Multi-effect evaporation and concentration system

The utility model provides a multi-effect evaporation concentration system, which comprises at least one group of external circulation type high-efficiency evaporators which are connected in series with a falling film evaporator through a pipeline, and the falling film evaporator is arranged at the last effect of the series system; an air outlet end of a first evaporation chamber of the external circulation type efficient evaporator is communicated with an air inlet of a second heater of the falling film evaporator through a pipeline, and a discharge port of the external circulation type efficient evaporator is communicated with a feed port of the second heater of the falling film evaporator through a pipeline; an external circulation type efficient evaporator and a falling film evaporator are combined, the evaporation mode that spraying is combined with falling film is adopted by the external circulation type efficient evaporator, the vaporization space is enlarged, the flow of materials is not specially lim