Introduction Of The Scraper Film Evaporator

The scraper film evaporator is a housing with a heated steam jacket on the outside and a rotating scraper inside. The scraper is driven by the rotary shaft at the center of the cylinder. After the feed liquid is tangentially fed from the upper portion of the evaporator, a film is formed along the inner wall of the casing, driven by gravity and a rotary blade. The liquid is discharged from the bottom of the evaporator, and the secondary vapor is discharged from the upper portion of the evaporator. The outstanding advantage of this type of evaporator is its adaptability to materials. Suitable for evaporation of high viscosity, easy to crystallize, easy to scale, suspended or heat sensitive materials.

The material continuously enters the horizontal evaporator from the large diameter end, and the scratched diaphragm accelerates the distribution, immediately forming a flowing film on the heated surface. The tapered thin film evaporator relies on the centrifugal force exerted by the rotor on the material. The centrifugal force has two effective forces, one perpendicular to the heated surface and the other toward the large diameter end body (note: the same result also appears in the vertical cone thin film evaporator). It relies on these forces to create material acceleration, and the incoming material ensures that the heated surface is sufficiently moist and does not rely on steam. Hair ratio or feed rate. Therefore, local material overheating and thermal degradation are completely reduced or eliminated.