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6 - Hydrodynamics of spout-fluid beds

Published online by Cambridge University Press:  04 February 2011

By
Wenqi Zhong ,
Baosheng Jin ,
Mingyao Zhang  and
Rui Xiao
Edited by
Norman Epstein  and
John R. Grace
Norman Epstein
Affiliation:
University of British Columbia, Vancouver
John R. Grace
Affiliation:
University of British Columbia, Vancouver
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Summary

The spout-fluid bed is a very successful modification to the conventional spouted bed. It reduces some limitations of spouting and fluidization by combining features of spouted and fluidized beds. In spout-fluid beds, in addition to supplying spouting fluid through the central nozzle, auxiliary fluid is introduced through a porous or perforated distributor surrounding the central orifice. Compared with spouted beds, spout-fluid beds obtain better gas–solid contact and mixing in the annular dense region and reduce the likelihood of particle agglomeration, dead zones, and sticking to the wall or base of the column. However, the hydrodynamics of spout-fluid beds are more complex than those of conventional spouted beds. This chapter briefly presents up-to-date information on the fundamentals and applications of spout-fluid beds without draft tubes, based on the limited reported work.

Hydrodynamic characteristics

Flow regimes and flow regime map

Different flow regimes occur in a spout-fluid bed when the central spouting gas flowrate and the auxiliary gas flowrate are adjusted. A schematic representation of familiar flow regimes is presented in Figure 6.1. These are the fixed bed (FB), internal jet (IJ), spouting with aeration (SA), jet in fluidized bed with bubbling (JFB), jet in fluidized bed with slugging (JFS), and spout-fluidizing (SF) regimes.

Type
Chapter
Information
Spouted and Spout-Fluid Beds
Fundamentals and Applications
 , pp. 105 - 127
Publisher: Cambridge University Press
Print publication year: 2010

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