Abstract
<p class="TextCxSpFirst">This article describes intensification of the fluidized-bed drying process for regenerated spherical-shape ion exchanger particles in the batch mode, achieved by a mechanical stirrer in the fluidized bed layer of the dried particles. The effect of the mechanical stirring system on the drying process was examined.</p> <p class="TextCxSpLast">Calculations as well as results of comparison measurements provide evidence of a favourable effect of stirring on the total drying time as compared to the initial unstirred system. The regenerated ion exchanger particles pass to the fluid state in a shorter time and the ultimate total drying time is thus more than 60% shorter.</p>
Highlights
This study seeks savings in fluidized-bed drying of particles in batch mode, the particles being highly adhesive due to the surface tension of the liquid adhering to the particles
Fluidized-bed drying is a drying process in which intensive heat and mass transfer occur between the particles that are present in the fluid state and the air flowing through the bed
A solution may be found in drying with a fluidized bed layer which is stirred [1,2,3,4] and where the particle clusters are disintegrated continuously and the particles adhering to the drying chamber walls are swept off due to the stirring process
Summary
This study seeks savings in fluidized-bed drying of particles in batch mode, the particles being highly adhesive due to the surface tension of the liquid adhering to the particles. The surface tension of the liquid adhering to the surface of the particles at the beginning of the drying process gives rise to a strong tendency for the particles to stick to each other and to the walls of the drying chamber. The batch mode of this process together with the insufficient amount of material present in a batch does not allow a vibro-fluid dryer to be used, since these dryers are mainly designed for continuous mode. A solution may be found in drying with a fluidized bed layer which is stirred [1,2,3,4] and where the particle clusters are disintegrated continuously and the particles adhering to the drying chamber walls are swept off due to the stirring process
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