The tumble dryer can be divided into different types by the way of heat transfer when drying materials. What are the specific classifications? The author will take a look at it for you.

Indirect heat transfer type: heat is indirectly transferred to the material by the high temperature gas heating the metal sleeve. This type is suitable for drying powdery materials that cannot be polluted by coal ash or easily dusted, but the heat transfer efficiency is relatively poor.

Direct heat transfer type: The high temperature gas and the material are in direct contact with the material in the cylinder, and the heat is directly transferred to the material. This type is suitable for drying materials that are not sensitive to high temperature flue gas and materials that are not afraid of coal ash pollution.

Double heat transfer type: the hot gas first passes through the sleeve, and the heat is indirectly transferred to the material through the sleeve, and then from the inside of the sleeve to the outside of the sleeve to directly contact the material for heat transfer. It is more suitable for drying bituminous coal and can avoid Fire, explosion or loss of volatiles.

Different heat conduction methods affect the drying effect of materials. When selecting equipment, customers choose suitable equipment according to the characteristics of materials.