SYSTEM AND METHOD FOR CONTROLLING A THERMO-MECHANICAL WOOD PULP REFINER

摘要

Thermomechanical pulp is an important process for producing fibrous mass use d in papermaking. A two-level control strategy that stabilizes and optimizes t he refining process has been developed. The Stabilization layer consists of a multivariable model predicative range controller that regulates the refiner line operations. The Quality Optimization layer provides the pulp quality control as measured by an online pulp quality (freeness fibre length) sensor . This control strategy leverages the natural decoupling in the process. The modular design technique is able to handle multiple refiner lines that empty into a common latency chest. A global optimizer is also used to integrate an d coordinate the two layers for enhanced constraint handling.