Intelligent online chemical instrument commissioning prediction system and use method thereof

Abstract

The invention discloses an intelligent online chemical instrument commissioning prediction system and a use method thereof. The system comprises an online chemical instrument, a control unit, a light source, a measuring cell, a transmission light detector and a scattered light detector. Light emitted by the light source serves as incident light, is transmitted to the measuring cell and forms transmission light and scattered light after passing through the measuring cell; the transmission light detector is used for receiving the transmission light and outputting transmission absorbance, and the scattered light detector is used for receiving the scattered light and outputting turbidity; the transmission light detector, the scattered light detector and the online chemical instrument are all communicated with the control unit; and the control unit is used for controlling whether the online chemical instrument is put into operation or not according to the transmission absorbance and the turbidity. According to the system, by introducing objective quantitative indexes, automatic control, continuous monitoring and dynamic adjustment are realized, and the technical problems of inconsistent judgment and incapability of realizing automatic commissioning caused by judging the commissioning opportunity of the online chemical instrument depending on artificial experience in the prior art are effectively solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of chemical supervision of thermal power plants, and relates to an intelligent online chemical instrument commissioning prediction system and a method thereof. BACKGROUND

[0002] With the adjustment of energy structure, thermal power generating units have gradually changed from main power source to peak regulation power source, and participating in deep peak regulation or frequent start-stop has become the norm. According to statistics, the annual average start-stop times of some peak regulation units have reached dozens of times. However, the severe change of unit operation conditions brings severe challenges to the thermal system, especially the water vapor circulation system: in the process of frequent start-stop, the corrosion products on the internal metal surface of the boiler, steam turbine and other equipment are stripped due to the sharp temperature fluctuation, and combined with the local concentration of residual water in the system during shutdown, the content of iron, copper and other metal oxides and silicate impurities presents non-steady-state fluctuation. After these corrosion products migrate to the steam-water system with the water vapor medium, they may cause salt accumulation on the turbine blade, boiler heating surface fouling and other safety hazards, which directly threatens the safety and economy of the unit operation.

[0003] Under this background, the online water vapor quality monitoring system as the core means of chemical supervision of thermal power generating units, the scientificity of its operation strategy directly affects the safety control of the start-stop process of the unit. The currently widely used online chemical instruments such as iron meter, sodium meter, silicon meter, chlorine meter and dissolved oxygen meter provide key basis for water quality control for operating personnel by monitoring the concentration change of specific ions in real time. However, it is worth noting that the water quality parameters at the start-up stage of the unit have significant time-varying characteristics: at the initial stage of start-up, the residual corrosion products in the system are washed and dissolved and diffused, at this time the concentration of suspended particulate matter in the water sample can instantaneously reach dozens of times of the normal operation value, and the particle size distribution presents a multi-peak characteristic. If the online instrument is put into operation too early at this stage, the high concentration of corrosion products is easy to adhere and deposit inside the instrument flow path, causing irreversible damage such as flow cell blockage and electrode surface passivation. On the contrary, if the instrument commissioning time is delayed, the key window period of water quality deterioration may be missed.

[0004] At present, the commissioning time decision of online chemical instruments in the industry still highly depends on the experience judgment of operating personnel, and generally uses fixed time nodes or simple water quality thresholds as the basis for start-stop. This extensive management method has significant limitations: first, the water vapor system volume, material characteristics and start-stop mode of different units are significantly different, and the experience transplantability is poor. Second, manual judgment is greatly affected by subjective factors, and even different operating personnel choose different instrument commissioning times under the same working conditions, and this operation dispersion makes the water quality parameters out of control during the start-up process of the unit. More importantly, the traditional method lacks the quantitative analysis ability of the dynamic change characteristics of water quality parameters, and cannot establish the correlation model between corrosion product migration, instrument pollution risk and monitoring data effectiveness, making it difficult to achieve precise process control.

