CN103202528B - Cut lamina drying control method and cut lamina drying system based on feedforward and feedback of HT moisture compensation - Google Patents
Cut lamina drying control method and cut lamina drying system based on feedforward and feedback of HT moisture compensation Download PDFInfo
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Abstract
The invention discloses a cut lamina drying control method and a cut lamina drying system based on feedforward and feedback of HT moisture compensation. By the cut lamina drying control method, steam flow of an HT damping machine is adjusted to compensate HT incoming material moisture fluctuations, cut lamina moisture stability at an inlet of a rolling cylinder is maintained to the utmost extend, influence to a rolling cylinder drying process by the material moisture fluctuations is obviously reduced, dry process parameter stability is maintained, and process processing quality stability is improved; and cut lamina moisture and cut lamina flow at the inlet port of the rolling cylinder are added into a feedback control system through the feedforward, and accuracy of moisture adjustment in the rolling cylinder drying process is improved. The cut lamina drying control system based on the feedforward and feedback of the HT moisture compensation comprises a controller unit, two pneumatic actuators, two moisture meters, an electronic flow scale, a calculator and a cylinder wall steam pressure sensor. The control system is simple in structure, low in cost and easy to promote.
Description
Technical field
The present invention relates to based on the feedforward of HT water compensation and the cut tobacco drying control method of feedback and system.
Background technology
Roller drying affects the crucial process of tobacco in goods crudy, and this heat and wet treatment process can produce considerable influence to cut tobacco physics, chemistry and organoleptic attribute aspect etc.This course work principle is that leaf storing cabinet out has the tobacco leaf of certain moisture content after chopping, by the flow of feeding machine belt conveyer scale setting, sprays after warming and humidifying, enter cylinder cut tobacco dryer in HT damping machine through steam; Cylinder cut tobacco dryer provides drying source by steam-heated barrel and hot blast for cut tobacco, makes outlet cut tobacco reach the applicable moisture rolled of cigarette process requirement, simultaneously by cut tobacco loose curl, Filling power is increased.
Moisture and the stability thereof of drying rear cut tobacco are the key physical indexs affecting cigarette manufacturing quality.There is the more disturbance factors such as supplied materials cut tobacco moisture, flowed fluctuation due to cylinder cut tobacco drying, make outlet cut tobacco reach the quality index of regulation, and make the uniform moisture of all output cut tobaccos consistent, is the key of drying process Control System Design.Current drying process moisture controls to be feedback controlled to master with PID, and the general steam-return line that uses controls, and namely implements two close cycles serials control to the steam pressure of barrel or hot air heat exchanger, by the requirement regulating barrel or hot blast temperature to reach cut tobacco outlet moisture content.When cut-tobacco drier normally works, controller, according to the moisture content of outlet deviation output regulation signal detected, changes air bladder valve opening by executing agency and regulates heating steam pressure, regulate barrel or hot blast temperature with this.To fluctuate the impact of these disturbances on system for reducing supplied materials cut tobacco moisture, on FEEDBACK CONTROL basis, supplied materials cut tobacco moisture, changes in flow rate before part cut tobacco drying detection HT damping machine, and be added in control system by the mode of feedforward, namely needed for the moisture of cut tobacco supplied materials flow and entrance cut tobacco and current outlet, moisture set-point calculates the amount of anhydrating accordingly, and be converted into required steam pressure, using this pressure as set-point.
Current this Feedforward-feedback control mode, to a certain degree can improve the response speed of control system to supplied materials cut tobacco moisture upset.But supplied materials cut tobacco moisture is fluctuated, this feed-forward mode mainly carrys out disturbance cancelling by changing the technological parameters such as dry run barrel steam pressure, when supplied materials cut tobacco moisture upset is larger, the technological parameters such as barrel temperature, wind-warm syndrome regulate and are unfavorable for more greatly the stable of product inherent quality; Simultaneously, this feedforward control is supplied materials cut tobacco moisture, changes in flow rate before detection HT damping machine, and cut tobacco is also subject to the impact of HT damping machine warming and humidifying condition before entering cylinder, therefore, this detection signal that feedforward control adopts accurately can not reflect and enters drum drying equipment supplied materials moisture, affects control accuracy.
