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Principle and function of dryer

Issuing time:2017-11-10 13:37

Dryer is a kind of mechanical equipment which uses heat energy to reduce the moisture content of materials, and is used for drying objects. The dryer vaporizes the moisture in the material (usually water or other volatile liquid components) by heating so as to obtain the solid material with the specified moisture content. The purpose of drying is for the use of materials or further processing. Such as wood in the production of wood, wood before drying can prevent the deformation of product, ceramic blank in the dry before calcination can prevent finished cracking. In addition, the dried material is also easy to transport and storage, such as the harvested grain dried to a certain moisture content below, to mildew change. Due to the natural drying can not meet the needs of the development of production, all kinds of mechanized dryers are more and more widely used.

Drying process requires a large amount of heat energy. In order to save energy, some high wet content materials, suspensions or solutions containing solid substances are usually mechanically dehydrated or heated to evaporate, and then dried in the dryer to obtain dry solids.

In the drying process, the heat and mass (wet) transfer should be completed at the same time to ensure that the moisture content of the wet surface of the material is higher than the wet steam partial pressure in the external space, so as to ensure the heat source temperature is higher than the material temperature.

The heat from the heat source in a variety of ways to wet materials, the material surface moisture vaporization and escape into outer space, thus the moisture content difference in the material surface and internal. Internal moisture diffusion and vaporization to the surface, so that the moisture content of the material continues to decline, and gradually complete the drying of the whole material.

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