Apparatus and method for controlling chemical dosing optimization for water treatment plant

Patent metadata

Field	Value
Publication number	US-12528715-B2
Application number	US-202318149775-A
Country	US
Kind code	B2
Filing date	Jan 4, 2023
Priority date	Jan 6, 2022
Publication date	Jan 20, 2026
Grant date	Jan 20, 2026

Abstract

An apparatus for controlling chemical dosing optimization in a water treatment plant treating feed water includes: a control value derivation part configured to receive real-time data, analyze the real-time data through a water treatment model and a controller in response to receiving the real-time data, and calculate a control value, such that the control value is to set a minimum of a chemical dosage while maintaining a state of treated water of the water treatment plant in a normal range, the water treatment model simulating the water treatment plant and the controller being an optimization algorithm; and a chemical dosing output control part configured to provide the control value to a water treatment control device.

First claim

The invention claimed is:

1 . An apparatus for controlling chemical dosing optimization in a water treatment plant treating feed water, the apparatus comprising:
a control value derivation part configured to receive real-time data, analyze the real-time data through a water treatment model and a controller in response to receiving the real-time data, and calculate a control value for dosing a minimum of a chemical dosage into the feed water while maintaining a state of treated water of the water treatment plant in a range, the water treatment model simulating the water treatment plant and the controller being an optimization algorithm; a chemical dosing output control part configured to provide the control value to a water treatment control device; and the water treatment control device that controls injection of the minimum of the chemical dosage to the water treatment plant based on the control value, the control value being an input control parameter which is input into the water treatment control device, wherein a state of the feed water and the state of the treated water include at least one value of acidity indicated by pH, turbidity, residual iron, dissolved oxygen, nitrogen, mercury, phosphorus, carbon dioxide, or hydrogen ion concentration of the treated water, and the normal range is a predetermined value range of acidity indicated by pH, turbidity, residual iron, dissolved oxygen, nitrogen, mercury, phosphorus, carbon dioxide, or hydrogen ion concentration, wherein the control value derivation part comprises: a group control value derivation part configured to classify a plurality of control targets into a plurality of groups, and analyze group data of the real-time data through a for-group water treatment model for each group and the controller for each group, thereby, to calculate a for-group control value for each group; a part control value derivation part configured to divide each of the plurality of groups into a plurality of parts, and analyze part data of the real-time data with the for-group control value for each group as an initial value through a for-part water treatment model for each part and the controller for each part, thereby, to calculate a for-part control value for each part; and a unit control value derivation part configured to divide each of the plurality of parts into a plurality of units, and analyze unit data of the real-time data with the for-part control value for each part as an initial value through a for-unit water treatment model for each unit and the controller for each unit, thereby, to calculate a for-unit control value for each unit.

2 . The apparatus of claim 1 , wherein the water treatment model is configured to analyze the real-time data to calculate a prediction value for predicting the state of the treated water according to the state of the feed water for the water treatment plant, the treated water being discharged after the water treatment plant performs water treatment of the feed water, and
the controller is configured to refer to the prediction value to calculate the control value for dosing the minimum of the chemical dosage while maintaining the state of the treated water of the water treatment plant in the range.

3 . The apparatus of claim 1 , wherein the control value derivation part is configured to calculate, for each preset control period, the control value.

4 . The apparatus of claim 1 , wherein the unit control value derivation part is configured to, in response to ending of a control period before the for-unit control values for all of the units are calculated, use the for-group control value for each group or the for-part control value for each part calculated by a time point of the ending of the control period as the for-unit control value for each unit, and provide the for-unit control value for each unit substituting as a final for-unit control value to the chemical dosing output control part.

5 . The apparatus of claim 1 , wherein the group data is data
derived from real-time data corresponding to a group of control targets, from among the plurality of control targets, belonging to each group, the part data is data derived from the real-time data corresponding to a part of the control targets, from among the plurality of control targets, belonging to each part, and the unit data is data derived from the real-time data corresponding to a control target, from among the plurality of control targets, belonging to each unit.

6 . The apparatus of claim 1 ,
wherein the controller comprises a plurality of controller units, and the apparatus further comprising a controller selection management part configured to evaluate respective performances of the plurality of the controller units through simulation for the plurality of the controller units, and select any one of the plurality of the controller units according to the evaluation.

7 . The apparatus of claim 1 ,
wherein the water treatment model comprises a plurality of water treatment model units, the apparatus further comprising a model generation and management unit configured to select one water treatment model among the plurality of the water treatment model units based on a similarity to the water treatment plant, and provide the selected one water treatment model to the control value derivation part, each of the plurality of the water treatment model units simulating the water treatment plant and predicting the state of the treated water discharged after the water treatment plant performs water treatment of feed water for the water treatment plant, according to the state of the feed water.

8 . An apparatus for controlling chemical dosing optimization in a water treatment plant treating feed water, the apparatus comprising:
a controller selection management part configured to evaluate respective performances of a plurality of controllers through simulation for the plurality of controllers, and select the controller according to the evaluated performances; a control value derivation part configured to receive real-time data, analyze the real-time data through a water treatment model and the controller in response to receiving the real-time data, and calculate a control value for dosing a minimum of a chemical dosage into the feed water while maintaining a state of treated water of the water treatment plant in a range, the water treatment plant simulating the water treatment model and the controller being an optimization algorithm; and a water treatment control device that controls injection of the minimum of the chemical dosage to the water treatment plant based on the control value, the control value being an input control parameter which is input into the water treatment control device, wherein a state of the feed water and the state of the treated water include at least one value of acidity indicated by pH, turbidity, residual iron, dissolved oxygen, nitrogen, mercury, phosphorus, carbon dioxide, or hydrogen ion concentration of the treated water, and the range is a predetermined value range of acidity indicated by pH, turbidity, residual iron, dissolved oxygen, nitrogen, mercury, phosphorus, carbon dioxide, or hydrogen ion concentration, wherein the control value derivation part comprises: a group control value derivation part configured to classify a plurality of control targets into a plurality of groups, and analyze group data of the real-time data through a for-group water treatment model for each group and the controller for each group, thereby, to calculate a for-group control value for each group; a part control value derivation part configured to divide each of the plurality of groups into a plurality of parts, and analyze part data of the real-time data with the for-group control value for

Assignees

• Doosan Enerbility Co Ltd

Inventors

• Na Sang Gun
• Kim Hyun Sik
• Yoo Jun Woo
• Kim Yeong Hyeok
• Park Jung Won
• Lee Young Geun

Classifications

• G05D21/00

  Control of chemical or physico-chemical variables, e.g. pH value · CPC title

• B01D21/30

  Control equipment · CPC title

• C02F2209/006

  comprising a software program or a logic diagram · CPC title

• C02F2209/001

  Upstream control, i.e. monitoring for predictive control · CPC title

• C02F9/00

  Multistage treatment of water, waste water or sewage · CPC title