Summary of the invention
The invention provides based on the feedforward of HT water compensation and the cut tobacco drying control method of feedback and system, its objective is the deficiency solving prior art and exist, by regulating HT damping machine steam flow, before compensating HT, supplied materials cut tobacco moisture fluctuates, with stable drum inlet cut tobacco moisture, the cut tobacco moisture detected before drum inlet is joined in roller drying feedback control system by feedforward simultaneously, this control mode significantly reduces the impact of supplied materials moisture upset on roller drying process, the technological parameter that keeps dry is stablized, and improves product quality stability.
Based on the feedforward of HT water compensation and the cut tobacco drying control method of feedback, comprise the following steps:
Step 1: the first Moisture Meter and electronic flow scale are set in HT damping machine exit, the cut tobacco moisture X in Real-time Collection HT damping machine exit
1with cut tobacco flow M
1;
Step 2: the cut tobacco moisture X calculating HT damping machine exit
1with the cut tobacco moisture first set-point X at cut-tobacco drier drum inlet place
01difference DELTA X
1, utilize difference signal Δ X
1as the input signal of the first pneumatic actuator, the first pneumatic actuator exports HT steam control valve opening amount signal;
If difference DELTA X
1for just, then reduced the aperture of HT damping machine steam control valve by pneumatic actuator, until the cut tobacco moisture X in HT damping machine exit
1with set-point X
01unanimously;
If difference DELTA X
1be negative, then increased the aperture of HT damping machine steam control valve by pneumatic actuator, until the cut tobacco moisture X in HT damping machine exit
1with set-point X
01unanimously;
Step 3: place arranges pressure sensor at cut-tobacco drier drum steam pressure-regulating valve, detects the pressure P of cut-tobacco drier drum steam pressure-regulating valve in real time; At cut-tobacco drier drum outlet, place arranges the second Moisture Meter, detects cut-tobacco drier drum outlet place cut tobacco moisture X in real time
2, calculate cut-tobacco drier drum outlet place cut tobacco moisture X
2with cut-tobacco drier drum outlet place cut tobacco moisture second set-point X
02moisture content of outlet deviation delta X
2, i.e. Δ X
2=| X
2-X
02|;
Step 4: utilize the output quantity of the second PID controller to drive the second pneumatic actuator, the second pneumatic actuator exports the barrel steam pressure control valve opening signal of cut-tobacco drier, makes cut-tobacco drier drum outlet place moisture X
2with cut tobacco moisture second set-point X
02unanimously, step 2 is returned;
If X
2> X
02, then the aperture of the barrel steam pressure control valve of cut-tobacco drier is increased; If X
2< X
02, then the aperture of the barrel steam pressure control valve of cut-tobacco drier is reduced;
Adopt Double layers PID control method in described step 4, control cut-tobacco drier drum outlet place cut tobacco moisture, its concrete control procedure is as follows:
By the cut tobacco moisture X in Real-time Collection HT damping machine exit
1, cut tobacco flow M
1with cut tobacco moisture content of outlet second set-point X
02as the input quantity of feedforward compensation controller, calculate dehydrating amount Q=M
1(X
1-X
02)/(1-X
02), specified dehydrating amount Q
t=M
1(X
1-X
02)/(1-X
02), Δ Q=Q-Q
t; Because baking silk system is linear near operating point, feedforward compensation controller exports cut-tobacco drier drum steam pressure first set-point according to dehydrating amount fluctuation signal Δ Q, i.e. P
1=k Δ Q, wherein k is coefficient, is obtained by the steam pressure changing value of analytical unit dehydrating amount;
By cut-tobacco drier drum outlet place cut tobacco moisture X
2with cut-tobacco drier drum outlet place cut tobacco moisture second set-point X
02moisture content of outlet deviation delta X
2as the input quantity of the first PID controller, the output quantity of the first PID controller is cut tobacco steam pressure second set-point;
Using cut tobacco steam pressure first set-point and the second set-point sum as cut tobacco steam pressure set-point, using the input quantity of the difference of cut tobacco steam pressure set-point and cut-tobacco drier cylinder wall steam pressure P as the second PID controller, the output signal of the second PID controller is steam pressure control valve valve opening value.
Described first Moisture Meter and the second Moisture Meter are infrared moisture meter.
