CN117981891A - Automatic control method for temperature of sheet cut tobacco drying sheet - Google Patents
Automatic control method for temperature of sheet cut tobacco drying sheet Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000001035 drying Methods 0.000 title claims abstract description 24
- 241000208125 Nicotiana Species 0.000 title claims description 29
- 235000002637 Nicotiana tabacum Nutrition 0.000 title claims description 29
- 238000012546 transfer Methods 0.000 claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
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- 238000001704 evaporation Methods 0.000 claims description 3
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- 238000012423 maintenance Methods 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 235000019504 cigarettes Nutrition 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
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- 238000004134 energy conservation Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000004364 calculation method Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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Abstract
The invention discloses an automatic control method for the temperature of a sheet wire-drying sheet, which comprises the steps of S1, establishing a sheet temperature control model I, S based on outlet moisture, establishing a sheet temperature control model II based on outlet temperature, S3 model parameter data acquisition and S4 sheet temperature intelligent control; the model I performs feedback control on the sheet temperature according to the set value and the actual value of the sheet outlet moisture, the model II analyzes the heat transfer process of the sheet wire drying stage based on the energy balance principle, performs predictive control on the sheet temperature, and combines the absolute value of the difference between the sheet temperature ① and the sheet temperature ② to automatically and intelligently control the sheet temperature. The automatic control method has the function of compensating the temperature of the thin plate cut-tobacco drier, can automatically and steadily regulate and control the target value, has high model prediction precision, can effectively improve the control accuracy of the cut-tobacco drying procedure, meets the production requirement, and improves the control intelligence level of the thin plate cut-tobacco drier.
Description
Technical Field
The invention relates to the field of tobacco shred production, in particular to an automatic control method for the temperature of a sheet baked shred.
Background
In the tobacco shred manufacturing process of cigarettes, a sheet tobacco dryer is one of important equipment, and is a key equipment for guaranteeing the internal quality of cigarettes. The main function of the tobacco drying machine is to dry the tobacco shreds with higher water content to the water content required by being suitable for being rolled into tobacco branches; the filling capacity of the tobacco shreds is improved, so that the tobacco shreds are further loosened, deformed and curled to increase elasticity, and the filling capacity of the tobacco shreds is improved; the baking process can volatilize and discharge part of green and miscellaneous substances, so that the aroma is exposed, and the smoke smell becomes mellow, so that the quality of the cut tobacco can be improved through baking.
The sheet cut tobacco dryer takes steam as a heat source, a special-shaped sheet heat exchanger in the drying cylinder and a hot air radiator outside the drying cylinder are heated, the tobacco shreds are heated by the sheet and the hot air, so that the tobacco shreds are enabled to volatilize moisture continuously, excessive moisture and impurity gas are discharged through a moisture discharging system, and the adjustment of the moisture of the tobacco shreds at the outlet of the sheet cut tobacco dryer is completed. And the temperature of hot air is stabilized in a mode of adjusting the temperature of the sheet, and the dehydration amount of tobacco shreds is regulated and controlled by controlling the temperature of the sheet, so that the water content at the outlet of the sheet is kept stable. Referring to fig. 2, the conventional control system of the cut-tobacco dryer is currently completed by an outlet moisture feedback PID system, namely, the temperature of the sheet is calculated according to an outlet moisture set value, an outlet moisture actual value and an inlet moisture actual value, and after the outlet moisture meter of the cut-tobacco dryer detects the outlet moisture, the outlet moisture begins to be used as a feedback value to automatically adjust the temperature of the sheet through the outlet moisture PID after a period of time delay. The control mode has the defects of large influence of fluctuation of the water content of the fed material, long time for the temperature of the thin plate to reach the requirement, lag of feedback control and poor stabilizing and controlling effect of the water at the outlet of the thin plate.
