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The three return sand dryer is a new type of drying equipment in recent years. Compared with the single cylinder drying device, the three return sand dryer not only greatly reduces the volume, but also adopts the way of three cylinders nested each other, which greatly improves the thermal insulation performance of the cylinder, with less heat loss and higher thermal efficiency, which is conducive to the production effect of energy saving and low consumption. So, which materials can the three return sand dryer dry and which industries can it be applied to?
Three return sand dryer is also called three drum dryer. When it dehydrates and dries the materials, it first sends the materials into the inner layer of the drum by the feeding device to dry them smoothly. In this process, the material realizes the heat exchange under the action of the inner cylinder plate, and moves in a spiral way. At the other end of the inner cylinder, the material enters the middle layer, where it is dried in a countercurrent manner. In the middle cylinder, the material is in the way of two steps forward and one step backward, which can fully absorb the heat in the middle cylinder and the heat emitted by the inner cylinder. It can be said that good heat and mass transfer effect is achieved in this process. Then it enters the outer shell for multi-mode heat transfer, and is discharged from the discharge end after drying to the qualified level.
Due to the complex structure of the three pass sand dryer, it requires higher process accuracy when drying wet materials. If the materials with higher viscosity and moisture content are dried, it is easy to stick to the wall, which brings great inconvenience to the maintenance of the equipment. Therefore, under normal circumstances, the three pass sand dryer has better drying efficiency and effect for powdery and granular materials with low moisture content and viscosity. For example, it plays an important role in drying all kinds of artificial sand, river sand, sea sand and other materials.
Therefore, to say that the three return sand dryer is widely used in the sand production line. As an important part of sand material processing production line, three pass sand dryer plays an irreplaceable role in both manual sand making and natural sand drying. In addition, in the operation of ore and coal processing, the three return sand dryer can also be used for the drying production of some low moisture, low viscosity pulverized coal, slag, mineral powder and other materials. The three return sand dryer is also a very important part in the processing of some mixed materials, the production of dry mixed mortar in the construction industry, and the drying of raw materials in the chemical industry and foundry industry.