Multi-effect evaporation concentrator

 The heat released by 1kg steam condensation is  basically the same as the heat absorbed by evaporation of 1kg water, Therefore to  single-effect evaporation, 1kg water in the  material for evaporation will consume 1kg live steam ; if the secondary steam is used to heat up the steam for the next effect,  the  consumption of  secondary steam and live steam will be cut down  by 50% . When the number of effect increases, steam consumption decreases while the investment in  equipment  increases subatantially.Therefore usually it shall not be more  than 5 effects.