advanced and proven triple-pass technology in Duske rotary dryer
seven drying zones gained through Duske’s stepped
cylinder design start with a smaller inlet diameter that provides
high air velocities and high drying rates in the high air temperature
zone. This keeps product temperatures relatively cool, as known
from sound principles of heat transfer.
contrast, drums with large inlet diameters and low hot air velocities
are less efficient because they require 30°- 60° F. higher
dryer outlet temperature in order to obtain desired moisture content.
Depending upon dryer size, this results in additional fuel
cost of $5,000 - $30,000 per year at current fuel prices.
This fact has been proven in actual plant operations drying blood
and bone meal.