CN102385357B - Automatic control system and method for coal slime flocculation settling - Google Patents
Automatic control system and method for coal slime flocculation settling Download PDFInfo
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- CN102385357B CN102385357B CN2011102081086A CN201110208108A CN102385357B CN 102385357 B CN102385357 B CN 102385357B CN 2011102081086 A CN2011102081086 A CN 2011102081086A CN 201110208108 A CN201110208108 A CN 201110208108A CN 102385357 B CN102385357 B CN 102385357B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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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
Slurry water flocculation sedimentation automatic control system of the present invention and control method belong to mechano-electronic and control technology field thereof, are specifically related to a kind of slurry water flocculation settlement Control system and fuzzy control technology that detects based on thickener supernatant water layer turbidity gradient.
Background technology
It is a very important link in coal preparation plant's production technology that black water is processed, because closed water circuit is the basic demand that each coal preparation plant must reach, and black water is processed to such an extent that fine or notly also will directly have influence on the separating effect of screening installation, when the slime water system severe exacerbation, can cause whole coal preparation plant normally to move even to stop production.
Flocculating setting is the main technique that present black water is processed, and processing procedure is to be attached together by the small coal slime particle that adds flocculent solving liquid in black water, make the difficult sedimentation that is suspended in the black water, forms large floc sedimentation and rapid subsidence.Flocculating agent add to be take the turbidity of thickener overflow water as the control target, can not be excessive can not be not enough, if chemical feeding quantity is not enough, will cause incomplete sedimentation, make the overflow water turbidity too high, do not reach the index request of closed water circuit; If chemical feeding quantity is too much, not only waste a large amount of medicaments, and owing to mutual repulsion between agent molecule can make black water sedimentation effect variation on the contrary.Therefore the control method of flocculating agent interpolation is the key that guarantees the flocculating setting treatment effect.
Flocculating setting is the process of a complexity, be subject to the impact of many factors, the characteristics that particularly have large time delay, adding the duff grain that suspends behind the flocculating agent needs the regular hour just can settle down, so can lag behind administration timing of drug with the overflow water turbidity as the feedback signal of flocculating agent add-on system, using it as feedback quantity directly controls dosing and often is difficult to obtain stable control effect, be easy to cause turbidity fluctuated, also cause easily simultaneously the waste of flocculating agent, and the problem that the controlled volume detection lags behind is difficult to all the time solve.
Summary of the invention
The purpose of slurry water flocculation sedimentation automatic control system of the present invention and control method is, provide a kind of and can reach the closed water circuit index request, stablize to greatest extent the overflow water turbidity, and save flocculating setting automatic control system and the control method of flocculating agent consumption.
Slurry water flocculation sedimentation automatic control system of the present invention and control method are characterised in that this system is by local controller 1, bikini turbidity distribution detecting device 2, fuzzy controller 3, flowmeter 4, densimeter 5, the screw pump 6 of variable frequency control, ethernet communication module 7, long-range main control unit 8 and the on-the-spot regulation and control unit 9 that shows form, local controller 1 is for carrying out data acquisition and processing, flocculating agent addition initial value calculates, the Programmable Logic Controller PLC of fuzzy logic inference and control output, bikini turbidity distribution detecting device 2 is for detecting thickener supernatant water layer along the sensor group of the turbidity distribution situation of depth direction, fuzzy controller 3 be a kind of based under clear water layer surface haze and the clear water layer surface along the fuzzy logic inference controller of turbidity graded on the depth direction, flowmeter 4 is for obtaining the electromagnetic sensor of thickener pan feeding flow, densimeter 5 is for obtaining the ultrasonic sensor of thickener pan feeding concentration, the topworks that the screw pump 6 of variable frequency control adds for flocculating agent, ethernet communication module 7 is the device that passes mutually the data and instruction between local controller 1 and the long-range main control unit 8, long-range main control unit 8 is that the Flocculation Settling Process technological parameter shows and storage in real time, data analysis and processing, the fuzzy model parameter adjustment, industrial control computer and the display terminal of remote auto/manually control, but on-the-spot demonstration regulation and control unit 9 is the on-the-spot device that shows in real time each technological parameter of Flocculation Settling Process and control parameter and manual intervention control output.
