CN105159092A - Fuzzy control method used for ash cleaning of deduster and system - Google Patents
Fuzzy control method used for ash cleaning of deduster and system Download PDFInfo
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Abstract
The invention discloses a fuzzy control used for ash cleaning of a deduster and a system. The fuzzy control method comprises steps of receiving a detection input transmitted by the detection device, calculating the deviation between detection input and a given value and a deviation changing rate as an input variable of the fuzzy control, fuzzifying the input variable into a fuzzy input, performing fuzzy inference and decision based on the fuzzy input in order to obtain fuzzy output and defuzzifying the fuzzy output as control output, and outputting the control output to a deduster pulse valve controller in order to control the switch of the pulse valve of the deduster, wherein the detection input comprises pressure difference of the outlet and inlet of the deduster and inlet and outlet pressure difference of various chambers of the deduster; and the control output is the dust cleaning time of various chambers of the deduster. The above method and the system adopt the fuzzy control strategy to realize the dedusting control of various chambers of the deduster, and can solve the dust cleaning problem under the condition that the filtering loads of the filtering bags of various chambers are not uniform.
Description
Technical field
The present invention relates to flue gas of refuse burning process field, particularly a kind of fuzzy control method for fly-ash separator deashing and system.
Background technology
The technique of current garbage-incineration smoke purifying process comparative maturity is semidry method+dry method+bag-type dust+activated carbon process, and the key equipment of fume treatment comprises: semidry method depickling reaction tower, fly-ash separator, SNCR, flying dust are collected.Wherein, fly-ash separator is collected pulverized limestone and activated charcoal for the fine solid particle collected in flue gas simultaneously and is continued to react by the objectionable impurities in flue gas and process harmful poisonous gas and filter further.The running of fly-ash separator directly has influence on the dust concentration of fume emission, and then affects environmental protection etc.Wherein, the deashing process of fly-ash separator is one of important running of fly-ash separator.Usually, judge that the load condition of each bin is very complicated work by fly-ash separator import and export difference signal and each bin differential pressure signal, use classical control mode because variable may be difficult to realize too much.
Summary of the invention
On the one hand, the invention provides a kind of fuzzy control method for fly-ash separator deashing, described fuzzy control method comprises: the detection input quantity that receiving detection device sends, and the rate of change of the deviation calculated between described detection input quantity and set-point and described deviation is using the input variable as fuzzy control; By fuzzyly for described input variable turning to Indistinct Input amount, carry out fuzzy reasoning and decision-making based on described Indistinct Input amount to obtain fuzzy output amount and by described fuzzy output amount defuzzification for controlling output quantity; And export described control output quantity to duster pulse valve control to control the switch of the pulse valve of fly-ash separator.Wherein, described detection input quantity comprises fly-ash separator inlet outlet pressure differential and each bin inlet outlet pressure differential of fly-ash separator, described control output quantity is each bin deashing time of fly-ash separator, wherein when described detection input quantity is each bin inlet outlet pressure differential of fly-ash separator, only using the input variable of the deviation of each bin inlet outlet pressure differential of fly-ash separator and its set-point as fuzzy control.
In one embodiment of the invention, described fuzzy for the described input variable Indistinct Input amount that turns to be comprised described input variable mapping transformation to discrete input domain.
In one embodiment of the invention, the quantification domain grade of described input variable is set to 5.
In one embodiment of the invention, described input variable quantizes according to the following formula:
Wherein, x represents described input variable, and Y represents the input variable after quantification, and a represents the lower limit of described input variable, and b represents the upper limit of described input variable, and n represents quantification gradation.
In one embodiment of the invention, described defuzzification is carried out according to the following formula:
Wherein, x represents described fuzzy output amount, and Y represents described control output quantity, and a represents the lower limit of described fuzzy output amount, and b represents the upper limit of described fuzzy output amount, and n represents quantification gradation.
In one embodiment of the invention, input domain corresponding to described input variable is set to 6, and output domain corresponding to described fuzzy output amount is set to 6.
