Abstract
ABSTRACT Fluidized bed technology plays a vital role in petroleum, chemical, and coal separation. The dry separation of coarse coals with a particle size of >6 mm has been efficiently achieved using the fluidized bed. However, for fine coal with a particle size of 6–1 mm, ordinary fluidized bed technology is unable to effectively separate it. In light of this issue, the present study incorporates airflow vibration energy into conventional fluidized beds, with a specific focus on the separation process of fine coal. The investigation explores the variation pattern of separation density and delves deep into the influencing factors affecting coal preparation through bed density. A theoretical model for separation density is established based on the characteristics of bidisperse particles, which is subsequently validated and calibrated using dry separation experiments conducted on fine coal. The error is controlled within 10% while achieving a possible deviation E as low as 0.095 g/cm3.
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