Power plant circulating water intelligent dosing, water supplementing and pollution discharge method and device

Abstract

The application discloses a power plant circulating water intelligent dosing, water supplementing and pollution discharging method and device, and belongs to the field of circulating water treatment. The method comprises the following steps: measuring the pH value of circulating water, calculating the methyl orange alkalinity of the circulating water, then calculating the target value of the calcium hardness of the circulating water and the evaporation amount of the circulating water; and determining the dosing amount, the pollution discharging amount and the water supplementing amount according to the pH value of the circulating water, the calcium hardness of the circulating water and the evaporation amount of the circulating water. The device controls the automatic dosing system, the water supplementing system and the automatic pollution discharging system through a DCS online control system to complete precise dosing, water supplementing and pollution discharging. The application can improve the quality of circulating water, and the dosing, water supplementing and pollution discharging of the circulating water are accurate, the intelligent dosing, water supplementing and pollution discharging of the circulating water are realized, and the purposes of saving water and improving the quality of circulating water are achieved.

Description

Technical Field

[0001] This invention belongs to the field of circulating water treatment, and specifically relates to a method and apparatus for intelligent dosing, water replenishment and sewage discharge of circulating water in power plants. Background Technology

[0002] In power plants, the amount of chemicals added and makeup water used in the circulating water system accounts for over 70% of the total water consumption. Therefore, reducing the amount of chemicals added and makeup water used in the circulating water system has become a crucial task for power plants in reducing water consumption. Increasing the concentration ratio of the circulating water is a widely accepted and effective water-saving method. Increasing the concentration ratio can reduce makeup water consumption, conserve water resources, reduce wastewater discharge, reduce environmental pollution, save on water treatment chemicals, and lower cooling water treatment costs. Therefore, with the increasing scarcity of water resources and the significant rise in water resource fees and wastewater discharge fees, increasing the concentration ratio of the circulating water is an effective measure to save water, reduce operating costs, and improve economic efficiency.

[0003] Currently, most cooling tower blowdown systems in domestic thermal power plants are manually controlled. Chloride levels are typically measured using chemical analysis. When the circulating water concentration ratio exceeds the control value, operators are notified to open the cooling tower chemical dosing valve for chemical dosing, the makeup water valve for makeup water, or the blowdown valve for blowdown. Due to the long sampling and measurement cycle of manual methods and the lag in opening and closing the blowdown valve, the circulating water concentration ratio fluctuates greatly and cannot be stabilized at the expected value. The few systems that use automatic chemical dosing and makeup water control devices have low levels of intelligence, insufficient precision in chemical dosing control, and extremely complex configurations. Furthermore, they cannot achieve synchronous operation of the chemical dosing, makeup water, and blowdown devices with the circulating water system. Summary of the Invention

[0004] The technical problem this invention aims to solve is that the long cycle of manual sampling and measurement, and the lag in the opening and closing of the drain valve, lead to large fluctuations in the concentration ratio of circulating water, making it impossible to stabilize at the expected value. This invention aims to maximize the continuous and stable discharge, chemical dosing, and water replenishment of the cooling tower, effectively alleviating the problem of large fluctuations in the concentration ratio of circulating water caused by intermittent excessive discharge, chemical dosing, or water replenishment. It also allows the chemical dosing, water replenishment, and discharge devices to operate synchronously with the circulating water system.

[0005] This invention aims to provide a method and apparatus for intelligent dosing, water replenishment, and wastewater discharge of circulating water in power plants, the method comprising:

[0006] The main program is set using an intelligent controller and a DCS online control system, which controls the automatic dosing program, automatic water replenishment subroutine, automatic sewage discharge subroutine, and sampling subroutine to achieve precise control of the circulating water's dosing, water replenishment, and sewage discharge. The specific flow of the main program is as follows: Figure 2 As shown.

[0007] Samples were taken from the circulating water. Specifically, the sampling subroutine in the controller was used to detect the pH value, calcium hardness, liquid level, sewage flow rate, chemical dosing and water replenishment flow rate, outdoor control temperature, circulating water inlet temperature and circulating water outlet temperature of the cooling tower for AD sampling. Each parameter was sampled 20 times consecutively, and the average value of the 20 measurements was taken as the final measurement result.

