CN111165866A - Quality control method and system based on airflow type cut stem drying - Google Patents
Quality control method and system based on airflow type cut stem drying Download PDFInfo
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- CN111165866A CN111165866A CN201911272937.3A CN201911272937A CN111165866A CN 111165866 A CN111165866 A CN 111165866A CN 201911272937 A CN201911272937 A CN 201911272937A CN 111165866 A CN111165866 A CN 111165866A
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
- A24B9/00—Control of the moisture content of tobacco products, e.g. cigars, cigarettes, pipe tobacco
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
- A24B3/00—Preparing tobacco in the factory
- A24B3/04—Humidifying or drying tobacco bunches or cut tobacco
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Abstract
The invention provides a quality control method and a system based on airflow type cut stem drying, wherein the method comprises the following steps: acquiring a hot air temperature target value and an outlet water content target value in a cut stem drying procedure; establishing a temperature feedback control model of the hot air temperature and the opening of a steam valve, and controlling the opening of the steam valve according to the temperature feedback control model and the target value of the hot air temperature so as to control the temperature of the hot air in the dryer; acquiring a measured value of the outlet moisture content of the cut stem drying process, and acquiring a target deviation value of the outlet moisture content according to the target value and the measured value; and establishing a moisture content PID feedback control model for adjusting the hot air speed according to the target deviation value so as to perform feedback control on the moisture content of the outlet, so that the moisture content of the outlet of the cut stem drying process outlet material in the batch is controlled according to the target value. The method can improve the batch consistency of the moisture content of the cut stem drying outlet and improve the quality control capability in the production process.
Description
Technical Field
The invention relates to the technical field of tobacco processing, in particular to a quality control method and system for leaf-based airflow type cut stem drying.
Background
At present, in the cut tobacco production process of cigarette production enterprises, airflow type expansion drying equipment is mostly adopted for cut tobacco drying, and the main process aims at removing excessive moisture in the cut tobacco, improving the filling capacity and the processing resistance of the cut tobacco and improving the sensory quality of the cut tobacco. Therefore, the moisture content of the outlet is the most important process control index of the cut stem drying process and is a key process quality characteristic influencing the cigarette quality. At present, cigarette manufacturing enterprises take the moisture content of a material at a cut stem drying outlet as an important index of a cut stem drying process, the main control method is to control the upper limit and the lower limit according to the moisture content standard of the material at the cut stem drying outlet, and some enterprises adopt the control of the upper limit and the lower limit plus standard deviation, so that the moisture of cut stems is not uniform easily, and the quality control in the production process is not facilitated.
Disclosure of Invention
The invention provides a quality control method and a quality control system based on airflow type cut stem drying, which solve the problem that the change control of the water content of the cut stems at the outlet is not uniform in the existing cut stem drying process, can improve the batch consistency of the water content of the cut stem drying outlet, and improve the quality control capability in the production process.
In order to achieve the above purpose, the invention provides the following technical scheme:
a quality control method based on airflow type cut stem drying comprises the following steps:
acquiring a hot air temperature target value and an outlet water content target value in a cut stem drying procedure;
establishing a temperature feedback control model of the hot air temperature and the opening of a steam valve, and controlling the opening of the steam valve according to the temperature feedback control model and the target value of the hot air temperature so as to control the temperature of the hot air in the dryer;
acquiring a measured value of the outlet moisture content of the cut stem drying process, and acquiring a target deviation value of the outlet moisture content according to the target value and the measured value;
and establishing a moisture content PID feedback control model for adjusting the hot air speed according to the target deviation value so as to perform feedback control on the moisture content of the outlet, so that the moisture content of the outlet of the cut stem drying process outlet material in the batch is controlled according to the target value.
Preferably, the method further comprises the following steps:
acquiring outlet water content and hot air speed in a cut stem drying procedure within set time in real time, and fitting according to a time relation to obtain a regression fitting function of the outlet water content and the hot air speed;
and determining the value range of the PID parameters according to the regression fitting function, so that the water content PID feedback control model performs PID parameter adjustment according to the value range in the cut stem drying process in the same batch.