Described cut tobacco moisture first set-point X
01for 20%-22%, cut tobacco moisture second set-point X
02be 12.5%.
Based on the feedforward of HT water compensation and the cut tobacco drying control system of feedback, the feedforward based on HT water compensation described in employing and the cut tobacco drying control method of feedback, should comprise controller unit, two pneumatic actuators, two Moisture Meter, electronic flow scale, arithmetic unit and barrel steam pressure sensor based on the feedforward of HT water compensation and the cut tobacco roller drying Process Control System of feedback;
Wherein, controller unit comprises the first PID controller, the second PID controller and feedforward compensation controller, controller unit, the second pneumatic actuator, cut-tobacco drier barrel steam pressure control valve and cut-tobacco drier cylinder are connected successively, the input of the second Moisture Meter is connected with the outlet of cut-tobacco drier cylinder, the output of the second Moisture Meter is connected with controller unit, barrel steam pressure sensor is arranged at the outlet of cut-tobacco drier barrel steam pressure control valve, and barrel steam pressure sensor is connected with controller unit;
Arithmetic unit, the first pneumatic actuator, HT steam flow control valve, HT damping machine, the first Moisture Meter and feedforward compensation controller are connected successively; Electronic flow scale is arranged on HT damping machine exit, is connected with feedforward compensation controller; First Moisture Meter is connected with arithmetic unit;
Described arithmetic unit is for calculating cut tobacco moisture undulating value when cut tobacco enters HT damping machine.
Digital difference signal, with D/A converter module, is converted to analog signal by pneumatic actuator, drives controlling opening of valve.
Beneficial effect
The invention provides based on the feedforward of HT water compensation and the cut tobacco drying control method of feedback and system, the method is by regulating HT damping machine steam flow, before compensating HT, supplied materials cut tobacco moisture fluctuates, at utmost keep drum inlet cut tobacco moisture stabilization, remarkable reduction supplied materials moisture upset is on the impact of roller drying process, the technological parameter that keeps dry is stablized, and improves process crudy stability; The cut tobacco moisture at drum inlet place and cut tobacco flow are joined feedback control system by feedforward, improves the accuracy of roller drying process moisture regulation; Controller unit, two pneumatic actuators, two Moisture Meter, electronic flow scale, arithmetic unit and barrel steam pressure sensor should be comprised based on the feedforward of HT water compensation and the cut tobacco roller drying Process Control System of feedback; This Control system architecture is simple, with low cost, is easy to promote.
Accompanying drawing explanation
Fig. 1 is cut-tobacco drier roller drying outlet cut tobacco moisture control block diagram in prior art;
Fig. 2 is the control block diagram of control method of the present invention;
Fig. 3 is Control system architecture figure of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described further.
As shown in Figure 2, the control block diagram of invention control method, for first factory two class brand cigarette formula cut tobacco A module roller drying manufacturing procedure:
Step 1: the first Moisture Meter and electronic flow scale are set in HT damping machine exit, the cut tobacco moisture X in Real-time Collection HT damping machine exit
1with cut tobacco flow M
1;
Step 2: the cut tobacco moisture X calculating HT damping machine exit
1with the cut tobacco moisture first set-point X at cut-tobacco drier drum inlet place
01difference DELTA X
1, utilize difference signal Δ X
1as the input signal of the first pneumatic actuator, this signal is after current analog signal through digital-to-analogue conversion, and the first pneumatic actuator exports HT steam control valve opening amount signal; X
01span is 20% ~ 22%;
If difference DELTA X
1for just, then reduced the aperture of HT damping machine steam control valve by pneumatic actuator, until the cut tobacco moisture X in HT damping machine exit
1with set-point X
01unanimously;
If difference DELTA X
1be negative, then increased the aperture of HT damping machine steam control valve by pneumatic actuator, until the cut tobacco moisture X in HT damping machine exit
1with set-point X
01unanimously;
Digital difference signal, with D/A converter module, is converted to analog signal by pneumatic actuator, drives controlling opening of valve;
