Henan Dajia Mining Machinery Co., Ltd.

Add.: 500 meters west, Rizhao Road and Industrial Road, Mazhai Industrial Zone, Zhengzhou City, China
Tel.: +86-371-67575157
Fax: +86-371-67575197

Home » Product » Drying Equipment » Rotary Drum Dryer

Rotary Drum Dryer

The rotary drum dryer has many uses throughout various industries. It consists of a drum that provides a temporary room for drying operation. In fact, it is not the drum that does the drying action. Instead, the hot air coming from outside actually dries the material to a desired result. Large handling capacity, easy repair, and long service life are major benefits of the dryer for its owners.

Our rotary drum dryer can be used to dry a wide range of materials. Building sand, waste tailings, recycled material, ores, powders, coals, and even new energy materials can be processed by this equipment. Selecting a right dryer for your applications depends on a number of considerations, including the variety of heating fuel, local job site conditions, and local environmental protection requirements.

The main structure of the drum dryer is shown in the above picture. As you can see from the picture, there is a huge girth gear fitted around the circumference of the rotary drum. Below the girth gear is the gear motor assembly which comprises of an electric motor, gear reducer, electric control, and small driving gear. The small driving gear fitted around the output shaft of the gear motor meshes with the huge girth gear (driven gear) around the drum, transmitting rotational motion. As the girth gear rotates, the drum rolls along.

The internal structure of drum comes in various configurations. It can be supplied with material lifting fins, helical screw, or partition wall. Heat medium can sometimes passes along the drum in the same direction as the feed material (co-current), though usually in the opposite direction (counter-current).

Work Principle
Wet materials to be dried is lifted to the hopper by belt conveyor or bucket elevator. The hopper temporarily stores the material. When the time comes, it supplies the material to the drum dryer inlet through a pipe. The pipe should be inclined at an angle larger than allows the material to naturally fall down into the dryer.

The drum sits at a low angle from the level ground. When the material flows from a higher end downward to the drum, it is met by another flow of heating medium that enters from the bottom of the drum. Hence, a counter-current is formed to allow a maximum contact area between the heating medium and heat material. Granted, the flow of feed stock can be in the same direction as that of heating medium.

As the material moves downward, it comes into direct or indirect contact with a heated medium, thereby getting dried. After the drying process is done, the material is discharged via the belt conveyor or spiral conveyor to the outlet.

One noteworthy feature of the drum dryer is the lifter plate installed on the inside drum wall. The lifter plate lifts the material up before it falling back down. This lifting and falling action is to increase the chance of material contacting with the heated gas, thus improving drying efficiency. The said heating medium can be hot air, or flue gas. After the drying process, the heating medium needs to pass through the cyclone separator whereby the particles carried by the medium are captured in the separator. To further reduce the particulate material contained in the off-gas, we recommend the bag house or wet scrubber be used to purify the gas.

Technical Specification
Model (mm) Inclination (%) Rotate Speed (r/min) Air Inlet Temperature
(° C)
Production Capacity
Weight (t)
600×6000 3-5 3-8 ≤ 700 3 0.5-1.5 2.9
800×8000 3-5 3-8 ≤ 700 4 0.8-2.0 3.5
800×10000 3-5 3-8 ≤ 700 4 0.8-2.5 4.5
1000×10000 3-5 3-8 ≤ 700 5.5 1.0-3.5 5.6
1200×10000 3-5 3-8 ≤ 700 7.5 1.8-5 14.5
1200×12000 3-5 3-8 ≤ 700 11 2-6 14.8
1500×12000 3-5 2-6 ≤ 800 15 3.5-9 17.8
1800×12000 3-5 2-6 ≤ 800 18 5-12 25
2200×12000 3-5 1.5-6 ≤ 800 18.5 6-15 33
2200×18000 3-5 1.5-6 ≤ 800 22 10-18 53.8
2200×20000 3-5 1.5-6 ≤ 800 30 12-20 56
2400×20000 3-5 1.5-5 ≤ 800 37 18-30 60
3000×20000 3-5 1.5-5 ≤ 800 55 25-35 78
3000×25000 3-5 1.5-5 ≤ 800 75 32-40 104.9

Related Names
Industrial Dehumidifier | Mineral Drying Machine | Tube Dryer

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