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Title: Simulation of Flat Falling Film Evaporator System for Concentration of Black Liquor
Authors: Bhargava, R
Khanam, S
Mohanty, B
Ray, A K
Keywords: Nonlinear model
Flat falling film evaporator
Empirical correlations
Boiling point rise
Overall heat transfer coefficient
Heat Loss
Issue Date: 2008
Publisher: Elsevier
Citation: Elsevier,Computers & chemical engineering, 2008, vol. 32, no12, pp. 3213-3223
Abstract: In the present investigation, a nonlinear mathematical model is developed for the analysis of Septuple effect flat falling film evaporator (SEFFFE) system used for concentrating weak black liquor in a nearby paper mill. This model is capable of simulating process of evaporation considering variations in boiling point rise (), overall heat transfer coefficient (U), heat loss from evaporator (Qloss), flow sequences, liquor/steam splitting, feed, product and condensate flashing, vapor bleeding and physico-thermal properties of the liquor. Based on mass and energy balance around an effect a cubic polynomial is developed, which is solved repeatedly in a predetermined sequence using generalized cascade algorithm. For development of empirical correlations for , U of flat falling film evaporators and Qloss, plant data have been collected from SEFFFE system. These correlations compute , U and Qloss within average absolute errors of 2.4%, 10% and 33%, respectively, when their results are compared with the plant data.
ISSN: 0098-1354
Appears in Collections:Journal Articles

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