[0005] This current state of technology is no longer adaptable to the stringent peak-shaving performance requirements of new power systems for thermal power units. In deep peak-shaving scenarios, units may need to complete a start-stop cycle within 24 hours. Traditional manual decision-making models cannot accurately guarantee the timing of instrument commissioning, nor can they achieve closed-loop optimization control throughout the entire process. Therefore, establishing an intelligent commissioning system for online chemical instruments based on the dynamic characteristics of water quality parameters, overcoming technical bottlenecks such as strong reliance on manual experience, poor decision-making consistency, and uncontrollable processes, has become a key technical challenge in improving the flexible peak-shaving capabilities of thermal power units and is of great strategic significance for ensuring the safe and economic operation of new power systems. Summary of the Invention In response to the problems existing in the prior art, the present invention provides an intelligent online chemical instrument commissioning prediction system and its use method, thereby solving the technical problems that the prior art relies on manual experience to judge the timing of commissioning of online chemical instruments, resulting in inconsistent judgments and inability to achieve automated commissioning.

[0006] The present invention is achieved through the following technical solutions: An intelligent online chemical instrument commissioning prediction system includes an online chemical instrument, a control unit, a light source, a measuring cell, a transmitted light detector, and a scattered light detector; The light emitted by the light source is used as incident light, propagates to the measuring cell, and forms transmitted light and scattered light after passing through the measuring cell; the transmitted light detector is used to receive the transmitted light and output the transmitted absorbance, and the scattered light detector is used to receive the scattered light and output the turbidity; The transmitted light detector, scattered light detector and online chemical instrument are all in communication with the control unit; The control unit is used to control whether to put the online chemical instrument into operation according to the transmission absorbance and turbidity.

[0007] Preferably, the online chemical instrument system capable of realizing intelligent operation includes a first electric valve and a second electric valve; the first electric valve is arranged at the sample inlet of the measuring cell, and the second electric valve is arranged at the sample inlet of the online chemical instrument.

[0008] Preferably, a water sample filter is further connected between the second electric valve and the online chemical instrument.

[0009] Preferably, the online chemical instrument system capable of realizing intelligent operation further comprises a flow sensor, the output end of the flow sensor being connected to the input end of the first electric valve and the second electric valve respectively; the flow sensor communicates with the control unit.

[0010] Preferably, the inlet end of the measuring cell is further provided with a third electric valve, which is connected with the control unit.

[0011] Preferably, the wavelength range of the light source is the visible light range.

[0012] Preferably, the transmission light detector is a photodiode or a spectrometer, and the scattering light detector is a photodiode or a spectrometer.

[0013] Preferably, the water quality parameters of the online chemical instrument include at least one of iron content, copper content, silicon dioxide content, sodium content, chlorine content, conductivity, pH value and dissolved oxygen content.

[0014] The use method of the intelligent online chemical instrument commissioning prediction system is as follows: S1: make the water sample to be measured enter the measuring cell, turn on the light source, and determine the maximum absorption wavelength of the current water sample to be measured through the transmission light detector; S2: fix the absorption wavelength of the transmission light detector as the maximum absorption wavelength, determine the transmission absorbance of the water sample to be measured through the transmission light detector, and determine the turbidity of the water sample to be measured through the scattering light detector; when the transmission absorbance is less than a first threshold value and the turbidity is less than a second threshold value, turn on the online chemical instrument to perform online supervision on the quality of the water sample to be measured.

[0015] Preferably, when the first threshold value is 0.3 and the second threshold value is 10 NTU, at least one of the conductivity meter and the pH meter is commissioned; when the first threshold value is 0.03 and the second threshold value is 0.4 NTU, at least one of the iron meter, the copper meter, the silicon meter, the sodium meter and the dissolved oxygen meter is commissioned.

