CN110347197A - A kind of continuous drying window control method of grain based on temperature zone - Google Patents
A kind of continuous drying window control method of grain based on temperature zone Download PDFInfo
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- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
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Abstract
The invention discloses a kind of continuous drying window control method of grain based on temperature zone, include the following steps: Step 1: determining the raw grain moisture m of grain to be dried1, Target moisture mt, drying temperature T, primary adjustment period ta, precisely adjustment period tb, primary control limit δ2, be precisely controlled limit δ1, accumulated temperature window；Step 2: default row grain speed v0Or row grain frequency f0, and calculate real-time temperature zone；Step 3: if ti/taFor integer and | m-mt|≤δ2When, moisture content of outlet and Target moisture are calculated using the primary adjustment period as the trend prediction value at interval；If trend prediction value | m-mt| ' > δ1, the accumulated temperature window is adjusted by pid algorithm and adjusts row's grain speed or row's grain frequency, is made | m-mt|≤δ2And trend prediction value | m-mt|′≤δ1；Step 4: reselecting the accumulated temperature window if primary data changes；Step 5: working as ti/tbWhen for integer, keep current window area constant, adjust the length-width ratio of the accumulated temperature window, and row's grain speed or row's grain frequency it is constant to primary data.
Description
Technical field
The present invention relates to grain drying fields, and in particular to a kind of continuous drying window control of grain based on temperature zone
Method.
Background technique
The elementary object of grain drying is to maintain under the premise of drying process stablizes, and use is most simple, easy to be dried
Process control method, with the moisture in minimum drying cost and energy consumption removal grain, to the online of grain moisture content in drying process
Observing and controlling and the control of technological quality are particularly important.
It is influenced by various external environmental conditions and drying machine itself design factor etc., drying process is one with multifactor
The complex process of coupled characteristic mostly uses the single factors such as moisture, temperature to control drying process, causes to control in the prior art
Inaccurately, it is easy to cause control deviation.Due to lacking dynamic prediction and parameter adaptive governing loop, rare solution drying process
Control large time delay, it is non-linear, parameter is changeable the problems such as effective ways.
A kind of grain company based on temperature zone involved in the application for a patent for invention application No. is 201710813306.2
Continuous dry TT&C system and method, using temperature zone value as the index controlled for a long time, grain goes out machine moisture as short-term control
Index machine is adjusted, effectively realize that moisture and quality Bi-objective control.Though can this method by drying control process point
To control for a long time and controlling two stages in short term, but do not accomplish to finely control in each stage；Control process uses simultaneously
Fuzzy controller and PID controller, process is relative complex, and parameter is not easy to obtain.
Summary of the invention
The present invention has designed and developed a kind of continuous drying window control method of the grain based on temperature zone, by grain drying
Grain moisture content control in control process is divided into primary control and is precisely controlled two-stage, makes to control precision and stability is higher；Together
When drying process controlled by patterned method, make that control process is simpler, intuitive, Yi Shixian, solve grain drying mistake
The technical issues of process control is non-linear, large time delay.
The present invention provides a kind of continuous drying window control method of the grain based on temperature zone, includes the following steps:
Step 1: determining the raw grain moisture m of grain to be dried1, Target moisture mt, drying temperature T, primary adjustment period ta、
Precisely adjustment period tb, primary control limit δ2, be precisely controlled limit δ1；And
Accumulated temperature window is selected according to the raw grain moisture, the Target moisture and the drying temperature；
Step 2: default row grain speed v0Or row grain frequency f0, and by acquiring delay section grain in Grain Drying Process in real time
It eats temperature or exhaust temperature calculates real-time temperature zone；
Step 3: calculating the difference of present sample time corresponding moisture content of outlet and the Target moisture；
If ti/taFor integer and | m-mt|≤δ2When, the moisture content of outlet and the Target moisture are calculated with the primary
The adjustment period is the trend prediction value at interval；
If the trend prediction value | m-mt| ' > δ1, the accumulated temperature window is adjusted by pid algorithm and adjusts row's grain
Speed or row's grain frequency, make | m-mt|≤δ2And the trend prediction value | m-mt|′≤δ1；
Wherein, tiFor the sampling time, i=1,2 ... n, m are the moisture content of outlet, | m-mt| it is the difference, | m-mt|′
For the trend prediction value；
Step 4: reselecting the accumulated temperature window, directly if the raw grain moisture or the drying temperature change
It is constant to the raw grain moisture or the drying temperature；
Step 5: working as ti/tbWhen for integer, calculates the real-time temperature zone and simultaneously keeps presently described accumulated temperature window constant,
The length-width ratio of the accumulated temperature window is adjusted, while adjusting row's grain speed or row's grain frequency, judges the raw grain moisture
Or whether the drying temperature changes, if variation, reselects the accumulated temperature window, until the raw grain moisture or described
Drying temperature does not change.
