Closed water system corrosion rate online monitoring and corrosion inhibitor intelligent dosing system

Abstract

The present application relates to the technical field of water treatment, and discloses a closed water system corrosion rate online monitoring and intelligent corrosion inhibitor dosing system, which comprises a main circulating pipe network, a main circulating pump, a sensing and collecting unit, a dosing execution unit and a control and operation unit. The sensing and collecting unit detects and transmits the real-time mass concentration of inert tracers and active corrosion inhibitors; the control and operation unit performs difference calculation to obtain a global pure chemical consumption rate; when the time first-order derivative of the global pure chemical consumption rate is greater than a positive step threshold value, an alternating fluctuation component is extracted to perform cross-correlation analysis to obtain a time offset, and a fluid one-way transmission physical distance is obtained in combination with the time offset and a fluid average flow rate; a target time node is predicted according to the fluid one-way transmission physical distance, a feedforward pulse control instruction is sent to the dosing execution unit to drive the dosing execution unit to inject pure active corrosion inhibitors into the main circulating pipe network at the target time node.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, specifically to an online monitoring system for corrosion rate in closed water systems and an intelligent dosing system for corrosion inhibitors. Background Technology

[0002] Closed-loop water systems experience pipe corrosion during operation, requiring the addition of chemicals to the main circulation network for corrosion prevention. Existing monitoring systems largely rely on a single chemical concentration indicator to assess corrosion status. However, due to physical leakage and subsequent water replenishment during continuous operation, the chemical concentration in closed-loop water systems tends to decrease. Conventional monitoring techniques cannot distinguish between the loss caused by physical leakage and the purely chemical consumption resulting from the reaction of the chemical with the pipe walls, thus failing to obtain the true rate of pure corrosion consumption and objectively determine the overall corrosion status of the pipe network.

[0003] Existing technologies have limitations in addressing severe localized corrosion events within pipeline networks. Conventional monitoring methods can only detect a decrease in the total amount of reagent, making it difficult to pinpoint the location in physical space. Due to the lack of methods for extracting and analyzing concentration fluctuation components, existing technologies cannot construct spatial mapping mechanisms to find the maximum time offset. When localized corrosion occurs, conventional systems cannot calculate the unidirectional transmission distance of the localized corrosion area within the main circulation network by combining the average fluid velocity, resulting in an inability to determine the specific location of pipeline deterioration.

[0004] For existing localized corrosion, current chemical dosing systems generally employ a continuous, uniform dosing method. The injected corrosion repair agent is diluted by the large volume of water in the pipe network, and the diluted agent concentration often falls short of the concentration required for rapid repair, resulting in poor corrosion protection and wasted agent. Existing control systems cannot calculate the target mass of repair agent consumed in the localized corrosion area through integral calculations, nor can they estimate the time point when the agent peak reaches the localized corrosion area based on the transmission distance. Conventional systems cannot predict the target time point and inject the agent in a single targeted manner, failing to achieve feedforward targeted pulse injection of corrosion repair agents. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an online monitoring system for corrosion rate in closed water systems and an intelligent dosing system for corrosion inhibitors. This system solves the problems of existing conventional monitoring technologies being unable to distinguish between physical losses and purely chemical consumption, unable to physically locate localized corrosion areas, and unable to predict target time points for targeted agent injection.

[0006] To achieve the above objectives, the present invention provides the following technical solution: This invention provides an online monitoring system for corrosion rate in a closed-loop water system and an intelligent corrosion inhibitor dosing system, comprising a main circulation pump, a sensor acquisition unit, a dosing execution unit, and a control and calculation unit. The main circulation pump is arranged in the main circulation pipeline to drive fluid circulation; the sensor acquisition unit transmits the real-time mass concentration of the inert tracer and active corrosion inhibitor to the control and calculation unit; the dosing execution unit is connected to the main circulation pipeline to receive control commands and inject the agent; the control and calculation unit is communicatively connected to the sensor acquisition unit and the dosing execution unit.

[0007] The control and computation unit contains a control program, which is divided into a fluid spatiotemporal baseline calibration module, a global pure chemical consumption rate dynamic decoupling module, a local corrosion spatial mapping module, and a phase-shift targeted pulse feedforward dosing control module. During the initial commissioning phase of the system, the control and computation unit calculates the quotient of the fixed total water volume of the closed water system and the rated volumetric flow rate of the main circulation pump. The quotient is output as the basic fluid circulation cycle, and the waveform data sequence of the real-time mass concentration of the inert tracer changing over time is extracted and stored as the physical transmission time-domain reference function.

[0008] During continuous operation, the control unit extracts the first derivative of the real-time mass concentration of the inert tracer and the active corrosion inhibitor in the time domain, respectively. By dividing the negative value of the first derivative by the corresponding real-time mass concentration, the normalized decay rate of the inert tracer and the active corrosion inhibitor are calculated, respectively. The difference in the proportion of pure chemical consumption is obtained by subtracting the normalized decay rate of the inert tracer from the normalized decay rate of the active corrosion inhibitor. The physical loss is then removed using this difference. Finally, the difference in the proportion of pure chemical consumption is multiplied by the real-time mass concentration of the active corrosion inhibitor and the fixed total water volume to obtain the global pure chemical consumption rate.

[0009] When the time-order first derivative of the global pure chemical consumption rate exceeds the positive step threshold, a pipeline corrosion event is determined to have occurred, and a corrosion repair trigger command is generated. Upon receiving the corrosion repair trigger command, a data capture time window is constructed using the fluid circulation cycle. The continuous real-time mass concentration values ​​within the data capture time window are extracted and mathematically integrated to obtain the average concentration. By subtracting the average concentration from the real-time mass concentration for de-meaning processing, the AC fluctuation components of the inert tracer and the active corrosion inhibitor are extracted respectively.

[0010] Within the time span of the basic fluid circulation cycle, a time-delay independent variable is introduced. The AC fluctuation component of the inert tracer is multiplied by the AC fluctuation component of the active corrosion inhibitor after the introduction of the time-delay independent variable, and a definite integral is performed to construct a cross-correlation function. By continuously changing the value of the time-delay independent variable, the maximum time offset corresponding to the maximum value of the cross-correlation function is found. The maximum time offset is multiplied by the average fluid velocity to obtain the physical distance of unidirectional fluid transmission in the local corrosion area.

[0011] The start time is set when the first derivative of time exceeds the positive step threshold, and the end time is set when the current calculation time is set. Within the set time interval, a mathematical integral is performed on the global pure chemical consumption rate to calculate the target mass of active corrosion inhibitor consumed in the localized corrosion zone within the main circulation network. The time offset parameter of the localized corrosion zone is obtained by dividing the unidirectional fluid transport distance by the average fluid velocity. The target time node for the next fluid peak to reach the localized corrosion zone is predicted by adding the current system standard time to the basic fluid circulation cycle and subtracting the time offset parameter. When the system standard time reaches the target time node, a feedforward pulse control command is sent to the dosing execution unit, driving it to inject pure active corrosion inhibitor, matching the target mass value, into the main circulation network in a single targeted injection.

[0012] This invention provides an online monitoring system for corrosion rate in closed-loop water systems and an intelligent system for adding corrosion inhibitors. It offers the following advantages: 1. This invention calculates the normalized decay rate by extracting the real-time mass concentrations of inert tracers and active corrosion inhibitors. The difference in the proportion of purely chemical consumption is obtained by subtracting the normalized decay rate of the inert tracer from the normalized decay rate of the active corrosion inhibitor. This difference in the proportion of purely chemical consumption is then used to separate physical losses, resulting in the global purely chemical consumption rate. This solves the problem that traditional monitoring methods cannot distinguish between pipeline leakage and chemical consumption of corrosion inhibitors, thus achieving online monitoring of the pure corrosion consumption rate.

