Screw Evaporator

       Screw Evaporator Working Principle

The scraper evaporator housing is equipped with a heating steam jacket internally, which contains rotatable blades or scrapers. There are two types of scrapers: fixed and rotor-style, with the former having a gap of 0.5 to 1.5mm between it and the inner wall of the housing, and the latter having a gap that varies with the rotational speed of the rotor. The feed liquid is added to the scraper evaporator from the top along the tangential direction (or added to a spinner disk coaxial with the scraper as well). Due to the action of gravity, centrifugal force, and the scraping effect of the rotating blades, a downward spiraling film of solution forms on the inner wall of the vessel and is evaporated and concentrated during this process, with the liquid being discharged from the bottom. This type of evaporator is a single-pass evaporator that utilizes external power to form the film.

       Screw-type 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 scraped surface heat exchanger has a short residence time for the treated material on the evaporation surface, approximately ±10 seconds, and does not cause coking or scaling.

3. Scraped Film Evaporators enable low-temperature evaporation under vacuum conditions.

4. The刮板蒸发器is suitable for continuous production, offers great operational flexibility, has a simple structure, is 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 modify the residence time of material inside the evaporator to accommodate the evaporation needs of materials with varying viscosities.

6. The scraper evaporator and all parts in contact with the liquid material are made of stainless steel, ensuring the material remains uncontaminated.

7. The scraper evaporator is equipped with a quick-release cover on the top for easy cleaning of the heating tubes. Light holes and a sight glass are installed on both sides of the top for convenient observation during operation.

       Screw Evaporator Application Range

Screw evaporators are used in the oil and chemical industries, suitable for high-viscosity materials (such as gum, honey, etc.) and those prone to crystallization, scaling, and heat sensitivity.