Upper wall slag deposits in utility boilers: a progress report on recent work

Conference · Sat Jan 01 04:00:00 EST 1983 · Am. Soc. Mech. Eng., (Pap.); (United States)

OSTI ID:5649063

Austin, L G; Abbott, M F; Kinneman, W P

This paper reviews the major conclusions from a study of slag drop adhesion to boiler steel substrates under conditions comparable to upper wall deposits in utility boiler furnaces. Several different types of test strongly suggest that there is at least one type of bad-acting fly ash particle which initiates slag deposit build-up in the cooler upper regions of a furnace. Fly ash particles formed from coal particles with the correct mixture of pyrite and glass-forming components such as clay and quartz remain fluid and sticky at relatively low temperatures and wet and adhere strongly to the oxide layers on boiler steel. The role of condensed alkali layers in this process has not yet been elucidated. This initiating layer acts as a base for attachment of sticky fly ash spheres.

• Research Organization: Department of Mineral Engineering and Fuel Science Section, The Pennsylvania State University, University Park, PA
• DOE Contract Number: FG22-80PC30199
• OSTI ID: 5649063
• Report Number(s): CONF-830905-
• Conference Information: Journal Name: Am. Soc. Mech. Eng., (Pap.); (United States) Journal Volume: 83-JPGC-PWR-42
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
20 FOSSIL-FUELED POWER PLANTS
200101 -- Fossil-Fueled Power Plants-- Cooling & Heat Transfer Equipment & Systems
ADHESION
AEROSOL WASTES
ALLOYS
ASHES
BOILERS
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
CLAYS
COAL
COMBUSTION
DEPOSITION
ENERGY SOURCES
FLY ASH
FOSSIL FUELS
FOSSIL-FUEL POWER PLANTS
FUELS
IRON ALLOYS
IRON BASE ALLOYS
IRON COMPOUNDS
IRON SULFIDES
MATERIALS
MINERALS
OXIDATION
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
POWER PLANTS
PYRITE
QUARTZ
RESIDUES
SCALING
SILICON COMPOUNDS
SILICON OXIDES
SLAGS
STEELS
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
THERMAL POWER PLANTS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
WASTES