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Combined cycle power plants with post-combustion CO2 capture : Energy analysis at part load conditions for different HRSG configurations

In English

Författare

  • Maura Vaccarelli
  • Majed Sammak
  • Klas Jonshagen
  • Roberto Carapellucci
  • Magnus Genrup

Summary, in English

The part-load behaviour of combined cycle power plants (CCPP) equipped with post-combustion CO2 capture is analyzed. Different CCPP configurations are compared, including single-, dual- or triple-pressure level steam generators. The gas turbine is a single shaft unit using the variable guide vanes and fuel flow to control the load. The 90% CO2 capture is achieved using monoethanolamine (MEA 30%wt) as absorbent. In all configurations, the reboiler duty to regenerate the absorbent is partly covered by the hot water of the economizer. This economizer-reboiler loop allows to increase the plant efficiency as the possibility to extract more energy from the economizer results in lowering the steam extraction from the turbine. The dual-pressure level CCPP with CO2 capture gives the best efficiency at the design operation. As the load is reduced, the efficiency of the single-pressure plant becomes comparable to the efficiency of the dual-pressure plant, due to the effective thermal integration between the heat recovery steam generator and the absorbent regeneration process. Hence, when CCPPs with CO2 capture operate at part-loads, a further benefit can be achieved with the single-pressure level plant, having it both design simplicity and low efficiency penalties for the CO2 capture.

Avdelning/ar

Publiceringsår

2016-10-01

Språk

Engelska

Sidor

917-925

Publikation/Tidskrift/Serie

Energy

Volym

112

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Energy Engineering

Nyckelord

  • Combined cycle
  • Off design
  • Part-load operation
  • Post-combustion CO capture

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0360-5442