Preferably, the method further comprises the following steps:
collecting a value sample of the water content of the outlet of each batch, and calculating the mean square error of each batch after each batch is finished;
and if the mean square errors of two continuous batches are continuously increased, adjusting the PID parameters in the water content PID feedback control model.
Preferably, the method further comprises the following steps:
the temperature feedback control model for establishing the hot air temperature and the steam valve opening comprises the following steps:
the temperature feedback control model divides the actual value of the hot air temperature into N intervals by taking the target value of the hot air temperature as the center, determines the steam valve openings corresponding to different intervals, and controls the steam valve openings to reach corresponding values according to the interval where the actual value of the hot air temperature is located so as to realize the control of the hot air temperature.
Preferably, the method further comprises the following steps:
the temperature feedback control model for establishing the hot air temperature and the steam valve opening further comprises:
acquiring a measured value of the hot air temperature, and calculating to obtain a temperature difference value according to the target value of the hot air temperature;
and establishing a temperature PID feedback control model, and adjusting the opening of a steam valve according to the temperature difference value so as to control the temperature of hot air.
The invention also provides a quality control system based on airflow type cut stem drying, which comprises:
the first acquisition unit is used for acquiring a hot air temperature target value and an outlet moisture content target value in a cut stem drying procedure;
the temperature control unit is used for establishing a temperature feedback control model of the temperature of the hot air and the opening of the steam valve, and controlling the opening of the steam valve according to the temperature feedback control model and the target value of the temperature of the hot air so as to control the temperature of the hot air in the dryer;
the second acquisition unit is used for acquiring an actual measurement value of the outlet moisture content of the cut stem drying process and acquiring a target deviation value of the outlet moisture content according to the target value and the actual measurement value;
and the moisture content control unit is used for establishing a moisture content PID feedback control model and is used for adjusting the hot air speed according to the target deviation value so as to perform feedback control on the moisture content of the outlet, so that the moisture content of the outlet of the cut stem drying process outlet material in the batch is controlled according to the target value.
Preferably, the method further comprises the following steps:
the fitting unit is used for acquiring the outlet water content and the hot air speed in the cut stem drying process within set time in real time, and fitting according to the time relationship to obtain a regression fitting function of the outlet water content and the hot air speed;
and the first PID parameter adjusting unit is used for determining the value range of the PID parameters according to the regression fitting function, so that the moisture content PID feedback control model can carry out PID parameter adjustment according to the value range in the cut stem drying process in the same batch.
Preferably, the method further comprises the following steps:
the error calculation unit is used for acquiring the value sample of the water content of the outlet of each batch and calculating the mean square error of each batch after each batch is finished;
and the second PID parameter adjusting unit is used for adjusting the PID parameters in the water content PID feedback control model when the mean square errors of two continuous batches are continuously increased.
Preferably, the temperature control unit includes:
and the temperature partition control module is used for dividing the actual value of the hot air temperature into N intervals by taking the target value of the hot air temperature as a center, determining the opening of the steam valve corresponding to different intervals, and controlling the opening of the steam valve to reach a corresponding value according to the interval where the actual value of the hot air temperature is located so as to realize the control of the hot air temperature.
Preferably, the temperature control unit further includes:
the temperature PID control module is used for acquiring a hot air temperature measured value and calculating a temperature difference value according to the hot air temperature target value;
and establishing a temperature PID feedback control model, and adjusting the opening of a steam valve according to the temperature difference value so as to control the temperature of hot air.
The invention provides a quality control method and a quality control system based on airflow type cut stem drying, wherein the opening of a steam valve and the injection quantity of a feed liquid are respectively adjusted by setting a PID (proportion integration differentiation) feedback control model for controlling the opening of an inlet and an outlet of a temperature feedback control module so as to control the temperature of hot air and the water content of the outlet, so that the problem of non-uniformity in controlling the change of the water content of the outlet cut stem in the conventional cut stem drying process is solved, the batch consistency of the water content of the cut stem drying outlet can be improved, and the quality control capability in the production.
Drawings
In order to more clearly describe the specific embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below.
Fig. 1 and 2 are schematic diagrams of a quality method based on airflow type cut stem drying provided by the invention.
