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Scraped surface evaporator is a kind of high efficient evaporation and distillation equipment, which distributes the liquid on the heating surface through the high-speed rotating scraper to form a uniform film for evaporation or distillation. This equipment is especially suitable for heat-sensitive, high viscosity, easy to crystallize or particle-containing materials.The rising film evaporator preheats the feed liquid to the boiling point, adds it from the bottom of the heating chamber and vaporizes strongly in the heating pipe, so that the generated steam drives the feed liquid to rise in a film shape along the pipe wall. The liquid film continues to evaporate in the rising process. The solution only needs to pass through the heating tube once to reach the required concentration. This evaporator is suitable for dilute solutions and heat sensitive materials with low concentration.
Working principle
The working principle of the Scraped surface evaporator is to use a rotating scraper to distribute the liquid on the heating surface to form a thin film which is heated and evaporated in the process of descending, and the finished liquid is discharged from the bottom, and the secondary vapor escapes from the top. This kind of evaporator can be operated under vacuum condition, so it is especially suitable for low temperature evaporation of heat-sensitive materials.
Scraper form of Scraped surface evaporator
- **Centrifugal scraper**: Depends on the rotor to exert a centrifugal force on the material, so that the material forms a thin film on the evaporating surface.
- **Hinged scraper**: suitable for the material which is easy to be scaled on the heating surface, the scraper is usually made of metal and installed by movable hinge.
- **Fixed scraper**: the gap between scraper and inner wall of evaporation cylinder is only 1-2mm, suitable for the evaporation and concentration of extra-high viscosity and foam-prone materials.
| Item | GKGB-0.8 | GKGB-1.5 | GKGB-2.5 | GKGB-4 | GKGB-6 | GKGB-10 |
|---|---|---|---|---|---|---|
| Heating exchange area m2 | 0.8 | 1.5 | 2.5 | 4 | 6 | 10 |
| Steam pressure MPa | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 |
| Vaccum degree KP | 70 | 70 | 70 | 70 | 70 | 70 |
| evaporation capacity kg/n | 160 | 300 | 500 | 800 | 1200 | 2000 |
| kg/n | 168 | 315 | 525 | 840 | 1260 | 2100 |
| Motor powerKW | 1.1 | 1.5 | 2.2 | 4 | 5.5 | 11 |
| Speed rpm | 300 | 300 | 280 | 134 | 134 | 88 |
| Height mm | 2500 | 3295 | 4100 | 5180 | 5800 | 7800 |
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