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Steady state simulation and exergy analysis of supercritical coal-fired power plant with CO₂ capture

Olaleye, Akeem K.; Wang, Meihong; Kelsall, Greg

Authors

Akeem K. Olaleye

Meihong Wang

Greg Kelsall



Abstract

Integrating a power plant with CO₂ capture incurs serious efficiency and energy penalty due to use of energy for solvent regeneration in the capture process. Reducing the exergy destruction and losses associated with the power plant systems can improve the rational efficiency of the system and thereby reducing energy penalties. This paper presents steady state simulation and exergy analysis of supercritical coal-fired power plant (SCPP) integrated with post-combustion CO₂ capture (PCC). The simulation was validated by comparing the results with a greenfield design case study based on a 550 MWe SCPP unit. The analyses show that the once-through boiler exhibits the highest exergy destruction but also has a limited influence on fuel-saving potentials of the system. The turbine subsystems show lower exergy destruction compared to the boiler subsystem but more significance in fuel-saving potentials of the system. Four cases of the integrated SCPP-CO2 capture configuration was considered for reducing thermodynamic irreversibilities in the system by reducing the driving forces responsible for the CO₂ capture process: conventional process, absorber intercooling (AIC), split-flow (SF), and a combination of absorber intercooling and split-flow (AIC + SF). The AIC + SF configuration shows the most significant reduction in exergy destruction when compared to the SCPP system with conventional CO₂ capture. This study shows that improvement in turbine performance design and the driving forces responsible for CO₂ capture (without compromising cost) can help improve the rational efficiency of the integrated system.

Citation

Olaleye, A. K., Wang, M., & Kelsall, G. (2015). Steady state simulation and exergy analysis of supercritical coal-fired power plant with CO₂ capture. Fuel, 151, 57-72. https://doi.org/10.1016/j.fuel.2015.01.013

Acceptance Date Jan 6, 2015
Online Publication Date Jan 28, 2015
Publication Date Jul 1, 2015
Deposit Date Mar 7, 2016
Publicly Available Date Mar 7, 2016
Journal Fuel
Print ISSN 0016-2361
Electronic ISSN 1873-7153
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 151
Pages 57-72
DOI https://doi.org/10.1016/j.fuel.2015.01.013
Keywords Post-combustion carbon capture; Supercritical coal-fired power plants; Conventional exergy analysis; Advanced exergy analysis; Steady state process simulation
Public URL https://hull-repository.worktribe.com/output/412412
Publisher URL http://www.sciencedirect.com/science/article/pii/S0016236115000186
Copyright Statement © 2015, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Additional Information Author's accepted manuscript of article published in: Fuel, 2015, v.151 : The 10th European Conference on Coal Research and its Applications

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