Erosion by char and ash and deposition of ash on carbon steel in the convective section of an industrial boiler

Journal Article · Sat Jan 01 04:00:00 EST 1994 · Corrosion (Houston); (United States)

DOI:https://doi.org/10.5006/1.3293497· OSTI ID:5439411

Walsh, P M; Xie, J; Poe, R L; Miller, B G; Scaroni, A W ^[1]

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1. Pennsylvania State Univ., University Park, PA (United States). Dept. of Materials Science and Engineering

Deposition of ash and erosion of carbon (C) steel by unburned char and ash were measured in the convective section of an industrial boiler while cofiring coal-water fuel and natural gas. Erosion was enhanced by directing a small, high-velocity jet of gas toward a test coupon mounted on an air-cooled tube. The jet entrained surrounding flue gas and suspended particles, accelerating the particles toward the specimen surface. After exposure for 2 h, changes in the surface were evaluated using a surface profiler and an electron microscope. Ash deposition was measured as a function of the jet gas (nitrogen [N[sub 2]], air, and oxygen[O[sub 2]]) and specimen temperature (450 K, 550 K, and 650 K). Erosion of the samples was greatest at the highest temperature and lowest O[sub 2] concentration. Erosion was least severe at low temperature, regardless of O[sub 2] concentration. Erosion also was low at high temperatures in the presence of high O[sub 2] concentrations. Ash deposition was greatest at the highest temperatures and highest O[sub 2] concentrations. The oxidized surfaces may have been more resistant to erosion than the metal substrate. However, the correlation between high ash deposition and low erosion suggested changes in the adherence of ash to the surface and resistance of ash deposits to erosion also influenced metal loss.

• DOE Contract Number: FC22-89PC88697
• OSTI ID: 5439411
• Journal Information: Corrosion (Houston); (United States), Journal Name: Corrosion (Houston); (United States) Vol. 50:1; ISSN 0010-9312; ISSN CORRAK
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000 -- Coal
Lignite
& Peat-- Combustion
03 NATURAL GAS
034000 -- Natural Gas-- Combustion
36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ASHES
BOILERS
CARBON STEELS
CARBONACEOUS MATERIALS
CHARS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COAL
COCOMBUSTION
COMBUSTION
COMBUSTION KINETICS
COMBUSTION PRODUCTS
CORROSIVE EFFECTS
DISPERSIONS
ENERGY SOURCES
EROSION
FLUIDS
FOSSIL FUELS
FOULING
FUEL GAS
FUEL SLURRIES
FUELS
GAS FUELS
GASES
HYDROGEN COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
KINETICS
MATERIALS
MIXTURES
NATURAL GAS
OXIDATION
OXYGEN COMPOUNDS
PYROLYSIS PRODUCTS
REACTION KINETICS
RESIDUES
SLURRIES
STEELS
SUSPENSIONS
THERMOCHEMICAL PROCESSES
WATER