Numerical simulation study on mixing characteristics of binary Geldart-D particles in a pressurized fluidized bed

Understanding the mixing behaviors of different particles is significant for improving the mass and heat transfer performance of a pressurized fluidized bed. A numerical simulation study on the mixing behavior of binary Geldart-D particles in a pressurized bubbling fluidized bed is performed based on the CFD-DEM method. The mixing characteristics and bubble behavior of binary Geldart-D particles with different physical properties under elevated pressure are investigated in the current study. Increasing the fluidization gas velocity u(g )and operating pressure P could promote the mixing of the particles. Raising the operating pressure P would cause a smaller bubble size and large bubble quantity at the same fluidization number u(g)/u(mg). Higher operating pressure P and fluidization number ug/umg could create a stable and uniform distribution of jetsam in the fluidized bed.

Automated summary

Understanding the mixing behaviors of different particles is crucial for improving the performance of pressurized fluidized beds. In this study, a numerical simulation based on the CFD-DEM method was conducted to investigate the mixing characteristics and bubble behavior of binary Geldart-D particles in a pressurized bubbling fluidized bed. The results showed that increasing the fluidization gas velocity and operating pressure promoted particle mixing, while higher operating pressure and fluidization number created a stable and uniform distribution of particles in the fluidized bed.