[0008] The methyl orange alkalinity is calculated based on the pH value of the circulating water. Specifically, the methyl orange alkalinity of the circulating water is extrapolated from the pH value. Based on historical data of circulating water quality analysis, the following pattern is observed: when the pH value of the circulating water is 7.5–7.7, the methyl orange alkalinity is 100–110 mg / L. The calculation formula used in this method is: Methyl orange alkalinity = (pH - 5.5) × 50 mg / L.

[0009] The target value of calcium hardness and the evaporation rate of circulating water are calculated based on the methyl orange alkalinity. Specifically, the target value of calcium hardness = (1100 mg / L - methyl orange alkalinity - 50 mg / L); the evaporation rate of circulating water is calculated according to GB / T50050-2007, and the formula is as follows: evaporation rate of circulating water QZ = k × Δt × Qr, where Qr is the cooling capacity of circulating water (m3 / h), Δt is the temperature difference between the circulating water entering and leaving the cooling tower (°C), k is the temperature coefficient (1 / °C), and the value of k in different temperature ranges is shown in Table 1.

[0010] Table 1 Temperature coefficient k

[0011]

[0012] To simplify programming, based on the table above, the relationship between the k value and temperature t was fitted, resulting in the following formula for calculating the k value: k = 0.001 + 0.00002 × t;

[0013] The dosing control subroutine is used to control the target pH value of the circulating water at 7.6. Specifically, based on the feedback of the circulating water pH, the opening of the dosing regulating valve is adjusted through the PID control program, that is, the pH value of the circulating water is adjusted by controlling the amount of added chemical.

[0014] The wastewater discharge control subroutine is used to regulate the wastewater discharge volume of circulating water. Specifically, when wastewater discharge is required, the wastewater discharge control subroutine first determines whether the measured calcium hardness value is greater than the set value. If the measured calcium hardness value is greater than the set value, the wastewater discharge regulating valve is opened to its maximum value and the program returns to the main program. If the measured calcium hardness value is less than the set value, the subroutine further determines whether the measured calcium hardness value plus 30 mg / L is greater than the set value. If the measured calcium hardness value plus 30 mg / L is greater than the set value, the wastewater discharge volume setting is set to evaporation rate × fresh water calcium hardness ÷ circulating water calcium hardness. The PID controller is then used to adjust the wastewater discharge regulating valve opening and the program returns to the main program. If the measured calcium hardness value plus 30 mg / L is less than the set value, the wastewater discharge regulating valve opening is controlled to its minimum limit and the program returns to the main program.

[0015] The water replenishment control subroutine is used to adjust the amount of water replenished into the circulating water system. Specifically, when water replenishment is required, the subroutine first determines whether the circulating water level is high. If the level is high, it closes the water replenishment regulating valve and returns to the main program. If the level is low, it continues to determine whether the level is low. If the level is low, it adjusts the water replenishment regulating valve to its maximum opening and returns to the main program. If the level is not low, the required water replenishment is the sum of the evaporation and sewage discharge. Then, the PID controller adjusts the opening of the sewage discharge regulating valve and returns to the main program.

[0016] After the sewage discharge, chemical dosing, and water replenishment are completed, the process returns to the sampling subroutine to perform sampling. If the conditions for sewage discharge, chemical dosing, and water replenishment are met again, the process is repeated to achieve automatic detection.

[0017] The aforementioned method for intelligent dosing, replenishment, and discharge of circulating water in power plants can accurately detect data in the circulating water and calculate the target values ​​for methyl orange alkalinity, circulating water hardness, and circulating water evaporation. Based on the target values ​​for methyl orange alkalinity, circulating water hardness, and circulating water evaporation, the method enters a subroutine to precisely control the opening of the discharge and replenishment valves and determine the replenishment amount. This improves the quality of the circulating water and achieves intelligent control of dosing, replenishment, and discharge, thereby saving water and improving the quality of the circulating water. It also has the function of real-time remote monitoring and operation via DCS, enabling remote IoT-based management of multiple sets of automatic dosing, replenishment, and discharge devices.