Disclosure of Invention
In order to overcome the defects, the invention provides an automatic control method for the temperature of the sheet baked yarn. According to the invention, mass transfer and heat transfer processes in production are analyzed based on an energy conservation theory, the temperature of the sheet is calculated in real time, and meanwhile, outlet moisture feedback control is combined with sheet temperature prediction control based on energy conservation, so that bidirectional correction, equipment state monitoring, abnormal state early warning and the like of the sheet temperature of the sheet cut-tobacco dryer are realized, and the control of the cut-tobacco drying process is more accurate, stable and reliable through the automatic control method, and the accurate control of the sheet temperature is realized.
The technical scheme adopted for solving the technical problems is as follows:
The automatic control method of the temperature of the sheet baked to be cut comprises
S1, establishing a sheet temperature control model I based on outlet moisture
The model carries out feedback control adjustment on the temperature of the thin plate according to the set value of the water content at the outlet of the thin plate and the actual value;
Sheet temperature control model I: t d＝[F1(H1-H2)/(1-H2)]/K1+Tp +d·c;
wherein: f 1 is HT inlet flow, kg/h;
h 1 is HT inlet moisture,%;
H 2 is the set value of the water content at the outlet of the thin plate,%;
T p is the temperature of the thin plate platform and is at the temperature of DEG C;
K 1 is the drying coefficient of the thin plate;
c is the sheet moisture coefficient (which is artificially set, is a constant that determines the regulation temperature range and rate);
d is the sheet outlet moisture deviation (a value calculated from the sheet outlet moisture set value and the actual value);
s2, establishing a sheet temperature control model II based on outlet temperature
The model is based on an energy balance principle, analyzes the heat transfer process of the thin plate in the filament drying stage, and obtains the relationship between the thin plate temperature and the filament outlet temperature by researching the relationship between the thin plate temperature and the heat exchange quantity of the filaments:
obtaining a sheet temperature control model II:
wherein: t D is the steam temperature of the inlet sheet, and T;
AH (T D) is the absolute humidity at saturated vapor pressure of the gas, kg/m 3;
V D is the steam volume flow of the inlet sheet, m 3/h;
t W is the temperature of the condensed water of the thin plate, and the temperature is lower than the temperature;
C W is the enthalpy value of water, J/kg/K;
CW＝1.459×10-6T4-1.971×10-3T3+1.005×T2-228.7T+23750；
ΔH W is the latent heat of evaporation of water, J/kg;
e is a heat conversion efficiency coefficient in the heat transfer process of the thin plate, and the ratio of the heat of the vapor transmitted into the cut tobacco by the thin plate to the heat emitted by the vapor condensate water for heating the thin plate is calculated to obtain:
E＝0.5147；
K 2 is the heat conversion efficiency coefficient of the thin plate heat transfer process;
through researching the energy mechanism relation of the thin plate silk drying process, fitting the relation between the thin plate temperature and the heat transfer coefficient of the cut tobacco, and obtaining the heat transfer coefficient of the cut tobacco through different production states:
f 2 is HT outlet flow, kg/h;
T 1 is HT outlet temperature, DEG C;
T 2 is the outlet temperature of the sheet, DEG C;
s3 model parameter data acquisition
Automatically collecting real-time data of parameters of a sheet temperature control model;
Parameters of the sheet temperature control model I include: a sheet outlet moisture set value, a sheet outlet moisture actual value, an HT inlet flow, an HT inlet moisture;
parameters of the sheet temperature control model II include: sheet inlet steam temperature, sheet inlet steam volume flow, sheet condensate temperature, HT outlet flow, HT outlet temperature, and sheet outlet temperature;
S4 intelligent control of sheet temperature
Obtaining a sheet temperature ① based on the sheet temperature control model I;
obtaining a sheet temperature ② based on the sheet temperature control model II;
When the absolute value of the difference between the sheet temperature ① and the sheet temperature ② is less than or equal to 4.0 ℃, the sheet temperature is controlled stably, and the sheet temperature is controlled mainly by the sheet temperature ①;
