CN111831029A - Tobacco redrying temperature control method and device and medium - Google Patents
Tobacco redrying temperature control method and device and medium Download PDFInfo
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- CN111831029A CN111831029A CN202010739242.8A CN202010739242A CN111831029A CN 111831029 A CN111831029 A CN 111831029A CN 202010739242 A CN202010739242 A CN 202010739242A CN 111831029 A CN111831029 A CN 111831029A
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- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- 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
Abstract
The disclosure provides a tobacco redrying temperature control method, a tobacco redrying temperature control device and a storage medium, wherein the method comprises the following steps: when the material head control stage is judged to enter, acquiring a preset valve reference opening value to control the valve opening of a steam heating device in a moisture regain section of the redrying machine; after a preset first duration, determining to enter a normal material passing stage, and controlling the valve opening of the steam heating device by using a preset valve opening control model; when the material tail control stage is judged to enter, controlling the valve opening of the steam heating device based on the valve opening reduction proportion value; after a preset second duration, the valve opening of the steam heating device is controlled using a valve opening control model. The method, the device and the storage medium can realize stable control of the temperature in the moisture regain section of the redrying machine, realize quick response to the stub bar and the stub bar, reduce the material quantity of the stub bar and the stub bar, reduce the labor intensity of operators and improve the product quality.
Description
Technical Field
The invention relates to the technical field of tobacco equipment, in particular to a method and a device for controlling the redrying temperature of tobacco leaves and a storage medium.
Background
The tobacco redrying refers to a process of baking and processing the primary prepared raw tobacco again, and mainly aims to adjust the moisture of the tobacco and facilitate safe storage. The tobacco redrying machine mainly comprises a drying section, a cooling section and a moisture regaining section according to the process characteristics, wherein the moisture regaining section is used for carrying out moisture regaining treatment on dried and cooled leaves, and finally the technical indexes of the process are achieved. The temperature of the moisture regain area has great influence on the moisture absorption speed of the tobacco leaves, the higher the temperature is, the faster the moisture absorption speed of the tobacco leaves is, the higher the temperature control precision is, and the more accurate the moisture control of the tobacco leaves is, so the accurate control of the temperature of the moisture regain area is the key of the accurate control of the moisture of finished products. At present, the defects of large temperature fluctuation, long time required for stabilization and the like exist in the production stage of tobacco redrying, so that the unqualified material quantity is large, and the energy consumption is increased.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method, an apparatus and a storage medium for controlling a redrying temperature of tobacco leaves.
According to a first aspect of the present disclosure, there is provided a tobacco redrying temperature control method, comprising: when the tobacco flake redrying production stage is determined to be the stub bar stage, acquiring a preset valve reference opening value to control the valve opening of a steam heating device in the moisture regain section of the redrying machine; after a preset first duration, determining that the production stage is a normal material passing stage; acquiring a first temperature value acquired by a temperature sensor arranged in a moisture regaining section of the redrying machine, and performing PID control operation by using a PID controller according to a first temperature difference value between the first temperature value and a temperature reference value to adjust the opening of a valve of the steam heating device and adjust the temperature in the moisture regaining section of the redrying machine to the temperature reference value; when the production stage is determined to be a material tail stage, acquiring a preset valve opening reduction proportion value, and controlling the valve opening of the steam heating device based on the valve opening reduction proportion value; and after a preset second duration, acquiring a second temperature value acquired by the temperature sensor, and performing PID control operation by using the PID controller according to a second temperature difference value between the second temperature value and the temperature reference value to adjust the valve opening of the steam heating device and adjust the temperature in the moisture regaining section of the redrying machine to the temperature reference value.
Optionally, when the material starts to enter a moisture regain section of the redrying machine, detecting weight information of the material through a weight detection device, and determining first flow information of the material based on the weight information; and if the first flow information is greater than a preset first flow threshold value and the duration is greater than a preset first time threshold value, determining that the production stage is a stub bar stage.
Optionally, the material is input into an inlet of the moisture regaining section of the redrying machine through a conveying belt and output from an outlet of the moisture regaining section of the redrying machine; the weight detection device comprises an electronic belt scale; wherein the electronic belt scale is located upstream of an inlet of the moisture regain section of the redrying machine relative to the conveying direction of the material.