[0018] The device includes: an intelligent controller, an automatic dosing system, an automatic water replenishment system, an automatic sewage discharge system, an electric regulating gate for circulating water dosing, an electric regulating gate for circulating water dosing, an electric regulating gate for water replenishment, an electric regulating gate for circulating water sewage discharge, an intelligent controller, a comprehensive circulating water quality analyzer, a circulating water replenishment flow meter, a circulating water sewage discharge flow meter, a circulating water level gauge, and three thermometers.

[0019] Specifically, the DCS online control system connects and controls the automatic dosing system, automatic water replenishment system, and automatic sewage discharge system to the DCS online control system.

[0020] The control logic of the intelligent controller is as follows: Figure 2 As shown.

[0021] The automatic sewage discharge system is preferably a flow-controlled sewage discharge system, consisting of a circulating water quality comprehensive analyzer, a cooling tower level gauge, a flow meter, and a sewage discharge regulating valve, for automatic sewage discharge. The automatic sewage discharge system detects and determines the calcium hardness value in the circulating water based on the logic control in the automatic sewage discharge subroutine, and then controls the opening of the sewage discharge regulating valve according to the controller to accurately determine the amount of sewage discharged in the circulating loop.

[0022] The automatic dosing and water replenishment system is preferably a flow-controlled dosing and water replenishment system, consisting of a circulating water quality comprehensive analyzer, a cooling tower level gauge, a flow meter, and dosing and water replenishment regulating valves, for automatic dosing and water replenishment. The automatic dosing and water replenishment system detects and determines the circulating water level based on the automatic dosing and water replenishment subroutine, precisely adjusting the dosing and water replenishment amounts.

[0023] Because the device is equipped with an interlock switch for the cooling tower circulating water inlet pressure, when the circulating water system starts running, the automatic chemical dosing, water replenishment, and sewage discharge systems also start operating; when the circulating water system stops running, the automatic chemical dosing, water replenishment, and sewage discharge systems also stop operating. Therefore, problems such as excessive or insufficient chemical dosing, water replenishment, and sewage discharge will not occur.

[0024] Furthermore, the interlocking switch is an electrical linkage device including a pressure relay, the intelligent controller is connected to the pressure relay, and the pressure relay is connected to the main power supply of the device.

[0025] The online corrosion rate detector is connected to the circulating water pipeline of the cooling tower and is used to detect the corrosion of the pipeline by the circulating water quality.

[0026] This device can also be widely used in fields such as power, petroleum, metallurgy, chemical industry, environmental engineering, high, medium and low pressure boilers, etc., where the quality of circulating water needs to be controlled by replenishing water and adding chemicals.

[0027] The aforementioned intelligent dosing, water replenishment, and sewage discharge device for power plant circulating water mainly employs an intelligent controller and a DCS system to precisely control the subroutines of each part of the dosing, water replenishment, and sewage discharge process. This design enables the intelligent dosing, water replenishment, and sewage discharge device for power plant circulating water to effectively control the circulating water concentration ratio, maximizing the continuous and stable sewage discharge, dosing, and water replenishment of the cooling tower. It effectively alleviates the problem of large fluctuations in the circulating water concentration ratio caused by intermittent excessive sewage discharge or dosing and water replenishment. Furthermore, it features real-time remote monitoring and operation via DCS, enabling remote IoT-based management of multiple automatic dosing, water replenishment, and sewage discharge devices, allowing them to operate synchronously with the circulating water system. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 The present invention provides a structural diagram of an intelligent dosing, water replenishment, and sewage discharge device for power plant circulating water.

[0030] Figure 2 The present invention illustrates the logic control of an intelligent controller automatic device for a power plant circulating water intelligent dosing, water replenishment and sewage discharge device;

[0031] Figure 3 This invention illustrates an automatic sewage discharge subroutine of an intelligent method and apparatus for dosing, replenishing, and discharging circulating water in a power plant.

[0032] Figure 4 The present invention illustrates an automatic water replenishment subroutine of a method and apparatus for intelligent dosing, water replenishment and sewage discharge of circulating water in power plants. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0035] Example 1:

[0036] A method for intelligent dosing, water replenishment, and wastewater discharge of circulating water in power plants, such as... Figure 1 As shown:

[0037] Step S101: Initialize the various system subroutines using the intelligent controller.

