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Automatic control system and method for coal slime flocculation settling

An automatic control system, slime water technology, applied in the field of automatic control system and control of coal slime water flocculation sedimentation, coal slime water flocculation sedimentation control system and fuzzy control, can solve the problem of difficult to obtain stable control effect, feedback signal lag dosing time, The turbidity fluctuates up and down, etc., to overcome the unstable or even out-of-control control effect, improve the stability, and avoid the effect of deterioration

Inactive Publication Date: 2012-03-21
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Flocculation and settlement is a complex process, which is affected by many factors, especially the characteristics of large hysteresis. It takes a certain time for the fine coal particles suspended after adding flocculant to settle down, so the turbidity of overflow water is used as flocculant to add The feedback signal of the system will lag behind the dosing time, and it is often difficult to obtain a stable control effect when using it as a feedback amount to directly control the dosing, and it is easy to cause the turbidity to fluctuate, and it is also easy to cause waste of flocculants, and is used The problem of quantity control detection lag is always difficult to solve

Method used

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  • Automatic control system and method for coal slime flocculation settling
  • Automatic control system and method for coal slime flocculation settling
  • Automatic control system and method for coal slime flocculation settling

Examples

Experimental program
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Effect test

Embodiment approach 1

[0021] The system detects the real-time flow rate and real-time concentration value of the concentrator feed through the flow meter 4 and the concentration meter 5 on the local controller 1, and calculates the corresponding real-time initial addition of flocculant according to the flocculation and sedimentation agent system; the three-point turbidity The distribution detection device 2 is vertically installed on the clear water layer on the thickener, the first point is flush with the overflow hole of the thickener, the second point is 500mm away from the first point, and the third point is 1000mm away from the second point; The deviation between the turbidity value and the turbidity given value is used as one of the inputs of the fuzzy controller 3, and the turbidity gradient value calculated from the measured turbidity distribution is used as the second input of the fuzzy controller 3, and the speed control amount of the screw pump is As the output of the fuzzy controller 3, ...

Embodiment approach 2

[0023]The remote main control unit 8 receives the sensor parameters transmitted from the local controller 1 through the Ethernet communication module 7, and performs data analysis and flocculation and settlement effect analysis on the industrial computer of the remote main control unit 8. According to the analysis results, the fuzzy controller 3 The output coefficient fuzzy rules are adjusted, and the adjusted part is sent back to the local controller 1 by the Ethernet communication module 7, and the local controller 1 implements control after online parameter modification or rule modification. Others are the same as Embodiment 1.

Embodiment approach 3

[0025] The system uses a three-point turbidity distribution detection device 2 to obtain the turbidity distribution in the clear water layer on the concentrator, and uses the flow meter 4 and the concentration meter 5 to detect the real-time flow and real-time concentration values ​​of the concentrator feed, and these detection quantities are displayed on site for regulation The real-time display on the unit 9 also shows the dosage of flocculant corresponding to the output frequency of the frequency converter. Frequency manual intervention adjustment, increase or decrease the dosage of flocculant to ensure that the turbidity of circulating water reaches the standard. Others are the same as Embodiment 1.

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Abstract

The invention discloses an automatic control system and method for coal slime flocculation settling, which belongs to the technical field of mechatronics and control of mechatronics and particularly relates to a control system and a fuzzy control technology for coal slime flocculation settling on the basis of turbidity gradient detection of a thickener supernate layer. The invention provides an automatic control system and method for coal slime flocculation settling, which can be used for controlling overflow water turbidity to be stable and reach the standard and have the advantage of reducing flocculant consumption. According to the system, a three-point turbidity distribution detection device is used for detecting the turbidity distribution of the thickener supernate layer along the depth direction. According to the turbidity distribution condition, the turbidity space change rate along the supernate layer depth direction can be obtained; the change tendency of flocculation settling is predicted in an early stage; then, by taking the change tendency as one of the inputs of the fuzzy controller, fuzzy logic reasoning and in-time reasonable control can be implemented; and the problem that control effect is unstable, even out of control, because an overflow water turbidity feedback signal is seriously lagged can be overcome, and circulating water turbidity can be prevented from deteriorating. The system and the method disclosed by the invention are suitable for the coal slime flocculation settling processing of various coal preparation plants.

Description

technical field [0001] The automatic control system and control method of coal slime water flocculation and settlement of the present invention belong to the technical field of mechatronics and its control, and specifically relate to a coal slime water flocculation and settlement control system and fuzzy control technology based on the turbidity gradient detection of the clear water layer on the concentrator. Background technique [0002] Coal slime water treatment is a very important link in the production process of coal preparation plants, because the closed-circuit washing water circulation is the basic requirement that every coal preparation plant must meet, and the quality of coal slime water treatment will directly affect the separation equipment. Sorting effect, when the slime water system seriously deteriorates, it will cause the entire coal preparation plant to fail to operate normally or even stop production. [0003] Flocculation and sedimentation is the main pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/418C02F1/52
CPCY02P90/02
Inventor 杨洁明魏晋宏杨津灵李强姚李威
Owner TAIYUAN UNIV OF TECH
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