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The axial and lateral solids mixing in a down-flow circulating fluidized bed of 0.418-m diameter was investigated by a pneumatic injection phosphor tracer technique (PIPTT). The axial and lateral solids dispersion were determined by measuring the solids RTD at same axial but different lateral positions using point sources for tracer injection. A two-dimensional dispersion model described the measured...
Local transient solid fraction and particle velocity signals were measured in a 0.418-m I.D. and 18-m high large-scale circulating fluidized bed (CFB) by a dual-optical fiber density probe and a Laser Doppler Velocimeter (LDV) system. The probability density distributions (PDD) of transient solid fraction and particle velocity show bimodal distributions in the riser, while in the downer, the PDD curves...
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