Intelligent cooperative control system and method for alkalinity and concentration ratio of circulating water system

Abstract

The invention discloses an intelligent cooperative control system and method for alkalinity and concentration ratio of a circulating water system, and belongs to the technical field of intelligent control in the field of water treatment. The system disclosed by the invention comprises a front pretreatment device, a water quality online instrument monitoring unit, a circulating water system water quantity prediction unit, a water quality stability regulation unit and a control unit, the water sample is connected with an inlet of the front pretreatment device through a circulating water pump; the water quality online instrument monitoring unit is connected with an outlet of the front pretreatment device; the water quality online instrument monitoring unit is connected with the control unit; the control unit is respectively connected with the water quality stability adjusting unit and the circulating water system water quantity prediction unit; the water quality stability adjusting unit is connected with the circulating water pump and the front pretreatment device through pipelines to form a circulating water system; a three-stage gradient filtering device is arranged in the front pretreatment device, and the technical problem that an existing monitoring system is difficult to effectively monitor the alkalinity and the concentration ratio at the same time is solved.

Description

Technical Field

[0001] The present invention belongs to the field of intelligent control technology in the field of water treatment, and specifically relates to an intelligent coordinated control system and method for alkalinity and concentration ratio of a circulating water system. Background Art

[0002] Circulating cooling water in thermal power plants is a major water consumer. Given the increasing scarcity of water resources, reducing water consumption by increasing and stabilizing the concentration ratio is crucial. Within thermal power plant circulating water systems, scaling and corrosion become increasingly severe as water evaporates from the cooling towers. This is especially true when carbonate hardness in the water precipitates due to supersaturation, leading to scaling. Currently, scaling and corrosion in circulating cooling water systems are primarily controlled by adding scale and corrosion inhibitors. However, when the concentration ratio needs to be further increased, reducing alkalinity by adding acid is a more cost-effective method.

[0003] The acidification of the circulating water system of a thermal power plant is usually done by adding sulfuric acid, which neutralizes the carbonate hardness in the water, reduces the alkalinity and pH of the circulating water, thereby slowing down the scaling trend and improving the concentration rate. However, the existing acidification treatment methods for circulating water systems mostly rely on manual sampling and testing of relevant parameters, and then estimate the amount of acid added, and manually adjust the amount of water replenishment and sewage discharge. Due to the large water volume of the circulating cooling water system of a thermal power plant, the system is complex and the unit load varies greatly, this method leads to a lag in the control effect and easily causes large fluctuations in the alkalinity and concentration rate, which not only wastes reagents but also poses a threat to the stable operation of the unit and brings hidden dangers to safe production. Therefore, it is necessary to conduct corresponding testing and timely adjustment of the alkalinity and concentration rate of the circulating water system to achieve an intelligent control level of online monitoring, precise control, telemetry and remote control of the circulating water system.

[0004] Chinese patent application publication number CN119414893A discloses a method for automatically controlling the acid addition of circulating cooling water. The method includes an online monitoring meter, monitoring and determining abnormalities in the online monitoring meter, controlling an acid addition pump based on the data, and performing corresponding logical judgments on abnormal data. While this invention has the advantage of designing multiple pH monitoring points and analyzing and determining the results to control the amount of acid addition, improving the operational reliability and stability of the system, this technical solution still has the following disadvantages:

[0005] 1) The operating concentration ratio of the cooling water system is not taken into consideration, and the concentration ratio of the circulating water system cannot be dynamically adjusted, resulting in waste of water resources and chemicals.

[0006] 2) The corresponding relationship between pH value and alkalinity fluctuates greatly, and the monitoring stability is poor. pH is easily affected by water temperature, flow rate, and ion interference (such as CO2 dissolution and salting-out effect), resulting in drift of the monitoring value. The alkalinity and pH in the carbonate buffer system have a nonlinear relationship, resulting in insufficient accuracy of single pH control.

