The calculated water concentration data is transmitted to a host computer via an RS485 interface for further analysis and display. The system monitors the data quality of the capacitive sensor and signal processing module in real time, issuing an alarm when an anomaly is detected, and monitors the communication module to ensure data transmission stability. The system also features periodic calibration and self-test functions, regularly checking the operating status of the sensor and signal processing circuitry to ensure they are operating within the standard range. Any deviations detected automatically trigger a calibration process, updating relevant parameters to ensure long-term accuracy.

[0152] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. An online monitoring method for water content of evaporative cooling medium, characterized in that: The monitoring method is applied to an online monitoring system for the moisture content of an evaporative cooling medium; the monitoring system comprises at least a low-precision continuous detection subsystem including a sensor based on a dielectric constant method and a high-precision intermittent calibration subsystem including a Karl Fischer test device; the monitoring method comprises: 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; When the first data indicates that the moisture content of the evaporative cooling medium has abnormally fluctuated, the high-precision intermittent calibration subsystem is activated, and the moisture content of the evaporative cooling medium is accurately measured using the Karl Fischer test device; The sensor includes a capacitive sensor; the first data includes a moisture concentration; and obtaining the first data corresponding to the moisture content of the evaporative cooling medium through the sensor includes: determining a first capacitance value based on a change in moisture content of the evaporative cooling medium by the capacitance sensor; performing conversion processing 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; The Karl Fischer test device includes a Karl Fischer reagent supply module, a reaction cell, and an electrode module; the Karl Fischer test device is used to accurately measure the moisture content of the evaporative cooling medium, including: The Karl Fischer reagent is delivered 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; The moisture content of the evaporative cooling medium is accurately measured based on the current.

2. The method for online monitoring of water content of evaporative cooling medium according to claim 1, characterized in that: The first data indicating abnormal fluctuations in the moisture content of the evaporative cooling medium includes: When the moisture content of the evaporative cooling medium exceeds a preset range, it is determined that the first data represents an abnormal fluctuation in the moisture content of the evaporative cooling medium.

3. The method for online monitoring of water content of evaporative cooling medium according to claim 1, characterized in that: The Karl Fischer test device also includes a temperature and pressure compensation module, including: Real-time monitoring of the temperature and pressure parameters of the reaction tank by the temperature and pressure compensation module; The result of accurately measuring the moisture content of the evaporative cooling medium is corrected based on the change parameter and a preset compensation algorithm.

4. The method for online monitoring of water content of evaporative cooling medium according to claim 1, 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 online water content detection platform; the online water content detection platform is connected to the low-precision continuous detection subsystem and the high-precision intermittent calibration subsystem respectively; The low-precision continuous detection subsystem is used to monitor the moisture content of the evaporative cooling medium and obtain first data corresponding to the moisture content of the evaporative cooling medium through the sensor; The moisture content online detection platform is configured to activate the high-precision intermittent calibration subsystem when the first data indicates that the moisture content of the evaporative cooling medium fluctuates abnormally; The high-precision intermittent calibration subsystem is used to accurately measure the moisture content of the evaporative cooling medium using the Karl Fischer test device.

5. The method for online monitoring of water content of evaporative cooling medium according to claim 4, characterized in that: The sensor includes a capacitive sensor; the first data includes water concentration; The low-precision continuous detection subsystem is further used to determine a first capacitance value based on a change in the moisture content of the evaporative cooling medium through the capacitance sensor; convert 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.

6. The method for online monitoring of water content of evaporative cooling medium according to claim 4, characterized in that: The moisture content online 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.

7. The method for online monitoring of water content of evaporative cooling medium according to claim 4, characterized in that: 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 used to transport the Karl Fischer reagent to the reaction cell through the Karl Fischer reagent supply module for reaction, 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.

8. The method for online monitoring of water content of evaporative cooling medium according to claim 7, characterized in that: The Karl Fischer test device also includes a temperature and pressure compensation module; The temperature and pressure compensation module is used to monitor the change parameters of the temperature and pressure of the reaction tank in real time; and to correct the result of accurately measuring the moisture content of the evaporative cooling medium based on the change parameters and a preset compensation algorithm.

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