Preferably, the calculation formula of grain speed is arranged in the step 2 are as follows:
In formula, KfFor correction coefficient, Q is the grain volume of grain discharging wheel discharge in the unit time,S is drying
Machine cross-sectional area, f0To arrange grain frequency, t is the unit time, and V is the grain total volume of grain discharging wheel discharge.
Preferably, real-time temperature zone AT in the step 21Calculation formula are as follows:
In formula, HgFor dryer section height, HsFor delay section height, v is the speed that grain moves down in drying machine, T1、
T2、……、TnFor the cereal temperature that temperature sensor successively acquires, TeFor equilibrium temperature.
Preferably, the step of trend forecasting method in the step 3 includes:
Step 1: drawing the diagonal line of presently described accumulated temperature window, endpoint is presently described product on the right side of the diagonal line
The end time of warm window, and by 0~t of period0It is divided into: actual measurement 0~t of section timeyWith prediction section time ty~(t0-ty)；
Step 2: according to 0~t of the measured time sectionyInterior moisture content of outlet data are fitted using least square method and are surveyed
Section moisture content of outlet Trendline；
Step 3: being fitted prediction section moisture content of outlet according to the actual measurement section moisture content of outlet Trendline, and predict the end time
Moisture content of outlet；
Wherein, t0For the end time；tyTo select the time.
Preferably, the adjusting formula of row's grain frequency in the step 3 are as follows:
In formula, T1、T2、……、TnFor the cereal temperature that temperature sensor successively acquires, TeFor equilibrium temperature, f0It is current
Arrange grain frequency, HgFor dryer section height, AT0Currently to set accumulated temperature value, HsFor delay section height, v is grain in current drying machine
The speed moved down.
Preferably, the delay section cereal temperature is by being mounted on the temperature sensor measurement of the delay section；The tail
Temperature degree is measured by the Temperature Humidity Sensor for being mounted on each dryer section humidity discharging mouth.
Preferably, the outlet grain moisture content is automatically recorded by the Moisture Meter by being mounted on outlet.
The present invention compared with prior art possessed by the utility model has the advantages that
The present invention has designed and developed a kind of continuous drying window control method of the grain based on temperature zone, by grain drying
Grain moisture content control in control process is divided into primary control and is precisely controlled two-stage, makes to control precision and stability is higher；Together
When drying process controlled by patterned method, make that control process is simpler, intuitive, Yi Shixian, solve grain drying mistake
The technical issues of process control is non-linear, large time delay.
Detailed description of the invention
Fig. 1 is a kind of flow chart of the continuous drying window control method of grain based on temperature zone of the present invention.
Fig. 2 is in a kind of continuous drying window control method of grain based on temperature zone of the present invention in embodiment
The window control schematic diagram.
Fig. 3 is trend prediction in a kind of continuous drying window control method of grain based on temperature zone of the present invention
The schematic diagram of method.
Fig. 4 is a kind of process flow of the continuous drying window control method of grain based on temperature zone of the present invention
Figure.
Fig. 5 is a kind of sensor cloth of the continuous drying window control method of grain based on temperature zone of the present invention
Set figure.
Specific embodiment
Present invention will be described in further detail below with reference to the accompanying drawings, to enable those skilled in the art referring to specification text
Word can be implemented accordingly.
