传统多效蒸发器Traditional multiple effect evaporator
Connect several evaporators in serial to use heat energy of steam for more time and increase heat energy utilization and mostly used for dealing with water solution.
Multiple evaporation is evaporation process by several evaporators. Operating pressure and boiling point of solution of the second effect should be lower than first effect. Second steam of first effect can be heating medium for second effect which means heating chamber of second effect is the condenser of second steam from first effect. Only first effect need fresh steam. Usually the last effect or last several effects are operated under vacuum. Second steam of every effct will be used as heating steam for the next effect so efficiency of fresh steam has been increased.
Multiple evaporation capacity is in positive ratio with heating transfer capacity. Only steam will be saved under multiple evaporation, evaporation capacity will not be increased and equipment investment will be increased.
1）蒸发浓缩evaporation and concentration
2）蒸发结晶evaporation and crystallization
3）低温蒸发low temperature evaporation