Prediction of Bed Density in a Pulsed Gas-Solid Fluidized Bed

Pulsed fluidized beds can reduce bubble generation and improve coal separation accuracy. The reasonable regulation and prediction of bed density are essential to improve the separation accuracy. However, existing bed density correlations are not applicable to pulsed fluidized beds because the pulsating energy affects the behavior of particles and bubbles, and the wake is also a key factor affecting the bed density. This work proposed a novel method of predicting bed density combined with gas-solid distribution theory. When compared with experimental results, the error of this prediction correlation was less than 10%. The distribution characteristics and change trends of the bed density under different operating conditions were also analyzed. This work offers a theoretical foundation for effective separation of coal with pulsed gas-solid fluidized beds.