Devolatilization and ignition of coal particles in a two-dimensional fluidized bed
In a two-dimensional (15 X 200 X 400 mm) high-temperature fluidized bed, devolatilization ignition and combustion phenomena of single coal particles have been studied. The particles, with diameters of 4-9 mm, were selected from three coal types of widely different rank: brown coal, bituminous coal, and anthracite. The bed consisted in most cases of porous alumina particles (0.6 mm diameter), and was fluidized by O/sub 2//N/sub 2/ gas mixtures. At constant bed temperatures ranging from 200 to 850/sup 0/C, the various stages prior to the eventual combustion of the residual char particle were recorded on videotape. This paper gives an account of visual observations on the release, ignition, and combustion of volatiles as well as on the ignition of char. Results of measurements of the temperature and delay time of both volatiles and char ignition are also reported. Finally, the period over which flames of volatiles are visible in the bed has been measured for each coal particle; at sufficiently high bed temperature they are indicative for the total devolatilization time.
- Research Organization:
- Mechanical and Chemical Engineering Dept., Univ. of Twente, Enschede (NL); Masinski Fakultet, Beograd (YU)
- OSTI ID:
- 6206021
- Journal Information:
- Combust. Flame; (United States), Journal Name: Combust. Flame; (United States) Vol. 75:1; ISSN CBFMA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
014000* -- Coal
Lignite
& Peat-- Combustion
ALUMINIUM
ANTHRACITE
BITUMINOUS COAL
BLACK COAL
BROWN COAL
CARBONACEOUS MATERIALS
CHARS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COAL
COMBUSTION
COMBUSTION KINETICS
DATA
DEVOLATILIZATION
DISPERSIONS
ELEMENTS
ENERGY SOURCES
EXPERIMENTAL DATA
FLAMES
FLUIDIZED-BED COMBUSTION
FOSSIL FUELS
FUELS
HIGH TEMPERATURE
IGNITION
IMAGES
INFORMATION
KINETICS
MAGNETIC STORAGE DEVICES
MAGNETIC TAPES
MATERIALS
MEMORY DEVICES
METALS
MIXTURES
NITROGEN
NONMETALS
NUMERICAL DATA
OXIDATION
OXYGEN
PARTICLE SIZE
PYROLYSIS PRODUCTS
REACTION KINETICS
SIZE
THERMOCHEMICAL PROCESSES
TWO-DIMENSIONAL CALCULATIONS
VIDEO TAPES