[0016] Compared with the prior art, the present application has the following beneficial technical effects: The application provides an intelligent online chemical instrument operation prediction system. The system uses the transmitted light and scattered light generated by the light emitted by a light source after passing through a measuring pool, which are received by a transmitted light detector and a scattered light detector respectively, and outputs two objective physical quantities, namely transmitted absorbance and turbidity. The transmitted absorbance reflects the degree of light absorption of the water sample, and the turbidity reflects the light scattering situation of the suspended particles in the water sample. The two parameters can be accurately measured and quantified by the instrument, and compared with manual experience judgment, have clear numerical value and repeatability, and avoid the subjectivity and uncertainty of manual judgment. The control unit judges whether to operate the online chemical instrument according to the preset algorithm and threshold value based on the two objective indexes, namely transmitted absorbance and turbidity. The judgment standard based on the objective parameters is unified and fixed, and will not be different due to the experience difference of different operators, so as to ensure the consistency of the judgment. In addition, the transmitted light detector, the scattered light detector and the online chemical instrument are in communication with the control unit, and can transmit the measured transmitted absorbance, turbidity and water quality parameters monitored by the online chemical instrument to the control unit in real time. This enables the control unit to obtain the latest water quality information in time, and provides a basis for subsequent decision-making. After receiving the real-time data, the control unit automatically analyzes and processes according to the preset algorithm and threshold value. When the transmitted absorbance and turbidity meet the preset conditions, the control unit will automatically issue an instruction to control the operation of the online chemical instrument; otherwise, if the conditions are not met, the online chemical instrument will not be operated or an appropriate alarm signal will be issued. The whole process does not need manual intervention, realizes the automation and intelligence of the operation of the online chemical instrument, greatly improves the work efficiency and accuracy; in addition, the system continuously measures the transmitted absorbance and turbidity of the water sample, can monitor the change of the water quality in real time, once the water quality parameter changes, the control unit can obtain new data in time, and rejudge whether to operate the online chemical instrument according to the latest data, so as to ensure that the online chemical instrument always runs under appropriate water quality conditions. In summary, the intelligent online chemical instrument operation system introduces objective quantitative indicators, realizes automatic control, and continuously monitors and dynamically adjusts, effectively solves the technical problems of inconsistent judgment and inability to realize automatic operation of the existing technology which depends on manual experience to judge the operation time of the online chemical instrument.

[0017] Further, the online chemical instrument system capable of intelligent operation includes a first electric valve and a second electric valve; the first electric valve is arranged at the sample inlet of the measuring pool, and the second electric valve is arranged at the sample inlet of the online chemical instrument; the first electric valve and the second electric valve are arranged to control the water sample flow and timing into the measuring pool and the online chemical instrument respectively; through the accurate control of the electric valves, the rhythm of the water sample entering can be flexibly adjusted according to actual needs, and the influence of too much or too little water sample on the measurement and the operation of the instrument is avoided. For example, during the system starting or cleaning stage, the electric valves can be closed to prevent the water sample from entering; during the normal measurement stage, the water sample flow is accurately controlled according to the instruction of the control unit, so that the accuracy of measurement and the stable operation of the online chemical instrument are ensured, and the automation degree and the reliability of the system are improved.

[0018] Further, the second electric valve and the online chemical instrument are further connected with a water sample filter, the water sample filter can pretreat the water sample entering the online chemical instrument; the water sample may contain large-particle impurities, suspended matters and the like, these impurities may block the measuring channel of the online chemical instrument, damage the measuring components or affect the accuracy of the measurement result; the water sample filter can effectively remove these impurities, protect the online chemical instrument, prolong the service life of the online chemical instrument, improve the accuracy of the water quality parameter measurement, and ensure that the online chemical instrument can accurately and stably operate.

[0019] Further, the online chemical instrument system capable of intelligent operation further includes a flow sensor, the output end of the flow sensor is connected with the input end of the first electric valve and the second electric valve respectively; the flow sensor communicates with the control unit; the flow sensor monitors the water sample flow in real time and feeds back the output signal to the first electric valve and the second electric valve respectively; the control unit can automatically adjust the opening degree of the electric valves according to the feedback signal of the flow sensor, so that the water sample flow into the measuring pool and the online chemical instrument is accurately controlled.

[0020] Further, the inlet end of the measuring pool is further provided with a third electric valve, the third electric valve is connected with the control unit, so that the measuring pool can be conveniently cleaned; after the measurement is completed or the measuring water sample needs to be replaced, the control unit can control the third electric valve to be opened, introduce water of a required quality to clean the measuring pool, prevent the residual water sample from interfering with the subsequent measurement, ensure the cleanliness of the measuring pool, improve the accuracy and reliability of the measurement result, prolong the service life of the measuring pool and reduce the maintenance cost.

[0021] Further, the wavelength range of the light source is 400-750nm, which covers the visible light region and can meet the needs of measuring various water quality parameters. Different water quality parameters have different absorption and scattering characteristics of light at different wavelengths. The wavelength range of 400-750nm can provide rich spectral information, so that the transmission light detector and the scattering light detector can more accurately measure the transmission absorbance and turbidity and other parameters, thereby improving the accuracy of the system in judging the water quality.

