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Carbon capture with low energy penalty: Supplementary fired natural gas combined cycles
Mälardalen University, School of Sustainable Development of Society and Technology. (MERO)ORCID iD: 0000-0002-6279-4446
SINTEF Energy Res,Trondheim, Norway.
Mälardalen University, School of Sustainable Development of Society and Technology. (MERO)ORCID iD: 0000-0003-0300-0762
2012 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 97, no SI, 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, no SI, 164-169 p.
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-16531DOI: 10.1016/j.apenergy.2011.12.034ISI: 000307196000021Scopus ID: 2-s2.0-84862192591OAI: oai:DiVA.org:mdh-16531DiVA: diva2:575933
Available from: 2012-12-11 Created: 2012-12-11 Last updated: 2014-01-07Bibliographically approved

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CiteExportLink to record
Permanent link

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Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
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  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
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Output format
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