Operating instructions

3.2. Drying hopper (optional)
The material is dried in the drying hopper. The dehumidified air (2) is forced
through the material in the hopper, collecting moisture in the process. The drying
hopper must be dimensioned according to its intended use to ensure that the final
moisture content is attained. When the hopper is filled for the first time or at the
start of a drying procedure, the material in the hopper must be dried completely
before material can be removed from the hopper for the first time.
When material is continuously removed from the hopper, material must also be
continuously fed into the drying hopper. The new (moist) material is fed into the
drying hopper from the top and slowly moves downward toward the material
suction box. As the material moves upward, it is dried until its final moisture
content is attained.
If several drying hoppers are connected to one dryer, the feed and return pipes
are each equipped with a throttle valve by means of which air volume can be
regulated. The feed opening and material temperature can be read at the control
system (optional).
Flow indicators are available as auxiliary equipment; these allow comparison of
the air flow in the individual drying hoppers.
To ensure proper continuous drying, we recommend that the drying hopper
always is kept completely filled. Automatic conveyors, such as the models
included in our delivery program, optimize the automation of the material flow.
F
When material is continuously removed from the hopper, but
no material is continuously fed into the drying hopper (batch
drying), the material level may not fall below 40 %.
Close the throttle valves.
CTT 300
Functional description 3-3