09268 Nickel Base Material Options for Fabrication of Advanced Coal Fired Boiler Components

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Product Number: 51300-09268-SG

ISBN: 09268 2009 CP

Author: Brian A. Baker, Paul Hazeldine and Gaylord D. Smith

Publication Date: 2009

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Current and future goals set for efficient energy production by coal-fired boilers require a stable of austenitic materials which are capable of meeting numerous stringent demands. Advanced ultrasupercritical designs, possibly coming to fruition in the next few years, target very high steam temperatures, 700°C and higher, and steam pressures as high as 350 bar. Conditions in supercritical boilers coming online currently are becoming increasingly arduous as well, requiring increased utilization of austenitic materials having improved creep strength and corrosion resistance. Materials to be utilized in steam superheaters and reheaters will need a combination of exceptional strength, and corrosion resistance to combat coal ash corrosion. Resistance to steam oxidation at high temperatures will be important for steam header pipe internals and superheater and reheater internals as well. Waterwall panels will continue to require overlaying with corrosion resistant materials to resist an ever more demanding environment. Nickel-based alloy options for future facilities and associated corrosion issues will be discussed.

Keywords: Ultra Supercritical, Coal Ash Corrosion, Nickel-Base Alloys, Stress Rupture, Steam Oxidation