Performance characteristics of scraper film evaporator

Low vacuum pressure drop:

The material vaporized gas is sent from the heating surface to the external condenser, and there is a certain pressure difference. In a normal evaporator, this pressure drop (Δp) is usually relatively high, sometimes even unacceptably high. The scraper type thin film evaporator has a large space for gas to pass through. The pressure in the evaporator can be regarded as almost equal to the pressure in the condenser. Therefore, the pressure drop is small and the vacuum degree can reach 5mmHg.

Low operating temperature:

Due to the above characteristics, this allows the evaporation process to be performed under a relatively high vacuum condition. As the degree of vacuum increases, the boiling point of the corresponding material decreases rapidly. Therefore, the operation can be performed at a lower temperature, which reduces the thermal decomposition of the product.

Short heating time:

Due to the unique structure of the scraper-type thin film evaporator, the wiper has a pumping effect, so that the residence time of the material in the evaporator is very short. In addition, the high-speed turbulence of the thin film on the heated evaporator makes the product not stay in the evaporation Surface. Therefore, it is especially suitable for the evaporation of heat-sensitive materials.

High evaporation intensity:

The decrease of the boiling point of the material increases the temperature difference with the heat medium; the function of the wiper reduces the thickness of the liquid film in a turbulent state and reduces the thermal resistance. At the same time, in the process, the material is inhibited from forming walls and scaling on the heating surface, and it is accompanied by good heat exchange. Therefore, the overall heat transfer coefficient of the scraper film evaporator is improved.

Large operation flexibility:

It is precisely because of the unique properties of the scraper film evaporator that it is suitable for processing heat-sensitive and high-viscosity materials that require smooth evaporation, as well as a sharp increase in viscosity with increasing concentration, and the evaporation process can also be smoothly evaporated. It can also be successfully applied to the evaporation and distillation of materials containing solid particles, crystallization, polymerization, scaling, etc.

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