Optionally, when the production stage is a normal material passing stage, detecting weight information of the material through the weight detection device, and determining second flow information of the material based on the weight information; and if the second flow information is smaller than a preset second flow threshold and the duration is greater than a preset second duration threshold, determining that the production stage is a material tail stage.
Optionally, the valve reference opening value is a valve opening value of the steam heating device collected in the process of processing the material at the moisture regain section of the redrying machine last time.
Optionally, calculating a third temperature deviation in the process of processing the material in the moisture regain section of the redrying machine at the last time; the third temperature deviation is the difference value between the temperature reference value and the current actual temperature in the moisture regain section of the redrying machine; detecting weight information of the material through the weight detection device, and determining third flow information of the material based on the weight information; and if the third flow information is larger than a preset third flow threshold and the duration is larger than a preset third duration threshold, collecting a valve opening value of the steam heating device as the valve reference opening value when the temperature deviation is judged to be within a preset deviation range.
Optionally, the moisture regain section of the redrying machine comprises: a first dampening area and a second dampening area; the temperature sensors are respectively arranged in the first moisture regaining area and the second moisture regaining area, and the steam heating device is respectively provided with valves in the first moisture regaining area and the second moisture regaining area.
According to a second aspect of the present disclosure, there is provided a tobacco redrying temperature control apparatus comprising: the first valve processing module is used for acquiring a preset valve reference opening value to control the valve opening of a steam heating device in a moisture regain section of the redrying machine when judging that the material head control stage is entered; the second valve processing module is used for determining the production stage to be a normal material passing stage after a preset first duration; acquiring a first temperature value acquired by a temperature sensor arranged in a moisture regaining section of the redrying machine, and performing PID control operation by using a PID controller according to a first temperature difference value between the first temperature value and a temperature reference value to adjust the opening of a valve of the steam heating device and adjust the temperature in the moisture regaining section of the redrying machine to the temperature reference value; the third valve processing module is used for acquiring a preset valve opening reduction proportion value when the production stage is determined to be a material tail stage, and controlling the valve opening of the steam heating device based on the valve opening reduction proportion value; and after a preset second duration, acquiring a second temperature value acquired by the temperature sensor, and performing PID control operation by using the PID controller according to a second temperature difference value between the second temperature value and the temperature reference value to adjust the valve opening of the steam heating device and adjust the temperature in the moisture regaining section of the redrying machine to the temperature reference value.
Optionally, the material head stage determining module is configured to detect, by a weight detecting device, weight information of the material when the material starts to enter a moisture regain section of the redrying machine, and determine first flow information of the material based on the weight information; and if the first flow information is greater than a preset first flow threshold value and the duration is greater than a preset first time threshold value, determining that the production stage is a stub bar stage.
Optionally, the material is input into an inlet of the moisture regaining section of the redrying machine through a conveying belt and output from an outlet of the moisture regaining section of the redrying machine; the weight detection device comprises an electronic belt scale; wherein the electronic belt scale is located upstream of an inlet of the moisture regain section of the redrying machine relative to the conveying direction of the material.
Optionally, the material tail stage determining module is configured to detect, by the weight detecting device, weight information of the material when the production stage is a normal material passing stage, and determine second flow information of the material based on the weight information; and if the second flow information is smaller than a preset second flow threshold and the duration is greater than a preset second duration threshold, determining that the production stage is a material tail stage.
Optionally, the valve reference opening value is a valve opening value of the steam heating device collected in the process of processing the material at the moisture regain section of the redrying machine last time.
Optionally, the reference opening determining module is configured to calculate a third temperature deviation in the process of processing the material at the moisture regain section of the redrying machine last time; the third temperature deviation is the difference value between the temperature reference value and the current actual temperature in the moisture regain section of the redrying machine; detecting weight information of the material through the weight detection device, and determining third flow information of the material based on the weight information; and if the third flow information is larger than a preset third flow threshold and the duration is larger than a preset third duration threshold, collecting a valve opening value of the steam heating device as the valve reference opening value when the temperature deviation is judged to be within a preset deviation range.
