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Wuxi Yiteng Pressure Vessel Co, Ltd.
Add：No 58, Zhenyang Road, Qingyang Town, Jiangyin, Jiangsu
Contacts：Mr. Zhang
Tel：13506192042
Fax：0510-86557866
Website：www.yitengrq.com
E-mail：wxzhangyaodong@163.com / yeekai@yitengrq.com

Falling Film Reboiler

Technical Specifications of Falling Film Reboiler

The Falling Film Reboiler is a high-efficiency evaporation device where liquid flows downward as a thin film on vertical tubes for evaporation. It is ideal for high-boiling-point, heat-sensitive, and fouling-prone media in distillation systems. Below are its core technical parameters:

1. Key Technical Parameters

Parameter	Typical Value/Range	Remarks
Design Standard	ASME VIII Div.1 / TEMA BEM / GB 151	Pressure vessel standards
Evaporation Area	20~1000 m²	Customizable
Design Pressure (Shell/Tube Side)	0.1~4.0 Mpa (1~40 bar)	Supports vacuum (≤0.01 Mpa)
Design Temperature	-20°C to +350°C	High-temp. models up to 400°C
Shell Material	Carbon Steel (Q345R) / SS304 / SS316L / Hastelloy	Corrosion-resistant
Tube Bundle Material	SS316L / 2205 Duplex / Titanium	Anti-cavitation
Tube Diameter/Length	Φ25~Φ50 mm / 4~12 m	Vertical layout for film optimization
Film Thickness	0.1~2 mm	Controlled via distributor
Heat Source	Steam (0.3~1.5 Mpa) / Thermal Oil / Molten Salt	Multi-source compatible
Evaporation Efficiency	30%~90%	Depends on media & ΔT
Pressure Drop (Tube Side)	≤10 kPa	Low resistance
Connection Standard	ANSI / DIN / GB Flanges	DN80~DN500

2. Structural Features

o Film Distribution System – Top-mounted distributor ensures uniform film (CV≤5%).
o Vertical Tube Bundle – Gravity-driven film minimizes fouling.
o Low Liquid Level Operation – Reduces energy consumption.
o Modular Maintenance – Removable tubes and distributor for easy cleaning.

3. Typical Applications

o Chemical Distillation: High-boiling solvents (e.g., DMF, DMSO)
o Pharma Concentration: Heat-sensitive extracts (e.g., antibiotics)
o Desalination: Multi-effect evaporation (MED)
o Food Processing: Low-temp. syrup/juice concentration

4. Data Required for Selection

o Media Properties: Composition, boiling point, viscosity, thermal sensitivity.
o Process Needs: Evaporation rate (kg/h), feed temp., operating pressure.
o Heat Source: Steam pressure or thermal oil temp.
o Distribution: Film uniformity requirements.

5. Advantages

o High Efficiency – Film heat transfer coefficient: 2000~5000 W/(m²·K)
o Low-Temp Operation – Vacuum compatibility protects heat-sensitive materials.
o Anti-Fouling – Film flow scours tube walls.
o Energy Saving – 20%~40% more efficient than kettle reboilers.

6. Comparison with Other Reboilers

Feature	Falling Film Reboiler	Kettle Reboiler	Thermosiphon Reboiler
Heat Transfer	Gravity-driven film evaporation	Submerged boiling	Natural circulation
ΔT Suitability	Small ΔT (≤30°C)	Large ΔT (≤80°C)	Medium ΔT (≤50°C)
Fouling Risk	Very low	High (bottom deposits)	Moderate (flow-dependent)
Energy Use	Low	High	Medium

Note: Requires precision distributors. Inspect nozzles regularly for clogging.