Corrosion and erosion in PFBC environments. Final report

Technical Report · Sun Jul 01 04:00:00 EDT 1984

OSTI ID:6806390

McCarron, R L

This report summarizes work on the EPRI RP 979-14 Program, PFB Materials Parameter Tests. Two nominally 200-hour tests were conducted in the General Electric Company's Pressurized Fluidized Bed (PFB) Coal Combustion Facility located 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: (1) 1710 to 1770/sup 0/F bed temperature and Pfizer dolomite (0.1 wt % sodium plus potassium); and (2) 1630 to 1690/sup 0/F 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 to 1600/sup 0/F. 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, while a CoNiCrAlY cladding experienced hot corrosion attack at all temperatures. A platinum-aluminide diffusion coating showed excellent corosion resistance at all temperatures. 8 references, 31 figures, 15 tables.

• Research Organization: General Electric Co., Schenectady, NY (USA)
• OSTI ID: 6806390
• Report Number(s): EPRI-CS-3363; ON: TI84920444
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
ALKALI METALS
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
ALUMINIUM ALLOYS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CARBONATE MINERALS
CARBONATES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CHLORINE
COAL
COATINGS
COBALT ALLOYS
COBALT BASE ALLOYS
COMBUSTION
CORROSION
CORROSION RESISTANCE
DATA
DOLOMITE
ELEMENTS
ENERGY SOURCES
EROSION
EXPERIMENTAL DATA
FLUIDIZED BED
FLUIDIZED-BED COMBUSTION
FOSSIL FUELS
FUELS
GAS TURBINES
HALOGENS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MACHINERY
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MATERIALS
MATERIALS TESTING
METALS
MINERALS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NONMETALS
NUMERICAL DATA
OXIDATION
OXYGEN COMPOUNDS
PROTECTIVE COATINGS
SULFUR CONTENT
TEMPERATURE DEPENDENCE
TEST FACILITIES
TESTING
THERMOCHEMICAL PROCESSES
TURBINES
TURBOMACHINERY
VERY HIGH TEMPERATURE