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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
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
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
2016-10-17 11:04:54
@misc{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},
  keyword      = {Combined cycle,Off design,Part-load operation,Post-combustion CO capture},
  language     = {eng},
  month        = {10},
  pages        = {917--925},
  publisher    = {ARRAY(0xb798d88)},
  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},
  volume       = {112},
  year         = {2016},
}