Gas–Solid Distribution Theory in a Pulsed Fluidized Bed Based on the Intermediate Phase

Abstract

Fluidized bed technology is widely used in chemical industries. The introduction of pulsating energy into a traditional fluidized bed can effectively reduce the generation of bubbles and improve the fluidization quality. The accuracy of gas−solid distributions has a significant influence on the density control of fluidized beds. Here, a gas−solid distribution model and bed expansion prediction model were established with the wake taken as the intermediate phase to make up for the lack of a gas−solid distribution theory in a pulsed fluidized bed. The correlation coefficient of the theoretical model was validated using data obtained from collapse experiments. The linear fitting correlation between the bed expansion height H (p) and correction coefficient Y is quite good. The error of the modified model of the bed expansion ratio was found to be within 20%, which enables it to provide theoretical guidance for industrial applications of pulsed fluidized beds.

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

“…At the same time, the commonly used also has a defect, so the coefficient K can also be corrected for it. Equation is modified to …”

“…The key parameters involved in calculating bed density with eq 18, such as the minimum fluidization velocity u mf , bubble diameter d b ̅ , and phase distribution coefficient Y, were verified in our previous works, which are applicable to all pulsed fluidized beds. 10,29,33 4. RESULTS AND DISCUSSION 4.1.…”