Abstract
A commercial dry coal cleaning plant (50 2 6 mm feed) using an air-dense medium fluidized bed has been established in China. It is an important clean coal technology (CCT) due to insufficient water resources in China and abroad. This article studies the fluidization performance and bed density homogeneity of a vibrated fluidized bed and a double-density fluidized bed. The experimental results obtained with a 2000 mm 2 80 mm 2 200 mm model apparatus showed that the vibrated fluidized bed can efficiently separate <6 mm fine coal with an E p value of 0.07 and a lower separation limit of 0.5 mm. A double-density fluidized bed was formed by specially designing the bed structure with a pyramidal part. It can produce three products in a fluidized cascade at aseparation density of 1.49 g/cm 3 with an E p value of 0.06 and a separation density of 1.85 g/cm 3 with an E p value of 0.07.
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