Crystallization vacuum evaporator with external heat source

  • Concentrate in semi-solid state
  • No liquid waste
  • Reusable concentrate
  • Usage of excess heat from external process
  • Suitable for highly concentrated inlet solutions
  • Simple design ensures minimal malfuncions
  • Best performace at high volumes of highly concentrated inlet solution
  • Batch operation

Crystallization vacuum evaporators AQUADEST-VR use external source of heat in the form of hot water or hot steam. Vacuum evaporator can use excess heat from another production process. That is the reason why operational costs are very low. Vacuum is provided by ejector jet.

Crystallization vacuum evaporators AQUADEST-VR can be used as a second step of concentration. First step of concentration can be made by using evaporators AQUADEST-D or AQUADEST-K. Concentrate out of these two evaporators can be fed into AQUADEST-VR and further concentrated up to semi-solid state. This sollution achieves highest reduction of concentrate volume.

Semi-solid concentrate can be transformed to solid state crystals using Big-bags. Crystals can be then either reused in the production process or has to be disposed. The leachate from Big-bag is fed back to inlet of crystallization vacuum evaporator. Therefore there is no liquid waste that would need to be otherwise disposed.

Simple design and automatic washing system ensures easy maintenance of the evaporator.

The pressure in the boiling chamber is 6-30 kPa. The boiling point of water is at 35-70 °C. Energy consumption per one liter of distillate starts for heating and cooling 0,72 kWh. AQUADEST-VR doesn't have own production heating elements.

Solution for:

  • Concentrated waste waters
  • Concentrates from membrane separation processes (retentates - Reverse osmosis)
  • Rinse water after quenching in salt baths
  • Waste water containing solid insoluble solution
  • Further concentration of concentrate out of AQUADEST-D and AQUADEST-K

Material options for AQUADEST-VR:

  • Stainless steel 316 L/Ti
  • Super-duplex SAF 2507
  • Nickel alloy 2.4819

Material is always designed with respect to inlet solution.

Technology process

Inlet solution is fed into the boiling chamber, where it heats up through heating jacket. Heating jacket uses external hot water or vapour as a heating medium. The solution doesn't circulate in the boiling chamber.

Evaporated part of the solution rises to the top level of the boiling chamber, where it condenses on the heat exchanger. This heat exchanger uses cold water from external source as a cooling medium. Condensed vapour is called distillate. Disitillate is sucked out of the heat exchanger with a ejector jet into the retention tank. Ejector jet is the only source of vacuum in this evaporator.

Product portfolio

  Distillate production [l/day] Operational performance [kW]
AQUADEST - VR 2 000 2 000 60
AQUADEST - VR 4 000 4 000 120
AQUADEST - VR 6 000 6 000 180
AQUADEST - VR 8 000 8 000 240