Advanced coordinated control system for moisture in cut tobacco dryer

Abstract

The invention provides an advanced coordinated control system for moisture in a cut tobacco dryer. The system is characterized by comprising a head control system, a middle control system and a tail step control system, wherein the head control system adopts a multi-input single-output model; in the middle control system, the moisture is introduced into the control system and subjected to feedback correction, and during model predictive control, an error between the process actual output and the model output is adopted for feedback to overcome a defect; and the tail step control system establishes a model for the tail process. The advanced coordinated control system has the advantages that: 1, the control process is fully automatic; 2, the capacity of overcoming interference is high, and the control accuracy is high; 3, the system has an adaptive control function; 4, the dried cut tobacco amount at the head and tail is reduced to the greatest degree; 5, the oscillation in the regulating process is avoided; 6, the fragmentation of the cut tobacco in the production process is reduced; 7, jump and non-smoothness caused by piecewise fitting are avoided; and 8, a condition that the relative humidity in a cut tobacco drying cylinder is influenced due to ultrahigh or ultralow moisture exhaust is avoided.

Description

technical field [0001] The invention relates to a brand-new advanced moisture coordination control system of a shred drying machine applied to the shred drying section of a cigarette factory, which is used to control the moisture content of shredded tobacco after the shredded shred drying stage, and belongs to the field of advanced process control. Background technique [0002] The moisture content of cut tobacco at the outlet of the drying cylinder is an important quality control index in the process of silk making. At present, the moisture control at the outlet of the drying cylinder at home and abroad (such as Germany Huani, Kunchuan and Qinhuangdao Tobacco Machine Factory) adopts simple mathematical models combined with traditional methods. PID algorithm for control. Since there are many interference factors affecting the water separation at the cut tobacco outlet during the drying process (such as: feed cut tobacco moisture, feed cut tobacco flow rate, steam pressure, h...

AI Technical Summary

Problems solved by technology

The moisture process itself has its own particularity. It is not an ordinary first-order or second-order process. It is a new type of combined integral process with complex dynamic characteristics.

The process of adjusting the temperature of the cylinder wall to control the moisture is relatively slow, while the process of adjusting the moisture discharge to control the moisture is relatively fast. The dynamic relationship between the two is relatively complicated, and there is a coupling phenomenon. It is difficult for the conventional PID control algorithm to effectively balance the two , often resulting in oscillations or too weak regulation, requiring manual intervention

It is precisely because the drying process has the above characteristics that it is difficult to achieve satisfactory control quality by using conventional control methods.

Images