Classification of drying equipment
There are many types of drying equipment. According to the operating pressure can be divided into atmospheric pressure and vacuum (vacuum drying equipment, also known as drying equipment). According to the operation method can be divided into intermittent and continuous. According to the drying medium can be divided into air, flue gas or other drying medium. According to the movement (material movement and drying medium flow) way can be divided into parallel, countercurrent and cross flow.
 
Press the operating pressure
According to the operating pressure, drying equipment is divided into two types of atmospheric drying equipment and vacuum drying equipment,
In the vacuum operation can reduce the space of the moisture partial pressure and accelerate the drying process, and can reduce the wet boiling point and the material drying temperature, the steam is not easy to leak, so the vacuum dryer for dry heat, easy oxidation, Toxic materials and wet steam need to be recycled.
 
By heating
By heating, drying equipment is divided into convection, conduction, radiation, dielectric and other types. Convection drying equipment, also known as direct drying equipment, is the use of hot dry media and wet material in direct contact with the convection way to transfer heat, and the generated steam away; Conductive dryer also known as indirect dryer, which uses conduction The heat is transferred from the heat source through the metal wall to the wet material, and the resulting wet steam can be removed by means of reduced pressure suction, passing a small amount of purge gas or condensing it on a separately provided low temperature condenser surface. This type of drying equipment does not use the drying medium, the thermal efficiency is high, the product is not contaminated, but the drying capacity by the metal wall heat transfer area limit, the structure is also more complex, often in vacuum operation; radiation drying equipment is the use of various radiation The electromagnetic field of the wet material is selectively absorbed and converted into heat for drying. The dielectric drying device uses the high frequency electric field to dry the inside of the wet material.
 
According to the movement of wet material
According to the movement of wet material, drying equipment can be divided into fixed bed, stirring, spray and combination; according to the structure, drying equipment can be divided into van drying equipment, conveyor drying equipment, drum drying equipment, legislation Drying equipment, mechanical drying equipment, rotary drying equipment, fluidized bed drying equipment, air drying equipment, vibration drying equipment, spray drying equipment and combined drying equipment and so on.