ARRANGEMENT FOR EVAPORATING LIQUIDS

摘要

The present invention relates to an arrangement for evaporating a liquid, such as black liquor, comprising at least a vapor compression evaporation plant including at least one heat transfer surface unit and a vapor pressure increasing device, and a multi-effect in-series connected evaporation plant, each evaporation effect of which comprises at least one heat transfer surface unit and which has conduits for leading a liquid from one evaporation heat transfer unit into another unit and conduits for feeding vapor into each of the units and for discharging therefrom the vapor generated in the evaporation of the liquid. A unit of the vapor compression evaporation plant and one unit of the multi-effect in-series connected evaporation plant are coupled so that vapors generated in the units in the evaporation of the liquid are led into a common space that is connected to at least a device for increasing vapor pressure for leading a portion of the vapor therein and for returning it after the pressure increase into the unit of the vapor compression evaporation plant as heating medium. A second portion of the vapor can be led into a next effect of the multi-effect in-series connected evaporation plant.