Optimization of simulation model adaptability and CFD of particles of Geldart-B in a gas–solid fluidized bed for silicone monomer synthesis

The flow characteristics of gas–solid in fluidized bed reactors constrain or promote the reaction process by affecting gas–solid mixing homogeneity, heat transfer timeliness, and fluidization stability. To improve the production efficiency of silicone monomers, this work shows a comparative analysis of the effects of geometric modelling in different dimensions, flow state, and the interphase exchange coefficient on the characteristics of particles of Geldart-B in a gas–solid fluidized bed for silicone monomer synthesis based on two-fluid models (TFM). The results of different dimensional simulations show that the third dimension plays an important role in the bubble behaviour and the particle volume fraction spatial distribution within the fluidization zone, and the three-dimensional simulation results are closer to the experimental data, and the maximum average error of the simulation results is 4.52% lower than that of the two-dimensional simulation results. Meanwhile, the flow model has a greater influence on the bubble behaviour during the flow process, whereas the interphase force model has little effect on the flow state of small-diameter particles. However, for large-diameter particles, the interphase force model is closely related to the bubble behaviour and the direction and size of the vortex, and the lift model prediction of bubble breakage and coalescence behaviours are higher than the experimental results from the power spectrum results. The inlet velocity has a greater effect on the formation of vortices near the wall; with the same inlet velocity, the more dispersed the particle distribution in the bed, and the more uniform the gas–solid mixing. (author)