When the absolute value of the difference between the sheet temperature ① and the sheet temperature ② is more than 4.0 ℃, the sheet temperature is unstable to control, the actual value of the sheet temperature is obtained through a temperature detection device arranged on a sheet stir-frying plate and is compared with the sheet temperature ①, and according to the comparison result, the steam in a pipeline is heated or cooled through a steam temperature controller arranged on a steam pipeline for feeding the sheet, so that the absolute value of the difference between the sheet temperature ① and the sheet temperature ② reaches the control requirement of less than or equal to 4.0 ℃;
S5 equipment state monitoring and early warning
Based on the energy balance analysis of the sheet temperature control model II, analyzing the mechanism relation among the sheet outlet temperature, the equipment parameters and the process parameters, and carrying out equipment state abnormality monitoring and abnormality factor positioning early warning;
Correlating the sheet temperature ② with equipment state parameters, automatically judging the monitoring logic of verifying the actual value of each parameter factor by a theoretical value according to a model formula when the absolute value of the difference value between the sheet temperature ① and the sheet temperature ② is more than 4.0 ℃, analyzing and positioning abnormal factors and early warning, and realizing equipment state abnormality monitoring;
And starting a corresponding abnormal handling flow, rapidly feeding back the abnormal condition, and carrying out abnormal handling by a maintenance person according to the equipment abnormal state judging result.
The invention has the beneficial effects that:
According to the invention, the temperature control model I based on the outlet moisture and the sheet temperature control model II based on the outlet temperature are combined, the sheet temperature ① is compensated and corrected through the predicted value sheet temperature ②, the hysteresis of sheet temperature control is eliminated, meanwhile, an intelligent early warning system is established on the basis of energy balance as a theoretical basis, key index parameters of sheet temperature related sheet wire drying procedures are compared with theoretical values and actual values in real time, abnormal factors are analyzed and positioned, early warning is carried out, and abnormal monitoring of equipment states is realized.
The automatic control method has the function of compensating the temperature of the thin plate cut-tobacco drier, can automatically and steadily regulate and control the target value, has high model prediction precision, can effectively improve the control accuracy of the cut-tobacco drying procedure, and meets the production requirement.
In addition, the control method can provide basis for timely analysis and adjustment of related personnel, so that abnormal treatment of the sheet cut-tobacco dryer is quick, accurate and efficient, conversion from manual control to intelligent control is realized, and the intelligent level of control of the sheet cut-tobacco dryer is improved.
Drawings
The invention will be further described with reference to the accompanying drawings and specific examples.
FIG. 1 is a schematic flow chart of the method of example 1;
FIG. 2 is a control flow chart of the outlet moisture feedback PID system described in the background art.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the embodiments of the present invention and the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to FIG. 1, the automatic control method for the temperature of the sheet cut tobacco drying sheet comprises
S1, establishing a sheet temperature control model I based on outlet moisture
The model carries out feedback control adjustment on the temperature of the thin plate according to the set value of the water content at the outlet of the thin plate and the actual value;
Sheet temperature control model I: t d＝[F1(H1-H2)/(1-H2)]/K1+Tp +d·c;
wherein: f 1 is HT inlet flow, kg/h;
h 1 is HT inlet moisture,%;
H 2 is the set value of the water content at the outlet of the thin plate,%;
T p is the temperature of the thin plate platform and is at the temperature of DEG C;
K 1 is the drying coefficient of the thin plate;
c is the sheet moisture coefficient (which is artificially set, is a constant that determines the regulation temperature range and rate);
d is the sheet outlet moisture deviation (a value calculated from the sheet outlet moisture set value and the actual value);
s2, establishing a sheet temperature control model II based on outlet temperature
The model is based on an energy balance principle, analyzes the heat transfer process of the thin plate in the filament drying stage, and obtains the relationship between the thin plate temperature and the filament outlet temperature by researching the relationship between the thin plate temperature and the heat exchange quantity of the filaments:
