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Carbon capture with low energy penalty: Supplementary fired natural gas combined cycles
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes.
2012 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 97, 164-169 p.Article in journal (Refereed) Published
Abstract [en]

Enhancing CO2 concentration in exhaust gas has been considered as a potentially effective method to reduce the penalty of electrical efficiency caused by CO2 chemical absorption in post-combustion carbon capture systems. Supplementary firing is an option that inherently has an increased CO2 concentration in the exhaust gas, albeit a relatively low electrical efficiency due to its increased mass flow of exhaust gas to treat and large temperature difference in heat recovery steam generator. This paper focuses on the methods that can improve the electrical efficiency of the supplementary fired combined cycles (SFCs) integrated with MEA-based CO2 capture. Three modifications have been evaluated: (I) integration of exhaust gas reheating, (II) integration of exhaust gas recirculation, and (III) integration of supercritical bottoming cycle. It is further showed that combining all three modifications results in a significant increase in electrical efficiency which is raised from 43.3% to 54.1% based on Lower Heating Value (LHV) of natural gas when compared to the original SFC. Compared with a conventional combined cycle with a subcritical bottoming cycle and without CO2 capture (56.7% of LHV), the efficiency penalty caused by CO2 capture is only 2.6% of LHV.

Place, publisher, year, edition, pages
2012. Vol. 97, 164-169 p.
Keyword [en]
Supplementary fired cycle, Exhaust gas reheating, Exhaust gas recirculation, Supercritical bottoming cycle, CO2 capture, Amine-based chemical absorption
National Category
Energy Engineering
URN: urn:nbn:se:kth:diva-103131DOI: 10.1016/j.apenergy.2011.12.034ISI: 000307196000021ScopusID: 2-s2.0-84862192591OAI: diva2:559305
3rd International Conference on Applied Energy (ICAE), MAY 16-18, 2011, Perugia, Italy

QC 20121008

Available from: 2012-10-08 Created: 2012-10-04 Last updated: 2012-10-08Bibliographically approved

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Yan, Jinyue
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