CN111422930A - Intelligent chemical agent adding control system and control method - Google Patents
Intelligent chemical agent adding control system and control method Download PDFInfo
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- CN111422930A CN111422930A CN202010269346.7A CN202010269346A CN111422930A CN 111422930 A CN111422930 A CN 111422930A CN 202010269346 A CN202010269346 A CN 202010269346A CN 111422930 A CN111422930 A CN 111422930A
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Abstract
The invention discloses a chemical agent intelligent dosing control system and a control method, comprising an online monitoring instrument, a chemical agent intelligent controller and a dosing execution unit; the online monitoring instrument is respectively arranged at the water inlet end and the water outlet end of the pollutant removal reaction tank and transmits the collected pollutant concentration information of the water inlet end and the water outlet end to the chemical agent intelligent controller; the chemical agent intelligent controller analyzes according to the historical operating data of the pollutant concentration information and establishes a mathematical control model which takes the chemical agent adding amount as output, the chemical agent adding amount is estimated in real time, the adding amount signal is converted into the adding frequency and then transmitted to the adding agent execution unit, and the automatic adding of the chemical agent is realized. The accurate and automatic addition of the chemical agent is realized.
Description
Technical Field
The invention belongs to the technical field of intelligent control equipment for water treatment, and particularly relates to an intelligent chemical agent adding control system.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
With the increasing shortage of water resources and water pollution problems in China, the water treatment tasks of urban water supply and wastewater treatment plants face more severe tests, and the water supply and wastewater treatment becomes one of the important guarantees for residents to obtain high-quality drinking water sources. Water quality indexes such as nitrogen, phosphorus pollutants, turbidity, COD and the like in the feed water and the wastewater are important control objects in the water treatment process, the thorough removal of the pollutants is difficult to reach the discharge standard only by means of biological means, and the discharge reaching the standard can be realized only by adding chemical agents for auxiliary treatment.
The inventor discovers in research that at present, the adding of chemical agents in the water supply and wastewater treatment process mainly depends on manual regulation and control of operators, the regulation mode is rough, and the phenomenon of agent waste is serious; meanwhile, the water quality and the water quantity of the inlet water have large fluctuation, so that manual adjustment is too frequent, the complexity of operation management is increased, and the personnel cost is increased.
In addition, the intelligent control system used in the process of water supply and wastewater treatment at the present stage is simple, the communication mode is single, no clear communication standard exists, and the problems of poor signal communication mode compatibility, no off-plant ultra-remote control function, complex circuit structure, large size, inconvenient installation and transportation, single type of control agent and the like exist in different control products.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an intelligent chemical dosing control system which can be compatible with various signal communication modes.
In order to achieve the above object, one or more embodiments of the present invention provide the following technical solutions:
a chemical agent intelligent dosing control system comprises:
the system comprises an online monitoring instrument, a chemical agent intelligent controller and a dosing execution unit;
the online monitoring instrument is respectively arranged at the water inlet end and the water outlet end of the pollutant removal reaction tank and transmits the collected pollutant concentration information of the water inlet end and the water outlet end to the chemical agent intelligent controller;
the chemical agent intelligent controller analyzes according to the historical operating data of the pollutant concentration information and establishes a mathematical control model which takes the chemical agent adding amount as output, the chemical agent adding amount is estimated in real time, the adding amount signal is converted into the adding frequency and then transmitted to the adding agent execution unit, and the automatic adding of the chemical agent is realized.
According to the further technical scheme, the on-line monitoring instrument at the water outlet end feeds back the treatment result of the added chemical agent to the chemical agent intelligent controller in real time, the chemical agent intelligent controller judges whether the adding of the chemical agent meets the requirement or not according to the set water outlet index range, and if the adding of the chemical agent does not meet the control requirement, the budget result needs to be subjected to proportion correction.
