Mechanical Vapour Recompression (MVR) Evaporator
Engineering and Manufacturing Evaporators for Chemical Process Industries
Mechanical Vapour Recompression (MVR) Evaporator
MVR evaporators use electricity or a gas turbine to drive a compressor that recycles the heat in the evaporator. This energy-efficient, cost-saving system has made MVR evaporators increasingly popular as energy costs continue to rise.
Benefits of Mechanical Vapour Recompression Evaporators
• Significant energy and cost savings
• Ideal for low boiling-point rise liquids
How Mechanical Vapour Recompression Evaporators Work
The principle behind mechanical vapor recompression (MVR) evaporators is simple. Vapour from an evaporator is compressed (with a fan or compressor) to a higher pressure so that it can be condensed in the evaporator heat exchanger.
The compression ratio required is comprised of three
components which are:
- The boiling-point rise, i.e., the temperature of the boiling liquor minus the temperature of boiling water at the same pressure
- The Delta-T required for heat transfer
- The pressure drop in the vapour pipe to and from the compressor
Mechanical recompression works best in a system with low boiling point elevation and where larger heat transfer surfaces can be used to lower the differential temperatures in the heat exchanger.
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