Drying and breaking behavior of hot air heavy medium fluidized bed

Abstract

The drying and crushing behavior of air heavy medium fluidized bed was studied, and the effects of surface moisture, drying temperature, drying time, air volume and other factors on the content of crushed pulverized coal and droped pulverized coal were investigated. A mathematical correlation of crushed pulverized coal content and a mathematical correlation of droped pulverized coal content were established. The results show that the mathematical correlation of crushed pulverized coal content and the mathematical correlation of droped pulverized coal content can well simulate the drying and crushing behavior of fluidized bed. The increase of surface moisture, drying temperature, drying time, air volume and other operating parameters of coal will lead to the increase of crushed pulverized coal content and the decrease of droped pulverized coal content. In the stage of fluidized bed drying, coal does not produce much pulverized coal. The pulverized coal less than 1mm produced by falling coal is much larger than the pulverized coal produced by crushing in the fluidized bed, and the larger the operating parameters are, the more obvious the influence on the pulverized coal content is.