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Post-combustion CO₂ capture from a natural gas combined cycle power plant using activated carbon adsorption

Lookup NU author(s): Dr Long Jiang, Dr Janie Ling Chin, Professor Tony Roskilly, Dr Andrew SmallboneORCiD

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).

Abstract

As fossil fuel power plants have emitted significant quantity of carbon dioxide (CO₂) into the atmosphere which aggravates climate change, capturing and storing such emissions is key to mitigate the issue. An adsorption system based on a physical adsorbent i.e. activated carbon is first assessed to capture CO₂ emissions from a natural gas combined cycle. Then a subcritical sequential supplementary firing combined cycle with CO₂ capture is used to analyse the effect of CO₂ concentration. Analyses are carried out in terms of power loss and thermal efficiency. To evaluate the advantages of post-combustion CO₂ capture using activated carbon, results are compared with systems using a commercial absorbent, i.e. monoethanolamine and a chemical adsorbent i.e. polyethyleneimine/silica. The net efficiency of natural gas combined cycle using activated carbon increases slightly from 50.8% to 51.1% due to the lower regeneration temperature at 358 K. The performance of the system using PEI/silica is almost the same as that using activated carbon at 368 K. Although the thermal energy required to regenerate the activated carbon is relatively high, a significant improvement of net efficiency is observed with increased partial pressure. Economic analysis indicates that the systems using activated carbon is a competitive alternative for CO₂ capture. It is concluded activated carbon is relatively more advantageous than monoethanolamine in terms of efficiency and cost, which could be further improved with enhanced heat and mass recovery.

Publication metadata

Author(s): Jiang L, Gonzalez-Diaz A, Ling-Chin J, Roskilly AP, Smallbone AJ

Publication type: Article

Publication status: Published

Journal: Applied Energy

Year: 2019

Volume: 245

Pages: 1-15

Print publication date: 01/07/2019

Online publication date: 10/04/2019

Acceptance date: 07/04/2019

Date deposited: 11/04/2019

ISSN (print): 0306-2619

ISSN (electronic): 1872-9118

Publisher: Pergamon Press

URL: https://doi.org/10.1016/j.apenergy.2019.04.006

DOI: 10.1016/j.apenergy.2019.04.006

Data Access Statement: https://doi.org/10.17634/153016-2

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