obtaining a sheet temperature control model II:
wherein: t D is the steam temperature of the inlet sheet, and T;
AH (T D) is the absolute humidity at saturated vapor pressure of the gas, kg/m 3;
V D is the steam volume flow of the inlet sheet, m 3/h;
t W is the temperature of the condensed water of the thin plate, and the temperature is lower than the temperature;
C W is the enthalpy value of water, J/kg/K;
CW＝1.459×10-6T4-1.971×10-3T3+1.005×T2-228.7T+23750；
ΔH W is the latent heat of evaporation of water, J/kg;
e is a heat conversion efficiency coefficient in the heat transfer process of the thin plate, and the ratio of the heat of the vapor transmitted into the cut tobacco by the thin plate to the heat emitted by the vapor condensate water for heating the thin plate is calculated to obtain:
E＝0.5147；
K 2 is the heat conversion efficiency coefficient of the thin plate heat transfer process;
through researching the energy mechanism relation of the thin plate silk drying process, fitting the relation between the thin plate temperature and the heat transfer coefficient of the cut tobacco, and obtaining the heat transfer coefficient of the cut tobacco through different production states:
f 2 is HT outlet flow, kg/h;
T 1 is HT outlet temperature, DEG C;
T 2 is the outlet temperature of the sheet, DEG C;
s3 model parameter data acquisition
Automatically collecting real-time data of parameters of a sheet temperature control model;
Parameters of the sheet temperature control model I include: a sheet outlet moisture set value, a sheet outlet moisture actual value, an HT inlet flow, an HT inlet moisture;
parameters of the sheet temperature control model II include: sheet inlet steam temperature, sheet inlet steam volume flow, sheet condensate temperature, HT outlet flow, HT outlet temperature, and sheet outlet temperature;
S4 intelligent control of sheet temperature
Obtaining a sheet temperature ① based on a sheet temperature control model I, wherein the temperature is a control temperature actual value of a sheet cut-tobacco dryer;
Obtaining a sheet temperature ② based on a sheet temperature control model II, wherein the temperature is a control temperature predicted value of a sheet cut-tobacco dryer;
when the absolute value of the difference between the sheet temperature ① and the sheet temperature ② is less than or equal to 4.0 ℃, the sheet temperature is controlled stably, the sheet temperature is controlled by taking the sheet temperature ① as a main part, and the sheet temperature ② is taken as a reference;
When the absolute value of the difference between the sheet temperature ① and the sheet temperature ② is more than 4.0 ℃, the sheet temperature is unstable to control, the actual value of the sheet detection temperature is obtained through a temperature detection device arranged on a sheet stir-frying plate and is compared with the sheet temperature ①, and according to the comparison result, the steam in a pipeline is heated or cooled through a steam temperature controller arranged on a steam pipeline for feeding the sheet, so that the absolute value of the difference between the sheet temperature ① and the sheet temperature ② reaches the control requirement of less than or equal to 4.0 ℃;
S5 equipment state monitoring and early warning
Based on the energy balance analysis of the sheet temperature control model II, analyzing the mechanism relation among the sheet outlet temperature, the equipment parameters and the process parameters, and carrying out equipment state abnormality monitoring and abnormality factor positioning early warning;
Correlating the sheet temperature ② with equipment state parameters, automatically judging the monitoring logic of verifying the actual value of each parameter factor by a theoretical value according to a model formula when the absolute value of the difference value between the sheet temperature ① and the sheet temperature ② is more than 4.0 ℃, analyzing and positioning abnormal factors and early warning, and realizing equipment state abnormality monitoring;
And starting a corresponding abnormal handling flow, rapidly feeding back the abnormal condition, and carrying out abnormal handling by a maintenance person according to the equipment abnormal state judging result.
For example, in the calculation process of the sheet temperature ②, the sheet inlet steam temperature, the sheet inlet steam volume flow, the sheet condensed water temperature, the HT outlet flow, the HT outlet temperature and the sheet outlet temperature are related to the equipment state, when one parameter is abnormal, the abnormal factor can be visually fed back to the equipment state, and the abnormal factor can be checked and the equipment state can be monitored based on the logic.
