Gas turbine blade materials' corrosion in the effluent from a pressurized fluidized bed combustor

Conference · Fri Jun 01 04:00:00 EDT 1984 · Am. Soc. Mech. Eng., (Pap.); (United States)

OSTI ID:6417330

Mc Carron, R L; Brobst, R P

Two nominally 200-hour tests were conducted in the General Electric Company's Pressurized Fluidized Bed (PFB) Coal Combustion facility in Malta, NY. The purpose of the tests was to evaluate the influence of bed operating temperature and dolomite composition on the degradation of gas turbine vane and blade base alloys and protective coating/cladding systems in the effluent from a PFB. Operating conditions were as follows: 1710/sup 0/-1770/sup 0/F (932/sup 0/C-966/sup 0/C) bed temperature and Pfizer dolomite (0.1 wt% sodium plus potassium), and 1630/sup 0/-1690/sup 0/F (888/sup 0/-921/sup 0/C) bed temperature and Tymochtee dolomite (0.9 wt% sodium plus potassium). Brookville seam coal with 4.5 wt% sulfur, 0.3 wt% alkali, and 0.17 wt% chlorine was used in both tests. Bare nickel and cobalt-base vane and blade alloys were susceptible to hot corrosion over the entire temperature range investigated, 1100/sup 0/1600/sup 0/F (593/sup 0/-871/sup 0/C). CoCrAlY and FeCrAlY overlay coatings showed good corrosion resistance at temperatures above 1450/sup 0/F, but were susceptible to pitting attack at lower temperatures. A platinum-aluminide diffusion coating showed excellent corrosion resistance at all temperatures.

• Research Organization: General Electric Company, Advanced Energy Programs Department, Schenectady, New York
• OSTI ID: 6417330
• Report Number(s): CONF-840611-
• Conference Information: Journal Name: Am. Soc. Mech. Eng., (Pap.); (United States) Journal Volume: 84-GT-208
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420500* -- Engineering-- Materials Testing
ALKALI METALS
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATES
CHEMICAL REACTIONS
CHLORINE
COAL-FIRED GAS TURBINES
COATINGS
COMBUSTORS
CORROSION
CORROSION RESISTANCE
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
DOLOMITE
ELEMENTS
FLUIDIZED-BED COMBUSTORS
GAS TURBINES
HALOGENS
HYDROGEN COMPOUNDS
HYDROXIDES
MACHINERY
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MATERIALS TESTING
METALS
MINERALS
NONMETALS
OXYGEN COMPOUNDS
PITTING CORROSION
POTASSIUM
PROTECTIVE COATINGS
SODIUM
TESTING
TURBINE BLADES
TURBINES
TURBOMACHINERY
VANES
VERY HIGH TEMPERATURE