[0022] Further, the transmission light detector is a photodiode or a spectrometer, and the scattering light detector is a photodiode or a spectrometer. The photodiode can quickly convert the light signal into an electrical signal to realize real-time monitoring of the transmitted light and scattered light. The spectrometer can accurately analyze the wavelength and intensity distribution of the light to provide more accurate data support for measurement. By reasonably selecting the detector, the performance of the system can be optimized, and the accuracy and reliability of the measurement results can be improved.

[0023] Further, the water quality parameters of the online chemical instrument include at least one of suspended particulate matter concentration, particle size distribution, iron ion concentration, copper ion concentration, and silicate concentration, which meets the diversified needs of different users for water quality monitoring. Users can select the corresponding water quality parameters for monitoring according to the actual monitoring target and focus. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0025] Figure 1 The structure diagram of an intelligent online chemical instrument commissioning prediction system in the present application; Figure 2 The structure diagram of a commissioning prediction device in the present application; Figure 3 The flowchart of a use method of an intelligent online chemical instrument commissioning prediction system in the present application. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the application claimed, but merely represents selected embodiments of the application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the application without creative labor fall within the scope of the application.

[0028] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0029] In the description of the embodiments of the application, it should be noted that if the terms "upper", "lower", "horizontal", "inner" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the application is usually placed, which is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first", "second" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0030] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0031] In the description of the embodiments of the application, it should also be noted that unless otherwise explicitly specified and limited, if the terms "set", "mount", "connected", "connected" appear, they should be understood in a broad sense, for example, they can be fixedly connected, or detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium; can be the communication between the two elements inside. For those of ordinary skill in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0032] The application will be described in further detail below in conjunction with the accompanying drawings: Example 1 The shutdown corrosion occurs during the shutdown of the unit of the thermal power plant, and the corrosion product formed is generally the yellowish-brown rust (triiron tetroxide and diiron trioxide) which is easy to be washed away, that is, when the unit is started and washed, the water vapor sample contains the corrosion product in the dissolved state and the particle state, and when the concentration is too high, even the iron table for detecting the iron content in the water vapor sample is extremely easy to be contaminated, and it is difficult to restore normal supervision in a short time. According to the characteristics that the impurities in the water sample are the colored solution containing particle impurities, the influence of the water sample on the energy absorption of light and the dispersion of light is realized to evaluate the pollution degree of the water sample. The basic principle is based on the quantitative relationship between the optical characteristics and the impurity concentration in the solution, and specifically includes the following two aspects: 1. Light energy absorption principle When a beam of light passes through a colored solution containing particle impurities, the impurities (such as corrosion products, suspended particles, organic matter, etc.) in the solution will absorb light energy of a specific wavelength, resulting in a decrease in the intensity of transmitted light. According to the Lambert-Beer Law, the intensity of transmitted light is exponentially related to the concentration of impurities in the solution. By measuring the degree of weakening of the transmitted light intensity, the concentration of impurities in the solution can be indirectly calculated, thereby evaluating the pollution degree of the water sample.

[0033] 2. Light dispersion principle When light passes through a solution containing particle impurities, the particles will scatter light, resulting in light dispersion. The degree of dispersion is closely related to the particle size, concentration, and wavelength of light. According to the Mie Scattering Theory, the scattering intensity of particles to light is proportional to the sixth power of their particle size. Therefore, the more particle impurities and the larger the particle size in the solution, the more obvious the light dispersion phenomenon.

[0034] By measuring the intensity of scattered light, the concentration and particle size distribution of particle impurities in the solution can be further analyzed, thereby more comprehensively evaluating the pollution degree of the water sample. The turbidity of the solution is proportional to the intensity of scattered light, so the content of impurities in the solution can be represented by the turbidity.

[0035] Based on the above principles, as shown in Figure 1 The present application discloses an online chemical instrument prediction device before operation, which comprises an operation prediction device, an online chemical instrument and a control unit.

[0036] as shown in Figure 2As shown, the operation prediction device includes a light source, a measuring pool, a transmitted light detector, and a scattered light detector; the light emitted by the light source serves as incident light, propagates to the measuring pool, and forms transmitted light and scattered light after passing through the measuring pool; the transmitted light detector is used to receive the transmitted light and output transmitted absorbance, and the scattered light detector is used to receive the scattered light and output turbidity; the transmitted light detector, the scattered light detector, and the online chemical instrument are all in communication with the control unit; the control unit is used to control whether to operate the online chemical instrument according to the transmitted absorbance and the turbidity.

