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Climbing Film Evaporator

Principle:

• Climbing Film Evaporator Utilizes the principle of forming a thin film of liquid that climbs up the walls of a heated tube, enhancing evaporation due to increased surface area and reduced film thickness.

Construction:

Climbing Film Evaporator
Climbing Film Evaporator
  1. Vertical Tubes: Long, vertical tubes where the liquid forms a climbing film.

  2. Steam Jacket: Surrounds the tubes, providing the heat necessary for evaporation.

  3. Feed Inlet: Introduces the liquid at the bottom of the tubes.

  4. Vapor Outlet: For removing the evaporated vapor at the top.

  5. Concentrate Outlet: For removing the concentrated liquid.

Working:

  • The liquid is introduced at the bottom of the vertical tubes.

  • As the liquid heats, vapor bubbles form, causing the liquid to rise and form a thin film on the tube walls.

  • The film climbs up the tube due to the vapor's upward force, evaporating along the way.

  • Vapor is removed at the top, and the concentrated liquid exits through a separate outlet.

Uses:

  • Concentration of heat-sensitive liquids in the food, pharmaceutical, and chemical industries.

  • Evaporation of solvents from solutions in the production of extracts and concentrates.

Merits:

  • Efficient heat transfers due to the thin film and large surface area.

  • Suitable for heat-sensitive materials due to short residence time.

  • High evaporation rates.

Demerits:

  • Complex design and operation.

  • Requires precise control of feed rates and temperatures.

  • High initial investment.


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