Do You Know the Function of Limestone Dryer?

Limestone rotary dryer is suitable for many combustion furnaces: high temperature fluidized bed, grinding powder coal stove and artificial added coal stove. The heat source of the limestone dryer machine is coming from burning device, with this type of dryer adopting the heat ways of concurrent flow. Thus, the materials should be added from the feeding box and the feeding gutter to the cylinder. Since the dryer is put slantly, some of the materials are flowing to the trailing end under the gravity and the rotary force, other materials are risen by the shoveling plate over and over again to the upper and then being scattered to form an even curtain. Because of the continuous scattering, the content of water in the materials will be dried to achieve to the effect.

The limestone dryer is made up of a large, rotating cylindrical tube, usually supported by concrete columns or steel beams. The rotary 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 rotary drying machine 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 machine, 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 prehted. When the gas stream is preheated by some means where burner combustion gases do not enter the dryer, the limestone dryer equipment is known as an indirect-heated...