Sand and gravel dryer three-drum dryer

Sand and gravel dryer three-drum dryer

Structural composition:

• Drum part:

It is composed of three concentric cylinders of different diameters nested and combined. The inner cylinder, middle cylinder and outer cylinder are reasonably combined according to certain parameters, and each plays a different role. The inner cylinder performs preliminary heat exchange and drying, the middle cylinder further enhances the drying effect, and the outer cylinder plays the role of heat preservation and auxiliary drying.

• 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 cylinder to rotate, ensuring that the material continues to roll and move in the cylinder.

• Feeding device:

responsible for conveying the sand and gravel to be dried into the dryer, and it is necessary to ensure the stability and uniformity of the feed to ensure the drying effect.

• Discharging device:

 used to discharge the dried sand and gravel, with 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, so that the sand and gravel can be evenly dispersed and turned in the cylinder, fully contact with the hot air flow, and improve the heat exchange efficiency.

• Dust removal system:

Collect and process the dust generated during the drying process to reduce pollution to the environment.

• Working principle:

The wet sand and gravel enter the inner cylinder from the feeding device, and are continuously lifted 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 sand and gravel enter the middle cylinder for countercurrent drying, and the material is repeatedly lifted in the middle cylinder to extend the drying time. Finally, the sand and gravel fall into the outer cylinder, and are further dried in the outer cylinder before being discharged from the discharging device.

Advantages and characteristics:

High efficiency and energy saving:

• High thermal efficiency:

The three-cylinder structure increases the contact area and heat exchange time between the material and the hot air flow. The heat emitted by the inner cylinder can be partially absorbed and utilized by the middle cylinder and the outer cylinder, reducing heat loss. The thermal efficiency can be increased by more than 30%-50% compared with the single-cylinder dryer, and the energy-saving effect is significant.

• Strong fuel adaptability:

It can adapt to a variety of fuels, such as coal, oil, gas, biomass pellets, etc. Enterprises can flexibly choose according to local fuel resources and costs.

Good drying effect:

• The material is evenly dried:

The unique cylinder structure and lifting plate design enable the sand and gravel to be evenly dispersed and turned in the dryer, avoiding material accumulation and uneven drying, and ensuring that the moisture content of the sand and gravel after drying is uniform and consistent. The moisture content of the dried material can reach 0.5% - 1% or less.

• High material quality:

The temperature and heat are evenly distributed during the drying process, and the sand and gravel will not deteriorate, discolor, or break due to local overheating, which well guarantees the quality of the sand and gravel.

Compact structure:

• Small footprint:

The cylinder structure of the three-cylinder dryer is compact, and the length of the cylinder is shortened by about two-thirds compared with the single-cylinder dryer. The floor area is only about half of the single-cylinder dryer with the same output, saving a lot of site space, which 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 period and reduce the installation cost.

Reliable operation:

• Small wear of equipment:

The friction between sand and gravel and the drum and lifting plate during the drying process is relatively small, which reduces the wear of the equipment and extends the service life of the equipment. In addition, 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.