1) The feed liquid of the falling film evaporator is added from the top of the evaporator, and falls in a film shape along the tube wall under the action of gravity, and during the process, it evaporates and thickens, and a concentrated liquid is obtained at the bottom of the evaporator. Falling film evaporator can evaporate materials with higher concentration and higher viscosity.
2) Since the solution flows as a film in the single-pass evaporator, the heat transfer coefficient is relatively high.
3) The residence time is short, it is not easy to cause material deterioration, and it is suitable for processing heat-sensitive materials.
4) The liquid hold-up is small, and the falling film evaporator can operate quickly according to changes in energy supply, vacuum, feed volume, concentration, etc. Near constant,
5) Since the process fluid flows only under the action of gravity and not driven by high temperature difference, low temperature difference evaporation can be used.
6) The falling film evaporator is suitable for the evaporation and concentration of foaming materials. Because the material liquid evaporates in the heating tube as a film, vapor-liquid separation is formed. Part of the material liquid and all the secondary steam enters the separator to strengthen the separation, and the material liquid integration process does not cause too much impact, avoiding the formation of foam