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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/14783
Title: Minimization of energy consumption in multi-stage evaporator system of Kraft recovery process using Interior-Point Method
Authors: Verma O.P.
Mohammed T.H.
Mangal S.
Manik, Gaurav
Published in: Energy
Abstract: The maximization of the energy (steam) efficiency of a multi-stage evaporator system used for concentrating the black liquor in pulp and paper mills carries immense significance in today's scenario. The nonlinear mathematical models of heptads' effect backward feed flow with various energy saving schemes namely, steam-split, feed-split, feed-preheating and their hybrid operations have been developed. The steam economy as a cost function translates the problem into a nonlinear optimal search problem. The mass and heat balance equations act as nonlinear equality constraints while vapor temperatures and liquor flows appear as inequality constraints. The formulated optimal problem has been solved efficiently using Interior-Point Method which demonstrates advantages of convergence and less sensitivity towards initial values versus conventional algorithms. The simulation results indicate that a hybrid of steam-split, feed-split and feed-preheating process arrangements with backward feed flow could provide the highest heat transfer across evaporator effects with optimum of steam economy of ∼6.49 and consumption of ∼1.97 kg/s. © 2017 Elsevier Ltd
Citation: Energy (2017), 129(): 148-157
URI: https://doi.org/10.1016/j.energy.2017.04.093
http://repository.iitr.ac.in/handle/123456789/14783
Issue Date: 2017
Publisher: Elsevier Ltd
Keywords: Energy optimization
Interior-Point Method
Multi-stage evaporator
Steam consumption
Steam economy
ISSN: 3605442
Author Scopus IDs: 56594677400
57189036944
57213661842
56595314900
Author Affiliations: Verma, O.P., Department of Polymer and Process Engineering, Indian Institute of Technology Roorkee, India
Mohammed, T.H., Department of Polymer and Process Engineering, Indian Institute of Technology Roorkee, India
Mangal, S., Department of Polymer and Process Engineering, Indian Institute of Technology Roorkee, India
Manik, G., Department of Polymer and Process Engineering, Indian Institute of Technology Roorkee, India
Corresponding Author: Manik, G.; Department of Polymer and Process Engineering, Indian Institute of Technology RoorkeeIndia; email: manikfpt@iitr.ac.in
Appears in Collections:Journal Publications [PE]

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