Comprehensive circulating water analyzer based on titrimetric analysis method

Abstract

The invention discloses a comprehensive circulating water analyzer based on a titrimetric analysis method, and belongs to the technical field of power plant water treatment. The analyzer is composed of a multi-channel titration module, an intelligent temperature control reaction kettle, an optical detection array and a central processing system, and through an integrated electrode-optical composite sensing technology, a dynamic temperature compensation algorithm and a deep learning end point prediction model, the problem that in traditional circulating water detection, the multi-parameter measurement precision is low (the error gt; 2%), the anti-interference capability is poor (the turbidity is gt; the innovation points comprise (1) a three-axis linkage microtitration mechanism (the precision is 0.1 microliter) and an anti-crystallization needle head design are combined to improve the reagent feeding stability by 50%, (2) a double-layer eddy current temperature control reaction system (the temperature control precision is + / -0.1 DEG C) and eliminate the interference of temperature fluctuation on the titration reaction, and (3) a transfer learning-based end point prediction algorithm (error 1t, error 1t, error 1t, error 1t, error 1t, error 1t, error 1t, error 1t, error 1t, error 1t, error 1t, error 1t, error 1t). The device can synchronously detect eight indexes such as pH, Cl, SO, total hardness and the like, supports remote monitoring and automatic dosing of chemicals, is suitable for real-time monitoring of circulating cooling water of a power plant, the detection precision reaches + / -0.3%, and the single detection time is 1t, 2.5 minutes.

Description

Technical Field

[0001] The present invention belongs to the technical field of power plant water quality monitoring and analysis, and particularly relates to a comprehensive circulating water analyzer based on titrimetric analysis. This analyzer is mainly used for rapid and accurate detection of multiple parameters of the circulating water quality in power plants, can reflect the water quality status of the circulating water in real time and comprehensively, and provides important data support and decision-making basis for the safe, stable and efficient operation of the power plant circulating water system. Background Art

[0002] In the production process of power plants, the circulating water system plays a crucial role. It is mainly used to cool the exhausted steam discharged from the steam turbine, condense the exhausted steam into water and re-participate in the thermal cycle to improve the thermal efficiency of the power plant. At the same time, the circulating water also provides a cooling medium for other equipment in the power plant such as condensers and coolers to ensure the normal operation of these equipment. Therefore, the water quality of the circulating water directly affects the service life, operation efficiency and energy consumption of power plant equipment.

[0003] At present, the detection of circulating water quality in power plants mainly adopts traditional chemical analysis methods and some single-parameter detection instruments. Traditional chemical analysis methods require manual sampling, reagent preparation, titration and other operations, which are not only cumbersome, time-consuming for analysis, but also easily affected by human factors, resulting in low accuracy and reliability of the detection results. In addition, this method cannot achieve real-time online monitoring, cannot timely reflect the changes in the circulating water quality, and is not conducive to the timely and effective adjustment and control of the power plant circulating water system.

[0004] Existing single-parameter detection instruments, such as hardness meters, alkalinity meters, chloride ion analyzers, etc., although they can achieve rapid detection of a specific water quality parameter, each instrument can only detect one parameter. To comprehensively understand the water quality status of the circulating water, multiple different instruments need to be equipped, which not only increases the equipment cost and floor area, but also the data between the instruments lacks relevance and is difficult to conduct comprehensive analysis and judgment. At the same time, the operation and maintenance of these instruments also require professional personnel, increasing the labor cost and management difficulty.

[0005] With the continuous improvement of the automation level of power plants and the increasingly strict requirements for energy conservation and emission reduction, it becomes more and more important to monitor and analyze the circulating water quality in real time, accurately and comprehensively. Therefore, developing a comprehensive circulating water analyzer that can integrate multiple detection functions, is easy to operate, has high detection accuracy and can perform real-time online monitoring has broad market prospects and important practical significance. Summary of the Invention

[0006] The object of the present invention is to provide a comprehensive circulating water analyzer based on titrimetric analysis method, so as to solve the problems existing in the existing methods and instruments for detecting the quality of circulating water in power plants, such as cumbersome operation, single detection parameter, high cost, inability to monitor in real time online, etc., and realize the rapid, accurate and comprehensive detection of various water quality parameters of circulating water in power plants, providing reliable technical support for the optimized operation of the circulating water system in power plants.

