Fixed-bed batch dryer
What is a fixed-bed batch dryer?
A dryer is a mechanical device or machine that removes the water from wet grains by forcing either ambient air or heated air through the grain bulk. In a fixed-bed batch dryer, the same quantity of grain is kept stationary in a holding bin until drying is completed.
Why do we use fixed-bed batch dryers?
Fixed-bed batch dryers produce better grain quality than sun-drying, especially in the wet season. They are more affordable than re-circulating batch dryers of the same capacity or continuous flow dryers. They have certain advantages too:
The disadvantage is a moisture gradient that develops in the grain bulk during drying from the air inlet to the air outlet.
What are the types of fixed-bed batch dryers?
Bed configurations of fixed-bed batch dryers can either be rectangular (flat-bed dryer), inclined for better unloading, or circular.
Drying air temperature: <43°C
For checking whether a flat-bed dryer has sufficient and even air flow: A sheet of letter sized paper placed on top of the grain must float atop the grain at all locations of the drying bin.
Prepared by M Gummert with inputs from JF Rickman (2004); updated by M Gummert (2010)