A Comparative Analysis of Two Competing Mid-size Oxy-fuel Combustion Cycles
Paper in proceedings, 2012

Conceptual turbine and compressor designs have been established for the semi-closed oxy-fuel combustion combined cycle and the Graz cycle. Real gas effects are addressed by extending cycle and conceptual design tools with a fluid thermodynamic and transport property database. Maximum compressor efficiencies are established by determining optimal values for stage loading, degree of reaction and number of compressor stages. Turbine designs are established based on estimates on achievable blade root stress levels and state of the art design parameters. The work indicates that a twin shaft geared compressor is needed to keep stage numbers to a feasible level. The Graz cycle is expected to be able to deliver around 3% net efficiency benefit over the semi-closed oxy-fuel combustion combined cycle at the expense of a more complex realization of the cycle.

Semi-closed Oxy-fuel Combustion Combined Cycle

turbomachinery design

oxy-fuel combustion

carbon capture and storage

Graz cycle

combined cycles


Egill Maron Thorbergsson

Chalmers, Applied Mechanics, Fluid Dynamics

Tomas Grönstedt

Chalmers, Applied Mechanics, Fluid Dynamics

Majed Sammak

Lund University

Magnus Genrup

Lund University

Proceedings of ASME Turbo Expo 2012: Power for Land, Sea and Air. June 11-15, 2012, Copenhagen, Denmark


Subject Categories

Energy Engineering

Fluid Mechanics and Acoustics

Areas of Advance






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