Operating principle of scraper film evaporator

Due to the special structure of the scraper film evaporator, the wiper has a pumping effect, so that the time for the material to stay in the evaporator is short; on the other hand, the product will not stay on the heated evaporator due to the high-speed turbulence of the film. On the surface of the evaporator. Therefore, the scraper film evaporator is uniquely used for the evaporation of heat-sensitive materials.

As for the scraper film evaporator, the decrease of the boiling point of the material increases the temperature difference with the heat medium, reduces the thickness of the liquid film that reveals the turbulent shape, and reduces the thermal resistance. At the same time, in the process, the compacted materials are walled and scaled on the heating surface, and they have excellent heat exchange. Therefore, the overall heat transfer coefficient of the scraper film evaporator is increased.

The material continuously enters the scraper film evaporator from the large-diameter end. It is accelerated and dispatched by the scraper film and immediately creates a thin flowing film cone-type thin film evaporator on the heating surface. It depends on the rotor to apply a centrifugal force to the material. This centrifugal force has two useful labors, one is perpendicular to the heating surface, and the other is towards the target of the large diameter end body. These materials rely on these forces to accelerate the material, and the incoming material ensures that the heating surface is fully wetted, and does not depend on the evaporation ratio or the feeding speed. . Therefore, the overheating and thermal degradation of the one-sided material in the scraper film evaporator are reduced or completely eliminated.

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