Vacuum freeze dryer is a kind of equipment that can dry wet materials under low temperature and vacuum conditions. It is suitable for dehydration and drying of materials with high moisture content, such as food and chemical raw materials.

Features of vacuum freeze dryer:

(1) High vacuum: because the vacuum pump is used to pump the system into low air pressure, its working pressure is low;

(2) Low temperature: since the temperature of the cooled medium is lower than 0 ° C, thermal deformation and oxidation will not occur; At the same time, the decomposition reaction easy to occur at high temperature will not occur;

(3) Small heat transfer coefficient: the heat transfer coefficient is small because the evaporation latent heat of the cooled object is large at low temperature (about 1/10 of that at normal temperature); In addition, the slow diffusion speed of gas molecules makes it less heat transfer.

(4) The shelf life of articles can be extended: when the articles are in a low temperature state, the activity of water molecules decreases and it is easy to absorb the dust in the air and the growth and reproduction of microorganisms, thus extending the shelf life of articles.

(5) Energy saving: the energy consumption is greatly reduced due to the use of low-temperature heating method to make air as the heat conduction medium;

(6) It is convenient for automatic operation and control;

(7) It is easy to realize aseptic production.

ARTICLE SOURCE: XINZHIDONGGAN