Plate Evaporator

These Plate Evaporator units are developed, designed and manufactured in our well-equipped facilities. Since we can offer both the tubular falling-film evaporator technology and the multi-plate hybrid evaporator technology, we will be in a position to respond to diverse needs with perfect evaporator solutions.

With a tube side, which has a tube-like cross section and is thus similar to the tube-bundle heat exchanger, and a corrugated side with a cross section like that of the plate heat exchanger, this special heat exchanger combines the specific properties and advantages of the two original versions within one single unit.

The basic element of any of the plate-type falling-film evaporators is a plate with a constant width of 360 mm. The length of the plate can vary between 216 and 11,880 mm. With plate thicknesses ranging from 0.3 to 1.0 mm, the deformation depth (stamping depth) can be modified with a multi-functional stamping tool within a range of 2.75 and 5.1 mm. Several plates placed one on top of the other and welded together form one heat-exchanger block. A number of these blocks can be connected in series to meet specific performance requirements.

The block of plates thus produced is connected with side plates and tie bars to form a unit of high pressure resistance. The fully-welded plate block can then be welded into any type of pressure-resistant housing.

When assembling the unit with various adapter plates to form a complete plate heat evaporator, the juice chamber and the steam chamber are separated into two distinct sections. The shell placed around the evaporator with the required reinforcements maintains this separation. Each chamber is provided with connections for medium inlet and outlet and with vent and drain sockets.


The juice to be concentrated in the evaporator is fed into the system by a detachable pipe, which passes it to the juice distribution section. This section mainly serves to calm the juice flow, separate solids, and provide for primary and secondary juice distribution. Secondary juice distribution ensures uniform wetting of the tube-shaped plate cross section.

Juice flow through the series-connected plate blocks is from top to bottom, with no additional distribution systems between the blocks. Uniform distribution of the juice is achieved by the large number of tubes about 5,500 per square meter of contact area between the blocks. The thermal energy required to effect phase change in the tube-side juice solution is generated by heating-steam condensation on the corrugated side and by the propelling force of the temperature gradient between the different media.

Since a predefined liquid level is maintained in the vapor chamber at the bottom end of the evaporator, the vapors produced cannot be extracted through the juice outlet socket.

Customer Benefits

· High energy savings potential
· Improved juice colour due to short retention times
· Low investment cost
· Conversion of existing Robert evaporators to provide up to three times the original heating surface
· Excellent system control due to short reaction times

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