Mechanical vapor recompression (MVR) powered evaporator plant consumes less energy

Mechanical vapor recompression (MVR) technology in evaporator plant consumes less energy as compared to conventional evaporator. Hence it reduces overall plant operating cost. In the conventional evaporator, most of the energy in the form of steam generated is either lost or partially utilized. In mechanical vapor recompression process, entire steam is compressed using mechanical pump at higher pressure which creates high heat energy to be used for further evaporation.

Working Principle of Mechanical Vapor Recompression (MVR) Evaporator

Mechanical vapor recompression (MVR) employs the heat pump system, in which the pressure and temperature of steam and the corresponding saturation temperature is increased by mechanical vapor compression. The wastewater is entered from the feed pump in the heat exchanger. The feed heat exchanger is used to heat wastewater by transferring heat from the hot condensate to the feed. The recirculation pump circulates the wastewater from the stripping tank to the orifice plate through the main heat exchanger, and then returns to the stripping tank. The latent heat from the compressed steam is transferred to the wastewater through the main heat exchanger. It flows to the next liquid and vapor separation tank where it is separated. Liquid vapor exits the lower tank and returns to the recirculation pump. The steam flow exits the upper tank and flows into the steam compressor. The steam compressor compresses the steam and delivers it to the main heat exchanger, where the latent heat is transferred to the wastewater in the recirculation circuit.

MVR-DRIVEN-EVAPORATOR-Shachi Engineering

The high-temperature condensate leaves the main heat exchanger and flows into the condensate tank, where the remaining steam is separated. Then the hot condensate is sent to the raw material heat exchanger pump, which is transferred to the raw material wastewater where the sensible heat enters. After reaching the steady state of the target concentration, the concentrated wastewater is discharged from the recirculation loop through the waste water valve.

Significant Energy Savings with Mechanical Vapor Recompression

We offer mechanical vapor compression technology with traditional as well as latest self-cleaning evaporators. In case of self-cleaning evaporator, appx. 41% of the primary energy used can be saved using mechanical recompression. In this process, the vapor coming from the evaporator is compressed to increase its pressure and temperature, and can be used in the shell side of the heat exchanger where it condenses. Thus, the energy used in evaporating the latent heat is recovered and the dependence on primary energy is significantly reduced.

Benefits of Mechanical Vapor Recompression (MVR)

  • Low operation cost
  • High heat transfer performance
  • Compact design
  • Environment friendly
  • Energy efficient
  • No steam and cooling water required

Applications

Oil & Gas
  • Effluent or wastewater treatment
  • Chemicals
  • Salt brine concentration
  • Oil & gas
  • Food & Beverages