Vapor-compression evaporation

The vapor compression is a type of construction for heating and cooling of a distillation column (for more details see oil refinery ) or an evaporator.

In distillation columns, heat is supplied to vaporize one or more substances selected from a substance mixture in the sump. In the header heat is removed to condense the vapors.

Since the vapors due to the different composition has a lower dew point than the boiling point of the swamp, the taken off at the top of the column heat can not be used directly for heating the bottom.

In the vapor compression the vapor is condensed. Thereby, the temperature rises over the boiling point in the sump of ( driving temperature difference ), and the condensation heat is used to vaporize.

The vapor compression is used only if no cheaper hot steam is available, it must be there for the compression driven a large expenditure on equipment and used a lot of electrical energy ( mechanical vapor compression ).

Also in sugar production, the method is used in the multi-stage evaporation plant for use. In this case, the vapor from the last evaporator stage, which must be condensed useless otherwise, enhanced with the help of higher-grade propellant vapor ( between removal from the turbine factory ) using a jet compressor to the Heizdampfqualität the first evaporator stage (thermal vapor recompression ).

• Process engineering
• Steam technology