Characteristics of single-particle coal combustion
The paper discusses the measurement of the burning history of single coal particles, using a two-color optical pyrometer. From intensity traces at two wave-lengths, information on burning times and temperatures, the duration of a volatile flame, and projected areas was obtained for two lignite and three bituminous coals. The coals were pulverized, classified in 38-45 and 90-105 micrometer size ranges, and burned at furnace temperatures of 1250 and 1700 K in atmospheres containing from 15 to 100% oxygen. The intensity traces at short times showed the influence of either attenuation by volatiles or, in some cases, an intense peak attributed to luminous radiation by soot. A model was developed to simulate the combustion of a coal particle. Model predictions of the duration of volatile flames agreed with the values inferred from the intensity traces. Burning times predicted by the model agreed partially with measured values. At 1700 K, the bituminous coal burned close to the predicted diffusion-limited times, while the lignite coal took longer. At 1250 K, the experimental burnout times for all coals were longer than predicted. Possible reasons for the low predictions may be differences in volatile yields and retardation of the reaction by finely distributed ash particles.
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge, MA (United States). Dept. of Chemical Engineering
- OSTI ID:
- 5928988
- Report Number(s):
- PB-92-121409/XAB; CNN: EPA-R805552-03; EPA-R-808774
- Resource Relation:
- Other Information: Pub. in International Symposium on Combustion/The Combustion Institute (19th), p1123-1130 1982. Sponsored by Environmental Protection Agency, Research Triangle Park, NC. Air and Energy Engineering Research Lab
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BITUMINOUS COAL
COMBUSTION KINETICS
LIGNITE
AIR POLLUTION
AIR POLLUTION CONTROL
ASHES
DEVOLATILIZATION
FLAMES
FUEL-AIR RATIO
MATHEMATICAL MODELS
PARTICLE SIZE
PARTICULATES
PULVERIZED FUELS
PYROMETERS
SOOT
TEMPERATURE MEASUREMENT
TIME DEPENDENCE
BLACK COAL
BROWN COAL
CARBONACEOUS MATERIALS
CHEMICAL REACTION KINETICS
COAL
COMBUSTION PRODUCTS
CONTROL
ENERGY SOURCES
FOSSIL FUELS
FUELS
KINETICS
MATERIALS
MEASURING INSTRUMENTS
PARTICLES
POLLUTION
POLLUTION CONTROL
REACTION KINETICS
RESIDUES
SIZE
014000* - Coal
Lignite
& Peat- Combustion