𝔖 Bobbio Scriptorium
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96/06381 Modeling the devolatilization of large coal particles


Publisher
Elsevier Science
Year
1996
Weight
213 KB
Volume
37
Category
Article
ISSN
0140-6701

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✦ Synopsis


A set of deposit samples from combustion of coal were characterized with respect to their compositions, phases present, and morphology. These deposits are of primary importance in determining the effect of depositon on heat transfer throuah the water wall. and on the removabilitv of the deposit. For the coal &d combustor sysiem analyzed,, the results'indicate that both K and Fe have significant effects on deposItIon behaviour in the early deposition stage.

96106370

Modallng NO,, ralaaaa from a alngla coal partlcla. II. Formation of NO from char-nltrogan Visona, S. P.


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Analysis of devolatilization of predried large coal particles in fluidized beds requires consideration of both the chemical kinetics of coal decomposition and transport processes. Models available either assume the devolatilization particle to be isothermal (whereas it may be shown that, in general,

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Devolatilization times of large (0.1 and 0.2 g) Utah hvBb and North Dakota lignite coal particles, in the range 15-30s were measured in air at 101 and 507 kPa, at air temperatures of 900 and 1200K in a convective flow reactor. Visual observations indicated infrequent heterogeneous ignition of the li