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

Jonshagen, Klas LU ; Sipocz, Nikolett and Genrup, Magnus LU (2011) In Journal of Engineering for Gas Turbines and Power 133(1).
Abstract
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... (More)
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] (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
keywords
steam power stations, gas turbine, combined cycle power stations, flue gas desulphurisation, power stations
in
Journal of Engineering for Gas Turbines and Power
volume
133
issue
1
publisher
American Society of Mechanical Engineers
external identifiers
  • wos:000282274800012
  • scopus:78649981524
ISSN
1528-8919
DOI
10.1115/1.4001988
language
English
LU publication?
yes
id
2e79d75f-3fcd-473a-a86b-e2f906aed408 (old id 1774278)
date added to LUP
2011-02-01 09:54:15
date last changed
2017-10-01 03:33:40
@article{2e79d75f-3fcd-473a-a86b-e2f906aed408,
  abstract     = {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]},
  author       = {Jonshagen, Klas and Sipocz, Nikolett and Genrup, Magnus},
  issn         = {1528-8919},
  keyword      = {steam power stations,gas turbine,combined cycle power stations,flue gas desulphurisation,power stations},
  language     = {eng},
  number       = {1},
  publisher    = {American Society of Mechanical Engineers},
  series       = {Journal of Engineering for Gas Turbines and Power},
  title        = {A Novel Approach of Retrofitting a Combined Cycle With Post Combustion CO2 Capture},
  url          = {http://dx.doi.org/10.1115/1.4001988},
  volume       = {133},
  year         = {2011},
}