Tailings Dryer Three-drum Dryer

Structural composition:

• Drum body:

It is composed of three concentric cylinders of different diameters. The inner cylinder, middle cylinder and outer cylinder cooperate with each other and play different roles. The inner cylinder is the main drying area. After the wet tailings enter the inner cylinder, they begin to be dried initially; the middle cylinder further enhances the drying effect, so that the tailings are more fully dried; the outer cylinder plays the role of heat preservation and auxiliary drying to reduce heat loss.

• Transmission device:

including motor, reducer, support wheel, wheel belt, etc. The motor provides power, drives the support wheel to rotate through the reducer, and the friction between the support wheel and the wheel belt causes the drum to rotate, ensuring that the tailings continue to roll and move in the drum to fully contact with the hot air flow.

• Feeding device:

The tailings to be dried are transported to the dryer. The stability and uniformity of the feed need to be ensured so that the subsequent drying process can proceed smoothly.

• Discharging device:

It is used to discharge the dried tailings. It has good sealing to prevent hot gas leakage and dust overflow.

• Heat source system:

provides heat for the drying process. Common heat sources include coal, natural gas, biomass particles, etc., which can be selected according to actual conditions.

• Lifting plate device:

Lifting plates with different angles and spacings are provided in the cylinder. Its function is to evenly disperse and turn the tailings in the cylinder, increase the contact area between the tailings and the hot air flow, and improve the heat exchange efficiency.

• Dust removal system:

collects and processes the dust generated during the drying process, reduces pollution to the environment, and is also conducive to the recovery of valuable substances in the tailings.

• Working principle:

The wet tailings enter the inner cylinder from the feeding device, and are continuously picked up and scattered by the lifting plate in the inner cylinder, and undergo preliminary heat exchange with the hot air flow from the heat source system to achieve downstream drying and initially remove most of the moisture. Then the tailings enter the middle cylinder for countercurrent drying. The material is repeatedly lifted in the middle cylinder, which prolongs the drying time and fully absorbs heat. Finally, the tailings fall into the outer cylinder, and are further dried in the outer cylinder and discharged from the discharging device.

Advantages and characteristics:

High efficiency and energy saving:

• High thermal efficiency:

The three-drum structure increases the contact area and heat exchange time between the tailings and the hot air flow. The heat emitted by the inner drum can be partially absorbed and utilized by the middle drum and the outer drum, reducing heat loss. The thermal efficiency can be greatly improved compared with the single-drum dryer, and the energy saving effect is significant.

• Strong fuel adaptability:

It can adapt to a variety of fuels. Enterprises can flexibly choose according to local fuel resources and costs to reduce fuel costs.

Good drying effect:

• Even material drying:

The unique drum structure and lifting plate design enable the tailings to be evenly dispersed and turned in the dryer, avoiding material accumulation and uneven drying, and ensuring that the moisture content of the tailings after drying is uniform.

• High material quality:

The temperature and heat are evenly distributed during the drying process, and the tailings will not deteriorate or agglomerate due to local overheating, which well guarantees the quality of the tailings and is conducive to subsequent processing or comprehensive utilization.

Compact structure:

• Small footprint:

The three-drum dryer has a compact drum structure, and the floor space is only about half of that of a single-drum dryer with the same output, which saves a lot of site space and is very suitable for enterprises with limited space.

• Easy installation:

The overall structure is relatively simple, the installation process is not complicated, and no complex infrastructure and large-scale lifting equipment are required, which can shorten the installation cycle and reduce the installation cost.

Reliable operation:

• Small equipment wear:

The friction between the tailings and the drum and the lifting plate during the drying process is relatively small, which reduces the wear of the equipment and extends the service life of the equipment. And the transmission device of the equipment runs smoothly and has high reliability.

• Simple operation and maintenance:

The degree of automation is high, the operation is simple and convenient, and only a small number of operators are needed to complete the production process. Daily maintenance work is relatively simple and the maintenance cost is low.

• Good environmental performance:

Equipped with an advanced dust removal system, it can effectively collect and process the dust generated during the drying process, reduce pollution to the environment, and meet environmental protection requirements.