Numerical Simulation on Gas–Solid Flow Characteristics in Circulating Fluidized Bed Desulfurization Tower

Abstract Circulating fluidized bed flue gas desulfurization (CFB‐FGD) is a semi‐dry desulfurization technology. The tower structure significantly influences gas–solid flow, critical to desulfurization efficiency. Tower bottom, diffusion section, and bypass tubes are numerically simulated. Two indices, CV value (assessing particle uniformity) and mass‐weighted life of particles (determining particle residence time), are employed for quantitative analysis. Results show that adjusting tower bottom structure minimally affects gas‐particle distribution. Increasing diffusion section height reduces backflow area. Larger bypass tube diameter improves gas uniformity. Particles concentrate in the mainstream zone, reducing wall collisions. This study would be conducive to providing a theoretical basis for the optimal design of CFB‐FGD and better understanding the interaction between flue gas and solid particles in the CFB‐FGD tower.