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Falling Film Evaporator is a commonly used equipment for solution concentration and evaporation separation. It allows the liquid to quickly evaporate and concentrate by flowing along a vertical wall in the form of a thin film and making it come into contact with a heated surface.


A falling film evaporator usually consists of a vertical cylindrical or rectangular shell, built-in heating pipes or surfaces, an upper feed distributor, and a lower collector. The solution is introduced into the feed distributor through the feed pipeline and then flows evenly to the side walls of the shell. On the inner wall of the shell, there are heating pipes or plates, and heat is transferred from the heating surface to the solution, causing it to evaporate. The evaporated gas and residual liquid are separated and discharged separately from the top and bottom of the equipment. During the evaporation process, the liquid film flows in a free falling manner, hence it is called a falling film evaporator.


The falling film evaporator mainly has the following advantages:
1. The liquid in the evaporator flows in the form of a thin film, with high heat and mass transfer efficiency.
2. The equipment has a compact structure, small volume, and a small footprint.
3. Suitable for evaporation and concentration of heat sensitive substances, as the liquid has a short residence time and a low heat load.
4. Flexible operation, suitable for handling solutions of different concentrations and flow rates.
Due to the characteristics of thin film flow, the sensitivity of falling film evaporators to scaling and pollutants is relatively low.


Falling film evaporators are widely used in fields such as chemical, food, pharmaceutical, and environmental protection. It can be used for processes such as concentration of solid substances in solutions, wastewater treatment, and food concentration.


Application


1. Product:orange clear juice, grape clear juice , or lemon clear juice, or similar juice.
2. Evaporating capacity: 2T/h, material inlet: 3t/h
3. material original concentration: 6~10%

Designed parameter


Machine type Three-stage falling film downstream evaporator
Steam consumption: ~1600kg/h;0.1~0.3Mpa;
Evaporating capacity 4T/h, material inlet: 5t/h;
Cooling water consumption ~96t/h,inlet30°C,outlet38°C
First stage evaporating temperature 72~82℃ (-0.071~-0.051)
Second stage evaporating temperature 60~70℃(-0.080~-0.069)
Third stage evaporating temperature 45~55℃(-0.09~0.085)
Total rated power ~28KW


3. Application


This equipment is widely used in the luquid material concentrating, like milk, glucose, oligosaccharides, sorbitol, fruit and vegetable juice. And there is a wide range of applications on the concentrating of aqueous solution and organic solvent solution in the area of food processing, pharmacy, grain processing, beverage ,light industry, environmental protection as well as the chemical industry etc.

4. Performance characteristics


1. Steam heating is uniform, with high heat transfer efficiency and short heating time;
2. Waste heat can be fully used as a heat source to reduce the amount of raw steam;
3. The materials are evenly distributed in the heating tubes of the evaporator through the distribution device. Under the induction of gravity and vacuum and the action of air flow, the materials form a film and flow from top to bottom. During the movement, they exchange heat with the heating steam on the outer wall of the heating tube and evaporate;
4. The evaporation process is in a vacuum environment, the evaporation temperature is relatively low, and the evaporator is not easy to scale;
5. It is applicable to the evaporation and concentration of foaming materials. As the material liquid evaporates in a film form in the heating tube, that is, vapor-liquid separation is formed. At the same time, at the bottom of the effect, most of the material liquid is pumped away, and only a small part of the material liquid and all the secondary steam enter the separator to strengthen the separation. The whole process of the material liquid does not form too much impact, avoiding the formation of foam;
6. For the evaporation and concentration of fruit juice or dairy products, the equipment can also have the sterilization function. The materials are preheated first, and then enter the sterilizer, which can reach 90-125 degrees, and maintain for about 30-60 seconds, that is, enter the effect body. The materials flash rapidly, and the temperature drops instantly;
7. This equipment can be equipped with CIP cleaning system to realize on-site cleaning. The whole set of equipment is easy to operate without dead corners;
8. It can be equipped with steam jet pump to reduce steam consumption and save operation cost;
9. Continuous feeding and discharging of the equipment;
10. This equipment can be configured with an automatic control system with complete configuration, operation, monitoring and control functions. The system includes communication interface, display alarm, print report, control and other parts to realize automatic control of feeding volume, heating temperature, discharge concentration and cleaning.


