WO2013065894A1

WO2013065894A1 - Apparatus and method for automatically controlling the introduction of chemicals for water quality control

Info

Publication number: WO2013065894A1
Application number: PCT/KR2011/008998
Authority: WO
Inventors: 김성진; 오용석; 김대경; 윤용철
Original assignee: Kim Sung Jin; Oh Yong Seok; Kim Dae Kyeong; Yoon Yong Cheol
Priority date: 2011-11-04
Filing date: 2011-11-23
Publication date: 2013-05-10
Also published as: KR20130049666A

Abstract

Disclosed are an apparatus and method for automatically controlling the introduction of chemicals. Embodiments of the present invention relate to a control method for determining the suitable amount of chemicals to introduce according to the ever changing quality of water in a water storage tank and controlling the introduction of chemicals in the water storage tank, and thus relate to a technology which promotes convenience for the manager of a water and sewage facility or the like, and simultaneously enables water quality control to be stably performed.

Description

Automatic chemical input device and method for water quality management

Embodiments of the present invention relate to techniques for effectively injecting drugs in a control system for inputting drugs that operate in water and sewage facilities.

Recently, the importance of water is being emphasized as water shortage occurs around the world. In particular, the importance of drinking water directly connected to life is emphasized.

Usually, each country operates water and sewage facilities to supply water to homes and buildings. The water and sewage facility is configured to collect water in a predetermined reservoir, and then put a predetermined chemical into the water stored in the reservoir to perform water purification, and then supply it to a home or a building.

In water and sewage facilities, the chemical treatment process to purify water is one of the important parts because it is directly related to human health. Therefore, there is a need to accurately perform the chemical treatment process for water purification.

In general, water and sewage facilities often have a control system in place to control the treatment of chemicals stored in the reservoir.

However, such a control system is often configured to allow the manager to directly check the water quality change occurring as the water flows into and out of the reservoir in real time to directly determine the chemical input amount.

Therefore, in such a control system, when the manager neglects the management, the chemicals are not correctly injected into the reservoir, and thus the water quality of water, which is directly connected to the health of the person, may be degraded.

For this reason, there is an increasing need for a research on a control system for controlling a chemical input into the reservoir by determining an appropriate chemical input amount according to the water quality of the water that changes from time to time without a manager's management.

Embodiments of the present invention by providing a control technique for controlling the input of the chemical to the reservoir by determining the appropriate chemical input amount according to the water quality of the water from the reservoir to the water at any time, to facilitate the management of the water and sewage facilities and at the same time stable water quality management To be performed.

Automatic chemical input device according to an embodiment of the present invention is a water quality measuring unit for measuring the water quality of the water stored in the reservoir, a target value for calculating the target value of the chemical input to be added to the reservoir based on the measured water quality of the water It includes a calculation unit, a medicine amount determination unit for determining the amount of medicine to be injected into the reservoir based on the calculated drug input target value, and a medicine input control unit for controlling the drug input to the reservoir based on the determined amount of medicine.

In addition, the automatic drug input control method according to an embodiment of the present invention is the step of measuring the water quality of the water stored in the reservoir, the step of calculating the target value of the drug to be added to the reservoir based on the water quality of the measured water And determining the amount of medicine to be added to the reservoir based on the calculated medicine input target value and controlling the medicine input to the reservoir based on the determined amount of medicine.

Embodiments of the present invention by providing a control technique for controlling the input of the chemical to the reservoir by determining the appropriate chemical input amount according to the water quality of the water from the reservoir to the water at any time, to facilitate the management of the water and sewage facilities and at the same time stable water quality management May be assisted to be performed.

1 is a view showing the structure of the automatic drug input control device according to an embodiment of the present invention.

2 is a view for explaining the operation of the automatic drug input control device according to an embodiment of the present invention.

3 is a flowchart illustrating a method for automatically controlling chemical input according to an embodiment of the present invention.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the drawings, similar reference numerals are used for similar elements.

When a component is said to be "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that another component may be present in the middle. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present disclosure does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Referring to Figure 1, the drug input automatic control device 110 and the reservoir 120 is shown.

First, the water reservoir 120 is stored in the water to be purified through the input of the drug, the water is purified water can exit the reservoir 120, the water to be purified newly flows into the reservoir 120 Can be.

Automatic drug input control device 110 according to an embodiment of the present invention includes a water quality measuring unit 111, a target value calculation unit 112, a drug amount determining unit 113 and a drug input control unit 114.

The water quality measuring unit 111 measures the water quality of the water stored in the reservoir 120.

