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Evaporation · Concentration

Evaporation · Concentration

Type of device (classification by energy recovery method)
MVR(Mechanical Vapor Recompression)
1EFFECT
  • Composed of one heat exchanger and one evaporator.
  • Using a heat pump.All of the evaporated waste vapor is sucked and compressed and reused
  • About 90% of waste steam is recovered and reused.
  • Application review is necessary depending on the characteristics of the waste fluid.
Video of Kovec's Self-Cleaning MVR System, Patented Technology
FFE (Fallling Film Evaporation)
FCE (Forced Circulation Evaporation)

Falling Film type Evaporation with Self Cleaning Technology (Kovec's patented product)

Type Falling Film Evaporation (FFE) MVR System Self Cleaning Technology (SCT) MVR System
Facility configuration diagram
Features
  • A single-row, vertically arranged multi-tube heat exchanger is configured.
  • Wastewater is distributed from the top by a circulation pump and supplied to the heat transfer tubes.
  • The wastewater naturally flows as a thin film and evaporates.
  • The heat transfer tubes are divided into multiple zones (6-8).
  • One zone is switched to ascending heat transfer (cleaning circulation) and the remaining zones operate as descending heat transfer (thin-film flow).
  • Scaling is controlled through alternating operation of ascending and descending heat transfer tubes(switching according to time sequence).
Pros & Cons
  • The thin liquid surface provides low thermal resistance.
  • Gravity flow facilitates scale adhesion.
  • It is highly unfavorable for concentrating high-concentration, high-viscosity solutions.
  • Continuous cleaning during operation allows for scale control.
  • Selectable thin-film flow and forced circulation modes are available.
  • Higher concentrations are possible compared to existing facilities.
  • Slightly more expensive than typical thin-film flow (FF) systems.
2EFFECT
  • 2 Two-stage composed of 2 heat exchangers and 2 evaporators.
  • Gereratated waste steam in the second stage is used in the first stage, and all waste vapor generated in the first stage is reused in the second stage after inhaled and compressed.
  • About 95% of waste steam is recovered and reused.
  • Depending on the BPR(Boiling Point Rising) of the waste liquid, a heat pump with a high compression ratio is required.