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Several Main Types of Rotary Dryers

7/7/2014 8:11:03 AM7/7/2014 8:11:03 AM

Rotary dryer is generally used for drying granular materials, but can also be used for drying sticky and pasty materials or materials with higher water, such as sand, slag, coal, manure, cow dung and other materials. This article will introduce you several main types of rotary dryers according to their different heat transfer ways.

Direct heat transfer rotary dryer

Direct heating dryer is a kind of rotary dryer in whose cylinder the high-temperature gas can contact with the material in a direct way, and the heat is transmitted directly to the material. This kind of dryer is mainly used in the materials which are insensitive to the high temperature gas and not afraid of coal dust pollution, such as, slag, clay and other granular or small bulk materials.

Indirect heat transfer rotary dryer

Direct heating dryer is a kind of rotary dryer in whose cylinder the high-temperature gas can not contact with the material in a direct way. The heat is transmitted to the mental cylinder and then transmitted to materials. The heat transfer efficiency of this kind dryer is poor. It is suitable for drying materials that can not be contaminated by ash, and powder materials, such as ammonium sulfate, calcium carbonate, barium carbonate, strontium carbonate, magnesium carbonate, basic iron carbonate, barium sulfate, activated clay, and etc.

Compound heat transfer rotary dryer

To the compound heat transfer rotary dryer, the hot gas enter into the sleeve firstly and transfer its heat to the sleeve to preheat for materials; then the hot gas goes out and contact with materials directly to further dry materials. This kind of rotary dryer is suitable for drying materials which is easy to fire, explode and happen other accidents, such as coal, ammonium sulfate, calcium carbonate, barium carbonate, strontium carbonate, magnesium carbonate, basic iron carbonate, barium sulfate, and etc.

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