Rotary Drum Dryer

Rotary dryer cylinder body

Product Name: Rotary drum dryer
Diameter: 1 – 3 meters
length: 10 – 25 meters
Condition: brand new.
Motor Power: 5.5 – 75 kW

AGICO is a heavy machinery supplier in China. Having a professional engineer team, we have earned our reputation with many successful domestic dryer projects. You can count on us to design and manufacture a suitable rotary dryer for your business.

AGICO rotary dryer features

Our R&D team is constantly improving our own design and at the same time learning the advanced experience in the industry to ensure that the rotary dryer we manufactured will always have the following features:

  • High production efficiency;
  • High processing capacity;
  • Durable material, reliable quality;
  • High flexibility, can process various materials;
  • Weak fluid resistance, high energy efficiency;
  • Various drive assemblies.

What is a rotary dryer?

The rotary dryer is a type of heavy dryer machine that is widely applied in both agriculture and industry for bulk material drying.

The rotary drum dryer in a cement plant.
Rotary drum dryer

Rotary dryer machines mainly rely on the heated air to dry the material. The main body of the rotary dryer is a slightly inclined rotary cylinder. Wet materials are fed into the cylinder from the upper end, heated and dried by hot gas, and discharged from the lower end.

In more than twenty years of rotary dryer project construction process, AGICO has accumulated numerous experiences about how to create a good rotary dryer for the client. And on the basis of these experiences, we continuously improve our dryer design and update our manufacturing equipment, in order to provide customers with the best quality rotary dryer solutions.


We supply a wide range of rotary dryer models, so customers may choose the best suited one for their business. Send your inquiry now!

Product Sizes (m)Production Capacity (t/h)MotorReducerWeight (t)
Ф1×101.0-3.5Y132M2-65.5ZL350-Ⅱ-25 7.5
Ф1.2×102.5Y160M-67.5ZL50-16-1 13.5
Ф1.5×123.3-4.9180L-615JZQ500-Ⅲ-2F 18.9
Ф1.5×154-6Y200L-618.5JZQ650-Ⅲ-2F 21
Ф2.4×1412Y250M-637 31.551


Rotary dryers are often applied to dry granular materials with high water content. You may spot them in many industries processing various types of materials.

In the cement industry, rotary dryers are often used to dry cement raw meals and raw materials such as limestones and gypsum.

Because high water content in raw materials may reduce the efficiency of cement crushers, and slow down the crushing process, the fresh limestones sent from quarries are best dried in rotary dryers before feeding into crusher machines.

In agriculture, rotary dryers are used to process fertilizer, biomass, animal feeds, and agriculture by products, etc.

In mining industry, several of minerals including limestone, clays, gypsum, sand, coke, bauxite, etc. can be dried by rotary drum dryers.

In coal industry, rotary dryers are applicable for the drying of coal slime, raw coal, lignite, mixed refined coal, power plant fuel, and flotation coal, etc.

And chemical industry, metallurgy industry, food production industry, construction materials and other industries, the list goes on. They all employ rotary dryers for bulk material drying.

Structure Design

The main parts of a rotary dryer include a rotary drum cylinder, two riding rings, a gear guard, a drive assembly, a burner, a combustion chamber, an exhaust handling system, drum shell ridings, and so on.

Design structure introduction of rotary drum dryer.
Direct rotary drum dryer structure

There are also optional components including a gas generator, supporting hoist, belt conveyor, quantitative feeder, cyclone dust collector, induced draft fan, etc. You can choose if you need them according to your production requirements.

Rotary Dryer Working Principle

When the bottom temperature of the rotary dryer is heated between 400℃ and 800℃, the materials can be fed into the dryer cylinder from the upper end. Under the influence of gravity and the rotation of the cylinder, the material is dispersed and evenly moves to the lower end of the cylinder.

At the same time, the hot air stove at the lower part of the dryer generates high-temperature hot airflow, which enters the cylinder from the lower end and moves upward. When the hot air contacts the material, the heat is transferred from the air to the material by means of heat conduction, convection, and radiation. With the temperature of the material increasing, the moisture content in the material gradually evaporates.

There are many flights on the inner wall of the cylinder. With the rotation of the cylinder, these flights constantly throw the materials to make them fully in contact with the hot air and improve the drying efficiency.

Finally, the dried material is discharged from the discharge port at the lower end of the cylinder, and the gas with steam is extracted by the fan from the chimney, and the drying process is completed.

Flights on the inner wall of rotary drum dryer shell.
Inner view of the drum cylinder

Rotary Dryer Type

According to the different methods that the materials are heated, the rotary dryers can be divided into two types: the direct rotary drum dryer and the indirect rotary drum dryer.

Direct Rotary Drum Dryer

In direct rotary drum dryers, the processing materials directly contact with the drying air and are heated through convection. This type of heat transfer possesses a higher thermal efficiency, which makes direct rotary drum dryers the most widely applied rotary dryers.

Indirect Rotary Drum Dryer

In indirect rotary drum dryers, the processing materials are not directly contacted and heated by the drying air. Instead, they are dried by making contact with the drum shell, which is heated to a high temperature by the hot air. Generally, this type of rotary dryer is applied when the processing material is best not to be contacted by hot drying air.

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