Effect of scraper movement on the separation performance of air dense medium fluidized bed

Experimental studies on the influence of scraper movement on the fluidization of air dense-medium fluidized bed (ADMFB) have been conducted. The maximum bed pressure drop is about 3% when the scraper speed changes from 0 to 0.5 m/s. The minimum fluidized velocity Umf decreases as the scraper speed increases. At the same time, the bed density only declines by 3.7%, and the density standard deviation decreases significantly which is mainly caused by the horizontal motion of the medium. The separation tests indicated that the most appropriate scraper speed is between 0.1 m/s and 0.3 m/s and it was reasonable to move the scraper at the appropriate rate to get the better separation performance.