Research Papers: Gas Turbines: Cycle Innovations

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

[+] Author and Article Information
Klas Jonshagen

Department of Energy Sciences, Faculty of Engineering, Lund University, P.O. Box 118, SE-221 00 Lund Swedenklas.jonshagen@energy.lth.se

Nikolett Sipöcz

Department of Mechanical and Structural Engineering and Material Science, University of Stavanger, Kitty Kiellands hus, Rennebergstien 30, 4021 Stavanger, Norwaynikolett.sipocz@uis.no

Magnus Genrup

Department of Energy Sciences, Faculty of Engineering, Lund University, P.O. Box 118, SE-221 00 Lund Swedenmagnus.genrup@energy.lth.se

J. Eng. Gas Turbines Power 133(1), 011703 (Sep 17, 2010) (7 pages) doi:10.1115/1.4001988 History: Received April 12, 2010; Revised April 22, 2010; Published September 17, 2010; Online September 17, 2010

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.

Copyright © 2011 by American Society of Mechanical Engineers
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Figure 1

Schematic figure of the reference plant (CO2 compression not included)

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Figure 2

Temperature to heat flux diagram of the reference case with the economizer highlighted

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Figure 3

Temperature to heat flux diagram of the plant after removing the low-pressure superheater, adding condensate driven fuel preheating and a new deaeration set-up

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Figure 4

Temperature to heat flux diagram of the CCPP plant with CO2 capture when the excess energy from the second economizer is utilized for regenerating the amine

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Figure 5

Temperature to heat flux diagram of the CCPP plant with CO2 capture, one pressure level has been omitted to enlarge the economizer and thereby, the energy available for amine regenerating



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