Thermal dryers convey material into a stainless steel cyclone and discharge it through the bottom opening into the dryer via a rotary airlock valve.
Below the rotary airlock valve, ambient air is sucked into the system through a heat exchanger. Heat is generated by means of electrical heating registers, gas burners, or steam.
The material stream is sucked together with the hot air into the blower. Passing the blower, the product is agitated with the hot air, and blown through a circle-shaped drying section of about 100 feet in length to create the necessary dwell time to allow the hot air to absorb the humidity. A thermal sensor constantly measures the temperature and displays it in on an electric panel.
A pressure control device constantly checks airflow. In the case of a material jam, the sensor would switch off the warm air supply.