Falling Film Evaporator
A shell and tube heat exchanger is divided into two compartments. It’s most basic function is to bring a heating or cooling fluid, called media, into indirect but intimate contact with a product fluid, called the process fluid. Energy, as heat, is transferred rapidly and efficiently across a shell & tube heat exchanger between the media and process fluids. When the goal is to use an S&T heat exchanger to evaporate a component of the process fluid, then the media is hotter than the process fluid, and energy is transferred into the process liquid from the media.
In the specific case of the falling film evaporator, the heating media is circulated through the shell side of the S&T heat exchanger. The process fluid is passed through the tube side of the evaporator. Energy is transferred from the heating media into the product, and a portion of the product is vaporized.
The process liquid is pumped into the top of the falling film evaporator and is distributed evenly across all of the heating tubes in the heat exchanger. It is very important that the liquid be well distributed so that it evenly flows down the inside walls of each tube. This film of liquid that is descending through the tubes is known as a “falling film” and is where this particular heat exchanger derives its name.
Explore our Basket Filter for efficient liquid filtration solutions.
FAQ’s
What is a Falling Film Evaporator?
A Falling Film Evaporator is a heat-transfer and evaporation system used to concentrate liquid solutions by removing a portion of the solvent, usually water. The feed forms a thin film along the heating surface and flows downward under gravity.
How does a Falling Film Evaporator work?
The liquid feed is distributed over the inner surface of heated tubes, forming a thin falling film. As the liquid moves downward, heat causes the solvent to evaporate. The concentrated product is collected at the bottom while the generated vapour is separated from the liquid.
What are the advantages of a Falling Film Evaporator?
Falling Film Evaporators offer high heat-transfer efficiency, short residence time, low operating temperatures under vacuum, and relatively low energy consumption. Their short residence time also makes them suitable for many heat-sensitive products.
Where are Falling Film Evaporators used?
Falling Film Evaporators are widely used in chemical, pharmaceutical, food processing, dairy, bulk drug, specialty chemical, wastewater treatment, and other process industries for concentration and solvent or water removal.
How do I select the right Falling Film Evaporator?
The selection of a Falling Film Evaporator depends on factors such as feed flow rate, solids concentration, required evaporation capacity, operating temperature and pressure, product viscosity, heat-transfer properties, and desired final concentration. The system should be designed according to the specific process requirements.
Need Urgent Supply? Enquire Now
We manufacture and export Falling Film Evaporator across the globe, we stock ready for urgent supplies.