Soot formation and burnout during the combustion of dispersed pulverized coal particles
1988; Elsevier BV; Volume: 21; Issue: 1 Linguagem: Inglês
10.1016/s0082-0784(88)80345-x
ISSN1878-027X
AutoresL.D. Timothy, D. Froelich, Adel F. Sarofim, J.M. Beér,
Tópico(s)Fire dynamics and safety research
ResumoThe formation and burnout of soot during the combustion of three high volatile bituminous coals were studied using a combination of high-speed photography and two-color optical pyrometry. The soot is observed to form in a nearly spherical shell displaced from the particle surface by one to four particle radii. The overall soot cloud diameter is approximately constant with the shell thickness increasing with decreasing oxygen concentration. The soot concentration builds to a peak value and then decays over intervals of 5 ms at 100% O2 to 8 ms at 15% O2. The peak soot concentration ranges from 0.5% of the mass of coal at the higher oxygen concentrations to 3% at the lower. The location and duration of the soot flame are roughly correlated with values calculated from a simple model of the formation and burnout of coal volatiles.
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