Evaporation


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Falling-Film Evaporator

Our Falling-film-evaporators are universally applicable and especially designed for vapor compression.

The most important features:

  • excellent heat-transition
  • short holding time
  • no overheating
  • minimal operation capacity
  • compact design
  • heating surface up to 5'000 m2
  • product-sided minimal pressure-drop-off

Falling-Film Evaporator with Mechanical Vapor Compression

Mechanical vapor compression uses compressors of various designs (e.g. reciprocating, screw-type, roots-type or axial compressors). During operation, no additional heating steam is usually required. The electric power input is used to repressurize the generated steam to a higher level.

Falling-Film Evaporator with Thermal Vapor Compression

A venture-steam-jet compressor operated with live steam is used for vapor pressurization. Venturi steam compressors are extremely resistant and reliable. Depending on operating conditions, steam savings of up to 50 % can be achieved.

  • functional construction without moving parts, thus very robust and safe
  • 30 to 50 % vapor-economy depending on operating-mode

Multi-Stage Falling-Film Evaporators

Water evaporation generally requires a high energy input. One of the options to reduce or minimize the heat energy requirements are multi-stage evaporators, based on the principle that the vapor produced in the first evaporator is used for heating up the next evaporator and so on. The larger the number of evaporator stages in series, the lower the heating-steam consumption. A three-stage evaporator, for example, requires only half as much heating steam as a single-stage evaporator. The basic investment costs, though, are correspondingly higher.

Natural Circulation Evaporators

Thanks to their straightforward design without any moving parts, these evaporators are extremely robust and safe to operate. They operate by the “thermosiphon” principle, in which no circulation pump is usually required. In the case of solutions with poor heat transmission (e.g. due to higher viscosity), a pump (such as an elbow propeller pump – see diagram) may be required to ensure sufficient circulation.

Forced Circulation Evaporators

In contrast to natural circulation processes, the evaporation will not take place in the heat exchanger tube but at a later stage when the fee product enters the separator (so-called flash vaporization). The pump pressure ensures that the product is not evaporated but just heated up by a few degrees when passing through the heat exchanger tube.