In this case, the water quality measuring unit 111 may measure the water quality of the water based on the pH, turbidity, temperature, alkalinity, chlorine demand, or chromaticity of the water.

The target value calculator 112 calculates a chemical input target value to be added to the reservoir 120 based on the measured water quality.

At this time, according to an embodiment of the present invention, the drug input automatic control device 110 may further include a database (115).

The database 115 stores a plurality of drug input target value information corresponding to each of the plurality of water quality information for each of the plurality of water quality information and the plurality of water quality information.

At this time, the target value calculator 112 extracts the medicine input target value information corresponding to the water quality information of the measured water quality from the database 115 to the reservoir 120 based on the extracted medicine input target value information. The target value of drug input to be injected can be calculated.

For example, "drug quality input target value 1" is stored in the database 111 so as to correspond to "drug quality 1", and "drug quality input target value 2" is stored in correspondence with "water quality 2". As a result of the 111 measuring the water quality of the water stored in the reservoir 120, when the measured water quality is "water quality 2", the target value calculating unit 112 corresponds to "water quality 2" from the database 111. By extracting the "drug input target value 2" it is possible to calculate the chemical input target value to be injected into the reservoir (120).

The chemical amount determining unit 113 determines the amount of chemical to be injected into the reservoir 120 based on the calculated chemical input target value.

At this time, according to an embodiment of the present invention, the drug amount determining unit 113 may include a feedback unit 116 and a PID (Proportional Integral Derivative) control unit 117.

The feedback unit 116 receives feedback about the amount of medicine that is pre-injected into the reservoir 120.

The PID control unit 117 determines the amount of medicine to be injected into the reservoir 120 by performing PID control based on the calculated medicine input target value and information on the amount of medicine previously added to the reservoir 120.

PID control is a kind of feedback control that maintains the output value of the system based on the error between the control variable and the reference input. Proportional control, Proportional-Integral control, Proportional derivative Derivative) means a combination of control.

First, proportional control is to create a control signal by multiplying the error signal between the reference signal and the current signal by an appropriate proportional constant gain, and proportional integration control is used by connecting the integral control in parallel to the proportional control to integrate the error signal to create a control signal. Proportional derivative control means using differential control in parallel to proportional control, which makes a control signal by differentiating an error signal.

PID control is a control method used not only to measure reaction of automation system but also to control reaction. It is used to control temperature, pressure, flow rate, rotation speed, etc. It is a technique that can be improved.

In this regard, the automatic drug input control device 110 according to an embodiment of the present invention, the target value calculation unit 112 calculates the chemical input target value to be injected into the reservoir 120, the feedback unit 116 is When the reservoir 120 receives feedback on the amount of chemicals already added, the PID controller 117 performs PID control based on the target value of the chemical input and the information on the amount of chemicals previously added to the reservoir 120. The amount of chemicals to be added to the reservoir 120 can be determined.

In relation to this, with reference to Figure 2 will be described in more detail the operation of the automatic drug input control device 110 according to an embodiment of the present invention.

2 is a view for explaining the operation 110 of the automatic drug input control device according to an embodiment of the present invention.

First, reference numeral 210 shows a graph of the trend of the cumulative amount of chemicals injected into the reservoir 120 through PID control, and reference numeral 220 is input to the reservoir 120 according to time determined by the PID controller 117. A graph of the trend of drug quantity to be shown is shown.

As shown by reference numeral 210, the target value calculator 112 completes the calculation of the final chemical input target value to be added to the reservoir 120, and the feedback unit 116 is pre-injected into the reservoir 120. Upon receiving feedback on the amount of medicine, the PID control unit 117 performs PID control based on the information on the medicine input target value and the information on the amount of medicine pre-injected into the reservoir 120 to perform the medicine input goal for each time. In order to achieve the value, it is possible to determine the amount of chemical to be injected into the reservoir 120.

For this reason, as shown by the reference numeral 210, as the time passes, the accumulated amount of the drug injected into the reservoir 120 may gradually converge to the final drug input target value.

On the other hand, as shown in the reference numeral 220, as time passes, the accumulated amount of the drug injected into the reservoir 120 converges to the medicine input target value, so that the PID controller 117 determines the time-dependent reservoir 120. The amount of drug to be injected may be reduced.

In general, the reservoir 120 may escape the purified water, and since the water to be purified may be introduced into the reservoir 120, the water quality of the water stored in the reservoir 120 may change at any time. .