[0013] 2. This invention extracts the AC fluctuation components of inert tracers and active corrosion inhibitors when the time-first derivative of the global pure chemical consumption rate exceeds the positive step threshold, and constructs a cross-correlation function. It then identifies the maximum time offset corresponding to the maximum value of the cross-correlation function. Multiplying the maximum time offset by the average fluid velocity yields the physical distance of unidirectional fluid transport. Combining this with the basic fluid circulation cycle, the physical spatial location of the localized corrosion zone within the main circulation network is completed.

[0014] 3. This invention calculates the target mass of active corrosion inhibitor consumed in the localized corrosion area by mathematical integration of the global pure chemical consumption rate. It then uses the physical distance of unidirectional fluid transport to derive the time offset parameter, predicting the target time node for the fluid peak to reach the localized corrosion area. At the target time node, a single targeted injection of pure active corrosion inhibitor, matching the target mass value, into the main circulation network avoids the dilution caused by large volumes of water in conventional continuous dosing, thus achieving feedforward targeted pulse injection of the corrosion repair agent. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an online monitoring system for corrosion rate and an intelligent dosing system for corrosion inhibitors in a closed water system according to the present invention. Figure 2 This is a connection diagram of the control module of an online corrosion rate monitoring and intelligent corrosion inhibitor dosing system for a closed water system according to the present invention. Figure 3 This is a flowchart illustrating the overall control steps of an online monitoring system for corrosion rate in a closed-loop water system and an intelligent dosing system for corrosion inhibitors, as described in this invention. Figure 4 This is a dynamic monitoring curve of global pure chemical consumption rate in an embodiment of the present invention; Figure 5 This is a cross-correlation analysis diagram of the AC fluctuation components of the concentration waveform in an embodiment of the present invention; Figure 6 This is a comparison chart showing the corrosion rate control effects of different dosing systems in embodiments of the present invention. Detailed Implementation

[0016] The technical solutions in 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.

[0017] See attached document Figure 1 This invention provides an online monitoring system for corrosion rate in a closed water system and an intelligent dosing system for corrosion inhibitors, comprising: a main circulation network, a main circulation pump, a sensor acquisition unit, a dosing execution unit, and a control and calculation unit.

[0018] The main circulation pump is located within the main circulation network. It drives the fluid to circulate within the network. The sensing and acquisition unit includes a dual-channel online fluorescence spectrophotometer and a makeup water flow meter. The dual-channel online fluorescence spectrophotometer is installed on the main circulation network at the outlet of the main circulation pump. It directly contacts the fluid within the main circulation network. The makeup water flow meter is located on the makeup water line of the closed-loop water system. The chemical dosing unit includes a high-frequency pulse metering pump. The pump's inlet is connected to the main circulation network. It injects chemicals into the main circulation network.

[0019] The sensor acquisition unit is connected to the control and processing unit via a cable. A dual-channel online fluorescence spectrophotometer transmits the acquired concentration electrical signal to the control and processing unit. A makeup water flow meter transmits the measured makeup water flow electrical signal to the control and processing unit. The control and processing unit is connected to the dosing execution unit via a communication line. The control and processing unit sends dosing pulse control commands to the high-frequency pulse metering pump. The high-frequency pulse metering pump starts, stops, and adjusts the dosing frequency according to the received dosing pulse control commands.

[0020] The control and arithmetic unit stores system constants and receives system variables in real time. The fixed total water volume of a closed-loop water system is defined as V, with the unit being m³. 3 The rated volumetric flow rate of the main circulating pump is defined as Q. c The unit of flow rate is m 3 / h. The nominal cross-sectional area of ​​the main circulation network is defined as A. p The area unit is m 2 The average flow velocity of fluid within the main circulation network is defined as v, with units of m / h. The formula for calculating the average flow velocity v is: ; In the formula, v represents the average fluid velocity; Q c Represents the rated volumetric flow rate; A p Represents the nominal cross-sectional area.

[0021] The reagent comprises an inert tracer and an active corrosion inhibitor. A dual-channel online fluorescence spectrophotometer simultaneously detects the concentrations of both the inert tracer and the active corrosion inhibitor. The real-time mass concentration of the inert tracer at time t is defined as Ct. I (t), where the concentration unit is mg / L. The real-time mass concentration of the active corrosion inhibitor at time t is defined as Ct. A (t), concentration unit is mg / L.

[0022] The control and processing unit contains a control program. This program coordinates the operational states of the sensing and acquisition unit and the dosing execution unit. During the initial system commissioning phase, the control and processing unit controls the dosing execution unit to perform short-duration pulse dosing. The control and processing unit records the concentration waveform within the fluid circulation cycle using the sensing and acquisition unit. The extracted concentration waveform is then stored as a spatiotemporal reference line.

[0023] In continuous operation, the control unit uses the real-time mass concentration C of the inert tracer transmitted in real time by the dual-channel online fluorescence spectrophotometer. I (t) and the real-time mass concentration of the active corrosion inhibitor C A (t) Calculate the concentration decay rate. The control unit uses the difference in decay rates to identify the physical loss. The control unit then calculates the global pure chemical consumption rate.

[0024] When the control unit determines that the differential value of the global pure chemical consumption rate exceeds a set threshold, it extracts the AC fluctuation concentration component within one cycle. The control unit performs waveform cross-correlation analysis. It then calculates the maximum time offset of the concentration waveform. Finally, the control unit combines this with the average fluid velocity v to map the unidirectional physical distance of fluid transport in the localized corrosion zone.

[0025] The control unit predicts the arrival time of the next fluid peak in the localized corrosion area based on the calculated time offset. The control unit then sends a feedforward pulse control command to the dosing unit. The high-frequency pulse metering pump in the dosing unit injects a high concentration of active corrosion inhibitor into the main circulation network at the predicted time. The high-concentration agent peak is carried by the fluid and covers the localized corrosion area at the predicted time.

[0026] See attached document Figure 2 The present invention provides an online monitoring system for corrosion rate of closed water systems and an intelligent dosing system for corrosion inhibitors, comprising: a fluid spatiotemporal baseline calibration module, a global pure chemical consumption rate dynamic decoupling module, a local corrosion spatial mapping module, and a phase shift targeted pulse feedforward dosing control module.

[0027] The control and computation unit contains a control program. The fluid spatiotemporal baseline calibration module, the global pure chemical consumption rate dynamic decoupling module, the local corrosion spatial mapping module, and the phase-shift targeted pulse feedforward dosing control module are the functional calculation modules divided by the control program.

[0028] The fluid spatiotemporal baseline calibration module receives a fixed total water volume V and a rated volumetric flow rate Q. c The fluid spatiotemporal baseline calibration module calculates the fundamental fluid circulation period. The fundamental fluid circulation period is defined as T. c The time unit is hours (h). The formula for calculating the basic cycle of fluid circulation is: ; In the formula, T c V represents the basic cycle of fluid circulation; Q represents the total fixed water volume; c Represents the rated volumetric flow rate. Fluid circulation cycle T c It expresses the time required for a fluid to complete one cycle in the main circulation network.

[0029] The fluid spatiotemporal baseline calibration module extracts and stores the physical transport time-domain reference function. The physical transport time-domain reference function is defined as F. base (t). Physical transmission time-domain reference function F base (t) represents waveform data showing the change in concentration of an inert tracer over time.

[0030] The global pure chemical consumption rate dynamic decoupling module receives the real-time mass concentration C of the inert tracer at time t. I (t) and receive the real-time mass concentration C of the active corrosion inhibitor at time t. A (t). The global pure chemical consumption rate dynamic decoupling module calculates the normalized decay rate. The normalized decay rate of the inert tracer is defined as N. I (t). The normalized decay rate of the active corrosion inhibitor is defined as N. A (t). Normalized decay rate expresses the first-order instantaneous decay rate of the drug concentration in the time domain.

