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Computational particle fluid dynamics (CPFD) simulationwas carried out to analyze flow patterns in order to understand themechanism of deposit formation on the cyclone duct during the residuefluidized catalytic cracking (RFCC) process. The CPFD simulation wasbased on the multiphase particle-in-cell (MP-PIC) method, in whichthe particle phase was solved by the stochastic Lagrangian model andthe fluid phase was analyzed by the Eulerian method. In the firststage, a low-speed zone at a duct angle of 90° (an inlet positionof 0°) was discovered in the basic design of the cyclone, andthis zone was predicted to be the initial region of deposit. Casestudies were carried out for several stages of deposit growth to investigatethe effects of deposit size on cyclone performance. A scouring phenomenonwhich hampers deposit growth is expected to occur when the depositreaches 90 mm in thickness. When the deposit reaches 150 mm, the carryoverrate abruptly doubles. [ABSTRACT FROM AUTHOR]