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

Vaccarelli, Maura ; Sammak, Majed LU ; Jonshagen, Klas LU ; Carapellucci, Roberto and Genrup, Magnus LU (2016) In Energy 112. p.917-925
Abstract

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... (More)

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.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Combined cycle, Off design, Part-load operation, Post-combustion CO capture
in
Energy
volume
112
pages
9 pages
publisher
Elsevier
external identifiers
  • scopus:84977666011
  • wos:000385318700080
ISSN
0360-5442
DOI
10.1016/j.energy.2016.06.115
language
English
LU publication?
yes
id
ec19a607-ce0f-45a9-90a3-742fbfa9801d
date added to LUP
2016-10-17 11:04:54
date last changed
2025-01-12 13:22:39
@article{ec19a607-ce0f-45a9-90a3-742fbfa9801d,
  abstract     = {{<p>The part-load behaviour of combined cycle power plants (CCPP) equipped with post-combustion CO<sub>2</sub> 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% CO<sub>2</sub> 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 CO<sub>2</sub> 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 CO<sub>2</sub> 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 CO<sub>2</sub> capture.</p>}},
  author       = {{Vaccarelli, Maura and Sammak, Majed and Jonshagen, Klas and Carapellucci, Roberto and Genrup, Magnus}},
  issn         = {{0360-5442}},
  keywords     = {{Combined cycle; Off design; Part-load operation; Post-combustion CO capture}},
  language     = {{eng}},
  month        = {{10}},
  pages        = {{917--925}},
  publisher    = {{Elsevier}},
  series       = {{Energy}},
  title        = {{Combined cycle power plants with post-combustion CO<sub>2</sub> capture : Energy analysis at part load conditions for different HRSG configurations}},
  url          = {{http://dx.doi.org/10.1016/j.energy.2016.06.115}},
  doi          = {{10.1016/j.energy.2016.06.115}},
  volume       = {{112}},
  year         = {{2016}},
}