In fact, as with other drying methods, vacuum freeze-drying is required to maintain the constant progress of sublimation and drying, and two basic conditions must be met, namely the continuous supply of heat and the continuous elimination of generated steam.
In the initial stage, if the material temperature is relatively high, the latent heat required for sublimation can be taken from the sensible heat of the material itself. However, with the progress of sublimation, the temperature of the material quickly falls to a temperature that is in equilibrium with the partial pressure of the steam in the drying chamber. At this time, if there is no external heating, sublimation drying stops. In the case of external heating, if the steam generated by sublimation is not eliminated in time, the partial pressure of steam will increase and the temperature of the material will increase. When the frozen point of the material is reached, the ice crystals in the material will melt. Freeze-drying can not be carried out.
Vacuum freeze-drying has many kinds of heating methods, such as contact heat transfer method, double heating method, microwave heating method, etc. Each heating method has its own characteristics. Based on the constant understanding of the essence of the freeze-drying process, people have explored a variety of heating and radiation combinations, such as conduction-radiation heating, conduction-microwave heating, and radiation-microwave heating. Its purpose is to expect to increase the drying rate and reduce energy consumption while ensuring product quality.
At this stage, with the continuous advancement of the environmental protection industry, freeze-drying equipment also needs to be closer to energy conservation and environmental protection. The advantage of vacuum freeze-drying is precisely that it can reduce the possibility of oxidative deterioration of materials and eliminate bacteria in materials. Therefore, related companies must make good use of this advantage, follow the trend of development and continue to promote the development of the drying industry.
Compared with other crushers, the single shaft crusher has a larger crushing chamber. Widely used in wood chips, straw, straw and other fiber materials crushing.
The motor and rotor are installed in the same heavy-duty base, using coupling direct drive, rotor passes accurate dynamic balancing test, the hammers are arranged symmetrically.
Unique Feeding Design, the feeding inlet is made on the top of the machine to make feeding easily.
The shell is welded by steel plate, the site in the crush room which connects to the materials all use the wearable and commutative parts and double wear plate.
Hammers adopts special abrasion resistent treatment technology, extend its lifetime greatly.
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