[0031] The global pure chemical consumption rate dynamic decoupling module calculates the global pure chemical consumption rate. The global pure chemical consumption rate is defined as R. chem (t), in mg / h. The formula for calculating the global pure chemical consumption rate is: ; In the formula, R chem (t) represents the global pure chemical consumption rate; N A (t) represents the normalized decay rate of the active corrosion inhibitor; N I (t) represents the normalized decay rate of the inert tracer; C A (t) represents the real-time mass concentration of the active corrosion inhibitor at time t; V represents the fixed total water volume. Global pure chemical consumption rate R chem (t) represents the rate of reagent consumption under active corrosion conditions inside a closed water system.

[0032] The localized corrosion spatial mapping module receives concentration data and calculates the AC fluctuation component. The AC fluctuation component of the inert tracer is defined as c. I (t). The AC fluctuation component of the active corrosion inhibitor is defined as c. A (t). The local erosion spatial mapping module calculates the cross-correlation function. The cross-correlation function is defined as R. IA(τ). The localized corrosion spatial mapping module calculates the time offset. The time offset is defined as τ. max Time offset τ max The time difference at which the cross-correlation function reaches its maximum value.

[0033] The localized corrosion spatial mapping module calculates the physical distance of unidirectional fluid transport. The physical distance of unidirectional fluid transport is defined as L, with units of meters (m). The formula for calculating the physical distance of unidirectional fluid transport is: ; In the formula, L represents the physical distance of unidirectional fluid transport; v represents the average fluid velocity; τ max This represents the time offset.

[0034] The phase-shift targeted pulse feedforward dosing control module receives the global pure chemical consumption rate R. chem (t) and calculate the target mass of the active corrosion inhibitor. The target mass of the active corrosion inhibitor is defined as M. req The unit of mass is mg; the phase-shift targeted pulse feedforward dosing control module calculates the target time node. The target time node is defined as t. target The phase-shift targeted pulse feedforward dosing control module controls the drug delivery based on the target time node t. target Send feedforward pulse control commands to the dosing execution unit.

[0035] The online corrosion rate monitoring and intelligent corrosion inhibitor dosing system for the closed-loop water system is started and put into operation. The fluid spatiotemporal baseline calibration module sends a short-time pulse injection command to the dosing execution unit. The sensor acquisition unit acquires the concentration waveform and sends it to the fluid spatiotemporal baseline calibration module. The fluid spatiotemporal baseline calibration module establishes the spatiotemporal coordinate relationship.

[0036] The system then enters a continuous operation phase. The sensor acquisition unit continuously sends real-time mass concentration data to the global pure chemical consumption rate dynamic decoupling module. The global pure chemical consumption rate dynamic decoupling module performs differential stripping calculations and monitors the changes in the global pure chemical consumption rate.

[0037] When the global pure chemical consumption rate experiences an out-of-limit jump, the local corrosion spatial mapping module initiates the analysis program. The local corrosion spatial mapping module compares the baseline waveform with the real-time fluctuation components and calculates the physical distance of unidirectional fluid transport.

[0038] The phase-shift targeted pulse feedforward dosing control module predicts the dosing timing based on the physical distance of unidirectional fluid transport. At the target time, the module controls the dosing execution unit to perform pulsed dosing. The system completes targeted agent coverage of the localized corrosion area and restores the monitoring status of the continuous operation phase.

[0039] See attached document Figure 3The present invention provides a control step for an online monitoring system for corrosion rate of closed water systems and an intelligent dosing system for corrosion inhibitors, which includes: performing a fluid coordinate calibration step, performing a dynamic monitoring decoupling step, performing a waveform space mapping step, and performing a feedforward pulse dosing step.

[0040] The control unit coordinates the various internal control modules to execute the aforementioned control steps in chronological order. The fluid spatiotemporal baseline calibration module executes the fluid coordinate calibration step. The fluid spatiotemporal baseline calibration module sends a start command to the dosing execution unit. The high-frequency pulse metering pump performs a short-time pulse dosing action. The fluid spatiotemporal baseline calibration module records the drug concentration waveform in the initial state. The fluid spatiotemporal baseline calibration module saves the recorded concentration waveform as a physical transmission time domain reference function F. base (t). The system completes the initialization of basic parameters and establishes the hydrodynamic coordinate system of the pipeline network.

[0041] The global pure chemical consumption rate dynamic decoupling module executes dynamic monitoring and decoupling steps. A dual-channel online fluorescence spectrophotometer continuously acquires fluid concentration data. The global pure chemical consumption rate dynamic decoupling module receives this concentration data. The module then calculates the normalized decay rate N of the inert tracer. I (t) and calculate the normalized decay rate N of the active corrosion inhibitor. A (t). The global pure chemical consumption rate dynamic decoupling module calculates the global pure chemical consumption rate R using the decay rate difference. chem (t). The global pure chemical consumption rate dynamic decoupling module affects the global pure chemical consumption rate R. chem (t) Extract the first derivative over time. The global pure chemical consumption rate dynamic decoupling module determines whether the value of the first derivative over time exceeds a preset threshold.

[0042] When the first derivative of time exceeds a preset threshold, the system determines that a pipeline corrosion event has occurred, and the localized corrosion spatial mapping module executes the waveform spatial mapping step. c The internal concentration fluctuation values. The localized corrosion spatial mapping module performs waveform cross-correlation analysis. The localized corrosion spatial mapping module solves for the maximum time offset τ. max The localized corrosion spatial mapping module, combined with the average fluid velocity v, will determine the maximum time offset τ. max This is converted into the physical distance L of unidirectional fluid transport. The localized corrosion spatial mapping module completes the physical distance positioning of the localized corrosion area.

[0043] The phase-shift targeted pulse feedforward dosing control module executes the feedforward pulse dosing step. The module calculates the target mass M of the active corrosion inhibitor using a pure chemical consumption rate. reqThe phase-shift targeted pulse feedforward dosing control module calculates the target time node t. target The phase-shift targeted pulse feedforward dosing control module controls the drug delivery at the target time node t. target The control unit operates by injecting the target mass of active corrosion inhibitor into the main circulation network via a high-frequency pulse metering pump. The high-concentration agent peak flows with the fluid and is applied at the target time point t. target The system reaches a region of localized corrosion. Once the pure chemical consumption rate decreases, the system resets its parameters and returns to execute the dynamic monitoring decoupling step.

[0044] The fluid spatiotemporal baseline calibration module retrieves the basic equipment parameters stored within the control and arithmetic unit. The fluid spatiotemporal baseline calibration module reads the fixed total water volume V of the closed-loop water system. The fixed total water volume V represents the total volume of fluid contained within the main circulation network.

[0045] The fluid spatiotemporal baseline calibration module reads the operating parameters of the main circulation pump. The fluid spatiotemporal baseline calibration module obtains the rated volumetric flow rate Q of the main circulation pump. c Rated volumetric flow rate Q c This indicates the volumetric physical quantity by which the main circulation pump drives the fluid flow within the main circulation pipeline per unit time.

[0046] The fluid spatiotemporal baseline calibration module is based on a fixed total water volume V and a rated volumetric flow rate Q. c Initiate the basic cycle calculation program. The fluid spatiotemporal baseline calibration module calculates the fixed total water volume V and the rated volumetric flow rate Q. c The quotient value. The fluid spatiotemporal baseline calibration module outputs the aforementioned quotient value as the fluid circulation fundamental period T. c The basic cycle time T of the fluid circulation c Expresses the complete time it takes for a fluid particle to flow through the main circulation network and return to its starting point.

[0047] The control and processing unit stores the basic fluid circulation cycle T. c The localized corrosion spatial mapping module calls the fluid circulation base cycle T in the subsequent waveform spatial mapping step. c The basic cycle time T of the fluid circulation c The length of the time window that constitutes the interception of concentration fluctuation components. The basic fluid circulation period T. c The integral interval span constituting the cross-correlation function calculation. The phase-shift targeted pulse feedforward dosing control module utilizes the fluid circulation baseline period T. c Calculate the target time node t of the feedforward pulse injection step target The system thus completes the process of constructing the hydraulic time basis within the fluid spatiotemporal baseline calibration module.