Example 2
The automatic control method of the sheet temperature of the sheet cut-tobacco drier of the embodiment 1 is applied to the production of the sheet cut-tobacco drying process, and the sheet cut-tobacco drying process is intelligently controlled by combining the sheet temperature feedback value based on the outlet moisture, the sheet temperature predicted value based on the outlet temperature and the sheet temperature measured value, and the system operation statistics are shown in the table 1.
TABLE 1 automatic intelligent control of sheet temperature run statistics
The method can accurately compensate the temperature of the thin plate, and the system is reliable and efficient in operation.
Meanwhile, the method monitors and pre-warns the equipment state, and when the equipment abnormal state is monitored, the abnormal factors are accurately positioned, early warning and prompting are timely carried out on related personnel, and a treatment flow is entered. And after the abnormal state is treated, the early warning is released.
Table 2 shows exemplary different situations of monitoring and early warning of the equipment state based on the method.
TABLE 2
The deviation value of the outlet moisture reflects the discrete degree of the outlet moisture relative to the standard median, and the smaller the value is, the more stable the control of the outlet moisture of the sheet baked wire is.
The average value of the deviation of the outlet water of 10 batches of thin plates with certain brands before and after the automatic control method for the temperature of the thin plates is counted, the result is shown in a table 3, the deviation value is reduced from 0.0337 to 0.0262, and further the application of the method is proved to be capable of effectively improving the stability of the outlet water distribution.
Table 3 example 1 before and after run outlet moisture bias statistics
| Sequence number | Before application | After application |
| 1 | 0.0365 | 0.0242 |
| 2 | 0.029 | 0.0285 |
| 3 | 0.0357 | 0.0269 |
| 4 | 0.0299 | 0.0207 |
| 5 | 0.0297 | 0.0297 |
| 6 | 0.0296 | 0.0258 |
| 7 | 0.0319 | 0.0291 |
| 8 | 0.0357 | 0.0242 |
| 9 | 0.0346 | 0.0265 |
| 10 | 0.0442 | 0.0259 |
| Average value of | 0.0337 | 0.0262 |
Example 3
The embodiment provides an automatic control system for the temperature of a sheet baked yarn, which comprises
The thin plate temperature control model I building unit is used for carrying out feedback control adjustment on the thin plate temperature according to the set value and the actual value of the water content at the thin plate outlet;
The thin plate temperature control model II building unit is used for analyzing the heat transfer process of the thin plate wire drying stage based on the energy balance principle, and further obtaining the thin plate temperature control model II by researching the relationship between the thin plate temperature and the heat exchange quantity between the cut tobacco and obtaining the relationship between the thin plate temperature and the cut tobacco outlet temperature;
The model parameter data acquisition unit is used for automatically acquiring real-time data of parameters of the sheet temperature control model;
The intelligent control unit of the sheet temperature is used for obtaining the sheet temperature ① based on the sheet temperature control model I, obtaining the sheet temperature ② based on the sheet temperature control model II, and then carrying out intelligent control on the sheet temperature based on the absolute value of the difference value of the two;
And the equipment state monitoring and early warning unit is used for analyzing the mechanism relation among the outlet temperature of the thin plate, the equipment parameters and the process parameters based on the energy balance analysis of the thin plate temperature control model II and carrying out equipment state abnormality monitoring and abnormality factor positioning early warning.
Reference is made to embodiment 1 for details not described in this embodiment.
It should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present invention.