[0038] Step S102 involves taking circulating water samples based on the sampling subroutine. Specifically, the sampling subroutine in the controller detects the circulating water pH value, circulating water calcium hardness, circulating water level, sewage discharge flow rate, chemical dosing and water replenishment flow rate, outdoor control temperature, circulating water inlet temperature and circulating water outlet temperature for AD sampling. Each parameter is sampled 20 times consecutively, and the average value of the 20 measurements is taken as the final measurement result.

[0039] Step S103 calculates the methyl orange alkalinity based on the pH value of the circulating water. Specifically, the methyl orange alkalinity of the circulating water is estimated using the pH value. Based on historical data from circulating water quality analysis, the following pattern is observed: when the pH value of the circulating water is 7.5–7.7, the methyl orange alkalinity is 100–110 mg / L. The calculation formula used in this method is: Methyl orange alkalinity = (pH - 5.5) × 50 mg / L.

[0040] Step S104 calculates the target value of calcium hardness in circulating water based on the methyl orange alkalinity. Specifically, the target value of calcium hardness = (1100 mg / L - methyl orange alkalinity - 50 mg / L).

[0041] Step S105 calculates the circulating water evaporation rate according to the provisions of GB / T50050-2007. The calculation formula is as follows: Circulating water evaporation rate QZ=k×Δt×Qr, where Qr is the circulating water cooling rate (m3 / h), Δt is the temperature difference between the circulating water entering and leaving the cooling tower (°C), and k is the temperature coefficient (1 / °C). The values ​​of k in different temperature ranges are shown in Table 1.

[0042] Table 1 Temperature coefficient k

[0043]

[0044] To simplify programming, based on the table above, the relationship between k and temperature t was fitted, resulting in the following formula for calculating k: k = 0.001 + 0.00002 × t

[0045] Step S106, the dosing control subroutine, is used to control the target value of the circulating water pH at 7.6. Specifically, based on the feedback of the circulating water pH, the opening of the dosing regulating valve is adjusted through the PID control program, and the pH value of the circulating water is adjusted by controlling the amount of added drug.

[0046] Step S107 adjusts the circulating water discharge rate according to the sewage control subroutine. For example... Figure 3 As shown, when sewage discharge is required, the sewage discharge control subroutine first determines whether the calcium hardness measurement value is greater than the set value. If the calcium hardness measurement value is greater than the set value, the sewage discharge regulating valve opening is controlled to the maximum value and the program returns to the main program. If the calcium hardness measurement value is less than the set value, the subroutine further determines whether the calcium hardness measurement value plus 30 mg / L is greater than the set value. If the calcium hardness measurement value plus 30 mg / L is greater than the set value, the sewage discharge setting value is set to evaporation rate × fresh water calcium hardness ÷ circulating water calcium hardness, and the PID controller is used to adjust the sewage discharge regulating valve opening and the program returns to the main program. If the calcium hardness measurement value plus 30 mg / L is less than the set value, the sewage discharge regulating valve opening is controlled to the minimum limit value and the program returns to the main program.

[0047] Step S108 uses the water replenishment control subroutine to adjust the amount of water replenished into the circulating water system. For example... Figure 4 As shown, when water replenishment is required, the water replenishment control subroutine first determines whether the circulating water level is high. If the circulating water level is high, the water replenishment regulating valve is closed and the program returns to the main program. If the circulating water level is not high, the subroutine continues to determine whether the circulating water level is low. If the circulating water level is low, the water replenishment regulating valve is adjusted to its maximum opening and the program returns to the main program. If the circulating water level is not low, the required water replenishment amount is the sum of the evaporation amount and the sewage discharge amount. The PID controller is then used to adjust the opening of the sewage discharge regulating valve and the program returns to the main program.

[0048] After completing the above steps, return to the sampling subroutine to continuously monitor the environment of the circulating water. When the conditions for the next sewage discharge, chemical addition, and water replenishment are met, repeat the above steps.

[0049] The method described above for intelligent dosing, water replenishment, and sewage discharge of circulating water in a power plant accurately detects data in the circulating water and calculates the target values ​​for methyl orange alkalinity, circulating water hardness, and circulating water evaporation. Based on the target values ​​for methyl orange alkalinity, circulating water hardness, and circulating water evaporation, the method enters a subroutine to precisely control the opening of the sewage discharge regulating valve and the water replenishment regulating valve, accurately determine the amount of water replenishment, improve the quality of circulating water, and achieve intelligent control of intelligent dosing, water replenishment, and sewage discharge of circulating water, thereby achieving the purpose of water conservation and improving the quality of circulating water.

