Cut lamina drying control method and cut lamina drying system based on feedforward and feedback of HT moisture compensation

Abstract

The invention discloses a cut lamina drying control method and a cut lamina drying system based on feedforward and feedback of HT moisture compensation. By the cut lamina drying control method, steam flow of an HT damping machine is adjusted to compensate HT incoming material moisture fluctuations, cut lamina moisture stability at an inlet of a rolling cylinder is maintained to the utmost extend, influence to a rolling cylinder drying process by the material moisture fluctuations is obviously reduced, dry process parameter stability is maintained, and process processing quality stability is improved; and cut lamina moisture and cut lamina flow at the inlet port of the rolling cylinder are added into a feedback control system through the feedforward, and accuracy of moisture adjustment in the rolling cylinder drying process is improved. The cut lamina drying control system based on the feedforward and feedback of the HT moisture compensation comprises a controller unit, two pneumatic actuators, two moisture meters, an electronic flow scale, a calculator and a cylinder wall steam pressure sensor. The control system is simple in structure, low in cost and easy to promote.

Description

technical field [0001] The invention relates to a method and system for controlling leaf silk drying based on HT water compensation feedforward and feedback. Background technique [0002] Drum drying is a key process that affects the quality of tobacco products in process. This heat-moisture treatment process will have a great impact on the physical, chemical and sensory properties of leaf shreds. The working principle of this process is that after the tobacco leaves with a certain moisture content come out of the leaf storage cabinet and are cut into shreds, according to the flow rate set by the belt scale of the feeder, they are heated and humidified by steam injection in the HT moisture regainer, and then enter the drum shred dryer. ;Drum drying machine provides dry heat source for the shreds through steam-heated cylinder wall and hot air, so that the outlet shreds can reach the moisture suitable for rolling as required by the cigarette process, and at the same time, the ...

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Problems solved by technology

However, for the moisture fluctuation of the incoming shreds, this feed-forward method mainly relies on changing the process parameters such as the steam pressure of the cylinder wall during the drying process to overcome the disturbance. It is not conducive to the stability of the internal quality of the product; at the same time, the feed-forward control is to detect the moisture and flow changes of the incoming shredded silk before the HT dampening machine, and the shredded leaf is also affected by the temperature and humidification conditions of the HT dampening machine before entering the drum. Therefore, the detection signal at this point used in the feedforward control cannot accurately reflect the moisture of the incoming material entering the drum drying equipment, which affects the control accuracy

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