Three-drum dryer

1. Dryer structure diagram

Note: 1. Outer cylinder 2. Middle cylinder 3. Inner cylinder 4. Wheel belt 5. Support wheel 6. Reduced motor 7. Support seat

2. Working principle of dryer
The structure of the three-drum dryer is shown in Figure 1. The main body of the telescopic three-drum dryer is composed of three concentric cylinders of different diameters embedded in each other. The main body rolls on four supporting wheels at both ends through wheel belts. The feeding end of the cylinder is equipped with hot air furnace devices such as oil, steam, and coal. The unloading end is equipped with a dust cover and an automatic unloading device. The dust cover is connected to the dust collector through a pipeline. Dust removal equipment, feeding equipment and conveying equipment can be designed separately according to user process conditions and requirements.
The material to be dried is fed into the inner cylinder of the dryer from the feeding end. The material enters the inner cylinder through the spiral guide plate of the inner cylinder. There are many spiral lifting plates inside the inner cylinder. The material is continuously lifted up by the lifting plates and moves longitudinally through the rotation of the cylinder. When the material reaches the left end of the inner cylinder, it falls into the middle cylinder due to its own weight. Through the guide plate, the material is pushed back to the middle cylinder under the action of the rotation of the cylinder. Under the action of the lifting plates in the middle cylinder, the material moves to the right.
Until the right end of the middle cylinder, the material falls into the outer cylinder under the action of its own weight. Similarly, the material turns back and moves to the left under the action of the spiral lifting plate of the outer cylinder until the left end of the outer cylinder, and falls into the cylinder at the discharge end under the action of the outer guide cone. As the cylinder rotates, the material is lifted by the spiral lifting plate in the cylinder, while constantly rolling, scattering, and moving longitudinally toward the discharge end. At the same time, the hot air flow from the hot air furnace enters the inner cylinder, the middle cylinder, and the outer cylinder successively to exchange intense heat with the material. Since the metal steel plate conducts heat faster than the material to be dried, the steel plate and the lifting plate of the cylinder are heated first, and then the heat is transferred to the material by conduction and radiation. After being heated, the temperature of the material rises until the water evaporates, and it is separated from the material and discharged into the atmosphere after passing through the dust collector with the smoke, thereby achieving the purpose of drying the material.

The three-drum dryer has a compact structure and occupies only half the area of ​​a single-drum dryer with the same output. It has the characteristics of reliable operation, low energy consumption, high thermal efficiency, good material drying effect, easy to realize automatic control, and requires fewer operators.

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