CN114911193A - Water works chlorination control method and system - Google Patents
Water works chlorination control method and system Download PDFInfo
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- CN114911193A CN114911193A CN202210844561.4A CN202210844561A CN114911193A CN 114911193 A CN114911193 A CN 114911193A CN 202210844561 A CN202210844561 A CN 202210844561A CN 114911193 A CN114911193 A CN 114911193A
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
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Abstract
The embodiment of the application provides a water works chlorination control method and system, the water works chlorination control method is applied to a water works chlorination control system, the water works chlorination control system comprises a data acquisition module, a chlorination PLC control module, a chlorination edge control module and a cloud computing platform, firstly, the chlorination PLC control module receives a chlorination control instruction, the control instruction carries a target control mode identification of a chlorination pump, the chlorination PLC control module selects a target control mode from a preset control mode set according to the target control mode identification, the preset control mode set comprises a main control mode, an auxiliary control mode and an automatic switching mode, and finally, the chlorination PLC control module controls chlorination of the chlorination pump according to the target control mode. The water works chlorination control method provided by the application can realize chlorination of the chlorination pump through different working modes, so that the water works chlorination control system is more intelligent.
Description
Technical Field
The application relates to the technical field of automatic control, in particular to a chlorination control method and system for a water works.
Background
In daily life, chlorination is an important process for treating tap water, and the aim is to control the residual chlorine content in the tap water from factory to be within a specified range. The chlorine adding flow is generally adjusted by adjusting the frequency of a frequency converter of a chlorine adding pump, so that the control of the residual chlorine in the effluent is realized.
The frequency of the traditional frequency converter of the chlorination pump is adjusted mainly by two modes, one mode is manual frequency adjustment by experienced workers, and the other mode is automatic adjustment by adopting closed-loop control with feedback. The closed-loop control process with feedback firstly feeds back the effluent residual chlorine signal to the PLC through the residual chlorine analyzer, the PLC compares the effluent residual chlorine signal with the set residual chlorine amount, and the chlorine adding amount of the chlorine adding pump is adjusted by utilizing the built-in PID. However, the PID parameters of the control system PLC are often determined according to the water quantity and water quality during the debugging, and when the water quality and other environments of the water plant fluctuate greatly, a technician needs to go to the site to debug and then modify the parameters to continue the adjustment, and the adjustment cannot adapt to the fluctuation of the water quantity and the water quality. Therefore, the traditional chlorination method for water works is not intelligent enough.
Disclosure of Invention
The embodiment of the application provides a water works chlorination control method and system, and improves the intelligent degree of the water works chlorination control system.
On one hand, the embodiment of the application provides a water works chlorination control method, the water works chlorination control method is applied to a water works chlorination control system, the water works chlorination control system comprises a data acquisition module, a chlorination PLC control module, a chlorination edge control module and a cloud computing platform, the data acquisition module is in bidirectional communication connection with the chlorination PLC control module, the chlorination PLC control module is in bidirectional communication connection with the chlorination edge control module, and the chlorination edge control module is in bidirectional communication connection with the cloud computing platform; the chlorination control method for the waterworks comprises the following steps:
the chlorination PLC control module receives a chlorination control instruction, and the control instruction carries a target control mode identifier of the chlorination pump;
the chlorination PLC control module selects a target control mode from a preset control mode set according to the target control mode identification, wherein the preset control mode set comprises a main control mode, an auxiliary control mode and an automatic switching mode;
and the chlorination PLC control module controls the chlorination pump to chlorinate according to the target control mode.
Optionally, in some possible implementations of the present application, the target control mode is an auxiliary control mode; the chlorination PLC control module controls the chlorination pump to add chlorine according to a target control mode, and comprises:
the chlorination PLC control module acquires operation data acquired by the data acquisition module, wherein the operation data comprises a water inflow value, a water inflow residual chlorine value, a water inflow temperature value, a medicament concentration value and a chlorination flow value;
the chlorination PLC control module sends the operation data to the chlorination edge control module;
the chlorination edge control module determines a target operation frequency interval of the chlorination pump based on a plurality of preset chlorination control strategy comparison tables and operation data, wherein the preset chlorination control strategy comparison tables comprise a comparison relation between an operation data interval and an output frequency interval, and the operation data interval comprises a water inlet flow interval, a water inlet residual chlorine interval, a water inlet temperature interval, a medicament concentration interval and a chlorination flow interval;
the chlorination edge control module sends the target operation frequency interval to the chlorination PLC control module;
and the chlorination PLC control module controls the chlorination pump to chlorinate according to the target operation frequency interval.
Optionally, in some possible implementations of the present application, the target operating frequency interval includes a first boundary operating frequency value and a second boundary operating frequency value, and the first boundary operating frequency value is smaller than the second boundary operating frequency value; the chlorination PLC control module controls the chlorination pump to add chlorine according to the target operation frequency interval, and the chlorination control method comprises the following steps:
the method comprises the steps that a chlorination PLC control module obtains a current frequency value of a chlorination pump;
if the current frequency value is less than or equal to the first boundary operation frequency value, the chlorination PLC control module controls the chlorination pump to add chlorine according to the first boundary operation frequency value;
if the current frequency value is greater than the second boundary operation frequency value, the chlorination PLC control module controls the chlorination of the chlorination pump according to the second boundary operation frequency value;
if the current frequency value is greater than or equal to the first boundary operation frequency value and less than the second boundary operation frequency value, the chlorination PLC control module controls the chlorination pump to add chlorine according to the third boundary operation frequency value, and the third boundary value is equal to the second boundary operation frequency value minus the first boundary operation frequency value and then divided by two.
Optionally, in some possible implementations of the present application, before the step of determining the target operating frequency interval of the chlorination pump based on the plurality of preset chlorination control strategy look-up tables and the operating data, the chlorination edge control module includes:
the chlorination edge control module uploads historical operation data acquired by the data acquisition module to a cloud computing platform, wherein the historical operation data comprises a historical inlet water flow value, a historical inlet residual chlorine value, a historical inlet water temperature value, a historical medicament concentration value, a historical chlorination flow value and a historical operation frequency;
the cloud computing platform determines a plurality of preset chlorination control strategy comparison tables according to historical operating data;
the chlorination edge control module obtains a plurality of preset chlorination control strategy comparison tables issued by the cloud computing platform.