[0048] The fluid spatiotemporal baseline calibration module completes the basic fluid circulation cycle T. cAfter the calculation, the signal excitation program is initiated. The fluid spatiotemporal reference line calibration module generates a short-time pulse injection command. The fluid spatiotemporal reference line calibration module sends the short-time pulse injection command to the control calculation unit. The control calculation unit receives the short-time pulse injection command and parses it.

[0049] The fluid spatiotemporal baseline calibration module sets the pulse injection time parameter. The pulse injection time is defined as Δt, with the unit of time being hours (h). The fluid spatiotemporal baseline calibration module limits the pulse injection time Δt to be much smaller than the fluid circulation period T. c The pulse injection time Δt satisfies the following mathematical relationship: ; In the formula, Δt represents the pulse injection time; T c It represents the basic cycle of fluid circulation.

[0050] The control unit sends a drive signal to the dosing execution unit based on the short-time pulse dosing command and the pulse injection time Δt. The dosing execution unit receives the drive signal. The high-frequency pulse metering pump inside the dosing execution unit starts operating within the pulse injection time Δt.

[0051] A high-frequency pulse metering pump injects a fixed amount of mixed reagent into the main circulation pipeline. The mixed reagent contains a predetermined ratio of inert tracer and active corrosion inhibitor. The high-frequency pulse metering pump completes the injection within a short time window and then stops operating.

[0052] The mixed reagent enters the fluid within the main circulation network. The mixed reagent and fluid combine to create a high-concentration reagent distribution area. This high-concentration reagent distribution area manifests as a concentration peak in the hydrodynamic space. The concentration peak is propagated forward within the main circulation network by the fluid driven by the main circulation pump. The system completes the excitation process of the physical signals required for spatiotemporal baseline calibration.

[0053] The concentration peak flows with the fluid within the main circulation network and reaches the installation location of the sensing unit. The dual-channel online fluorescence spectrophotometer initiates the continuous measurement program. The dual-channel online fluorescence spectrophotometer continuously samples the flowing fluid.

[0054] The dual-channel online fluorescence spectrophotometer acquires the real-time mass concentration C of the inert tracer at time t. I (t). The dual-channel online fluorescence spectrophotometer transmits the measured concentration electrical signal to the control and processing unit in real time. The fluid spatiotemporal reference calibration module deployed inside the control and processing unit receives the concentration electrical signal.

[0055] The fluid spatiotemporal baseline calibration module includes a fluid circulation fundamental cycle T. c Record the real-time mass concentration C of the inert tracer within the time window. IThe continuous values ​​of (t) are used to calibrate the fluid spatiotemporal baseline. The fluid spatiotemporal baseline calibration module combines the recorded continuous values ​​into a waveform data sequence in the time domain.

[0056] Inert tracers do not participate in chemical reactions on metal surfaces within a closed water system. The waveform data sequence extracted by the fluid spatiotemporal baseline calibration module only reflects the physical diffusion and dispersion phenomena that occur during the fluid flow within the main circulation network.

[0057] The fluid spatiotemporal baseline calibration module sets the extracted waveform data sequence as the physical transmission time domain reference function F. base (t). The fluid spatiotemporal baseline calibration module will physically transmit the time-domain reference function F. base (t) is written into the memory of the control arithmetic unit.

[0058] The control unit uses the physical transmission time-domain reference function F base (t) Perform solidified storage operation. Physical transmission time-domain reference function F base (t) Provides a waveform comparison benchmark to eliminate the influence of physical interference in subsequent control steps. The fluid spatiotemporal reference calibration module has now completed the task of establishing spatiotemporal coordinates during the initial operation phase of the system.

[0059] The closed-loop water system has entered the continuous operation phase. The dual-channel online fluorescence spectrophotometer in the sensing and acquisition unit initiates its high-frequency acquisition program. The dual-channel online fluorescence spectrophotometer detects the fluid flowing inside the main circulation network according to the preset sampling frequency.

[0060] The dual-channel online fluorescence spectrophotometer simultaneously acquires the real-time mass concentration C of the inert tracer at time t. I (t) and the real-time mass concentration C of the active corrosion inhibitor at time t A (t). The dual-channel online fluorescence spectrophotometer sends the measured concentration data to the control and processing unit.

[0061] The global pure chemical consumption rate dynamic decoupling module within the TT control unit receives the measured concentration data. This module monitors the real-time mass concentration C of the inert tracer at any given time. I (t) Extract the first derivative in the time domain. The global pure chemical consumption rate dynamic decoupling module measures the real-time mass concentration C of the active corrosion inhibitor at time t. A (t) Extracts the first derivative in the time domain.

[0062] The global pure chemical consumption rate dynamic decoupling module extracts the instantaneous decay rate of the agent in the time domain. This module performs normalization and dimensionality reduction, and eliminates the computational impact caused by the different initial concentrations of the two agents.

[0063] The global pure chemical consumption rate dynamic decoupling module calculates the normalized decay rate N of the inert tracer. I (t). Normalized decay rate N of the inert tracer I The formula for calculating (t) is: ; In the formula, N I (t) represents the normalized decay rate of the inert tracer; C I (t) represents the real-time mass concentration of the inert tracer at time t; t represents time. This represents the first derivative of the real-time mass concentration of the inert tracer in the time domain.

[0064] The global pure chemical consumption rate dynamic decoupling module calculates the normalized decay rate N of the active corrosion inhibitor. A (t). Normalized decay rate N of the active corrosion inhibitor. A The formula for calculating (t) is: ; In the formula, N A (t) represents the normalized decay rate of the active corrosion inhibitor; C A (t) represents the real-time mass concentration of the active corrosion inhibitor at time t; t represents time. This represents the first derivative of the real-time mass concentration of the active corrosion inhibitor in the time domain.

[0065] The global pure chemical consumption rate dynamic decoupling module completes the data dimensionality reduction calculation process. The normalized decay rate data output by dimensionality reduction reflects the proportion of reagent consumption under unit concentration conditions. The dimensionality reduction calculation process provides a unified mathematical benchmark for the subsequent separation physical loss of the system.

[0066] When physical leakage occurs within the main circulation network, the total internal fluid volume decreases. The makeup water flow meter monitors the makeup water action and sends a flow measurement signal to the control and processing unit. The decrease in fluid concentration caused by physical leakage exhibits a proportional attenuation change for both inert tracers and active corrosion inhibitors.

[0067] The inert tracer does not participate in the chemical film-forming reaction on the metal surface inside the main circulation network. The global pure chemical consumption rate dynamic decoupling module retrieves the normalized decay rate N of the inert tracer. I (t). Normalized decay rate N of the inert tracer I (t) represents the rate of pure physical loss caused solely by physical seepage within a closed water system.

[0068] The global pure chemical consumption rate dynamic decoupling module retrieves the normalized decay rate N of the active corrosion inhibitor. A (t). Normalized decay rate N of the active corrosion inhibitor. A(t) includes the proportion of purely physical loss and the proportion of chemical film formation consumption. The global pure chemical consumption rate dynamic decoupling module starts the differential stripping calculation program.

[0069] The global pure chemical consumption rate dynamic decoupling module performs a subtraction operation. This module calculates the normalized decay rate N of the active corrosion inhibitor. I (t) minus the normalized decay rate N of the inert tracer A (t) is the difference in the proportion of purely chemical consumption. The aforementioned difference completely eliminates the physical interference factors caused by water leakage.

[0070] The global pure chemical consumption rate dynamic decoupling module combines a fixed total water volume V and a real-time mass concentration C of the active corrosion inhibitor at time t. A (t) Perform the multiplication operation. The global pure chemical consumption rate dynamic decoupling module multiplies the aforementioned pure chemical consumption ratio difference by the real-time mass concentration C of the active corrosion inhibitor at time t. A (t) and further multiplied by the fixed total water volume V.

