TECHNICAL PAPERS: Gas Turbines: Cycle Innovations

Design Optimization of the Graz Cycle Prototype Plant

[+] Author and Article Information
Herbert Jericha, Emil Göttlich, Wolfgang Sanz, Franz Heitmeir

Institute for Thermal Turbomachinery and Machine Dynamics, Graz University of Technology, Inffeldgasse 25, A-8010 Graz, Austria

J. Eng. Gas Turbines Power 126(4), 733-740 (Nov 24, 2004) (8 pages) doi:10.1115/1.1762910 History: Received October 01, 2002; Revised March 01, 2003; Online November 24, 2004
Copyright © 2004 by ASME
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Jericha, H., and Göttlich, E., 2002, “Conceptual Design for an Industrial Prototype Graz Cycle Power Plant,” ASME Paper 2002-GT-30118.
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Principle flow scheme of Graz cycle power plant
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Schematic arrangement of turbomachine shafts
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Comparison of O2 burner design solutions (a) H2+O2, (b) CH4+O2, (c) oxygen blown fuel gas+O2
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Combustion chamber, O2 burner and annular flame cage cross section at entry to HTT
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High speed shaft, HTT and HPT driving C3 and power gear to el. generator Nr. 2
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(a) Standard gas turbine rotor speed optimization at given volume flow and enthalpy head; (b) HTT shaft built in two overhung disks (single and double) with optimal speed selected for compressor and gear drive
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HTT first-stage velocity triangles and blade profiles over blade height, for tip, mean and root section in curved annular blade channel
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HTT first-stage transonic expansion in nozzle profile near blade root and tail shocks of nozzle trailing edges reaching into blade profile inlet creating a high-frequency shock passing flow situation there
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HTT first-stage blade design drawing, steam cooling ICS slits and supply hole arrangement
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HTT first-stage steam cooling flow; pressure distribution radial, through nozzle cooling holes inward, through tangential acceleration nozzles into wheel space and radially outwards in ICS supply holes is shown, transonic pressure ratio for ICS slits is secured
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HTT cooling flow in both rotors and intermediate shaft vibration damper
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General optimized arrangement of turbomachines for a 92 MW prototype unit
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Detailed thermodynamic cycle data of 92 MW Graz cycle plant, 12



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