[0037] For the operation prediction device, the light source is used to emit light of a specific wavelength range (400-750 nm) as incident light, and the wavelength range can be optimized and adjusted according to actual needs to adapt to the measurement needs of different water quality parameters. The light source can use high-stability and long-life LED or laser to ensure the accuracy and reliability of the measurement results.

[0038] The measuring pool is the place where light and water sample interact, and the material of the measuring pool is preferably quartz glass to reduce the absorption and scattering of light and reduce measurement errors. In a preferred embodiment, the inlet end of the measuring pool is provided with a third electric valve connected to the control unit for cleaning the measuring pool to prevent residual water samples from interfering with subsequent measurements.

[0039] The transmitted light detector, i.e. the light detector 2 in Figure 1 , is used to receive the transmitted light after the measuring pool and convert it into an electrical signal to output the transmitted absorbance. The transmitted light detector can use a high-sensitivity, low-noise photodiode or spectrometer, and the appropriate detector type and parameters are selected according to actual measurement needs.

[0040] The scattered light detector, i.e. the light detector 1 in Figure 1 , is used to receive the scattered light after the measuring pool and convert it into an electrical signal to output the turbidity. The scattered light detector can also use a photodiode or a spectrometer, and the scattered light detector is arranged at a vertical position on the light path to improve the reception efficiency of the scattered light.

[0041] The online chemical instrument is used to monitor water quality parameters in real time, and the water quality parameters include at least one of suspended particulate matter concentration, particle size distribution, iron ion concentration, copper ion concentration, and silicate concentration. The online chemical instrument should have the characteristics of high precision, high stability, and fast response to meet the actual needs of water quality monitoring.

[0042] The control unit, the core control component of the entire system, communicates with the transmitted light detector, scattered light detector, and online chemical meter. Based on the received transmitted absorbance and turbidity data, combined with pre-set algorithms and thresholds, the control unit determines whether the current water sample is suitable for operation with the online chemical meter. If the sample parameters meet the requirements, the control unit issues a command to open the second electric valve, allowing the sample to enter the online chemical meter for further monitoring. If the sample parameters do not meet the requirements, the control unit issues an alarm signal, prompting the operator to take appropriate action.

[0043] In addition, a first electric valve is provided at the sample inlet of the measuring cell, namely Figure 1 The electric valve 1 in the measuring tank is used to control the flow rate and timing of the water sample entering the measuring tank. The opening of the first electric valve can be automatically adjusted according to the feedback signal of the flow sensor to ensure the stability of the water sample flow in the measuring tank. Figure 1 The electric valve 2 is set at the inlet of the online chemical instrument to control the flow rate and timing of the water sample entering the online chemical instrument. The opening of the second electric valve can also be automatically adjusted according to the feedback signal of the flow sensor to ensure the stability of the inlet flow of the online chemical instrument. Figure 1 Electric valve 3, located at the inlet of the measuring cell and connected to the control unit, is used to clean the measuring cell. After a measurement is completed or when the water sample needs to be replaced, the control unit controls the third electric valve to open, introducing cleaning fluid to clean the measuring cell and prevent residual water from interfering with subsequent measurements.

[0044] In a preferred embodiment, a water sample filter is connected between the second electric valve and the online chemical meter to pre-treat the water sample entering the online chemical meter, removing large particles and suspended matter to prevent damage to the meter's measuring components or affect the accuracy of measurement results. The filtration accuracy of the water sample filter can be selected based on actual needs, generally ranging from a few microns to tens of microns.

[0045] Further preferably, the online chemical instrument system capable of intelligent operation further includes a flow sensor, the output end of which is connected to the input end of the first electric valve and the second electric valve, respectively; the flow sensor communicates with the control unit. The flow sensor is used to monitor the flow rate of the water sample in real time and feed the flow signal back to the control unit. The control unit automatically adjusts the opening of the first electric valve and the second electric valve based on the feedback signal from the flow sensor to ensure stable sample flow in the measuring cell and the online chemical instrument. The flow sensor can be a high-precision, high-reliability electromagnetic flowmeter or turbine flowmeter to meet actual measurement requirements.

