Main characteristics of vacuum drying in vacuum system

Vacuum system is widely used in the process of vacuum drying. At present, the equipment of vacuum drying is constantly updated with the development of modern mechanical manufacturing technology and electrical technology. The so-called vacuum drying is a kind of drying method that puts the material under the negative pressure condition and reaches the boiling point under the negative pressure condition by heating properly or makes the material solidify through the melting point after cooling. Under the condition of negative pressure, the boiling point of the water in the material decreases with the increase of vacuum degree. At the same time, the water vapor content is reduced by the vacuum pump clearance, which makes the water and other solutions in the material obtain enough kinetic energy to separate from the material surface. In vacuum drying, some materials which are easy to oxidize and other chemical changes in the drying process can keep their original characteristics better because they are isolated from air under negative pressure, and the materials can also be better protected by vacuum pumping after injecting inert gas. Common vacuum drying equipment include: vacuum drying oven, continuous vacuum drying equipment, etc.

The process of vacuum drying is to place the dried materials in a closed drying chamber, vacuum the dried materials with a vacuum system and heat them continuously, so that the water inside the materials diffuses to the surface through the pressure difference or concentration difference, and the water molecules obtain enough kinetic energy on the surface of the materials. After overcoming the mutual attraction between the molecules, they escape to the low-pressure space of the vacuum chamber, so as to be true The process of pumping.

The vacuum dryer consists of a drying cabinet, a condenser and a condensate collector, and a vacuum pump. Put the wet materials in the shallow plate and put them on the shelf of the drying cabinet. The heating steam is introduced by the steam population into the sandwich shelf. The lower outlet of the condensate white drying box flows out to the condensate collector through the condensate pipe. The condensate system is closely connected with the valve and the vacuum pump through the pipe to form a complete airtight system, so that the drying operation can be carried out continuously.

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