An intelligent chemical agent adding control method comprises the following steps:
analyzing according to the historical operating data of the pollutant concentration information, establishing a mathematical control model with the chemical agent addition amount as output, pre-calculating the chemical agent addition amount in real time, and automatically adding the chemical agent;
collecting pollutant concentration information of a water outlet end of a pollutant removal reaction tank, feeding back a treatment result after chemical agents are added in real time, judging whether the chemical agents meet the requirement or not according to a set water outlet index range, and if the chemical agents do not meet the control requirement, performing proportion correction on a budget result until the budget result is within the set range.
In a further technical scheme, the specific logic rule of the proportion correction is as follows:
setting the effluent execution standard to NstandSetting 4 critical values as minimum value N for water outlet in daily operationLLLower value NLHigher value of NHMaximum value NHHThe specific relationship is NLL＜NL＜NH＜NHH＜Nstand；
When the COD/TP/turbidity of the effluent or other pollutant control index chi is in the interval [ N ]L,NH]When the processing result is normal, the processing result is normal and correction is not needed;
when the control index χ is in the interval (N)H，NHH) In the time, the chemical agent adding result is slightly low, the adding amount needs to be increased to remove more pollutants, and a correction coefficient k needs to be multiplied at the timeH，kH＞1；
When the control index χ is in the interval [ NHH，Nstand) When the chemical dosage is too low, the correction factor k is multiplied by a larger valueHH，kHH＞kH＞1；
When the control index χ is in the interval (N)LL,NL) It indicates that the dosage of the chemical agent is slightly higher, and the dosage needs to be reduced, and then the dosage needs to be multiplied by a correction coefficient kL，kL＜1；
When the control index χ is less than or equal to NLLWhen the dosage of the chemical agent is too high, the chemical agent needs to be multiplied by a larger correction coefficient kLL，kLL＜kLLess than 1, the dosage is automatically reduced, and the medicament consumption is saved.
In a further technical scheme, the set N, 4 critical values and 4 correction coefficients are set and assigned according to historical operating data and intelligent control system control data.
The above one or more technical solutions have the following beneficial effects:
according to the technical scheme, the chemical agent adding amount is analyzed according to the historical operating data of the pollutant concentration information, a mathematical control model which takes the chemical agent adding amount as output is established, the chemical agent adding amount is pre-calculated in real time, the chemical agent is automatically added, and the chemical agent is accurately and automatically added.
According to the technical scheme, the treatment result after chemical agent addition is fed back in real time according to the pollutant concentration information of the water outlet end of the pollutant removal reaction tank, whether the chemical agent addition meets the requirement or not is judged according to the set water outlet index range, if the chemical agent addition does not meet the control requirement, the proportion correction is needed to be carried out on the budget result until the chemical agent addition is controlled in the set range in real time in a correction mode, the chemical agent addition is ensured to meet the actual requirement, and the purpose of saving the chemical agent consumption is achieved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic control flow diagram of an intelligent control system for water supply and wastewater treatment chemicals;
FIG. 2 is a circuit diagram of the internal components of the intelligent chemical agent device for water supply and wastewater treatment;
FIG. 3 correction coefficient K of intelligent control system for water supply and wastewater treatment chemicalsfactorAnd (5) a variation graph.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
Example one
The embodiment discloses a chemical agent intelligent dosing control system, which is shown in attached figures 1 and 2 and comprises an online monitoring instrument, a chemical agent intelligent controller and a dosing execution unit, wherein the chemical agent intelligent controller mainly comprises an analog signal input/output terminal, an input/output signal integrated terminal, a network adapter IO integrated card and a P L C touch controller.