[0007] The comprehensive circulating water analyzer based on titrimetric analysis method of the present invention mainly consists of five major parts: a sampling system, a titration system, a detection system, a control system and a data processing system. Each system cooperates with each other to jointly complete the detection and analysis of the quality of circulating water.

[0008] 1. Sampling system: The main function of the sampling system is to collect water samples from the circulating water pipeline of the power plant and accurately and stably transport them to the reaction vessel. This system includes a water sample collection device, a sampling pipeline, a sampling pump and a flow control device.

[0009] Water sample collection device: Adopting the multi-point sampling method, multiple sampling ports are set at different positions of the circulating water pipeline, and the water samples at different positions are collected into a mixer through the sampling pipeline for full mixing to ensure that the collected water samples are representative. A filtering device is installed at the sampling port, which can filter out large particle impurities and suspended matters in the water sample to prevent them from entering the analyzer and damaging the instrument.

[0010] Sampling pipeline: It is made of corrosion-resistant and high-pressure-resistant materials, such as polytetrafluoroethylene pipes, to ensure that the water sample will not be contaminated and lost during transportation. Valves and joints are also installed on the sampling pipeline to facilitate the cleaning and maintenance of the pipeline.

[0011] Sampling pump: A high-precision peristaltic pump is selected, which has the advantages of stable flow rate, good repeatability and corrosion resistance. The peristaltic pump realizes the transportation of the water sample by squeezing the hose, and can accurately control the sampling volume and sampling speed to ensure that the water sample volume for each detection is consistent, providing an accurate basis for subsequent titration analysis.

[0012] Flow control device: It adopts a closed-loop control system composed of a flow sensor and a regulating valve to monitor the sampling flow rate in real time and automatically adjust the opening degree of the regulating valve according to the set value to ensure the stability and accuracy of the sampling flow rate.

[0013] 2. Titration system: The titration system is one of the core parts of this analyzer. Its main function is to accurately add the corresponding titration reagent to the water sample in the reaction vessel according to different detection parameters to complete the quantitative analysis of the water quality parameters. This system includes a reagent storage device, a titration pipeline, a titration pump and a titration control device.

[0014] Reagent storage device: It consists of multiple independent reagent bottles, and each reagent bottle is used to store a specific titration reagent, such as EDTA standard solution for hardness detection, hydrochloric acid standard solution for alkalinity detection, silver nitrate standard solution for chloride ion detection, etc. The reagent bottles are designed to be sealed to prevent reagent volatilization and external contamination. At the same time, a liquid level sensor is equipped to monitor the liquid level of the reagent in real time. When the reagent liquid level is lower than the set value, an alarm signal is sent to remind the operator to replenish the reagent in time.

[0015] Titration pipeline: It is connected to the reagent storage device and the reaction vessel, and is made of corrosion-resistant and acid-alkali-resistant materials, such as glass tubes or ceramic tubes. An electromagnetic valve is installed on the titration pipeline to control the dripping and stopping of the reagent.

[0016] Titration pump: A high-precision syringe pump is selected, which can accurately control the dripping volume and dripping speed of the reagent. The syringe pump drives the piston to move through a stepper motor, sucks the reagent from the reagent bottle and transports it to the titration pipeline, and then controls the dripping of the reagent through the electromagnetic valve. The dripping accuracy of the titration pump can reach the microliter level, which can meet the requirements of different detection parameters.

[0017] Titration control device: It adopts a control system composed of a programmable logic controller (PLC) and a titration end-point detection sensor. According to different detection parameters, it automatically controls the start, stop and dripping speed of the titration pump, as well as the opening and closing of the electromagnetic valve. The titration end-point detection sensor adopts different detection methods according to different titration reaction principles. For example, in potentiometric titration, a potential sensor is used to detect the change of electrode potential, and in acid-base titration, a pH sensor is used to detect the change of solution pH value. When the titration end-point is reached, the sensor transmits the signal to the PLC, and the PLC immediately controls the titration pump to stop dripping the reagent and records the dosage of the titrant.

[0018] 3. Detection system: The main function of the detection system is to monitor the physical and chemical changes of the water sample during the titration process in real time, and convert these changes into electrical signals or optical signals for output, providing a basis for the judgment of the titration end-point and the calculation of water quality parameters. The system includes various types of sensors, such as potential sensors, pH sensors, temperature sensors, turbidity sensors, etc.