[0071] The global pure chemical consumption rate R is obtained by mathematical stripping calculation from the output of the global pure chemical consumption rate dynamic decoupling module. chem (t). The global pure chemical consumption rate dynamic decoupling module removes interference data caused by leakage in the main circulation pipeline network through differential calculation. The system obtains real-time reagent consumption data that accurately reflects the active corrosion state inside the pipeline network and provides a basis for judgment in subsequent steps.

[0072] The global pure chemical consumption rate dynamic decoupling module obtains the global pure chemical consumption rate R. chem (t). The global pure chemical consumption rate dynamic decoupling module affects the global pure chemical consumption rate R. chem (t) Extract the first-order time derivative. The first-order time derivative is defined as... First derivative of time Expressing global pure chemical consumption rate R chem (t) is a numerical value that changes over time.

[0073] The control unit internally stores a positive step threshold. The positive step threshold is defined as δ. The positive step threshold δ constitutes the baseline for determining the trigger of active corrosion events. The global pure chemical consumption rate dynamic decoupling module retrieves the positive step threshold δ.

[0074] The global pure chemical consumption rate dynamic decoupling module initiates a threshold comparison procedure. The global pure chemical consumption rate dynamic decoupling module uses the first derivative of time... The value is compared with the positive step threshold δ. The global pure chemical consumption rate dynamic decoupling module executes the trigger judgment based on the following judgment relationship: ; In the formula, δ represents the first time derivative; δ represents the positive step threshold.

[0075] When the first time derivative When the value exceeds the positive step threshold δ, it indicates that the passivation film on the metal surface inside the main circulation pipeline has been damaged. An active corrosion event is occurring inside the main circulation pipeline. The global pure chemical consumption rate dynamic decoupling module generates anti-corrosion repair trigger commands.

[0076] The global pure chemical consumption rate dynamic decoupling module sends the anti-corrosion repair trigger command to the local corrosion spatial mapping module. The local corrosion spatial mapping module receives the anti-corrosion repair trigger command and then initiates subsequent waveform analysis operations.

[0077] When the normalized decay rate N of the inert tracer I The value of (t) increases, and the time first derivative... When the value is less than or equal to the positive step threshold δ, the global pure chemical consumption rate dynamic decoupling module determines that only physical leakage events have occurred inside the main circulation network.

[0078] In this state, the control unit controls the dosing unit to replenish the base loss according to the physical leakage ratio. The global pure chemical consumption rate dynamic decoupling module does not trigger the local corrosion spatial mapping module. The system maintains a dynamic monitoring state for the global pure chemical consumption rate.

[0079] Upon receiving the anti-corrosion repair trigger command, the localized corrosion spatial mapping module initiates the waveform capture program. The localized corrosion spatial mapping module then retrieves the fluid circulation baseline period T stored within the control calculation unit. c The localized corrosion spatial mapping module utilizes the fluid circulation base period T. c Construct a data capture time window. The time span of the data capture time window is the same as the basic fluid circulation period T. c Consistent.

[0080] The localized corrosion spatial mapping module extracts real-time concentration data sequences within a time window. It also acquires the real-time mass concentration C of the inert tracer within that time window. I (t) is a continuous value. The localized corrosion spatial mapping module acquires data and extracts the real-time mass concentration C of the active corrosion inhibitor within the time window. A The continuous values ​​of (t).

[0081] The localized corrosion spatial mapping module performs mathematical integration on the extracted concentration data sequence and calculates the time average. The module then calculates the mean concentration of the inert tracer. The mean concentration of the inert tracer is defined as follows: The localized corrosion spatial mapping module calculates the average concentration of the active corrosion inhibitor. The average concentration of the active corrosion inhibitor is defined as follows: The mean concentration represents the static baseline portion of the concentration signal.

[0082] The localized corrosion spatial mapping module initiates the de-meaning process. It subtracts the concentration mean from the real-time values. The module then extracts the pure AC fluctuation component. Finally, it calculates the AC fluctuation component c of the inert tracer. I (t). AC fluctuation component c of inert tracer I The formula for calculating (t) is: ; In the formula, c I (t) represents the AC fluctuation component of the inert tracer; C I (t) represents the real-time mass concentration of the inert tracer at time t; This represents the average concentration of the inert tracer.

[0083] The localized corrosion spatial mapping module calculates the AC fluctuation component c of the active corrosion inhibitor. A (t). AC fluctuation component c of active corrosion inhibitor. A The formula for calculating (t) is: ; In the formula, c A (t) represents the AC fluctuation component of the active corrosion inhibitor; C A (t) represents the real-time mass concentration of the active corrosion inhibitor at time t; This represents the average concentration of active corrosion inhibitors.

[0084] The localized corrosion spatial mapping module removes static background values ​​from the concentration waveform data. It then obtains a pure fluctuation data sequence free from the influence of the global concentration baseline. Finally, the module outputs the extracted AC fluctuation components to the subsequent waveform cross-correlation analysis program.

[0085] The localized corrosion spatial mapping module obtains the AC fluctuation component c of the inert tracer calculated in the aforementioned steps. I (t) and the AC fluctuation component of the active corrosion inhibitor c A (t). Localized corrosion zones within the main circulation network consume active corrosion inhibitors. The film-forming consumption process causes AC fluctuations in the active corrosion inhibitor component c. A (t) A time lag occurs. Inert tracers do not participate in the film-forming reaction. The AC fluctuation component c of the inert tracer... I (t) Maintain the original time phase reference.

[0086] The localized corrosion spatial mapping module initiates the cross-correlation analysis program. Within the time span of the fluid circulation baseline period t, the module constructs a mathematical integral expression. The module introduces a time-delayed independent variable, defined as τ, with the time unit being hours (h).

[0087] The localized corrosion spatial mapping module constructs the cross-correlation function R. IA (τ). Cross-correlation function R IA The formula for calculating (τ) is: ; In the formula, R IA (τ) represents the cross-correlation function; τ represents the time-delayed independent variable; T c Represents the basic cycle of fluid circulation; t represents time; c I (t) represents the AC fluctuation component of the inert tracer; c A (t-τ) represents the AC fluctuation component of the active corrosion inhibitor after introducing the time delay independent variable.

[0088] The localized corrosion spatial mapping module continuously changes the value of the time-delay independent variable τ within a set range. The module performs integration operations for each set time-delay independent variable τ. The module calculates a series of cross-correlation functions R. IA Numerical results for (τ).

[0089] The localized corrosion spatial mapping module applies a series of cross-correlation functions R IA The numerical results of (τ) were mathematically compared. The local corrosion spatial mapping module found the cross-correlation function R. IA (τ) is the time delay independent variable that reaches its maximum value.

[0090] The localized corrosion spatial mapping module will use the cross-correlation function R IA The time delay independent variable output corresponding to when (τ) reaches its maximum value is the time offset τ. max Time offset τ max This characterizes the actual time delay of the concentration trough of the active corrosion inhibitor relative to the concentration waveform of the inert tracer. The localized corrosion spatial mapping module completes the quantitative solution of the waveform lag time and calculates the time offset τ. max Stored in the control and arithmetic unit.

[0091] The present invention provides an equivalent mapping calculation logic for the physical distance of localized corrosion areas in a closed water system, which may include: extracting time offset data, retrieving fluid velocity parameters, performing spatiotemporal transformation calculations, and locating the coordinates of localized corrosion.

[0092] The localized corrosion spatial mapping module initiates the spatiotemporal mapping calculation program. The localized corrosion spatial mapping module reads the time offset τ from the storage space of the control and computation unit. max Time offset τ max Expresses the delayed value of the concentration fluctuation of the active corrosion inhibitor on the time coordinate system.

