Falling Film Evaporator Design

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• Is this for a new plant?
• What is the desired output (how much product)?
• Are you trying to control concentration?
• What is your depth of experience in doing something like this?

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Process flow

The process of falling film evaporator has four forms: co-current (co-current), counter-current, mixed-current (cross-flow), and advection:

Downstream

The solution and steam flow in the same direction and they flow from one effect to the last effect. The raw material liquid is pumped into one effect, and it automatically flows into the next effect depending on the pressure difference between the effects, and the liquid is pumped out from the last effect (usually operated under negative pressure). Because the pressure of the latter effect is low, the boiling point of the solution is also low. When the solution enters the first effect, the solution will flash part of the water and generate more secondary steam. Since the concentration of the aftereffect is higher than the previous effect, the operating temperature is lower. The heat transfer coefficient of the first effect is often much higher than the last effect. Downstream processes are generally suitable for processing heat-sensitive materials at high concentrations.

Countercurrent

The raw materials are sent from the final effect to the pre-effect in turn by the pump, the finished liquid is discharged from the first effect, and the material liquid and steam flow in reverse. It is generally suitable to handle solutions whose viscosity changes greatly with temperature and concentration, and it is not easy to handle heat-sensitive materials.

Mixed flow

The combination of forwarding and backward flow combines the advantages of forwarding and backward flow to avoid its disadvantages, but the operation is complex and requires a high degree of self-control.

Advection

Each effect is fed with a complete solution, and each effect has crystals that can be separated in time. It is generally used for the evaporation of saturated solutions.

The process of falling film evaporator has four forms: co-current (co-current), counter-current, mixed-current (cross-flow), and advection:

Downstream

The solution and steam flow in the same direction and they flow from one effect to the last effect. The raw material liquid is pumped into one effect, and it automatically flows into the next effect depending on the pressure difference between the effects, and the liquid is pumped out from the last effect (usually operated under negative pressure). Because the pressure of the latter effect is low, the boiling point of the solution is also low. When the solution enters the first effect, the solution will flash part of the water and generate more secondary steam. Since the concentration of the aftereffect is higher than the previous effect, the operating temperature is lower. The heat transfer coefficient of the first effect is often much higher than the last effect. Downstream processes are generally suitable for processing heat-sensitive materials at high concentrations.

Countercurrent

The raw materials are sent from the final effect to the pre-effect in turn by the pump, the finished liquid is discharged from the first effect, and the material liquid and steam flow in reverse. It is generally suitable to handle solutions whose viscosity changes greatly with temperature and concentration, and it is not easy to handle heat-sensitive materials.

Mixed flow

The combination of forwarding and backward flow combines the advantages of forwarding and backward flow to avoid its disadvantages, but the operation is complex and requires a high degree of self-control.

Advection

Each effect is fed with a complete solution, and each effect has crystals that can be separated in time. It is generally used for the evaporation of saturated solutions.

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