In one embodiment of the invention, the Linguistic Value fuzzy subset of described Indistinct Input amount is [negative large (NB), negative little (NS), zero (O), just little (PS), honest (PB)].
In one embodiment of the invention, the Linguistic Value fuzzy subset of described fuzzy output amount is [negative large (NB), in negative (NM), negative little (NS), zero (O), just little (PS), center (PM), honest (PB)].
In one embodiment of the invention, the subordinate function of the subordinate function of the Linguistic Value fuzzy subset of described Indistinct Input amount and the Linguistic Value fuzzy subset of described fuzzy output amount is triangular function.
On the other hand, the present invention also provides a kind of Fuzzy control system for fly-ash separator deashing, described Fuzzy control system comprises: load module, for the detection input quantity that receiving detection device sends, and the rate of change of the deviation calculated between described detection input quantity and set-point and described deviation is using the input variable as fuzzy control; Processing module, for by fuzzyly for described input variable turning to Indistinct Input amount, carry out fuzzy reasoning and decision-making based on described Indistinct Input amount to obtain fuzzy output amount and by described fuzzy output amount defuzzification for controlling output quantity; And output module, for exporting described control output quantity to duster pulse valve control to control the switch of the pulse valve of fly-ash separator.Wherein, described detection input quantity comprises fly-ash separator inlet outlet pressure differential and each bin inlet outlet pressure differential of fly-ash separator, described control output quantity is each bin deashing time of fly-ash separator, wherein when described detection input quantity is each bin inlet outlet pressure differential of fly-ash separator, only using the input variable of the deviation of each bin inlet outlet pressure differential of fly-ash separator and its set-point as fuzzy control.
The above-mentioned fuzzy control method for fly-ash separator deashing and system adopt the dust-removing control of fuzzy control strategy realization to each bin of fly-ash separator, overcome the uneven and various system noise of each bin load to the disturbance of system, realize the automatic spraying of Large Size Bag Type Filters, extend the serviceable life of filter bag.
Accompanying drawing explanation
Following accompanying drawing of the present invention in this as a part of the present invention for understanding the present invention.Shown in the drawings of embodiments of the invention and description thereof, be used for explaining principle of the present invention.
In accompanying drawing:
Fig. 1 shows according to an embodiment of the invention, for the process flow diagram of the fuzzy control method of fly-ash separator deashing;
Fig. 2 shows according to an embodiment of the invention, signal data flow graph when being applied to exemplary scenario for the fuzzy control method of fly-ash separator deashing; And
Fig. 3 shows according to an embodiment of the invention, for the structured flowchart of the Fuzzy control system of fly-ash separator deashing.
Embodiment
In the following description, a large amount of concrete details is given to provide more thorough understanding of the invention.But, it is obvious to the skilled person that the present invention can be implemented without the need to these details one or more.In other example, in order to avoid obscuring with the present invention, technical characteristics more well known in the art are not described.
In order to thoroughly understand the present invention, by following description, detailed method step and/or structure are proposed.Obviously, execution of the present invention is not limited to specific details appreciated by those skilled in the art.Preferred embodiment of the present invention is described in detail as follows, but except these are described in detail, the present invention can also have other embodiments.
Should be understood that, " comprise " when using term in this manual and/or " comprising " time, it indicates exists described feature, entirety, step, operation, element and/or assembly, but does not get rid of existence or additional other features one or more, entirety, step, operation, element, assembly and/or their combination.
According to an aspect of the present invention, a kind of fuzzy control method for fly-ash separator deashing is provided.Fig. 1 shows according to an embodiment of the invention for the process flow diagram of the fuzzy control method 100 of fly-ash separator deashing.As shown in Figure 1, method 100 comprises the steps:
Step 101: the detection input quantity that receiving detection device sends, and the rate of change of the deviation calculated between detection input quantity and set-point and this deviation is using the input variable as fuzzy control.
Wherein, the input parameter of required detection and corresponding pick-up unit can be set based on the demand for control of the design parameter to fly-ash separator deashing.Such as, in an example of the present invention, need to control fly-ash separator inlet outlet pressure differential, corresponding sensor so can be set to detect fly-ash separator inlet outlet pressure differential.In another example, need to control the inlet outlet pressure differential of each bin of fly-ash separator, corresponding sensor so can be set to detect the inlet outlet pressure differential of each bin of fly-ash separator.
