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Fundamental Modeling of Black Liquor Falling Film Evaporators
Authors:
Zdravko I.
Stefanov and Karlene A. Hoo
Department of Chemical Engineering, Texas Tech University, Lubbock, TX
Abstract
Fundamental modeling of evaporators found in the pulp and paper
industry is a very challenging task. The physico-chemical phenomena
that occur do not lend themselves readily to known mechanisms and in
many instances data to support these hypotheses are difficult to
obtain. In this work, a distributed parameter model (a system of
partial differential equations - PDEs) based on first-principles
knowledge about fluid dynamics and heat transfer processes is
developed for one type of an evaporator, that of a falling film
lamella type black liquor evaporator. Primarily, the model describes
falling film evaporation on one lamella. The model is solved using
orthogonal collocation on finite elements when there are disturbances
in the mass feed rate and feed dry solids content and wall temperature;
and in the presence of scaling.
Publication: Download the Introduction PDF format.
Corresponding Author: Karlene A. Hoo
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