In industrial production, it is common to encounter the need to process a large amount of liquid and vaporize a large amount of water. To save heating steam, multi effect evaporation can be used. Double effect evaporation is a simple form of multi effect evaporation. It is a system that connects two evaporators first and operates them in series. The first effect uses fresh steam, and then the secondary steam generated by the first effect due to heat evaporation enters the second effect as the heat source for the second effect evaporator. Equivalent to steam being utilized twice. To achieve the goal of energy conservation and consumption reduction. Reduced steam consumption and also reduced the condensation of secondary steam evaporated. Therefore, the dual effect steam consumption ratio is generally around 0.57-0.6.
According to the process form, dual effect evaporators can be used in both forward and reverse flow. According to the evaporation form, methods such as falling film, forced circulation, and natural circulation can be used. Design according to different materials.