MATERIALS ISSUES FOR TURBINES FOR OPERATION IN …

MATERIALS ISSUES FOR TURBINES FOR OPERATION IN ULTRA-SUPERCRITICAL Wrighta, Maziasza, Ellisb, Gibbonsc, and WoodforddABSTRACTCoal-fired supercritical-steam power plants are currently operating with steam temperatures at the inlet tothe high-pressure turbine close to or slightly above 600 C. The use of recently-developed martensitic-ferritic steels is expected to allow this temperature to be raised to 620 C, which probably represents theinherent limit of capability of these advanced steels. Further increases in temperature capability willrequire the use of Ni-base alloys, and efforts in this direction have been pioneered in Europe where thereare plans to build a plant operating on steam at 700 C. In the , there is a significant effort aimed atqualifying alloys that could be used for tubing and piping to deliver steam at 720/760 C. In this paper,the technical and business considerations involved in determining and prioritizing the MATERIALS needs forturbines operating under these ultra-supercritical steam conditions are is widely recognized that, because of the very large role that coal plays in power generation, efforts toreduce overall CO2 emissions will, of necessity, involve efforts to find cleaner ways in which to use carbon from coal before or after combustion introduces costs that seriously detract from thecompetitiveness of that power generation process.

MATERIALS ISSUES FOR TURBINES FOR OPERATION IN ULTRA-SUPERCRITICAL STEAM I.G. Wrighta, P.J. Maziasza, F.V. Ellisb, T.B. Gibbonsc, and D.A. Woodfordd ABSTRACT Coal-fired supercritical-steam power plants are currently operating with steam temperatures at the inlet to

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