Abstract
This paper describes four simple methods for measuring short residence times (down to 0.1 s) of solid particles in a cyclone reactor: detection of a single particle by use of phototransistors; analysis of the impact of a pulse of particles on piezocrystal probes; study of the profile of the vertical component of the particle velocities by use of a camera; measurement of the space time of the particles by a hold-up method. These four approaches lead to similar results for two kinds of solids (wood sawdust and sand) in a 12.5 × 10 −2 m diameter cyclone reactor operating with carrier gas residence times ranging from 0.5 to 5 s. A simple relationship is proposed for calculating the mean residence time of the particles (which increases with the gas flow rate) as a linear function of their theoretical free fall time through the cyclone and of the gas Reynolds number at the reactor inlet.
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