Method for carrying out composite predictive control on coagulant dosage of water treatment

A predictive control and water treatment technology, applied in the fields of flocculation/sedimentation water/sewage treatment, adaptive control, general control system, etc., can solve the problems of uncertain objects, nonlinear coagulation process, complex control, etc., and achieve algorithm simplification , to facilitate the realization of the project, to improve the effect of real-time performance

Inactive Publication Date: 2012-07-04
SHENGDA ENVIRONMENTAL ENG CO LTD
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Problems solved by technology

[0010] The purpose of the present invention is to provide a compound predictive control method for water treatment coagulation and dosing to solve the complex control problems of nonlinear and uncertain objects in the coagulation process; because the source water quality sampling usually has a certain time interval, resulting in physical The problem of forecasting the water quality of the water source is required for the advanced item that cannot be realized

Method used

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  • Method for carrying out composite predictive control on coagulant dosage of water treatment
  • Method for carrying out composite predictive control on coagulant dosage of water treatment
  • Method for carrying out composite predictive control on coagulant dosage of water treatment

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specific Embodiment approach 1

[0061] like figure 1 As shown, using the composite predictive control model, by detecting the source water turbidity and effluent turbidity in the water treatment coagulation process, combined with the set value of the effluent water quality, input the composite predictive control model to obtain the real-time control amount of the water treatment coagulation dosage , the establishment of the compound predictive control model includes the following steps:

[0062] 1. Modeling of the coagulation process Using the principle of combining typical signal response and least squares, the internal disturbance model and external disturbance model of the coagulation process are established. The internal disturbance model uses the dosage as the input, and the turbidity of the coagulated water produced by water treatment The degree is the output, the external disturbance model uses the source water turbidity as the input, and the water treatment coagulation effluent turbidity as the outpu...

specific Embodiment approach 2

[0096]Specific Embodiment 2: This embodiment is an improvement on the basis of Embodiment 1. In practice, since the source water quality sampling usually has a certain time interval, leading items that cannot be physically realized appear, so it is necessary to carry out sampling of the source water The source water quality mainly considers the change of turbidity, and the turbidity forecast is to use the past and actual information of source water turbidity parameters to predict the future. Considering the project implementation using the AR model-based time series forecasting method:

[0097] x n = φ 1 x n-1 +...+φ p x n-p +ε n

[0098] where x n is the turbidity sequence, φ is the AR model coefficient, p is the model order, ε n for noise.

[0099] p order φ 1 ,...φ p A parameter can be identified by recursive least squares, so the application of the AR model can predict The sequence of k=1, 2, . . .

[0100] Step 4 in the implementation mode 1 is in concrete r...

specific Embodiment approach 3

[0104] Taking the application of compound predictive control on the simulated coagulation dosing device of a water plant as an example, the realization method is given.

[0105] 1. Measuring step response curve modeling

[0106] The change of water turbidity measured by the step change of dosage is shown in Table 1:

[0107] Table 1 Measured values ​​of drug dose flying experiment

[0108]

[0109] The change of water turbidity measured by source water turbidity step change is shown in Table 2:

[0110] Table 2 The measured values ​​of the turbidity soaring experiment

[0111]

[0112] According to the typical responses in Table 1 and Table 2 and the aforementioned modeling method, the internal disturbance model is obtained: G 1 ( s ) = - 1.04 ( 11.44 s ...

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Abstract

The invention provides a method for carrying out composite predictive control on coagulant dosage of water treatment and relates to a method for controlling coagulant dosage of water treatment, and the method can be used for solving the problem of complex control over nonlinear uncertain objects during a coagulation process. The method comprises the following specific steps of: establishing a composite predictive control model; through detecting the turbidity of untreated water and the turbidity of effluent during the coagulation process of water treatment and combining an effluent quality set value, inputting the turbidity of untreated water, the turbidity of effluent and the effluent quality set value into the composite predictive control model so as to solve the real-time control quantity of coagulant dosage of water treatment, wherein in the establishment of the composite predictive control model, the coagulant dosage of water treatment in a water plant is controlled by utilizing composite predictive control method of simplified DMC (Dynamic Matrix Control) and untreated water quality disturbance feed-forward predictive control, and the turbidity of untreated water during feed-forward control can be predicted by utilizing a time sequence predication method based on AR (Auto Regression) predication. According to the invention, the control accuracy is improved by utilizing the combination of simplified DMC and feed-forward predictive control, and the problem that sampling usually has a certain time interval is solved by utilizing the time sequence predication method based on AR predication; and the method provided by the invention can be used for controlling the coagulant dosage of water treatment in the water plant.

Description

technical field [0001] The invention discloses a compound predictive control method for coagulation and dosing in water treatment, and relates to the field of control methods for coagulation and dosing in water treatment. Background technique [0002] Coagulation is a key technology in the process of waterworks, which directly affects the quality of water produced by the waterworks, and the important factor affecting the coagulation effect is the dosage of coagulant. Accurate control of dosing can not only ensure the quality of effluent water, but also has great significance for reducing the cost of water production. At present, the following problems still exist in the dosing control: [0003] 1. In terms of coagulation detection, indirect detection of effluent turbidity is mainly based on flow current instruments and other instruments in China. Although it can quickly reflect changes in water turbidity, this instrument crosses various water quality parameters, so the anti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04C02F1/52
Inventor 齐维贵王民栋于德亮王林
Owner SHENGDA ENVIRONMENTAL ENG CO LTD
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