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The erosion/corrosion of small superalloy turbine rotors operating in the effluent of a PFB coal combustorThe operation of a turbine in the effluent of a pressurized fluidized bed (PFB) coal combustor presents serious materials problems. Synergistic erosion/corrosion and deposition/corrosion interactions may favor the growth of erosion-resistant oxides on blade surfaces, but brittle cracking of these oxides may be an important source of damage along heavy particle paths. Integrally cast alloy 713LC and IN792 + Hf superalloy turbine rotors in a single-stage turbine with 6% partial admittance have been operated in the effluent of a PFB coal combustor for up to 164 hr. The rotor erosion pattern exhibits heavy particle separation with severe erosion at the leading edge, pressure side center, and suction side trailing edge at the tip. The erosion distribution pattern gives a spectrum of erosion/oxidation/deposition as a function of blade position. The data suggest that preferential degradation paths may exist even under the targeted lower loadings (less than 20 ppm).
Document ID
19800025873
Document Type
Conference Paper
Authors
Zellars, G. R. (NASA Lewis Research Center Cleveland, OH, United States)
Benford, S. M. (NASA Lewis Research Center Cleveland, OH, United States)
Rowe, A. P. (NASA Lewis Research Center Cleveland, OH, United States)
Lowell, C. E. (NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 10, 2013
Publication Date
July 1, 1979
Subject Category
METALLIC MATERIALS
Meeting Information
Conference on Advanced Materials for Alternate Fuel Capable Directly Fired Heat Engines(Castine, ME)
Distribution Limits
Public
Copyright
Other