Numerical simulation of gas-solid flow characteristics in pressurized bubbling fluidized bed based on CFD-DEM method
Numerical simulation study on a pressurized bubbling fluidized bed was carried out based on a coupled CFD-DEM approach using an open-source software(Mfix)in order to clarify the basic laws of gas-solid two-phase flow in a pressurized bubbling fluidized bed and the influencing mechanism of pressure,which provides useful reference for the design,operation and scale-up of pressurized bubbling fluidized bed reactors in various industrial processes.Firstly,the numerical model was verified by the experimental data from the thin rectangular pressurized bubbling fluidized bed.Based on this,the influence of operating pressure on the critical fluidization velocity of Geldart B-type particles,the particle movement and distribution laws,as well as the bubble size and frequency distribution at different operating pressures were systematically studied.The numerical simulation results show that the critical fluidization velocity of Geldart B-type particles decreases with the increase of operating pressure in the range of 0.1 MPa to 0.7 MPa,and the critical fluidization velocity changes more obviously with the increasing pressure under low operating pressure conditions.In addition,as pressure increases,the bubble size decreases,leading to improvement in bed uniformity.
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