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AlfaVap Rising Film Plate Condenser

Looking for a cost effective solution for low pressure vapour condensation? Alfa Laval's AlfaVap, the world's first rising film plate condenser, requires less space, material, money and still provides higher heat transfer efficiency.

The AlfaVap plate evaporator is the result of development work done in collaboration with beet sugar manufacturers in the late 1980s. This new type of costeffective rising film evaporator rapidly became a success in the beet sugar industry and has subsequently spread to many other applications.

There are currently more than 1500 AlfaVap evaporators installed in different applications all over the world, and Alfa Laval provides a complete range of AlfaVap evaporators for a wide selection of applications and capacities.

How It Works
Using a special corrugated plate pattern to generate more turbulence, the AlfaVap provides much higher heat transfer coefficients than the conventional shell and tube evaporator. Designed with evaporation in mind, the AlfaVap features two small inlet feed connections and a large outlet for the vapour and concentrate, one large inlet connection for the heating steam, and two small outlets for the condensate. Using the cassette concept with the plates welded in pairs, the heating steam is condensed in the welded channels while the evaporated product passes through the gasketed channels.

Why Choose AlfaVap?
High heat transfer efficiency - The special corrugated plate pattern induces a high degree of turbulence, providing substantially better heat transfer coefficients than conventional shell-and-tube evaporators. AlfaVap is especially efficient at high concentration and high viscosities, and can work with temperature differences down to 3-4°C. This is a big advantage when AlfaVap is used in TVR and MVR systems.

Cost saving - High heat transfer efficiency means that much less heat transfer area is needed compared to shell-and-tube evaporators. This makes AlfaVap extremely economical, especially when exotic materials such as SMO, titanium, nickel and Hastelloy are required. In addition, the compact and flexible design of AlfaVap drastically reduces transport, erection and installation costs compared to shell-and-tube units.

Less fouling and easy maintenance - The high turbulence over the whole plate does not just reduce fouling but also makes chemical cleaning very effective. Due to the low hold-up volume, only very small quantities of cleaning chemicals are needed compared to shell-and-tubes. The flexible design of the AlfaVap means the heat transfer surfaces are easily accessible for inspection or mechanical cleaning by simply removing the tightening bolts and rolling back the pressure plate.

Easy to increase capacity - A popular feature of AlfaVap is that the capacity can be increased or reduced by just adding or removing cassettes in the existing frame. This is a major advantage in relation to shell-and-tube evaporators, where capacity is fixed at the level decided on at the time of installation.

Improved product quality - The extremely low hold-up volume means that very little product is actually in the AlfaVap at any given time. The short time the product spends in the evaporator is a big advantage for heat sensitive products. It also permits rapid start-up and shut down, with only minimal waste.

Applications
There are more than 1500 AlfaVap and/or AlfaCond installations in different applications all over the world. Alfa Laval can provide a complete range of AlfaVap and AlfaCond units for a large range of applications and capacities. Some of the applications where AlfaVap and/or AlfaCond units are installed include: Alumina liquor Ammonium lactate Ammonium nitrate Beet sugar Calcium chloride Cane sugar Copper electrolyte Corn steep liquor Dextrose Effluent streams Electrolytes Ethanol reboilers Ethylene glycol Ferric chloride Fish and meat extract Fish and meat stick water Fish silage Fructose Fruit juice Gelatine Gluconic acid Glucose Glycerine Hydrolysate Kaolin Lactic acid Lysine Maltodextrine Maltose MEA reboilers Polyols Soap Sodium chloride Sodium hydroxide Sodium sulphate Sorbitol Stillage Waste waters Vinasses

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