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Please note: This is a dropship item. Therefore, it is not available in-store and may take longer to ship.
A falling film evaporator is an industrial device to concentrate solutions, especially with heat sensitive components. The evaporator is a special type of heat exchanger. In general evaporation takes place inside vertical tubes, but there are also applications where the process fluid evaporates on the outside of horizontal or vertical tubes. In all cases, the process fluid to be evaporated flows downwards by gravity as a continuous film. The fluid will create a film along the tube walls, progressing downwards (falling) - hence the name.
The fluid distributor has to be designed carefully in order to maintain an even liquid distribution for all tubes along which the solution falls. These distributors are usually called ferrules due to their concentric shape. In the majority of applications the heating medium is placed on the outside of the tubes. High heat transfer coefficients are required in order to achieve equally balanced heat transfer resistances. Therefore, condensing steam is commonly used as a heating medium.
For internally evaporating fluids, separation between the liquid phase (the solution) and the gaseous phase takes place inside the tubes. In order to maintain conservation of mass as this process proceeds, the downward vapor velocity increases, increasing the shear force acting on the liquid film and therefore also the velocity of the solution. The result can be a high film velocity of a progressively thinner film resulting in increasingly turbulent flow. The combination of these effects allows very high heat transfer coefficients.
The heat transfer coefficient on the evaporating side of the tube is mostly determined by the hydrodynamic flow conditions of the film. For low mass flows or high viscosities the film flow can be laminar, in which case heat transfer is controlled purely by conduction through the film. Therefore in this condition the heat transfer coefficient decreases with increased mass flow. With increased mass flow the film becomes wavy laminar and then turbulent. Under turbulent conditions the heat transfer coefficient increases with increased flow.
Evaporation takes place at very low mean temperature differences between heating medium and process stream, typically between 3 - 6K, therefore falling film evaporators are ideal for heat recovery in multi stage processes. A further advantage of the falling film evaporator is the very short residence time of the liquid and the absence of superheating of the same. Not considering the vapour separator, the residence time inside the tubes is measured in seconds, making it ideal for heat-sensitive products such as milk, fruit juice, pharmaceuticals, and many others. Falling film evaporators are also characterised by very low pressure drops; therefore, they are often used in deep vacuum applications.
Ai FF70 Falling Film Evaporator Features
Model | FF70 |
Electrical requirements |
208V 60Hz 3~Phase 15 Amps |
Temperature range | 5°C to 100°C |
Production capacity |
70 gallons per hour (dependent upon operator settings) |
Residency time |
Less than 3 minutes |
Material | 304/316, 3A sanitary stainless steel |
Controller | Wash down rated touch screen |
Evaporation & condensing chamber | - Insulated 8 x 45" shell and tube design with 4" inline sight glass - Liquid heated and cooled |
Utility fluids |
Cooling-Dowfrost |
Compliance | UL, C1D2, peer engineer reviewed |
Unit dimensions |
52 x 27.5 x 114" (WxDxH) |
Unit weight | 2,300 Lbs |
Warranty | One year |
Heating system at $20,785 |
- 15-HP Columbia hot water boiler system - 120V 60Hz, 1~Phase, 15 Amps, 630K BTU - Skid mounted - Natural gas fired process heater - High efficiency burner and fuel train - 100-gallon tank capacity - Remote mounted circulation pump and panel - 50-80 gpm flow rate - 50-120°C operating range |
Cooling system at $44,000 |
- 25-ton G&D glycol chiller - 230V 60Hz 3~Phase, 116 Amps - 190 gallon stainless steel tank - Compress: Tandem Scroll - Condenser: Air-cooled with EC motors - Coolant pump: 2 HP - GPM: 65 at 25 PSI - Connection: 1.5" FPT - Heat exchanger: Stainless steel brazed plate - Skid-mounted - Dual scroll compressor with vertical fan system - Frame: Powder coated steel, housing: powder coated aluminum - Enclosure rating: NEMA 3R - Weight: 4,830 Lbs (Approx.) - Refrigerant: R410a - Cooling capacity 30°F: 226,800 BTU/H, 66.5 kW 40°F: 273,000 BTU/H, 80.0 kW 50°F: 324,000 BTU/H, 95.2 kW |
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