What is a triple pass rotary dryer?

Thiple pass rotary dryers consist of three lighter-duty drums of differing diameters nested inside each other. It is a modification of the single pass drum dryer and reduces the overall size of the drying equipment. The three drums are not set on a slope, but rather relies on pneumatic conveying to carry material through the unit.

Working principle

1. Materials will be constantly lifted up by lifting boards, and scattered in spiral type to make hot exchange.
2. And then, material will be moved to middle layer of drum for counter current drying, and materials in middle layer of drum will be constantly lifted up by lifting boards. Materials in middle layer of drum can both full absorb heat generated by inner drum layer, and heat generated by middle drum layer, while extend drying time, so materials reached its driest state in this process.
3. Material can move to the outer drum layer from the middle drum layer, material reached the drying effect will be discharged fast along with hot air, while wet materials have not meet the drying effect can' t move quickly due to high weight, so wet material can get adequate drying to reach drying effect thus achieve to complete the drying process.

Application

Triple pass rotary dryer is mainly used for drying a certain humidity and size of granular materials, such as yellow sand used in dry powder and mortar, various specifications of sand used in a foundry industry, blast furnace slag used in building materials and cement industry, clay in a small size, small materials, which have no chemical changes, resists high temperature and are with flyblown dust, used in chemical industry. In accordance with the request of materials and water in different industries, water in materials which are dried can be below 1-0.5%.

The materials entering the dryer should not stick to the cylinder wall and the lifting plate. The temperature of the gas entering the dryer for heat exchange should not be higher than 750 ℃. If there are special requirements for high temperature drying, the inner cylinder and lifting plate at the entrance of the dryer can be made of heat-resistant steel plate.

Features

1.Smooth and reliable operation

The main drum of the dryer is placed horizontally, and the front and rear roller groups are supported horizontally. It is driven by the motor gear or the roller group, and the operation is smooth and stable.

2.Small footprint

The volume of the three-drum dryer is half that of the vertical or traditional drum dryer, and the cost of infrastructure and plant layout is greatly reduced.

3.High thermal efficiency, short drying cycle, and guaranteed dry material quality

The three-layer sleeve dryer has high thermal efficiency, short material drying cycle, and appropriate moisture content of the dry material.

4.Convenient operation, few faults, and high safety

The three-drum dryer is centrally controlled by the transformer and distribution cabinet. The start and stop of each accessory and each production link do not require manual participation. It is easy to operate, with small errors, safety and efficiency.

Conclusion

When choose rotary drying machine, please inquiry professional rotary dryer manufacturer. The engineer will suggest suitable dryer equipment according the heating source, drying material, plant size, capacity, material moisture and other factors. Welcome to contact us to learn about the more rotary dryer case.