Evaluation of cooling requirements of post-combustion 2 ...
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Evaluation of cooling requirements of post-combustion
CO2 capture applied to coal-fired power plantsPatrick Brandl1,2, Salman Masoudi Soltani2, Paul S. Fennell2, Niall Mac Dowell1,3*
1Centre for Environmental Policy, Imperial College London, South Kensington Campus, London SW7 1NA, UK 2Department of Chemical Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK
3Centre for Process Systems Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK
*E-mail address: [email protected] *Tel: +44 (0)20 7594 9298
References[1] Department of Energy and Climate Change, Energy Trends: June 2016: URN 16D/79B.[2] M. E. Boot-Handford et al., Carbon capture and storage update, Energy Environ. Sci.7 (1) (2014) 130-189.[3] International Energy Agency. World Energy Outlook, 2012.
AcknowledgementsThe authors gratefully acknowledge the financial support from the EPSRC under grants EP/M001369/1(MESMERISE-CCS), EP/M015351/1 (ONF) and EP/N024567/1 (CCSInSupply). Additional support from the UKCCS Research Centre under EPSRC grant number EP/K000446/1 is also gratefully acknowledged.
Carbon Capture in the UK: Factsheet
The UK has been
committed to reduce the CO2
emissions by 80% from 1990 levels by 2050.
Electricity generation from fossil fuels is one
of the biggest single emission sources of CO2
(25% of total) [1].
Capturing CO2
from the power plants’ flue gas
emitted otherwise into the
atmosphere can significantly reduce CO2
emissions.
In conjunction with other
technologies, CCS leads to a
minimised overall costs of electricity supply in the long
run [2].
Water-Energy Nexus
Water usage at fossil fuel
power stations is
considerably high [3].
An additional CCS plant could result in a significant increase in
the associated cooling requirements leading to an surge in
the localised water usage.
Objectives
Evaluating the cooling demand
of an amine-based post-
combustion CO2
capture process integrated with
a coal-fired power plant.
Presenting a breakdown of the required cooling
duty by taking into account the plant’s
capacity, steam cycle and operating conditions and
classifying the potential of cascading cooling
water .
A Coal-fired Power Plant Model with Post-Combustion CO2 Capture
Effect of steam cycle (SC) on cooling water flow rate for a coal-fired power plant (a) without CCS, (b) with CCS and (c) with CCS plus an integrated cooling cascade
Relative share of various cooling duties
ConclusionsThe results are in contrast to previous suggestions that the
addition of CCS would double the water footprint.
The temperature at which cooling is required varies appreciably
throughout the integrated capture process plant.
The increase in cooling duty (MW) does not necessarily lead to an increase in
cooling water usage (kgH2O/MW).
Integration of a cooling water cascade can result in a reduction in the cooling water requirements of a decarbonised
power plant.