Optimal Combined Cycle For Co2 Capture With EGR
Author
Summary, in English
Most state-of-the-art natural gas fired combined cycle (NGCC) plants are triple-pressure reheat cycles with efficiencies close to 60 percent. However, with carbon capture and storage, the efficiency will be penalized by almost 10 percent units. To limit the energy consumption for a carbon capture NGCC plant, exhaust gas recirculation (EGR) is necessary. Utilizing EGR increases the CO2 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 to the design case. This study looks into how the turbo machinery 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 CO2 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.
Department/s
Publishing year
2010
Language
English
Pages
867-875
Publication/Series
Proceedings Of The ASME Turbo Expo 2010, Volume 3: Controls, Diagnostics and Instrumentation; Cycle Innovations; Marine
Volume
3
Document type
Conference paper
Publisher
American Society Of Mechanical Engineers (ASME)
Topic
- Energy Engineering
Conference name
ASME Turbo Expo 2010
Conference date
2010-06-14 - 2010-06-18
Status
Published
ISBN/ISSN/Other
- ISBN: 978-0-7918-4398-7