Influence of Exit Configuration on the Hydrodynamic Behaviors of a High-Density Circulating Fluidized Bed Riser

The influence of three different exit configurations (L-shape, T-shape and V-shape) on the hydrodynamic behaviors was investigated in a high-density circulating fluidized bed (HDCFB). The solid circulation rate G s was up to 865 kg/(m2s) by using the Geldart group B silica sand (particle density ρ p...

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Bibliographic Details
Main Authors: Shengdian Wang, Shaojun Yang, Kai Zhao, Liangliang Liao, Xiang Xu, Yunhan Xiao
Format: Conference Proceeding
Language:English
Subjects:
Bismuth
Cyclones
Hydrodynamics
Mathematical model
Sensors
Solids
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Summary:The influence of three different exit configurations (L-shape, T-shape and V-shape) on the hydrodynamic behaviors was investigated in a high-density circulating fluidized bed (HDCFB). The solid circulation rate G s was up to 865 kg/(m2s) by using the Geldart group B silica sand (particle density ρ p is 3092 kg/m3, Sauter mean diameter d p is 106 μm) as bed material. Under high G s conditions, no increase of solid concentration was observed using the L-shape, T-shape and V-shape abrupt configuration, which was different from the previous published results. However, the solid concentration increased obviously near the riser exit zone under low G s conditions with the V-shape configuration. Composition of the pressure drop near the exit region was analyzed. The pressure drop across the reducing pipe (ΔP rp ) accounted for the most part of the total pressure drop. A theoretical model of ΔP rp was derived based on Bernoulli Equation, which can be used to predict the solid circulation rates.
ISSN:2157-4839
DOI:10.1109/APPEEC.2011.5749045