Screw Evaporator

Screw Evaporator Working Principle
The scraper evaporator shell is equipped with a heating steam jacket inside, which contains rotatable blades, or scrapers. The scrapers come in fixed and rotor types; the former has a gap of 0.5 to 1.5mm with the inner wall of the shell, while the latter's gap varies with the rotation speed of the rotor. The feed liquid is added to the top of the scraper evaporator along the tangential direction (or to a spinner disk coaxial with the scraper). Due to gravity, centrifugal force, and the scraping action of the rotating blades, a downward-spiraling film forms on the inner wall of the vessel, which is evaporated and concentrated during this process, and the liquid is discharged from the bottom. This evaporator is a single-pass type that utilizes external power to form the film.

Screw Evaporator Features
1. The scraper evaporator boasts high efficiency and capacity, capable of evaporating 100-300 Kg/h of solutions like water and organic solvents.
2. The scraper evaporator has a short residence time for the treated material on the evaporation surface, approximately ±10 seconds, with no coking or scaling.
3. Scraped Film Evaporator can achieve low-temperature evaporation under vacuum conditions.
4. Scraped Film Evaporators are suitable for continuous production, offer high operational flexibility, have a simple structure, are easy to maintain, and can be implemented with automatic control.
5. The scraper evaporator adjusts the inclination angle of the groove on the scraper's outer side, which can regulate the material's residence time within the evaporator to accommodate the evaporation needs of materials with varying viscosities.
6. The刮板蒸发器的 contacting parts and equipment with the material liquid are all made of stainless steel, thereby ensuring the material liquid remains uncontaminated.
7. The scraper evaporator is equipped with a quick-opening lid at the top for easy cleaning of the heating tubes. Light holes and sight glasses are installed on both sides of the top for convenient observation during operation.

Screw Type Evaporator Applications
Screw-type evaporators are used in industries such as oil and petrochemicals, suitable for high-viscosity materials (like gum, honey, etc.) and those prone to crystallization, scaling, and heat sensitivity.