Optimal control system for chemimechanical pulp technology

Abstract

The invention relates to an optimal control scheme and system for the chemimechanical pulp technology, and belongs to the technical field of pulping and papermaking industrial process control. The optimal control system is characterized by being composed of a routine control system, an optimal control unit, an on-line measurement instrument, an actuator and a chemimechanical pulp technology process controlled object. The controlled object forms a complex system with a plurality of key process variables as representation. In the chemimechanical pulp production technological process, the key process variables related to energy consumption, pollution and paper pulp performance in the technology process are used in the system as control variables, controlled variables and noise variables to be brought into a multivariable model for predictive control. An optimization model is built with production cost as a target, disturbance among the multiple key process variables is solved by the system, production is stabilized, the automatic degree is improved, operation under the condition that constraint conditions are almost achieved is implemented, energy saving and emission reduction are achieved, cost is reduced, paper pulp products even in output performance are produced, the overall paper pulp performance is improved, and automatic production control is achieved according to needed indexes.

Description

Technical field: [0001] The invention relates to the technical field of process control of chemical mechanical pulp production process in papermaking industry. Specifically, it is a process control system for optimizing the chemical mechanical pulp production process. Background technique [0002] In the paper industry, the pulping process is the process of separating lignin and a small amount of other useless components in the plant fiber raw materials to obtain a mixed liquid pulp mainly composed of fibers and water. The pulp mixed with liquid can also be dried into powder or pulp board for storage or sale. [0003] With the evolution of several processes (such as mechanical pulp, thermomechanical pulp, semi-chemical pulp, etc.) centered on disc-refined pulp, the chemical-mechanical pulp process has gradually become the most modern and important in the field of pulping. One of the technology. This is due to the pressure of resources, environment, and benefits in the...

AI Technical Summary

Problems solved by technology

[0009] In view of the problems mentioned in the background technology and the current development needs of the paper industry, the present invention aims to solve the control problem that multiple single-loop controllers cannot solve the multi-variable mutual interference in the complex system process, and make the chemical mechanical pulp process production obtain optimization

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