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A falling film evaporator system mainly consists of several parts.
• Evaporator (the heat exchanger), which is used to heat and evaporate liquid materials.
• Separator, mainly used to separate the concentrated liquid and the secondary steam generated after heating.
• Preheater, which is used to preheat liquid materials entering the steam and cool the secondary steam in order to recycle and utilize it.
• Condenser, whose function is to condense the secondary steam so that it can be recycled and utilized.
• Condensate tank, which is connected to the pump at the outlet and capable of discharging condensate liquid automatically.

Falling Film Evaporator

What is a Falling Film Evaporator?

A falling film evaporator refers to a concentration and evaporation device used in industries. It is applicable for the concentration and evaporation of water, organic solvents and solutions in the pharmaceutical, food, chemical, light industries and other industries, and it is especially suitable for heat sensitive materials and materials with higher concentration and higher viscosity. The equipment is continuously operated under vacuum and low temperature conditions, with high evaporation capacity, energy conservation, low operating cost. It can ensure that the material is invariable during the evaporation.

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Falling Film Evaporator

How does a Falling Film Evaporator Work?

The working principle of falling film evaporators can be described as follows.

The liquid is added to the upper tube of the heating chamber of the falling film evaporator. Through the liquid distribution and film forming device, it is evenly distributed into the heat exchange tubes. Under the action of gravity and vacuum induction and air flow, it forms a uniform film from the top to the bottom. During the flow, it is heated and vaporized by the shell-side heating medium. The generated steam and the liquid phase enter the separation chamber of the evaporator. The vapor-liquid is sufficiently separated, and the steam enters the condenser for condensation (single-effect operation) or enters the next-effect evaporator. The medium is heated to achieve multi-effect operation, and the liquid phase is discharged from the separation chamber.

Advantages of Falling Film Evaporator

A falling film evaporator can be widely used in industrial, chemical, biochemical, and other fields. It is more and more well-received because of several essential advantages, mainly as follows:

  • The heat transfer coefficient is relatively large due to the material in the heat exchange tube is in the film state and has a fast flow rate.
  • The low temperature difference can be selected, since the pipe material flows downward along the inner wall of the pipe by its own gravity.
  • The chemical properties of heat sensitive materials won’t be affected because of the short residence time of the raw material in the heat exchange tube.
  • The surface state of the heat exchange tube hardly affects the boiling of the material, because it exhibits convection boiling after the tube material is heated.
  • It can save energy because the pipe side material is almost in the ambient temperature without pressure drop.

In conclusion, a falling film evaporator is a high-efficiency device to concentrate solutions, especially heat sensitive one, with so many excellent advantages, such as small occupied land, energy conservation and large heating surface.

Process Flow Diagram of Falling Film Evaporator

How to Improve the Efficiency of Falling Film Evaporator?

  1. Control the amount of mother liquid added in the appropriate range: The attention should be paid to the amount of circulation for falling film evaporators with various evaporation capacities in order to ensure that the liquid film can flow steadily and evenly in the heating tubes.
  2. Control the heat flow intensity: It is necessary to control the steam pressure and ensure the steady steam velocity as well as discharge the non-condensable gas continuously in order to obtain the stable heat flow intensity.
  3. Selection of distributors on the falling film tubes: Distributors act as extremely important components in a falling film evaporator. The form of liquid film depends on distributors. So the selection of distributors is pretty essential. It is required to clean the distributors of falling film evaporators regularly.

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