The change in drying rate could reflect
the fluidization conditions in the fluidized bed indirectly because the
drying rate was high under good fluidization conditions. Prior to drying,
the minimum fluidization velocities of dry sawdust of different sizes
were determined in a cold model unit, and a velocity of 0.32 m s−1
was found to give a stable fluidization of 20 g sawdust sample.