Abstract
Char aggregates and bed particles covered by carbon deposits are formed as the result of injection of Fuel—Water Slurries (FWS) into hot fluidized beds. Fragmentation and attrition behaviour of these carbonaceous solids has been investigated using two bench-scale fluidized bed units, both 40 mm ID. The first is equipped with a basket for retrieval of fragments, the second with a two-exit head for measurement of time-resolved carbon elutriation rates. Fragmentation and attrition rates have been determined under combustion and inert conditions. They have been correlated with the external surface of carbon particles present in the bed when the size of carbonaceous solids was larger than the bed solids, or with the mass of carbon present in the bed when bed solids were also the test material. Rate equation constants have been estimated and compared with those previously obtained for various coal chars and cokes by means of the same experimental apparatus and technique.
Published Version
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