[0007] 3) The sensor is easily affected by suspended matter pollution and flow rate fluctuations, resulting in inaccurate monitoring data and poor anti-interference ability. Summary of the Invention

[0008] The purpose of the present invention is to provide an intelligent coordinated control system and method for alkalinity and concentration ratio of a circulating water system, which is used to solve the technical problem that existing monitoring systems are difficult to effectively monitor alkalinity and concentration ratio at the same time.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions:

[0010] The present invention discloses an intelligent coordinated control system for alkalinity and concentration ratio of a circulating water system, comprising a pre-pretreatment device, an online water quality instrument monitoring unit, a circulating water system water quantity prediction unit, a water quality stabilization adjustment unit and a control unit; the water sampling is connected to the inlet of the pre-pretreatment device through a circulating water pump; the online water quality instrument monitoring unit is connected to the outlet of the pre-pretreatment device; the online water quality instrument monitoring unit is connected to the control unit; the control unit is respectively connected to the water quality stabilization adjustment unit and the circulating water system water quantity prediction unit; the water quality stabilization adjustment unit is connected to the circulating water pump and the pre-pretreatment device through pipelines to form a circulating water system;

[0011] A three-stage gradient filtering device is provided inside the pre-processing device.

[0012] Furthermore, the three-stage gradient filtration device includes a coarse filter layer, a medium filter layer and a fine filter layer which are sequentially arranged inside the pre-pretreatment device; differential pressure sensors are provided on the tank body between the inlet of the pre-pretreatment device and the coarse filter layer, between the coarse filter layer and the medium filter layer, and between the medium filter layer and the fine filter layer; a turbidity meter is provided at the inlet of the pre-pretreatment device.

[0013] Furthermore, a backwash high-pressure water pump and a backwash pipeline are provided on the outside of the pre-treatment device; one end of the backwash pipeline is connected to the backwash high-pressure water pump, and the other end is divided into three paths, which are respectively connected to the outside of the coarse filter layer, the medium filter layer and the fine filter layer.

[0014] Furthermore, the coarse filter layer is a stainless steel woven mesh with a pore size of 60-100 μm; the medium filter layer is activated carbon fiber cotton; and the fine filter layer is a silicon oxide ceramic membrane with a pore size of 0.5-1.0 μm.

[0015] Furthermore, the water quality stabilization adjustment unit includes a drain valve, a water supply valve, an alkali solution metering pump and an acid solution metering pump; the drain valve, water supply valve, alkali solution metering pump and acid solution metering pump are respectively connected to the control unit to achieve the concentration rate, system water volume and alkalinity stability in the circulating water system.

[0016] Furthermore, the water quality online instrument monitoring unit includes a pH sensor, an online alkalinity analyzer, a conductivity sensor, a potassium ion selective electrode and a turbidity sensor.

[0017] Furthermore, the circulating water system water volume prediction unit is provided with a calculation model for collecting and estimating the circulating water replenishment volume, sewage discharge volume and evaporated water volume.

[0018] The present invention also discloses a method for the intelligent coordinated control system of alkalinity and concentration ratio of the above-mentioned circulating water system, comprising the following steps:

[0019] The water sample is taken through the circulating water pump into the pre-pretreatment device for filtration, and then the filtered water is transported to the water quality online instrument monitoring unit for detection, and the detection signal is transmitted to the control unit for display; the circulating water system water volume prediction unit calculates the detection signal to obtain a predicted water replenishment trend data signal; the predicted water replenishment trend data signal is input into the control unit, and the control unit controls the water quality stabilization adjustment unit to control the water system stability of the circulating water system.

[0020] Furthermore, the flow rate of the filtered water delivered to the water quality online instrument monitoring unit is controlled at 0.6-2.0 L / min.

[0021] Furthermore, the water sampling enters the pre-treatment device through the circulating water pump with an inlet pressure range of 0.2-0.6 MPa;

[0022] When the pH of the circulating water system is less than 7.0, start the water quality stabilization adjustment unit to adjust the pH.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention discloses an intelligent collaborative control system for alkalinity and concentration ratio of a circulating water system. By setting a pre-pretreatment device, an online water quality instrument monitoring unit, a circulating water system water volume prediction unit, an alkalinity adjustment unit and a control unit, the pretreatment device can process the monitoring water sample, and can ensure the stability and accuracy of the water quality analysis of the subsequent monitoring device. The circulating water system water volume prediction unit can make a preliminary calculation of the system water replenishment volume and sewage discharge volume, and can provide more basis for the adjustment of the system alkalinity and concentration ratio, and prevent lag or excess when relying solely on water quality parameters for control; the three-stage gradient filtration device set inside the pretreatment device can process suspended matter, oil pollution and large particle impurities in the circulating water, and ensure the reliability of the subsequent monitoring data unit. Through multi-parameter fusion monitoring, dynamic water volume prediction and adaptive dosing strategy, accurate adjustment of alkalinity and stable control of concentration ratio are achieved, and the system's anti-interference ability to load changes and water quality disturbances is improved, solving the technical problem that the existing monitoring system is difficult to achieve effective monitoring of alkalinity and concentration ratio at the same time.

