Rotary drier is the materials drying device, the material in the rotating cylinder is dried in the process of spiral leaf and discontinuous spiral feed tube between the inner and outer turn-back. Sleeve structure can multiplied reduce the length of the dryer, as the cooling surface reduces, so that the loss of heat is reduced, double the number of heat exchange surface greatly enhance thermal efficiency. For the untouched tobacco materials, multi-tube rotary dryer provided the inside smoke pipe and circular pipe respectively in both inside and outside the cylinder, the smoke flue pipe use of radial to communicate, the same energy efficient, it is easy to see, for the heat material and cool media, he machine used as sleeve rotary cooler machine.

The rotary dryer is mainly composed by the revolving body, lifting plate, driving device, supporting device, sealing ring and other components. So it has the advantages of reasonable structure, perfect in workmanship, high yield, low energy consumption, convenient to operate.

Material to be dried enters the dryer, and as the dryer rotates, the material is lifted up by a series of internal fins lining the inner wall of the dryer. When the material gets high enough to roll back off the fins, it falls back down to the bottom of the dryer, passing through the hot gas stream as it falls. This gas stream can either be moving toward the discharge end from the feed end (known as co-current flow), or toward the feed end from the discharge end (known as counter-current flow). The gas stream can be made up of a mixture of air and combustion gases from a burner, in which case the dryer is called a direct heated dryer. Alternatively, the gas stream may consist of air or another (sometimes inert) gas that is preheated. When the gas stream is preheated by some means where burner combustion gases do not enter the dryer, the dryer known as an indirect-heated type. Often, indirect heated dryers are used when product contamination is a concern.

Rotary dryer can dry many kinds of materials which contain moisture, such as coal, coal slurry, slag, industrial waste, and clay stone. Rotary dryer are widely used in building materials,metallurgy, and chemical industry. Rotary dryer is handling by bringing it into direct contact with a heated gas. The dryer is made up of a large, rotating cylindrical tube,the dryer slopes slightly so that the discharge end is lower than the material feed end in order to convey the material through the dryer under.

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