FIG. 1 is a schematic diagram of the control flow of an intelligent control system for chemical agents in water supply and wastewater treatment, wherein an online monitoring instrument collects water quality information such as the amount of treated water, total phosphorus (P), turbidity, COD, pH, conductivity and reaction temperature in real time and transmits the water quality signals to an intelligent chemical agent controller which is based on the intelligent chemical agent controllerAnd analyzing according to historical operating data, establishing a mathematical control model with the chemical agent dosage as output, and budgeting the chemical agent dosage at the moment. Taking the example of adding coagulant to remove total phosphorus, the reaction process of coagulant and phosphorus is also subject to other water quality indexes: the coagulant adding amount is increased due to the influence of pH, suspended matter SS, water quantity Q, conductivity D, reaction temperature T and the like, and the aim of accurately adding the coagulant cannot be achieved by singly establishing a curve relation between the total phosphorus removal amount and the coagulant adding amount, so that a mathematical model or a composite relation graph which takes the variables as input amounts and the coagulant adding amount as output amounts can be established according to the variables of total phosphorus, pH, SS, Q, D, T and the like in the prior operation and the historical data of the coagulant adding amount to adjust the coagulant adding amount in the total phosphorus removal process. Thus, the dose of drug UdosThe specific expression of the model is as follows:
Ud∞＝β0+β1·Q+β2·SS+β3·P+β4·pH1+β5·D+β6·Q·SS+β7·Q·P+β0·T
the model parameters are determined by multiple parameter regression analysis according to β according to the monitoring data of the water quality index monitoring instrument used in the formula, the water quality index data actually adopted in the model, and the cross multiplication term (such as Q.SS) of the water quality index and the high power of the water quality index are determined according to the model analysis of specific items.
The dosing quantity signal is converted into dosing frequency and then transmitted to a variable-frequency dosing pump of a dosing execution unit, so that the chemical agent is automatically dosed.
The system of the invention has more types of chemical agents, compared with the existing control system which can only control a single type of chemical agent, the control logic of the invention is universally suitable for various liquid chemical agents in the process of water supply and wastewater treatment, can control different types of chemical agents simultaneously, and the control models are respectively and independently established according to the historical adding data of different agents. The hardware equipment of the control system designed by the invention can be simultaneously embedded with two or more sets of control models, and one, two or more medicaments can be simultaneously controlled to be simultaneously added according to different process requirements. Medicine ofAgent classes include, but are not limited to FeCl3、AlCl3、Fe2(SO4)3、Al2(SO4)3Various coagulants, flocculants and coagulant aids such as polyaluminium chloride (PAC), polyferric sulfate (PFS), polyferric chloride (PFC), polyaluminium ferric chloride, anionic Polyacrylamide (PAM) and the like, and the application range of the flocculant and the coagulant aid is wider.
And the water outlet end on-line monitoring instrument feeds back a treatment result after chemical agent addition to the chemical agent intelligent controller in real time, the chemical agent intelligent controller judges whether the chemical agent addition meets the requirement or not according to a water outlet index range set manually, and if the chemical agent addition does not meet the control requirement, the budget result needs to be subjected to proportion correction. The specific logic rule is as follows: setting the effluent execution standard to NstandSetting 4 critical values as minimum value N for water outlet in daily operationLLLower value NLHigher value of NHMaximum value NHHThe specific relationship is NLL＜NL＜NH＜NHH＜Nstand. When the COD/TP/turbidity of the effluent or the on-line monitoring value chi of other pollutant control indexes is in the interval [ NL,NH]When the processing result is normal, the processing result is normal and correction is not needed; when the on-line monitoring value χ of the control index is in the interval (N)H，NHH) In the time, the chemical agent adding result is slightly low, the adding amount needs to be increased to remove more pollutants, and a correction coefficient k needs to be multiplied at the timeH(kH> 1); when the control index χ is in the interval [ NHH，Nstand) When the chemical dosage is too low, the correction factor k is multiplied by a larger valueHH(kHH＞kH> 1); on the contrary, when the control index χ is in the interval (N)LL,NL) It indicates that the dosage of the chemical agent is slightly higher, and the dosage needs to be reduced, and then the dosage needs to be multiplied by a correction coefficient kL(kL< 1); when the control index χ is less than or equal to NLLWhen the dosage of the chemical agent is too high, the chemical agent needs to be multiplied by a larger correction coefficient kLL(kLL＜kLLess than 1), thus realizing the automatic reduction of the dosage and achieving the purpose of saving the medicament consumption. LogicThe set 4 critical values and 4 correction coefficients in the editing can be set according to historical operating data, for example, the online monitoring value χ of the pollutant control index is set to be 0.8N under the normal operating conditionstandLeft and right, then NLL、NL、NH、NHHCan be respectively assigned with N of 0.7, 0.75, 0.85 and 0.9 timesstandAt this time, the coefficient k is correctedLL、kL、kH、kHHThe values can be respectively set to 0.8, 0.9, 1.1 and 1.2, and the values can be adjusted according to actual conditions in the later water treatment process operation process so as to achieve more accurate control effect.