Step 3: place arranges pressure sensor at cut-tobacco drier drum steam pressure-regulating valve, detects cut-tobacco drier drum steam pressure P in real time; At cut-tobacco drier drum outlet, place arranges the second Moisture Meter, detects cut-tobacco drier drum outlet place cut tobacco moisture X in real time
2, calculate cut-tobacco drier drum outlet place cut tobacco moisture X
2with cut-tobacco drier drum outlet place cut tobacco moisture second set-point X
02moisture content of outlet deviation delta X
2, i.e. Δ X
2=| X
2-X
02|; X
02
Step 4: utilize the output quantity of the second PID controller to drive the second pneumatic actuator, the second pneumatic actuator exports the barrel steam pressure control valve opening signal of cut-tobacco drier, makes cut-tobacco drier drum outlet place moisture X
2with cut tobacco moisture second set-point X
02unanimously, step 2 is returned;
If X
2> X
02, then the aperture of the barrel steam pressure control valve of cut-tobacco drier is increased; If X
2< X
02, then the aperture of the barrel steam pressure control valve of cut-tobacco drier is reduced;
Adopt Double layers PID control method in described step 4, control cut-tobacco drier drum outlet place cut tobacco moisture, its specific operation process is as follows:
By the cut tobacco moisture X in Real-time Collection HT damping machine exit
1, cut tobacco flow M
1with cut tobacco moisture content of outlet second set-point X
02as the input quantity of feedforward compensation controller, calculate dehydrating amount Q=M
1(X
1-X
02)/(1-X
02), specified dehydrating amount Q
t=M
1(X
01-X
02)/(1-X
02), Δ Q=Q-Q
t; Because baking silk system is linear near operating point, feedforward compensation controller exports drum steam pressure first set-point of cut-tobacco drier according to dehydrating amount fluctuation signal Δ Q, i.e. P
1=k Δ Q, wherein k is coefficient, is obtained by the steam pressure changing value of analytical unit dehydrating amount;
The P value of the first PID controller, I value and D value are set to 1.5,12 and 10, respectively by cut-tobacco drier drum outlet place cut tobacco moisture X
2with cut-tobacco drier drum outlet place cut tobacco moisture second set-point X
02moisture content of outlet deviation delta X
2as the input quantity of the first PID controller, the output quantity of the first PID controller is cut tobacco steam pressure second set-point;
Second controller P value, I value and D value are set to 2,200 and 180 respectively, using cut tobacco steam pressure first set-point and the second set-point sum as cut tobacco steam pressure set-point, utilize the input quantity of difference as the second PID controller of cut tobacco steam pressure set-point and cut-tobacco drier cylinder wall steam pressure P, the output signal of the second PID controller is steam pressure control valve valve opening value.
As shown in Figure 3, based on the feedforward of HT water compensation and the cut tobacco drying control system of feedback, the method based on humidity discharging humid control cut tobacco roller drying moisture content of outlet described in employing, should comprise controller unit, two pneumatic actuators, two Moisture Meter, electronic flow scale, arithmetic unit and barrel steam pressure sensor based on the feedforward of HT water compensation and the cut tobacco roller drying Process Control System of feedback;
Wherein, controller unit comprises the first PID controller, the second PID controller and feedforward compensation controller, controller unit, the second pneumatic actuator, cut-tobacco drier barrel steam pressure control valve and cut-tobacco drier cylinder are connected successively, the input of the second Moisture Meter is connected with the outlet of cut-tobacco drier cylinder, the output of the second Moisture Meter is connected with controller unit, the input of barrel steam pressure sensor exports with cut-tobacco drier barrel steam pressure control valve and is connected, and the output of barrel steam pressure sensor is connected with controller unit;
Arithmetic unit, the first pneumatic actuator, HT steam flow control valve, HT damping machine, the first Moisture Meter and feedforward compensation controller are connected successively; Electronic flow scale is arranged on HT damping machine exit, is connected with feedforward compensation controller; First Moisture Meter is connected with arithmetic unit.
The control block diagram of traditional control method as shown in Figure 1, under same materials and working condition, control method of the present invention and traditional control method is adopted to carry out drying to cut tobacco, cut tobacco entrance and exit Moisture stability compares in table 1, can find out and adopt this method drum inlet and outlet cut tobacco moisture mark partially to reduce, namely cut tobacco Moisture stability obviously improves.
