What is rising film evaporator
Rising film evaporator is also know as vertical long tube evaporator, rising tube evaporator.
Rising film evaporators are suitable for dilute solutions with low concentration and heat-sensitive materials.
The solution is preheated to the boiling point, added from the bottom of the heating chamber, and strongly vaporized in the heating tube. The generated vapor drives the liquid to rise in the form of a film along the pipe wall. The liquid film continues to evaporate as it rises. The solution can reach the required concentration through the heating tube.
rising film evaporator working principle
Rising film evaporator is essentially a vertical shell and tube heat exchanger. The vaporized liquid is fed into the long tube from the bottom, where steam is generated in the tube and the liquid inside boils. The steam presses the liquid against the wall of the tube and creates a lift. As more vapor is formed, there is a higher pressure inside the tube, forcing the remaining liquid against the walls of the tube, forming a film that moves upward. Therefore, this type of evaporator is called a rising film evaporator.
rising film evaporator function
Rising film evaporators are widely used in sewage treatment, polymer production, food production, thermal desalination, pharmaceutical and solvent recovery industries; Rising film evaporators are mainly used as reboilers, preconcentrators, flashers or preheaters of distillation columns.
rising film evaporator advantages
Suitable for sticky products
No need for circulation pump
Relatively high heat transfer coefficient
Can handle a small amount of suspended particles
Short residence time of liquid feed in the evaporator
Suitable for medium heat sensitive liquids, viscous liquids
rising film evaporator parameters
| Model | RFE-500 |
| Evaporation Capacity（L/MIN） | 500 |
| Evaporation Temperature（℃） | 55 ~ 75 |
| Vacuum Degree（Mpa） | -0.06 ~ -0.095 |
| Buffer Tank（L） | 500 |
| Preheating Area（M2） | 2 |
| Heating Area（M2） | 20 |
| Condensing AreaM2） | 20 |
| Cooling Area（M2） | 1 |
| Coolant Collection Tank（L） | 300 |
| Charge Pump（T/H） | 2 |
| Concentrate Discharge Pump（T/H） | 2 |
| Coolant Discharge Pump（T/H） | 1 |
| Water Ring Vacuum Pump(L/MIN) | 833 |
| Material | 304 |
design of rising film evaporator
The rising film evaporator is mainly composed of the preheater, heater, condenser, collection tank, charging and discharging pump, etc.
E101—Plate Preheater
E102—Heater
E103—Plate Condenser
E104—Snake Cooler
V101—Buffer Tank
V102—Coolant collection tank
S101—Separation Chamber
S102—Gas-liquid Separator
P101—Charging Pump
P102—Concentrate Discharge Pump
P103—Coolant Discharge Pump
P104—Water Ring Vacuum Pump
rising film evaporator vs falling film evaporator
Rising film evaporators are suitable for dilute solutions with low concentration and heat-sensitive materials.
Rising film evaporators are mainly used for concentration, distillation and recovery of organic solvents
Rising film evaporator adopts decompression concentration technology, which greatly reduces energy consumption and operating cost.
Falling film evaporators are a special type of heat exchanger that can be used to concentrate solutions, especially those with heat-sensitive components.
Falling film evaporators are suitable for clean, sediment-free liquids.
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