Energy Conservation for Continuous Flow Dryers
- Heat Recovery
Heat recovery on continuous flow column dryers can save 10 to 15% by recycling the exhaust air
from the cooling or lower heating section of the dryer. For a dryer with a cooling section, heat recovery
can be done by drawing a percentage of the intake air for the heating section through the grain to cool
the grain while preheating the air entering the heating chamber. Air can also be recycled from both the
lower heat section and the cooling section to reclaim additional heat. Recycling air does reduce dryer
capacity slightly depending on the moisture content of the recycled air.
- Cooling Options
Cooling grain in a dryer reduces capacity and rapid cooling will cause kernels to stress crack
which may lead to lower value of the grain. Using a full heat dryer and transferring the grain to a
bin for cooling at a slower rate will save energy and improve grain quality. The grain can be
transferred to the cooling bin at 1 to 3 % moisture above the desired storage moisture level depending
on the cooling method used. Dryeration will save the most energy and provide the best grain quality.
Refer to Midwest Plan Service publication MWPS-13 for an explanation of Dryeration.
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