Falling film evaporation is the process of adding material liquid from the heating chamber of the falling film evaporator into the tube box, and evenly distributing it into each heat exchange tube through the liquid distribution and film formation device. Under the influence of gravity, vacuum induction, and airflow, it flows in a uniform film shape from top to bottom. During the flow process, the steam generated by the shell side heating medium vaporizes and enters the separation chamber of the evaporator together with the liquid phase. The steam and liquid are fully separated, and the steam enters the condenser for condensation (single effect operation) or enters the next effect evaporator as the heating medium, thus achieving multi effect operation. The liquid phase is discharged from the separation chamber. Falling film evaporators are widely used for the evaporation and concentration of water or organic solvent solutions in industries such as medicine, food, chemical, and light industry, and can also be widely used for waste liquid treatment in these industries.

Below, the editor briefly introduces the product features of a falling film evaporator, as follows:

1. The liquid retention is small, and the falling film evaporator can operate quickly according to changes in energy supply, vacuum degree, feed rate, concentration, etc.

2. Due to the fact that the process fluid only flows under the action of gravity, rather than being propelled by a high temperature difference, low temperature difference evaporation can be used.

3. Due to the film like flow of the solution in the one-way evaporator, the heat transfer coefficient is relatively high.

4. The falling film evaporator is suitable for evaporation and concentration of foaming materials. Since the feed liquid evaporates in a film form in the heating tube, vapor liquid separation is formed. At the same time, at the bottom of the effector, most of the feed liquid is pumped away. Only a small part of the feed liquid and all the secondary vapor enter the separator to strengthen separation. The whole process of the feed liquid does not form too much impact, avoiding the formation of foam.

5. Short residence time, less likely to cause material deterioration, suitable for handling heat sensitive materials.

6. The feed liquid of the falling film evaporator is added from the top of the evaporator, and under the action of gravity, it forms a film like descent along the pipe wall, and evaporates and thickens during this process, obtaining a concentrated liquid at its bottom. The falling film evaporator can evaporate materials with high concentration and viscosity.

Through the above content, the editor hopes that it will be helpful for everyone to understand the falling film evaporator.