Today the flash evaporator is the most cost-effective type of evaporator regarding the operation cost.
Unlike conventional circulation evaporators with one heater circuit per stage, the flash evaporator has several stages and heaters which are installed circulatory; however the investment cost are quite considerable and this type of evaporator is suited for operation capacities of more than abt. 5 t/h.
The solution may be fed into any stage of the evaporator and also drained from any stage, i.e. in EBNER plants the outlet temperature is allowed to be higher than the inlet temperature. The specific steam consumption of flash evaporation plants is low. The consumption depends on both, the number of stages and the total temperature drop in the evaporator stages.