Detailed Description
In order to make the technical field of the invention better understand the scheme of the embodiment of the invention, the embodiment of the invention is further described in detail with reference to the drawings and the implementation mode.
The problem of uneven control exists to the moisture content change of export stalk silk in the current stalk silk drying process. The invention provides a quality control method and a quality control system based on airflow type cut stem drying, wherein the opening of a steam valve and the injection quantity of a feed liquid are respectively adjusted by setting a PID (proportion integration differentiation) feedback control model for controlling the opening of an inlet and an outlet of a temperature feedback control module so as to control the temperature of hot air and the water content of the outlet, so that the problem of non-uniformity in controlling the change of the water content of the outlet cut stem in the conventional cut stem drying process is solved, the batch consistency of the water content of the cut stem drying outlet can be improved, and the quality control capability in the production.
As shown in fig. 1, a method for controlling moisture content at an outlet of a cut stem drying process includes:
s1: acquiring a hot air temperature target value and an outlet water content target value in a cut stem drying procedure;
s2: and establishing a temperature feedback control model of the hot air temperature and the opening of the steam valve, and controlling the opening of the steam valve according to the temperature feedback control model and the target value of the hot air temperature so as to control the temperature of the hot air in the dryer.
S3: and acquiring an actual measurement value of the moisture content of the outlet of the cut stem drying process, and acquiring a target deviation value of the moisture content of the outlet according to the target value and the actual measurement value.
S4: and establishing a moisture content PID feedback control model for adjusting the hot air speed according to the target deviation value so as to perform feedback control on the moisture content of the outlet, so that the moisture content of the outlet of the cut stem drying process outlet material in the batch is controlled according to the target value.
Specifically, in the production process of the cut stem drying process, the moisture content of the outlet can be influenced and controlled through the aspects of the cylinder wall temperature, the hot air flow, the moisture exhaust air quantity and the like. In order to avoid instability of the production process caused by simultaneous action of a plurality of influence factors, a plurality of influence variables can be respectively fixed at a proper value, and only one influence factor is adjusted to control the water content of the outlet. According to the method, the adjustment of the water content of the outlet is realized by adjusting the air speed of the hot air and further adjusting the steam flow. The PID feedback control model is used for adjusting the water content of the outlet in real time, comparing an actual measurement value of the water content of the outlet with a target value, then taking the actual measurement value of the water content of the outlet as the input of the PID feedback control model according to a target deviation value, carrying out self-adaptive learning according to the input hot air speed, and further determining and adjusting parameter values of P, I and D, so that the control of the water content of the outlet is realized, the stability of the control of the water content of the outlet in batches is improved, and the consistency of the control between batches is increased.
As shown in fig. 2, the method further comprises:
s5: acquiring outlet water content and hot air speed in a cut stem drying procedure within set time in real time, and fitting according to a time relation to obtain a regression fitting function of the outlet water content and the hot air speed;
s6: and determining the value range of the PID parameters according to the regression fitting function, so that the water content PID feedback control model performs PID parameter adjustment according to the value range in the cut stem drying process in the same batch.
Specifically, before modeling the control process of cut stem drying by regression analysis, the input (i.e., control parameters) and output (control result) of the control process are first determined. The current control mode can be that the influence parameters such as the temperature of the cylinder wall, the temperature of hot air, the moisture-removing negative pressure and the like are kept fixed, and the feedback control of the water content of the outlet is realized by adjusting the speed of the hot air. If the moisture content of the outlet is higher, the hot air speed is reduced to reduce the steam flow, and further reduce the moisture content of the outlet, and if the moisture content of the outlet is lower, the hot air speed is increased to increase the steam flow, so that the moisture content of the outlet is increased. The control of the hot air speed is mainly automatically completed through a PID feedback control model, and an operator can manually adjust the hot air speed according to actual conditions.
As shown in fig. 2, the method further comprises:
s7: and collecting a value sample of the water content of the outlet of each batch, and calculating the mean square error of each batch after each batch is finished.
S8: and if the mean square errors of two continuous batches are continuously increased, adjusting the PID parameters in the water content PID feedback control model.
