Most state-of-the-art natural gas-fired combined cycle (NGCC) plants are triple-pressure reheat cycles with efficiencies close to 60%. However, with carbon capture and storage, the efficiency will be penalized by almost 10% units. To limit the energy consumption for a carbon capture NGCC plant, exhaust gas recirculation (EGR) is necessary. Utilizing EGR increases the content in the gas turbine exhaust while it reduces the flue gas flow to be treated in the capture plant. Nevertheless, due to EGR, the gas turbine will experience a different media with different properties compared with the design case. This study looks into how the turbomachinery reacts to EGR. The work also discusses the potential of further improvements by utilizing pressurized water rather than extraction steam as the heat source for the stripper. The results show that the required low-pressure level should be elevated to a point close to the intermediate-pressure to achieve optimum efficiency, hence, one pressure level can be omitted. The main tool used for this study is an in-house off-design model based on fully dimensionless groups programmed in the commercially available heat and mass balance program IPSEPRO. The model is based on a GE 109FB machine with a triple-pressure reheat steam cycle.
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e-mail: klas.jonshagen@energy.lth.se
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January 2011
Research Papers
A Novel Approach of Retrofitting a Combined Cycle With Post Combustion Capture
Klas Jonshagen,
Klas Jonshagen
Department of Energy Sciences, Faculty of Engineering,
e-mail: klas.jonshagen@energy.lth.se
Lund University
, P.O. Box 118, SE-221 00 Lund Sweden
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Nikolett Sipöcz,
Nikolett Sipöcz
Department of Mechanical and Structural Engineering and Material Science,
e-mail: nikolett.sipocz@uis.no
University of Stavanger
, Kitty Kiellands hus, Rennebergstien 30, 4021 Stavanger, Norway
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Magnus Genrup
Magnus Genrup
Department of Energy Sciences, Faculty of Engineering,
e-mail: magnus.genrup@energy.lth.se
Lund University
, P.O. Box 118, SE-221 00 Lund Sweden
Search for other works by this author on:
Klas Jonshagen
Department of Energy Sciences, Faculty of Engineering,
Lund University
, P.O. Box 118, SE-221 00 Lund Swedene-mail: klas.jonshagen@energy.lth.se
Nikolett Sipöcz
Department of Mechanical and Structural Engineering and Material Science,
University of Stavanger
, Kitty Kiellands hus, Rennebergstien 30, 4021 Stavanger, Norwaye-mail: nikolett.sipocz@uis.no
Magnus Genrup
Department of Energy Sciences, Faculty of Engineering,
Lund University
, P.O. Box 118, SE-221 00 Lund Swedene-mail: magnus.genrup@energy.lth.se
J. Eng. Gas Turbines Power. Jan 2011, 133(1): 011703 (7 pages)
Published Online: September 17, 2010
Article history
Received:
April 12, 2010
Revised:
April 22, 2010
Online:
September 17, 2010
Published:
September 17, 2010
Citation
Jonshagen, K., Sipöcz, N., and Genrup, M. (September 17, 2010). "A Novel Approach of Retrofitting a Combined Cycle With Post Combustion Capture." ASME. J. Eng. Gas Turbines Power. January 2011; 133(1): 011703. https://doi.org/10.1115/1.4001988
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