Optionally, in some possible implementation manners of the present application, the determining, by the cloud computing platform, a plurality of preset chlorination control strategy comparison tables according to historical operating data includes:
the cloud computing platform divides a historical water inlet flow value, a historical water inlet residual chlorine value, a historical water inlet water temperature value, a historical medicament concentration value and a historical chlorine adding flow value in historical operating data respectively to obtain a plurality of operating data intervals;
and the cloud computing platform determines a plurality of preset chlorination control strategy comparison tables according to the comparison relationship between the plurality of operation data intervals and the output frequency intervals.
Optionally, in some possible implementation manners of the present application, the determining, by the cloud computing platform, the preset chlorination control policy comparison table according to a comparison relationship between a plurality of operation data intervals and an output frequency interval includes:
the cloud computing platform divides each interval in the operation data interval into a plurality of interval sections;
the cloud computing platform analyzes the control time and the control fluctuation of the multiple sections to obtain control fluctuation indexes and control time indexes corresponding to the multiple sections respectively;
the cloud computing platform determines the section corresponding to the minimum control fluctuation index and the minimum control time index as the optimal section;
and the cloud computing platform determines a preset chlorination control strategy comparison table according to the frequency control range and the chlorination flow range in the optimal section and the comparison relationship between a plurality of operation data sections and the output frequency section.
Optionally, in some possible implementation manners of the present application, the determining, by the cloud computing platform, the preset chlorination control policy comparison table according to the frequency control range and the chlorination flow range of the optimal section and the comparison relationship between the multiple operation data sections and the output frequency section includes:
the cloud computing platform acquires a chlorination flow measurement dead zone value and an effluent residual chlorine flow measurement dead zone value of a chlorination control system of a water plant;
and the cloud computing platform determines a preset chlorination control strategy comparison table according to the chlorination flow measurement dead zone value, the residual chlorination flow measurement dead zone value, the frequency control range and the chlorination flow range of the optimal section and the comparison relationship between a plurality of operation data sections and the output frequency section.
Optionally, in some possible implementations of the present application, the historical operating data includes historical operating feedback frequencies; the cloud computing platform obtains the chlorine adding flow measurement dead zone value and the residual chlorine flow measurement dead zone value of the water plant chlorine adding control system, and comprises:
the cloud computing platform obtains a chlorine flow measurement dead zone value according to historical output frequency, historical chlorine flow value and historical operation feedback frequency in historical operation data;
and the cloud computing platform obtains a flow measurement dead zone value of the inflow residual chlorine according to the historical output frequency, the historical inflow residual chlorine value and the historical operation feedback frequency in the historical operation data.
Optionally, in some possible implementations of the present application, the target control mode is an automatic switching mode; the chlorination PLC control module controls the chlorination pump to add chlorine according to a target control mode, and comprises:
in the preset chlorination time, the chlorination PLC control module controls the chlorination pump to chlorinate according to the master control mode, and records the effluent residual chlorine value in the preset chlorination time;
if the effluent residual chlorine value in the preset chlorination time is continuously smaller than the preset effluent residual chlorine value, switching the chlorination PLC control module to an auxiliary control mode;
and the chlorination PLC control module controls the chlorination pump to chlorinate according to the auxiliary control mode.
On the one hand, this application embodiment provides a water works chlorination control system, and water works chlorination control system includes data acquisition module, adds chlorine PLC control module, adds chlorine edge control module, cloud computing platform, and data acquisition module and the PLC control module both way communication of adding chlorine are connected, adds chlorine PLC control module and adds chlorine edge control module both way communication and is connected, adds chlorine edge control module and cloud computing platform both way communication and is connected, wherein:
the chlorination PLC control module is used for receiving a chlorination control instruction, and the control instruction carries a target control mode identifier of the chlorination pump;
the chlorination PLC control module is used for selecting a target control mode from a preset control mode set according to the target control mode identification, and the preset control mode set comprises a main control mode, an auxiliary control mode and an automatic switching mode;
and the chlorination PLC control module is used for controlling the chlorination pump to chlorinate according to the target control mode.
In one aspect, an embodiment of the present application provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program to implement the steps in the chlorination control method for a waterworks as described above.
In one aspect, the present application provides a computer-readable storage medium, in which a computer program is stored, and the computer program, when executed by a processor, implements the steps in the chlorination control method for a waterworks.
The embodiment of the application provides a water works chlorination control method and system, the water works chlorination control method is applied to a water works chlorination control system, the water works chlorination control system comprises a data acquisition module, a chlorination PLC control module, a chlorination edge control module and a cloud computing platform, firstly, the chlorination PLC control module receives a chlorination control instruction, the control instruction carries a target control mode identification of a chlorination pump, the chlorination PLC control module selects a target control mode from a preset control mode set according to the target control mode identification, the preset control mode set comprises a main control mode, an auxiliary control mode and an automatic switching mode, and finally, the chlorination PLC control module controls chlorination of the chlorination pump according to the target control mode. The water works chlorination control method provided by the application can realize chlorination of the chlorination pump through different working modes, so that the water works chlorination control system is more intelligent.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of a chlorination control system of a waterworks according to an embodiment of the present disclosure.
Fig. 2 is a first schematic flow chart of a chlorination control method for a waterworks according to an embodiment of the present disclosure.
Fig. 3 is a schematic diagram of a master mode control system according to an embodiment of the present application.
Fig. 4a is a schematic flow chart of a chlorination control method for a waterworks according to an embodiment of the present disclosure.
Fig. 4b is a schematic view of a third process of the chlorination control method in a waterworks according to the embodiment of the present application.
Fig. 5 is a schematic view illustrating an overall operation flow of the chlorination control system of the waterworks according to the embodiment of the present application.
Fig. 6 is a schematic structural diagram of an electronic device provided in an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a chlorination control method and system for a tap water plant. The water works chlorination control method is applied to the water works chlorination control system.
