Segregation phenomena of binary solids in a pulsed fluidized bed

Segregation tests were conducted using a cold-bed system in a pulsed fluidized bed with binary solid species. The effects of superficial gas velocity (U_g), pulse frequency (f), and amplitude (A) on segregation efficiency were investigated. The range of U_g was 0.423–1.41 cm/s, the range of f was 0–2 Hz, and the range of A was 0.052–0.331 cm/s. At non-pulsation conditions where U_g was higher than the minimum bubbling velocity (U_mb), the jetsam was more prone to be located at the top of the bed than at the middle of the bed. For the pulsed gas flow, the effect of pulsation on segregation was observed when f exceeded 1 Hz. When U_g is close to U_mb, as the amplitude increases, the pulsation also affects the top of the bed, thus increasing the degree of segregation. When U_g was 1.43 U_mb, the degree of segregation did not increase, as the pulse effect did not appear at the top of the bed. At the optimal pulse condition, the degree of segregation was increased by 1.4 times compared to that in the non-pulsation condition.