The on-line monitoring instrument transmits a monitoring signal to the chemical agent intelligent controller, the signal belongs to an analog signal of 4-20mA, and the transmission flow of the analog signal in the intelligent controller is that the on-line monitoring instrument → an analog signal input terminal → an input signal integrated card → an IO integrated card → P L C touch controller → the IO integrated card → an output signal integrated card → an analog signal output terminal → a variable-frequency dosing pump.
The intelligent controller is connected to the existing P L C or SCADA data system in a digital communication mode to acquire required information when the on-line monitoring instrument or equipment in the factory is connected to other P L C or SCADA data system, and the communication modes of different project equipment are different, so that in order to enhance the communication compatibility of the system, the intelligent controller is added with a plurality of digital communication modes, and an IO integrated card and a P L C touch controller which can support a plurality of digital communications are selected in the aspect of electrical elements, so that signals of P L C or SCADA data systems of different brands in the factory can be normally transmitted to the chemical agent intelligent controller.
The chemical agent intelligent controller has compact layout of the electric elements inside, integrated P L C and IO card, 7-inch P L C touch controller including CPU, display, memory and driving module, compact buckle connection between the IO card and the input and output integrated module to save electric structure space greatly, the specific parameters and functions as follows:
the intelligent control system comprises a main power terminal, a DC-24V output terminal, a 4-20mA analog signal terminal, an analog signal output terminal, a ground wire, a P L C touch controller power supply and a P L C touch controller power supply, wherein the main power terminal can be connected with a 100-plus 240V and 50/60HZ alternating current power supply, the DC-24V output terminal provides a 24V direct current power supply for other elements in a box body, and can also provide a power supply for an external online monitor meter, the analog signal input terminal is used for receiving monitoring signals of an inlet water and outlet water online monitor meter and a dosing device, the terminal is a 4-20mA analog signal terminal and the analog signal output terminal outputs an analog control signal, and the calculation result (4-20mA analog signal) of an intelligent control algorithm is transmitted to a chemical dosing pump frequency converter to control the dosing amount.
In the aspect of signal transmission, except for adopting 4-20mA analog signals, the chemical agent intelligent control system P L C can support various digital communication modes, can be directly connected with other P L C or SCADA systems in a factory and can acquire related data.
The intelligent control center calculates control signals which are converted into 4-20mA analog signals through the IO card and then transmitted to AN output terminal through the output signal integrated card, the router and a wireless network transmission module are added with Raspberry Pi3B + electrical elements which have the functions of being responsible for storage, preprocessing and transmission of data, and are added with AN industrial router to provide a network for the intelligent control center, so that the remote operation data and the remote control process transmission function of the factory can be realized, and the remote operation management function of the factory can be realized without being limited to remote water supply management and remote water supply management of a factory.
