Abstract
While gas dispersion has been determined in CFB risers operated at low solids fluxes, data are lacking with respect to the high-density conditions common in FCC risers and other catalytic processes. In this paper experimental results are reported showing gas residence time distributions obtained using helium tracer and FCC particles for a 76 mm diameter riser of height 5.6 m with net solids fluxes extending up to 480 kg/m 2s. A radially non-uniform dispersion model is proposed and compared with the axially dispersed plug flow model to determine the gas dispersion coefficients. The results show that gas backmixing becomes small for dense suspension upflow conditions where there is no downflow of solids near the riser wall.
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