[0046] The present invention proposes an intelligent online chemical instrument commissioning prediction system. The system uses an optical path sensing system to detect the visible light dispersion and light intensity reduction of the water sample after passing through the measuring cell, and intelligently determines the commissioning time of the online chemical instrument, thereby achieving fast, accurate and reliable online chemical instrument commissioning, effectively avoiding instrument contamination, and ensuring the accuracy and reliability of chemical supervision. The optical path sensing system monitors the degree of contamination of the water sample in real time and intelligently determines the commissioning time of the online chemical instrument without manual intervention, thereby improving commissioning efficiency and accuracy. The system effectively identifies impurities in the water sample, avoids instrument contamination caused by premature commissioning, extends the service life of the instrument, and ensures that the online chemical instrument is commissioned at the optimal time, obtains accurate and reliable monitoring data, and provides guarantees for the safe and stable operation of the unit. The online chemical instrument system that can realize intelligent commissioning in the present invention is suitable for various types of thermal power generating units, meeting the needs of deep peak regulation and frequent start and stop.

[0047] Example 2 In addition, if Figure 3 As shown, the present invention also discloses a method for using the above-mentioned intelligent online chemical instrument commissioning prediction system, which includes the following steps: S1: Place the water sample to be tested into the measuring cell, turn on the light source, and determine the maximum absorption wavelength of the current water sample to be tested through the transmitted light detector; S2: Fix the absorption wavelength of the transmitted light detector to the maximum absorption wavelength, determine the transmitted absorbance of the water sample to be tested by the transmitted light detector, and determine the turbidity of the water sample to be tested by the scattered light detector; when the transmitted absorbance is less than a first threshold value and the turbidity is less than a second threshold value, turn on the online chemical instrument to perform online monitoring of the quality of the water sample to be tested.

[0048] In a specific embodiment, when the first threshold value is 0.3 and the second threshold value is 10NTU, at least one of a conductivity meter and a pH meter is put into operation; when the first threshold value is 0.03 and the second threshold value is 0.4NTU, at least one of an iron meter, a copper meter, a silicon meter, a sodium meter and a dissolved oxygen meter is put into operation.

[0049] In addition, when the transmission absorbance is less than the first threshold and the turbidity is less than the second threshold, the third electric valve is opened, the first electric valve is closed, and the measuring pool in the commissioning prediction device is backwashed for at least 10 minutes to avoid contamination.

[0050] Example 3 In order to further explain the technical solution of the present invention, it is described through the following examples: A method for using an intelligent online chemical instrument commissioning prediction system includes the following steps: Preparation stage System initialization, control unit for each component self-checking, to ensure normal operation.

[0051] Open the third electric valve, introduce cleaning fluid to measure the pool cleaning, cleaning is completed after the third electric valve.

[0052] Measurement phase The fourth electric valve, namely Figure 1 The electric valve 4 in the open state (unit shutdown for closed state), when the flow probe detects the water flow. Open the first electric valve, close the fourth electric valve, so that the water sample into the measuring pool.

[0053] Light source emits incident light, after the measuring pool to form the transmission and scattering light.

[0054] Transmission detector and scattering light detector respectively receive transmission and scattering light, and convert it into electrical signal output transmission absorbance and turbidity.

[0055] Control unit receives transmission absorbance and turbidity data, combined with the preset algorithm and threshold, to determine whether the current water sample is suitable for the operation of online chemical instrument.

[0056] Operation phase If the water sample parameters meet the requirements, the control unit opens the second electric valve, so that the water sample into the online chemical instrument for further monitoring.

[0057] Online chemical instrument prediction device real-time monitoring of water sample through light absorbance and scattering light intensity (in the form of turbidity display), and the monitoring results feedback to the control unit.

[0058] Control unit for analysis and processing of monitoring results, according to the need to issue corresponding control instructions or alarm signals.

[0059] End phase After the measurement, close the first electric valve and the second electric valve.

[0060] Open the third electric valve, introduce cleaning fluid to measure the pool cleaning, for the next measurement ready.

