Simultaneous design of separation sequences and whole process energy integration

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Title: Simultaneous design of separation sequences and whole process energy integration
Authors: Leeson, D
Fennell, P
Mac Dowell, N
Shah, N
Item Type: Journal Article
Abstract: This paper presents a novel methodology for the optimisation of the preliminary design of heat-integrated multicomponent distillation sequences. This is achieved through use of a reduced process superstructure where the role of splitting each adjacent key component pair is assigned to an individual separation column, greatly reducing the size and complexity of the problem. This methodology uses information about other process streams on site with which heat can be exchanged within the initial design in order to find a plant-wide optimal separation configuration with the aim of reducing the cost of heating provided by utilities including those used for heating and cooling process streams. In order that this model can be formulated as a mixed-integer linear program, this model utilises a discretised temperature grid where stream temperatures are allowed to vary. This methodology was tested on an example of a mixed alkane feed stream, with the sequence changing dependent on the degree of process integration. The method was found to have the potential for significant cost reductions compared to a heuristic design, with the example exhibiting a cost saving of over 50% and a reduction in CO2 associated with process heating of almost 60%, though the magnitude of these savings is highly dependent on the specific example to which it is applied.
Issue Date: 15-Jul-2017
Date of Acceptance: 6-Jul-2017
ISSN: 0263-8762
Publisher: Institution of Chemical Engineers
Start Page: 166
End Page: 180
Volume: 125
Copyright Statement: © 2017 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Keywords: Science & Technology
Engineering, Chemical
Separation process design
Energy integration
Multicomponent distillation
Preliminary design
0904 Chemical Engineering
Chemical Engineering
Strategic, Defence & Security Studies
Publication Status: Published
Appears in Collections:Centre for Environmental Policy
Chemical Engineering
Faculty of Natural Sciences

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