Understanding the performance characteristics of thin film evaporators

     Thin film evaporator performance characteristics：
     First, the vacuum pressure drop is relatively small
When the vaporized gas of the material is sent directly from the heating surface to the external condenser, there is a pressure difference. If it is a normal evaporator, the pressure drop will be higher and may be higher than the range, but scraping The plate thin film evaporator is relatively large in the space through which the gas passes, and the evaporator and the internal pressure, as well as the condenser are substantially the same in pressure, so the entire pressure drop will be relatively small.
     Second, the operating temperature is low
Because of the above factors, the higher vacuum conditions are maintained during the entire evaporation process, and because the vacuum degree is increased and the corresponding material is decreased in boiling point, the operation can be completed at a lower temperature, which is effective. The overall thermal decomposition of the product is reduced.
      Third, the time of heating is relatively short
Because the squeegee film evaporator is unique in structure, and the squeegee device also has the function of pumping, the time for the material to stay inside the evaporator is shorter, and on the surface of the evaporator that is heated, because the film At high speeds, the product does not directly stay on the surface of the evaporator, so it is suitable for evaporation of heat sensitive materials.
      Fourth, the high intensity of evaporation
After the material is lowered at the boiling point, the temperature difference with the heat medium is also increased, and the decrease of the thin film evaporator appears as the thickness of the liquid film in the turbulent state, and the thermal resistance is also effectively reduced. Moreover, during the whole process, the phenomenon of scale formation and walling may be reduced when the material is heated, and the main thing is accompanied by relatively good heat exchange.
      Fifth, the flexibility of operation is relatively large
It is precisely because the scraper film evaporator has a unique performance, which makes it more suitable for heat sensitivity, and requires smooth evaporation, or high-viscosity materials for processing, and can also increase the concentration of materials in the amount of processing. Ascending, the entire evaporation process is smooth, allowing it to be used in the distillation and evaporation of materials such as crystallization, fouling and polymerization.
     In fact, the scraper film evaporator is very adaptable, and it is also a relatively new type of evaporator. Whether it is heat sensitive, high viscosity, scale and easy to crystallize, the scraper film evaporator can be used. Process it.