According to a third aspect of the present disclosure, there is provided a tobacco redrying temperature control apparatus comprising: a memory; and a processor coupled to the memory, the processor configured to perform the method as described above based on instructions stored in the memory.
According to a fourth aspect of the present disclosure, there is provided a computer readable storage medium storing computer instructions for execution by a processor to perform the method as described above.
The tobacco redrying temperature control method, the tobacco redrying temperature control device and the storage medium can realize stable control of the temperature in the moisture regain section of the redrying machine, improve the automation level of the redrying machine, reduce the labor intensity of operators, enable the processed tobacco sheets to be uniform in moisture, improve the quality of products and reduce energy consumption.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without inventive exercise.
FIG. 1 is a schematic flow diagram of one embodiment of a method of controlling the redrying temperature of tobacco leaves according to the present disclosure;
FIG. 2A is a schematic view of a redrying machine; FIG. 2B is a schematic view of the moisture regain section of the redrying machine;
fig. 3 is a schematic flow chart illustrating a process of determining entering a stub bar control stage in an embodiment of a method for controlling a redrying temperature of tobacco according to the present disclosure;
fig. 4 is a schematic flow chart illustrating a process of determining entering a material tail control stage in an embodiment of a tobacco redrying temperature control method according to the present disclosure;
FIG. 5 is a control schematic diagram of a PID control model of valve opening;
FIG. 6 is a block schematic diagram of one embodiment of a tobacco redrying temperature control apparatus according to the present disclosure;
FIG. 7 is a block schematic diagram of another embodiment of a tobacco redrying temperature control apparatus according to the present disclosure;
fig. 8 is a block schematic diagram of yet another embodiment of a tobacco redrying temperature control apparatus according to the present disclosure.
Detailed Description
The present disclosure now will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the disclosure are shown. The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
Fig. 1 is a schematic flow diagram of an embodiment of a tobacco redrying temperature control method according to the present disclosure, as shown in fig. 1:
In one embodiment, the entire normal production process of the tobacco redryer can be divided into three stages: the control stage of the temperature is correspondingly divided into three stages: a stub bar control stage, a normal material passing control stage and a material tail control stage.
The valve reference opening value can be a valve opening value of the steam heating device collected in the process of processing materials in the moisture regain section of the redrying machine at the last time. The steam heating device is arranged in the moisture regain section of the redrying machine and used for heating. The valve of the steam heating device can be a pneumatic film valve and the like, and the temperature in the moisture regain section of the redrying machine can be controlled by adjusting the opening degree of the valve of the steam heating device.
And 102, after the preset first duration, determining that the production stage is a normal material passing stage. The first duration may be set, for example, to 5, 10, 15 seconds, etc.
103, acquiring a first temperature value acquired by a temperature sensor arranged in the moisture regaining section of the redrying machine, and performing PID control operation by using a PID controller according to a first temperature difference value between the first temperature value and a temperature reference value to adjust the opening of a valve of the steam heating device and adjust the temperature in the moisture regaining section of the redrying machine to the temperature reference value;
in one embodiment, the PID controller controls the valve opening using a PID algorithm with the valve opening given at the head stage as a reference value and the temperature reference value as a target. The moisture regain section of the redrying machine comprises: a first dampening area and a second dampening area; a temperature sensor is respectively arranged in the first moisture regain area and the second moisture regain area, and a pneumatic film valve of a steam heating device is respectively arranged in the first moisture regain area and the second moisture regain area; PID controllers can be respectively arranged aiming at the first dampening area and the second dampening area, and the two PID controllers are used for respectively and independently controlling the PID temperatures of the first dampening area and the second dampening area.
And 104, when the production stage is determined to be a material tail stage, acquiring a preset valve opening reduction proportion value, and controlling the valve opening of the steam heating device based on the valve opening reduction proportion value.
And 105, after a preset second duration, acquiring a second temperature value acquired by the temperature sensor, and performing PID control operation by using the PID controller according to a second temperature difference between the second temperature value and the temperature reference value to adjust the valve opening of the steam heating device and adjust the temperature in the moisture regaining section of the redrying machine to the temperature reference value. The second duration may be set, for example, to 5, 10, 15 seconds, etc.
