本发明提供一种反渗透--正渗透--多效蒸馏耦合的海水淡化系统和方法,所述系统包括反渗透海水淡化单元、正渗透单元和高温多效汲取液回收单元。所述的反渗透海水淡化单元用于原海水的初步淡化,所述的正渗透单元用于反渗透海水淡化单元浓海水的二次提浓,所述的高温多效汲取液回收单元用于正渗透汲取液的回收与淡水的产生。本发明可实现工业余热分级利用,同时还可以实现海水淡化淡水回收率的提高与反渗透海水淡化浓海水的深度浓缩。

The invention provides a reverse osmosis-forward osmosis-multi-effect distillation coupled seawater desalination system and method. The system includes a reverse osmosis seawater desalination unit, a forward osmosis unit and a high-temperature multi-effect extraction liquid recovery unit. The reverse osmosis seawater desalination unit is used for the preliminary desalination of raw seawater, the forward osmosis unit is used for the second thickening of the concentrated seawater of the reverse osmosis seawater desalination unit, and the high-temperature multi-effect extraction liquid recovery unit is used for the recovery of osmotic draw fluid and the production of fresh water. The invention can realize the graded utilization of industrial waste heat, and can also realize the improvement of the recovery rate of seawater desalination and the deep concentration of reverse osmosis desalination concentrated seawater.