5. Equipment composition


Evaporator, separator, condenser, executive pressure pump, direct capacity pump, feed liquid pump, condensate pump, operating platform, electrical instruments, valve pipelines and other systems.


Equipment configuration list


NO. Name Spec Qty Unit Remarks
1 First stage evaporator 57m2 1 piece

Material: SUS304, tubular type; with material distributing device;shell diameterΦ442,thickness:3mm,
heat-exchanging tube sizeΦ25X1.2,121 pieces of tubes.

2 Second stage evaporator 73m2 1 piece

Material: SUS304, tubular type; with material distributing device;shell diameterΦ546,thickness:3mm,
heat-exchanging tube sizeΦ32X1.2, 121 pieces of tubes.

3 Third stage evaporator 86.6m2 1 piece

Material: SUS304, tubular type; with material distributing device;shell diameterΦ622,thickness:3mm,
heat-exchanging tube sizeΦ38X1.5, 121 pieces of tubes.

4 First stage separator Φ800X1600X4 1 piece Tangent intubation are connected to the evaporator; with sight glasses and cleaning nozzle; The steam-liquid separation; 304 shell material, oval head
5 Second stage separator Φ800X1600X4 1 piece Tangent intubation are connected to the evaporator; with sight glasses and cleaning nozzle; The steam-liquid separation; 304 shell material, oval head
6 Third stage separator Φ1000X2000X4 1 piece Tangent intubation are connected to the evaporator; with sight glasses and cleaning nozzle; The steam-liquid separation; 304 shell material, oval head
7 Condensor 83m2 1 piece

Material: SUS304, tubular type; with material distributing device;shell diameterΦ548,thickness:4mm,
heat-exchanging tube sizeΦ32X1.2, 139 pieces of tubes.

8 Valve pipe fittings
1 set The connection tubes between the evaporator system, the material 304, excluding raw steam pipes, cooling water pipes, process water pipe and outer pipe system
9 Electric instrument
1 set

Including thecontrol cabinet, thermometer, pressuregauge,

system cable, flowmeter etc.

10 Platform
1 set Carbonated steel




6. Working process:

The primary steam firstly enters into the first stage heating chamber to heat the materials, and in the vacuum condition, injects into first stage evaporating chamber through tubes, the materials return back to heating room through curve, and are heated again then injected to evaporating section, and form the circular. When the material liquid is sprayed into the evaporation chamber and nebulized, moisture is quickly evaporated, and the evaporated second steam enters to the second stage heating chamber to heat the material, and in the vacuum condition, injects into second stage evaporating chamber through tubes, the materials return back to heating room through curve, and are heated once more then injected to evaporating section, and form the circular. Then the material liquid is sprayed into the evaporation chamber and nebulized, moisture is quickly evaporated, and the evaporated third steam enters to the third stage heating chamber to heat the material and finally the steam goes into the condensor, and cooled by tap water into condensate water, and discharged tilll it reaches hlaf of the sight glass.
The moisture in the liquid material is continiously evaporated and concentration is increased to the expected rate and discharged from outlet.
The cooling water temperature will be increased to 30 -40 degree after the condenser exchanging, and sent to the water resource for whole plant usage or cooling tower recycling .


Process Flow

falling film evaporator

Scope of application

It is suitable for low-temperature continuous evaporation and concentration in the food, pharmaceutical, chemical, biological, environmental protection, and youyikou Temple industries. It has the remarkable characteristics of high heat transfer rate and short heating time in the physical department. It is more suitable for heat sensitive, foaming and other materials.





falling film evaporator
Technical Parameters
Model BYJM-3-3 BYJM-3-5 BYJM-3-10 BYJM-3-20 BYJM-3-30 BYJM-3-50
Water evaporation(kg/hr) 3000 5000 10000 20000 30000 50000
Steam consumption(t/hr) 0.9-1.2 1.5-2 3-4 6-8 9-12 15-20
Steam pressure(Mpa Absolute pressure) 0.4-0.8
Water evaporation(tons)/1ton steam 2.5-3.33
vacuum degree 1 effect(MPa) -0.01-0.18
3 effect(MPa) -0.085
Evaporation temperature 1 effect(MPa) 70-115
3 effect(MPa) 45-55
External dimension(LxWxH) 5x2.8x10 6x3.5x11 7.2x4.1x11.3 9x5x14 11x6x14 12.5x7.6x14
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