Self-sustained oscillations of a fluidized bed

Abstract

Self-sustained oscillations of fluidized bed have been considered, as well as the concerted periodic change in their integral parameters, including the average porosity and height, the flow rate of a fluidizing agent, and the pressure drop across the apparatus. The main factors are revealed, the joint effect of which at a certain combination of the system parameters results in the development and occurrence of this phenomenon. Mathematical models have been formulated for four reactor schemes, i.e., open and closed devices with blowing and open and closed devices that blow open with the suction of a fluidizing gas. Solutions are obtained in the form of damped oscillations and undamped oscillations with finite amplitude. An analysis of the stability of stationary solutions has been carried out. Calculations have been performed for the conditions of experiments known from the literature. The results of a comparison of the calculated and measured values for the frequencies of fluidized bed oscillations have been presented.