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http://hdl.handle.net/2080/889
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. |
URI: | http://hdl.handle.net/2080/889 |
ISSN: | 0098-1354 |
Appears in Collections: | Journal Articles |
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