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The falling film evaporator supplier will offer you the beat price and service.

A falling film evaporator system mainly consists of several parts. The first part is the evaporator (the heat exchanger), which is used to heat and evaporate liquid materials. The second part is the separator, mainly used to separate the concentrated liquid and the secondary steam generated after heating. The third part is the preheater, which is used to preheat liquid materials entering the steam and cool the secondary steam in order to recycle and utilize it. The fourth part is the condenser, whose function is to condense the secondary steam so that it can be recycled and utilized. The fifth part is the condensate tank, which is connected to the pump at the outlet and capable of discharging condensate liquid automatically.

Falling Film Evaporator

20L Falling Film Evaporator


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.

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 a 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

Process flow diagram of falling-film evaporator

Laboratory Report

Pressure test report

Water pressure Air pressure Water saving

Pressure testing areaOutside tubeTesting date2017,11,20Process card number_
Pressure accuracy level1.6Pressure gauge0-0.6Pressure gauge verification date2017,05
Pressure gauge noCZ-007Pressure dial diameter(mm)100Test mediumwater
Chloride ion content(mg/L)_Ambient temperature(℃)Normal temperatureMedium temperature(℃)Normal temperature

Specified test pressure 0.4 Mpa

Specified holding time   1  day


Test pressure

Design pressure             -0.1Mpa

30min   30min

Holding time   Holding time

Actual test pressure

  0.4 Mpa

Actual holding time

   1  day


Test pressure

Design pressure               -0.1Mpa

30min   30min

Holding time   Holding time

Test conclusion:This producthas been tested by 0.4 Mpa pressure. The result is no leakage,no visible abnormal deformation,no abnormal noise,and it is qualified.

Inspectors:                         November 20, 2017


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