Equipment used for drying operations. There are many types. According to the operating pressure, it can be divided into normal pressure and reduced pressure (a vacuum dryer is also called a vacuum dryer). According to the operation method, it can be divided into batch type and continuous type. According to the drying medium, it can be divided into air, flue gas or other drying medium. According to the movement (material movement and drying medium flow), it can be divided into cocurrent, countercurrent and crossflow. Press operating pressure
According to the operating pressure, the dryer is divided into two types: atmospheric pressure dryer and vacuum dryer. The operation under vacuum can reduce the moisture partial pressure of space and accelerate the drying process, and can reduce the boiling point of the wet water and the drying temperature of the material. Leakage, therefore, the vacuum dryer is suitable for drying heat sensitive, oxidizable, explosive and toxic materials and wet steam needs to be recycled.
According to the heating method, the dryer is divided into a convection type, a conduction type, a radiation type, a dielectric type and the like. The convection dryer, also known as the direct dryer, uses a hot drying medium to directly contact the wet material to transfer heat in a convective manner and to carry away the generated steam. The conductive dryer is also called an indirect dryer, which utilizes conduction. The heat is transferred from the heat source to the wet material through the metal partition wall, and the generated wet steam can be removed by vacuum suction, a small amount of purge gas or condensation on the surface of the separately provided low temperature condenser. This type of dryer does not use drying medium, has high thermal efficiency, and the product is not polluted, but the drying capacity is limited by the heat transfer area of ​​the metal wall, the structure is also complicated, and it is often operated under vacuum; the radiant dryer uses various radiations. The electromagnetic wave emitted by a certain wavelength range is selectively absorbed by the surface of the wet material and then converted into heat for drying; the dielectric dryer uses a high-frequency electric field to cause a thermal effect inside the wet material to be dried. According to the way of moving wet materials
According to the movement mode of wet materials, the dryer can be divided into fixed bed type, agitated type, spray type and combined type; according to the structure, the dryer can be divided into a box dryer, a conveyor dryer, a drum dryer, and a stand. Dryers, mechanically agitated dryers, rotary dryers, fluidized bed dryers, airflow dryers, vibrating dryers, spray dryers, and combined dryers.
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