The advantages of the Fluid Bed Dryer, CONTACT FLUIDIZER™ include its
compact design, high thermal efficiency and low gas throughput. Compared
to fluid beds without heating surfaces, two-stage flash/fluid bed dryers, or
rotary dryers - include its compact design, high thermal efficiency, and low
gas throughput.
Fluid Bed Dryer Design
The rectangular fluid bed dryer system, CONTACT FLUIDIZER™ incorporates
back-mix and plug flow sections. A rotary distributor disperses the wet feed
evenly over the back-mix section equipped with contact heating surfaces
immersed in the fluidized layer.
The heating surfaces of this fluid bed
dryer are designed to avoid deposits and obtain a high heat transfer in the
fluidized layer, and they provide a significant portion of the required
energy. Therefore it is possible to reduce both the temperature and the
flow of gas through the system. This is particularly important for heat
sensitive products. Specially designed perforated gill plates allow
handling of oversizes and minimize powder holdup by grade changes.
The
heating panels can be inspected or cleaned externally. Cleaning in place (CIP)
of the whole plant is often provided. Subsequent plug flow sections are
used for postdrying and cooling, if required.