Description
The rotary dryer is a type of industrial dryer employed to reduce
or minimize the liquid moisture content of the material ,it is
handling by bringing it into direct contact with a heated gas. The
dryer is made up of a large, rotating cylindrical tube, usually
supported by concrete columns or steel beams. 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
gravity. 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. In some cases, a combination of direct-indirect heated
rotary dryers are also available to improve the overall
efficiency.
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