gas-distribution deck in a fluidized bed unit
Distribution decks using
CONIDUR® - hole plates have a distinct advantage due to their
unique Jet-shaped conical hole, which enable a sharp air flow
of intense heat, but allow openings to remain clear
One most important reason for an increasing number of bulk materials
being thermally treated in fluidised bed units, is the resulting
high economic efficiency achieved from the intensive heat and
material exchange between solid material and fluid medium.
This is largely
due to type of gas distribution plate or distribution deck, which
is an essential component of any fluidised bed dryer installation.
CONIDUR® screen hole sizes start at 50 micron
Many installations are proving very satisfactory when handling
a variety of materials with different humidities, physical and
CONIDUR® gas distribution plates are precisely selected for
a required pressure drop, to ensure the fluid medium is distributed
evenly to the solid material, but also to prevent the material
from falling through the plate or clogging in the event of zero
gas pressure beneath the plate.
The even distribution of the fluid medium is achieved by using
a minimum of pressure under the gas distribution plate, but also
dependent on the product characteristics and the dumping height
in the installation. Specific material selection and finish also
play an important part in avoiding adhesion.
following products have been handled in fluidised bed units
organic acids paints salts fertilizers insecticides
synthetics detergent additives
coffee cocoa tea sugar milk powder cereals
vegetables baby food gelatine instant foods
coal quartz sand mould sand
important factor of CONIDUR® gas distribution plates
is the gas velocity over the distribution plate. This
has to be smaller than the sinking speed of the smallest
particles in the fluidised product bed, otherwise too
much of the product will be carried along by the gas
flow, requiring recovery in a filter or cyclone.
specific applications may require changes in airflow
direction. This is easily achieved with selective positioning
of CONIDUR® gas distribution plates to alter the
direction of product flow as required.