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Use of vacuum dryer

The vacuum dryer is composed of a refrigeration system, a vacuum system, a heating system and an electrical instrument control system. The main components of the drying box, condenser, chiller, vacuum pump, heating / cooling devices, etc.. It is the working principle of dry goods will be frozen until the first triple point temperature, then the solid water in articles under vacuum conditions (ice) directly sublimed into water vapor, excluded from the goods, the goods dry. After the material is processed, it is sent to the quick freezing warehouse to be frozen, and then sent to the drying chamber for sublimation and dehydration. The vacuum system establishes a low pressure condition for the sublimation drying chamber, and the heating system provides the latent heat of sublimation to the material.

The equipment adopts high efficiency radiation heating, uniform heating of materials; high catching cold trap by, and can realize the fast defrosting; using high vacuum unit, and can realize the separation of oil and water; the parallel centralized refrigeration system, multi-channel cooling on demand, stable operation, good energy saving; using artificial intelligent control, high control precision, convenient operation. The quality requirements of freeze-dried products are as follows: the biological activity remains unchanged, the appearance is uniform, the shape is full, the structure is firm, the dissolution speed is fast, and the residual water is low. In order to obtain high quality products, there should be a comprehensive understanding of the theory and technology of freeze-drying.

Freeze drying vacuum drying process consists of three stages: pre freezing, sublimation and freeze-drying. Reasonable and effective shortening of the freeze drying cycle has obvious economic value in industrial production. Vacuum dryer in the sealing of the interlayer into the thermal energy (such as hot water, low pressure steam or heat conduction oil), heat inside the shell to the dry material. Under the driving force, the tank can be rotated slowly, and the material in the tank can be continuously mixed, so as to achieve the purpose of strengthening drying. The material is in a vacuum state, the atmospheric pressure drops to make the surface of the water (solvent) to saturation state and evaporation, and the vacuum pump in time.

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