A tempering silo is used to cool the grain after drying and before being transferred to a prolonged storage. The tempering silo allows the dryer to be used more economically because the drying process is much more efficient with high moisture content than in the final stages of the drying process.
The tempering silo or cooling bin is a temporary storage silo that is placed after the dryer and can have different uses, such as:
- To store grain temporarily during the first stage of the project, before being transferred to the definitive storage.
- To serve as temporary storage or lung of the dryer when the humidity of the grain requires another drying cycle.
- It is used in the Dryeration method, which increases the performance and efficiency of the dryer.
The Dryeration method is a process developed at Purdue University in the late 1960s, that modifies the high-speed drying process by transferring the hot corn to a cooling bin, eliminating in-dryer cooling. The hot corn is allowed to “steep” or “temper” in the cooling bin at least 4 to 6 hours before being cooled slowly. After cooling, the corn is transferred to storage. Dryeration provides three advantages over high-speed drying with in-dryer cooling: increased dryer capacity, reduced fuel consumption, and better corn quality (less stress cracking, less fine material, higher test weight).
Sources: FAO, University of Minnesota
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