[0093] The localized corrosion spatial mapping module retrieves the hydraulic parameters of the main circulation network. This module also obtains the average fluid velocity v. The average fluid velocity v represents the rate of change of physical displacement of fluid particles propagating along the internal axis of the main circulation network.

[0094] The localized corrosion spatial mapping module transforms time-dimensional parameters into spatial-dimensional parameters. It performs numerical multiplication operations. The localized corrosion spatial mapping module then converts the time offset τ... max Multiply by the average fluid velocity v to obtain the physical distance L of unidirectional fluid transport.

[0095] The unidirectional fluid transport physical distance L indicates the actual length of the pipeline from the location of localized corrosion along the flow direction of the main circulation network to the installation location of the dual-channel online fluorescence spectrophotometer. The localized corrosion spatial mapping module completes the spatial physical location calculation process for concealed localized corrosion areas.

[0096] The localized corrosion spatial mapping module stores the unidirectional fluid transmission physical distance L in the control calculation unit. This unidirectional fluid transmission physical distance L forms the spatial coordinate basis for the system's targeted drug injection operation. The phase-shift targeted pulse feedforward drug injection control module uses the unidirectional fluid transmission physical distance L to predict and calculate the drug injection time point in subsequent control steps.

[0097] After the localized corrosion spatial mapping module completes the calculation of the physical distance L for unidirectional fluid transport, the phase-shift targeted pulse feedforward dosing control module initiates the required mass calculation program. The phase-shift targeted pulse feedforward dosing control module receives the global pure chemical consumption rate R sent by the control calculation unit. chem (t). Global pure chemical consumption rate R chem (t) reflects the real-time consumption of reagents caused by active corrosion events within the main circulation network.

[0098] The phase-shift targeted pulse feedforward dosing control module sets the time interval for mathematical integration. The phase-shift targeted pulse feedforward dosing control module acquires the corrosion event start time. The corrosion event start time is defined as t. start Corrosion event start time t start The trigger time corresponds to when the first derivative value exceeds the positive step threshold δ. The phase-shift targeting pulse feedforward dosing control module obtains the calculation termination time. The calculation termination time is defined as t. end Calculate the termination time t.end This corresponds to the current computation time.

[0099] The phase-shift targeted pulse feedforward dosing control module performs mathematical integration within a set time interval. The module calculates the target mass M of the active corrosion inhibitor. req Target mass M of active corrosion inhibitor req The calculation formula is: ; In the formula, M req Represents the target quality of the active corrosion inhibitor; t start Represents the start time of the corrosion event; t end R represents the calculation termination time; chem (t) represents the global pure chemical consumption rate; t represents time.

[0100] The phase-shift targeted pulse feedforward dosing control module calculates the total physical quantity of active corrosion inhibitor consumed in the localized corrosion zone within the main circulation pipeline using the aforementioned definite integral calculation. The definite integral calculation result excludes the fluid basis loss and quantifies only the mass of reagent consumed by the chemical film-forming reaction.

[0101] Target mass M of active corrosion inhibitor req These constitute the basic dosing reference parameters for the dosing execution unit to perform repair dosing actions. The control calculation unit then calculates the target mass M of the active corrosion inhibitor. req The data is stored in the memory. During this control step, the system performs the mathematical conversion of the repair dosage from consumption rate data to the absolute required quality dimension.

[0102] The phase-shift targeted pulse feedforward dosing control module executes the targeted fluid phase arrival time feedforward prediction step. The module reads the unidirectional fluid transport physical distance L from the control processing unit. It also reads the average fluid velocity v and the fluid circulation cycle T. c .

[0103] The phase-shift targeted pulse feedforward dosing control module acquires the current system standard time. The current system standard time is defined as t. now The phase-shift targeted pulse feedforward dosing control module initiates the time phase prediction calculation program.

[0104] The phase-shift targeted pulse feedforward dosing control module converts spatial physical distance into fluid phase delay in the time dimension. The module obtains the time offset parameter of the localized corrosion region by dividing the unidirectional fluid transmission physical distance L by the average fluid velocity v.

[0105] The phase-shift targeted pulse feedforward dosing control module calculates the target time node t.target Target time node t target The calculation formula is: ; In the formula, t target Represents the target time point; t now T represents the current system standard time; c L represents the basic cycle of fluid circulation; L represents the physical distance of unidirectional fluid transport; v represents the average fluid velocity.

[0106] The phase-shift targeted pulse feedforward dosing control module establishes a time reference for the dosing action through feedforward prediction calculations. Target time node t target This specifies the physical moment when the drug delivery unit initiates the drug delivery action.

[0107] The phase-shift targeted pulse feedforward dosing control module will target time node t target The data is written to the control calculation unit. The system completes the time parameter setting operation of the feedforward control mechanism and enters the drug injection waiting stage. The time feedforward mechanism constructed by the phase-shift targeted pulse feedforward drug injection control module ensures that the drug peak accurately reaches the spatial location of localized corrosion inside the main circulation network in the next fluid circulation cycle.

[0108] The control and arithmetic unit has a built-in system clock program. The control and arithmetic unit continuously monitors the current system standard time t. now The numerical change. The phase-shift targeted pulse feedforward dosing control module extracts the target time node t stored internally in the control calculation unit. target .

[0109] The phase-shift targeted pulse feedforward dosing control module will use the current system standard time t now With the target time node t target Conduct numerical comparisons. Current system standard time t now Proceed to the target time node t target The phase-shift targeted pulse feedforward dosing control module generates pulse dosing trigger commands.

[0110] The phase-shift targeted pulse feedforward dosing control module sends a pulse dosing trigger command to the dosing execution unit. The dosing execution unit receives the pulse dosing trigger command and drives the internal high-frequency pulse metering pump to start operation.

[0111] The high-frequency pulse metering pump reads the target mass M of the active corrosion inhibitor stored inside the control and processing unit. req A high-frequency pulse metering pump injects pure active corrosion inhibitor into the fluid inside the main circulation pipeline. The physical quantity of the injected pure active corrosion inhibitor is equal to the target mass M of the active corrosion inhibitor. req The high-frequency pulse metering pump performs a short-duration high-frequency pumping action and stops operating after the injection is complete.

[0112] The injected pure active corrosion inhibitor forms a high concentration range in the fluid within the main circulation network. This high concentration range is represented by a peak in the active corrosion inhibitor concentration along the fluid flow direction. This peak in the active corrosion inhibitor concentration moves downstream with the fluid within the main circulation network.

[0113] The phase-shift targeted pulse feedforward dosing control module establishes a time reference that ensures the peak concentration of the active corrosion inhibitor reaches the location of localized corrosion precisely as it flows through the main circulation network. This allows the pipe wall at the location of localized corrosion to acquire a high concentration of pure active corrosion inhibitor. The system then performs spatial alignment repair of the localized corrosion area while reducing total reagent consumption.

[0114] The phase-shift targeted pulse feedforward dosing control module confirms that the dosing execution unit has completed the dosing action. The phase-shift targeted pulse feedforward dosing control module sends a status reset command to the control calculation unit.

[0115] The control unit receives a status reset command. The control unit clears the internally stored target mass M of the active corrosion inhibitor. req The control unit clears the time offset τ of its internal storage. max The physical distance L of unidirectional fluid transport. The control and processing unit will target the time node t. target The value is set to zero.

[0116] The global pure chemical consumption rate dynamic decoupling module receives a status reset command. This module clears the global pure chemical consumption rate R generated by previous calculations. chem Historical cache data of (t). The global pure chemical consumption rate dynamic decoupling module clears the time first derivative generated by previous calculations. Historical cached data. The local erosion spatial mapping module stops the waveform extraction program and enters standby monitoring mode.

