Stratified composition of inorganic submicron particles produced during coal combustion

Conference · Fri Jan 01 00:00:00 EST 1982 · Symp. (Int.) Combust., (Proc.); (United States)

OSTI ID:5636164

Neville, M; Sarofim, A F

The submicron particles produced by the combustion of a Montana lignite in twenty percent oxygen at furnace temperature of 1700 K were characterized. The particles are found to consist of a core of magnesium and iron oxides with an inner coating of silica and an outer coating of sodium, arsenic, and other trace metals. The silicon and trace species show an increase in concentration with decreasing particle size in the submicron range (less than or equal to 400 angstroms). The experimental results can be explained by a model in which MgO nucleates homogeneously in the boundary layer of a burning coal particle and coalesces to a primary particle size of 160 angstroms. Silicon deposition subsequently occurs as a probable consequence of the low rate of oxidation of the SiO vapors released by the burning coal particle. Volatile trace species condense on the outer surface when the combustion products are quenched.

• Research Organization: Massachusetts Inst. of Tech., Cambridge
• OSTI ID: 5636164
• Report Number(s): CONF-820801-
• Journal Information: Symp. (Int.) Combust., (Proc.); (United States), Conference: 19. international symposium on combustion, Haifa, Israel, 8 Aug 1982
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
LIGNITE
COMBUSTION
IRON OXIDES
MAGNESIUM OXIDES
PARTICLE SIZE
PARTICULATES
SILICA
ALKALINE EARTH METAL COMPOUNDS
BROWN COAL
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
ENERGY SOURCES
FOSSIL FUELS
FUELS
IRON COMPOUNDS
MAGNESIUM COMPOUNDS
MATERIALS
MINERALS
OXIDATION
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PARTICLES
SILICON COMPOUNDS
SILICON OXIDES
SIZE
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
014000* - Coal
Lignite
& Peat- Combustion