Equipping high speed column dryers with tempering sections before the cooling stage should be a standard modification. Tempering allows the moisture gradient that develops inside each kernel to equilibrate and the built-up internal kernel stresses to relax. Turning a grain column inside out along the drying section helps to minimize the inherent moisture gradient that develops across the column. Energy requirements of a conventional crossflow dryer as a function of drying air temperature and airflow rate. Combination Dryers Combination drying systems combine high-temperature drying with slow cooling and drying in bins.
High temperature drying can occur in a continuous flow, automatic batch, or bin dryer.
Transferring corn at too high a moisture content can lead to spoilage problems during the storage season. After a cooling time of 10 - 20 hours the corn is moved into a final storage bin equipped with regular aeration fans. Condensation in the steeping bin is significant. However, because the cooled corn is transferred to a final storage bin wetter kernels are mixed and will tend to equilibrate during aeration in storage. Because no steeping takes place, the fan is turned on as soon as a few feet of hot corn cover the perforated floor.