In addition to the common conventional heating methods based on conduction, convection or infrared radiation, microwave drying is an attractive solution to many industrial technical problems. "Microwave" refers to electromagnetic waves with a frequency range of 300 MHz-300 GHz and a wavelength of 1 m-1 mm. The heat of microwave drying is generated by directly converting electrical energy into the energy of molecular motion, which can achieve deep drying within the material structure.
Compared with the traditional drying method of heat conduction heating from outside to inside, microwave drying has the following advantages:
1. Compared with the traditional drying method, the drying time of microwave drying can be shortened by 25-90%, the drying speed can be increased by 4-8 times, the drying speed is fast, and the drying efficiency is high
2. Non-heat conduction drying can make the raw materials with low thermal conductivity dry quickly and fully
3. The power and temperature of microwave drying can be adjusted within a certain range, and the degree of automation is high
4. The overall energy utilization rate is high
5. Microwave drying can reduce the hardening of the surface of the raw materials and keep the permeability of the product
6. Microwave dried food has better aroma and color retention
7. Microwave drying can be widely used in food, medicine, chemical industry, materials, etc.