[0019] Potential sensor: It is used to detect the change of electrode potential in potentiometric titration, and determines the titration end-point according to the sudden change of electrode potential. The potential sensor has the advantages of high sensitivity, fast response speed and good stability, and can accurately detect the tiny potential changes during the titration process.

[0020] pH sensor: It is used to detect the change of solution pH value in acid-base titration, and determines the titration end-point according to the sudden change of pH value. The pH sensor adopts a glass electrode or a composite electrode, and has the characteristics of wide measurement range, high precision and strong anti-interference ability.

[0021] Temperature sensor: It is used to monitor the temperature of the water sample in the reaction vessel. Since the change in temperature will affect the speed and equilibrium of the titration reaction, thus affecting the accuracy of the detection result. The temperature sensor adopts a high-precision thermistor or thermocouple, which can accurately measure the temperature of the water sample in real time and transmit the temperature signal to the control system. The control system performs temperature compensation on the detection result according to the temperature change.

[0022] Turbidity sensor: It is used to detect the turbidity of the water sample. Turbidity is an important indicator reflecting the content of suspended solids in water. The turbidity sensor adopts the principle of scattered light and determines the turbidity value by measuring the degree of light scattering of the water sample. The turbidity sensor has the advantages of a wide measurement range, high precision, and strong anti-interference ability, and can monitor the turbidity change of the water sample in real time.

[0023] Control system: The control system is the brain of the entire analyzer. Its main function is to coordinate the work of the sample injection system, titration system, and detection system to achieve automatic control and management of the analyzer. This system includes a programmable logic controller (PLC), a human-machine interface (HMI), and an electrical control cabinet.

[0024] Programmable logic controller (PLC): A high-performance industrial-grade PLC is adopted, which has powerful logic operation ability and data processing ability. The PLC realizes the control and monitoring of devices such as the sample injection pump, titration pump, solenoid valve, and sensor through programming, and automatically completes operations such as water sample collection, reagent addition, titration end point judgment, data collection and processing according to the preset program. At the same time, the PLC also has a fault diagnosis and alarm function. When a device fault or abnormal situation is detected, it can send out an alarm signal in time and take corresponding protection measures.

[0025] Human-machine interface (HMI): A color touch screen is adopted to provide a friendly human-machine interaction interface. The operator can input detection parameters, set the operation mode, view detection results and device status information, etc. through the HMI. The HMI also has a data storage and query function, which can store a large amount of detection data and device operation records, facilitating the operator to query historical data and conduct statistical analysis.

[0026] Electrical control cabinet: It is used to install electrical devices such as PLC, HMI, relays, and contactors, and provides power supply and electrical control for the entire analyzer. The electrical control cabinet adopts a sealed design and has good dust-proof, moisture-proof, and anti-corrosion performance, which can ensure the safe and reliable operation of electrical devices.

[0027] 4. Data processing system: The main function of the data processing system is to process and analyze the data collected by the detection system, calculate various water quality parameters of the circulating water, and generate a detection report. This system includes a computer, data processing software, and a printer.

[0028] Computer: Select a high-performance industrial computer with powerful data processing and storage capabilities. The computer is connected to the PLC through a communication interface, receives the data collected by the detection system in real time, and transmits the data to the data processing software for processing and analysis.

[0029] Data processing software: Adopt self-developed professional water quality analysis software with functions such as data processing, data analysis, data storage, and report generation. According to the principle of titrimetric analysis and the corresponding mathematical model, the data processing software processes and calculates the collected data to obtain various water quality parameters of the circulating water, such as hardness, alkalinity, chloride ion content, turbidity, etc. At the same time, the software can also perform statistical analysis on the detection data, draw the change curves and trend charts of water quality parameters, and provide a decision-making basis for the operation and management of the power plant circulating water system.

[0030] Printer: Used to print detection reports and data reports. The detection report includes content such as detection time, detection location, detection items, detection results, water quality evaluation, etc., and can intuitively reflect the water quality status of the circulating water.

[0031] Integrated design: The present invention integrates the detection functions of multiple water quality parameters in one analyzer, realizes the simultaneous detection of multiple water quality parameters of the power plant circulating water, avoids the cumbersome and inconvenient use of multiple single-parameter detection instruments, and greatly reduces the equipment cost and floor area.