As shown in fig. 1, which is an architecture diagram of a chlorination control system of a waterworks provided in an embodiment of the present application, the chlorination control system of the waterworks includes a data acquisition module, a chlorination PLC control module, a chlorination edge control module, and a cloud computing platform, the data acquisition module is in bidirectional communication connection with the chlorination PLC control module, the chlorination PLC control module is in bidirectional communication connection with the chlorination edge control module, the chlorination edge control module is in bidirectional communication connection with the cloud computing platform,
the data acquisition module is responsible for acquiring data such as residual chlorine of inlet water, inlet water flow, inlet water temperature, residual chlorine of outlet water, chlorine adding flow and the like. The data acquisition module can be composed of data acquisition submodules such as a residual chlorine analyzer, a flowmeter, a thermometer and the like, for example: can obtain into water and go out the water chlorine content through chlorine analyzer, acquire into water, the instantaneous flow that goes out water and add chlorine through the flowmeter, acquire into water, ambient temperature through the thermometer, acquire the operational data of each equipment through the sensor. The specific data acquisition submodule is not limited herein, and any module capable of implementing the data acquisition function may be used.
The chlorination PLC control module is mainly responsible for receiving operation data, uploading the operation data to the chlorination edge control module, receiving a control instruction sent by the chlorination edge control module, and controlling the operation frequency of the chlorination pump in the water plant according to the control instruction.
The chlorination edge control module is mainly responsible for preprocessing, compressing and packaging read original data, periodically sending the data to the chlorination cloud computing platform, receiving a preset chlorination strategy comparison table issued by the cloud computing platform, processing field operation data, inputting the data into the preset chlorination strategy comparison table for matching and calculating to generate a control command, and then issuing the control command to the chlorination PLC control module.
The cloud computing platform collects field operation data, processes and analyzes the operation data, generates a preset chlorination strategy comparison table, and periodically sends the preset chlorination strategy comparison table to the chlorination edge control module.
In this application, the user sends the control command of chlorination, and chlorination PLC control module receives the control command of chlorination, and control command carries the target control mode sign of chlorination pump, and chlorination PLC control module selects the target control mode from predetermineeing the control mode set according to the target control mode sign, predetermines the control mode set and includes master control mode, auxiliary control mode and automatic switch mode, and chlorination PLC control module controls the chlorination pump according to the target control mode.
It should be noted that the schematic diagram of the architecture of the chlorination control system of the water plant shown in fig. 1 is only an example, the data acquisition module, the chlorination PLC control module, the chlorination edge control module, and the cloud computing platform described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not form a limitation on the technical solution provided in the embodiment of the present application, and it can be known by those skilled in the art that as the system evolves and a new business office appears, the technical solution provided in the embodiment of the present application is also applicable to similar technical problems. The following are detailed below. It should be noted that the following description of the embodiments is not intended to limit the preferred order of the embodiments.
Referring to fig. 2, fig. 2 is a first schematic flow chart of a chlorination control method for a waterworks, which is applied to the chlorination control system of the waterworks, according to an embodiment of the present disclosure, and the chlorination control method for the waterworks includes:
step 201, a chlorination PLC control module receives a chlorination control instruction, and the control instruction carries a target control mode identifier of a chlorination pump.
The chlorination control command can be triggered when the chlorination control device of the water works is started, or can be triggered by a user through a key of the chlorination control device of the water works, and a specific control command touch mode is not limited herein, wherein the control command carries a target control mode identifier of the chlorination pump.
202, the chlorination PLC control module selects a target control mode from a preset control mode set according to the target control mode identification, wherein the preset control mode set comprises a main control mode, an auxiliary control mode and an automatic switching mode.
In the present application, the preset control mode set includes a main control mode, an auxiliary control mode, and an automatic switching mode.
In one embodiment, the master control mode is a cascade control system with multiple inputs (output residual chlorine, frequency converter operating frequency) and single output (frequency control of a chlorine adding pump).
Fig. 3 is a schematic diagram of a master control mode control system according to an embodiment of the present application, where the master control mode includes a first-stage feedback control and a second-stage feedback control. Defining the residual chlorine control set value of the first-stage feedback control of the chlorination cascade control system of the water plant as r 1 (t), residual chlorine feedback is y1(t), output control is u1(t), the deviation signal is e1(t), and the PID control model of master control input and output is:
in the above formula, the first and second carbon atoms are,
is a proportional coefficient of the amount of the particles,
in order to integrate the time constant,
in order to differentiate the time constant,
the deviation formula is a transfer function:
。
as can be seen from fig. 3, in the present system, the output of the first stage feedback control is the input of the second stage feedback control, i.e., the frequency set point of the frequency converter of the chlorination pump. Defining the frequency control set value of the second-stage feedback control as
The frequency feedback is y2(t), the output control is u2(t), and the offset signal is e2 (t). The PID control model of auxiliary control input and output is as follows:
in the above formula, the first and second carbon atoms are,
is a coefficient of proportionality that is,
in order to be able to integrate the time constant,
in order to be a time constant for differentiation,
the deviation formula is a transfer function:
。
the chlorination control PLC module firstly compares the effluent residual chlorine measured value with the residual chlorine control set value
And the PID module controlled by the first stage calculates a frequency control set value and sends out a control signal. Then the PLC measures the frequency value output by the frequency converter and compares the frequency value with a frequency output set value
Through the firstAnd the PID module of the primary control calculates the adjustment value of the frequency output and sends the frequency output adjustment value to the frequency converter. Therefore, the PLC adjusts the chlorine adding flow by adjusting the frequency of the chlorine adding frequency converter, thereby realizing the control of the residual chlorine in the effluent.
The secondary control mode and the automatic switching mode in the preset control mode set are described in detail in the following.
And 203, controlling the chlorination pump to chlorinate by the chlorination PLC control module according to the target control mode.
And the chlorination PLC control module controls the chlorination pump to chlorinate according to the target control mode determined in the previous step.
