SIDE-OUTLET SPOUTED BED WITH INNER DRAFT-TUBE FOR SMALL-SIZED SOLID PARTICLES

Abstract

In the commonly used top-outlet spouted bed, the solid particles are restricted in size to relatively coarse ones. As suggested by Mathur and Lim, the use of coarse particles would not be advantageous for carrying out heterogeneous gas-phase reactions.
This paper describes an attempt to reduce the particle size for the side-outlet spouted bed which was previously proposed. Particles as small as those used in the fluidized bed may also be used in the side-outlet spouted bed with inner draft-tube.
The gas conversions have been calculated, based on the observed gas flow pattern in the annulus, for the cases of both independent and dependent of reaction rate on particle size. From the results of the calculated gas conversions, it was found that the side-outlet spouted bed with inner draft-tube gave higher gas conversions than any other spouted beds.
The structure of the gas outlet has been reformed so as to be suitable for the use of small-sized particles. Instead of putting screens on the gas outlet openings, a stationary solid bed has been attached outside the openings surrounding the annnulus.