Calculate detect deviation (or being called error) E20 between input quantity (such as fly-ash separator inlet outlet pressure differential) and set-point and rate of change (or being called error transform rate) DE of this deviation time, the actual value (also referred to as process values) of detected fly-ash separator inlet outlet pressure differential can be obtained deviation signal compared with its corresponding set-point, and differential is carried out to obtain the rate of change of deviation to deviation signal.Fuzzy control can using both deviation and deviation variation rate as input variable.When to detect input quantity be the inlet outlet pressure differential of each bin of fly-ash separator (such as bin 1-8), can only by the deviation of each bin inlet outlet pressure differential of fly-ash separator and its set-point (such as E11, E12 ... E18) as the input variable of fuzzy control.
Step 102: by fuzzyly for input variable turning to Indistinct Input amount, carry out fuzzy reasoning and decision-making based on Indistinct Input amount to obtain fuzzy output amount and by fuzzy output amount defuzzification for controlling output quantity.
Particularly, can by input variable mapping transformation on discrete input domain, to obtain Indistinct Input amount.Continue example above, if differential pressure tolerance scope is [-500,500], differential pressure tolerance rate of change scope [-50,50].Exemplarily, it is 5 that differential pressure tolerance quantizes domain grade, and it is 5 that differential pressure tolerance rate of change quantizes domain grade, and exporting domain quantification domain grade is 6.
In one embodiment of the invention, input variable can quantize according to formula (1):
Wherein, in formula (1), x represents input variable, and Y represents the input variable after quantification, and a represents the lower limit of input variable, and b represents the upper limit of input variable, and n represents quantification gradation.
Because fly-ash separator pressure reduction control system is not high for accuracy requirement, as long as ensure fly-ash separator pressure reduction within the specific limits, be acceptable for operations staff.In one example, be set to 6 for input variable domain, the fuzzy subset of variable Linguistic Value can be [NB, NS, O, PS, PB].In one example, for output variable, in order to anti-locking system shakes, output variable domain is set to 6, the fuzzy subset of variable Linguistic Value can be [NB, NM,
NS，O，PS，PM，PB]。For input the subordinate function of output variable all can adopt comparatively simple triangular function.Wherein NB represents negative large, NM represent negative in, NS represents negative little, and O represents that zero, PS represents just little, and PM represents center, and PB represents honest.
According to one embodiment of present invention, the design in Fuzzy strategy storehouse can be as follows:
If E20=PB and DE=PB, then output=NB;
If E20=PB and DE=PS, then output=NB;
If E20=PB and DE=O, then output=NM;
If E20=PB and DE=NS, then output=NM;
If E20=PB and DE=NB, then output=NS;
……
Each bin such as bin 1 deashing rule base of fly-ash separator specifically describes as follows:
If E11=PB, then output=NB;
If E11=PS, then output=NB;
If E11=O, then output=O;
If E11=NS, then output=PS;
If E11=NM, then output=PB.
Control strategy storehouse can be set up based on the practical experience of operations staff.Preferably, fuzzy rule base has online modification function.Different garbage burning factory actual conditions are different, and through running for a long time, operation all can have new experience, and the online modification function of fuzzy rule base can enable maintainer these new experiences be added in rule base very easily.In addition, man-machine interface can be developed for rule base, thus conveniently debugging, maintainer modify for rule base.
According to subordinate function and the Fuzzy strategy storehouse of fuzzy language value, fuzzy relation can be obtained; Based on Indistinct Input amount and fuzzy relation, fuzzy output amount can be obtained; Fuzzy output amount can obtain final control output quantity through defuzzification.
In one embodiment of the invention, can carry out according to formula (2) the defuzzification of fuzzy output amount:
Wherein, in formula (2), x represents fuzzy output amount, and Y represents control output quantity, and a represents the lower limit of fuzzy output amount, and b represents the upper limit of fuzzy output amount, and n represents quantification gradation.