A kind of flow chart of the continuous drying window control method of grain based on temperature zone as shown in Figure 1, it is specific to wrap
Include following steps:
Step 1: input and storing initial data, the mesh including grain to be dried into the control display unit of drying machine
Mark moisture mt, raw grain moisture m1, drying temperature, primary adjustment period ta, precisely adjustment period tb, primary control limit δ2, precisely control
System limit δ1；And according to raw grain moisture m1, Target moisture mtAnd drying temperature is tabled look-up or the calculating using storage in a computer
Model selects accumulated temperature window, also to consider the requirement such as grain quality when necessary；
Wherein, a length of grain drying time of accumulated temperature window, the width of accumulated temperature window are grain drying temperature, accumulated temperature window
Area is temperature zone value；
Step 2: default row grain speed v0Or row grain frequency f0, and by acquiring delay section grain in Grain Drying Process in real time
It eats temperature or exhaust temperature calculates real-time temperature zone；
The calculation formula of real-time temperature zone are as follows:
In formula, HgFor dryer section height, HsFor delay section height, v is the speed that grain moves down in drying machine, T1、
T2、……、TnFor the cereal temperature that temperature sensor successively acquires, TeFor equilibrium temperature.
Step 3: calculating the difference of present sample time corresponding moisture content of outlet and Target moisture；
If ti/taFor integer and | m-mt|≤δ2When, it calculates moisture content of outlet and Target moisture and period t is being adjusted with primaryaFor
The trend prediction value at interval；
If trend prediction value | m-mt|′>δ1, pass through pid algorithm adjustment accumulated temperature window and the row's of adjusting grain speed or row's grain frequency
Rate makes | m-mt|≤δ2And trend prediction value | m-mt|′≤δ1；As shown in Fig. 2, accumulated temperature window area is by AT0It is adjusted to AT1；Again
By AT1It is adjusted to AT2, until meeting condition | m-mt|≤δ2And meet trend prediction value | m-mt|′≤δ1；
Wherein, tiFor the sampling time, i=1,2 ... n, m are moisture content of outlet, | m-mt| it is difference, | m-mtTrend is pre- for | ' be
Measured value；
Step 4: accumulated temperature window is reselected if primary data changes, until primary data is constant；
Step 5: working as ti/tbWhen for integer, calculates real-time temperature zone and keep current window area constant, precisely to adjust
Complete cycle tbThe length-width ratio of current accumulated temperature window is adjusted for interval, while the row's of adjusting grain speed or row's grain frequency, then
Sentence whether primary data changes, if variation, reselects accumulated temperature window, until primary data does not change.Such as Fig. 2
Shown, accumulated temperature window length-width ratio is by CT21It is adjusted to CT22, and it is adjusted to CT23, final adjustment CT2n, until primary data is not sent out
It is raw to change；
Step 6: choosing whether to terminate operation according to demand.
As shown in figure 3, in another embodiment, trend forecasting method includes:
Step 1: drawing the diagonal line of accumulated temperature window, endpoint is the end of current accumulated temperature window on the right side of the diagonal line
Time t0, and by 0~t of period0It is divided into actual measurement 0~t of section timeaWith prediction section time ta~t0；
Step 2: being fitted actual measurement section according to the moisture content of outlet data in the actual measurement section time using least square method and going out saliva
Divide Trendline；
Step 3: according to actual measurement section moisture content of outlet Trendline fitting prediction section moisture content of outlet, and predict current accumulated temperature window
Finish time t0Moisture content of outlet.
Wherein, tyTo select the time.
In another embodiment, the selection of actual measurement section time and prediction section time can be obtained, also by presetting
It can be obtained by precipitation trend in drying process.
In another embodiment, the calculation formula of grain speed is arranged are as follows:
In formula, KfFor correction coefficient, Q is the grain volume of grain discharging wheel discharge in the unit time,S is drying
Machine cross-sectional area, f0To arrange grain frequency, t is the unit time, and V is the grain total volume of grain discharging wheel discharge.
In another embodiment, the adjusting formula of grain frequency is arranged are as follows:
In formula, T1、T2、……、TnFor the cereal temperature that temperature sensor successively acquires, TeFor equilibrium temperature, f0It is current
Arrange grain frequency, HgFor dryer section height, AT0Currently to set accumulated temperature value, HsFor delay section height, v is grain in current drying machine
The speed moved down.
