Graduate Thesis Or Dissertation
 

Elutriation from fluidized beds with immersed heat transfer tubes

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  • Elutriation of silica sand particles from a 0.9 X 0.9 m cold fluidized bed was studied. Data were collected for cases with and without tubes. During experiments the position of the tube bundle above the distributor plate and the superficial velocity were varied. Runs were made at velocities of 0.9 , 1.5 , 2.1 , 2.7 and 3.6 m/s , the bottom row of the tube array located at either 0.25 m or at 0.5 m above the distributor plate. The attrition of the sand particles in the cyclones and its effect on the elutriation rate constant were analysed. A new model which takes attrition in the bed into account was developed and compared with the data. Existing correlations were re-evaluated. Elutriation above the transport disengaging height was found to be a function of only particle terminal velocity and superficial velocity.
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