AM-96-48 Comparison between Single and Two-Stage FCC Regenerators

Description:

Several fluid bed regenerator designs are used commercially in Resid Fluid Catalytic Cracking (RFCC). These regenerators span the fluidization regimes of bubbling, turbulent, and fast fluidization, and the designs vary significantly. Two of the key differences in regenerator design for RFCC units are: J Single-stage vs. a two-stage fluid bed regenerator J Operation in full vs. partial CO combustion This paper endeavors to explain the key design and operating differences between these designs and explore their impact on catalyst activity, make-up, and regenerator emissions. A mathematical model used to predict the performance of regeneration systems is discussed and results of model simulations are used for design comparisons.