CN106805282A - A kind of method for controlling water content of chimneying formula dried material - Google Patents
A kind of method for controlling water content of chimneying formula dried material Download PDFInfo
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- CN106805282A CN106805282A CN201710082695.6A CN201710082695A CN106805282A CN 106805282 A CN106805282 A CN 106805282A CN 201710082695 A CN201710082695 A CN 201710082695A CN 106805282 A CN106805282 A CN 106805282A
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- formula
- drying device
- chimneying
- plc
- drying
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- 239000000463 material Substances 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 title claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 238000001035 drying Methods 0.000 claims abstract description 65
- 230000018044 dehydration Effects 0.000 claims abstract description 23
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 23
- 230000033228 biological regulation Effects 0.000 claims abstract description 14
- 238000012544 monitoring process Methods 0.000 claims abstract description 4
- 238000011897 real-time detection Methods 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 238000002474 experimental method Methods 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 abstract description 5
- 239000002699 waste material Substances 0.000 abstract description 3
- 241000208125 Nicotiana Species 0.000 description 4
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000009123 feedback regulation Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
- A24B3/00—Preparing tobacco in the factory
- A24B3/04—Humidifying or drying tobacco bunches or cut tobacco
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
- A24B3/00—Preparing tobacco in the factory
- A24B3/10—Roasting or cooling tobacco
Abstract
The present invention relates to a kind of control method of chimneying formula dried material moisture content, it is adaptable to which the chimneying drying device of closing carries out moisture control during dry materials.This method is by dehydration rate formula and entrance mass flow formula write-in PLC, PLC material water ratio process set values after drying are adjusted with the deviation of actual moisture content using PID closed loop feedbacks, PLC carries out real-time detection and regulation and control according to sensing data to the material instantaneous delivery in closed conduct Pneumatic drying device, regulation enters the inventory of chimneying formula drying device, the actual moisture content convergence process set value of material after making to dry.The present invention can avoid passing through material waste and the low problem of production efficiency caused by experimental technique measurement, and the situation of change of the accurate tracking each parameter of drying device of energy carries out real-time monitoring, and the moisture content of material is more stable after making to dry.
Description
Technical field
The present invention relates to a kind of control method of chimneying formula dried material moisture content, it is adaptable to the chimneying of closing
Drying device carries out moisture control during dry materials.
Technical background
After the light materials such as tobacco leaf, pipe tobacco enter chimneying formula drying device, in high temperature hot gas stream course of conveying,
Thermal current is fully contacted with material, and material is subject to drying and dehydrating, moisture content reduction.In normal production, production technology is to material
Dried moisture content has strict demand, and is the important Con trolling index of materiel machining quality.Material after controlling to dry
Moisture content, it is necessary first to determine water separation capability (the i.e. dehydration rate M of drying device, with the dehydration in the unit interval of drying device
Measure to weigh), electronic scale (measurement and control material instantaneous delivery S) and Moisture Meter (detection generally are installed in drying device entrance
Material water ratio Wi), then dried material water ratio is：
In formula (1)：
W0：Dried material water ratio, unit：%；
S：Drying device entrance mass flow, unit：Kg/h；
M：The amount of moisture (i.e. dehydration rate) that material is reduced after drying device, unit：Kg/h.
The measure to the dehydration rate of drying device mainly uses experimental technique at present：I.e. for different device parameter (heat
The parameters such as air temperature, wind speed are different) material dewatering experiment is carried out respectively to determine the dehydration rate of drying device, device parameter and work
It is accomplished by re-starting experiment after skill Parameters variation, causes material waste and production efficiency low；And measurement is tested by punishment in advance
During equipment dehydration rate, it is impossible to all simulate completely all changes scope of drying device parameter, once device parameter is changed into not having
There is the value crossed by experimental simulation, there is no experimental data to support in production, the moisture content after dry materials is easy for deviateing regulation and control
Desired value.Additionally, partially dried system does not carry out equipment dehydration rate measure, material is aqueous after detecting dry in production process
Rate carries out feedback regulation when there is deviation with desired value to device parameter and entrance mass flow, aqueous with material after reducing drying
There is hysteresis quality in the deviation of rate and desired value, such control methods, the moisture content of material easily fluctuates after drying, with goal of regulation and control
There is deviation, regulating effect is undesirable.
The content of the invention
Problem present in material water ratio control process after being dried for above-mentioned drying device, the invention solves the problems that ask
Topic is the method for being taken through calculation to obtain the control of drying device dehydration rate.
Implementation method of the invention：Dehydration rate formula and entrance mass flow formula write-in PLC, PLC are passed through
Material water ratio process set value is adjusted with the deviation of actual moisture content using PID closed loop feedbacks after drying, and PLC is according to sensor
Data carry out real-time detection and regulation and control to entering the material instantaneous delivery in closed conduct Pneumatic drying device, and regulation enters pipeline
The inventory of air-flowing type drying device, the actual moisture content convergence process set value of material after making to dry.
