Abstract
In this study, a computational fluid dynamics (CFD) model was developed to analyze the behavior of coarse coal particles in a 3D liquid-solid fluidized bed. The model combined a Eulerian-Eulerian approach for the liquid-solid two-phase flow with the kinetic theory of granular flow. First, the study conducted a grid independence analysis to determine the appropriate grid model parameters, ensuring reliable simulation results. Then, the developed CFD model was validated by comparing its predictions with experimental data. Specifically, the expansion degree of both low-density fine particles and high-density coarse particles was examined at various superficial liquid velocities. The simulation results were found to closely match the experimental data, confirming the accuracy of the proposed mathematical model. Next, the study investigated the effects of particle size and density on the fluidization behaviors within the bed.