Specifically, after each batch is finished, the quality consistency of the batch is analyzed, a lot of evaluation methods are available for batch quality, and a relatively simple and common evaluation method is adopted to calculate the Mean Square Error (MSE):
wherein n is the number of samples obtained in each batch, yiTaking the value of the water content of the outlet in each sample, yTThe mean value of the water content at the outlet.
In practical applications, we expect that a smaller MSE is better, and a smaller MSE indicates a more stable process quality. If the MSE of two consecutive batches is increased, it indicates that a new change occurs in the production process, which causes the current control mode to be not adapted to the actual production, and therefore, the current control mode needs to be adjusted.
Further, the temperature feedback control model for establishing the hot air temperature and the steam valve opening degree comprises the following steps:
the temperature feedback control model divides the actual value of the hot air temperature into N intervals by taking the target value of the hot air temperature as the center, determines the steam valve openings corresponding to different intervals, and controls the steam valve openings to reach corresponding values according to the interval where the actual value of the hot air temperature is located so as to realize the control of the hot air temperature.
In one embodiment, the hot air temperature is divided into eleven zones with the target value as the center. If the temperature of the hot air is more than 64, the opening degree of the valve is adjusted to 70; if the temperature of the hot air is between 62 and 64, the opening degree of the valve is adjusted to 65; if the temperature of the hot air is between 61 and 62, the opening degree of the valve is adjusted to be 62; if the temperature of the hot air is between 60.5 and 61 and the current value of the hot air is greater than the value of the hot air at the last moment, adjusting the opening degree of the valve to be 61; if the temperature of the hot air is between 60.5 and 61 and the current value of the hot air is less than the value of the hot air at the previous moment, the opening degree of the valve is adjusted to be 60; if the temperature of the hot air is between 60 +/-0.5, the opening degree of the valve is adjusted to be 60; if the temperature of the hot air is between 59 and 59.5 and the current value of the hot air is greater than the hot air value at the last moment, adjusting the opening degree of the valve to be 60; if the temperature of the hot air is between 59 and 59.5 and the current value of the hot air is smaller than the hot air value at the last moment, adjusting the opening degree of the valve to be 59; if the temperature of the hot air is between 58 and 59, the opening degree of the valve is adjusted to 58; if the temperature of the hot air is between 56 and 58, the opening degree of the valve is adjusted to 57; if the temperature of the hot air is less than 56 ℃, the opening degree of the valve is adjusted to 55.
Further, the temperature feedback control model for establishing the hot air temperature and the steam valve opening further comprises:
and acquiring a measured value of the hot air temperature, and calculating to obtain a temperature difference value according to the target value of the hot air temperature.
And establishing a temperature PID feedback control model, and adjusting the opening of a steam valve according to the temperature difference value so as to control the temperature of hot air.
Specifically, a value obtained by subtracting the hot air temperature target value and the hot air temperature actual measurement value is used as a temperature difference value, the temperature difference value is used as an input of a temperature PID feedback control model, the temperature PID feedback control model outputs an opening degree adjusting value, the opening degree of a steam valve is adjusted, and the hot air temperature is changed to reduce the temperature difference value until the hot air temperature target is reached.
The invention provides a quality control method based on airflow type cut stem drying, which is characterized in that the opening of a steam valve and the injection quantity of a feed liquid are respectively adjusted by setting a PID (proportion integration differentiation) feedback control model for controlling the inlet and outlet moisture contents of a temperature feedback control module so as to control the hot air temperature and the outlet moisture content, so that the problem of non-uniformity in controlling the moisture content change of outlet cut stems in the conventional cut stem drying process is solved, the batch consistency of the cut stem drying outlet moisture content can be improved, and the quality control capability in the production process is improved.