Slurry water flocculation sedimentation automatic control system of the present invention and control method are characterised in that, bikini turbidity distribution detecting device 2 is to be installed on interior three the complementary photoelectric sensors of multiple beam along the black water depth direction of thickener, corresponding three check points in the installation site of its three sensors, the first check point is concordant with thickener spout hole position, the second check point is apart from the first check point 400-600mm, and the 3rd check point is apart from the first check point 800-1200mm.Can detect the turbidity distribution situation of thickener supernatant water layer surface to the 1200mm depth distance by it, because distributing, supernatant water layer turbidity can not suddenly change, so can foresee in early days the variation tendency of flocculating setting from this turbidity distribution situation, and according to the early stage rational control of this trend enforcement, overcome the control effect problem unstable even out of control that overflow water turbidity signal lag is brought.
Slurry water flocculation sedimentation automatic control system of the present invention and control method are characterised in that, fuzzy controller 3 is systems of one two input, wherein one of input is the deviation of turbidity value and the turbidity set-point of the first check point in the bikini turbidity distribution detecting device 2, two of input is the turbidity gradients that calculated by the turbidity Distribution Value on three check points arranging along clear water layer depth direction, the essential distinction of the deviation variation rate that this and conventional fuzzy controller are inputted is, the deviation variation rate of conventional fuzzy controller input is the variation of the temporal deviation of double sampling, it belongs to the rate of change on the time domain, and among the present invention fuzzy controller 3 input be spatial variations rate along turbidity on the clear water layer depth direction.The computing method of turbidity gradient described herein are: the slope of asking (a), first the 3rd check point turbidity value and the second check point turbidity value; (b), ask again the slope of the second check point turbidity value and the first check point turbidity value; (c), ask above-mentioned (a) and (b) difference to obtain the direction of turbidity gradient, ask above-mentioned (a) and average (b) to obtain the size of turbidity gradient.
Slurry water flocculation sedimentation automatic control system of the present invention and control method are characterised in that, this system first measured value by flowmeter 4 and densimeter 5 on local controller 1 calculates corresponding to the first dosage of the flocculating agent of thickener pan feeding according to the regime of agent of flocculating setting; Then the thickener supernatant water surface haze that bikini turbidity distribution detecting device 2 is obtained and from clear water layer surface to along the turbidity gradient in depth direction 800-1200mm scope input fuzzy controller 3, with the screw pump rotating speed as output, input, output can be divided into 5-7 fringe, membership function is got the triangular function form, under this fuzzy division, make corresponding fuzzy rule, obtain increment or the decrement of flocculating agent interpolation by the fuzzy logic inference rule of fuzzy controller 3; After the first dosage of flocculating agent last and that previous calculations obtains is superimposed, be converted to the output frequency of frequency converter, the rotating speed of control motor comes the flow of adjusting screw(rod) pump 6 to carry out dosing.Regime of agent described above refers to that the black water with the industry spot special properties is object, makes the relation curve between different medicament proportionings and consumption and the coal slime settling speed in the laboratory, the best rationally chemical feeding quantity of then determining.After long-range main control unit 8 receives each sensor parameters that local controller 1 transmits by ethernet communication module 7, carry out data analysis and flocculating setting effect analysis, and according to analysis result fuzzy controller 3 is carried out model parameter correction and rule adjustment, if the first check point supernatant water turbidity value long-time continuous forward exceeds standard, then heighten the output quantity coefficient of fuzzy controller 3, otherwise then oppositely regulate; When if the turbidity gradient obviously increases continuously, then revise fuzzy output rule list.These regulated quantitys are passed local controller 1 back by ethernet communication module 7, and enforcement was controlled after local controller 1 carried out on-line parameter modification or rules modification, the impact that changes and bring to improve control effect and adaptation ature of coal.
