Introduction of closed cycle gas turbines with their capability of retaining combustion generated CO2 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 90’s 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 CO2 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 is presented, which works with a cycle fluid of high steam content. 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 turbo-machinery 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 CO2 mitigation costs in the range of 10 $/ton CO2 captured, making this zero emission power plant a promising technology in the case of a future CO2 tax.
Thermodynamic and Economic Investigation of an Improved Graz Cycle Power Plant for CO2 Capture
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Sanz, W, Jericha, H, Moser, M, & Heitmeir, F. "Thermodynamic and Economic Investigation of an Improved Graz Cycle Power Plant for CO2 Capture." Proceedings of the ASME Turbo Expo 2004: Power for Land, Sea, and Air. Volume 7: Turbo Expo 2004. Vienna, Austria. June 14–17, 2004. pp. 409-418. ASME. https://doi.org/10.1115/GT2004-53722
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