Characteristic research of regeneration process of particulate filter medium in vibrated fluidized bed

Abstract

The vibrational fluidized bed is innovatively adopted to regenerate the particulate filter medium for the purification of crude synthesis gas from the coal gasification process. Characteristic research of vibrated fluidized beds during dust-containing particulate filter medium regeneration has been carried out. The ideal transport model of particulate filter medium on the distributor is established and verified by using experiments. The mean residence time of the particulate filter medium can be reduced by 72% from 5.5 to 1.5 min with an increase in the working frequency from 50 to 60 Hz. The thickness of the bed layer is linearly increased with the feeding rate of the particulate filter medium under ideal working conditions. The resistance models of the fluidizing air are built up and validated, and they can be used to calculate the pressure drop of the static bed layer of the particulate filter medium on the fluidizing air distributor, which is the maximum value of the dynamic bed layer with the same thickness. The fluidizing air makes the mean residence time of the particulate filter medium decrease by 50% and reduces the difference in the particulate mean residence time under different feeding-rate conditions. The regeneration effect of dust-containing filter medium particles in a vibrated fluidized bed is evaluated. Fluidizing air with superficial velocity ranging from 0 to 0.6~0.9 m·s–1 makes the regeneration efficiency increase from 29.41% to 70.59~88.24%. This article provides a reference for the industrial application of a vibrated fluidized bed for the particulate filter medium recycling system.