Abstract
This paper focuses on developing correlations for better prediction of solids holdups at the dense and dilute regions of circulating fluidized bed risers based on experimental data from the literature and our laboratory. Analysis of the experimental axial profile of solids holdup and the data on ε sd and ε s* has identified a critical solid circulation rate: saturation carrying capacity of gas, G s*, which distinguishes two different variations of ε sd and ε s* with solid circulation rate. In the case of G s< G s*, ε sd and ε s* increase with increasing solid circulation rate and may vary with other system properties, whereas ε sd and ε s* are only the functions of gas velocity and gas-solid properties and change little with the solid circulation rate, the riser diameter, the solids inventory as well as the solid feeding system in the case of G s≥ G s*. Based on these facts, more generalized empirical correlations for estimation of ε sd and ε s* are obtained. Comparisons with experimental data and the existing literature correlations confirmed the validity of the present correlations.
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