Referring to fig. 4a, fig. 4a is a second schematic flow chart of the chlorination control method for a waterworks according to the embodiment of the present application, and is applied to the chlorination control system for a waterworks, step 203 may further include:
In the present application, the operational data includes the feed water flow value Q w Residual chlorine value Cl of inlet water i Water inlet temperature value T s Concentration value of drug Cl d And chlorine addition flow rate value Q cl 。
And after receiving the operation data, the chlorination PLC control module sends the operation data to the chlorination edge control module.
In the application, the preset chlorination control strategy comparison table comprises a comparison relation between an operation data interval and an output frequency interval, and the preset chlorination control strategy comparison table is periodically issued to the chlorination edge control module by the cloud computing platform.
TABLE 1 Preset Chlorination control strategy comparison Table
| Interval n | Interval of water inflow | Water inflow residual chlorine interval | Water inlet temperature range | Interval of medicament concentration | Interval of flow rate of chlorine addition | Frequency range output |
| Data range | [an1,an2] | [bn1,bn2] | [cn1,cn2] | [dn1,dn2] | [en1,en2] | [fn1,fn2] |
In the preset chlorination control strategy comparison table, the data items are all ranges, such as the inflow interval an1 ≦ an 2. And in each interval range, the cloud computing platform analyzes and updates the historical data and periodically issues the historical data to the chlorination edge control module. The chlorination edge control module is used for controlling the chlorination edge according to the operation data after noise reduction: inflow value Q w Residual chlorine value Cl of inlet water i Water inlet temperature value T s Concentration value of drug Cl d And addChlorine flow rate value Q cl And matching the plurality of preset chlorination control strategy comparison tables to obtain the frequency converter output frequency interval of the chlorination pump. The method comprises the following specific steps:
let t1 time point acquire data and perform noise reduction calculation, input data is
=[Qw 1 ，Cli 1 ，T b1 ，Cl d1， Qcl 1 ]Wherein t1 represents the data at time t1, Q w1 Representing the inflow value at time t, C li1 Represents the residual chlorine value of the inlet water at the time T, T b1 Represents the water inlet temperature value and Cl at the time t d1 Concentration value of drug at t-time, Q at t-time cl1 Chlorine addition flow rate value.
Traverse all the policy tables and will
Substituting various data, if finding the nth form satisfies the condition of an 1-Qw 1-an 2, bn 1-Cli 1-bn 2, cn 1-Tb 1-cn 2, dn 1-Clcl 1-dn 2, en 1-Qcl 1 Less than or equal to en2, the target operation frequency interval is [ fn1, fn2]。
In order to ensure the stable operation of the chlorination system of the water works, the control change amplitude needs to be as small as possible, so that the last frequency output needs to be considered
According to the last frequency
And comparing the frequency with values at two ends of a target operation frequency interval to determine the final operation frequency of the chlorination pump, wherein the specific exact method comprises the following steps: if it is
≤f n1 Then the
If, if
＞fn2 Then
If f is n1 ≤
＜f n2 Then, then
。
In one embodiment, the target operating frequency interval includes a first boundary operating frequency value and a second boundary operating frequency value, the first boundary operating frequency value being less than the second boundary operating frequency value; the chlorination PLC control module controls the chlorination pump to add chlorine according to the target operation frequency interval, and the chlorination control method comprises the following steps: the method comprises the steps that a chlorination PLC control module obtains a current frequency value of a chlorination pump; if the current frequency value is less than or equal to the first boundary operation frequency value, the chlorination PLC control module controls the chlorination pump to add chlorine according to the first boundary operation frequency value; if the current frequency value is greater than the second boundary operation frequency value, the chlorination PLC control module controls the chlorination of the chlorination pump according to the second boundary operation frequency value; if the current frequency value is greater than or equal to the first boundary operation frequency value and less than the second boundary operation frequency value, the chlorination PLC control module controls the chlorination pump to add chlorine according to the third boundary operation frequency value, and the third boundary value is equal to the second boundary operation frequency value minus the first boundary operation frequency value and then divided by two.
And the chlorination edge control module sends the target operation frequency interval determined in the previous step to the chlorination PLC control module.
And 2035, controlling the chlorination pump to add chlorine by the chlorination PLC control module according to the target operation frequency interval.
And the chlorination PLC control module receives the target operation frequency interval sent by the chlorination edge control module, and controls the chlorination of the chlorination pump according to the target operation frequency interval, namely, the frequency converter output frequency of the chlorination pump is adjusted to the target operation frequency interval.
The water plant chlorination control method provided by the application is based on a plurality of preset chlorination control strategy comparison tables and the operation data to determine the target operation frequency interval of the chlorination pump, the factors of water quality, water temperature and the like to the chlorination control system of the water plant are considered, the obtained target operation frequency interval is more consistent with the actual condition of the water plant, and the chlorination amount is more accurate.
Referring to fig. 4b, fig. 4b is a third schematic flow chart of the chlorination control method for a waterworks according to the embodiment of the present application, and the chlorination control system for a waterworks may further include, before step 2033:
In the present application, the operation data and the historical operation data are data at different times, wherein the operation data may be understood as operation data at the current time, and the historical transportation data is operation data at a time before the current time. The historical operation data comprises historical water inflow value, historical water inflow residual chlorine value, historical water inflow temperature value, historical medicament concentration value, historical chlorine adding flow value and historical operation frequency.
And analyzing the historical operating data by the cloud computing platform to obtain a plurality of preset chlorination control strategy comparison tables.
Firstly, according to historical operating data, initially dividing the interval of a preset chlorination control strategy comparison table. The following illustrates the initial partitioning.
Water inflow rate: the initial interval of water volume is related to the scale of the water plant, and a set range of 110% of the maximum water volume is processed according to the design day. The specific subareas are valued according to the production scale of a water plant. For example, if the maximum water treatment amount of a water plant in one year is 5000 tons/day, the water amount is divided into the following zones:
| partition number | Q[1] | Q[2] | …… | Q[9] | Q[10] |
| Range of water amount | 0~500 | 500~1000 | …… | 4000~4500 | 4500~5000 |
Note: the range of 0 to 500 means that the water quantity is more than 0 and less than or equal to 500, and the following is the same.
