How to apply microwave drying equipment technology

Microwave is a kind of high frequency electromagnetic wave with the frequency of 300MHz ~ 300MHz and the wavelength of 1mm ~ 1m. The microwave drying equipment has the characteristics of short oscillation period, strong penetration ability and specific effect caused by interaction with substances.

Traditional drying methods, such as flame, hot air, steam, electric heating, etc. All of them are dried by external heating. After the material surface absorbs heat, the heat penetrates into the material through heat conduction, and then is heated and dried. Microwave drying is totally different. It is an internal heating method. Wet matter is in the microwave high-frequency electric field with very short oscillation period, and its internal water molecules will be polarized along the direction of the microwave electric field, and then rotate rapidly with the direction of the high-frequency alternating electric field, resulting in severe collision and friction (up to hundreds of millions of times per second). As a result, part of the microwave energy is converted into molecular motion energy, which is expressed in the form of heat, causing the temperature of water to rise and leave the material, thus drying the material. That is to say, after the microwave enters the material and is absorbed, its energy is converted into heat energy in the dielectric of the material. Therefore, microwave drying is a drying method which uses electromagnetic wave as heating source and takes the dried material itself as heating element. Microwave drying equipment

The core of microwave drying equipment is microwave generator. At present, the main frequency of microwave drying is 2450MHz, which is mostly used in chemical industry, food, agricultural and sideline products, wood, building materials, paper products and other industries. It can also be used for sterilization of food and agricultural and sideline products.

In the traditional drying process, in order to improve the drying speed, we need to increase the external temperature and increase the temperature gradient, but it is easy to produce the phenomenon of endogenous coke. However, when microwave heating is used, no matter what shape the material is, the heat can permeate evenly, resulting in expansion effect, which is conducive to crushing.

Under the effect of microwave drying equipment, the drying rate of materials tends to be consistent and the heating is uniform. In addition, microwave drying technology does not affect the color, aroma, taste and organizational structure of the dried products, and the effective components are not easy to decompose and destroy. Relevant research institutions began to use microwave drying instead of traditional drying chamber to solve the problem of uneven drying of Sichuan Traditional Chinese medicine.

Microwave drying equipment has less supporting facilities, less land occupation, convenient operation, continuous operation, automatic production, enterprise management (PLC programmable control, temperature adjustable).