Layer Drying
Layer drying is very similar to natural air/low temperature drying, except the grain is placed into the drying bin in layers normally about 4 to 5 feet deep. An initial batch or layer of grain is placed in the bin and drying is begun. A drying zone is established and begins to move through the grain. Other layers of grain are periodically added so that a depth of wet grain exists ahead of the drying zone.
Limiting grain depth to get a higher air flow rate allows drying a crop at higher moisture contents than the system can handle on a full-bin basis. In a bin designed for 1 cfm/bushel on a full-bin basis, the air flow rate is estimated to be about 4 cfm/bushel if the bin is one fourth full.
Advantage:
Disadvantages:
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Adding additional wet grain too rapidly can result in spoilage of the upper layers.
Other Grain Drying Methods
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