Product
| How much do you know about drying equipment commonly used in chemical plants! |
| Drying equipment classification 1Press the operating pressure The dryer is divided into two types: atmospheric dryer and vacuum dryer. Operating under vacuum can reduce the partial pressure of moisture and steam in the space to accelerate the drying process, and can reduce the boiling point of moisture and the drying temperature of materials, and the steam is not easy to leak, so , Vacuum dryer is suitable for drying heat sensitive, easily oxidized, explosive and toxic materials and occasions where moisture vapor needs to be recovered. 2 by heating method Dryers are divided into convection, conduction, radiation, dielectric and other types. Convection dryer, also known as direct dryer, uses hot drying medium to directly contact wet materials, transfer heat by convection, and take away the generated steam; Conductive dryer is also called indirect dryer. It transfers heat from the heat source to the wet material through the metal partition wall by means of conduction. The generated moisture vapor can be pumped under reduced pressure, a small amount of purge gas can be introduced, or it can be condensed at a separate low temperature. The surface of the device is condensed, etc. to remove it. This type of dryer does not use drying medium, has high thermal efficiency, and the product is not contaminated, but the drying capacity is limited by the heat transfer area of the metal wall, the structure is also more complicated, and it is often operated under vacuum; Radiation dryers use various radiators to emit electromagnetic waves in a certain wavelength range, which are selectively absorbed by the surface of the wet material and converted into heat for drying; The dielectric dryer uses high-frequency electric field to dry the wet material by the thermal effect. |
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