The system can be: forward flow, cross flow, counter current, self circulation, forced circulation evaporation process, the number of efficiency is single effect or multi effect, according to different material characteristics, using different evaporation process and equipment material, to achieve continuous feeding, continuous discharge, semi-automatic management. It is suitable for concentrated crystallization of corrosive materials such as dilute sulfuric acid, chlorinated cymbals, acid pickling waste acid, fluoride salt, etc.