Evaluation of cooling requirements of post-combustion CO2 capture applied to coal-fired power plants

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Title: Evaluation of cooling requirements of post-combustion CO2 capture applied to coal-fired power plants
Authors: Brandl, P
Soltani, SM
Fennell, PS
Mac Dowell, N
Item Type: Journal Article
Abstract: Whilst CO2 capture and storage (CCS) technology is widely regarded as being an important tool in mitigating anthropogenic climate change, care must be taken that its extensive deployment does not substantially increase the water requirements of electricity generation. In this work, we present an evaluation of the cooling demand of an amine-based post-combustion CO2 capture process integrated with a coal-fired power plant. It is found that the addition of a capture unit translates into an increase in the total cooling duty of ≈47% (subcritical), ≈33% (supercritical) and ≈31% (ultra-supercritical) compared to a power plant without capture. However, as the temperature at which this cooling is required varies appreciably throughout the integrated power capture process, it is found that his increase in cooling duty (MW) does not necessarily lead to an increase in cooling water usage (kg/MW). Via a heat integration approach, we demonstrate how astute cascading of cooling water can enable a reduction of cooling water requirements of a decarbonised power plant relative to an unmitigated facility. This is in contrast to previous suggestions that the addition of CCS would double the water footprint.
Issue Date: 10-Apr-2017
Date of Acceptance: 2-Apr-2017
URI: http://hdl.handle.net/10044/1/49501
DOI: https://dx.doi.org/10.1016/j.cherd.2017.04.001
ISSN: 1744-3598
Publisher: Institution of Chemical Engineers
Start Page: 1
End Page: 10
Journal / Book Title: Chemical Engineering Research and Design
Volume: 122
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 http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: Engineering & Physical Science Research Council (E
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (E
Funder's Grant Number: ERI 023708/EP/K000446/1
EP/M001369/1
EP/K000446/1
Keywords: Science & Technology
Technology
Engineering, Chemical
Engineering
Water-energy nexus
Carbon capture and sequestration
Carbon capture readiness (CCR)
CARBON CAPTURE
WATER-USE
CCS
ENERGY
INTEGRATION
DIOXIDE
SYSTEM
NEXUS
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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