Residual chlorine of inlet water: the condition of residual chlorine at the inlet of each water plant is different. Setting the conventional inlet residual chlorine range of a certain water plant as 0-1 mg, and partitioning according to 0.05mg as follows:
| section number | R[1] | R[2] | …… | R[19] | R[20] |
| Residual chlorine range | 0~0.1 | 0.1~0.2 | …… | 0.9~0.95 | 0.95~1.0 |
Concentration value of the drug: the division of the chlorine content is related to the adopted chlorine supplementing raw materials. For water plants adopting sodium hypochlorite solution, about 10% concentration is generally adopted for dilution and then addition, and partitioning is carried out according to 1% effective chlorine content according to the operation characteristics of different water plants. For example, a water plant using a 1:1 dilution scheme, would be zoned by 5% with its maximum chlorine content multiplied by the balance of 1.2, as follows:
| partition number | C[1] | C[2] | C[3] | C[4] | C[5] | C[6] |
| Chlorine containing range | 0~1% | 1%~2% | 2%~3% | 3%~4% | 4%~5% | 5%~6% |
Water inlet temperature value: the water temperature is partitioned according to the dissolution rate and stability of the chlorinated drug. At present, most of water plants use sodium hypochlorite solution (the dissolution rate of sodium hypochlorite is about 45% at 25 ℃), and the water plants are partitioned according to the temperature of 5 ℃, and the range of the water plants is adjusted according to different regional records. For example, the area in Central China ranges from 5 ℃ to 35 ℃, as follows:
| partition number | T[1] | T[2] | T[3] | T[4] | T[5] |
| Range of |
5~10 | 10~15 | 15~20 | 25~30 | 30~35 |
When the cloud computing platform receives a data Z 1 =[t 1 ，Q w1 ，Cl i1 ，T s1 ，Q cl1 ，Cl d1 ]Wherein t1 represents the data at time t1, Q w1 Representing the inflow value at time t, C li1 Represents the residual chlorine value of the inlet water at the time T, T s1 Represents the water inlet temperature value and Cl at the time t d1 Concentration value of drug at t-time, Q at t-time cl1 Chlorine addition flow rate value according to the inlet water quantity Q w1 Inlet water Cl i1 Chlorine content Cl of chlorination storage tank d1 And the water temperature T s1 Matching and recording are performed. Thereby specifying intervals (Q1) for each group]、R[1]And) a series of historical operating data of the system can be recorded.
Obtaining operation data intervals according to historical operation data, wherein the operation data intervals comprise a water inlet flow value interval, a water inlet residual chlorine interval, a water inlet temperature interval, a medicament concentration interval and a chlorine adding flow interval, and determining operation frequencies corresponding to the operation data intervals from the historical data.
In one embodiment, the cloud computing platform determines a plurality of preset chlorination control strategy comparison tables according to historical operating data, and the method includes the following steps: the cloud computing platform divides a historical water inlet flow value, a historical water inlet residual chlorine value, a historical water inlet water temperature value, a historical medicament concentration value and a historical chlorine adding flow value in historical operating data respectively to obtain a plurality of operating data intervals; and the cloud computing platform determines a plurality of preset chlorination control strategy comparison tables according to the comparison relationship between the plurality of operation data intervals and the output frequency intervals.
The preset chlorination control strategy comparison table is obtained through historical data and an original dividing mode, and the accuracy is not too high, so that the preset chlorination control strategy comparison table can be further optimized through control section judgment and control effect evaluation.
The method comprises the steps of firstly partitioning each operation data interval in a preset chlorination control strategy comparison table to obtain a plurality of partitioned sections, then calculating control fluctuation indexes and control time indexes corresponding to the multiple partitioned sections respectively, and finally optimizing the preset chlorination control strategy comparison table according to the determined control fluctuation indexes and the determined control time indexes.
For a continuous set of data, the control effect of the system on it is defined as: when the system is in a stable state, the calculation is started when the inlet residual chlorine changes, the deviation between the outlet residual chlorine and the set value is within a small range within the specified time, and the control output command and the chlorine adding flow output change are within a small range, the system is considered to be controlled (enters the system stable state). In the embodiment of the present application, the period from the beginning of the change to the control adjustment state to the system steady state is recorded as a control process segment.
The control time index is determined as follows:
first, for two pieces of data Z measured successively 1 、Z 2 And recording the residual chlorine difference change reference value of the inlet as follows:
recording the chlorine flow change reference value as:
and recording the deviation between the residual chlorine of the water and the set value as the reference:
。
in the above formula, Cl a Measuring the dead zone value, Q, for the residual chlorine flow of the effluent a The dead zone value was measured for the chlorination flow.
In the present application, at t 1 Time of day, is calculated to
If the residual chlorine fluctuation is larger than 5%, the system is judged to have inlet residual chlorine fluctuation, and the system should enter a chlorination adjustment control mode. From t 1 From time to t n Continuously recording the time within a preset duration
，
，
At that time, the system control is considered to have stabilized. The time difference epsilon is recorded as a control time index,
。
the control fluctuation index determination method is as follows:
the technical scheme sets a control fluctuation index as the judgment of the control amplitude. For a series of data Z from time t1 to time tn 1 、Z 2 ……Z n Recording residual chlorine Cl in the water o Has an average value of
The standard deviation is:
calculating the control standard deviation rate:
and delta is used as a control fluctuation index, and the larger the value of delta is, the larger the control adjustment fluctuation is, the poorer the control effect is.
For a chlorination system, the smaller the time epsilon from the occurrence of an input disturbance to the stabilization of control, the better the control fluctuation index delta should be.
Therefore, the system carries out control state analysis on historical data, can intercept a plurality of control process sections, and calculates a control time index epsilon and a control fluctuation index delta of the control process sections, and supposing that m control process sections are calculated, namely D 1 =[ε 1 , δ 1 ]、D 2 = [ε 2 , δ 2 ]、……、D m = [ε m , δ m ]The system firstly sequences the time indexes from small to large, and sequences the fluctuation indexes from small to large when the control process at the same time is short, so that the control section with the best control effect, namely the optimal section is found.
