Opening the center hatch of the bin can create real problems especially when a leg spout unloads into the bin and the support structure of the stirrator is anchored there also. As the air exhausts from the center hatch it has plenty of opportunity to condense moisture on the cold steel of the hanging support structure. Keeping the center hatch closed and adding additional vents to the roof reduces this problem. High Speed, High Temperature Column Dryers Batch - Only a few batch column dryers are sold new today. Most of the new high speed, high temperature column dryers available are continuous flow dryers that allow for a batch mode if needed.
Batch drying is inefficient, slow and takes too much supervision.
Because batch dryers in operation today are generally quite old, the primary operational problem is with maintenance. One common oversight is making sure the temperature sensor is installed at the proper location. It's a good idea to install more than one sensor, or at least to move the one built-in sensor to several locations in the plenum to determine the coldest and hottest spot. Having the sensor at the cold spot will create significantly hotter temperatures in the rest of the dryer, which causes overdrying and stress cracking of the corn. Placing the sensor in the hotter part of the dryer will assure that overdrying is minimized.