In another embodiment, delay section cereal temperature is by being mounted on the temperature sensor measurement of delay section；Tail gas temperature
Degree is measured by the Temperature Humidity Sensor for being mounted on each dryer section humidity discharging mouth；Grain moisture content is exported by the moisture by being mounted on outlet
Instrument automatically records.
As a preference, δ1=0.5%, δ2=2%.
As shown in figure 4, drying machine, when operation is dried, grain machine 220 will be in melt pit on melt pit conveyer 210 and melt pit
Grain be transported to receiving sieve 230, after the removal of impurities by receiving sieve 230, enter tower premise via the grain discharging opening of receiving sieve 230
Machine 240 is risen, grain is transported to the top of drying machine main body 250 by elevator 240 before tower, and is entered by the grain-entering mouth at top dry
The inside of the main body 250 of dry machine, grain slowly fall in drying machine by the gravity of itself, during the falling process, grain
Grain storage section, dryer section, cooling section, grain discharging section, and the drying in dryer section by heated drying medium can successively be passed through, in cooling
Section grain is cooled down, and drying machine main body finally is discharged via grain discharging section, and the grain that drying machine main body is discharged is defeated via belt
Machine 270 is sent to be transported to solid food storehouse 260, entire drying process terminates.
Wherein, temperature cable 110 is included and is worn dry with multiple temperature-sensing elements of universal serial bus connection and data transmission
Dry each humidity discharging mouth installation of machine, the interior temperature-sensing element energy direct pick-up dryer section hot wind exhaust temperature being distributed；Temperature pick-up
Device 120 connects temperature cable 110, for receiving the temperature signal that temperature-sensing element detects in temperature cable, and is converted to number
The digital signal that can receive according to processor；Data processor 130 be used to receive temperature transmitter 120 transmission temperature signal and
Carry out calculating, display and the storage of temperature zone.
In another embodiment, grain drying is to convey heat into drying machine main body 250 by hot-blast stove and air-heater
Wind.
As shown in figure 5, the laying mode in drying machine main body 250 is as follows:
T01-T03 represents wind-warm syndrome sensor, is mounted on the connecting pin of blower and dryer section, the hot wind for detection blower fan
Temperature；T1 represents temperature cable；TH1 represents Temperature Humidity Sensor；C1-C3 represents adjusting valve；M0 represents import Moisture Meter；M1 generation
Table moisture content of outlet instrument.
The present invention has designed and developed a kind of continuous drying window control method of the grain based on temperature zone, by grain drying
Grain moisture content control in control process is divided into primary control and is precisely controlled two-stage, makes to control precision and stability is higher；Together
When in the actual operation process, drying process can be controlled by graphic method, make that control process is more intuitive, is easier to realize,
Solves the technical issues of non-linear Grain Drying Process control, large time delay.
Although the embodiments of the present invention have been disclosed as above, but its is not only in the description and the implementation listed
With it can be fully applied to various fields suitable for the present invention, for those skilled in the art, can be easily
Realize other modification, therefore without departing from the general concept defined in the claims and the equivalent scope, the present invention is simultaneously unlimited
In specific details and legend shown and described herein.
Claims (7)
1. a kind of continuous drying window control method of grain based on temperature zone, which comprises the steps of:
Step 1: determining the raw grain moisture m of grain to be dried1, Target moisture mt, drying temperature T, primary adjustment period ta, precisely
Adjust period tb, primary control limit δ2, be precisely controlled limit δ1；And
Accumulated temperature window is selected according to the raw grain moisture, the Target moisture and the drying temperature；
Step 2: default row grain speed v0Or row grain frequency f0, and by acquiring delay section grain temperature in Grain Drying Process in real time
Degree or exhaust temperature calculate real-time temperature zone；
Step 3: calculating the difference of present sample time corresponding moisture content of outlet and the Target moisture；
If ti/taFor integer and | m-mt|≤δ2When, the moisture content of outlet and the Target moisture are calculated with the primary adjustment
Period is the trend prediction value at interval；
If the trend prediction value | m-mt| ' > δ1, the accumulated temperature window is adjusted by pid algorithm and adjusts row's grain speed
Or row's grain frequency, make | m-mt|≤δ2And the trend prediction value | m-mt|′≤δ1；
Wherein, tiFor sampling time, i=1,2 ... n, m are the moisture content of outlet, | m-mt| it is the difference, | m-mt| ' for institute
State trend prediction value；
Step 4: the accumulated temperature window is reselected if the raw grain moisture or the drying temperature change, until institute
It states raw grain moisture or the drying temperature is constant；
Step 5: working as ti/tbWhen for integer, calculates the real-time temperature zone and simultaneously keep presently described accumulated temperature window constant, adjust
The length-width ratio of the accumulated temperature window, while row's grain speed or row's grain frequency are adjusted, judge the raw grain moisture or institute
State whether drying temperature changes, if variation, reselects the accumulated temperature window, until the raw grain moisture or the drying
Temperature does not change.
