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Fluidization of solids with CO2 at pressures from ambient to supercritical

✍ Scribed by Antonio Marzocchella; Piero Salatino

Publisher: American Institute of Chemical Engineers
Year: 2000
Tongue: English
Weight: 196 KB
Volume: 46
Category: Article
ISSN: 0001-1541
DOI: 10.1002/aic.690460505

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Beds of two granular materials belonging to groups A‐B and B of the Geldart classification of powders were fluidized by carbon dioxide at 35°C and at 1 to 80 bar. Within this pressure interval, spanning from subcritical to supercritical conditions, the fluid density changes from the values typical of dilute gases to those of liquids. The hydrodynamic behavior of the bed changes accordingly. The bed behavior was investigated by visual inspection of the bed and by analysis of the time series of the pressure drop across the bed and of the heat‐transfer coefficient between the bed and a hot wire probe. The boundaries between different captive fluidization regimes—incipient fluidization, onset of bubbling, and the incipient and fully established turbulent regime—were mapped in gas superficial velocity vs. fluid density phase planes for the two granular materials investigated.

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