本发明提供一种正渗透--多效蒸馏耦合的海水淡化系统和方法,包括低温多效海水淡化单元、正渗透单元和高温多效汲取液回收单元,低温多效海水淡化单元包含多效蒸发室、换热器、冷凝器、预热器,低温多效海水淡化单元对预处理后的海水进行淡化处理,得到淡水以及浓海水；正渗透单元用于低温多效海水淡化单元浓海水的二次提浓；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低温多效浓海水的深度浓缩。

The present invention provides a forward osmosis-multi-effect distillation coupled seawater desalination system and method, including a low-temperature multi-effect seawater desalination unit, a forward osmosis unit and a high-temperature multi-effect extraction liquid recovery unit. The low-temperature multi-effect seawater desalination unit includes a multi-effect evaporation Chamber, heat exchanger, condenser and preheater. The low-temperature multi-effect seawater desalination unit desalinates the pre-treated seawater to obtain fresh water and concentrated seawater. The forward osmosis unit is used as the second part of the low-temperature multi-effect seawater desalination unit for secondary concentration of concentrated seawater. The high-temperature multi-effect extraction liquid recovery unit is used for the recovery of forward osmosis extraction liquid and the production of fresh water. The invention can realize the classified utilization of industrial waste heat and the improvement of the recovery rate of seawater desalination and the deep concentration of low-temperature multi-effect concentrated seawater.