Fig. 2 is a circuit design diagram of electric elements in the intelligent controller for water supply and wastewater treatment chemicals, the intelligent controller greatly reduces the volume of the controller by reasonably selecting and closely arranging the electric elements, the appearance size of the intelligent controller is only 400mm 200mm, and the intelligent controller is very convenient to carry, transport and install. The symbol descriptions shown in the circuit diagram are shown in table 1:
TABLE 1 Circuit diagram symbol description table
| Symbol | Name of power supply element | Description of the parameters |
| F | Circuit switch | \ |
| G | Power conversion adapter | 100-240VAC/24VDC,2.5A |
| U1 | Network adapter IO card | Network port Ethernet RJ-45, Modbus TCP/IP |
| U2、U3 | Input signal integrated card | 4-20mA analog signal, 8 signal channel |
| U4 | Output signal integrated card | 4-20mA analog signal, 4 signal channel |
| U5 | Intelligent |
7 inch HMI, display and P L C program integration, 18-32VDC |
| U6 | Router/wireless network transmission module | 4G 2L AN, Raspberry Raspberry Pi3B + |
| X1 | Main power supply terminal | 100-240VAC,50/60HZ |
| X10 | Analog signal input terminal | 4-20mA analog signal, 8 channel connecting terminal |
| X20 | Analog signal input terminal | 4-20mA analog signal, 8 channel connecting |
| X24 | ||
| 24V line | 0.5-2.5mm2 | |
| X230 | External power circuit | 0.5-2.5mm2 |
| X30 | Analog signal output terminal | 4-20mA analog signal, 8 channel connecting terminal |
The control system of the embodiment of the disclosure realizes automatic real-time adjustment of chemical agents in the water supply and wastewater treatment process, and provides a more convenient and efficient working mode for operation managers.
The control system of the embodiment of the disclosure realizes diversification of communication modes, has good communication compatibility, can perform perfect communication with the original control equipment in a factory, and has more flexible application conditions.
The control system of the embodiment of the disclosure realizes the ultra-remote monitoring and operation functions of the operation process, and provides a very convenient remote control mode for the management and command personnel outside the plant.
The control system of the embodiment of the disclosure has a wide application range, and the control logic of the control system is applicable to the control and addition of various coagulants, flocculants, coagulant aids and other medicaments in the process of water supply and wastewater treatment. The controller is small in size and convenient to carry, transport and install.
Through automatic control, the rough mode that frequent regulation and control excessively depends on manpower in the water supply and wastewater treatment process is solved, the chemical agent dosage is automatically regulated in real time, and a more convenient and efficient working mode is provided for operation managers; by adding a plurality of communication modes, the problem of communication between the water supply plant and other control equipment or instruments in the wastewater treatment plant is solved, and the water supply plant has good communication mode compatibility and more flexible application conditions; by adding the remote storage and transmission module, the ultra-remote monitoring and operation functions of the operation process are realized, and the operation condition in the plant can be conveniently checked by management and command personnel outside the plant at any time and any place; the prior large cabinet type electric control box is abandoned, and a small intelligent controller is provided, the volume is only 400mm x 200mm, and the carrying and the installation are convenient.
The intelligent control system can be widely applied to the control and addition of various coagulants, flocculants and coagulant aids in water supply and wastewater treatment.
Example two
The embodiment aims to provide a chemical agent intelligent adding control method, which comprises the following steps:
collecting pollutant concentration information of a water inlet end of a pollutant removal reaction tank;
analyzing according to the historical operating data of the pollutant concentration information, establishing a mathematical control model with the chemical agent addition amount as output, pre-calculating the chemical agent addition amount in real time, and automatically adding the chemical agent;
collecting pollutant concentration information of a water outlet end of a pollutant removal reaction tank, feeding back a treatment result after chemical agents are added in real time, judging whether the chemical agents meet the requirement or not according to a set water outlet index range, and if the chemical agents do not meet the control requirement, performing proportion correction on a budget result until the budget result is within the set range.
The specific logic rule of the proportion correction is as follows:
setting the effluent execution standard to NstandSetting 4 critical values as minimum value N for water outlet in daily operationLLLower value NLHigher value of NHMaximum value NHHThe specific relationship is NLL＜NL＜NH＜NHH＜Nstand；
When the COD/TP/turbidity of the effluent or other pollutant control index chi is in the interval [ N ]L,NH]When the processing result is normal, the processing result is normal and correction is not needed;
when the control index χ is in the interval (N)H，NHH) In the time, the chemical agent adding result is slightly low, the adding amount needs to be increased to remove more pollutants, and a correction coefficient k needs to be multiplied at the timeH，kH＞1；
When the control index χ is in the interval [ NHH，Nstand) When the chemical dosage is too low, the correction factor k is multiplied by a larger valueHH，kHH＞kH＞1；
When the control index χ is in the interval (N)LL,NL) It indicates that the dosage of the chemical agent is slightly higher, and the dosage needs to be reduced, and then the dosage needs to be multiplied by a correction coefficient kL，kL＜1；
When the control index χ is less than or equal to NLLWhen the dosage of the chemical agent is too high, the chemical agent needs to be multiplied by a larger correction coefficient kLL，kLL＜kLLess than 1, the dosage is automatically reduced, and the medicament consumption is saved.
