Abstract
The distribution of residence times of two-component tracer mixture (Ar and CO 2) was measured in bench scale fluidized beds consisting of porous (γ-Al 2O 3) and/or non-porous (quartz sand) particles as a function of the temperature. For Ar no temperature dependence was found, in contrast with CO 2, for which the mean residence time is mainly controlled by the adsorption. From the temperature dependency of the mean contact time the adsorption enthalpy can be estimated. The temperature has only slight effect on the Peclet number and/or the coefficient of longitudinal dispersion. The measured bubble diameter, wake fractions and coefficients of mixing were used to test the applicability of the bubbling model of Yoshida and Kunii and its extended version without using any fitting parameter. With non-adsorbing gas (Ar) partial agreement, with adsorbing gas (CO 2) disagreement was found.
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