Slurry water flocculation sedimentation automatic control system of the present invention and control method are characterised in that, on-the-spot show regulation and control unit 9 be one with the Single Chip Microcomputer (SCM) system of RS485 interface, the frequency converter frequency parameter of the pan feeding flow of the Flocculation Settling Process that reception is transmitted by local controller 1, pan feeding concentration, thickener supernatant water layer turbidity distribution parameter and control screw pump motor also shows that in real time the frequency converter frequency when allowing simultaneously the site operation personnel to carry out abnormal condition is emergent to be regulated.
Slurry water flocculation sedimentation automatic control system of the present invention is by following mode work:
System detects real-time traffic and the real-time concentration value of thickener pan feeding by flowmeter 4 and densimeter 5 on local controller 1, and calculate the in real time first dosage of corresponding flocculating agent according to the regime of agent of flocculating setting; Then the turbidity gradient in the following 800-1200mm scope of thickener supernatant water surface haze and clear water layer surface that obtains according to bikini turbidity distribution detecting device 2, input fuzzy controller 3, with the output of screw pump spin rate control quantity as fuzzy controller 3, input, output can be divided into 5-7 fringe, and membership function is got the triangular function form.Under this fuzzy division, formulate fuzzy rule, obtain increment or the decrement that flocculating agent adds by fuzzy logic inference; The first dosage of flocculating agent last and that previous calculations goes out is superimposed, is converted to the output frequency of frequency converter, and the rotating speed of control motor comes the flow of adjusting screw(rod) pump 6 to carry out dosing.
All parameters that ethernet communication module 7 collects local controller 1 send long-range main control unit 8 to; The enterprising line number of the industrial computer of long-range main control unit 8 according to one's analysis with the flocculating setting effect analysis, according to analysis result the output coefficient fuzzy rule of fuzzy controller 3 is adjusted, adjustment member is passed local controller 1 back by ethernet communication module 7, local controller 1 carries out implementing control, the impact that changes and bring to adapt to ature of coal behind on-line parameter modification or the rules modification.
Slurry water flocculation sedimentation automatic control system of the present invention and control method have following advantage:
1, use bikini turbidity distribution detecting device 2 at right angle settings in thickener supernatant water layer, the turbidity that detects in real time thickener supernatant water layer distributes, can foresee in early days the trend of flocculating setting from the turbidity distribution situation that detects, and implement in time reasonably control according to this trend by fuzzy controller, overcome the control effect problem unstable even out of control that overflow water turbidity signal lag is brought, avoided the deterioration of turbidity of circulating water.This control mode obviously improves the stability of turbidity of circulating water.
2, local controller 1 all has relative independence with the on-the-spot regulation and control unit 9 that shows, data analysis processing and the fuzzy model correction of long-range main control unit 8 can adapt to the impact that ature of coal changes and brings, and such framework makes the adaptability of control system and robustness stronger.
Description of drawings
Fig. 1 is slurry water flocculation sedimentation automatic control system structural drawing
Fig. 2 is slurry water flocculation sedimentation automatic control system theory diagram
Among the figure: 1: local controller, 2: bikini turbidity distribution detecting device, 4: flowmeter, 5: densimeter, 6: screw pump, 7: ethernet communication module, 8: long-range main control unit, 9: the on-the-spot regulation and control unit that shows
Embodiment:
System detects real-time traffic and the real-time concentration value of thickener pan feeding by flowmeter 4 and densimeter 5 on local controller 1, and calculate the in real time first dosage of corresponding flocculating agent according to the regime of agent of flocculating setting; Bikini turbidity distribution detecting device 2 at right angle settings are in thickener supernatant water layer, and first concordant with thickener spout hole position, and second point is positioned at apart from first 500mm, thirdly apart from second point 1000mm; With the deviation of the turbidity value of the first check point and turbidity set-point as one of input of fuzzy controller 3, distribute from the turbidity that records and to calculate the turbidity Grad as two of the input of fuzzy controller 3, with the output of screw pump spin rate control quantity as fuzzy controller 3, input, output all can be divided into 7 fringes, namely honest (PB), center (PM), just little (PS), zero (Z), negative little (NS), negative in (NM), negative large (NB), membership function is got the triangular function form.Under this fuzzy division, formulate 49 fuzzy rules, as: if the deviation of the turbidity value of the first check point and turbidity set-point is honest (PB), turbidity Grad when also being honest (PB), then output speed is honest (PB).Obtain increment or the decrement that flocculating agent adds by such fuzzy logic inference rule; The first dosage of flocculating agent last and that previous calculations goes out is superimposed, is converted to the output frequency of frequency converter, and the rotating speed of control motor comes the flow of adjusting screw(rod) pump 6 to carry out dosing.