2. the continuous drying window control method of the grain according to claim 1 based on temperature zone, which is characterized in that institute
State the calculation formula that grain speed is arranged in step 2 are as follows:
In formula, KfFor correction coefficient, Q is the grain volume of grain discharging wheel discharge in the unit time,S is that drying machine is horizontal
Area of section, f0To arrange grain frequency, t is the unit time, and V is the grain total volume of grain discharging wheel discharge.
3. the continuous drying window control method of the grain according to claim 2 based on temperature zone, which is characterized in that institute
State real-time temperature zone AT in step 21Calculation formula are as follows:
In formula, HgFor dryer section height, HsFor delay section height, v is the speed that grain moves down in drying machine, T1、
T2、……、TnFor the cereal temperature that temperature sensor successively acquires, TeFor equilibrium temperature.
4. the continuous drying window control method of the grain according to claim 1 based on temperature zone, which is characterized in that institute
The step of stating the trend forecasting method in step 3 include:
Step 1: drawing the diagonal line of presently described accumulated temperature window, endpoint is presently described accumulated temperature window on the right side of the diagonal line
Mouthful end time, and by 0~t of period0It is divided into: actual measurement 0~t of section timeyWith prediction section time ty~(t0-ty)；
Step 2: according to 0~t of the measured time sectionyInterior moisture content of outlet data are fitted actual measurement section using least square method and go out
Saliva divides Trendline；
Step 3: being fitted prediction section moisture content of outlet according to the actual measurement section moisture content of outlet Trendline, and predict going out for end time
Saliva point；
Wherein, t0For the end time；tyTo select the time.
5. the continuous drying window control method of the grain according to claim 1 or 2 based on temperature zone, feature exist
In the adjusting formula of row's grain frequency in the step 3 are as follows:
In formula, T1、T2、……、TnFor the cereal temperature that temperature sensor successively acquires, TeFor equilibrium temperature, f0To arrange grain frequency,
Hg is dryer section height, AT0To set accumulated temperature value, HsFor delay section height, v is the speed that grain moves down in current drying machine
Degree.
6. the continuous drying window control method of the grain according to claim 1 based on temperature zone, which is characterized in that institute
Delay section cereal temperature is stated by being mounted on the temperature sensor measurement of the delay section；The exhaust temperature is by being mounted on each drying
The Temperature Humidity Sensor measurement of section humidity discharging mouth.
7. the continuous drying window control method of the grain according to claim 1 based on temperature zone, which is characterized in that institute
Outlet grain moisture content is stated to be recorded by the Moisture Meter by being mounted on outlet.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113566557A (en) * | 2021-07-28 | 2021-10-29 | 国家粮食和物资储备局科学研究院 | Grain dryer intelligent control method based on deep neural network |
| CN113778153A (en) * | 2021-09-29 | 2021-12-10 | 吉林大学 | Grain continuous drying dual-drive mutual-window control method based on equivalent water potential product |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113566557A (en) * | 2021-07-28 | 2021-10-29 | 国家粮食和物资储备局科学研究院 | Grain dryer intelligent control method based on deep neural network |
| CN113566557B (en) * | 2021-07-28 | 2022-06-07 | 国家粮食和物资储备局科学研究院 | Grain dryer intelligent control method based on deep neural network |
| CN113778153A (en) * | 2021-09-29 | 2021-12-10 | 吉林大学 | Grain continuous drying dual-drive mutual-window control method based on equivalent water potential product |
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