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On the timing of primary fragmentation during bituminous coal particle devolatilisation in a fluidized bed combustor
Author(s) -
Stubington John F.,
Moss Brendan
Publication year - 1995
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450730410
Subject(s) - fragmentation (computing) , coal , bituminous coal , materials science , combustor , fluidized bed combustion , environmental science , combustion , waste management , chemistry , organic chemistry , computer science , operating system , engineering
The times at which devolatilising coal particles fragmented were compared with their devolatilisation times in a fluidized bed combustor. Whereas the devolatilisation times were similar, the time to first fragmentation varied markedly from coal to coal. Immediate fragmentation was attributed to thermal shock. Fragmentation during the first 1/3 of the devolatilisation time was attributed to the internal pressure generated from restricted transport of volatiles through the pores in the coal structure. Fragmentation near the end of devolatilisation may occur due to weakening of the coal structure by loss of volatiles. Primary fragmentation did not affect the devolatilisation time, even for coals which fragmented early in their devolatilisation time.