Receive each sensor parameters that local controller 1 transmits by long-range main control unit 8 by ethernet communication module 7, the enterprising line number of the industrial computer of long-range main control unit 8 according to one's analysis with the flocculating setting effect analysis, according to analysis result the output coefficient fuzzy rule of fuzzy controller 3 is adjusted, adjustment member is passed local controller 1 back by ethernet communication module 7, and local controller 1 carries out implementing control behind on-line parameter modification or the rules modification.Other is with embodiment 1.
Embodiment 3
System obtains turbidity distribution situation in the thickener supernatant water layer with bikini turbidity distribution detecting device 2, detect real-time traffic and the real-time concentration value of thickener pan feeding with flowmeter 4 and densimeter 5, these detection limits show at the scene on the regulation and control unit 9 and show in real time, also show simultaneously by flocculating agent dosage corresponding to frequency converter output frequency, when Accidental occurrence overflow water turbidity is not up to standard, the site operation personnel can show at the scene that carrying out the frequency converter output frequency on the regulation and control unit 9 manually intervenes adjusting, increase and decrease flocculating agent dosage, up to standard to guarantee turbidity of circulating water.Other is with embodiment 1.
Claims (5)
1. slurry water flocculation sedimentation automatic control system, it is characterized in that this system is by local controller (1), bikini turbidity distribution detecting device (2), fuzzy controller (3), flowmeter (4), densimeter (5), the screw pump of variable frequency control (6), ethernet communication module (7), long-range main control unit (8) and the on-the-spot regulation and control unit (9) that show form, local controller (1) is for carrying out data acquisition and processing, flocculating agent addition initial value calculates, the Programmable Logic Controller PLC of fuzzy logic inference and control output, bikini turbidity distribution detecting device (2) is for detecting thickener supernatant water layer along the sensor group of the turbidity distribution situation of depth direction, fuzzy controller (3) be a kind of based under clear water layer surface haze and the clear water layer surface along the fuzzy logic inference controller of turbidity graded on the depth direction, flowmeter (4) is for obtaining the electromagnetic sensor of thickener pan feeding flow, densimeter (5) is for obtaining the ultrasonic sensor of thickener pan feeding concentration, the topworks that the screw pump of variable frequency control (6) adds for flocculating agent, ethernet communication module (7) is the device that passes mutually the data and instruction between local controller (1) and the long-range main control unit (8), long-range main control unit (8) is that the Flocculation Settling Process technological parameter shows and storage in real time, data analysis and processing, the fuzzy model parameter adjustment, industrial control computer and the display terminal of remote auto/manual control, on-the-spot demonstration are regulated and control unit (9) but are that the scene shows in real time each technological parameter of Flocculation Settling Process and controls the also device of manual intervention control output of parameter.
2. slurry water flocculation sedimentation automatic control system as claimed in claim 1, it is characterized in that bikini turbidity distribution detecting device (2) is to be installed on interior three the complementary photoelectric sensors of multiple beam along the black water depth direction of thickener, corresponding three check points in the installation site of its three sensors, the first check point is concordant with thickener spout hole position, the second check point is apart from the first check point 400-600mm, and the 3rd check point is apart from the first check point 800-1200mm.