Table 1 dries silk drum inlet and moisture content of outlet stability compares
Claims (4)
1., based on the feedforward of HT water compensation and the cut tobacco drying control method of feedback, it is characterized in that, comprise the following steps:
Step 1: the first Moisture Meter and electronic flow scale are set in HT damping machine exit, the cut tobacco moisture X in Real-time Collection HT damping machine exit
1with cut tobacco flow M
1;
Step 2: the cut tobacco moisture X calculating HT damping machine exit
1with the cut tobacco moisture first set-point X at cut-tobacco drier drum inlet place
01difference DELTA X
1, utilize difference signal Δ X
1as the input signal of the first pneumatic actuator, the first pneumatic actuator exports HT damping machine steam flow control valve opening amount signal;
Step 3: place arranges drum steam pressure sensor at cut-tobacco drier drum steam pressure-regulating valve, detects the pressure P of cut-tobacco drier drum steam pressure-regulating valve in real time; At cut-tobacco drier drum outlet, place arranges the second Moisture Meter, detects cut-tobacco drier drum outlet place cut tobacco moisture X in real time
2, calculate cut-tobacco drier drum outlet place cut tobacco moisture X
2with cut-tobacco drier drum outlet place cut tobacco moisture second set-point X
02moisture content of outlet deviation delta X
2, i.e. Δ X
2=| X
2-X
02|;
Step 4: adopt Double layers PID control method, utilize the output quantity of the second PID controller to drive the second pneumatic actuator, the second pneumatic actuator exports the drum steam pressure-regulating valve opening amount signal of cut-tobacco drier, makes cut-tobacco drier drum outlet place moisture X
2with cut tobacco moisture second set-point X
02unanimously, step 2 is returned;
Adopt Double layers PID control method in described step 4, control cut-tobacco drier drum outlet place cut tobacco moisture, its concrete control procedure is as follows:
By the cut tobacco moisture X in Real-time Collection HT damping machine exit
1, cut tobacco flow M
1with outlet cut tobacco moisture second set-point X
02as the input quantity of feedforward compensation controller, calculate dehydrating amount Q=M
1(X
1-X
02)/(1-X
02), specified dehydrating amount Q
t=M
1(X
01-X
02)/(1-X
02), Δ Q=Q-Q
t; Because cut-tobacco drier is linear near operating point, feedforward compensation controller exports the drum steam pressure first set-point P of cut-tobacco drier according to dehydrating amount fluctuation signal Δ Q
1, i.e. P
1=k Δ Q, wherein k is coefficient, is obtained by the steam pressure changing value of analytical unit dehydrating amount;
By cut-tobacco drier drum outlet place cut tobacco moisture X
2with cut-tobacco drier drum outlet place cut tobacco moisture second set-point X
02moisture content of outlet deviation delta X
2as the input quantity of the first PID controller, the output quantity of the first PID controller is drum steam pressure second set-point;
Using drum steam pressure first set-point and the second set-point sum as drum steam pressure set-point, using the input quantity of the difference of the pressure P of drum steam pressure set-point and cut-tobacco drier drum steam pressure-regulating valve as the second PID controller, the output signal of the second PID controller is steam pressure control valve valve opening value.
2. the cut tobacco drying control method of the feedforward based on HT water compensation according to claim 1 and feedback, is characterized in that, described first Moisture Meter and the second Moisture Meter are infrared moisture meter.
3. the cut tobacco drying control method of the feedforward based on HT water compensation according to claim 1 and feedback, is characterized in that, described cut tobacco moisture first set-point X
01for 20%-22%, cut tobacco moisture second set-point X
02be 12.5%.