The set 4 critical values and 4 correction coefficients are assigned according to historical operating data and can be adjusted according to actual conditions in later operation.
According to pollutant concentration information historical operation data, analyzing and establishing a mathematical control model which takes chemical agent adding amount as output, pre-calculating the agent adding amount in real time, wherein the specific process is as follows:
DOSE (addition amount) ═ single parameter + square coefficient + square parameter + cross coefficient, see equation (1):
DOSE + ythi + phpi + CNI + YSSI + SSI + phypi + opt + TPI + … (single parameter) + YTUITUI + TUI + yhphpi + phyuci CNI + yssisi + SSI + ysiopi + yssipti + ssississi + YOPIOPI + … (square parameter) + yhitui pHI + tusi + tussitusi + 3683 (cross parameter); equation (1).
In the multi-parameter equation (1), the symbol definitions are shown in table 2; the squaring and cross multiplication value rule rules of the parameters are shown in table 3; the definition of the single parameter, squared and cross-multiplied coefficient Y in the equation is shown in table 4.
TABLE 2 parameter definition Table
TABLE 3 table for taking values by cross-multiplication of parameter squares and sums in multi-parameter equation
TABLE 4 definition table of each coefficient Y in multi-parameter equation
| Single coefficient of performance | TUI | pHI | CNI | SSI | OPI | TPI | pHO | TMP | QIN | NN1 | NN2 | SED | TIM | DAY | PER | |
| TUI | YTUI | YTUITUI | ||||||||||||||
| pHI | YpHI | YpHITUI | YpHIpHI | |||||||||||||
| CNI | YCNI | YCNITUI | YCNIpHI | YCNICNI | ||||||||||||
| SSI | YSSI | YSSITUI | YSSIpHI | YSSICNI | YSSISSI | |||||||||||
| OPI | YOPI | YOPITUI | Y… | YOPICNI | YOPISSI | YOPIOPI | ||||||||||
| TPI | YTPI | YTPITUI | Y… | Y… | YTPISSI | YTPIOPI | YTPITPI | |||||||||
| pHO | YpHO | YpHOTUI | Y… | Y… | Y… | YpHOOPI | YpHOTPI | YpHOpHO | ||||||||
| TMP | YTMP | YTMPTUI | Y… | Y… | Y… | Y… | YTMPTPI | YTMPpHO | YTMPTMP | |||||||
| QIN | YQIN | YQINTUI | Y… | Y… | Y… | Y… | Y… | YQINpHO | YQINTMP | YQINQIN | ||||||
| NN1 | YNN1 | YNN1TUI | Y… | Y… | Y… | Y… | Y… | Y… | YNN1TMP | YNN1QIN | YNN1NN1 | |||||
| NN2 | YNN2 | YNN2TUI | Y… | Y… | Y… | Y… | Y… | Y… | Y… | YNN2QIN | YNN2NN1 | YNN2NN2 | ||||
| SED | YSED | YSEDTUI | Y… | Y… | Y… | Y… | Y… | Y… | Y… | Y… | YSEDNN1 | YSEDNN2 | YSEDSED | |||
| TIM | YTIM | YTIMTUI | Y… | Y… | Y… | Y… | Y… | Y… | Y… | Y… | Y… | YTIMNN2 | YTIMSED | YTIMTIM | ||
| DAY | YDAY | YDAYTUI | Y… | Y… | Y… | YDAYDAY | ||||||||||
| PER | YPER | YPERTUI | Y… | Y… | Y… | YPERPER |
Now, based on the above multi-parameter equation (1), the precise calculation and regulation process of the coagulant dosage is specifically as follows:
(1) the symbols of the water quality parameters are defined in table 2, the limit value is input by a user, and if no input is made, the default value is used.