3. slurry water flocculation sedimentation automatic control system as claimed in claim 1, it is characterized in that fuzzy controller (3) is the system of one two input, wherein one of input is the deviation of turbidity value and the turbidity set-point of the first check point in the bikini turbidity distribution detecting device (2), and two of input is the turbidity gradients that calculated by the turbidity Distribution Value on three check points arranging along clear water layer depth direction.
4. the control method of slurry water flocculation sedimentation automatic control system claimed in claim 1, it is characterized in that on local controller (1), passing through first the measured value of flowmeter (4) and densimeter (5), regime of agent according to flocculating setting calculates corresponding to the first dosage of the flocculating agent of thickener pan feeding, then the thickener supernatant water surface haze that bikini turbidity distribution detecting device (2) is obtained and from clear water layer surface to the input of the turbidity gradient in depth direction 800-1200mm scope fuzzy controller (3), fuzzy logic inference rule by fuzzy controller (3) obtains increment or the decrement that flocculating agent adds, the flocculating agent that obtains with previous calculations more just dosage superimposed after, be converted to the output frequency of frequency converter, carry out dosing by screw pump (6) the realization flow regulation of variable frequency control; After long-range main control unit (8) receives each sensor parameters that local controller (1) transmits by ethernet communication module (7), carry out data analysis and flocculating setting effect analysis, and according to analysis result fuzzy controller (3) is carried out model parameter correction and rule adjustment, to improve the control effect and to adapt to the impact that ature of coal changes and brings.
5. the control method of slurry water flocculation sedimentation automatic control system as claimed in claim 4, it is characterized in that on-the-spot show regulation and control unit (9) be one with the Single Chip Microcomputer (SCM) system of RS485 interface, the frequency converter frequency parameter of the pan feeding flow of the Flocculation Settling Process that reception is transmitted by local controller (1), pan feeding concentration, thickener supernatant water layer turbidity distribution parameter and control screw pump motor also shows that in real time the frequency converter frequency when allowing simultaneously the site operation personnel to carry out abnormal condition is emergent to be regulated.
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| CN2011102081086A CN102385357B (en) | 2011-07-25 | 2011-07-25 | Automatic control system and method for coal slime flocculation settling |
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| CN103214069A (en) * | 2013-04-25 | 2013-07-24 | 佛山市绿建环保科技有限公司 | Control system for automatic chemical dosing in flocculation process |
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| CN105446207A (en) * | 2014-09-30 | 2016-03-30 | 金华市恒飞电工材料有限公司 | Control system for automatic feeding of flocculating agent in electroplating waste water treatment |
| CN106325236B (en) * | 2015-08-11 | 2020-05-22 | 泰戈特（北京）工程技术有限公司 | Design method of centralized control system of coal preparation plant |
| CN105174402B (en) * | 2015-09-24 | 2017-08-11 | 安徽理工大学 | A kind of automatic adding flocculant system settled for black water and its method |
| CN110082267A (en) * | 2019-04-23 | 2019-08-02 | 武汉科技大学 | It is a kind of to measure the method and its application that flocculant concentration is remained in ore dressing return water |
| CN114167923B (en) * | 2021-12-07 | 2022-10-11 | 长沙矿山研究院有限责任公司 | Tailing flocculation sedimentation intelligent adjusting system and method |
| CN114307264A (en) * | 2021-12-17 | 2022-04-12 | 中国矿业大学 | Device and method for rapidly detecting height of clarified water layer of slime water thickener |
| CN114477710B (en) * | 2021-12-22 | 2022-11-11 | 镇江市给排水管理处 | Dewatering system and method for automatically optimizing flocculation-macroporous anti-blocking regenerated filter mass |
| CN115072850B (en) * | 2022-08-16 | 2022-11-18 | 山东仲良格环保技术有限公司 | Intelligent optimization control method and PAC (programmable automation controller) dosing control system based on same |
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