[0032] High-precision detection: Adopt high-precision injection pumps, titration pumps and sensors, as well as advanced titration control technologies and data processing algorithms, which can accurately control the injection volume, reagent dropping volume and titration end point, and detect the physical and chemical changes of the water sample in real time and accurately, ensuring the accuracy and reliability of the detection results.

[0033] High degree of automation: Realize the automatic control and management of the analyzer through a programmable logic controller (PLC) and a human-machine interface (HMI). The operator only needs to input detection parameters and set the operation mode on the HMI, and the analyzer can automatically complete operations such as water sample collection, reagent dropping, titration end point judgment, data collection and processing, greatly reducing manual intervention and improving work efficiency and detection accuracy.

[0034] Real-time online monitoring: The analyzer can real-time online monitor the water quality changes of the power plant circulating water, timely detect water quality anomalies, and send out alarm signals, providing strong support for the timely adjustment and control of the power plant circulating water system, and helping to ensure the safe, stable and efficient operation of the power plant equipment.

[0035] Powerful data management and analysis functions: The data processing system has functions such as data storage, query, statistical analysis, and report generation, and can effectively manage and analyze a large amount of detection data, providing a decision-making basis for the operation management of the power plant circulating water system. At the same time, the detection report can be printed by a printer, which is convenient for operators to record and archive. Specific implementation methods

[0036] Selection of installation location: Select a dry, ventilated place away from heat sources and strong magnetic fields to install the analyzer, ensuring that there is enough space around the instrument for operation and maintenance. Fix the analyzer on the installation bracket to ensure the stability of the instrument.

[0037] Pipeline connection: Connect the sampling pipeline to the sampling port of the power plant circulating water pipeline, ensuring a firm connection and no leakage. Connect the titration pipeline to the reagent storage device and the reaction vessel, also ensuring a tight connection to prevent reagent leakage.

[0038] Electrical connection: Connect the power cord of the analyzer to a suitable power socket, ensuring a stable power supply voltage. Connect the signal lines of each sensor, actuator and other devices to the corresponding interfaces of the control system, and make correct wiring according to the electrical schematic diagram to avoid short circuits or open circuits.

[0039] Reagent preparation: Accurately prepare various titration reagents according to the requirements of the reagent instructions, and pour them into the corresponding reagent storage devices. Pay attention to the storage conditions of the reagents to avoid contamination and deterioration of the reagents.

[0040] Debugging process: Turn on the power supply, start the analyzer, and perform self-check. Check whether the working status of each system is normal, such as the operation of the sampling pump and titration pump, and whether the measured values of the sensors are accurate. Calibrate the analyzer, use standard water samples to calibrate each detection parameter, and adjust the zero point and range of the sensors to ensure the accuracy of the detection results.

[0041] Power-on preheating: Turn on the power switch of the analyzer and let the instrument preheat for 15 - 30 minutes to make each sensor and device reach a stable working state.

[0042] Parameter setting: Enter the parameter setting interface through the human-machine interface (HMI), and set parameters such as detection items, sampling volume, titration speed, and titration end judgment conditions according to the detection requirements. You can also select a preset detection mode for rapid detection.

[0043] Water sample collection and injection: Press the injection button, and the injection system starts to work. The water sample collection device collects water samples from the circulating water pipeline, and after filtration, the sampling pump transports the water samples to the reaction vessel. The sampling volume is precisely controlled by the flow control device to ensure that the sampling volume is the same each time.

[0044] Titrimetric analysis: After the injection is completed, the titration system automatically selects the corresponding titrant according to the set test items, and adds the reagent dropwise to the water sample in the reaction vessel through the titration pump. The detection system monitors the physical and chemical changes of the water sample during titration in real time, such as potential, pH value, temperature, etc., and converts these changes into electrical signals and transmits them to the control system.

[0045] Judgment of titration endpoint: When the detection system detects the titration endpoint, it transmits the signal to the control system. The control system immediately controls the titration pump to stop adding the reagent and records the consumption of the titrant. Different methods are used to judge the titration endpoint according to different test items. For example, the potentiometric titration method judges the endpoint according to the sudden change of the electrode potential, and the acid-base titration method judges the endpoint according to the sudden change of the pH value.

