Our falling film evaporators are universally applicable and especially suitable for vapour re-compression.
The most important features at a glance:
Falling film evaporators with mechanical vapour re-compression
Compressors of various types are used for mechanical vapour re-compression.
In addition to the commonly used axial fans, piston, screw, roots and axial compressors are used. Some types only need the heating steam to start up.
During operation, vaporisation energy is completely supplied via the compressor motor as an electric current.
Falling film evaporator with thermal vapour re-compression
The vapours are compressed with the help of a Venturi steam jet compressor. The compressors are designed for constant operating conditions and their efficiency drops sharply in partial load operation.
Multi-stage falling film evaporator
The evaporation of water comes with a very high specific energy consumption. This is significantly higher than that for the evaporation of solvents.
Multi-stage evaporators are one way to reduce this energy consumption; the vapours exiting the first evaporator are used to heat the second evaporator, the vapours from the second are used to heat the third and so on.
The system’s energy requirement thus decreases with each additional evaporator stage, however the investment costs are correspondingly higher.
System example FFVE
Thanks to its simple design, this evaporator is extremely robust and reliable.
It uses the thermo siphon principle and therefore generally works without a circulation pump. Only for liquids with difficult conditions, such as solids content, crystallization or increased viscosity, must successful circulation be supported with a pump; usually with a pipe arc propeller pump.
Natural circulation evaporators can alternatively be used in conjunction with a circulation pump as evaporation crystallisers.
In contrast to natural circulation, the evaporation does not take place in the heat exchanger tube here, but only when it enters and relaxes in the downstream separator. The product is circulated the heat exchanger by means of a pump. The latter is operated on the product side with slight overpressure, for example by connecting an orifice, so that the liquid flow is heated only by a few degrees without evaporating.
System example FCVE
Thin-film technology includes all thermal processes with mechanically produced thin film. These are particularly well suited to the evaporation of highly viscous media for which conventional systems are not suitable. We offer both classic thin films and special constructions.
The evaporation of the solvent and the subsequent condensation take place in this process by using the hot or cold side of a refrigeration cycle (compressor, refrigerant). Apart from a power connection, the system requires no further energy, such as heating media or cooling water. The energy consumption (heating and cooling energy) is reduced to about 10% compared to a conventional single-stage evaporation.
We offer three different heat pump evaporators as standard systems:
Custom-made products are of course also possible on request.
This type of system offers a number of positive features:
Operation in a vacuum offers further advantages, such as reduced corrosion. It allows the use of heat-sensitive products and, when using of a plastic heat exchanger, the concentration of hydrochloric or hydrofluoric acid is also possible.
EVA - Natural circulation evaporator with heat pump
This type of system is particularly suitable for smaller quantities and simple tasks.
The medium is sucked into the concentration stage via negative pressure and heated there by means of a heat exchanger in which the refrigerant condenses. The medium is thus concentrated to a consistency that is still flowable. The resulting water vapour flows into the condensation stage and is condensed there upon evaporation of the refrigerant. The distillate is discharged through the vacuum system.
System example EVA
CONfix® - Forced circulation evaporator with heat pump
If a medium that tends to form deposits has to be concentrated, then this forced circulation evaporator is the right system. The medium is passed into the expander through a circulation pump via an external heat exchanger. The radiator only performs the warming; evaporation first takes place in the expander, whereby a deposit formation is strongly reduced.
System example CONfix®