RISING FILM EVAPORATORS

 

OPERATION

In rising film evaporators the product is introduced into the evaporator from the bottom. As the product enters the bottom of the heating tubes, it begins to boil, creating vapor. The pressure of the vapor causes the product to start rising as a thin film, pressing it against the heating tubes. As the product rises at boiling point, more evaporation takes place. The product may be recycled in order to achieve the desired concentration.

 

The highly turbulent flow of the rising product is beneficial in the evaporation of highly viscous products or products that have a fouling tendency.

 

In order for the vapor flow to have enough energy to start rising the product, the temperature difference between the heating side and the boiling needs to be high. Otherwise the rising film is not created.

 

 

We at RALLI OY (Ltd.) are experts of several kinds of evaporation technologies, including multi-staged rising film evaporators, using thermal vapor recompression (TVR) or mechanical vapor recompression (MVR). We have more than 20 years of expertise in designing, commissioning and refurbishing evaporation systems. If you have a need for a new or used evaporator or want to increase the capacity of your existing evaporation solution, contact us. Our team of experts will find the best suitable solution for you.