Bubble Behaviour in Gas-solid Fluidized Beds with Co-axial Rod, Disk and Blade Type Promoters

Abstract

In this article, the bubble behaviour in terms of minimum bubbling velocity, bubble size and minimum slugging velocity for gas-solid fluidized beds with co-axial promoters have been studied. Three different types of promoters namely, rod, disk and blade having equal blockage volume and supported by a multi-orifice distributor plate have been used. The minimum bubbling velocities in beds with and without promoters have been observed experimentally with five different particle sizes and the constants of Geldart1 formula have been obtained for the respective beds. For identical operating conditions, the comparative values for the minimum bubbling velocities, bubble dia and minimum slugging velocities (experimental and calculated) in case of un-promoted and promoted beds have also been obtained. Important inferences with respect to bubbling and slugging in promoted beds have been presented in this study.