[0046] Data processing and result display: The data processing system receives the detection data transmitted from the control system, processes and calculates according to the preset mathematical model, and obtains various water quality parameters of the circulating water. The calculation results are displayed on the human-machine interface (HMI), and can also be stored in the database of the computer.

[0047] Generating a test report: The operator can select to generate a test report through the human-machine interface (HMI). The data processing software will automatically generate a test report containing the test time, test location, test items, test results, water quality evaluation, etc. according to the test results. The test report can be printed out by a printer or transmitted to a remote monitoring center through the network.

[0048] Example 1: Detection of the hardness of circulating water in a power plant.

[0049] Preparation of EDTA standard solution: Accurately weigh a certain amount of disodium ethylenediaminetetraacetate (EDTA), dissolve it with deionized water and make up to a certain volume to prepare an EDTA standard solution with a concentration of 0.01 mol / L.

[0050] Preparation of hardness indicator: Weigh an appropriate amount of Eriochrome Black T indicator, dissolve it with ethanol and prepare a solution with a certain concentration.

[0051] Collection of circulating water sample in a power plant: Use a water sample collection device to collect a water sample from the circulating water pipeline of the power plant and store it in a clean container.

[0052] Turn on and preheat: Turn on the power switch of the analyzer and let the instrument preheat for 20 minutes.

[0053] Parameter setting: Set the test item as hardness detection, the injection volume as 50 mL, and the titration speed as 0.5 mL / min through the human-machine interface (HMI).

[0054] Water sample injection: Press the injection button, and the injection system will deliver 50 mL of the water sample into the reaction vessel.

[0055] Add indicator: Add an appropriate amount of hardness indicator to the reaction vessel, and the solution turns purplish red.

[0056] Titration analysis: The titration system automatically selects the EDTA standard solution and delivers it dropwise into the water sample in the reaction vessel through the titration pump. The detection system monitors the color change and potential change of the solution in real time.

[0057] Judgment of titration end point: When the color of the solution changes from purplish red to blue and the potential undergoes a sudden change, the detection system determines that the titration end point is reached. The control system immediately controls the titration pump to stop adding the reagent and records the consumption of the titrant.

[0058] Data processing: The data processing system calculates the hardness value of the circulating water according to the consumption of the titrant and the concentration of the EDTA standard solution using the hardness calculation formula.

[0059] Result analysis: Compare the calculated hardness value with the hardness standard of the power plant circulating water to determine whether the water quality meets the requirements. If the hardness value exceeds the standard range, it indicates that there may be a risk of scaling in the circulating water, and corresponding treatment measures need to be taken, such as increasing the supplement amount of softened water, adjusting the dosing amount of the water quality stabilizer, etc.

[0060] Example 2: Detection of the alkalinity of power plant circulating water.

[0061] Prepare hydrochloric acid standard solution: Accurately weigh a certain amount of hydrochloric acid, dilute it with deionized water and make it up to a certain volume to prepare a hydrochloric acid standard solution with a concentration of 0.01 mol / L.

[0062] Prepare phenolphthalein indicator and methyl orange indicator: Weigh appropriate amounts of phenolphthalein and methyl orange respectively, dissolve them with ethanol and prepare solutions with a certain concentration.

[0063] Collect the water sample of power plant circulating water: The same as Example 1.

[0064] Startup preheating: The same as Example 1.

[0065] Parameter setting: Set the detection item as alkalinity detection, the injection volume as 50 mL, and the titration speed as 0.5 mL / min through the human-machine interface (HMI).

[0066] Water sample injection: Press the injection button, and the injection system will deliver 50 mL of the water sample into the reaction vessel.

[0067] Add indicator: Add a few drops of phenolphthalein indicator to the reaction vessel first, and the solution turns pink.

[0068] First titration: The titration system automatically selects the hydrochloric acid standard solution and adds it dropwise to the water sample in the reaction vessel through a titration pump. The detection system monitors the color change and pH value change of the solution in real time. When the color of the solution changes from pink to colorless and the pH value reaches a certain value, record the dosage of the first titrant.

[0069] Add methyl orange indicator: After the first titration, add a few drops of methyl orange indicator to the reaction vessel, and the solution turns yellow.

[0070] Second titration: Continue to add the hydrochloric acid standard solution to the reaction vessel. When the color of the solution changes from yellow to orange and the pH value changes again, record the dosage of the second titrant.