In one embodiment, as shown in fig. 2A and 2B, the smoked sheet redryer consists essentially of: the device comprises a feeding end 1, a mesh pressing belt active and passive section 2, a drying area upper blowing section 3, a drying area lower blowing section 4, a cooling section 5, a moisture exhaust air duct 6, a moisture regaining section 7, a discharging end 8, a pipeline system 9, a conveying mesh belt 10, a heat preservation door plate 11 and the like. The moisture regain section 7 includes a first moisture regain area and a second moisture regain area.
Fig. 3 is a schematic flow chart of the stage of determining to enter the stub bar control in an embodiment of the method for controlling the redrying temperature of tobacco leaves according to the present disclosure, as shown in fig. 3:
The materials are input into the inlet of the moisture regaining section of the redrying machine through the conveying belt and output from the outlet of the moisture regaining section of the redrying machine. The weight detection device comprises an electronic belt scale and the like, and relative to the conveying direction of the materials, the electronic belt scale is positioned at the upstream of the inlet of the moisture regain section of the redrying machine. The electronic belt scale is used for detecting the weight of the materials conveyed on the conveying belt, and the flow information of the materials can be obtained according to the weight of the materials detected by the electronic belt scale and the detection time.
In one embodiment, the first flow threshold may be 4000kg/h, etc., and the first duration threshold may be 70 seconds, etc. For example, the first time threshold is the time for the material to reach the inlet from the electronic belt scale + the distance for the material to reach the moisture zone from the inlet of the redrying machine/the running speed of the conveyor belt. And when the stub bar control stage is judged to be entered, setting the valve opening degree of the steam heating device as a valve reference opening degree value.
When the feeding production is just started or the material interruption recovery production is started, when the first flow rate of the material obtained by the electronic belt scale is greater than 4000Kg/h and the duration is greater than a preset first time threshold value for 70 seconds, the control of the valve is set as the valve reference opening value, and the first duration is kept, wherein the first duration can be set, for example, 5 seconds, 10 seconds and the like.
And after the first duration, determining to enter a normal material passing stage, and controlling the valve opening of the steam heating device by using a preset valve opening control model. Through the stub bar control stage, can provide the initial value of a valve aperture for the automatic control of normal punishment in advance control stage, make the regulation of valve aperture need not start from 0, can not cause the rapid decline of temperature because of the material arrives the back.
Fig. 4 is a schematic flow chart of the step of determining to enter the material tail control stage in an embodiment of the tobacco redrying temperature control method according to the disclosure, as shown in fig. 4:
And 402, if the second flow information is smaller than a preset second flow threshold and the duration is greater than a preset second duration threshold, judging that the material tail control stage is entered.
In one embodiment, the second flow threshold may be 3500kg/h, etc., and the second duration threshold may be 90 seconds, etc. And after entering a normal material passing stage, when the second flow information obtained by the electronic belt scale is less than 3500kg/h and the duration is greater than a preset second duration threshold value for 90 seconds, judging that a material tail control stage is entered.
The valve opening degree reduction ratio value may be set, for example, to 13%, 15%, or the like. When the material tail control stage is judged to enter, the valve opening of the steam heating device is controlled based on the valve opening reduction proportion value of 13%, namely the current valve opening is reduced by 13%, and a second duration is kept, wherein the second duration can be set to be 5 seconds, 10 seconds and the like, for example.
When the production of the batch is finished or the batch is cut off, when the second flow information obtained by the electronic belt scale is less than 3500Kg/h of the second flow threshold and the continuous time length is greater than the second time length threshold, the material tail control stage is judged to enter, and the current valve opening is reduced by 13%. After the second duration, controlling a valve opening of the steam heating device using a valve opening control model.
The preset opening degree of the valve opening degree can be used as the initial opening degree of the valve opening degree control model adjustment in the material tail control stage, the valve opening degree can be adjusted without starting from the current value by providing a lower reference value, and the temperature can not rise rapidly after the material leaves.
In one embodiment, the temperature deviation is calculated in the process of processing materials in the moisture regain section of the previous redrying machine; and the temperature deviation is the difference between the temperature reference value and the current actual temperature in the moisture regain section of the redrying machine. And detecting weight information of the material through a weight detection device, and determining third flow information of the material based on the weight information. And if the third flow information is larger than a preset third flow threshold value and the duration is larger than a preset third duration threshold value, collecting a valve opening value of the steam heating device as a valve reference opening value when the temperature deviation is judged to be within a preset deviation range.