[0025] Furthermore, the three-stage gradient filtration device is provided with a backwash unit, which can automatically trigger high-pressure backwashing according to the pressure difference sensor signal to clear the filter layer blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural diagram of the intelligent coordinated control system for alkalinity and concentration ratio of the circulating water system of the present invention;

[0027] Figure 2 It is a structural schematic diagram of the three-stage gradient filtration device of the present invention;

[0028] Among them: 1-pre-treatment device; 2-water quality online instrument monitoring unit; 3-circulating water system water volume prediction unit; 4-control unit; 5-drain valve; 6-water supply valve; 7-alkali solution metering pump; 8-acid solution metering pump; 9-circulating water pump; 10-coarse filter layer; 11-medium filter layer; 12-fine filter layer; 13-pressure difference sensor; 14-backwash high-pressure water pump; 15-backwash pipeline. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0030] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0031] The present application discloses an intelligent collaborative control system for the alkalinity and concentration ratio of a circulating water system. The system is based on water volume prediction and achieves precise adjustment of alkalinity (error <±0.5mmol / L) and stable control of concentration ratio (fluctuation <±0.3 times) through multi-parameter fusion monitoring, dynamic water volume prediction and adaptive dosing strategy, and improves the system's resistance to load changes and water quality disturbances.

[0032] The present invention is described in further detail below with reference to the accompanying drawings:

[0033] See also Figure 1 As shown, the circulating water system alkalinity and concentration ratio intelligent coordinated control system disclosed in the present invention comprises a pre-treatment device 1, a water quality online instrument monitoring unit 2, a circulating water system water volume prediction unit 3, a water quality stabilization adjustment unit and a control unit 4;

[0034] The pre-treatment device is used to treat suspended solids, oil pollution and large particles in the circulating water to ensure the reliability of subsequent monitoring data units; Figure 2 As shown, a three-stage gradient filtration device is arranged inside, and the structure of the three-stage gradient filtration device is designed as a three-stage gradient filtration, including a coarse filter layer 10: a stainless steel woven mesh of 60-100um, which intercepts large-particle impurities; a medium filter layer 11: activated carbon fiber cotton, which absorbs grease and colloidal substances; a fine filter layer 12: a silicone ceramic membrane of 0.5-1.0um, which intercepts micron-sized particles; the setting of this structure can intercept impurities step by step, and automatically switch the filtration level according to the turbidity numerical data of the water sample; secondly, it is also connected to a backwash unit consisting of a backwash high-pressure water pump 14 and a backwash pipeline 15, which automatically triggers high-pressure backwashing according to the pressure difference sensor signal to clear the filter layer blockage. During backwashing, the water flows from bottom to top (opposite to the filtration direction) to improve the efficiency of blockage removal.

[0035] The water quality online instrument monitoring unit 2 is used to monitor the main water quality parameters of the circulating water online, integrate relevant monitoring instruments, monitor the water quality related parameters, and input the detection results into the control unit 4; it includes a pH sensor, an online alkalinity analyzer, a conductivity sensor, a potassium ion selective electrode and a turbidity sensor. The sampling pipeline is equipped with a constant flow system (flow rate 0.6L / min±5%) to avoid interference with the test by flow rate, bubbles and precipitation.

[0036] The water volume prediction unit 3 of the circulating water system is used to collect and estimate the circulating water replenishment volume, sewage discharge volume and evaporated water volume; collect the unit power generation load, ambient humidity, cooling tower inlet and outlet water temperature difference, circulating water pump flow and cooling tower liquid level in real time, and predict the future replenishment volume and sewage discharge volume trend through neural network fuzzy calculation; by collecting relevant parameters, make a preliminary prediction of the replenishment volume and sewage discharge volume, provide relevant information for water quality adjustment, avoid replenishment and blind adjustment, and input the results into the control unit 4.