[0061] The present application realizes accurate prediction of the online chemical instrument before operation by measuring the transmission absorbance and turbidity, combining preset algorithms and threshold values, avoids damage to the online chemical instrument or influence on the accuracy of the measurement results due to the water sample parameters not meeting the requirements. The automatic adjustment of the water sample flow is realized by using the electric valve and the flow sensor, the intelligent control of each component is realized by the control unit, the automation degree and the operation efficiency of the system are improved. In addition, the water sample filter is arranged to pretreat the water sample entering the online chemical instrument, remove the large particle impurities and suspended solids in the water sample, prolong the service life of the online chemical instrument, and improve the accuracy of the measurement results. Meanwhile, the system can flexibly configure different water quality parameter monitoring modules according to actual needs, realizes real-time monitoring of various water quality parameters, and meets the needs of different users.

[0062] The prediction device of the online chemical instrument before operation and the online chemical instrument system capable of realizing intelligent operation of the present application have wide application prospects, can be widely applied to water quality monitoring in the fields of electric power, chemical industry, environmental protection and water treatment, and provide strong technical support for production operation and environmental protection of enterprises by improving the accuracy and efficiency of water quality monitoring.

[0063] The above is only the preferred embodiment of the present application and is not used to limit the present application. The present application can have various changes and variations for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An intelligent online chemical instrument commissioning prediction system, characterized in that: It includes an online chemical meter, a control unit, a light source, a measuring cell, a transmitted light detector and a scattered light detector; The light emitted by the light source is used as incident light, propagates to the measuring cell, and forms transmitted light and scattered light after passing through the measuring cell; the transmitted light detector is used to receive the transmitted light and output the transmitted absorbance, and the scattered light detector is used to receive the scattered light and output the turbidity; The transmitted light detector, scattered light detector and online chemical instrument are all in communication with the control unit; The control unit is used to control whether to put the online chemical instrument into operation according to the transmission absorbance and turbidity.

2. The intelligent online chemical instrument commissioning prediction system according to claim 1 is characterized in that: The online chemical instrument system capable of realizing intelligent operation includes a first electric valve and a second electric valve; the first electric valve is arranged at the sample inlet of the measuring cell, and the second electric valve is arranged at the sample inlet of the online chemical instrument.

3. The intelligent online chemical instrument commissioning prediction system according to claim 2 is characterized in that: A water sample filter is also connected between the second electric valve and the online chemical instrument.

4. The intelligent online chemical instrument commissioning prediction system according to claim 2 is characterized in that: The online chemical instrument system capable of realizing intelligent operation further includes a flow sensor, the output end of which is respectively connected to the input end of the first electric valve and the second electric valve; the flow sensor communicates with the control unit.

5. The intelligent online chemical instrument commissioning prediction system according to claim 1 is characterized in that: A third electric valve is further provided at the inlet end of the measuring cell, and the third electric valve is connected to the control unit.

6. The intelligent online chemical instrument commissioning prediction system according to claim 1 is characterized in that: The wavelength range of the light source is the visible light range.

7. The intelligent online chemical instrument commissioning prediction system according to claim 1 is characterized in that: The transmitted light detector is a photodiode or a spectrometer, and the scattered light detector is a photodiode or a spectrometer.

8. The intelligent online chemical instrument commissioning prediction system according to claim 1 is characterized in that: The water quality parameter of the online chemical instrument includes at least one of iron content, copper content, silica content, sodium content, chlorine content, conductivity, pH value and dissolved oxygen content.

9. A method for using the intelligent online chemical instrument commissioning prediction system according to claims 1 to 8, characterized in that: The following steps are involved: S1: Place the water sample to be tested into the measuring cell, turn on the light source, and determine the maximum absorption wavelength of the current water sample to be tested through the transmitted light detector; S2: Fix the absorption wavelength of the transmitted light detector to the maximum absorption wavelength, determine the transmitted absorbance of the water sample to be tested by the transmitted light detector, and determine the turbidity of the water sample to be tested by the scattered light detector; when the transmitted absorbance is less than a first threshold value and the turbidity is less than a second threshold value, turn on the online chemical instrument to perform online monitoring of the quality of the water sample to be tested.

10. The method for using the intelligent online chemical instrument commissioning prediction system according to claim 9, characterized in that: When the first threshold is 0.3 and the second threshold is 10NTU, at least one of the conductivity meter and the pH meter is put into operation; when the first threshold is 0.03 and the second threshold is 0.4NTU, at least one of the iron meter, copper meter, silicon meter, sodium meter and dissolved oxygen meter is put into operation.

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