In one embodiment, SP _ PV is SP-PV; wherein SP _ PV is the temperature deviation, SP is the temperature reference value, and PV is the current actual temperature measurement value. The third flow threshold may be 4000Kg/h, etc., and the third time period threshold may be 2 minutes, 3 minutes, etc.
And when the third flow information of the material obtained through the electronic belt is larger than a third flow threshold value 4000Kg/h and the continuous time is larger than a third time threshold value for 3 minutes, if the temperature deviation is judged to be within a preset deviation range by-0.5 ℃ and SP _ PV <0.5 ℃, collecting a valve opening value of the steam heating device as a valve reference opening value.
In one embodiment, a PID controller is used for controlling the opening degree of a valve of the steam heating device, the current actual temperature in the moisture regain section of the redrying machine is obtained, and the temperature difference between the current actual temperature and the temperature reference value is calculated; and adjusting a control coefficient of the PID controller for PID control operation, and adjusting the opening of the steam valve according to the temperature difference value so as to control the temperature and control the temperature in the moisture regain section of the redrying machine.
The PID controller performs PID control of the valve opening degree by taking the valve opening degree set in the material head control stage and the material tail control stage as a reference and taking the set temperature value as a target. PID is an abbreviation of three adjusting parameters of Proportion (proportionality), Integral (Integral) and Differential (derivative), and Proportion (proportionality), Integral (Integral) and Differential (Differential) of deviation are linearly combined to form a control quantity, and the control quantity is used to control the controlled object. The PID control model of the valve opening is a linear regulator, and the proportion (P), the integral (I) and the differential (D) of the deviation of a given value r (t) and an actual output value c (t) are linearly combined to form a control quantity to control a control object.
As shown in fig. 5, in the process control, the PID controller controls the deviation according to the proportion (P), the integral (I) and the derivative (D), and has the advantages of mutually independent control parameters, simpler parameter selection, and the like. The temperature deviation value is subjected to proportional P, integral I and differential D operation and then is linearly combined to form an output value du as up + ui + ud, the opening degree of the valve is controlled, and finally the opening degree of the valve is changed in a control signal mode, so that real-time and accurate closed-loop control over the temperature is realized.
The PID controller detects the current actual temperature (actually measured temperature) PV in the moisture regain section of the redrying machine through the temperature sensor, the temperature reference value (set temperature) is SP, a temperature deviation is obtained through SP-PV, the PID controller adjusts an output valve according to the temperature deviation according to the principle of PID, and if the deviation is large/small, the opening of a steam valve is increased/reduced so that the temperature reaches a steady-state value. The PID controller controls the temperature of the redrying and moisture returning area of the leaves, compares the set temperature with the actual temperature measured by the sensor and then performs PID operation, and outputs and controls the opening of the pneumatic film valve so as to stabilize the temperature within a certain range.
The PID controller is an industrial controller which is widely used, has the advantages of simple principle, convenient use, strong adaptability and strong robustness, the control quality of the PID controller is not sensitive to the change of a controlled object, the temperature control of a tidal back zone has low requirements on the rapidity and the control precision of a system, and the reliability of the system is emphasized, so that higher cost performance can be obtained by using the PID controller. The PID controller consists of a proportional unit P, an integral unit I and a differential unit D. The basis of PID control is proportional control; integral control may eliminate steady state errors, but may increase overshoot; differential control can accelerate the response speed of the large inertia system and weaken the overshoot tendency. The relationship of each parameter in the PID is as follows: u (t) ═ p [ e (t) +1/I ^ e (t) dt + D × de (t)/dt (e (t)) is the difference between the set value and the actual value.
