Char fragmentation and fly ash formation during pulverized-coal combustion

Journal Article · Sat Aug 01 04:00:00 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), Journal Name: Combustion and Flame; (United States) Vol. 90:2; ISSN 0010-2180; ISSN CBFMA
• Country of Publication: United States
• Language: English

Related Subjects

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