Segregation phenomena of binary solids in a pulsed fluidized bed

Abstract

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. • The pulse effect was observed when the frequency was higher than 1 Hz. • Segregation increased as pulse-type B changed to A at U g = 0.564 cm/s. • At U g = 0.705 cm/s, the pulse effect did not appear at the top of the bed. • Segregation increased 1.4 times with pulsed flow.