In one embodiment, the phenomena of head and tail are common phenomena in the production process, and can happen at any time in the production process, such as the beginning and the end of the production, the changing of cards and the abnormal material breaking. According to the requirements of the tobacco production process, the relative humidity in the moisture regain section is more than 95%, and the tobacco leaves absorb moisture while absorbing heat in the moisture regain section. In the generation process, the rapidly increased stub bar materials reach the moisture regain section after passing through the cooling area, and can absorb a large amount of heat, so that the temperature of the moisture regain section is suddenly reduced, and finally, the tobacco leaves are insufficiently moisturized; the rapidly reduced material tail material can cause the temperature of the moisture regaining section to suddenly rise, so that the tobacco leaves absorb too much moisture and become damp. Because the existing temperature control of the moisture regain section has problems, the unqualified material quantity of the stub bar and the stub bar tail is large, and therefore the temperature control of the system on the stub bar and the stub bar tail needs to be increased.
When the tobacco redrying temperature control method disclosed by the invention is used in practical production, the stub bar stabilizing time is reduced to 5M12S from 27M30S before optimization, the quantity of materials on the stub bar is not easy to control and is reduced to 780Kg from 4125Kg each time, and the quantity of materials on the tail of blanking is not easy to control and is reduced to 112Kg from 182Kg each time and is reduced by 30%. The temperature fluctuation range, the outlet moisture variation range and the outlet moisture fluctuation range of the produced tobacco leaves with the same grade are analyzed, the temperature fluctuation range is improved from +/-1.0-1.7 ℃ in 2016 to +/-0.2-0.8 ℃ in 2017, the +/-1.0 ℃ range meeting economic indexes is met, the outlet moisture fluctuation range is improved from 1.0-3.2% in 2016 to 0.4-1.3% in 2017, and the quality stability is improved.
In one embodiment, as shown in fig. 6, the present disclosure provides a tobacco redrying temperature control apparatus 80 comprising: a first valve treatment module 61, a second valve treatment module 62 and a third valve treatment module 63.
When the material head control stage is judged to be started, the first valve processing module 61 obtains a preset valve reference opening value to control the valve opening of the steam heating device in the moisture regain section of the redrying machine. After a preset first duration, the second valve processing module 62 determines that the production phase is a normal skip phase.
The second valve processing module 62 obtains a first temperature value acquired by a temperature sensor arranged in the moisture regain section of the redrying machine, and performs PID control operation by using a PID controller according to a first temperature difference between the first temperature value and a temperature reference value to adjust the valve opening of the steam heating device and adjust the temperature in the moisture regain section of the redrying machine to the temperature reference value.
When the production stage is determined to be the material tail stage, the third valve processing module 63 obtains a preset valve opening reduction proportion value, and controls the valve opening of the steam heating device based on the valve opening reduction proportion value.
After a preset second duration, the third valve processing module 63 obtains a second temperature value acquired by the temperature sensor, and performs PID control operation by using the PID controller according to a second temperature difference between the second temperature value and the temperature reference value, so as to adjust the valve opening of the steam heating device and adjust the temperature in the moisture regain section of the redrying machine to the temperature reference value.
In one embodiment, as shown in fig. 7, the tobacco redrying temperature control device 60 further comprises a stub bar stage determining module 64, a tail bar stage determining module 65 and a reference opening determining module 66. When the material starts to enter the moisture regain section of the redrying machine, the material head stage determining module 64 detects the weight information of the material through the weight detecting device, and determines the first flow information of the material based on the weight information. If the first flow information is greater than the preset first flow threshold and the duration is greater than the preset first duration threshold, the head stage determining module 64 determines to enter the head control stage.
After entering the normal material passing stage, the material tail stage determining module 65 detects weight information of the material through the weight detecting device, and determines second flow information of the material based on the weight information. If the second flow information is smaller than the preset second flow threshold and the duration is greater than the preset second duration threshold, the material tail stage determining module 65 determines to enter the material tail control stage.
The valve reference opening value is the valve opening value of the steam heating device collected in the process of processing materials in the moisture regain section of the redrying machine at the last time. The reference opening degree determining module 66 calculates a third temperature deviation in the process of processing the materials in the moisture regain section of the previous redrying machine; the third temperature deviation is the difference value between the temperature reference value and the current actual temperature in the moisture regain section of the redrying machine.
The reference opening determining module 66 detects weight information of the material through the weight detecting device, and determines third flow rate information of the material based on the weight information. If the third flow information is greater than the preset third flow threshold and the duration is greater than the preset third duration threshold, the reference opening determining module 66 collects a valve opening value of the steam heating device as a valve reference opening value when the temperature deviation is judged to be within the preset deviation range.
