Abstract
Choking phenomena in circulating fluidized bed (CFB) risers pose a significant challenge to industrial operations. To tackle this concern, multiphase particle-in-cell (MP-PIC) simulations are employed to investigate the impact of varying solids flux, bed height, and riser size on solids transport in CFB risers. The research sheds light on the complex interplay of operating parameters in CFB systems. The transition of solids holdup profiles from exponential to S-shaped curves with increasing solids inventory is observed, accurately predicting the choking point. By adjusting geometric dimensions, the choking point distance from the outlet at a fixed length-to-diameter ratio can be efficiently shifted. The findings provide a deeper understanding of saturation carrying capacity (SCC) in CFB risers, which can be leveraged to optimize industrial performance. This research is instrumental in mitigating choking effects and enhancing the design and operation of CFB systems.
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