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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/14787
Title: Modeling, simulation and control of the dynamics of a Heptads’ effect evaporator system used in the Kraft recovery processes
Authors: Verma O.P.
Mohammed T.H.
Mangal S.
Manik, Gaurav
Published in: Transactions of the Institute of Measurement and Control
Abstract: This research article attempts to investigate the dynamic behavior of the heptads’ effect evaporator (HEE) used to concentrate the weak black liquor during the Kraft recovery process in a paper industry. In order to fully characterize the HEE unit, a complete understanding of its performance for steady state and transient conditions is required. For this purpose, a set of first order nonlinear differential equations have been developed for the backward feed flow configuration (BFFC) for an unsteady state. Further, the developed non-linear model is linearized and linear state space equations obtained. The dynamic response of the system in terms of vapor temperature and liquor concentration changes for different changes in input liquor flow rate has been investigated. The rise, delay and settling times for the temperature deviation from steady state have been found to be significantly less as compared with that for the concentration deviation. The results also indicate that each effect of HEE acts as an individual first order system. The placement of such first order systems in series makes both the liquor concentration and vapor temperatures response more sluggish progressively with each subsequent effect. Finally, a Cascade-PID control strategy has been implemented and shown to exhibit differentiated and improved dynamic performance of the HEE system versus open-loop dynamic response. © 2018, © The Author(s) 2018.
Citation: Transactions of the Institute of Measurement and Control (2018), 40(7): 2278-2290
URI: https://doi.org/10.1177/0142331217700239
http://repository.iitr.ac.in/handle/123456789/14787
Issue Date: 2018
Publisher: SAGE Publications Ltd
Keywords: Backward feed flow sequence
Cascade-PID controller
dynamic model
heptads’ effect evaporator
state space
ISSN: 1423312
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
Funding Details: Mr Om Prakash Verma would like to thank Ministry of Human Resource Development, New Delhi, India for providing the Senior Research Fellowship for this work. Also, the authors are thankful to the Director of Star Paper Mill, Saharanpur, India for permissions to visit the paper mill to collect the real-time data. Finally, Mr Om Prakash Verma would like to acknowledge Graphic Era University, Dehradun for providing study leave to pursue a Ph.D. from IIT 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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