Fig. 8 is a block schematic diagram of yet another embodiment of a tobacco redrying temperature control apparatus according to the present disclosure. As shown in fig. 8, the apparatus may include a memory 81, a processor 82, a communication interface 83, and a bus 84. The memory 81 is used for storing instructions, the processor 82 is coupled to the memory 81, and the processor 82 is configured to execute the tobacco redrying temperature control method based on the instructions stored in the memory 81.
The memory 81 may be a high-speed RAM memory, a non-volatile memory (non-volatile memory), or the like, and the memory 81 may be a memory array. The storage 81 may also be partitioned and the blocks may be combined into virtual volumes according to certain rules. The processor 82 may be a central processing unit CPU, or an application specific integrated circuit asic, or one or more integrated circuits configured to implement the tobacco redrying temperature control methods of the present disclosure.
In one embodiment, the present disclosure provides a computer-readable storage medium storing computer instructions that, when executed by a processor, implement a tobacco redrying temperature control method as in any one of the above embodiments.
According to the tobacco redrying temperature control method, the tobacco redrying temperature control device and the storage medium in the embodiment, the temperature in the moisture regain section of the redrying machine can be stably controlled, the automation level of the tobacco redrying machine is improved, the labor intensity of operators is reduced, the moisture of processed tobacco sheets is uniform, and the product quality is improved.
The method and system of the present disclosure may be implemented in a number of ways. For example, the methods and systems of the present disclosure may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of the method is for illustration only, and the steps of the method of the present disclosure are not limited to the order specifically described above unless specifically stated otherwise. Further, in some embodiments, the present disclosure may also be embodied as programs recorded in a recording medium, the programs including machine-readable instructions for implementing the methods according to the present disclosure. Thus, the present disclosure also covers a recording medium storing a program for executing the method according to the present disclosure.
The description of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the disclosure in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the disclosure and the practical application, and to enable others of ordinary skill in the art to understand the disclosure for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (15)
1. A tobacco redrying temperature control method comprises the following steps:
when the tobacco flake redrying production stage is determined to be the stub bar stage, acquiring a preset valve reference opening value to control the valve opening of a steam heating device in the moisture regain section of the redrying machine;
after a preset first duration, determining that the production stage is a normal material passing stage;
acquiring a first temperature value acquired by a temperature sensor arranged in a moisture regaining section of the redrying machine, and performing PID control operation by using a PID controller according to a first temperature difference value between the first temperature value and a temperature reference value to adjust the opening of a valve of the steam heating device and adjust the temperature in the moisture regaining section of the redrying machine to the temperature reference value;
when the production stage is determined to be a material tail stage, acquiring a preset valve opening reduction proportion value, and controlling the valve opening of the steam heating device based on the valve opening reduction proportion value;
and after a preset second duration, acquiring a second temperature value acquired by the temperature sensor, and performing PID control operation by using the PID controller according to a second temperature difference value between the second temperature value and the temperature reference value to adjust the valve opening of the steam heating device and adjust the temperature in the moisture regaining section of the redrying machine to the temperature reference value.
2. The method of claim 1, further comprising:
when a material begins to enter a moisture regain section of a redrying machine, detecting weight information of the material through a weight detection device, and determining first flow information of the material based on the weight information;
and if the first flow information is greater than a preset first flow threshold value and the duration is greater than a preset first time threshold value, determining that the production stage is a stub bar stage.
3. The method of claim 2, wherein,
the materials are input into an inlet of the moisture regaining section of the redrying machine through a conveying belt and output from an outlet of the moisture regaining section of the redrying machine; the weight detection device comprises an electronic belt scale; wherein the electronic belt scale is located upstream of an inlet of the moisture regain section of the redrying machine relative to the conveying direction of the material.
4. The method of claim 2, further comprising:
when the production stage is a normal material passing stage, detecting weight information of the material through the weight detection device, and determining second flow information of the material based on the weight information;
and if the second flow information is smaller than a preset second flow threshold and the duration is greater than a preset second duration threshold, determining that the production stage is a material tail stage.
5. The method of claim 2, wherein said valve reference opening value is a valve opening value of said steam heating device collected during a last time said material was processed at a moisture regain stage of said redryer.
