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What is the working principle of centrifugal scraper film evaporator
source：www.sjbyj.com Release time：2026-04-14
The core of a centrifugal scraper film evaporator is high-speed rotation, film scraping, and centrifugal force, which allows the material to form an extremely thin flowing liquid film on the heating surface, achieving fast, low-temperature, and efficient evaporation.
1. Basic structure
High speed rotating hollow rotor (heating cylinder)
Install scraper/material tray inside the cylinder
External jacket heated by steam/thermal oil
Top feeding, bottom discharging, upper vacuuming, and secondary steam discharge
2. Workflow
feeding
The material enters the rotating rotor from the top and is evenly thrown towards the inner wall of the heating cylinder by the feeding tray.
Film formation (key)
The high-speed rotation of the rotor generates strong centrifugal force, and the material is tightly pressed against the heating surface;
At the same time, the scraper continuously scrapes and updates the liquid film, forming an extremely thin, uniform, and turbulent film.
Heating and evaporation
The liquid film is extremely thin, the heat transfer is extremely fast, and the material stays on the heating surface for a very short time (several seconds to ten seconds),
Quickly vaporizes under low temperature in vacuum, and the solvent becomes secondary vapor that is extracted.
discharge
The concentrated material flows downwards under centrifugal force and is discharged from the bottom outlet.
3. Core features (advantages brought by principles)
Extremely short residence time: suitable for heat sensitive materials (Chinese medicine, essence, vitamins, chemicals)
High heat transfer efficiency: thin liquid film, continuous renewal, less prone to scaling and coking
It can handle materials with high viscosity, easy crystallization and easy foaming: scraper can destroy foam and scrape away scale
Vacuum low-temperature evaporation: protecting the effective components of materials from being destroyed
4. Typical applications
Concentrate traditional Chinese medicine extract
Concentrate pharmaceutical and biological products
High viscosity resin, latex concentration
Easy to foam and scale wastewater/material evaporation
1. Basic structure
High speed rotating hollow rotor (heating cylinder)
Install scraper/material tray inside the cylinder
External jacket heated by steam/thermal oil
Top feeding, bottom discharging, upper vacuuming, and secondary steam discharge
2. Workflow
feeding
The material enters the rotating rotor from the top and is evenly thrown towards the inner wall of the heating cylinder by the feeding tray.
Film formation (key)
The high-speed rotation of the rotor generates strong centrifugal force, and the material is tightly pressed against the heating surface;
At the same time, the scraper continuously scrapes and updates the liquid film, forming an extremely thin, uniform, and turbulent film.
Heating and evaporation
The liquid film is extremely thin, the heat transfer is extremely fast, and the material stays on the heating surface for a very short time (several seconds to ten seconds),
Quickly vaporizes under low temperature in vacuum, and the solvent becomes secondary vapor that is extracted.
discharge
The concentrated material flows downwards under centrifugal force and is discharged from the bottom outlet.
3. Core features (advantages brought by principles)
Extremely short residence time: suitable for heat sensitive materials (Chinese medicine, essence, vitamins, chemicals)
High heat transfer efficiency: thin liquid film, continuous renewal, less prone to scaling and coking
It can handle materials with high viscosity, easy crystallization and easy foaming: scraper can destroy foam and scrape away scale
Vacuum low-temperature evaporation: protecting the effective components of materials from being destroyed
4. Typical applications
Concentrate traditional Chinese medicine extract
Concentrate pharmaceutical and biological products
High viscosity resin, latex concentration
Easy to foam and scale wastewater/material evaporation
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