[0117] The dual-channel online fluorescence spectrophotometer inside the sensing and acquisition unit maintains a continuous high-frequency sampling program. The control and processing unit enters a new global decay monitoring cycle. The global pure chemical consumption rate dynamic decoupling module recalculates the normalized decay rate N of the inert tracer. I (t). The global pure chemical consumption rate dynamic decoupling module recalculates the normalized decay rate N of the active corrosion inhibitor. A (t).

[0118] The closed-loop water system was restored to its initial dynamically decoupled monitoring state. The control processing unit continuously monitored the first derivative of time. The numerical relationship with the positive step threshold δ. The system forms a closed-loop control link from anomaly detection, spatial localization, targeted repair to state recovery.

[0119] Specific application example: Intelligent anti-corrosion dosing for a closed-loop cooling water system in a chemical plant. This embodiment is applied to an intelligent anti-corrosion chemical dosing monitoring system for a closed-loop cooling water system. The system infers the location of localized corrosion damage by capturing microscopic concentration fluctuations within the pipe network, and then performs feedforward targeted precision chemical injection and anti-corrosion repair.

[0120] System construction and basic parameter preparation: The system comprises a main circulation pipeline network and high-frequency pulse metering pumps. The total fixed water volume of the main circulation pipeline network is V=500m³. 3 Rated volumetric flow rate Q of the main circulation pump c =1000m 3 Nominal cross-sectional area A p =0.2m 2 .

[0121] When the system is first started, hydraulic parameters are calculated: Average fluid velocity v=Q c / A p =1000 / 0.2=5000m / h; Fluid circulation basic period T c =V / Q c =500 / 1000=0.5h (i.e., 30 minutes). This means that the total equivalent length of the main circulation pipeline is 2500 meters, and it takes 30 minutes for the fluid to travel around once.

[0122] During the system startup and calibration phase, a high-frequency pulse metering pump briefly injects the mixed reagent, and the control and processing unit records the waveform data of the inert tracer concentration changing over time, storing it as the physical transmission time-domain reference function F. base (t), thus completing the establishment of the fluid dynamics coordinate system.

[0123] Dynamic decoupling monitoring and corrosion event triggering analysis: During continuous operation, the system acquires real-time concentration C. I (t) and C A (t). During the second hour of operation, an active localized corrosion event occurred due to damage to the pipeline's anti-corrosion layer. At this time, a large amount of active corrosion inhibitor was consumed to form a film on the exposed metal surface. The global pure chemical consumption rate dynamic decoupling module was used to isolate the system's physical water replenishment interference, and the true global pure chemical consumption rate R was calculated. chem (t).

[0124] Combined with appendix Figure 4 The figure shows the dynamic monitoring results over a runtime of 0 to 5 hours. The horizontal axis represents the runtime (h) in bold and magnified form, and the vertical axis represents the global pure chemical consumption rate (mg / h) in bold and magnified form. The legend box in the upper left corner of the screen indicates the global pure chemical consumption rate curve and the anti-corrosion repair trigger point.

[0125] Appendix Figure 4 The solid black line represents the overall pure chemical consumption rate curve. Two hours ago, the system was in a stable state, with the consumption rate maintained at a baseline trace consumption level of 1500 mg / h. In the second hour, the black solid line rose sharply, R chem The time-order first derivative of (t) undergoes a positive jump, exceeding the preset positive step threshold δ.

[0126] See attached document Figure 4 The system indicates that a corrosion event has occurred and triggers subsequent mapping calculations at coordinate t=2h with a dark gray dot mark and an accompanying text description of triggering the anti-corrosion repair command (derivative exceeding the limit).

[0127] Waveform space mapping and positioning solution evaluation: Upon trigger command, the system extracts the current fluid circulation base cycle T. c (i.e., the internal concentration fluctuation value between 2.0 and 2.5 hours). After demeaning, the pure AC fluctuation component c is obtained. I (t) and c A (t). Calculate the cross-correlation function R. IA (τ) Perform delay time optimization.

[0128] See Figure 5 The figure shows the results of cross-correlation analysis of the AC fluctuation components of the concentration waveform. The horizontal axis represents the large-font time-delay independent variable (h), and the vertical axis represents the large-font cross-correlation function value. The upper left corner shows the legend of the cross-correlation waveform components.

[0129] The solid black lines in the figure represent the cross-correlation waveform components; As indicated by the bold downward arrow and numerical labels above, a single peak appears at the 0.3h position on the horizontal axis, and the maximum time offset (0.30h) is clearly marked directly above the arrow.

[0130] The above data shows that when τ max The cross-correlation function reaches its maximum value when h = 0.3. Then, spatial mapping is performed: the actual unidirectional fluid transport distance L = v·τ max =5000m / h.0.3h=1500m. The system successfully located the physical position of the localized corrosion area 1500 meters downstream of the sensor.

[0131] Feedforward Targeted Early Warning and Drug Delivery Strategy Implementation: Based on the above identification results, the system operation logic is as follows: The phase-shift targeted pulse feedforward dosing control module performs definite integral on the pure chemical consumption rate within the start and end time to calculate the required target mass M of the active corrosion inhibitor. req=2.5kg. Predict the time required for drug delivery and calculate the target time point: .

[0132] When the system's current time advances to t target At that moment, the metering pump instantly injects 2.5 kg of pure active agent into the pipeline network. Precise phase shift calculations ensure that the resulting high-concentration agent peak is transmitted through the pipeline network, reaching the corrosion failure point located at 1500 meters precisely during the active corrosion period, achieving high-concentration targeted coating film formation and rapidly inhibiting corrosion behavior.

[0133] To verify the control effect, two parallel closed water systems were set up for a 30-day comparative test.

[0134] Combination Figure 6 The figure shows a comparison of the corrosion rate control effects of different dosing systems. The horizontal axis represents the experimental run time (days), and the vertical axis represents the average corrosion rate of the system (mm / a).

[0135] The dotted lines marked with hollow squares in the figure represent the traditional continuous dosing system (control group). Faced with the local water quality deterioration and damage events that occurred on the 10th and 22nd days, the concentration reaching the local corrosion points was insufficient due to the dilution effect brought by the pipeline network. The control was lagging and the baseline was too high, and the corrosion rate continued to fluctuate at a high level. The solid lines marked with dark gray circles in the figure represent the intelligent dosing system of the present invention (experimental group). After corrosion signs were detected on the 10th and 22nd days, the system was able to quickly target and suppress the corrosion points within 1 to 2 days, with minimal fluctuations and keeping the average corrosion rate of the system within a low safety standard for a long period of time.

[0136] In summary, this embodiment, through dynamic decoupling and spatial mapping algorithms, demonstrated excellent targeted control effects in comparative experiments. Data shows that the monthly average corrosion rate of the system of this invention is reduced by 45% compared to traditional methods, while the overall consumption of corrosion inhibitors is reduced by 32%, meeting the practical needs of intelligent anti-corrosion dosing in closed-loop cooling water systems.

Claims

1. A closed-loop water system corrosion rate online monitoring and intelligent corrosion inhibitor dosing system, characterized in that, include: The main circulation pump is arranged in the main circulation pipeline network and is used to drive the fluid to circulate within the main circulation pipeline network. The control and processing unit internally stores the positive step threshold and the average fluid velocity; A sensing and acquisition unit, connected to the control and processing unit, is used to detect and transmit the real-time mass concentration of the inert tracer and the real-time mass concentration of the active corrosion inhibitor to the control and processing unit. The dosing execution unit is connected to the control and calculation unit, and the dosing port is connected to the main circulation pipeline. The control calculation unit calculates the global pure chemical consumption rate based on the difference between the real-time mass concentration of the inert tracer and the real-time mass concentration of the active corrosion inhibitor. When the time first derivative of the global pure chemical consumption rate is greater than the positive step threshold, the control calculation unit extracts the AC fluctuation component and performs waveform cross-correlation analysis to obtain the time offset. The time offset is combined with the average fluid velocity to obtain the physical distance of unidirectional fluid transmission. The control and calculation unit predicts the target time node based on the physical distance of the unidirectional fluid transmission, and sends a feedforward pulse control command to the dosing execution unit to drive the dosing execution unit to inject pure active corrosion inhibitor into the main circulation pipeline at the target time node.

