Study On Weakening Size Influence Of Inclined Plates In Liquid-Solid Fluidized Bed

In order to solve the problems of particle size reducing the gravity separation efficiency and limiting the processing capacity of the equipment, combined with the fluidized bed fluidization and the inclined plate sedimentation, the study on the separation and sorting of the material was studied by adding the inclined plate group to the fluidized bed. The characteristics of fluid velocity distribution and shear lift in the inclined channel provide the conditions for weakening the particle size and improving the particle size separation.The paper mainly uses kinematics and dynamics to analyze the movement of solid particles in inclined channels, the relationship of particle size affecting particle motion and the relationship between water velocity particle size and the relationship between particle equilibrium position and particle properties was established. With the help of the experimental study of the model particles, the verification and correction of the established relationships was carried out.Based on the single sedimentation model, the influence of the density and particle size on the separation of multiple particles is deduced: Lpd = k ??2.45/d1.14?The trajectories of glass beads ( 0.2-0.4mm?0.4-0.6mm ) and magnetite particles(0.2-0.3mm ) under different water velocity and plate spacing were studied respectively. The test results show that the trajectories of the particles were significantly changed in the 6mm plate spacing channel and the effect of particle size was weakened during the separation of the materials.The relationship between velocity and particle characteristics is deduced by analyzing the velocity balance and force balance of the particles in the inclinedchannel under laminar flow conditions: U'=0.0479d0.14(?p-?f)0.71g0.71z/?0.29f?0.43, and thevelocity equilibrium position x1 and the force equilibrium position x2 :(?),as well as to characterize thematerial separation capacity ?. The 0.2-0.8mm glass beads and 0.125-0.3mm magnetite were selected at a water velocity of 0.09m/s and 0.15m/s to further verify the effect of the weakened particle size, the separation effect of less than 0.5mm glass beads is explained by the theory of disturbance sedimentation. Therefore, the effective separation size range of different water velocity materials can be predicted by the equilibrium relationship and the separation water velocity of the given granular materials is predicted.Using the equilibrium relationship equation to predict the 0.25-2mm slime sorting water velocity was 0.065m/s in the 6mm plate spacing channel. Reclaiming 2kg slime particles at a rising water velocity of 0.0315m/s, 0.0473m/s, 0.0699m/s and 0.0896m/s, respectively. Comparing the results of the sorting test with the results of floating test to determine the separation of the slime particles at a water velocity of 0.07m/s, 25.68% of the raw coal ash was reduced to about 12% and the coal yield was 65%.