What Is the Principle of Operation About Rotary Dryer

Drying machine has the characteristics of high temperature resistant, high temperature hot air can be used for a rapid drying of material. But do you know the working principle of the rotary dryer?

In its simplest form, the cascade dryer consists of a slightly inclined rotating cylinder, fitted with a series of peripheral flights arranged to lift, distribute and transport the material. The flights are designed to suit the particular handling characteristics of the material, which may vary with increasing dryness.

The dryer equipment adopts self-aligning type tug structure, the tug and with good tyre-roller, greatly reduce the wear and tear of power consumption. We can scarcely step into a shop or factory of any description without encountering a mass of belts which seem at first to monopolize every nook in the building and leave little or no room for anything else.

The principle of operation is based on showering, or cascading the wet material through a hot gas stream, flowing either co-current or counter-current to the solids. The hot gas induces the evaporation of the moisture. The heat lost to the material and evaporation of water vapour reduces the gas temperature rapidly, such that it leaves the dryer at a comparatively low temperature.

To overcome the distance and friction limitations of line shafts, wire rope systems were developed in the late 19th century. Wire rope operated at higher velocities than line shafts and were a practical means of transmitting mechanical power for a distance of a few miles or kilometers. Drum dryer mainly constituted by axially symmetrical, Yang stripper plate, gearing, supporting device and seals and other components. Dry wet materials transported to hopper by belt conveyor,and then into charging port through charging pipeline.

The efficiency of the rotary dryer is largely dependant on the differential between the inlet and exhaust gas temperatures, although the heat transfer rate is also influenced by the...