Consistency of Circulating Fluidized Bed Experimental Data

S. Ouyang, O. E. Potter

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Abstract

CFB experimental data from the literature are compared in terms of the ideal no-slip volume fraction of solids, ϵ′s. The lean phase is evaluated as ϵ*s/ϵ′s. It is found that ϵ*s/ϵ′s = 2.6 with a SD of 0.9. The average value of ϵd,s in the dense phase is 0.18, and the standard deviation is 0.05. Also evaluated are Z*d, the fraction of the riser occupied by the dense phase, and Zt, the height of the transition zone between the dense and lean phases. It is found that Zt = 2.25 m with a SD of 1.3 m. With the pressure differential available between the bottom and top of the riser for the given flow conditions (U and Gs), the average solids holdup as well as fractions of the riser occupied by the dense and dilute phases could be estimated. This compilation of data has been made to guide the authors in modeling but may be of interest to others, also. A notable omission from the available data is the pressure drop across the riser which determines the relative proportions of dense phase and lean phase (in the vertical dimension).

Original languageEnglish
Pages (from-to)1041-1045
Number of pages5
JournalIndustrial and Engineering Chemistry Research
Volume32
Issue number6
DOIs
Publication statusPublished - 1 Jan 1993

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