A distinctive feature of the KAHL
fabric belt drier is the special, tightly
woven plastic fabric belt which fulfils
two functions: Transport of the
product to be dried and filtration of
the exhaust air to ensure that the
legal limit value of the dust loading
in the exhaust air is not exceeded.
Discontinuous automatic cleaning of
the belt avoids clogging of the belt
Measurements by independent
institutions have confirmed the
observation of the limit value. The
average value was less than half the
admissible value. Requiring very low
inlet air temperatures of less than
120°C, the drier is particularly suitable
to be operated with waste heat from
cogeneration. Another advantage
is the low concentration of volatile
organic compounds (VOCs) in the
exhaust air resulting in very low odour
The newly developed product supply
system allows the supply of a uniform
layer of product to be dried, even if
the input material and the throughput
capacities vary significantly. The
product is turned over in the drier by
means of specially adapted devices
so that a very uniform final moisture
content of the product is obtained.
The on-line measurement of the
product moisture ensures that the
drier is constantly operated with an
The fabric belt drier in a wood pelleting plant
optimum energy consumption and
that the residual moisture is kept at
a defined value.
Belt widths of 4 m or 6 m are possible.
The efficient belt lengths available
for drying are 11 m to 45 m.