4. based on the feedforward of HT water compensation and the cut tobacco roller drying control system of feedback, it is characterized in that, the feedforward based on HT water compensation described in any one of employing claim 1-3 and the cut tobacco drying control method of feedback, should comprise controller unit, two pneumatic actuators, two Moisture Meter, electronic flow scale, arithmetic unit and drum steam pressure sensors based on the feedforward of HT water compensation and the cut tobacco roller drying control system of feedback;
Wherein, controller unit comprises the first PID controller, the second PID controller and feedforward compensation controller, controller unit, the second pneumatic actuator, cut-tobacco drier drum steam pressure-regulating valve and cut-tobacco drier cylinder are connected successively, the input of the second Moisture Meter is connected with the outlet of cut-tobacco drier cylinder, the output of the second Moisture Meter is connected with controller unit, drum steam pressure sensor is arranged at the outlet of cut-tobacco drier drum steam pressure-regulating valve, and drum steam pressure sensor is connected with controller unit;
Arithmetic unit, the first pneumatic actuator, HT damping machine steam flow control valve, HT damping machine, the first Moisture Meter and feedforward compensation controller are connected successively; Electronic flow scale is arranged on HT damping machine exit, is connected with feedforward compensation controller; First Moisture Meter is connected with arithmetic unit;
Described arithmetic unit is for calculating cut tobacco moisture undulating value when cut tobacco enters HT damping machine.
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|---|---|---|---|
| CN201310123938.8A CN103202528B (en) | 2013-04-10 | 2013-04-10 | Cut lamina drying control method and cut lamina drying system based on feedforward and feedback of HT moisture compensation |
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|---|---|---|---|
| CN201310123938.8A CN103202528B (en) | 2013-04-10 | 2013-04-10 | Cut lamina drying control method and cut lamina drying system based on feedforward and feedback of HT moisture compensation |
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| CN103598668B (en) * | 2013-12-05 | 2016-01-20 | 福建中烟工业有限责任公司 | A kind of tobacco scrap prodn processing method controlling material water ratio |
| CN104172457B (en) * | 2014-09-10 | 2016-03-23 | 四川烟草工业有限责任公司 | Tobacco leaf silk drying machine control method |
| CN104273646B (en) * | 2014-09-28 | 2016-04-27 | 上海烟草集团有限责任公司 | Even feeding spraying humidification moisture control subsystem |
| CN104886751A (en) * | 2015-05-06 | 2015-09-09 | 红云红河烟草(集团)有限责任公司 | Shred drier cylinder wall temperature prediction model based on cut tobacco shred moisture content |
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| CN105962408B (en) * | 2016-07-01 | 2018-02-02 | 云南烟叶复烤有限责任公司 | A kind of how tactful composite control method that moisture content in leaves is exported to tobacco redryer |
| CN108095180A (en) * | 2016-11-25 | 2018-06-01 | 北京航天试验技术研究所 | It is a kind of to improve process and the device that piece tobacco quality is guaranteed the quality with storage |
| CN108236124B (en) * | 2016-12-23 | 2021-03-26 | 红塔烟草(集团)有限责任公司 | Cut tobacco drying method for reducing cut tobacco dry head and dry tail amount of Qinhuang island SH984 tower type cut tobacco dryer |
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| CN109998142B (en) * | 2019-04-30 | 2022-06-21 | 贵州中烟工业有限责任公司 | Control method for temperature of cylinder of cut-tobacco drier |
| CN109998141B (en) * | 2019-04-30 | 2022-08-30 | 贵州中烟工业有限责任公司 | Control method for outlet moisture of cut tobacco dryer |
| CN109998143B (en) * | 2019-04-30 | 2022-11-22 | 贵州中烟工业有限责任公司 | Preparation method of tobacco shred moisture gradient experimental sample |
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| CN110833200A (en) * | 2019-12-03 | 2020-02-25 | 贵州中烟工业有限责任公司 | Burley tobacco baking system |
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| CN114343220B (en) * | 2022-02-21 | 2023-07-25 | 东南大学 | Method for controlling water content at outlet of dried tobacco based on total water content compensation of feeding |
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| CN114747794B (en) * | 2022-04-21 | 2022-12-27 | 河南中烟工业有限责任公司 | Cut stem dryer outlet water content control method based on accumulation and strategy |
| CN115029527B (en) * | 2022-04-27 | 2023-09-19 | 首钢智新迁安电磁材料有限公司 | Control method for steam dew point of humidifier |
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| CN102987538B (en) * | 2012-11-28 | 2014-12-03 | 龙岩烟草工业有限责任公司 | Air-flowing type dried tobacco water control method |
| CN203243922U (en) * | 2013-04-10 | 2013-10-23 | 湖南中烟工业有限责任公司 | Shredded tobacco leaf drying control system based on feed-forward and feed-back of HT water compensation |
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