Industrial Rotary Dryers

Product Details

We offer Industrial Rotary Dryers. They consist of a relatively long cylindrical shell, supported by two riding rings running on a set of rollers. They are slightly inclined from the horizontal, the slope enables the material to move from the feed to the discharge end under gravity. They are suitable for a wide range of materials of varying size and composition.:

Internal lifters, or flights, are used to lift, distribute and transport the material. This produces a shower, or cascade, of wet feed material through the hot gas stream, which promotes evaporation of the moisture and breaks up lumps to produce a more uniformly dried material. The hot air is introduced either at the feed end such that it moves in the same direction as the material (co-current) or at the discharge end such that it moves in the opposite direction (counter-current).

The co-current direct-heat rotary dryer is the most common, wet material is in contact with the hot gas stream as its highest temperature, which causes rapid evaporation of surface moisture. As it progresses through the dryer, heat energy is lost to the material it is drying and it leaves the dryer at a comparatively low temperature. In co-current dryers, the initial heat transfer is high, which causes a considerable drop in temperature thus preventing overheating of the material and the dryer itself. The final dried product is discharged with the gas stream at its lowest temperature, which ensures the moisture content can be readily controlled. Counter current dryers are more suitable for material that must be dried to very low moisture contents or where the last traces of moisture are difficult to remove.

Co Current Rotary Dryer

Product Details

We offer Co Current Rotary Dryer. Wet feed in contact with the hottest drying gases from an internal burner, providing higher thermal efficiency, where heat transfer is by convection and radiation. Suitable for heavy ores, crushed rock, and stone, sand, slag, refractory materials, limestone/clay separation.

Indirectly heated rotary dryers and calciners are available for dusty, finely divided materials and low to medium temperature calcining applications. The rotary drum is partially enclosed and externally heated by a series of burners mounted in an insulated stationary chamber or jacket. Alternatively, the products of combustion from an external heater may be recirculated to increase thermal efficiency.

Direct Fired Rotary Dryer

Product Details

Manufactured in our state-of-the-art technologically advanced facilities, these high-quality refractory lined, Direct Fired Rotary Dryer or Direct Fired Calciners are also supplied for high-temperature applications where it is necessary to change the 'state' of the material. Since this process usually requires a long residence time, the length to diameter ratio is often in excess of 10:1. In most cases, an oil or gas burner fires directly into the discharge end of the unit. The material is heated in three ways - by radiation from the burner flame, conduction from the refractory lining and convection by contact with the hot gases.