The tunnel dryer does not have multiple heaters in the upper and lower sections of the tunnel body. A windshield is fixed on the front side of each skip to separate adjacent carts. The hot air passes vertically through the material layer and is reversed multiple times. The temperature of the hot air can be controlled in stages.
There is another type of through-flow drying equipment in which two tunnels are juxtaposed, and several drying sections are arranged along the longitudinal direction of the whole tunnel. An axial fan is installed in the upper part of each drying section of the two columns of tunnels, so that the hot air passes through the two columns in the section. At the same time, a material layer of the tunnel is input with a certain amount of outside air, and a certain amount of exhaust gas is discharged to perform partial exhaust gas recirculation.
It is provided with the power-off prevention self-heating device at the high temperature section, so there is no hidden risk of fire.
Process parameters relating to heating and running are preset.
The status of the parameters is displayed and records are printed automatically.
The circulation airflow is adjustable to ensure even temperature in the oven.
Temperature measuring points are set in the oven and at the oven ports.