The selection of drying equipment is a process that is influenced by many factors. The following will be a comprehensive and simple introduction to the factors affecting the selection of drying equipment.

Convection heating is usually used in the drying of particles, a piece of paste or paste. The materials are provided heat by the hot air. Evaporation of water will be taken away by gas. These dry gases include air, inert gas, direct combustion gas or superheated steam.

This drying device is called direct (heating) drying equipment. At the initial constant rate drying stage (the surface moisture is excluded at this stage). The surface temperature of the material is the same as the temperature of the heating medium. During the drying stage, the temperature of the material will be close to the drying temperature of the medium. When the dry heat sensitive materials, we will need to consider these factors.

When using superheated steam drying material, the maximum temperature of the material and the operating pressure saturation temperature are the same. At atmospheric pressure 0.1MPa, the steam is 100℃. In the steam environment, the product quality can be protected and improved for the easy oxidation of the material.

There are many kinds of convective drying equipment， such as fluidized bed drying, flash drying, drum and spray drying equipment etc.

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