Triple-drum dryer

Product Advantages

Telescopic three-drum dryers are primarily used for drying granular materials within a certain moisture and particle size range. These include yellow sand used in the dry-mix mortar industry, various molding sands used in the foundry industry, blast furnace slag used in the building materials and cement industry, small-grained clay, and small-particle materials used in the chemical industry that are chemically stable and resistant to high temperatures and dust. Depending on the final moisture requirements of different industries, the moisture content of the dried materials can be reduced to below 1-0.5%.

Materials entering the dryer should not adhere to the drum walls or the lift plate. The temperature of the heat exchange gas entering the dryer should not exceed 750°C. If high-temperature drying is required, the inner drum and lift plate at the dryer entrance can be constructed of heat-resistant steel.

Telescopic three-drum dryers feature a compact structure and a small footprint, requiring only half the space of a single-drum dryer of the same output. They also offer reliable operation, low energy consumption, and high thermal efficiency. They offer excellent drying results, are easily automated, and require minimal operator intervention.

Working Principle
The drying process of a telescopic three-drum dryer is as follows: the material to be dried is fed into the dryer's inner drum at the feed end. The material enters the inner drum through the spiral guide plate inside the drum, which is equipped with numerous spiral lifting plates. As the drum rotates, the material is continuously lifted and moved longitudinally by the lifting plates. Upon reaching the left end of the inner drum, the material falls into the middle drum under its own weight. Passing the guide plates, the drum's rotation pushes the material back into the middle drum. The lifting plates in the middle drum move the material rightward until it reaches the right end of the middle drum, where it falls under its own weight into the outer drum. Similarly, the spiral lifting plates in the outer drum deflect the material and move it leftward until it reaches the left end of the outer drum. The guide plates then drop the material into the discharge drum. The three concentric drums (1, 2, and 3) of the dryer body are equipped with varying numbers and angles of curved spiral lifting plates. Guide plates are located at the ends of each drum. The main body of the telescopic three-drum dryer is driven by two reduction motors 6, each driving two drive rollers 5 at each end, causing the belt 4 to rotate around its center. When the wet material is fed into the inlet of the inner drum 3 via the feeder (the inlet pipe), it is rapidly pushed toward the spiral lifting plate by a spiral guide plate. As the drum rotates, the material is lifted by the spiral lifting plate inside the drum, continuously tumbling, scattering, and moving longitudinally toward the discharge end. Simultaneously, hot air from the hot blast furnace enters the inner drum 3, the middle drum 2, and the outer drum 1, successively, undergoing intense heat exchange with the material. Because the metal steel plate conducts heat faster than the material being dried, the steel plate and the lifting plate are heated first. This heat is then transferred to the material through conduction and radiation. The heated material temperature rises. When the temperature reaches a point where water evaporates, the water vapor separates from the material and, along with the smoke, passes through a dust collector and is discharged into the atmosphere, thus achieving the desired drying effect.

Technical Specifications