In this regard, according to an embodiment of the present invention, the water quality measurement unit 111 may measure the water quality of the water stored in the reservoir 120 at predetermined time intervals.

In this case, the target value calculator 112 may update the medicine input target value based on the changed water quality whenever the water quality of the water is changed.

At this time, according to an embodiment of the present invention, the PID control unit 117, when the drug input target value is updated, the information on the updated drug input target value and the amount of chemicals previously added to the reservoir 120 The PID control parameter associated with the PID control may be reset based on the above, and the PID control may be performed based on the reset PID control parameter to determine the amount of chemical to be injected into the reservoir 120.

If the water quality of the water stored in the reservoir 120 is changed, the drug input target value to be injected should also be changed. At this time, when the drug input target value is different, since the drug input target value shown by reference numeral 210 of FIG. 2 is different, the PID control unit 117 resets the PID control parameter to control the PID based on the reset PID control parameter. There is a need to perform this.

Therefore, according to one embodiment of the present invention, the PID control unit 117, when the drug input target value is updated, the updated drug input target value and the information on the amount of the drug that is pre-injected into the reservoir 120 The PID control parameter associated with the PID control may be reset based on the above, and the PID control may be performed based on the reset PID control parameter to determine the amount of chemical to be injected into the reservoir 120.

In addition, according to an embodiment of the present invention, the PID control unit 117 may perform PID control in consideration of the gain and disturbance requirements of the PID control unit 117, and the fuzzy and neural network in connection with resetting the PID control parameters. Genetic algorithms can be applied.

When the amount of medicine to be injected into the reservoir 120 is determined by the medicine amount determining unit 113, the medicine input control unit 114 controls the input of the medicine to the reservoir 120 based on the determined amount of medicine.

According to an embodiment of the present invention, the drug input automatic control device 110 may further include a display unit 118.

The display unit 118 is a water tank determined by the water quality of the water measured by the water quality measuring unit 111, the target value of chemicals calculated by the target value calculating unit 112, the PID control parameter associated with the PID control, and the chemical amount determining unit 113. 120) Display the amount of chemical to be added.

As a result, the automatic drug input control device 110 according to an embodiment of the present invention determines the appropriate chemical input amount according to the water quality of the water changes from time to time in the reservoir 120 to control the chemical input to the reservoir 120 By providing a technique, it is possible to facilitate the management of water and sewage facilities, and to support stable water quality management.

In step S310 to measure the water quality of the water stored in the reservoir.

In step S320, the target value of chemicals to be added to the reservoir is calculated based on the measured water quality.

At this time, according to an embodiment of the present invention, the automatic drug input control method before step (S320) for each of the plurality of water quality information and the water quality information of the plurality of water for each of the water quality information of the plurality of water The method may further include managing a database in which corresponding plurality of drug input target value information is stored.

At this time, in step (S320) to extract the medicine input target value information corresponding to the water quality information on the measured water quality from the database, the medicine input target to be added to the reservoir based on the extracted medicine input target value information Can compute a value.

In step S330, the amount of medicine to be added to the reservoir is determined based on the calculated medicine input target value.

At this time, according to an embodiment of the present invention, in step (S330), the step of receiving feedback on the information on the amount of chemicals previously added to the reservoir and the calculated chemical input target value and the amount of chemicals previously added to the reservoir The method may further include determining a chemical amount to be added to the reservoir by performing PID control on the basis of the information.

In addition, according to an embodiment of the present invention, in step S310, the water quality of the water is measured at a predetermined time interval, and in step S320, whenever the water quality of the water is changed, the water based on the changed water quality. Drug input target value can be updated.

At this time, according to one embodiment of the present invention, the step of determining the drug amount to be injected into the reservoir by performing the PID control, if the drug input target value is updated, the updated drug input target value and the reservoir Resetting a PID control parameter associated with the PID control on the basis of the information on the amount of chemicals already added, and performing the PID control on the basis of the reset PID control parameter to determine the amount of chemical to be injected into the reservoir. It may include a step.

In step S340, the chemical input to the reservoir is controlled based on the determined chemical amount.

According to an embodiment of the present invention, the automatic drug input control method displays the water quality of the measured water, the calculated drug input target value, the PID control parameter and the amount of chemicals to be added to the reservoir after step S330. It may further comprise the step.

In the above, with reference to Figure 3 was described for the automatic drug input control method according to an embodiment of the present invention. Here, the automatic drug input control method according to an embodiment of the present invention may correspond to the configuration of the automatic drug input control device 110 described with reference to FIGS. 1 and 2, a detailed description thereof will be omitted. do.

