Microwave is a high-frequency wave that changes at a speed of 2.4 billion times per second, causing the high-speed swing movement of water molecules, which rub against each other to produce great heat, which can easily dry the material.
After the object absorbs microwave energy and converts it into heat, the temperature of the object increases, and the water contained in the object evaporates, dehydrates and dries; If the dewatering rate is properly controlled, the structure of the object can be loosened and expanded when the material is dried. In this process, it is also possible to control and increase the heating temperature so that the object is in a baking state.
Microwave drying is different from traditional drying methods in that the direction of heat conduction is the same as that of moisture diffusion. Compared with the traditional drying method, it has the advantages of large drying rate, energy saving, high production efficiency, uniform drying, clean production, easy to realize automatic control and improve product quality, so it has attracted more and more attention in various fields of drying. As early as the 60s of the last century, a lot of research has been carried out on the application and theory of microwave drying technology abroad, and it has been further developed in recent decades.
Main application areas
Drying of viscous materials with high moisture content;
Zirconia drying, drying of powder, granular, flake, strip, plate, small blanks and other materials;
catalyst activation and regeneration;
drying, sterilization and disinfection of sludge and other solid wastes;
drying, sterilization and disinfection of food, medicine and pharmaceutical raw materials;
drying, insecticidal and anti-mildew treatment of rice and flour;
the finishing and fragrance of tea;
curing of polymer materials;
Heat treatment of foamed materials.