A presentation on the hydrodynamic modeling of circulating fluidized bed

Type :

Presentation

Slides :

42 slides

Format :

.ppt

Published date :

05/22/2009

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Table of Contents A presentation on the hydrodynamic modeling of circulating fluidized bed Table of Contents

 
  1. Introduction
  2. Objectives
  3. Procedure
  4. Radial solids flux variations
  5. Results and discussions
  6. Modeling aspects
  7. Calculation of entrainment flux

Abstract

Fluidization is an operation through which fine granular solids are transformed into a fluid like state through contact with a gas or liquid. An increase in the gas velocity through a granular solid brings about changes in the mode of gas solid contact in many ways. Among the several flow regimes of fluidization, bubbling fluidization is most popular. Another is high velocity fluidization, which includes both turbulent and fast fluidization. When the gas velocity of bubbling bed is increased, a turbulent bed emerges. Further increase of gas velocity results in nothing being retained in the bed, but if solid particles are continuously fed into, bed density can be controlled by solid feed rate. A bed of this nature is called "circulating fluidized bed (CFB)" because a high velocity gas is used to circulate an appropriate quantity of solids particles in this operation.

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