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Mechanical vapour recompression (MVR) forced circulation evaporators. RV F Series evaporators

Mechanical vapour recompression (MVR) forced circulation evaporators. RV F Series evaporators

Forced circulation vacuum evaporators

Forced circulation vacuum evaporators

Series RV F represents an innovative evaporating apparatus with mechanical recompression of the secondary steam and using the thermal loops, thus reducing the system power consumption to a minimum (35 kW per m3 of distillate), including to abandon the use of fresh steam and other types of coolants.

In the boiling chamber is maintained vacuum. Generated secondary steam is compressed by a compressor to the pressure of heating steam and used to heat the circulating solution passing through a horizontal heat exchanger-condenser of special design. Having given heat, a secondary steam devaporates (condenses) and is distributed as a distillate. The heat of the distillate is used for heating the solution before entering the boiling chamber also is used to heat the concentrate prior to issuance.

The system is equipped with multiple stages of secondary steam/distillate purification (cleaning), including coalescence separator, the packed bed, fine filters. Provided defoamers, dispensers for additives of various components, automatic flushing system.

Circulation in the system of forced, which provides a high turbulent flow regime phases, and, consequently, greatly increases heat transfer and preclude the emergence of stagnant zones and incrustations on the heating surfaces.

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Advantages:

  1. high energy efficiency, including the handling of large flow rate

  2. minimum operating costs

  3. evaporation of solutions prone to crystallization, formation of deposits and blockages

  4. high purity of distillate

  5. mobility and compactness of the system

Scope of application:

  • chemicals (gas scrubber blow-down, explosives (Nitroglycerin) wastewater, floor washing water, radwaste and etc.)

  • mechanical and surface treatments (moulds release liquids baths, exhausted oil emulsions, quenching baths and etc.)

  • mining and primary metals (wastewater from ore processing, lagoons /ponds wastewater reduction, RO concentrates)

  • oil and gas (refineries concentrate stream wastewater, shale gas frac water, coal gas perforation WW and etc.)

  • food and beverage (small dairy wastewater, water with sugars, RO, DEMI plants concentrate and etc.)

  • biogas and biofuels (gas scrubber biodiesel production, digestate from anaerobic digestion of organic solid waste, waste water and etc.)

  • wastewater from landfill or incineration

  • photovoltaic and microelectronics (acid surface etching solutions, Alkaline etching, IE regeneration and etc.)

Evaporation plant models

Type

Distillate produced

RV F 10

10 000 lt/day

RV F 15

15 000 lt/day

RV F 25

25 000 lt/day

RV F 40

40 000 lt/day

RV F 60

60 000 lt/day

RV F 120

120 000 lt/day

Distinctive features:

High energy efficiency of the system:

Our proposed system is highly energy-efficient due to the secondary vapor recompression and the use of heat exchange circuits. Through the use of a horizontal heat exchanger (condenser), a vapor condensation occurs in the space between the tubes, providing greater heat transfer, thus reducing the load on the compressor, which allows in particular to save energy.

Evaporation of highly polluted solutions prone to crystallization:

The emergence of stagnant zones and the inlay of the walls in a horizontal heat exchanger are excluded, due to the high speed circulation of the solution created by the circulating pump. The velocities correspond to Reynolds numbers (Re > 60000) that provides a high turbulent regime.

Due to the fact that the heat exchanger (condenser) is removed from the zone of boiling that occurs in the chamber, and not on the heating surfaces of the heat exchanger, in contrast to the evaporators with vertical heat exchangers.

Regulation of the process, optimization of heat transfer (exchange):

Since the apparatus maintains fluid circulation, the flow velocity in the pipes and the temperature of the liquid can be adjusted in accordance with the characteristics of the product irrespective of the pre-selected temperature difference, which allows to optimize the heat transfer (exchange). At the same time the circulating pump performs the function of issuing (dispending) the concentrate to the consumer, creating the necessary pressure (head).

System mobility:

All components and assemblies are designed with full ergonomics and compactness. The modularity of the nodes allows quick and convenient installation/dismantling. The system is located in the container.

 

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