Separation Characteristics of Feedstock at Different Regions in the Gas-Solid Dense-Phase Separation Fluidized Bed

Air dense medium fluidized bed technique has been proposed as an effective technique for dry coal beneficiation. However, different fluidization characteristics and flow conditions of medium solids in different regions are the key factors influencing the separation efficiency of coal. In this study, MATLAB software was employed for investigating the bed spatial structure characteristic under different bed heights and fluidization numbers. The force analysis of particles in radial and axia zones was compared. By dividing the bed regions, the separation effect of the materials in different regions was explored. The results show that the standard deviation and average density of bed density raised with static bed height increased, and the stability of the bed becomes worse. The minimum pressure gradients ratio at axial and radial in fluidized state is 10. A better separation efficiency was achieved under the upper and middle region feeding.