(2) And table 3 shows the multiplication rule of the input values of the water quality parameters of all online monitoring, all online monitoring data are transmitted to the coagulant intelligent control operation center through a signal input module of the intelligent control device, and the operation center performs comprehensive processing on the data according to the multiplication rule in table 3 to obtain a series of interactive data and stores the interactive data in a large database. Program developers use the relevant on-line monitoring historical data to establish a multivariable process control model taking coagulant adding amount as output. With the extension of the running time of the sewage treatment process, the online monitoring water quality data is continuously updated, and the mathematical model is continuously corrected and upgraded.
(3) The definition of each coefficient Y in the multi-parameter equation (1) can be corresponding to table 3. The numerical values of the coefficients Y are assigned according to a mathematical model established by historical data, and the multi-parameter equation (1) can be put into operation after assignment is completed. When the real-time on-line monitoring instruments of the front feed unit and the feedback unit transmit data to the operation center, the data are cross-multiplied according to the operation specification shown in the table 2, all operation results in the table 3 are used as input values of the multi-parameter equation (1), so that accurate coagulant adding amount DOSE is obtained, the calculation results are transmitted to the coagulant adding execution unit, and the adjustment of the coagulant is completed. Since the on-line monitoring data is changed in real time, the output of the operation center is also dynamic, thus eliminating the time lag problem in adjustment.
(4) If a certain on-line monitor fails, if the QIN of the water quantity monitor reports an error, the operation program automatically uses the past 6-hour QIN average value as an input value; if a parameter value is not within the defined limits, it is discarded and the values and coefficients associated with the parameter term in tables 2 and 3 are 0 and do not participate in the equation calculation.
(5) And (3) feedback correction: the on-line monitor of the feedback unit can feed back the water purification result after coagulant addition to the operation center, the operation center comprises a plurality of feedback correction algorithms, the pH is taken as an example (parameters such as turbidity, SS, total phosphorus and the like of the feedback unit can also be used as feedback correction, and the operation center also comprises a corresponding correction algorithm), and the coagulant addition DOSE of the multi-parameter equation (1) is subjected to feedback adjustment so as to improve the stability of the intelligent control system.
Corrected DOSE DOSEcorrected＝KfactorDOSE … … equation (2).
In equation (2), KfactorTo correct the coefficients, it is calculated using the following formula, which follows the principle of continuous proportional gain scheduling with dead band:
obtaining a correction coefficient KfactorThe variation is shown in fig. 3. Wherein: parameter pHH、pHHH、pHL、pHLL、KHH、KH、KLAnd KLLTuning parameters are made to obtain the best correction for dose prediction. The coagulant is acidic and is addedThe more, the lower the effluent pH. According to this law: when the pH value of the effluent is in a normal range, the correction coefficient is 1, and the calculation result of equation 1 can be directly output; when the pH value of the effluent is higher than a normal range, the estimated amount of the coagulant in the equation 1 is insufficient, and in order to reach the normal standard range, the estimated amount is adjusted according to the proportion and multiplied by a correction coefficient to be used as a new output amount; when the pH value of the effluent is lower than the normal range, the fact that the budgeted amount of the coagulant in the equation 1 is too high is indicated, and the budgeted amount of the coagulant needs to be multiplied by a corresponding correction coefficient to reduce the adding amount.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. The utility model provides a chemical agent intelligence is thrown and is thrown control system which characterized by includes:
the system comprises an online monitoring instrument, a chemical agent intelligent controller and a dosing execution unit;
the online monitoring instrument is respectively arranged at the water inlet end and the water outlet end of the pollutant removal reaction tank and transmits the collected pollutant concentration information of the water inlet end and the water outlet end to the chemical agent intelligent controller;
the chemical agent intelligent controller analyzes according to the historical operating data of the pollutant concentration information and establishes a mathematical control model which takes the chemical agent adding amount as output, the chemical agent adding amount is estimated in real time, the adding amount signal is converted into the adding frequency and then transmitted to the adding agent execution unit, and the automatic adding of the chemical agent is realized.