[0037] The water quality stabilization adjustment unit includes a sewage valve 5 (used to control the system sewage discharge and stabilize the concentration ratio), a water replenishment valve 6 (used to control the system water replenishment and maintain the system water volume stable), an alkali solution metering pump 7 (used for emergency adjustment and control of alkalinity to prevent system corrosion caused by low alkalinity) and an acid solution metering pump 8 (used for alkalinity adjustment and control to maintain alkalinity within a reasonable range and maintain system stability).

[0038] The acid metering pump 8 adopts a variable frequency acid pump and is equipped with a pulse dosing module to prevent a sudden drop in local alkalinity. It is also designed with pH drop protection. When the pH of the circulating water at the monitoring point is less than 7.0, the acid addition is automatically cut off and the alkali metering pump 7 is started to add sodium hydroxide.

[0039] The control unit 4 is an intelligent control center, which performs comprehensive analysis and sewage discharge on the water quality analysis and water quantity prediction results, and controls the system as a whole by controlling the acid metering pump 8, the water supply valve 6 and the sewage valve 5.

[0040] Preferably, the coarse filter layer 10 intercepts large particle impurities such as suspended matter and algae, with a pressure drop of less than 5kPa; the medium filter layer 11 adsorbs grease, colloids and organic pollutants, reducing COD by 20-30%; the fine filter layer 12 finely intercepts micron-sized particles to ensure that the effluent turbidity is less than 1NTU.

[0041] Preferably, a pressure difference sensor 13 is provided on the tank body between the inlet of the pre-treatment device 1 and the coarse filter layer 10, between the coarse filter layer 10 and the medium filter layer 11, and between the medium filter layer 11 and the fine filter layer 12 to monitor the pressure difference between the two filter layers in real time and start backwashing when the threshold value (ΔP>15kPa) is triggered.

[0042] Preferably, the sewage valve 5 is an electric ball valve with an adjustable opening of 0-100%. Control: fully open during the backwash phase, closed during normal filtration, and the sewage is connected to the factory wastewater pool.

[0043] Preferably, a turbidity meter 17 is provided at the inlet of the pre-treatment device 1 for monitoring the turbidity of the incoming water before filtration, so as to provide support for system monitoring.

[0044] The present invention also discloses a method for using the above-mentioned circulating water system alkalinity and concentration ratio intelligent coordinated control system, comprising the following steps:

[0045] The circulating water sample or the supplementary water sample is filtered by the pre-pretreatment device 1 and then transported to the water quality online instrument detection unit 2 through a constant flow pump. The online instrument detection unit 2 integrates relevant online meters to measure the water samples simultaneously, and the results are transmitted to the control unit 4 in real time via protocol signals; the circulating water system water volume prediction unit 3 inputs relevant parameters through the model, predicts the water replenishment trend and transmits it to the control unit 4; the control unit 4 issues instructions to the water quality stabilization adjustment unit for acid addition control and emergency neutralization; and controls the water replenishment volume and sewage discharge volume of the circulating water system.

[0046] The control unit 4 is an intelligent control center, which is used to comprehensively calculate and judge the water quality and output control signals, and control the water replenishment and sewage discharge, including alkalinity composite control and dynamic regulation of concentration ratio; the alkalinity control in the water quality stabilization regulation unit is based on feedforward control: based on the water volume prediction result, the benchmark acid addition amount is calculated: V benchmark = Q prediction * (target alkalinity - water replenishment alkalinity) / 36, and the concentration ratio is dynamically regulated: the potassium ion ratio is selected as the concentration ratio reference to avoid chloride ion interference. When the concentration ratio is greater than the target value, the opening of the sewage valve 5 is adjusted according to the deviation ratio.

[0047] The water quality is stabilized by regulating the amount of water added, acid added and sewage discharged, and the circulating water pump outlet produces water for circulating water sample testing.

[0048] Example 1

[0049] A method for using an intelligent collaborative control system for alkalinity and concentration rate of a circulating water system, comprising the following steps:

[0050] Step 1: Parameter configuration

[0051] Start the pre-treatment device 1, the water quality online instrument monitoring unit 2 and the control system 4 to perform system self-test;

[0052] Set the target alkalinity range (e.g., 150-250 mg / L, calculated as CaCO3), the target concentration ratio (e.g., 3.0-5.0 times), and the safety threshold (pH ≥ 7.8); configure the pulse frequency of the acid metering pump 8 (e.g., 10-60 times / min) and the alkali solution dosage concentration of the alkali solution metering pump 7 (15%-20% NaOH solution); initialize the neural network model of the circulating water system water flow prediction unit 3, and input historical operating data (unit load, condenser circulating water temperature rise, ambient temperature and humidity, circulating water flow) for model calibration;