In one embodiment, the determining, by the cloud computing platform, the preset chlorination control strategy comparison table according to the comparison relationship between the multiple operation data intervals and the output frequency interval includes: the cloud computing platform divides each interval in the operation data interval into a plurality of interval sections; the cloud computing platform analyzes the control time and the control fluctuation of the multiple sections to obtain control fluctuation indexes and control time indexes corresponding to the multiple sections respectively; the cloud computing platform determines the section corresponding to the minimum control fluctuation index and the minimum control time index as the optimal section; and the cloud computing platform determines a preset chlorination control strategy comparison table according to the frequency control range and the chlorination flow range in the optimal section and the comparison relationship between a plurality of operation data sections and the output frequency section.
And then, the cloud computing platform counts the output frequency and the chlorination flow feedback of the optimal control process section. Examine its frequency control range [ e ] 1 ，e 2 ]And corresponding chlorination flow range [ f ] 1 ，f 2 ]Control of the dead band value F in conjunction with the frequency a And the system chlorine adding flow measuring dead zone Q a If, if
And is
Then the frequency feedback range is split into small segments of frequency range [ e ] 1 ，
]，[
，e 2 ](and the chlorination flow ranges corresponding to the two small sections respectively) until one of the conditions is not met, and then the control strategy table in the partition is updated as a new form record.
In one embodiment, the cloud computing platform determines a preset chlorination control strategy comparison table according to a frequency control range and a chlorination flow range of an optimal section and a comparison relationship between a plurality of operation data sections and output frequency sections, including: the cloud computing platform acquires a chlorination flow measurement dead zone value and an effluent residual chlorine flow measurement dead zone value of a chlorination control system of a water plant; and the cloud computing platform determines a preset chlorination control strategy comparison table according to the chlorination flow measurement dead zone value, the effluent residual chlorine flow measurement dead zone value, the frequency control range and the chlorination flow range of the optimal section and the comparison relation between a plurality of operation data sections and the output frequency section.
The chlorine adding flow measurement dead zone value and the effluent residual chlorine flow measurement dead zone value obtained in the steps can be obtained through manual experience, and are stored in a cloud computing platform or can be obtained through calculation.
In one embodiment, the historical operating data includes historical operating feedback frequencies; the cloud computing platform obtains water works chlorination flow measurement blind spot value and the surplus chlorine flow measurement blind spot value of going out water of chlorination control system, includes: the cloud computing platform obtains a chlorine flow measurement dead zone value according to historical output frequency, historical chlorine flow value and historical operation feedback frequency in historical operation data; and the cloud computing platform obtains a flow measurement dead zone value of the effluent residual chlorine according to the historical output frequency, the historical water inflow residual chlorine value and the historical operation feedback frequency in the historical operation data.
If the output frequency command and the operation frequency feedback in the chlorination control system of the water works are changed consistently and the instantaneous chlorination flow is not changed, recording as chlorinationFlow measurement dead zone, denoted Q a Which reflects the current accuracy of the chlorination flow meter.
Taking a piece of data Z 1 Wherein t is 1 、H o1 、H i1 、Q cl1 Looking for the next data Z 2 Wherein t is 2 、H o2 、H i2 、Q cl2 Satisfy the requirement of
Memory for recording
，
，
. If it is
If the frequency of the frequency converter can be changed, the chlorine adding flow detection can respond to the frequency change of the control instruction frequency converter; otherwise, the control instruction frequency converter frequency is changed, but the chlorine adding flow measurement data is not responded, and the chlorine adding flow measurement data is recorded
Is a period of time
The flow of chlorinated water in between measures the dead zone. Continue to find the next record and accumulate
And
the record at the nth record satisfies
At this time, the control command change is recordedThe recorded chlorine addition flow is measured as
. Traversing historical data, and taking the maximum value of the flow measurement dead zone of the chlorination process as the Q of the current system a . The cloud platform regularly calculates Q according to historical data of the last half year a 。
In the same way, if the water inlet amount, the residual chlorine of the inlet water and the concentration of the storage tank are fixed values, the change of the residual chlorine of the outlet water is consistent with the chlorine adding flow. From this, the measured dead band value Cla of the effluent residual chlorine can be calculated.
The cloud computing platform issues the plurality of preset chlorination control strategy comparison tables to the chlorination edge control module, and the chlorination edge control module obtains the plurality of preset chlorination control strategy comparison tables issued by the cloud computing platform, as shown in fig. 5, the overall operation flow diagram of the water plant chlorination control system provided in the embodiment of the present application is shown.
Before the step of determining the target operation frequency interval of the chlorination pump based on the plurality of preset chlorination control strategy comparison tables and the operation data by the chlorination edge control module, the chlorination edge control module uploads the historical operation data acquired by the data acquisition module to the cloud computing platform, the historical operation data comprises a historical intake water flow value, a historical intake water residual chlorine value, a historical intake water temperature value, a historical chemical concentration value, a historical chlorination flow value and historical operation frequency, the cloud computing platform determines the plurality of preset chlorination control strategy comparison tables according to the historical operation data, and the chlorination edge control module acquires the plurality of preset chlorination control strategy comparison tables issued by the cloud computing platform. According to the method, the cloud computing platform continuously optimizes the preset chlorination control strategy comparison table through historical operating data, the preset chlorination control strategy comparison table is more adaptive to the water plant environment, and the target operating frequency range obtained through the preset chlorination control strategy comparison table is more accurate.
The embodiment of the application still provides a water works chlorination control system, water works chlorination control system includes data acquisition module, chlorination PLC control module, chlorination edge control module, cloud computing platform, and data acquisition module and chlorination PLC control module both way communication are connected, and chlorination PLC control module and chlorination edge control module both way communication are connected, and chlorination edge control module and cloud computing platform both way communication are connected, wherein:
the chlorination PLC control module is used for receiving a chlorination control instruction, and the control instruction carries a target control mode identifier of the chlorination pump;
the chlorination PLC control module is used for selecting a target control mode from a preset control mode set according to the target control mode identification, and the preset control mode set comprises a main control mode, an auxiliary control mode and an automatic switching mode;
and the chlorination PLC control module is used for controlling the chlorination of the chlorination pump according to the target control mode.
