Thermal-hydraulic Digester Model Using a Higher Order Numerical Method

"Thermal-hydraulic digester model using a higher order numerical method", Unpublished AIChE shall not be responsible for statements or opinions contained in papers or printed in its publications. Abstract This paper presents a detailed fundamental model of a continuous pulp digester developed for simulation and control. Most modeling efforts in the past have either emphasized on reaction kinetics and energy transfer assuming a prescribed flow behavior, or modeled digester hydraulics with simplified reaction kinetics. In this work, we augment the well-known Purdue model by incorporating axial momentum transport, an immediate consequence of which is ability to simulate chip level and its impact on the Kappa number profile. Model performance is illustrated using simulation. The current work also explores and illustrates the use of higher order finite difference methods to reduce numerical dissipation and dispersion.