A.-J. Yan, J. (Jing-Xu) Zhu, P.-J. Remize and A. Bordas
To successfully model, design, and optimize the catalyst flow in a commercial scale riser, it is essential to obtain the fundamental knowledge from pilot scale risers, especially the knowledge of the solids distribution in longer circulating fluidized bed risers. This governs the pressure drop along the CFB riser, is directly related to the solids residence time in the riser and can also affect gas-solids contacting efficiency, heat and mass transfer rates, and chemical reaction selectivity. Here the influence of solids inventory, solids fluxes, superficial gas velocity, and riser diameter on the axial solids holdup profiles is reported by measuring pressure drops with pressure transducers along two risers.