Described dehydration rate formula is, M=2.79 × 10-5×(Ti-T0) × F, wherein dehydration rate M, entrance temperature of charge
Ti, outlet mass temperatures To, hot blast air quantity F；Entrance mass flow formula is：
Wherein S is entrance mass flow, WtBe technique initialization drying after material water ratio, WiIt is drying device porch
Material water ratio.
PLC adjusts the inventory of entrance by controlling the speed of the belted electronic balance of drying device porch.
Hot blast at the material inlet of this control method temperature in use sensor or thermocouple real-time online detection drying device
Temperature, exit hot blast temperature；Make the hot blast wind speed that wind speed flowmeter or air velocity transducer detection pass through drying device；Use
Moisture Meter real-time monitoring enters the material water ratio W of drying devicei, dry the material water ratio W in exit0。
From formula (1), supplied materials instantaneous delivery S and supplied materials moisture content WiAvailable electron scale and Moisture Meter are more accurately measured
Obtain, and the dehydration rate of drying device then cannot direct measurement obtain.When material enters drying device, in the heat effect of hot blast
Under, material contained humidity endothermic gasification, while hot blast temperature is reduced, the heat for being discharged is：
△ Q=C × W × (Ti-To) (2)
In formula (2)：
△Q：The heat that hot blast in drying device is discharged to material, unit：Joule；
C：The specific heat capacity of hot blast, the specific heat capacity of hot-air is usually 1003~1009J/ (kg DEG C), and usual value is
1005J/(kg·℃)；
W：It is the hot blast air quantity for having contact heat-exchanging in efficient drying section with material, unit：kg；
Ti and To：At drying device material inlet and the hot blast temperature of exit, unit：℃.
Because, except hot blast is exactly material, the heat that hot blast is discharged vaporizes material moisture, through looking into drying device
Related data is ask, it is constant that the water of unit mass is vaporized absorbed heat (heat of vaporization), is 3.6 × 107J/kg.Therefore
Understand that the material heat absorption △ Q and dehydration rate M (dehydrating amount in the unit interval) of drying device has following relation：
△ Q=3.6 × 107×M×H
Gone out by the derivation of equation：
In formula (3)：H is time, unit hour.With the wind that test point is flowed through in the air flow sensor measurable unit interval
Amount, referred to as unit interval air quantity F, thereforeFormula (3) just can be exchanged into：
M=2.79 × 10-5×(Ti- To)×F (4)
Formula (4) is substituted into formula (1)Afterwards, can derive gateway mass flow is：
The regulation and control of material water ratio Wo, material water ratio after making to dry after adjusting supplied materials instantaneous delivery S to realize drying
Goal of regulation and control value Wt (technological standards setting value) is reached, when Wo and Wt reach unanimity, supplied materials instantaneous delivery now is：
Dehydration rate formula of the invention is to occupy the heat of vaporization that the heat that hot blast discharged is completely converted into moisture in stem,
But the material actually in hot blast also absorbs partial heat simultaneously, but this partial heat cannot accurately quantify, therefore use
Above-mentioned formula calculate regulation and control inlet flow rate when, the present invention simultaneously strengthened using PID closed loop feedback controls algorithm dry after material
Accuracy (the wherein drying device entrance mass flow of moisture content regulation and control
Applicable elements of the invention：Drying device of the present invention is microgranular to tobacco leaf, pipe tobacco etc., thread using hot blast
Or the light material of sheet is dried, the efficient drying section of device must be totally enclosed tubular conduit, and dryer section outside should
There is thermal insulation layer, it is to avoid dryer section produces heat exchange with extraneous；Thermal current is flowed fast through in drying tube, after material enters drying tube
It is fully contacted with thermal current, thermal current drives material flow forward, from pipe end effluent material is dried, drying tube is entered from material
It is exactly efficient drying section to the part of discharge drying tube.
The beneficial effects of the invention are as follows：The present invention detects drying device parameter (efficient drying section entrance heat by sensor
Air temperature, outlet hot blast temperature and hot blast air quantity), the dehydration rate of direct computing device, it is to avoid set by experimental technique measurement
Material waste and the low problem of production efficiency caused by standby water separation capability；And the dehydration rate that the present invention is calculated can be more accurate
Tracking each parameter of drying device situation of change, therefore dry after material moisture content it is more stable；While material of the invention
Drying effect is well more many than directly carrying out the control system of dry materials with feedback regulation, and the hysteresis quality and overshoot deviation of regulation and control are big
To reduce, it is adaptable to the production line higher to water content requirement stability after dry materials.
Brief description of the drawings
Fig. 1 is control method schematic diagram of the invention.