Accordingly, embodiments of the present application also provide an electronic device, as shown in fig. 6, which may include components such as a radio frequency circuit 601, a memory 602 including one or more computer-readable storage media, an input unit 603, a display unit 604, a sensor 605, an audio circuit 606, a WiFi module 607, a processor 608 including one or more processing cores, and a power supply 609. Those skilled in the art will appreciate that the electronic device configuration shown in fig. 6 does not constitute a limitation of the electronic device and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components. Wherein:
the rf circuit 601 may be used for receiving and transmitting signals during information transmission and reception or during a call, and in particular, receives downlink information of a base station and then sends the received downlink information to one or more processors 608 for processing; in addition, data relating to uplink is transmitted to the base station. The memory 602 may be used to store software programs and modules, and the processor 608 executes various functional applications and data processing by operating the software programs and modules stored in the memory 602. The input unit 603 may be used to receive input numeric or character information and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control.
The display unit 604 may be used to display information input by or provided to a user and various graphical user interfaces of the electronic device, which may be made up of graphics, text, icons, video, and any combination thereof.
The electronic device may also include at least one sensor 605, such as a light sensor, motion sensor, and other sensors. Audio circuitry 606 includes speakers that can provide an audio interface between a user and the electronic device.
WiFi belongs to a short-distance wireless transmission technology, and the electronic device can help a user send and receive e-mail, browse web pages, access streaming media, etc. through the WiFi module 607, and it provides wireless broadband internet access for the user, although fig. 6 shows the WiFi module 607, it is understood that it does not belong to the essential components of the electronic device, and can be omitted as needed within the scope of not changing the essence of the application.
The processor 608 is a control center of the electronic device, connects various parts of the entire mobile phone by using various interfaces and lines, and performs various functions of the electronic device and processes data by operating or executing software programs and/or modules stored in the memory 602 and calling data stored in the memory 602, thereby performing overall monitoring of the mobile phone.
The electronic device also includes a power supply 609 (e.g., a battery) for powering the various components, which may preferably be logically coupled to the processor 608 via a power management system, such that the power management system may manage charging, discharging, and power consumption.
Although not shown, the electronic device may further include a camera, a bluetooth module, and the like, which are not described in detail herein. Specifically, in this embodiment, the processor 608 in the electronic device loads the executable file corresponding to the process of one or more application programs into the memory 602 according to the following instructions, and the processor 608 runs the application programs stored in the memory 602, so as to implement the following functions:
the chlorination PLC control module receives a chlorination control instruction, and the control instruction carries a target control mode identifier of the chlorination pump;
the chlorination PLC control module selects a target control mode from a preset control mode set according to the target control mode identification, wherein the preset control mode set comprises a main control mode, an auxiliary control mode and an automatic switching mode;
and the chlorination PLC control module controls the chlorination pump to chlorinate according to the target control mode.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and parts that are not described in detail in a certain embodiment may refer to the above detailed description, and are not described herein again.
It will be understood by those skilled in the art that all or part of the steps of the methods of the above embodiments may be performed by instructions or by associated hardware controlled by the instructions, which may be stored in a computer readable storage medium and loaded and executed by a processor.
To this end, the present application provides a storage medium, in which a plurality of instructions are stored, and the instructions can be loaded by a processor to implement the following functions:
the chlorination PLC control module receives a chlorination control instruction, and the control instruction carries a target control mode identifier of the chlorination pump;
the chlorination PLC control module selects a target control mode from a preset control mode set according to the target control mode identification, wherein the preset control mode set comprises a main control mode, an auxiliary control mode and an automatic switching mode;
and the chlorination PLC control module controls the chlorination pump to chlorinate according to the target control mode.
The above operations can be implemented in the foregoing embodiments, and are not described in detail herein.
Wherein the storage medium may include: read Only Memory (ROM), Random Access Memory (RAM), magnetic or optical disks, and the like.
Since the instructions stored in the storage medium can execute the steps in any one of the waterworks chlorination control methods provided in the embodiments of the present application, the beneficial effects that can be achieved by any one of the waterworks chlorination control methods provided in the embodiments of the present application can be achieved, for details, see the foregoing embodiments, and are not described herein again.
The water works chlorination control method and system provided by the embodiments of the present application are introduced in detail, and the principle and implementation manner of the present application are explained by applying specific examples, and the description of the embodiments is only used to help understanding the technical scheme and core ideas of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.
Claims (10)
1. A water works chlorination control method is characterized in that the water works chlorination control method is applied to a water works chlorination control system, the water works chlorination control system comprises a data acquisition module, a chlorination PLC control module, a chlorination edge control module and a cloud computing platform, the data acquisition module is in bidirectional communication connection with the chlorination PLC control module, the chlorination PLC control module is in bidirectional communication connection with the chlorination edge control module, and the chlorination edge control module is in bidirectional communication connection with the cloud computing platform; the chlorination control method for the tap water plant comprises the following steps:
the chlorination PLC control module receives a chlorination control instruction, and the control instruction carries a target control mode identifier of the chlorination pump;
the chlorination PLC control module selects a target control mode from a preset control mode set according to the target control mode identification, wherein the preset control mode set comprises a main control mode, an auxiliary control mode and an automatic switching mode;
and the chlorination PLC control module controls the chlorination pump to chlorinate according to the target control mode.
2. The chlorination control method for waterworks according to claim 1, wherein the target control mode is an auxiliary control mode; the chlorination PLC control module controls the chlorination pump to chlorinate according to the target control mode, and the chlorination PLC control module comprises:
the chlorination PLC control module acquires operation data acquired by the data acquisition module, wherein the operation data comprises a water inlet flow value, a water inlet residual chlorine value, a water inlet temperature value, a medicament concentration value and a chlorination flow value;
the chlorination PLC control module sends the operation data to the chlorination edge control module;
the chlorination edge control module determines a target operation frequency interval of the chlorination pump based on a plurality of preset chlorination control strategy comparison tables and the operation data, wherein the preset chlorination control strategy comparison tables comprise comparison relations between operation data intervals and output frequency intervals, and the operation data intervals comprise a water inlet flow interval, a water inlet residual chlorine interval, a water inlet temperature interval, a medicament concentration interval and a chlorination flow interval;
the chlorination edge control module sends the target operation frequency interval to the chlorination PLC control module;
and the chlorination PLC control module controls the chlorination pump to chlorinate according to the target operation frequency interval.