[0053] Step 2: Real-time collection and processing of water quality data

[0054] The supplementary water sample and the circulating water sample are filtered in turn by the pre-pretreatment device 1, and automatically switched to the spare filtration level in the pre-pretreatment device 1 according to the turbidity sensor feedback (threshold value > 10NTU) of the water quality online instrument monitoring unit 2, triggering backwashing (high-pressure water reverse flushing when the pressure difference is > 50kPa);

[0055] The constant flow pump delivers the clean water sample at a flow rate of 1.2 L / min ± 5% to the water quality online instrument monitoring unit 2, and simultaneously detects pH, alkalinity, conductivity, potassium ion concentration and turbidity, and uploads the data to the control unit 4;

[0056] Step 3: Water volume forecast and trend analysis

[0057] Real-time data collection of unit power generation load (MW), condenser inlet and outlet water temperature difference (ΔT = 3-12 ° C), ambient temperature (RH), ambient temperature, circulating water pump flow (Q = 5000-20000m 3 / h) and cooling tower liquid level (H = 2-5m);

[0058] The fuzzy neural network model calculates the amount of evaporated water (E = K × ΔT × Q × RH, where K is an empirical coefficient), the amount of sewage discharged (B), and the predicted replenishment amount (Q replenishment = E + B), and outputs a replenishment trend curve for the next hour. If the predicted replenishment amount fluctuates by more than ±15%, an early warning is triggered and the model parameters are recalibrated.

[0059] Step 4: Intelligent Alkalinity Control

[0060] Based on the predicted water replenishment amount Q, the baseline acid addition amount is calculated according to the formula:

[0061] Baseline = Qmakeup × (target alkalinity - make-up water alkalinity) 36;

[0062] The acid metering pump 8 is controlled to add sulfuric acid in a pulse mode (at intervals of 30 seconds). The online alkalinity measured value is compared with the target value every 5 minutes. When the deviation is greater than ±10%, the acid addition rate is dynamically adjusted according to the PID algorithm. When the pH sensor in the water quality online instrument monitoring unit 2 detects that the pH is less than 7.0 or the alkalinity is less than 80 mg / L, the acid metering pump 8 is immediately cut off and the alkaline metering pump 7 is started to add NaOH solution until the pH is greater than or equal to 7.5.

[0063] Step 5: Dynamic Control of Concentration Ratio

[0064] Potassium ion concentration ratio (circulating water K + / Hydration K + ) is used as the basis for calculating the concentration ratio (N), and the N value is updated every 10 minutes;

[0065] If N > target upper limit (e.g. 5.0 times), adjust the opening of the sewage valve 5 proportionally (Δ opening = K_p × (N-5.0)), and simultaneously link the water supply pump 6 to increase the water supply (ΔQ supply = 0.2 × Δ sewage discharge); if N exceeds the limit continuously for more than 30 minutes, start the enhanced sewage discharge mode (sewage valve 5 fully open for 60 seconds)

[0066] Step 6: Collaborative control and system closed-loop operation

[0067] Control unit 4 integrates alkalinity and concentration rate data, giving priority to ensuring alkalinity stability and then optimizing the discharge volume;

[0068] Complete a control report every hour, recording the amount of acid added, sewage discharge, water replenishment and key water quality parameters;

[0069] When water quality or equipment is abnormal (such as sensor failure, filter layer blockage alarm), switch to safety mode (fixed water replenishment + manual intervention);

[0070] Step 7: Coordinated control and system closed-loop operation

[0071] The pre-treatment device 1 automatically performs backwashing according to the cumulative operating time (every 24 hours) or the pressure difference signal. High-pressure water (0.5MPa) flushes the coarse, medium and fine filter layers in turn, and the sewage valve discharges slag for 5 minutes;

[0072] Online instruments are calibrated monthly.

