Introduction of closed-cycle gas turbines with their capability of retaining combustion generated can offer a valuable contribution to the Kyoto goal and to future power generation. Therefore, research and development at Graz University of Technology since the 1990s has lead to the Graz Cycle, a zero emission power cycle of highest efficiency. It burns fossil fuels with pure oxygen, which enables the cost-effective separation of the combustion by condensation. The efforts for the oxygen supply in an air separation plant are partly compensated by cycle efficiencies far higher than 60%. In this work a further development, the S-Graz Cycle, which works with a cycle fluid of high steam content, is presented. Thermodynamic investigations show efficiencies up to 70% and a net efficiency of 60%, including the oxygen supply. For a 100 MW prototype plant the layout of the main turbomachinery is performed to show the feasibility of all components. Finally, an economic analysis of a S-Graz Cycle power plant is performed showing very low mitigation costs in the range of $10/ton captured, making this zero emission power plant a promising technology in the case of a future tax.
Thermodynamic and Economic Investigation of an Improved Graz Cycle Power Plant for CO2 Capture
Contributed by the International Gas Turbine Institute (IGTI) of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Paper presented at the International Gas Turbine and Aeroengine Congress and Exhibition, Vienna, Austria, June 13–17, 2004, Paper No. 2004-GT-53722. Manuscript received by IGTI, October 1, 2003; final revision, March 1, 2004. IGTI Review Chair: A. J. Strazisar.
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Sanz, W., Jericha , H., Moser , M., and Heitmeir, F. (September 20, 2005). "Thermodynamic and Economic Investigation of an Improved Graz Cycle Power Plant for CO2 Capture ." ASME. J. Eng. Gas Turbines Power. October 2005; 127(4): 765–772. https://doi.org/10.1115/1.1850944
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