Axial hydrodynamics

Type :

Term papers

Pages :

7 pages

Format :

.doc

Published date :

05/22/2009

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Summary :

 
 

Table of Contents Axial hydrodynamics Table of Contents

 
  1. Introduction
  2. The characteristics of fluidization regimes
  3. The behavior of a high velocity circulating fluidized bed
  4. Extending entrainment models developed originally for bubbling fluid beds
  5. Findidngs
  6. Comparing hydrodynamic characteristics among different flow regimes of gas fluidized beds
  7. Conclusion

Abstract

Many studies have appeared in the literature dealing axial solids distribution along CFB risers (e.g. Yerushalmi et al, 1976: Kwauk et al, 1986: Arena et al 1991, Bai et al 1992). It is most often represented as either a plot of the radially averaged solids suspension density or voidage versus height. This profile is experimentally determined from the pressure distribution along the riser, recognizing that the suspended solids constitute the major contributor to the pressure drop.

The experimental work of Yerushalmi et al (1976) is generally considered as the pioneering academic study of the axial solids distribution in circulating fluidized bed riser. They discussed the densification at the riser base and proposed several advantages of operating in the fast fluidization regime.

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