Rotary Dryer

Rotary Dryer

  • Volume: 9-285m3
  • Capacity: 1.9-76t/h
  • Application scope: Chemical, mining, and metallurgy, specifically for large particles and heavy materials, such as ores, blast furnace slag, coal, metal powders, phosphate fertilizer, and ammonium sulfate. And drying powdery or granular materials with special requirements, such as HP foaming agents, distillers' grains, lightweight calcium carbonate, activated clay, magnetic powder, graphite, and pharmaceutical residues.
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  • Technical parameters
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The rotary dryer, also known as a rotary drum dryer, is widely used in the building materials, metallurgy, chemical, and cement industries for drying materials such as slag, limestone, coal powder and clay. The rotary dryer is primarily composed of a rotating drum, lifting blades, a transmission device, support equipment, and sealing components. It offers advantages such as a reasonable structure, well-crafted design, high production output, low energy consumption, and ease of operation.


High efficiency: Rotary dryers have a carefully calculated ratio of length and diameter, ensuring the ideal retention time for materials inside the dryer. This helps achieve a satisfactory drying effect. Additionally, the designed angle of the lifting plates increases the thermal contact area without damaging the materials, improving heat exchange efficiency. Efficient radiator, and with a reasonable lead air duct, so that the hot air can direct contact with materials, greatly improving the drying efficiency and saving energy.

Strong adaptability: Rotary dryers are simple in structure and can be designed to meet the drying requirements of various materials. The ratio of length and diameter can be adjusted to accommodate different material characteristics. This adaptability extends to the site requirements as well, allowing for customization based on available space.

Versatile heat sources and fuels: Rotary dryers offer the flexibility to choose the most suitable heat source and fuel based on factors such as cost and environmental considerations. The dryers can be heated by burning HFO, LFO, NG, CNG, LNG, LPG, wood, husk directly or flue gas, steam, or other sources indirectly.

Easy maintenance and operation: Rotary dryers are designed for easy maintenance, ensuring smooth and hassle-free operation. The operation of the dryers is simple and user-friendly, making it convenient for factory personnel to operate and maintain the equipment. The roller of rotary dryer machine is made of light plate's stainless steel which has excellent heat resistance, the inner-wall smooth, can reduce the materials' wear and tear.


After wet materials are introduced into the dryer, they are uniformly distributed and dispersed within the drum under the action of the evenly spaced lifting blades. The materials come into full contact with co-current (or counter-current) hot air, which accelerates heat and mass transfer for drying. During the drying process, the materials are controllably moved to the other end of the dryer, where they are discharged through a star-shaped discharge valve.
Wet material is transported by a belt conveyor or a bucket elevator to a hopper, and then it is fed into the feed end through a feeding machine and a feeding pipeline. The slope of the feeding pipeline needs to be greater than the natural angle of the material to ensure smooth material flow into the rotary dryer. The dryer's drum is a rotating cylinder slightly inclined to the horizontal line. Materials are introduced from the higher end, and the heat-carrying medium enters from the lower end, making counter-current contact with the material. The heat-carrying medium and material may also flow into the cylinder together.
As the drum rotates, the materials are moved to the lower end under the influence of gravity. During the movement of wet materials within the drum, they receive heat directly or indirectly from the heat-carrying medium, which facilitates drying. Then, at the discharge end, they are conveyed out through a belt conveyor or a screw conveyor.
Inside the rotary dryer's drum, there are lifting boards that scoop up and drop the materials, increasing the contact surface between the materials and the airflow to enhance drying rates and promote material movement. The heat-carrying medium is typically hot air or flue gas. After passing through the dryer, the heat-carrying medium often requires a cyclone dust collector to capture any entrained material. If further reduction in the dust content of the exhaust gas is necessary, it should go through a bag filter or a wet scrubber before being discharged.

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Drum size(m) Volume(m3) Capacity(t/h) Incline angle(%) Max tempt of inlet air(℃) Power(kw) Weight(t)
Φ1.2x8 9 1.9-2.4 3-5 700-850 7.5 9
Φ1.2x10 11.3 2.4-3.0 3-5 700-850 7.5 11
Φ1.5x12 21.2 4.5-5.7 3-5 700-850 15 18.5
Φ1.5x14 24.7 5.3-6.6 3-5 700-850 15 19.7
Φ1.5x15 26.5 5.7-7.1 3-5 700-850 15 20.5
Φ1.8x12 30.5 6.5-8.1 3-5 700-850 18.5 21.5
Φ1.8x14 35.6 7.6-9.5 3-5 700-850 18.5 23
Φ2.2x12 45.6 9.7-12.2 3-5 700-850 22 33.5
Φ2.2x14 53.2 11.4-14.2 3-5 700-850 22 36
Φ2.2x16 60.8 13.0-16.2 3-5 700-850 22 38
Φ2.4x14 63.3 13.5-16.9 3-5 700-850 37 45
Φ2.4x18 81.4 17.4-21.7 3-5 700-850 37 49
Φ2.4x20 90.4 19.3-24.1 3-5 700-850 45 54
Φ2.4x22 99.5 21.2-26.5 3-5 700-850 45 58
Φ2.6x24 127.4 27.2-34.0 3-5 700-850 55 73
Φ3.0x20 141.3 30.1-37.7 3-5 700-850 75 85
Φ3.0x25 176.6 37.7-47.1 3-5 700-850 75 95
Φ3.2x25 201 42.9-53.6 3-5 700-850 90 110
Φ3.6x28 285 60.8-76.0 3-5 700-850 160 135

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Integrating R&D, production, distribution, and service-providing into one enterprise, EVERED attaches great importance to communication with customers. We have established an after sales visit team consisting of more than 56 persons. On the one hand, they timely solve the problems that our customers encounter; on the other hand, they collect feedback and improvement recommendations from our customers, to correctly orient our development and research.

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