What is Falling Film Evaporator
A single-effect falling film evaporator can be used to evaporate extract liquid under reduced pressure or vacuum condition so that ethanol and liquid material can be separated, condensed and recycled. The single-effect falling film evaporator used for evaporating ethanol solution is different from the one used for evaporating general aqueous solution. The ethanol has a relatively low boiling point, which is volatile. It’s easy to evaporate ethanol solution under reduced pressure or vacuum condition. So it’s relatively difficult to condense and recycle ethanol steam with a smaller evaporation area. Thus the heat exchange area of the condenser is larger. To obtain a better cooling effect, the two-stage or several-stage method is frequently used for cooling and recycling, which also varies from the evaporation of general aqueous solution.
Principle of Falling Film Evaporator:
The liquid material is distributed evenly into each falling film tube by distributors and flows downward along the tube wall in the form of liquid film. The liquid material is evaporated during the process of flowing downward under actions of gravity and secondary steam flow. The liquid material and secondary steam are separated basically after reaching the lower part of falling film tubes and separated completely after reaching the separation chamber.
Process Structure Diagram
M101 —— Control Cabinet M102 —— Separator
V101 —— Evaporation and Separation Chamber V102 —— Ethanol Receiving Tank
E101 —— Tubular Heater E102 —— Tubular Condenser
V103 —— Vacuum Pump Cooler P01 —— Feed Pump
P04 —— Water Circulating Vacuum Pump
Working Process of Falling Film Evaporator:
Evaporation (E101) —— Separation (M102) —— Condensation (E102) —— Storage Tank (V102)
|Evaporation Rate (L/H)||20|
|Heating Area (㎡)||1|
|Condensing Area (㎡)||2+0.5|
|Vacuum Degree (Mpa)||-0.095|
|Heating Power (KW)||15|
|Feed Pump (KW)||0.75|
|Water Circulating Vacuum Pump (KW)||0.75|
|Power Supply||220V/60Hz Three Phase, other can be customized.|
1. The feed pump is equipped with a sight glass for real-time monitoring of the feed situation.
2. All electrical equipment is integrated in the control cabinet, and they can be supplied power and controlled as long as the control cabinet is electrified.
3. The heating rod internally installed in the evaporator adopts the electric heating that requires no external heat source, which is convenient.
4. The cooling water tank ensures that the cooling water can be recycled.
5. The sight glass can monitor the oil level change at any time after the heat transfer oil is heated.
1.Low heating temperature;
2.Rapid Evaporation Rate;
3.Short retention time of liquid material;
4.Continuous feeding and discharging;
5.Suitable for heat-sensitive material;
6.Low energy consumption.
One-Stop Solution Process
A single-effect falling film evaporator is widely used in food, dairy, chemical, pharmaceutical, biological engineering, environmental engineering and deep processing of corn. For example, it is applicable for the evaporation and concentration of aqueous solution, organic solvent solution, fruit and vegetable juice, milk, egg product, vitamin C, collagen, infusion of tea, sodium glutamate and other liquid materials. It is especially suitable for the evaporation and concentration of heat-sensitive materials, because the beneficial elements can be protected to the greatest extent during the heating and evaporation of materials.