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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/2477
Title: Mathematical model for a multiple effect evaporator system with condensate-, feed- And product- flash and steam splitting
Authors: Bhargava R.
Khanam, Shabina
Mohanty, Bikash
Ray A.K.
Published in: Indian Journal of Chemical Technology
Abstract: In the present investigation a non-linear mathematical model is developed for the analysis of multiple effect evaporators (MEE) system. This model is capable of simulating process of evaporation and takes into account variations in -boiling point rise (BPR) due to variation in concentration and temperature of liquor, -overall heat transfer coefficient (OHTC) of effects and -physico-thermal property of the liquor. Using mass and energy balance around an effect, a cubic polynomial equation is developed to model an effect, which is solved using generalized cascade algorithm. For this purpose, a Septuple effect flat falling film evaporator (SEFFFE) system with backward feed flow sequence, being used for concentrating weak black liquor and operating in a near by paper mill, is selected as a typical MEE system. This system supports different operating strategies such as steam splitting and condensate-, feed- and product- flashing. The empirical correlations for BPR, OHTCs of flat falling film evaporators and heat loss have been developed using the plant data. Using these correlations, average errors of 3.4%, ± 10% and -33 to +29% have been observed for the predictions of BPR, OHTC and heat loss, respectively.
Citation: Indian Journal of Chemical Technology (2008), 15(2): 118-129
URI: http://repository.iitr.ac.in/handle/123456789/2477
Issue Date: 2008
Keywords: Empirical correlations
Flat falling film evaporator
Heat loss
Mathematical model
Overall heat transfer coefficient
ISSN: 0971457X
Author Scopus IDs: 35856519800
23025264900
57211010484
34768855100
Author Affiliations: Bhargava, R., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee 247 667, India
Khanam, S., Department of Chemical Engineering, National Institute of Technology Rourkela, Rourkela 769 008, India
Mohanty, B., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee 247 667, India
Ray, A.K., Department of Paper Technology, Indian Institute of Technology Roorkee, Roorkee 247 667, India
Corresponding Author: Bhargava, R.; Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee 247 667, India
Appears in Collections:Journal Publications [CH]

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