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Title: Simulation of heat integrated multiple effect evaporator system
Authors: Jyoti G.
Khanam, Shabina
Published in: International Journal of Thermal Sciences
Abstract: In the present work a number of configurations and difficulties of MEE system such as condensate flashing, vapor bleeding, steam splitting, preheating of liquor using condensate, variable physical properties and boiling point rise are taken into consideration to analyze the evaporation system. For this purpose seven effect evaporator system of a typical Indian pulp and paper industry is considered. The model developed is a set of nonlinear algebraic equations that include total and solute mass balances, energy balances, heat transfer rate equations, and the composition and temperature dependence of thermodynamic properties such as vapor pressures and enthalpies. The model is solved using nonlinear equation solver. Economic evaluation to optimize the number of flash tanks is carried out for seven effect evaporator system. The two different types of configurations of vapor bleeding are considered and compared. Considering optimum number of flash tanks and best configuration of vapor bleeding, a system is designed. Further, a modified system is found considering optimum number of flash tanks and preheating of liquor using condensate. This modified design enhances the steam economy by 23.77% and reduces the steam consumption by 36.76% in comparison to base case and thus, it is selected as optimum design. Finally, Pinch analysis of the MEE network has also been carried out and it is found that predicted results are compared well with base case. © 2013 Elsevier Masson SAS. All rights reserved.
Citation: International Journal of Thermal Sciences (2014), 76(): 110-117
Issue Date: 2014
Keywords: Condensate flashing
Multiple effect evaporators
Pinch analysis
Vapor bleeding
ISSN: 12900729
Author Scopus IDs: 55877720500
Author Affiliations: Jyoti, G., Dept. of Chemical Engineering, National Institute of Technology, Rourkela 769008, Orissa, India
Khanam, S., Dept. of Chemical Engineering, Indian Institute of Technology, Roorkee 247667, Uttarakhand, India
Corresponding Author: Khanam, S.; Dept. of Chemical Engineering, Indian Institute of Technology, Roorkee 247667, Uttarakhand, India; email:
Appears in Collections:Journal Publications [CH]

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