[0073] The above content is only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. An intelligent coordinated control system for alkalinity and concentration ratio of a circulating water system, characterized in that: The invention comprises a pre-pretreatment device (1), an online water quality instrument monitoring unit (2), a circulating water system water quantity prediction unit (3), a water quality stabilization adjustment unit and a control unit (4); the water sampling is connected to the inlet of the pre-pretreatment device (1) through a circulating water pump (9); the online water quality instrument monitoring unit (2) is connected to the outlet of the pre-pretreatment device (1); the online water quality instrument monitoring unit (2) is connected to the control unit (4); the control unit (4) is respectively connected to the water quality stabilization adjustment unit and the circulating water system water quantity prediction unit (3); the water quality stabilization adjustment unit is connected to the circulating water pump (9) and the pre-pretreatment device (1) through a pipeline to form a circulating water system; A three-stage gradient filtering device is provided inside the pre-processing device (1).

2. The intelligent coordinated control system for alkalinity and concentration ratio of a circulating water system according to claim 1, characterized in that: The three-stage gradient filtration device comprises a coarse filter layer (10), a medium filter layer (11) and a fine filter layer (12) which are sequentially arranged at intervals inside a pre-pretreatment device (1); differential pressure sensors (13) are arranged on the tank body between the inlet of the pre-pretreatment device (1) and the coarse filter layer (10), between the coarse filter layer (10) and the medium filter layer (11), and between the medium filter layer (11) and the fine filter layer (12); and a turbidity meter (17) is arranged at the inlet of the pre-pretreatment device (1).

3. The intelligent coordinated control system for alkalinity and concentration ratio of a circulating water system according to claim 2, characterized in that: A backwash high-pressure water pump (14) and a backwash pipeline (15) are provided on the outside of the pre-treatment device (1); one end of the backwash pipeline (15) is connected to the backwash high-pressure water pump (14), and the other end is divided into three paths, which are respectively connected to the outside of the coarse filter layer (10), the medium filter layer (11) and the fine filter layer (12).

4. The intelligent coordinated control system for alkalinity and concentration ratio of a circulating water system according to claim 3, characterized in that: The coarse filter layer (10) is a stainless steel woven mesh with a pore size of 60-100 μm; the medium filter layer (11) is activated carbon fiber cotton; and the fine filter layer (12) is a silicon oxide ceramic membrane with a pore size of 0.5-1.0 μm.

5. The intelligent coordinated control system for alkalinity and concentration ratio of a circulating water system according to claim 1, characterized in that: The water quality stabilization regulating unit comprises a sewage discharge valve (5), a water supply valve (6), an alkali solution metering pump (7) and an acid solution metering pump (8); the sewage discharge valve (5), the water supply valve (6), the alkali solution metering pump (7) and the acid solution metering pump (8) are respectively connected to a control unit (4) and are used to achieve the stability of the concentration ratio, the system water volume and the alkalinity in the circulating water system.

6. The intelligent coordinated control system for alkalinity and concentration ratio of a circulating water system according to claim 1, characterized in that: The water quality online instrument monitoring unit (2) comprises a pH sensor, an online alkalinity analyzer, a conductivity sensor, a potassium ion selective electrode and a turbidity sensor.

7. The intelligent coordinated control system for alkalinity and concentration ratio of a circulating water system according to claim 1, characterized in that: The circulating water system water volume prediction unit (3) is provided with a calculation model for collecting and estimating the circulating water replenishment volume, sewage discharge volume and evaporated water volume.

8. The method for intelligent coordinated control of alkalinity and concentration ratio of a circulating water system according to any one of claims 1 to 7, characterized in that: The following steps are involved: Water sampling is passed through a circulating water pump (9) into a pre-treatment device (1) for filtration, and the filtered water is then transported to a water quality online instrument monitoring unit (2) for detection, and the detection signal is transported to a control unit (4) for display; a circulating water system water volume prediction unit (3) calculates the detection signal to obtain a predicted water replenishment trend data signal; the predicted water replenishment trend data signal is input into the control unit (4), and the control unit (4) controls the water quality stabilization adjustment unit to control the water system stability of the circulating water system.

9. The method for intelligent coordinated control of alkalinity and concentration ratio of circulating water system according to claim 8, characterized in that: The flow rate of the filtered water delivered to the water quality online instrument monitoring unit (2) is controlled at 0.6-2.0 L / min.

10. The method for intelligent coordinated control of alkalinity and concentration ratio of circulating water system according to claim 8, characterized in that: The water sampling enters the pre-treatment device (1) through the circulating water pump (9) with an inlet pressure range of 0.2-0.6 MPa; When the pH of the circulating water system is less than 7.0, start the water quality stabilization adjustment unit to adjust the pH.

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