Claims (2)
1. The automatic control method for the temperature of the sheet baked to be cut is characterized by comprising the following steps: comprising
S1, establishing a sheet temperature control model I based on outlet moisture
The model carries out feedback control adjustment on the temperature of the thin plate according to the set value of the water content at the outlet of the thin plate and the actual value;
Sheet temperature control model I: t d＝[F1(H1-H2)/(1-H2)]/K1+Tp +d·c;
wherein: f 1 is HT inlet flow, kg/h;
h 1 is HT inlet moisture,%;
H 2 is the set value of the water content at the outlet of the thin plate,%;
T p is a sheet temperature platform, and is at the temperature of DEG C;
K 1 is the drying coefficient of the thin plate;
c is the water coefficient of the thin plate;
d is the deviation of the water content at the outlet of the thin plate;
s2, establishing a sheet temperature control model II based on outlet temperature
The model is based on an energy balance principle, analyzes the heat transfer process of the thin plate in the filament drying stage, and obtains the relationship between the thin plate temperature and the filament outlet temperature by researching the relationship between the thin plate temperature and the heat exchange quantity of the filaments:
obtaining a sheet temperature control model II:
wherein: t D is the steam temperature of the inlet sheet, and T;
AH (T D) is the absolute humidity at saturated vapor pressure of the gas, kg/m 3;
V D is the steam volume flow of the inlet sheet, m 3/h;
t W is the temperature of the condensed water of the thin plate, and the temperature is lower than the temperature;
C W is the enthalpy value of water, J/kg/K;
ΔH W is the latent heat of evaporation of water, J/kg;
e is the heat conversion efficiency coefficient of the thin plate heat transfer process;
K 2 is the heat conversion efficiency coefficient of the thin plate heat transfer process;
through researching the energy mechanism relation of the thin plate silk drying process, fitting the relation between the thin plate temperature and the heat transfer coefficient of the cut tobacco, and obtaining the heat transfer coefficient of the cut tobacco through different production states:
f 2 is HT outlet flow, kg/h;
T 1 is HT outlet temperature, DEG C;
T 2 is the outlet temperature of the sheet, DEG C;
s3 model parameter data acquisition
Automatically collecting real-time data of parameters of a sheet temperature control model;
Parameters of the sheet temperature control model I include: a sheet outlet moisture set value, a sheet outlet moisture actual value, an HT inlet flow, an HT inlet moisture;
parameters of the sheet temperature control model II include: sheet inlet steam temperature, sheet inlet steam volume flow, sheet condensate temperature, HT outlet flow, HT outlet temperature, and sheet outlet temperature;
S4 intelligent control of sheet temperature
Obtaining a sheet temperature ① based on the sheet temperature control model I;
obtaining a sheet temperature ② based on the sheet temperature control model II;
When the absolute value of the difference between the sheet temperature ① and the sheet temperature ② is less than or equal to 4.0 ℃, the sheet temperature is controlled stably, and the sheet temperature is controlled mainly by the sheet temperature ①;
When the absolute value of the difference between the sheet temperature ① and the sheet temperature ② is more than 4.0 ℃, the sheet temperature is unstable to control, the actual value of the sheet temperature is obtained through a temperature detection device arranged on a sheet stir-frying plate and is compared with the sheet temperature ①, and according to the comparison result, the steam in a pipeline is heated or cooled through a steam temperature controller arranged on a steam pipeline for feeding the sheet, so that the absolute value of the difference between the sheet temperature ① and the sheet temperature ② reaches the control requirement of less than or equal to 4.0 ℃.
2. The automatic control method for the temperature of the sheet baked wire according to claim 1, characterized by comprising the steps of:
The automatic control method also comprises the following steps
S5 equipment state monitoring and early warning
Based on the energy balance analysis of the sheet temperature control model II, analyzing the mechanism relation among the sheet outlet temperature, the equipment parameters and the process parameters, and carrying out equipment state abnormality monitoring and abnormality factor positioning early warning;
Correlating the sheet temperature ② with equipment state parameters, automatically judging the monitoring logic of verifying the actual value of each parameter factor by a theoretical value according to a model formula when the absolute value of the difference value between the sheet temperature ① and the sheet temperature ② is more than 4.0 ℃, analyzing and positioning abnormal factors and early warning, and realizing equipment state abnormality monitoring;
And starting a corresponding abnormal handling flow, rapidly feeding back the abnormal condition, and carrying out abnormal handling by a maintenance person according to the equipment abnormal state judging result.
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