Vibration energy transfer in a forced oscillation fluidized bed

Abstract

Fluidized bed technology plays a vital role in petroleum, chemical, and coal separation. To improve fluidization stability, airflow is periodically introduced to form a pulsed gas–solid fluidized bed. The vibrating airflow drives the particles with vibration energy transfer and dissipation in the pulsed fluidized bed. The fluidization quality will be greatly improved when the pulsation frequency is equal to the natural frequency. The understanding of the mechanism governing vibration energy transfer and dissipation enables further adjustment of parameters to effectively control the fluidized bed, thereby optimizing its operational state. In this work, the response mechanism of the fluidized bed to resonance effect is described, and its vibration energy transfer and dissipation mechanism is investigated. Furthermore, an evaluation index for energy dissipation rate is proposed. Additionally, based on the theory of spring oscillators, an enhanced natural frequency model for bubble-free fluidized beds is established in this study, incorporating particle properties and bed height as key factors. The predicted error is effectively controlled within 15%, demonstrating excellent agreement with existing literature and research findings.