Digital physical model-based loose moisture regaining self-adaptive water control method and system

Abstract

The invention discloses a digital physical model-based loose moisture regaining self-adaptive water control method. The method comprises the following steps: acquiring related data of a smoked sheet in a loose moisture regaining process, wherein the related data at least comprises plate number information, in-mouth water content, out-mouth water content, target out-mouth water content, water addition and smoked sheet quality flow. By judging the in-mouth water content, the out-mouth water content and the smoked sheet quality flow, when the in-mouth water content, the out-mouth water content and the smoked sheet quality flow are in a normal working state, the loose moisture regaining process is controlled and a detailed control process is disclosed. A mathematic model is constructed according to a physical relationship among variables in the loose moisture regaining process, and the data in the loose moisture regaining process is analyzed by using a polynomial regression method, so thattime-variable parameters in the model are identified in real time. The optimum water addition is solved according to the mathematic model and the out-mouth water content of the smoked sheet, and finally, the targets of stabilizing the out-mouth water content of the smoked sheet, improving the percent of pass of the smoked sheets and lowering the cigarette production cost are achieved finally.

Description

technical field [0001] The invention relates to the technical field of loose moisture regain control, in particular to a method and system for loose moisture regain self-adaptive moisture control based on a digital physical model. Background technique [0002] Loose dampening is the first processing procedure that affects the quality of shredded tobacco in the tobacco factory. The moisture content at the exit of loosening dampening is an important process index of this process, and its process stability has a direct impact on the process indicators of subsequent processes. At present, there are many problems in outlet moisture control during the loosening and regaining process, two of which are the most prominent: First, due to the time delay in the loosening and regaining process itself, the loosening and regaining control system cannot adjust the water addition according to the outlet moisture content measured in real time The size, which affects the stability of the outle...

AI Technical Summary

Problems solved by technology

At present, there are many problems in outlet moisture control during the loosening and regaining process, two of which are the most prominent: First, due to the time delay in the loosening and regaining process itself, the loosening and regaining control system cannot adjust the water addition according to the outlet moisture content measured in real time The size, which affects the stability of the outlet moisture content

Second, because the water absorption capacity of the tobacco sheets on the silk production line is always changing, the physical properties of the same batch of tobacco sheets are different, so that the loose moisture regain control system cannot be based on the mathematical model of the loose moisture regain process and the variable values ​​​​obtained by real-time measurements. , the optimal amount of water added at this time is obtained, which affects the stability of the outlet moisture content

[0003] Compared with the importance of the loose moisture regain process and its influence, the moisture control accuracy at the outlet of the tobacco sheet has always been low

For the amount of water added in the loosening and regaining process, it can only be obtained by relying on the constant water addition calculation model set by the on-site PLC control system. However, since the physical characteristics of the tobacco sheet change, after the water addition amount is automatically obtained, manual assistance is required Adjustment, so that the moisture stability at the outlet of the smoke sheet depends on the level of the on-site operator, and the control effect is limited

These current situations reduce the stability of the moisture at the outlet of the tobacco sheets during the loosening and moisture regaining process, resulting in more unqualified shredded tobacco, which has a great impact on the process indicators of subsequent processes

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