Step 103: export control output quantity to duster pulse valve control to control the switch of the pulse valve of fly-ash separator.Continue example above, detect input quantity and comprise fly-ash separator inlet outlet pressure differential and each bin inlet outlet pressure differential of fly-ash separator, controlling output quantity is each bin deashing time of fly-ash separator.Each bin deashing time data of this fly-ash separator can be sent to duster pulse valve control to control the switch of the pulse valve of fly-ash separator, thus regulates fly-ash separator inlet outlet pressure differential and each bin inlet outlet pressure differential of fly-ash separator conversely.Fig. 2 shows signal data flow graph when being applied to above-mentioned example according to the fuzzy control method for fly-ash separator deashing of the embodiment of the present invention, can understand principle and the process of said method by composition graphs 2.Wherein, in fig. 2, fly-ash separator is depicted as and comprises 8 bins (1-8 bin), and pulse valve to be controlled comprises 14.
According to a further aspect of the invention, a kind of Fuzzy control system for fly-ash separator deashing is also provided.Fig. 3 shows according to an embodiment of the invention, for the structured flowchart of the Fuzzy control system 300 of fly-ash separator deashing.As shown in Figure 3, Fuzzy control system 300 comprises load module 301, processing module 302 and output module 303.
Wherein, the detection input quantity that load module 301 sends for receiving detection device, and the rate of change of the deviation calculated between detection input quantity and set-point and deviation is using the input variable as fuzzy control.Processing module 302 for by fuzzyly for input variable turning to Indistinct Input amount, carry out fuzzy reasoning and decision-making based on Indistinct Input amount to obtain fuzzy output amount and by fuzzy output amount defuzzification for controlling output quantity.Output module 303 is for exporting control output quantity to duster pulse valve control to control the switch of the pulse valve of fly-ash separator.Wherein, detect input quantity and comprise fly-ash separator inlet outlet pressure differential and each bin inlet outlet pressure differential of fly-ash separator, controlling output quantity is each bin deashing time of fly-ash separator, wherein when to detect input quantity be each bin inlet outlet pressure differential of fly-ash separator, only using the input variable of the deviation of each bin inlet outlet pressure differential of fly-ash separator and its set-point as fuzzy control.The embodiment that can describe with reference to composition graphs 1 understands the detailed process of each module operation, repeats no more herein.
The modules of the embodiment of the present invention with hardware implementing, or can realize with the software module run on one or more processor, or realizes with their combination.It will be understood by those of skill in the art that the some or all functions for the some or all parts in the Fuzzy control system of fly-ash separator deashing that microprocessor or digital signal processor (DSP) can be used in practice to realize according to the embodiment of the present invention.The present invention can also be embodied as part or all equipment for performing method as described herein or device program (such as, computer program and computer program).Realizing program of the present invention and can store on a computer-readable medium like this, or the form of one or more signal can be had.Such signal can be downloaded from internet website and obtain, or provides on memory carrier, or provides with any other form.
The above-mentioned fuzzy control method for fly-ash separator deashing and system adopt the dust-removing control of fuzzy control strategy realization to each bin of fly-ash separator, overcome the uneven and various system noise of each bin load to the disturbance of system, realize the automatic spraying of Large Size Bag Type Filters, extend the serviceable life of filter bag.
The present invention is illustrated by above-described embodiment, but should be understood that, above-described embodiment just for the object of illustrating and illustrate, and is not intended to the present invention to be limited in described scope of embodiments.In addition it will be appreciated by persons skilled in the art that the present invention is not limited to above-described embodiment, more kinds of variants and modifications can also be made according to instruction of the present invention, within these variants and modifications all drop on the present invention's scope required for protection.Protection scope of the present invention defined by the appended claims and equivalent scope thereof.