Specific embodiment
Referring to Fig. 1, the technical approach and flow of specific implementation are：
1. the present invention needs hot blast at the material inlet of temperature in use sensor or thermocouple real-time online detection drying device
Temperature Ti, exit hot blast temperature To；Wind speed is detected with wind speed flowmeter or air velocity transducer, further according to hot blast density, is done
The sectional area of dry pipe calculates the hot blast rate F that dryer section is flowed through in the unit interval；Enter to dry using Moisture Meter real-time monitoring and fill
The material water ratio W for puttingi, dry the material water ratio Wo in exit；Using control type belted electronic balance to entering drying device
Material instantaneous delivery S carry out real-time detection and regulation and control.The parameters collected according to more than, substitute into formula (4) to drying
The dehydration rate of device is calculated in real time, and the dehydration rate that will be calculated substitutes into formula (5) and calculates mass flow S, then by material
Flow S controls drying device entrance belted electronic balance, material water ratio Wo and process set value W after making to drytReach unanimity.With
Upper evaluation work can be completed with programmable controller PLC, if drying device or production line have Programmable Logic Controller, can be directly sharp
The calculating of dehydration rate and the control of dry materials process are completed with the controller, if without ready-made controller, needing buying independent
PLC, weak signal testing can complete calculating of the invention and control function.
2. the sensor signal of parameter needed for the present invention is input to PLC, it is ensured that input signal is correct, will be dehydrated
Rate formula (4) and entrance mass flow computing formula (5) write PLC by the format program of PLC, it is ensured that control
Normal program operation.
3. PID closed loop feedback Operations Control Procedures are set up in PLC, with entrance mass flow computing formula Operation values as the feedforward control amount of PID control, be aided with outlet
The closed loop feedback operation values of material water ratio are modified to entrance mass flow, by the output of revised entrance mass flow value
To drying device entrance electronic scale, entrance mass flow is controlled.
Claims (4)
1. a kind of method of chimneying formula dried material moisture control, it is characterized in that：By dehydration rate formula and entrance material
Flow formula writes PLC, and PLC material water ratio process set values after drying are used with the deviation of actual moisture content
PID closed loop feedbacks are adjusted, and PLC is according to sensing data to entering the material instantaneous delivery in closed conduct Pneumatic drying device
Real-time detection and regulation and control are carried out, regulation enters the inventory of chimneying formula drying device, the reality of material is aqueous after making to dry
Rate convergence process set value.
2. the method for the chimneying formula dried material moisture control as described in claim 1, it is characterized in that：Described dehydration
Rate formula is, M=2.79 × 10-5×(Ti - T0) × F, wherein dehydration rate M, entrance temperature of charge Ti, outlet mass temperatures
To, hot blast air quantity F；Entrance mass flow formula is,
Wherein S is entrance mass flow, WtBe technique initialization drying after material water ratio, WiIt is the thing of drying device porch
Material moisture content.
3. the method for the chimneying formula dried material moisture control as described in claim 2, it is characterized in that：PLC is by control
The speed of the belted electronic balance of drying device porch processed adjusts the inventory of entrance.
4. the method for the chimneying formula dried material moisture control as described in claim 2, it is characterized in that：This control method
Hot blast temperature, exit hot blast temperature at the material inlet of temperature in use sensor or thermocouple real-time online detection drying device
Degree；Make the hot blast wind speed that wind speed flowmeter or air velocity transducer detection pass through drying device；Entered using Moisture Meter real-time monitoring
The material water ratio for entering drying device is, the material water ratio for drying exit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710082695.6A CN106805282A (en) | 2017-02-16 | 2017-02-16 | A kind of method for controlling water content of chimneying formula dried material |
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| CN201710082695.6A CN106805282A (en) | 2017-02-16 | 2017-02-16 | A kind of method for controlling water content of chimneying formula dried material |
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| CN106805282A true CN106805282A (en) | 2017-06-09 |
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| CN201710082695.6A Pending CN106805282A (en) | 2017-02-16 | 2017-02-16 | A kind of method for controlling water content of chimneying formula dried material |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108685142A (en) * | 2018-08-27 | 2018-10-23 | 红塔烟草(集团)有限责任公司 | Each process moisture content of outlet maintaining method in a kind of cigarette primary processing process |
| CN111165865A (en) * | 2020-03-12 | 2020-05-19 | 红云红河烟草(集团)有限责任公司 | Method for improving flow stability of tobacco leaves at inlet of charging machine |
| CN111165866A (en) * | 2019-12-12 | 2020-05-19 | 河南中烟工业有限责任公司 | Quality control method and system based on airflow type cut stem drying |
| CN111728252A (en) * | 2020-07-06 | 2020-10-02 | 河南中烟工业有限责任公司 | Control method and system for drying strength of tobacco roller |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108685142A (en) * | 2018-08-27 | 2018-10-23 | 红塔烟草(集团)有限责任公司 | Each process moisture content of outlet maintaining method in a kind of cigarette primary processing process |
| CN111165866A (en) * | 2019-12-12 | 2020-05-19 | 河南中烟工业有限责任公司 | Quality control method and system based on airflow type cut stem drying |
| CN111165865A (en) * | 2020-03-12 | 2020-05-19 | 红云红河烟草(集团)有限责任公司 | Method for improving flow stability of tobacco leaves at inlet of charging machine |
| CN111728252A (en) * | 2020-07-06 | 2020-10-02 | 河南中烟工业有限责任公司 | Control method and system for drying strength of tobacco roller |
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Application publication date: 20170609 |
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