What is Mechanical vapor Recompression working principles?

 

Mechanical vapor recompression evaporator referred to as MVR. The system includes a warm-up phase, the stages are include below:-

 The feed Preheating stages are steam plate heat exchanger, Distilled water plate heat exchanger, filter, feed pump, distilled water.

FallingFilm Evaporation stages separator, circulation pump, circulation evaporator.

Forced Circulation Evaporation Stage Crstal separator, forced circulation evaporator circulation pump.

Centrifugal separation Stage Thickener centrifuge, mother liquor tank.

The first step of the MVR system is:
 

1.       We have to feed through the feed pump after that material is transported to the filter it removes the impurities after that, the material is heated by distilled water plate heat exchanger in that after this process preheat the material to evaporation temperature, the evaporator enters the falling film evaporation stage. The material is first transported to the distributor through the falling film circulation pump, after being evenly distributed, it flows into the falling film heat exchanger tube and flows like a film its shell pass through the second steam heating the vapor flow down the tube in form of liquid in to the bottom of the falling film evaporator. The material which is in the gas liquid are in mixed state enters the falling film separator for gas-liquid separation.

 

2.       The material reached the design concentration in the falling film evaporation stage through the force material is transfer in circulation evaporation, the material is saturated after concentration until a small number of crystals are produced in the secondary steam which is generated in the falling film evaporation stage and forced evaporation stage.

 

 

3.       It passes through centrifugal vapor compressor after passing through it. It is transported to the shell side of the forced circulation heat exchanger and falling film heater in the Fallin film heater heating material evaporates through forced circulation after reaching design solid liquid content in to the thickener. The thickener does sedimentation and thickening of the material.

 

 

4.        The supernatant overflows to the mother liquor tank the material with higher solid content at the bottom of the thickener enter the centrifuge for solid- liquid separation it forms the solid salt than centrifugal mother liquor enters mother liquor tank, the mother liquor is heated and returned to the forced circulation through the mother liquor lift pump process continue to evaporate and crystallize.