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CHARACTERISTICS OF SINGLE PARTICLE COAL COMBUSTION
Citation:
Timothy, L., A. Sarofim, AND J. Beer. CHARACTERISTICS OF SINGLE PARTICLE COAL COMBUSTION. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-91/283 (NTIS PB92121409), 1991.
Description:
The paper discusses the measurement of the burning history of single coal particles, using a two-color optical pyrometer. rom intensity traces at two wavelengths, information on burning times and temperatures, the duration of a volatile flame, and projected areas was obtained for two lignite and three bituminous coals. he 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. he intensity traces at short times showed the influence of either attenuation by volatiles or, in some cases, as intense peak attributed t luminous radiation by soot. odel was developed to simulate the combustion of a coal particle. odel predictions of the duration of volatile flames agreed with values inferred from the intensity traces. urning times predicted by the model agreed partially with measured values. t 1700 K, the bituminous coal burned close to the predicted diffusion-limited times, while the lignite coal took longer. t 1250K, the experimental burnout times for all coals were longer than predicted. ossible reasons for the low predictions may be differences in volatile yields and retardation of the reaction by finely distributed ash particles.