The method for automatically controlling medicine input according to an embodiment of the present invention may be implemented in the form of program instructions that may be executed by various computer means and may be recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer readable recording media include magnetic media such as hard disks, floppy disks and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

In the present invention as described above has been described by the specific embodiments, such as specific components and limited embodiments and drawings, but this is provided to help a more general understanding of the present invention, the present invention is not limited to the above embodiments. For those skilled in the art, various modifications and variations are possible from these descriptions.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and all the things that are equivalent to or equivalent to the claims as well as the following claims will belong to the scope of the present invention. .

Claims

A water quality measurement unit for measuring the water quality of water stored in the reservoir;

A target value calculator for calculating a medicine input target value to be added to the reservoir based on the measured water quality;

A chemical amount determining unit determining a chemical amount to be added to the reservoir based on the calculated chemical input target value; And

Chemical input control unit for controlling the chemical input to the reservoir based on the determined chemical amount

Chemical input automatic control device comprising a.
The method of claim 1,

A database in which a plurality of drug input target value information corresponding to each of the plurality of water quality information is stored for each of the plurality of water quality information and the plurality of water quality information

More,

The target value calculator

Automatic medicine input to extract the medicine input target value information corresponding to the water quality information on the measured water quality from the database and calculate a medicine input target value to be added to the reservoir based on the extracted medicine input target value information controller.
The method of claim 1,

The drug amount determination unit

A feedback unit for receiving feedback on the amount of medicine that is pre-injected into the reservoir; And

PID control unit for determining the amount of chemicals to be injected into the reservoir by performing PID (Proportional Integral Derivative) control based on the calculated chemical input target value and the information on the amount of chemicals previously added to the reservoir

Chemical input automatic control device comprising a.
The method of claim 3,

The water quality measurement unit

Measure the water quality of the water at predetermined time intervals,

The target value calculator is

Whenever the water quality of the water is changed, the automatic drug input control device for updating the medicine input target value based on the water quality of the changed water.
The method of claim 4, wherein

The PID control unit

When the medicine input target value is updated, the PID control parameter associated with the PID control is reset based on the updated medicine input target value and information on the amount of medicine previously added to the reservoir, and the reset PID control. The automatic drug input control device for determining the chemical amount to be put into the reservoir by performing the PID control based on a parameter.
The method of claim 5,

A display unit for displaying the water quality of the measured water, the calculated drug input target value, the PID control parameter and the amount of medicine to be added to the reservoir

Drug input automatic control device further comprising.
Measuring the water quality of the water stored in the reservoir;

Calculating a medicine input target value to be added to the reservoir based on the measured water quality;

Determining an amount of medicine to be added to the reservoir based on the calculated medicine input target value; And

Controlling the chemical input to the reservoir based on the determined chemical amount

Chemical input automatic control method comprising a.
The method of claim 7, wherein

Managing a database in which a plurality of drug input target value information corresponding to each of the plurality of water quality information is stored for each of the plurality of water quality information and the plurality of water quality information

More,

Computing the drug input target value

Automatic medicine input to extract the medicine input target value information corresponding to the water quality information on the measured water quality from the database and calculate a medicine input target value to be added to the reservoir based on the extracted medicine input target value information Control method.
The method of claim 7, wherein

Determining the amount of medicine to be added to the reservoir

Receiving feedback on the amount of chemicals that have been added to the reservoir tank; And

Determining the amount of chemical to be injected into the reservoir by performing PID (Proportional Integral Derivative) control based on the calculated chemical input target value and information on the amount of chemical previously added to the reservoir.

Chemical input automatic control method comprising a.
The method of claim 9,

Measuring the water quality of the water

Measure the water quality of the water at predetermined time intervals,

Computing the drug input target value

Whenever the water quality of the water is changed, automatic drug input method for updating the medicine input target value based on the water quality of the changed water.
The method of claim 10,

Determining the amount of chemical to be put into the reservoir by performing the PID control

Resetting a PID control parameter associated with the PID control based on the updated medicine input target value and information on the amount of medicine previously added to the reservoir when the medicine input target value is updated; And

Determining the amount of medicine to be put into the reservoir by performing the PID control based on the reset PID control parameters

Chemical input automatic control method comprising a.
The method of claim 11,

Displaying the measured water quality, the calculated chemical input target value, the PID control parameter, and the quantity of chemical to be added to the reservoir.

Drug input automatic control method further comprising a.
A computer-readable recording medium having recorded thereon a program for performing the method of any one of claims 7 to 12.