Types of choking in vertical pneumatic systems |
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Authors: | H.T. Bi J.R. Grace J-X. Zhu |
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Affiliation: | Department of Chemical Engineering, University of British Columbia, Vancouver, Canada V6T 1Z4 |
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Abstract: | Choking is examined in terms of its definitions. Three choking initiation mechanisms are identified: type A (accumulative) choking occurs when solids start to accumulate at the bottom of the conveyor as the saturation gas carrying capacity is reached; type B (blower-/standpipe-induced) choking results from instabilities due to gas blower-conveyor or solids feeder-conveyor interactions where there is insufficient pressure or too limited solids feed capacity to provide the needed solids flow; and type C (classical) choking corresponds to a transition to severe slugging. Approaches for predicting the onset of each of these type of choking are recommended. Implications for regime transitions in fast fluidization are also identified. |
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Keywords: | choking instability fast fluidization dilute-phase pneumatic transport dense-phase pneumatic transport |
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