Drying generally refers to various operations to remove moisture or other moisture from wet materials. For example, in daily life, wet materials are exposed to the sun to remove moisture. The traditional heating method is to heat from the outside to the inside through radiation, convection and conduction. In order to avoid excessive temperature gradient, the heating speed is often not too fast, It is also impossible to selectively heat each component of mixed materials in the same reaction device. Today, I will take you to know microwave drying Advantages compared with traditional drying.

microwave drying

　　1、 microwave heating When the sample is heated evenly, the temperature gradient is small. In the traditional heating process, the heat is transferred from the surface of the sample to the interior. Because the surface temperature is higher than the center temperature, a large temperature gradient will be generated, which may lead to uneven submicrostructure and performance. Microwave heating is generated inside the heated object, and the heat source is from the interior of the object, The heating is even. At the same time, because of the "simultaneous heating inside and outside", the heating time is greatly shortened, and the heating efficiency is high, which is conducive to improving product output. In addition, the inertia of microwave heating is very small, which can realize rapid control of temperature rise and fall, and is conducive to automatic control in continuous production.

2. Microwave has the characteristic of selective heating of substances. Since the ability of substances to absorb microwave energy depends on their own dielectric properties, they can selectively heat each component in the mixed materials. By using selective heating, the gas phase temperature will not be too high, thus improving the selectivity of the reaction.

3. Microwave heating can quickly control the reaction temperature. Traditional drying methods, such as steam heating, electric heating, infrared heating, etc., take a certain time to reach a certain temperature. In case of failure or stop of heating, the temperature drops for a long time. Microwave heating has no hysteresis effect. When the microwave source is turned off, no microwave energy is transferred to the material, This characteristic can be used to respond to high requirements for temperature control.

4. Microwave heating has strong penetration ability, high energy utilization efficiency, and material temperature rises very quickly. Proper application can speed up the processing of materials, but it will also cause adverse effects if not well controlled.

5. Microwave heating environment is clean, sanitary and pollution-free Microwave drying equipment Compared with the traditional drying equipment, it occupies a smaller area and avoids high ambient temperature. The working environment of workers has been greatly improved.

Microwave high temperature

Microwave drying equipment Unique features of heating

Microwave technology can be used independently in the drying process, or it can be combined with traditional heating method. An example of microwave drying of food is potato chips, which are fried with hot oil to form a unique color, and then dried with microwave and hot air at the same time Microwave drying The uniqueness of equipment heating is as follows:

1. It can be heated deep into food, so it can be heated quickly;

2. Clean heating mode, the environment is not polluted, and it is easy to clean the furnace after heating;  

3. Different processing technologies can be selected, for example, the food in the container or package can be heated. In addition, the food can be dried evenly;  

4. Easy to control heating temperature and realize automation;  

5. Heating has sterilization effect at the same time.