Thread baking thread process control method

Abstract

The invention relates to a method for controlling the tobacco drying process, which is characterized in that the whole tobacco drying process is divided into a head stage, a middle stage, and a tail stage; the head stage adopts an adaptive learning temperature rising control method, a control system automatically adjusts the temperature in the next temperature rising according to the previous humidity control effect, and the low drum speed is adopted in the heat stage; the middle stage leads water parameters at an outlet into the control system, forecast PID control is adopted to feed back and correct to realize the automatic control for the temperature of the cylinder wall of a tobacco drying cylinder; the tail stage lowers the temperature of the tobacco drying cylinder in advance, closes a steam heater on the cylinder wall and a cyclic hot blast heater in advance, increases the air intake speed, reduces the drawing air speed, and accelerates the drum speed. The tobacco drying process controlling means has the advantages that the influence on the moisture content at the tobacco drying outlet caused by the nonlinearity and the large time delay during the original tobacco drying procedure control process is overcome, the anti-interference ability is strong, various changes of operation conditions can be adapted, and the control of the moisture content at the tobacco drying outlet can be led to achieve higher control precision.

Description

technical field [0001] The invention relates to the relevant technical field of tobacco production, in particular to a method for controlling the shred drying process. Background technique [0002] The production of shredded silk is generally divided into five steps: tobacco pretreatment, feeding, storage, shredded, blended and flavored, and shredded shredded. The shredded drying cylinder is installed obliquely (the angle with the horizontal is about 3-5°), and the shredded drying cylinder is driven by the motor through the transmission device to rotate, so that the shredded tobacco continuously moves down and slides down to the discharge end. When the shredded tobacco flows through the drying cylinder, it directly contacts with the steam heating surface in the cylinder, so that the shredded tobacco is heated up, and the internal moisture is vaporized and dried. Adjusting the steam pressure can change the temperature of the heating surface in the drum; at the same time, the...

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Problems solved by technology

[0004] The object of the present invention is to provide a method for controlling the silk drying process, which solves the problem that the silk drying process is greatly affected by external disturbances, and the control and response present a large hysteresis characteristic. The moisture control accuracy is not high, and a large amount of dry shredded tobacco is produced at the head and tail of the material, which affects the quality of the product

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