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A Novel Approach of Retrofitting a Combined Cycle With Post Combustion CO2 Capture

In English

Författare

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%. 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 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 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 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. [DOI: 10.1115/1.4001988]

Avdelning/ar

Publiceringsår

2011

Språk

Engelska

Publikation/Tidskrift/Serie

Journal of Engineering for Gas Turbines and Power

Volym

133

Issue

1

Dokumenttyp

Artikel i tidskrift

Förlag

American Society Of Mechanical Engineers (ASME)

Ämne

  • Energy Engineering

Nyckelord

  • steam power stations
  • gas turbine
  • combined cycle power stations
  • flue gas desulphurisation
  • power stations

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1528-8919