[0050] A smart device for chemical dosing, water replenishment, and sewage discharge of circulating water in a power plant, such as Figure 1As shown, it includes an intelligent controller 1, a DCS system 2, an I / O interface 3, a sewage discharge regulating valve 4, a chemical dosing regulating valve 5, a water replenishment regulating valve 6, a chemical dosing pipeline 7, a sewage discharge pipeline 8, a circulating water inlet pipeline 9, a circulating water outlet pipeline 10, a circulating water quality comprehensive analyzer 11, a circulating water sewage discharge flow meter 12, a circulating water replenishment flow meter 13, an inlet water thermometer 14, an outlet water thermometer 15, an air thermometer 16, and an online corrosion rate detector 17.

[0051] The DCS online control system connects the automatic dosing and water replenishment system and the automatic sewage discharge system to the DCS online control system, and is controlled by the DCS online control system.

[0052] The automatic sewage discharge system is preferably a flow-controlled sewage discharge system, consisting of a circulating water quality comprehensive analyzer, a cooling tower level gauge, a flow meter, and a sewage discharge regulating valve, for automatic sewage discharge. The automatic sewage discharge system detects and determines the calcium hardness value in the circulating water based on the logic control in the automatic sewage discharge subroutine, and then controls the opening of the sewage discharge regulating valve according to the controller to accurately determine the amount of sewage discharged in the circulating loop.

[0053] The automatic dosing and water replenishment system is preferably a flow-controlled dosing and water replenishment system, consisting of a circulating water quality comprehensive analyzer, a cooling tower level gauge, a flow meter, and dosing and water replenishment regulating valves, for automatic dosing and water replenishment. The automatic dosing and water replenishment system detects and determines the circulating water level based on the automatic dosing and water replenishment subroutine, precisely adjusting the dosing and water replenishment amounts.

[0054] Because the device is equipped with an interlock switch for the cooling tower circulating water inlet pressure, when the circulating water system starts running, the automatic chemical dosing, water replenishment, and sewage discharge systems also start operating; when the circulating water system stops running, the automatic chemical dosing, water replenishment, and sewage discharge systems also stop operating. Therefore, problems such as excessive or insufficient chemical dosing, water replenishment, and sewage discharge will not occur.

[0055] Furthermore, the interlocking switch is an electrical linkage device including a pressure relay, the intelligent controller is connected to the pressure relay, and the pressure relay is connected to the main power supply of the device.

[0056] The online corrosion rate detector is connected to the circulating water pipeline of the cooling tower and is used to detect the corrosion of the pipeline by the circulating water quality.

[0057] Based on the online control of the DCS system, real-time remote monitoring and operation of the DCS can be achieved, enabling remote IoT-based management of multiple automatic dosing, water replenishment, and sewage discharge devices. Through the intelligent controller's PID self-tuning parameter program, the pH value of the circulating water can be stably adjusted, remaining stable between 7.5 and 7.7, and the "calcium hardness + methyl orange alkalinity (as CaCO3)" of the circulating water can be stably maintained between 1000 mg / L and 1100 mg / L. Approximately 4000 m³ of fresh water can be saved each month, achieving water conservation and precise control of circulating water quality.

Claims

1. A method for intelligent dosing, water replenishment, and wastewater discharge of circulating water in a power plant, characterized in that, Applied to the field of circulating water treatment, the method includes: (1) The pH value of the circulating water was measured by sampling, and the methyl orange alkalinity of the circulating water was calculated based on the pH value of the circulating water. (2) Calculate the target value of calcium hardness in circulating water based on the value of methyl orange alkalinity; (3) Calculate the evaporation rate of circulating water based on the calcium hardness value of circulating water; (4) Determine the dosage based on the pH value of the circulating water; (5) When sewage discharge is required, determine whether the calcium hardness measurement value is greater than the set value. If it is greater than the set value, control the opening of the sewage discharge regulating valve to the maximum value. If it is less than the set value, determine whether the calcium hardness measurement value plus 30mg / L is greater than the set value. If the calcium hardness measurement value plus 30mg / L is greater than the set value, then set the sewage discharge volume to the evaporation rate × fresh water calcium hardness ÷ circulating water calcium hardness. If the calcium hardness measurement value plus 30mg / L is less than the set value, then control the opening of the sewage discharge regulating valve to the minimum limit value. (6) The amount of water replenishment is determined based on the level of the circulating water, the amount of evaporation of the circulating water and the amount of sewage discharge; wherein, the amount of water replenishment is determined by first determining whether the level of the circulating water is high. If the level of the circulating water is lower than the high level state but higher than the low level state, the required amount of water replenishment is the sum of the amount of evaporation and the amount of sewage discharge.