2. The closed-loop water system corrosion rate online monitoring and intelligent corrosion inhibitor dosing system according to claim 1, characterized in that, The sensing and acquisition unit includes a dual-channel online fluorescence spectrophotometer and a water supply flow meter; The dual-channel online fluorescence spectrophotometer is installed on the main circulation pipeline at the outlet of the main circulation pump, and is in direct contact with the fluid inside the main circulation pipeline. The water supply flow meter is arranged on the water supply pipeline of the closed water system and is used to transmit the water supply flow electrical signal to the control and calculation unit; the dosing execution unit includes a high-frequency pulse metering pump.

3. The closed-loop water system corrosion rate online monitoring and intelligent corrosion inhibitor dosing system according to claim 1, characterized in that, The control and operation unit is equipped with a control program, which is divided into a fluid spatiotemporal baseline calibration module, a global pure chemical consumption rate dynamic decoupling module, a local corrosion spatial mapping module, and a phase shift targeted pulse feedforward dosing control module. The fluid spatiotemporal baseline calibration module is used to calculate the basic period of fluid circulation and extract the physical transport time domain reference function. The global pure chemical consumption rate dynamic decoupling module is used to monitor the change status of the global pure chemical consumption rate and generate anti-corrosion repair trigger commands. The localized corrosion spatial mapping module is used for waveform comparison analysis and solving the physical distance of unidirectional fluid transmission. The phase-shift targeted pulse feedforward dosing control module is used to predict the dosing timing and calculate the target mass of the active corrosion inhibitor.

4. The closed-loop water system corrosion rate online monitoring and intelligent corrosion inhibitor dosing system according to claim 3, characterized in that, The fluid spatiotemporal baseline calibration module receives a fixed total water volume and a rated volumetric flow rate, calculates the quotient of the fixed total water volume and the rated volumetric flow rate, and outputs the quotient as the basic cycle of the fluid circulation. The fluid spatiotemporal reference calibration module sends a short-time pulse injection command to the control and calculation unit and sets the pulse injection time. The control and calculation unit sends a drive electrical signal to the dosing execution unit according to the short-time pulse injection command and the pulse injection time. The high-frequency pulse metering pump inside the dosing execution unit starts running within the pulse injection time and injects a mixed agent containing a set ratio of inert tracer and active corrosion inhibitor into the main circulation pipeline. The fluid spatiotemporal baseline calibration module records continuous values ​​of the real-time mass concentration of the inert tracer within a time window that includes one of the fluid circulation basic cycles, and combines the recorded continuous values ​​into a waveform data sequence in the time domain, which is then set as the physical transmission time domain reference function.

5. The closed-loop water system corrosion rate online monitoring and intelligent corrosion inhibitor dosing system according to claim 3, characterized in that, The global pure chemical consumption rate dynamic decoupling module extracts the first derivative of the real-time mass concentration of the inert tracer and the first derivative of the real-time mass concentration of the active corrosion inhibitor in the time domain, respectively, performs normalization dimensionality reduction processing, and calculates the normalized decay rate of the inert tracer and the normalized decay rate of the active corrosion inhibitor.

6. The closed-loop water system corrosion rate online monitoring and intelligent corrosion inhibitor dosing system according to claim 5, characterized in that, The global pure chemical consumption rate dynamic decoupling module performs a subtraction operation to calculate the difference in the pure chemical consumption ratio obtained by subtracting the normalized decay rate of the active corrosion inhibitor from the normalized decay rate of the inert tracer. It then performs a multiplication operation by combining the fixed total water volume and the real-time mass concentration of the active corrosion inhibitor. The pure chemical consumption ratio difference is multiplied by the real-time mass concentration of the active corrosion inhibitor and the fixed total water volume to output the global pure chemical consumption rate. The global pure chemical consumption rate dynamic decoupling module extracts the first time derivative of the global pure chemical consumption rate, compares the first time derivative with the positive step threshold, and generates the anti-corrosion repair trigger command when the first time derivative is greater than the positive step threshold.

7. The closed-loop water system corrosion rate online monitoring and intelligent corrosion inhibitor dosing system according to claim 6, characterized in that, After receiving the anti-corrosion repair trigger command, the local corrosion spatial mapping module starts the waveform capture program, retrieves the fluid circulation basic cycle stored in the control calculation unit to construct a data capture time window, extracts the continuous values ​​of the real-time mass concentration of the inert tracer and the real-time mass concentration of the active corrosion inhibitor within the data capture time window, performs mathematical integration to solve for the time average, and calculates the average concentration of the inert tracer and the average concentration of the active corrosion inhibitor. The localized corrosion spatial mapping module initiates a de-averaging process, extracting the pure AC fluctuation component by subtracting the concentration mean from the real-time value, and calculating the AC fluctuation components of the inert tracer and the active corrosion inhibitor, respectively.

8. The closed-loop water system corrosion rate online monitoring and intelligent corrosion inhibitor dosing system according to claim 7, characterized in that, The local corrosion spatial mapping module initiates a cross-correlation analysis program, constructs a mathematical integral expression within the time span of the fluid circulation basic cycle, introduces a time-delay independent variable, and constructs a cross-correlation function by integrating the AC fluctuation component of the inert tracer with the AC fluctuation component of the active corrosion inhibitor after introducing the time-delay independent variable. The local corrosion spatial mapping module continuously changes the value of the time delay independent variable, performs an integral operation for each set time delay independent variable, calculates a series of cross-correlation function numerical results, performs mathematical comparison on the series of cross-correlation function numerical results, finds the time delay independent variable corresponding to the cross-correlation function reaching its maximum value, and outputs the time delay independent variable corresponding to the cross-correlation function reaching its maximum value as the time offset. The local corrosion spatial mapping module starts the spatiotemporal mapping calculation program, performs numerical multiplication operations, and multiplies the time offset by the average fluid velocity to obtain the physical distance of the fluid's unidirectional transmission.

9. The closed-loop water system corrosion rate online monitoring and intelligent corrosion inhibitor dosing system according to claim 8, characterized in that, The phase-shift targeted pulse feedforward dosing control module initiates the demand quality calculation program, receives the global pure chemical consumption rate sent by the control calculation unit, sets the time interval for mathematical integration, obtains the corrosion event start time, which corresponds to the triggering time when the first derivative of the time is greater than the positive step threshold, obtains the calculation termination time, which corresponds to the current calculation time, performs mathematical integration within the set time interval, and calculates the target quality of the active corrosion inhibitor.

10. The closed-loop water system corrosion rate online monitoring and intelligent corrosion inhibitor dosing system according to claim 9, characterized in that, The phase-shift targeted pulse feedforward dosing control module executes the targeted fluid phase arrival time feedforward prediction step, reads the fluid unidirectional transmission physical distance, the fluid average flow velocity, the fluid circulation basic cycle and obtains the current system standard time, starts the time phase prediction calculation program, and divides the fluid unidirectional transmission physical distance and the fluid average flow velocity to obtain the time offset parameter of the local corrosion area. The target time node is calculated as the current system standard time plus the fluid circulation basic cycle minus the time offset parameter; The phase-shift targeted pulse feedforward dosing control module compares the current system standard time with the target time node. When the current system standard time advances to the target time node, the phase-shift targeted pulse feedforward dosing control module generates a pulse injection trigger command and sends it to the dosing execution unit. The dosing execution unit drives the internal high-frequency pulse metering pump to start operation. The high-frequency pulse metering pump reads the target mass of the active corrosion inhibitor stored in the control calculation unit and injects pure active corrosion inhibitor into the fluid inside the main circulation network. The physical quantity of the injected pure active corrosion inhibitor is equal to the target mass of the active corrosion inhibitor.

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