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With the development of the situation, the market of microwave drying equipment has developed rapidly, and the production enterprises have also made good achievements, innovations in technology and increasing benefits. In fact, drying has a long history, as early as ancient times, people began to use natural conditions for material drying. With the development of the times, they are gradually replaced by manual operation. Instead, microwave drying equipment has gradually developed.
Principle of microwave drying equipment:
The microwave of microwave drying equipment is a kind of electromagnetic wave with very short wavelength, whose wavelength is between 1 m m and 1 m, and its corresponding frequency is between 300 GHz and 300 MHz. In order to prevent the interference of microwave to radio communication, broadcasting and radar, there are four frequencies for microwave heating and microwave drying, which are L-band, frequency 890-940 MHz, wavelength 330 mm; S-band, frequency 2400-2500 MHz, wavelength 122 mm; C-band, frequency 5725-5875 MHz, wavelength 52 mm; K-band, frequency 2200-22250MHz, wavelength 8 mm. Only L and S segments are used in domestic microwave ovens.
Characteristics of Microwave Drying Equipment ：Energy Saving of Microwave Drying Equipment.Because the substance containing water is easy to absorb microwave and heat, there is almost no other loss except a small amount of transmission loss. Therefore, it has high thermal efficiency and energy saving. Microwave drying equipment can save more than 1/3 energy than infrared drying. Microwave drying equipment dries rapidly.Microwave drying equipment is completely different from traditional drying methods. It is a process in which the dried material itself becomes a heater without heat conduction.Microwave drying equipment dries evenly. Regardless of the shape of each part of the object, the microwave drying equipment can make the surface of the object penetrate electromagnetic wave uniformly at the same time and generate heat energy. Therefore, the microwave drying equipment has good drying uniformity and will not produce endogenous phenomenon of coke.Safety and harmlessness.Because microwave energy of microwave drying equipment is controlled to work in metal drying chamber and waveguide tube, microwave leakage is very little, there is no radiation hazard and harmful gas emission, no waste heat and dust pollution, neither food pollution, microwave drying equipment nor environmental pollution.
The stronger the applied electric field is, the stronger the polarization effect of microwave drying equipment will be. The faster the polarization of the applied electric field changes, the faster the polarization will be. The more intense the thermal movement of molecules in microwave drying equipment and the friction between adjacent molecules will be. In this process, the conversion of electromagnetic energy to thermal energy is completed. When the heated material is placed in the microwave field, the polar molecules of microwave drying equipment swing and rub back and forth with the microwave frequency of billions of times per second. The heat generated by microwave drying equipment is enough to make the material hot-dry in a very short time.
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