The selection of the dryer is a process affected by many factors. The following will give a comprehensive but simple introduction to the various factors that affect the selection of dryer equipment.
Convection heating is usually used to dry dry granular, web-like or paste-like materials. It provides heat energy to the material when the hot gas flows through the material, and the vaporized moisture after contact will be taken away by the gas. These dry gases include air, inert gases, direct smelting gases or superheated steam.
This kind of drying equipment is also called direct (heating) drying equipment, in the initial constant velocity drying stage (at this stage the surface moisture is removed). The surface temperature of the material is the same as the wet surface temperature of the heating medium. In the deceleration drying stage, the temperature of the material will slowly approach the drying temperature of the medium. If we are drying heat-sensitive materials, we must take these factors into consideration.
When using superheated steam to dry the material, the maximum temperature of the material is the same as the saturation temperature of the operating pressure. At 0. The steam is 100°C at 1MPa. For materials that may be oxidized and sensitive to oxygen in a steam environment, product quality can be protected and improved.
Convection (direct) drying equipment includes fluidized bed, flash, drum or spray drying equipment, air impact drying equipment for paper or pulp, fixed bed or through drying equipment, belt type, trolley-tunnel drying equipment, etc.
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