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Residence time distributions in a fluidised bed in which gas adsorption occurs: stimulus-response experiments

✍ Scribed by J.G. Yates; J.A.P. Constants

Publisher: Elsevier Science
Year: 1973
Tongue: English
Weight: 564 KB
Volume: 28
Category: Article
ISSN: 0009-2509
DOI: 10.1016/0009-2509(73)80085-5

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✦ Synopsis

Ahstraet-This paper describes stimulus-response experiments with a fluidised bed of porous cracking catalyst in which two tracer gases, one adsorbable and one non-adsorbable, were used. It is shown that the moments of the response curves are strongly dependent on the degree of adsorption of the tracer gas, and that with an adsorbable tracer the dense phase gas is almost completely mixed at gas velocities ii excess of 3.3 uti

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A stochastic model based on Markov chain is proposed to describe the gas residence time distribution and contact time distribution in multistage fluidised beds. The Kolmogorov-Feller equations are solved by Laplace transform and subsequent numerical inversion. The effects of flow fluctuations on the