This article proposes a method for the modeling and control of a two stage thermo-mechanical pulping process. Experimental data was collected from operational refiners without affecting the pulp production and with no modifications to the facility. The experimental data is used to identify the model parameters. The model predicts refiner motor load, output consistency and the pulp properties of Canadian standard freeness (CSF), shive content and long fibre content as a function of the production rate, the infeed dilution water flow rate and the refiner plate gaps. The model of the plant is used as a guide, whereby the plant operators can predict the future output pulp properties. An adaptive controller is proposed to track changes in the model parameters and to maintain the CSF, the long fiber content and the shive content at a desired level.

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Conference Proceedings of the 1996 Control Systems Conference
Chang, Gary (Gary), Schwartz, H.M, & Phung, Trung (Trung). (1996). Modeling and control of the TMP process. In Control Systems, Preprints, Conference (pp. 117–123).