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Method for modeling and controlling tobacco moisture regaining water adding flow based on historical production data

A technology of adding water flow and production data, which is applied in the field of controlling tobacco moisture and water flow based on historical production data modeling.

Active Publication Date: 2021-10-12
QINHUANGDAO TOBACCO MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reasons are as follows: first, it did not take into account the large difference in the moisture absorption capacity of different materials, and the atomized water may not be able to absorb; Taking into account the impact of hot air, moisture removal, and climate change on the moisture content of materials

Method used

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  • Method for modeling and controlling tobacco moisture regaining water adding flow based on historical production data
  • Method for modeling and controlling tobacco moisture regaining water adding flow based on historical production data
  • Method for modeling and controlling tobacco moisture regaining water adding flow based on historical production data

Examples

Experimental program
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Effect test

Embodiment 1

[0105] A method based on historical production data modeling to control the water flow rate of tobacco rehydration. When the tobacco rehydration process is at the head stage, the actual water flow rate q of tobacco rehydration is controlled at the head stage _head The following formula 2 is used:

[0106] q _head =q 1_head =q 1 ×k 3

[0107] In the above formula, q _head is the actual flow rate of water added in the stage of tobacco moisture regain at the head stage, q 1_head Tobacco rehydration and water flow rate calculated for the feed-forward stage of the material head stage, k 3 is the coefficient of variation of the material head.

[0108] In this embodiment, the coefficient of variation k of material head 3 The initial value of k 3_ini , k 3_ini The general value range is 0.8~1.2, k 3 The cutoff value for is 1.0. k 3 The changing law of is to keep the initial value first, then gradually change, and finally keep the termination value, because the performance...

Embodiment 2

[0112] This embodiment is based on the first embodiment, when the tobacco moisture regain process is in the transition process stage, the transition process stage controls the actual water flow q of tobacco moisture regain _tran The following formula 3 is used:

[0113] q _tran =q 1_tran +q 2 =q 1 +q 2

[0114] In the above formula, q _tran is the actual flow rate of water added to the tobacco moisture in the transition process stage, q 1_tran Tobacco remoisturization and water flow rate obtained by feed-forward calculation for the transition process phase.

[0115] In this embodiment, according to the outlet moisture setting value u 2sp and the actual outlet moisture u 2 The deviation of the PID closed-loop feedback operation is performed to obtain the feedback adjustment offset q 2 , with q 1_tran +q 2 As the actual water flow q _tran To control the tobacco remoisture process.

[0116] In this embodiment, the coefficient of variation k of material head 3 After...

Embodiment 3

[0119] In this embodiment, on the basis of Embodiment 2, within the time t1, the rehydrated material is output through the discharge vibration tank 5, and the actual outlet moisture u can be detected by the outlet moisture meter 6. 2 , the actual outlet moisture u 2 Close to the outlet moisture set value u 2spAnd the outlet moisture setting value u 2sp and the actual outlet moisture u 2 The deviation is less than 0.35%, indicating that due to the difference in actual production conditions, the flow rate q of tobacco moisture plus water obtained by feed-forward calculation 1_tran Too high, it is necessary to start the feedback adjustment offset q in advance 2 , to eliminate modeling errors.

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Abstract

The invention discloses a method for modeling and controlling tobacco moisture regaining water adding flow based on historical production data, and the method comprises the steps: building the relation between the water absorption characteristics of different brands of materials, the incoming material moisture, the material flow, the outlet moisture set value and the water adding flow based on the historical production data; and the control system intelligently finds the optimal water adding flow according to the current production working condition, so that the dependence on feedback adjustment is reduced, and the time for the actual outlet water to reach the outlet water set value and keep stable is shortened. During specific implementation, the moisture regaining process is divided into three stages, namely a stub bar stage, a transition process stage and a steady-state production stage, corresponding formulas are adopted for controlling the water adding flow in different stages, feedback adjustment of outlet moisture is introduced in time, and modeling errors are eliminated. According to the method, the effective production data of the current batch are counted, the standard water adding flow is reversely deduced, and variable weight iterative operation is performed on the online modeling result of the previous batch of materials and the historical value of the same brand, so that online self-learning of the model is realized to adapt to gradual change of seasons and environmental temperature and humidity.

Description

technical field [0001] The invention relates to the field of tobacco preparation, in particular to a method for modeling and controlling tobacco remoisture plus water flow rate based on historical production data. Background technique [0002] In the tobacco shred production line, moisture regain control is widely used. The equipment such as leaf moisture regain cylinder, leaf shred moisture regain cylinder, leaf feeder with water adding function, and cut stem feeder must realize the moisture regain treatment of materials. The moisture content of the rehydrated material needs to be precisely controlled, and its moisture stability is crucial to the subsequent drying process. [0003] Usually, to control the moisture content of the tobacco material after moisture regain, the moisture content of the incoming material before the moisture regain is generally measured separately 1 and the actual outlet moisture u after rewetting 2 , taking into account the offset of the increas...

Claims

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Application Information

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IPC IPC(8): A24B3/04B67D7/08
CPCA24B3/04B67D7/08
Inventor 王小飞杨洪艺张世成韩百恒王树香张羽
Owner QINHUANGDAO TOBACCO MACHINERY
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