Prediction of minimum and complete fluidization velocity and transport disengaging height of the segregated coal in a cold flow fluidized bed

Abstract

The low-grade coal has been taken in the 40 mm ID acrylic fluidized bed column to examine the minimum fluidization velocity (Umf), complete fluidization velocity (Ucf), and transport disengaging height (TDH) of different size groups of fine coal. The results reveal that the Umf and Ucf increase as the particle diameter increases, but the TDH has the opposite trend. Ucf is found to be two to three times of Umf for all particle sizes. New correlations for the prediction of Umf and TDH in terms of Reynolds number and Archimedes number for coal fines have been established based on the experimental study. The developed correlations have shown strong agreement with experimental values, with variances for all samples falling within a ± 10% range.