TVR Evaporators
Evaporators / Falling Film Evaporators
TVR evaporators use thermal vapor recompression to recompress a portion of the vapor from the vapor separator and mix it with the steam to heat the first stage.
Process for TVR evaporator
Thermal Vapor Recompression (TVR) normally takes place across one or more stages by utilizing medium or high pressure steam in an ejector which recycle a portion of the vapor from the vapor separator and mixing it with the steam. This mixture is used for heating of the first evaporation stage.
The steam consumption for a TVR evaporator will vary between approx. 0.3 - 0.07 kg steam per kg water evaporation depending on the number of stages over which the recompression takes place.
This design provides for less costly machinery than straight steam heated designs but requires motive steam pressure.