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Optimisation and evaluation of flexible operation strategies for coal- and gas-CCS power stations with a multi-period design approach

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Title: Optimisation and evaluation of flexible operation strategies for coal- and gas-CCS power stations with a multi-period design approach
Authors: Mechleri, E
Fennell, PS
Mac Dowell, N
Item Type: Journal Article
Abstract: Thermal power plants are increasingly required to balance power grids by compensating for the intermittent electricity supply from renewable energy resources. As CO2 capture and storage is integrated with both coal- and gas-fired power plants, it is vital that the emission mitigation technology does not compromise their ability to provide this high-value service. Therefore, developing optimal process operation strategies is vital to maximise both the value provided by and the profitability of these important assets. In this work, we present models of coal- and gas-fired power plants, integrated with a post-combustion CO2 capture process using a 30 wt% monoethanolamine (MEA) solvent. With the aim to decoupling the power and capture plants in order to facilitate profit maximising behaviour, a multi-period dynamic optimisation problem was formulated and solved using these models. Four distinct scenarios were evaluated: load following, solvent storage, exhaust gas by-pass and variable solvent regeneration (VSR). It was found that for both coal- and gas-fired power plants, the VSR strategy is consistently the most profitable option. The performance of the exhaust by-pass scenario is a strong function of the carbon prices and is only selected at very low carbon prices. The viability of the solvent storage strategy was found to be a strong function of the capital cost associated with the solvent storage infrastructure. When the cost of the solvent tanks has been paid off, then the solvent storage scenario is 3.3% and 8% more profitable than the baseline for the pulverised coal and gas-fired power plants, respectively. Sensitivity analyses showed that, for all strategies, the flexibility benefit declined with reduced carbon and fuel prices, while a “peakier” electricity market, characteristic of one with significant quantities of intermittent renewables deployment, more significantly rewarded flexible operation.
Issue Date: 20-Feb-2017
Date of Acceptance: 28-Sep-2016
URI: http://hdl.handle.net/10044/1/48012
DOI: https://dx.doi.org/10.1016/j.ijggc.2016.09.018
ISSN: 1750-5836
Publisher: ELSEVIER
Start Page: 24
End Page: 39
Journal / Book Title: INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
Volume: 59
Issue: April 2017
Copyright Statement: © 2017 Elsevier Ltd. 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)
Funder's Grant Number: ERI 023708/EP/K000446/1
EP/M001369/1
Keywords: Science & Technology
Technology
GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY
Energy & Fuels
Engineering, Environmental
Science & Technology - Other Topics
Engineering
Flexible CCS
Dynamic optimisation
Dynamic process modelling
Multiperiod design
POSTCOMBUSTION CO2 CAPTURE
VOLATILE ELECTRICITY PRICES
CARBON CAPTURE
PLANTS
STORAGE
SYSTEMS
COST
OPPORTUNITIES
GENERATION
SOLVENTS
Energy
04 Earth Sciences
05 Environmental Sciences
09 Engineering
Publication Status: Published
Appears in Collections:Faculty of Engineering
Centre for Environmental Policy
Chemical Engineering
Faculty of Natural Sciences



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