Correspondingly, the invention also provides a quality control system based on airflow type cut stem drying, which comprises: the first acquisition unit is used for acquiring a hot air temperature target value and an outlet moisture content target value in the cut stem drying process. And the temperature control unit is used for establishing a temperature feedback control model of the hot air temperature and the opening of the steam valve, and controlling the opening of the steam valve according to the temperature feedback control model and the target value of the hot air temperature so as to control the hot air temperature in the dryer. And the second acquisition unit is used for acquiring the measured value of the outlet moisture content of the cut stem drying process and acquiring a target deviation value of the outlet moisture content according to the target value and the measured value. And the moisture content control unit is used for establishing a moisture content PID feedback control model and is used for adjusting the hot air speed according to the target deviation value so as to perform feedback control on the moisture content of the outlet, so that the moisture content of the outlet of the cut stem drying process outlet material in the batch is controlled according to the target value.
The system further comprises: and the fitting unit is used for acquiring the outlet water content and the hot air speed in the cut stem drying process within the set time in real time, and fitting according to the time relationship to obtain a regression fitting function of the outlet water content and the hot air speed. And the first PID parameter adjusting unit is used for determining the value range of the PID parameters according to the regression fitting function, so that the moisture content PID feedback control model can carry out PID parameter adjustment according to the value range in the cut stem drying process in the same batch.
The system further comprises: and the error calculation unit is used for acquiring the value sample of the water content of the outlet of each batch and calculating the mean square error of the batch after each batch is finished. And the second PID parameter adjusting unit is used for adjusting the PID parameters in the water content PID feedback control model when the mean square errors of two continuous batches are continuously increased.
The temperature control unit includes: and the temperature partition control module is used for dividing the actual value of the hot air temperature into N intervals by taking the target value of the hot air temperature as a center, determining the opening of the steam valve corresponding to different intervals, and controlling the opening of the steam valve to reach a corresponding value according to the interval where the actual value of the hot air temperature is located so as to realize the control of the hot air temperature.
The temperature control unit further includes: the temperature PID control module is used for acquiring a hot air temperature measured value and calculating a temperature difference value according to the hot air temperature target value; and establishing a temperature PID feedback control model, and adjusting the opening of a steam valve according to the temperature difference value so as to control the temperature of hot air.
Therefore, the quality control system based on airflow type cut stem drying provided by the invention has the advantages that the opening of the steam valve and the injection amount of the feed liquid are respectively adjusted by setting the PID feedback control model for controlling the inlet and outlet moisture content of the temperature feedback control so as to control the hot air temperature and the outlet moisture content, the problem of non-uniformity in controlling the moisture content change of the outlet cut stem in the conventional cut stem drying process is solved, the batch consistency of the cut stem drying outlet moisture content can be improved, and the quality control capability in the production process is improved.
The construction, features and functions of the present invention have been described in detail with reference to the embodiments shown in the drawings, but the present invention is not limited to the embodiments shown in the drawings, and all equivalent embodiments modified or modified by the spirit and scope of the present invention should be protected without departing from the spirit of the present invention.
Claims (10)
1. A quality control method based on airflow type cut stem drying is characterized by comprising the following steps:
acquiring a hot air temperature target value and an outlet water content target value in a cut stem drying procedure;
establishing a temperature feedback control model of the hot air temperature and the opening of a steam valve, and controlling the opening of the steam valve according to the temperature feedback control model and the target value of the hot air temperature so as to control the temperature of the hot air in the dryer;
acquiring a measured value of the outlet moisture content of the cut stem drying process, and acquiring a target deviation value of the outlet moisture content according to the target value and the measured value;
and establishing a moisture content PID feedback control model for adjusting the hot air speed according to the target deviation value so as to perform feedback control on the moisture content of the outlet, so that the moisture content of the outlet of the cut stem drying process outlet material in the batch is controlled according to the target value.
2. The pneumatic cut rolled stem drying-based quality control method according to claim 1, further comprising:
acquiring outlet water content and hot air speed in a cut stem drying procedure within set time in real time, and fitting according to a time relation to obtain a regression fitting function of the outlet water content and the hot air speed;
and determining the value range of the PID parameters according to the regression fitting function, so that the water content PID feedback control model performs PID parameter adjustment according to the value range in the cut stem drying process in the same batch.
3. The pneumatic cut rolled stem drying-based quality control method according to claim 2, further comprising:
collecting a value sample of the water content of the outlet of each batch, and calculating the mean square error of each batch after each batch is finished;
and if the mean square errors of two continuous batches are continuously increased, adjusting the PID parameters in the water content PID feedback control model.
