Particle suspension hydrodynamics in a tapered gas agitated reactor

Abstract

Experiments were carried out in a tapered gas agitated solid‐liquid‐gas (S‐L‐G) reactor at 4 reactor volumes (up to 4 m3 ) with 4 different slurry densities (up to 40 mass%). Using monodisperse sand particles (260 μm diameter) at a low specific power input (ranging from 50‐300 W/m3), minimal suspension was achieved. The spatial solids hold‐up distributions were determined using a specially designed sampling probe. In combination with a mathematical model, the measurements show that a decrease in the ratio of the eddy length and the particle diameter (le/dP) takes place at increasing slurry densities. At a solids hold‐up of about 0.4, the critical lower limit (l < le/dp < 5). below which no suspension state can exist, is reached.

Heat Transfer and Hydrodynamics in a Three-Phase Slurry Bubble Column

“…The productivity of the catalytic slurry reactor for such applications as Fischer-Tropsch synthesis and methanol synthesis can be increased by increasing the volumetric catalyst loading. High solid phase loading is also important for contaminated soil slurry bioreactors (Kleijntjens et al, 1994). High solids concentrations, however, can lead to problems of mixing and low heat and mass transfer rates.…”