6. The method of claim 5, further comprising:
calculating a third temperature deviation in the process of processing the materials in the moisture regain section of the redrying machine at the last time;
the third temperature deviation is the difference value between the temperature reference value and the current actual temperature in the moisture regain section of the redrying machine;
detecting weight information of the material through the weight detection device, and determining third flow information of the material based on the weight information;
and if the third flow information is larger than a preset third flow threshold and the duration is larger than a preset third duration threshold, collecting a valve opening value of the steam heating device as the valve reference opening value when the temperature deviation is judged to be within a preset deviation range.
7. The method of claim 1, wherein,
the moisture regain section of the redrying machine comprises: a first dampening area and a second dampening area;
the temperature sensors are respectively arranged in the first moisture regaining area and the second moisture regaining area, and the steam heating device is respectively provided with valves in the first moisture regaining area and the second moisture regaining area.
8. A tobacco redrying temperature control device comprises:
the first valve processing module is used for acquiring a preset valve reference opening value to control the valve opening of a steam heating device in a moisture regain section of the redrying machine when judging that the material head control stage is entered;
the second valve processing module is used for determining the production stage to be a normal material passing stage after a preset first duration; acquiring a first temperature value acquired by a temperature sensor arranged in a moisture regaining section of the redrying machine, and performing PID control operation by using a PID controller according to a first temperature difference value between the first temperature value and a temperature reference value to adjust the opening of a valve of the steam heating device and adjust the temperature in the moisture regaining section of the redrying machine to the temperature reference value;
the third valve processing module is used for acquiring a preset valve opening reduction proportion value when the production stage is determined to be a material tail stage, and controlling the valve opening of the steam heating device based on the valve opening reduction proportion value; and after a preset second duration, acquiring a second temperature value acquired by the temperature sensor, and performing PID control operation by using the PID controller according to a second temperature difference value between the second temperature value and the temperature reference value to adjust the valve opening of the steam heating device and adjust the temperature in the moisture regaining section of the redrying machine to the temperature reference value.
9. The temperature control device of claim 8, further comprising:
the material head stage determining module is used for detecting weight information of the material through a weight detecting device when the material starts to enter a moisture regaining section of the redrying machine, and determining first flow information of the material based on the weight information; and if the first flow information is greater than a preset first flow threshold value and the duration is greater than a preset first time threshold value, determining that the production stage is a stub bar stage.
10. The temperature control apparatus of claim 9,
the materials are input into an inlet of the moisture regaining section of the redrying machine through a conveying belt and output from an outlet of the moisture regaining section of the redrying machine; the weight detection device comprises an electronic belt scale; wherein the electronic belt scale is located upstream of an inlet of the moisture regain section of the redrying machine relative to the conveying direction of the material.
11. The temperature control device of claim 9, further comprising:
the material tail stage determining module is used for detecting the weight information of the material through the weight detecting device when the production stage is a normal material passing stage, and determining second flow information of the material based on the weight information; and if the second flow information is smaller than a preset second flow threshold and the duration is greater than a preset second duration threshold, determining that the production stage is a material tail stage.
12. The temperature control device of claim 9, wherein the valve reference opening value is a valve opening value of the steam heating device collected during a last material processing procedure at a moisture regain stage of the redrying machine.
13. The temperature control device of claim 12, further comprising:
the reference opening degree determining module is used for calculating a third temperature deviation in the process of processing materials in the moisture regain section of the redrying machine at the last time; the third temperature deviation is the difference value between the temperature reference value and the current actual temperature in the moisture regain section of the redrying machine; detecting weight information of the material through the weight detection device, and determining third flow information of the material based on the weight information; and if the third flow information is larger than a preset third flow threshold and the duration is larger than a preset third duration threshold, collecting a valve opening value of the steam heating device as the valve reference opening value when the temperature deviation is judged to be within a preset deviation range.
14. A tobacco redrying temperature control device comprises:
a memory; and a processor coupled to the memory, the processor configured to perform the method of any of claims 1-7 based on instructions stored in the memory.
15. A computer-readable storage medium having stored thereon computer instructions for execution by a processor of the method of any one of claims 1 to 7.
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