3. The water plant chlorination control method of claim 2 wherein the target operating frequency interval includes a first boundary operating frequency value and a second boundary operating frequency value, the first boundary operating frequency value being less than the second boundary operating frequency value; the chlorination PLC control module controls the chlorination pump to chlorinate according to the target operation frequency interval, and the chlorination PLC control module comprises:
the chlorination PLC control module acquires the current frequency value of the chlorination pump;
if the current frequency value is less than or equal to the first boundary operation frequency value, the chlorination PLC control module controls the chlorination of the chlorination pump according to the first boundary operation frequency value;
if the current frequency value is greater than the second boundary operation frequency value, the chlorination PLC control module controls the chlorination of the chlorination pump according to the second boundary operation frequency value;
if the current frequency value is greater than or equal to the first boundary operation frequency value and less than the second boundary operation frequency value, the chlorination PLC control module controls the chlorination pump to add chlorine according to a third boundary operation frequency value, and the third boundary value is equal to the second boundary operation frequency value minus the first boundary operation frequency value and then divided by two.
4. The waterworks chlorination control method of claim 2, wherein the chlorination edge control module, before determining the target operating frequency interval of the chlorination pump based on a plurality of pre-set chlorination control strategy look-up tables and the operating data, comprises:
the chlorination edge control module uploads historical operation data acquired by the data acquisition module to the cloud computing platform, wherein the historical operation data comprises a historical inlet water flow value, a historical inlet water residual chlorine value, a historical inlet water temperature value, a historical medicament concentration value, a historical chlorination flow value and a historical operation frequency;
the cloud computing platform determines the plurality of preset chlorination control strategy comparison tables according to the historical operation data;
and the chlorination edge control module acquires the preset chlorination control strategy comparison tables issued by the cloud computing platform.
5. The method as claimed in claim 4, wherein the determining, by the cloud computing platform, the plurality of preset chlorination control strategy lookup tables according to the historical operating data comprises:
the cloud computing platform divides a historical water inlet flow value, a historical water inlet residual chlorine value, a historical water inlet water temperature value, a historical medicament concentration value and a historical chlorination flow value in the historical operating data respectively to obtain a plurality of operating data intervals;
and the cloud computing platform determines the preset chlorination control strategy comparison tables according to the comparison relationship between the operation data intervals and the output frequency intervals.
6. The method for controlling chlorination of tap water according to claim 5, wherein the determining the pre-set chlorination control strategy comparison table by the cloud computing platform according to the comparison relationship between the plurality of operation data intervals and the output frequency interval comprises:
the cloud computing platform divides each interval in the operation data interval into a plurality of interval sections;
the cloud computing platform analyzes the control time and the control fluctuation of the multiple sections to obtain control fluctuation indexes and control time indexes corresponding to the multiple sections respectively;
the cloud computing platform determines the section corresponding to the minimum control fluctuation index and the minimum control time index as an optimal section;
and the cloud computing platform determines the preset chlorination control strategy comparison table according to the frequency control range and the chlorination flow range in the optimal section and the comparison relationship between the multiple operation data sections and the output frequency section.
7. The method as claimed in claim 6, wherein the determining the preset chlorination control strategy comparison table by the cloud computing platform according to the frequency control range and the chlorination flow rate range in the optimal section and the comparison relationship between the plurality of operation data sections and the output frequency sections comprises:
the cloud computing platform acquires a chlorination flow measurement dead zone value and a water inlet residual chlorine flow measurement dead zone value of the chlorination control system of the water plant;
and the cloud computing platform determines the preset chlorination control strategy comparison table according to the chlorination flow measurement dead zone value, the residual chlorination flow measurement dead zone value, the frequency control range and the chlorination flow range of the optimal section, and the comparison relationship between the plurality of operation data sections and the output frequency section.
8. The water plant chlorination control method of claim 7 wherein the historical operating data includes historical operating feedback frequency; the cloud computing platform obtains the flow measurement dead zone value of the chlorination flow and the flow measurement dead zone value of the residual chlorine of the inlet water of the chlorination control system of the tap water plant, and comprises the following steps:
the cloud computing platform obtains a flow measurement dead zone value of the chlorination flow according to historical output frequency, historical chlorination flow value and historical operation feedback frequency in the historical operation data;
and the cloud computing platform obtains the flow measurement dead zone value of the inflow residual chlorine according to the historical output frequency, the historical inflow residual chlorine value and the historical operation feedback frequency in the historical operation data.
9. The chlorination control method of tap water plant according to claim 1, wherein the target control mode is an automatic switching mode; the chlorination PLC control module controls the chlorination pump to chlorinate according to the target control mode, and the chlorination PLC control module comprises:
in a preset chlorination time, the chlorination PLC control module controls the chlorination pump to chlorinate according to the master control mode, and records the effluent residual chlorine value in the preset chlorination time;
if the effluent residual chlorine value in the preset chlorination time is continuously smaller than the preset effluent residual chlorine value, the chlorination PLC control module is switched to the auxiliary control mode;
and the chlorination PLC control module controls the chlorination pump to chlorinate according to the auxiliary control mode.
10. A waterworks chlorination control system, comprising a data acquisition module, the chlorination PLC control module, a chlorination edge control module, and a cloud computing platform, wherein the data acquisition module is in bidirectional communication with the chlorination PLC control module, the chlorination PLC control module is in bidirectional communication with the chlorination edge control module, and the chlorination edge control module is in bidirectional communication with the cloud computing platform, wherein:
the chlorination PLC control module is used for receiving a chlorination control instruction, and the control instruction carries a target control mode identifier of the chlorination pump;
the chlorination PLC control module is used for selecting a target control mode from a preset control mode set according to the target control mode identification, and the preset control mode set comprises a main control mode, an auxiliary control mode and an automatic switching mode;
and the chlorination PLC control module is used for controlling the chlorination of the chlorination pump according to the target control mode.
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