Radial gas mixing in the upper dilute core of a circulating fluidized bed

摘要: Abstract Based on the assumption of a core-annulus structure, radial gas mixing characteristics were experimentally studied in core upper dilute zone pilot scale circulating fluidized bed (CFB), 0.4 m diameter and 9 height. C0 2 as tracer was injected continuously into center by point source. Radial concentration profiles measured several planes downstream injection point. An analytical solution derived Klinkenberg et al. ( Ind. Eng. Chem., 6 (1953) 1202) [1] for description turbulent single phase flow successfully applied to determine Peclet number, Pe r,c , zone. found be independent superficial velocity u which is agreement with behaviour flow. A mean value =465, also other authors' measurements flow, calculated from at different solids rates G s up 70 kg −2 −1 . The fact that attributed low size particles, too small cause significant influence intensity phase.