The working principle of microwave dryer : 

When the microwave drying equipment is running, the microwave is first generated by the microwave generator and input into the microwave heater through the energy-feeding device. The material is sent to the heater by the transmission system. At this time, the water in the guess is heated and evaporated under the action of microwave energy, and the water vapor is swept away by the dehumidification system to achieve the monotonous purpose. The bacteria were killed by the biological effect and thermal effect of microwave electromagnetic field. Because the microwave is directly acting on the material, the monotonous temperature is low, the speed is fast, and the loss of useful ingredients in the drug is very small. 

Microwave heating is a kind of radiation heating. It is a direct effect of microwave on the object, so that the surface and the inside are heated together, without the need to transfer heat through convection or conduction. Therefore, the heating speed is fast, the thermal efficiency is high, the processing time is short, and the temperature of the material surface is uniform, so as to save energy, the monotonic efficiency is high, and the monotonic quality is good. Intelligent static microwave vacuum monotonous equipment is a new type of microwave energy application equipment which combines microwave energy technology with vacuum technology, and through high-tech intelligent control. Microwave dryer combines the benefits of microwave monotonicity and vacuum monotonicity, and overcomes the defects of high temperature, long time and high energy consumption of conventional vacuum monotonicity. In the monotonic process of general materials, the monotonic temperature is 30-60 degrees Celsius, with high monotonic yield, good quality and low processing cost. Together with the intelligent control system, it can control water and other benefits. In addition, the oxygen content is low when it is monotonous at low temperature and low pressure, which is weakened and slowed down by the oxidation reaction of monotonous materials, and then ensures the flavor, appearance and color of the materials, which is easy to monotonous heat-sensitive materials. In particular, the microwave dryer has the advantages of monotonous low temperature of traditional Chinese medicine extract, beef paste, chemical raw materials and agricultural products.