Microwave vacuum drying is a kind of high-frequency wave of radiation heating, which is the direct effect of microwave on the object, so that the inside and outside of the object are heated at the same time, without convection or conduction to transfer heat, at a rate of 2.4 billion times per second, resulting in the high-speed wheel motion of water molecules, which generate a great deal of heat through mutual friction, so it is convenient to dry materials.
Therefore, microwave vacuum drying equipment saves energy, has high drying efficiency and good drying quality.
What is the purpose of vacuum drying?
The purpose of drying is to remove water or solvent from some raw materials, semi-finished products and finished products, so as to facilitate processing, use, transportation and storage.
Advantages of industrial microwave vacuum dryer:
- The heat distribution is uniform.
- It has the effect of disinfection and sterilization.
- Economic energy consumption and high degree of automation.
- low temperature and high efficiency, fast drying speed.
- Temperature control is easy.
- Low processing cost.
Microwave vacuum drying technology and industrial microwave vacuum dryer have been widely used in light industry, chemical material industry, food and agricultural products processing industry and other industries, showing significant advantages.
Application scope of industrial microwave vacuum dryer:
|Fruits and vegetables||Apples, bananas, carrots, mushrooms, etc|
|Foods||Fruit chips, vegetable chips, agricultural products, health products, etc|
|Meat products||Steak, mutton, poultry, etc|
|Herbs||Sophora flavescens, ramulus cinnamomi, mulberry leaves, etc|
|Chemical raw materials||Clay material, aluminum oxide, manganese sulfate, etc|
|Microwave working frequency||2450MHZ±50HZ|
|Drying temperature||80-120℃（adjustable and controllable）|
|Height of inlet and outlet||60mm|
|Transmission speed||0-5m/min（frequency control）|
Industrial microwave vacuum dryer system is mainly composed of vacuum dryer, condenser, dust remover, vacuum extraction system, heating system, cooling system, electric control system, etc.
Microwave vacuum drying is different from the traditional drying method, its heat conduction direction is the same as the water diffusion direction.
Difference between traditional drying method and microwave vacuum drying method:
Atmospheric pressure drying: Commonly used box dryer (oven or drying room), drying time is long, may cause damage of non heat resistant components due to overheating, easy to agglomerate.
Freeze drying: In the process of low temperature dehydration, some microorganisms are difficult to be purified, bacteria and pathogens resistant to low temperature can be retained in the product; in addition, the cost of freeze drying is very high.
Decompression drying: Drying under decompression and low temperature, cumbersome process, long operation cycle, dry materials in the process of taking out, will quickly absorb moisture in the air.
Microwave vacuum drying:
Comprehensive comparison, in the traditional heating mode, heat is carried out by convection, conduction and radiation, and permeates from the outside to the inside. However, it is difficult to carry out heat transfer by air convection under vacuum conditions. Only by means of heat conduction and radiation can heat materials. The surface temperature of heated materials is high, the internal temperature is low, and the internal and external temperature difference is large, so the temperature is difficult to control.
Therefore, the conventional drying method has the advantages of slow heat conduction speed, high energy consumption, low efficiency and long drying time. Microwave vacuum drying has the advantages of fast speed, high efficiency, short drying cycle, low energy consumption, and has the efficacy of disinfection and sterilization, so that the product is safe and healthy, and the shelf life is long.
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