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Shanghai Yuming Instrument Co., Ltd
Technological principle of experimental freezing spray dryer
Date: 2025-08-14Read: 5
Freezing spray dryer combines spray atomization and freeze drying technology to achieve efficient dehydration of materials. The process principle includes the following key steps:
1. Material atomization stage: The liquid material is dispersed into fine droplets through a high-speed rotating centrifugal atomizer, enhancing the surface area to accelerate the subsequent drying process.
2. Rapid freezing stage: The droplets are instantly cooled in a low-temperature environment, forming a uniform ice crystal structure to prevent liquid water from damaging the material composition.
3. Sublimation drying stage: Under vacuum conditions (pressure 10-30 Pa), maintain a temperature of minus 40 to 0 degrees Celsius to directly sublime ice into water vapor, removing over 95% of free water.
4. Analysis of drying stage: Heat up to 20-40 degrees Celsius and increase the vacuum degree (below 5 Pa) to remove residual bound water, ultimately reducing the water content to 0.5% -4%.
The core components of the system include the refrigeration cycle unit (compressor, condenser, evaporator) to provide a low-temperature environment, and the heat exchanger to optimize energy transfer.
The entire process operates under low-temperature vacuum to ensure the integrity of material structure and preservation of activity.
