TRAY DRYER

The dryers are made of trays held in a cabinet which is connected to a source of air heated by Electric & Gas. The air temperature is usually controlled by a thermostat which is normally set between 50 and 250 Deg C. The air enters the bottom of the chamber below the trays and then rises, through the trays of material being dried, and exits from an opening in the top of the chamber. In the Practical Action systems the trays are designed to force the air to follow a longer zigzag route which increases the air / material contact time and thus improve its efficiency. This system also reduces back pressure which means that cheaper, smaller fans can be used. The airflow in a typical system.

There are different size of tray drier as per no of tray 12 tray To 192 tray.