Study on Radial Velocity Distributions of Particle Flow in Shaft Kiln, I

Abstract

It's well known that heat transfer to the reacting surface is the rate controlling step for some reactions such as the calcination of lime or dolomite in shaft kiln.Therefore to know the behaviours of particles flow in shaft kiln is of the most importance. In this paper, determination was made on the velocity distributions of particle flow in shaft kiln, using the apparatus showed in Fig. I. Tracer particles were added on the top of the apparatus and velocity distributions in vertical semi-cylinder were observed and measured. The next equation was obtained for the radial velocity distribution.(u0-u)/(u0-uw)=(r/DT)2+mIn the boundary layer having velocity gradient the bulk density of particle layer shows great difference, and there are some important relations between velocity distribution and bulk density. The value m above mentioned well accounts for this reason.