Microwave drying is a new type of drying method. The principle is: When drying, microwave energy directly acts on the heating material to make the polar molecules inside move vigorously, generating heat energy to evaporate water molecules, so the heating speed is very fast, and the drying speed can be shortened for materials with water content below 30% Hundreds of times. As early as the 1960s, a large number of studies on the application and theory of microwave drying technology were conducted abroad, and good results have been achieved in practical applications. Let me introduce to you the five advantages of microwave drying:
1 Conventional drying equipment mostly uses steam heating, which requires heating from the outside to the inside. Slow heating speed needs to consume a lot of energy. Microwave drying uses electromagnetic waves to make the heated object itself a heating element, and does not require heat conduction. Therefore, the speed is high, the efficiency is high, the drying cycle is greatly shortened, and the energy consumption is reduced. Even materials with poor thermal conductivity can be heated quickly.
2 The microwave drying heating is uniform, regardless of the shape of the material, the inside and outside are heated uniformly under the action of electromagnetic waves, without the phenomenon of external coke endogenesis caused by the inconsistent heating of the inside and outside of the material in conventional heating, and the drying quality is improved.
3 Microwave drying directly acts on the heating material, and there is no heat conduction to reduce the transmission loss. It saves more than 1/3 energy than infrared heating and more than 1/2 energy saving than steam heating. Moreover, the whole heating process is inside the equipment, and the microwave leaks very little, and there is no radiation hazard in the process. And toxic gas emissions, no waste heat and dust, so microwave drying has the advantages of energy saving, high efficiency and pollution-free.
4 microwave drying has a small equipment space, easy to control, convenient for continuous production and automation, can realize immediate heating and stop, and easy to control and adjust the temperature in real time.
5 Microwave has the function of anti-mildew, sterilization and fresh-keeping. Through the thermal and biological effects of microwave heating, it can be sterilized and anti-mildew at a lower temperature, which can extend the shelf life of food, preserve the original color and nutrient content of the food, and preserve the raw materials. Physiological activity, enhance the functionality of health foods, and increase the added value of agricultural products. Compared with traditional methods, the quality of processed products has been greatly improved.
It is precisely because of these advantages that microwave drying is widely used in food processing, material chemical industry, pharmaceutical processing, pet feed drying, tea and medicinal processing, condiment processing, grain storage, nut processing, wood and bamboo products, and fast food industries. With meat products, fish and shrimp cooked and other aspects.