4. The pneumatic cut rolled stem drying-based quality control method according to claim 3, further comprising:
the temperature feedback control model for establishing the hot air temperature and the steam valve opening comprises the following steps:
the temperature feedback control model divides the actual value of the hot air temperature into N intervals by taking the target value of the hot air temperature as the center, determines the steam valve openings corresponding to different intervals, and controls the steam valve openings to reach corresponding values according to the interval where the actual value of the hot air temperature is located so as to realize the control of the hot air temperature.
5. The pneumatic cut rolled stem drying-based quality control method according to claim 4, further comprising:
the temperature feedback control model for establishing the hot air temperature and the steam valve opening further comprises:
acquiring a measured value of the hot air temperature, and calculating to obtain a temperature difference value according to the target value of the hot air temperature;
and establishing a temperature PID feedback control model, and adjusting the opening of a steam valve according to the temperature difference value so as to control the temperature of hot air.
6. A quality control system based on airflow type cut stem drying is characterized by comprising:
the first acquisition unit is used for acquiring a hot air temperature target value and an outlet moisture content target value in a cut stem drying procedure;
the temperature control unit is used for establishing a temperature feedback control model of the temperature of the hot air and the opening of the steam valve, and controlling the opening of the steam valve according to the temperature feedback control model and the target value of the temperature of the hot air so as to control the temperature of the hot air in the dryer;
the second acquisition unit is used for acquiring an actual measurement value of the outlet moisture content of the cut stem drying process and acquiring a target deviation value of the outlet moisture content according to the target value and the actual measurement value;
and the moisture content control unit is used for establishing a moisture content PID feedback control model and is used for adjusting the hot air speed according to the target deviation value so as to perform feedback control on the moisture content of the outlet, so that the moisture content of the outlet of the cut stem drying process outlet material in the batch is controlled according to the target value.
7. The pneumatic cut rolled stem drying-based quality control method according to claim 6, further comprising:
the fitting unit is used for acquiring the outlet water content and the hot air speed in the cut stem drying process within set time in real time, and fitting according to the time relationship to obtain a regression fitting function of the outlet water content and the hot air speed;
and the first PID parameter adjusting unit is used for determining the value range of the PID parameters according to the regression fitting function, so that the moisture content PID feedback control model can carry out PID parameter adjustment according to the value range in the cut stem drying process in the same batch.
8. The pneumatic cut rolled stem drying-based quality control method according to claim 7, further comprising:
the error calculation unit is used for acquiring the value sample of the water content of the outlet of each batch and calculating the mean square error of each batch after each batch is finished;
and the second PID parameter adjusting unit is used for adjusting the PID parameters in the water content PID feedback control model when the mean square errors of two continuous batches are continuously increased.
9. The pneumatic cut rolled stem drying-based quality control method according to claim 8, wherein the temperature control unit comprises:
and the temperature partition control module is used for dividing the actual value of the hot air temperature into N intervals by taking the target value of the hot air temperature as a center, determining the opening of the steam valve corresponding to different intervals, and controlling the opening of the steam valve to reach a corresponding value according to the interval where the actual value of the hot air temperature is located so as to realize the control of the hot air temperature.
10. The pneumatic cut rolled stem drying-based quality control method according to claim 9, wherein the temperature control unit further comprises:
the temperature PID control module is used for acquiring a hot air temperature measured value and calculating a temperature difference value according to the hot air temperature target value;
and establishing a temperature PID feedback control model, and adjusting the opening of a steam valve according to the temperature difference value so as to control the temperature of hot air.
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| CN115997960A (en) * | 2022-11-30 | 2023-04-25 | 上海烟草集团有限责任公司 | Method, device and system for controlling outlet moisture of cut stem drying machine |
| CN116282820A (en) * | 2023-02-01 | 2023-06-23 | 江门绿润环保科技有限公司 | Accurate air control method for sludge low-temperature desiccator |
| CN117243912A (en) * | 2023-10-09 | 2023-12-19 | 翔鹏(北京)生物科技有限公司 | Preparation method and application of composition for increasing human coenzyme I |
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