Claims (10)
1. for a fuzzy control method for fly-ash separator deashing, it is characterized in that, described fuzzy control method comprises:
The detection input quantity that receiving detection device sends, and the rate of change of the deviation calculated between described detection input quantity and set-point and described deviation is using the input variable as fuzzy control;
By fuzzyly for described input variable turning to Indistinct Input amount, carry out fuzzy reasoning and decision-making based on described Indistinct Input amount to obtain fuzzy output amount and by described fuzzy output amount defuzzification for controlling output quantity; And
Described control output quantity is exported to duster pulse valve control to control the switch of the pulse valve of fly-ash separator,
Wherein, described detection input quantity comprises fly-ash separator inlet outlet pressure differential and each bin inlet outlet pressure differential of fly-ash separator, described control output quantity is each bin deashing time of fly-ash separator, wherein when described detection input quantity is each bin inlet outlet pressure differential of fly-ash separator, only using the input variable of the deviation of each bin inlet outlet pressure differential of fly-ash separator and its set-point as fuzzy control.
2. fuzzy control method according to claim 1, is characterized in that, describedly comprises described input variable mapping transformation fuzzy for the described input variable Indistinct Input amount that turns to discrete input domain.
3. fuzzy control method according to claim 2, is characterized in that, the quantification domain grade of described input variable is set to 5.
4. fuzzy control method according to claim 3, is characterized in that, described input variable quantizes according to the following formula:
Wherein, x represents described input variable, and Y represents the input variable after quantification, and a represents the lower limit of described input variable, and b represents the upper limit of described input variable, and n represents quantification gradation.
5. fuzzy control method according to claim 1, is characterized in that, described defuzzification is carried out according to the following formula:
Wherein, x represents described fuzzy output amount, and Y represents described control output quantity, and a represents the lower limit of described fuzzy output amount, and b represents the upper limit of described fuzzy output amount, and n represents quantification gradation.
6. fuzzy control method according to claim 1, is characterized in that, input domain corresponding to described input variable is set to 6, and output domain corresponding to described fuzzy output amount is set to 6.
7. fuzzy control method according to claim 1, is characterized in that, the Linguistic Value fuzzy subset of described Indistinct Input amount is [negative large (NB), negative little (NS), zero (O), just little (PS), honest (PB)].
8. fuzzy control method according to claim 1, it is characterized in that, the Linguistic Value fuzzy subset of described fuzzy output amount is [negative large (NB), in negative (NM), negative little (NS), zero (O), just little (PS), center (PM), honest (PB)].
9. fuzzy control method according to claim 1, is characterized in that, the subordinate function of the subordinate function of the Linguistic Value fuzzy subset of described Indistinct Input amount and the Linguistic Value fuzzy subset of described fuzzy output amount is triangular function.
10. for a Fuzzy control system for fly-ash separator deashing, it is characterized in that, described Fuzzy control system comprises:
Load module, for the detection input quantity that receiving detection device sends, and the rate of change of the deviation calculated between described detection input quantity and set-point and described deviation is using the input variable as fuzzy control;
Processing module, for by fuzzyly for described input variable turning to Indistinct Input amount, carry out fuzzy reasoning and decision-making based on described Indistinct Input amount to obtain fuzzy output amount and by described fuzzy output amount defuzzification for controlling output quantity; And
Output module, for exporting described control output quantity to duster pulse valve control to control the switch of the pulse valve of fly-ash separator,
Wherein, described detection input quantity comprises fly-ash separator inlet outlet pressure differential and each bin inlet outlet pressure differential of fly-ash separator, described control output quantity is each bin deashing time of fly-ash separator, wherein when described detection input quantity is each bin inlet outlet pressure differential of fly-ash separator, only using the input variable of the deviation of each bin inlet outlet pressure differential of fly-ash separator and its set-point as fuzzy control.
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| CN114534383A (en) * | 2022-03-25 | 2022-05-27 | 无锡红旗除尘设备有限公司 | Pulse blowing control method |
| CN114534383B (en) * | 2022-03-25 | 2023-07-21 | 无锡红旗除尘设备有限公司 | Pulse blowing control method |
| CN117582748A (en) * | 2024-01-18 | 2024-02-23 | 江苏宇梦环保科技有限公司 | Automatic ash removal control method for bag type dust collector |
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