2. The intelligent chemical dosing control system as claimed in claim 1, wherein the online monitoring instrument at the water outlet feeds back the treatment result of the chemical dosing to the intelligent chemical dosing controller in real time, the intelligent chemical dosing controller determines whether the dosing meets the requirement according to the set water outlet index range, and if the control requirement is not met, the budget result needs to be proportionally corrected.
3. The intelligent chemical dosing control system of claim 1 wherein the intelligent chemical controller includes an analog signal input terminal, an input signal integrated card, an IO integrated card and a P L C touch controller connected in sequence, and the output of the P L C touch controller is further connected in sequence to the output signal integrated card and the analog signal output terminal for analog signal transmission.
4. The intelligent chemical dosing control system of claim 1 wherein the intelligent chemical controller is connected to an external P L C or SCADA system via digital communication, and wherein multiple protocols and multiple serial connections are added to the intelligent chemical controller to enable signal access to different communicating P L C or SCADA data systems.
5. The intelligent chemical dosing control system of claim 3, wherein electrical components inside the intelligent chemical dosing controller are arranged in a compact manner, the P L C touch controller and the IO integrated card are all integrated modules, the P L C touch controller contains a CPU, a display, a memory and a driving module thereof, and the IO integrated card is connected with the input signal integrated card and the output signal integrated card in a tight snap-fit manner.
6. The intelligent chemical dosing control system as claimed in claim 1 wherein the intelligent chemical controller router is connected to a wireless network transmission module for data storage, preprocessing and transmission, and the router is an industrial router for providing a network for ultra-remote transmission of in-plant operational data and process pictures to the outside.
7. The intelligent chemical dosing control system of any one of claims 1 to 6 further comprising a power supply module, wherein the power supply module converts an alternating current power supply into a direct current power supply to provide a power supply for the intelligent chemical controller and the external online monitor meter.
8. An intelligent chemical agent adding control method is characterized by comprising the following steps:
analyzing according to the historical operating data of the pollutant concentration information, establishing a mathematical control model with the chemical agent addition amount as output, pre-calculating the chemical agent addition amount in real time, and automatically adding the chemical agent;
collecting pollutant concentration information of a water outlet end of a pollutant removal reaction tank, feeding back a treatment result after chemical agents are added in real time, judging whether the chemical agents meet the requirement or not according to a set water outlet index range, and if the chemical agents do not meet the control requirement, performing proportion correction on a budget result until the budget result is within the set range.
9. The intelligent chemical dosing control method as claimed in claim 8, wherein the specific logic rules for the proportion correction are:
setting the effluent execution standard to NstandSetting 4 critical values as minimum value N for water outlet in daily operationLLLower value NLHigher value of NHMaximum value NHHThe specific relationship is NLL＜NL＜NH＜NHH＜Nstand；
When the COD/TP/turbidity of the effluent or other pollutant control index chi is in the interval [ N ]L,NH]When the processing result is normal, the processing result is normal and correction is not needed;
when the control index χ is in the interval (N)H，NHH) When the dosage is small, the result of adding the chemical agent is shownLow, increased dosing is required to remove more contaminants, which requires multiplication by the correction factor kH，kH＞1；
When the control index χ is in the interval [ NHH，Nstand) When the chemical dosage is too low, the correction factor k is multiplied by a larger valueHH，kHH＞kH＞1；
When the control index χ is in the interval (N)LL,NL) It indicates that the dosage of the chemical agent is slightly higher, and the dosage needs to be reduced, and then the dosage needs to be multiplied by a correction coefficient kL，kL＜1；
When the control index χ is less than or equal to NLLWhen the dosage of the chemical agent is too high, the chemical agent needs to be multiplied by a larger correction coefficient kLL，kLL＜kLLess than 1, the dosage is automatically reduced, and the medicament consumption is saved.
10. The intelligent chemical dosing control method of claim 9 wherein the N and 4 thresholds and 4 calibration coefficients are set based on historical operating data and intelligent control system control data.
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