| In developed countries began in the 1980s when industrialization microwave vacuum dryer developed and achieved good results in practical applications.
Vacuum Dryer is suitable for drying a small amount is not high temperature and susceptible to oxidation pulpy paste materials, vacuum rake dryer is a conduction heat transfer dryer. The material does not directly contact with the heating medium. Desiccator of the moisture content was 15% to 90% level harrow agitator blade is made from cast iron or steel, the apparatus in the square shaft, left half of the blade direction, and the other half to the right. Shaft speed of 7 ~ 8r/min the gearbox motor driven by the band. While using the automatic steering apparatus, so that the direction of rotation of the shaft, at intervals of 5 ~ 8min changed once a stirrer rotating direction.
Vacuum dryer several major advantages:
And efficient conventional vacuum dryer steam heating, heat from the inside to the outside, heated slowly takes a lot of coal, and microwave vacuum dryer using electromagnetic wave heating, no heat transfer media, direct heating to the interior of the object, heating speed, 1 kW of microwave energy within 3-5 minutes at room temperature under water heated to 80 ℃, to avoid the above disadvantages, so fast, high efficiency, greatly shorten the drying cycle, and reduce energy consumption. Compared with conventional drying technology can improve the ergonomics more than four times.
2, the uniform heating due to microwave heating, is from the inside to the outside of the material is heated at the same time, a small temperature difference between the inside and outside of the material, does not produce inconsistent condition of conventional heating in the inner and outer heating, thereby producing the effect of puffing, conducive pulverized, so that drying quality is greatly improved.
3, vacuum dryer is easy to control, to facilitate continuous production and automate the microwave power can be adjusted quickly and without inertia characteristics, easy-to-real-time control, the temperature can be adjusted between 40 ℃ -80 ℃.
4, vacuum dryer prepare volume is small, easy installation and maintenance, and do not account for much of venue.
5, good quality products, vacuum dryer to extend the shelf life of food, save the original flavor of food and nutrients, to retain the physiological activity of the raw materials, enhance the functionality of the health food and increase the value of agricultural products. Compared with conventional methods, the processing of product quality has greatly improved.
Microwave vacuum dryer with disinfection and sterilization efficacy, product safety and health. Long shelf life.
7, the significant economic benefits. Traditional drying time is very long, very slow speed, energy consumption, high processing costs. By microwave heating, you can save a lot of energy, and improve the speed of heating and drying. This is because the microwave penetrating, at the time the object is heated, and does not require any media, and may be both inside and outside of the material while heating.
According to the information at home and abroad, the use of microwave equipment heating the material, its speed and performance is 4 to 10 times of conventional heating methods. From the above-described characteristics, energy conservation, energy, and improve product quality, health and safety, and low cost of investment in equipment can be seen aspects of its economic and social benefits significantly.