1. Low temperature and high efficiency: It is known that the gas pressure is lowered and the boiling point of water is lowered. For example, at one atmosphere (101.3 kPa), the boiling point of water is 100 ° C, and at 0.073 atm, the boiling point of water is 40 ° C. Under vacuum conditions, heating the object allows the internal moisture of the object to evaporate without temperature rise. Microwave vacuum drying of heat sensitive materials, the drying speed is also much higher than conventional drying, the ratio is generally more than ten or even dozens.
2.Uniform and thorough: the part with high water content, the absorption of more microwaves, the heat generated, and vice versa; at the same time the product is internal and external heating, no thermal inertia, no heat transfer loss, fast drying speed. Microwave directly penetrates the product, intensifies the water molecules, generates heat, and the internal temperature is slightly higher than the external temperature. It can avoid the temperature gradient and produce the "shell" and the evaporation of water is slow.
3. Simple control: Due to the rapid adjustment of microwave power and the characteristics of no inertia, combined with PLC automatic control system for timely control, it is convenient to adjust and determine the process parameters.
4.Improve the quality: drying in a low temperature and oxygen-free environment, more to ensure product quality.
5.To maintain the original color: due to the short drying time of the microwave, the traditional drying time is long, the humidity is easy to cause the product to change color, especially for valuable herbs (Chongcao, ginseng), Chinese herbal extracts (extract), seafood products (sea cucumber), etc. Is an ideal drying method.
6. Energy-saving and environmental protection: Compared with the conventional electric heating drying method, microwave drying can generally save 50% of electricity. The equipment uses microwave radiation energy transmission, which is the overall heating of the medium, without other heat transfer medium, avoiding heat conduction under vacuum conditions. The shortcomings of slowness. Therefore, the speed is fast, the efficiency is high, the drying cycle is greatly shortened, and the energy consumption is reduced. No noise, no toxic gas emissions, no toxic liquid emissions, is an environmentally friendly drying technology.