Influence of Secondary Aeration Angle on Particle Flow Characteristics inside Fluidized Bed Particle Receivers
In order to investigate the influence of different secondary aeration angles on the particle flow characteristics inside solar fluidized bed particle receivers,a numerical calculation method that couples the Eulerian-Eulerian two-fluid model with a heterogeneous filtered drag force model was employed to sim-ulate the distribution of particle concentration and velocity in the receiver under the three secondary aera-tion angles of 30°,45° and 60°.The results indicate that compared with the homogeneous drag models(Gidaspow and Wen-Yu),the calculation result filtered drag model agrees well with the experimental re-sult;under the three secondary aeration angles,the particles in the receiver exhibits the"core-annular"heterogeneous radial distribution with dilute center and dense wall in the receiver,and particles on the sidewalls circulate towards the central area,demonstrating significant particle aggregation;when the sec-ondary aeration angle is 45°,compared to the aeration angle of 30° and 60°,the particle distribution on the section of inlet of the secondary aeration region exhibits greater uniformity,without particle back-mix-ing to the aeration inlet.
fluidized bed particle receiversgas-solid two phase flowsecondary aeration inletnumeri-cal simulation
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