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Received January 31, 2002
Accepted March 16, 2002
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The Effect of Particle Shape on the Pressure Drop across the Dust Cake
Dept. Chem. Eng./ERI, Gyeongsang National University, Chinju 660-701, Korea 1Korea Institute of Energy Research, Daejeon 305-343, Korea
jhchoi@nongae.gsnu.ac.kr
Korean Journal of Chemical Engineering, July 2002, 19(4), 711-717(7), 10.1007/BF02699322
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Abstract
In order to observe the effect of particle shape of poly-dispersed dusts on filter performance, the pressure drop across the dust cakes of fly ashes from a conventional power plant (PC), fluidized bed combustion (FBC), and paint incinerator (FI) was measured over a metal filter element in the accurate conditions. A fluidized bed column was used to prepare the dust feed stream of uniform particle distribution. The fine particles of FI ash have a tendency to be agglomerated at low transport velocity. The aggregates were broken at high velocity of more than 21 cm/sec. FBC_x000D_
ash composed of jagged type particles and containing high concentration of unburned-carbon showed higher pressure drop than that of PC ash composed mostly of spherical particles. FI ash composed of aggregates of very fine carbon particles presented the highest pressure drop among the fly ashes tested. The shape factors of PC, FBC, and FI ash were estimated as 0.91, 0.76, and 0.65, respectively, by the Ergun equation. The results implied that the irregular particle tends to form a higher pressure drop and to be more compressible than spherical one.
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