Abstract
Abstract: Fluidized bed technology plays a vital role in petrochemistry
and coal separation. To enhance fluidization stability, the flow is
periodically introduced into the gas-solid fluidized bed to form a
pulsed gas-solid fluidized bed. As the main fluidization parameter, the
minimum fluidization velocity (umf) can reflect the change of the
critical state of particles in the pulsed gas-solid fluidized bed,
directly affecting the study of two-phase distribution in the bed. Due
to lack of theoretical study on umf in pulsed gas-solid fluidized bed,
the work proposed a novel method to predict umf comibined with soft
sphere model. Meanwhile, the spring-damping and the resonance force
models were established under the action of pulsating airflow. A
theoretical model of umf was then derived for pulsed gas-solid fluidized
bed based on experimental stress analysis of particles. The novel
correlation is basically agreement with almost available data in the
literatures and present work.