Char fragmentation and fly ash formation during pulverized-coal combustion

Journal Article · Sat Aug 01 00:00:00 EDT 1992 · Combustion and Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(92)90118-9· OSTI ID:7232788

Baxter, L L ^[1]

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1. Sandia National Labs., Livermore, CA (United States). Combustion Research Facility

This paper reports that experimental measurements of char and fly ash size distributions are reported in the size range from approximately 0.5 to 100 {mu}m for three coals, ranging in rank from high-volatile bituminous coal to lignite. These measurements are coupled wit a theoretical model of fly ash formation to determine the extend of char fragmentation as a function of initial char particle size. These data reveal several mechanistic aspects of fragmentation. The extent of fragmentation is strongly dependent or size and coal rank. Bituminous coals may form over 100 fragments per char particle at large initial char particle sizes (about 80 {mu}m) and less than 10 at small initial char particle size (less than 20 {mu}m). Lignites fragment less extensively, with the number of fragments per original char particle being less than 5 at all particle sizes. These results partially resolve some apparent discrepancies in published studies of fragmentation.

• OSTI ID: 7232788
• Journal Information: Combustion and Flame; (United States), Vol. 90:2; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
BITUMINOUS COAL
FLUIDIZED-BED COMBUSTION
CHARS
FRAGMENTATION
PARTICLE SIZE
FLY ASH
COAL RANK
COMBUSTION PRODUCTS
EXPERIMENTAL DATA
LIGNITE
PULVERIZED FUELS
AEROSOL WASTES
ASHES
BLACK COAL
BROWN COAL
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
COMBUSTION
DATA
ENERGY SOURCES
FOSSIL FUELS
FUELS
INFORMATION
MATERIALS
NUMERICAL DATA
OXIDATION
PYROLYSIS PRODUCTS
RESIDUES
SIZE
THERMOCHEMICAL PROCESSES
WASTES
014000* - Coal
Lignite
& Peat- Combustion
010600 - Coal
Lignite
& Peat- Properties & Composition
010404 - Coal
Lignite
& Peat- Gasification
010800 - Coal
Lignite
& Peat- Waste Management