[0071] Data processing: The data processing system calculates the phenolphthalein alkalinity and total alkalinity of the circulating water based on the dosages of the first and second titrants respectively.

[0072] Result analysis: Compare the calculated phenolphthalein alkalinity and total alkalinity with the alkalinity standard of the power plant circulating water to determine whether the water quality meets the requirements. If the alkalinity is too high, it may cause equipment corrosion and scaling; if the alkalinity is too low, it may affect the buffering capacity of the circulating water. According to the analysis results, adjust the dosage of the water treatment agent to maintain the alkalinity of the circulating water within a suitable range.

[0073] Through the above specific implementation manners, the comprehensive circulating water analyzer based on the titration analysis method of the present invention can achieve accurate and efficient detection of various water quality parameters of the power plant circulating water, providing a strong guarantee for the safe and stable operation of the power plant circulating water system.

[0074] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A comprehensive circulating water analyzer based on titration analysis, characterized in that: It includes a sampling system, a titration system, a detection system, a control system and a data processing system; the sampling system is used to collect water samples from the circulating water pipeline of the power plant and transport them to the reaction container, including a water sample collection device, a sampling pipeline, a sampling pump and a flow control device; the titration system is used to add titration reagent to the water sample in the reaction container, including a reagent storage device, a titration pipeline, a titration pump and a titration control device; the detection system is used to monitor the physical and chemical changes of the water sample in the titration process in real time, including a potential sensor, a pH sensor, a temperature sensor and a turbidity sensor; the control system is used to coordinate the work of the sampling system, the titration system and the detection system, including a programmable logic controller (PLC), a human-machine interface (HMI) and an electrical control cabinet; the data processing system is used to process and analyze the data collected by the detection system, calculate the water quality parameters of the circulating water and generate a detection report, including a computer, data processing software and a printer.

2. The comprehensive circulating water analyzer based on titration analysis according to claim 1 is characterized in that: The water sample collection device adopts a multi-point sampling method, multiple sampling ports are set at different positions of the circulating water pipeline, and a filtering device is installed at the sampling port; the sampling pump is a high-precision peristaltic pump, and the flow control device adopts a closed-loop control system composed of a flow sensor and a regulating valve.

3. The comprehensive circulating water analyzer based on titration analysis according to claim 1 is characterized in that: The reagent storage device is composed of a plurality of independent reagent bottles, each of which is used to store a specific titration reagent and is equipped with a liquid level sensor; the titration pump is a high-precision injection pump, and the titration control device adopts a control system composed of a programmable logic controller (PLC) and a titration endpoint detection sensor.

4. The comprehensive circulating water analyzer based on titration analysis according to claim 1 is characterized in that: The potential sensor is used to detect changes in electrode potential in potentiometric titration, the pH sensor is used to detect changes in solution pH in acid-base titration, the temperature sensor is used to monitor the temperature of the water sample in the reaction container, and the turbidity sensor is used to detect the turbidity of the water sample.

5. The comprehensive circulating water analyzer based on titration analysis according to claim 1, characterized in that: The programmable logic controller (PLC) controls and monitors the sampling pump, titration pump, solenoid valve, sensor and other equipment through programming, and has fault diagnosis and alarm functions; the human-machine interface (HMI) is a color touch screen, which provides a friendly human-machine interaction interface and has data storage and query functions; the electrical control cabinet is used to install electrical equipment such as PLC, HMI, relays, contactors, etc., and adopts a sealed design.

6. The comprehensive circulating water analyzer based on titration analysis according to claim 1, characterized in that: The data processing software processes and calculates the collected data according to the principle of titration analysis and the corresponding mathematical model to obtain various water quality parameters of circulating water, and can perform statistical analysis on the test data and draw change curves and trend diagrams of water quality parameters; the printer is used to print test reports and data reports.

7. The comprehensive circulating water analyzer based on titration analysis according to claim 1, characterized in that: The sample injection pipeline and the titration pipeline are made of corrosion-resistant and high-pressure resistant materials, and the reaction container is made of corrosion-resistant and acid- and alkali-resistant materials.

8. The comprehensive circulating water analyzer based on titration analysis according to claim 1, characterized in that: The analyzer also includes a cleaning system for cleaning the sampling pipeline, the titration pipeline and the reaction container. The cleaning system includes a cleaning liquid storage device, a cleaning pipeline and a cleaning pump.