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

摘要

Thermomechanical pulp is an important process for producing fibrous mass used
in papermaking. A two-level control strategy that stabilizes and optimizes the
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 and
coordinate the two layers for enhanced constraint handling.