Biomass gasification can be performed in dense phase sand fluidized beds. The proposed model involves Computational Fluid Dynamics Multiphase Particle-In-Cell (CFD-MPPIC) simulations, allowing the evaluation of bubble dynamics and bubble drag correlations. The proposed model accounts for a single bubble injection into a unit loaded with 520-µm sand particles and 2.7 cm × 0.7 cm cylindrical wood pellets. Model development also includes the selection of an adequate number of computational cells, the sizing of the particle-in-cell population, and the cell distribution throughout the column. Predictions of the proposed CFD-MPPIC Model were compared with bubbles measured by the HESC Model (Torres Brauer et al., 2020). This data was obtained in a 0.44 m diameter Plexiglas unit, using CREC-Optiprobes and a spherical cap bubble assumption. It is anticipated that the CFD-MPPIC Model could have significant value for the design of scaled-up biomass units operated under dense phase fluidization conditions.