2. The intelligent dosing, replenishment, and discharge method for power plant circulating water as described in claim 1, wherein, The dosage of the chemical is adjusted based on the pH value of the circulating water to precisely control the pH value of the circulating water at 7.

6.

3. The intelligent dosing, replenishment, and discharge method for power plant circulating water as described in claim 1, wherein, If the circulating water level is high, water replenishment is suspended; if the circulating water level is low, the water replenishment is controlled to flow in as quickly as possible.

4. A smart dosing, water replenishment, and sewage discharge device for power plant circulating water, wherein, The device uses the intelligent dosing, water replenishment, and sewage discharge method for power plant circulating water as described in any one of claims 1 to 3. The device includes: an automatic dosing system, a water replenishment system, and an automatic sewage discharge system. The automatic dosing system, water replenishment system, and automatic sewage discharge system are connected to and controlled by a DCS online control system. An intelligent controller is connected to the DCS online control system. The automatic sewage discharge system and the automatic water replenishment system are connected to a cooling tower. The automatic dosing system is connected to the automatic water replenishment system. A comprehensive circulating water quality analyzer is placed in the cooling tower and is connected to the sewage discharge pipe, the water replenishment pipe, and the circulating water outlet pipe, respectively. The automatic sewage discharge system includes a circulating water sewage discharge regulating valve, a circulating water sewage discharge flow meter, and sewage discharge pipes; The intelligent controller controls the circulating water sewage discharge regulating valve to automatically discharge sewage. The sewage discharge regulating valve is placed in the sewage discharge pipe, which is connected to the circulating water cooling tower. The circulating water sewage discharge flow meter is placed in front of the sewage discharge regulating valve and is used to measure the amount of sewage discharged from the circulating water. The dosing system and water replenishment system include an intelligent controller, dosing pipeline, water replenishment pipeline, circulating water replenishment flow meter, circulating water cooling tower level gauge and circulating water inlet and outlet temperature meter; The intelligent controller controls the circulating water dosing regulating valve and the water replenishment regulating valve to automatically add chemicals and replenish water, respectively. The dosing regulating valve is placed on the dosing pipeline, and the water replenishment regulating valve is placed on the water replenishment pipeline. The circulating water replenishment flow meter is placed after the water replenishment regulating valve to measure the water replenishment flow.

5. The intelligent dosing, water replenishment, and sewage discharge device for power plant circulating water according to claim 4, wherein, The intelligent controller communicates with the DCS via an RS485 interface and receives control commands from the DCS. The intelligent controller measures parameters such as water quality, water level, and water temperature of the circulating water. Based on these parameters, an intelligent algorithm is used to intelligently control the regulating valves for chemical dosing, water replenishment, and sewage discharge of the circulating water. The intelligent controller intelligently determines the operating status of the circulating water system based on the interlock switch with the cooling tower circulating water inlet pressure.

6. The intelligent dosing, water replenishment, and sewage discharge device for power plant circulating water according to claim 4, wherein, The circulating water quality comprehensive analyzer includes: an online calcium hardness analyzer for circulating water, an online calcium hardness analyzer for chemical dosing and water replenishment, and an online pH meter for circulating water.

7. The intelligent dosing, water replenishment and sewage discharge device for power plant circulating water according to claim 4 further includes a thermometer composed of three temperature measuring resistors PT100, which are respectively placed at the inlet of the circulating water inlet pipe, the outlet of the circulating water outlet pipe and the corresponding working environment to measure the circulating water inlet temperature, the circulating water outlet temperature and the ambient temperature respectively.

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