基于能耗和膜耗的反渗透海水淡化系统的成本分析

Cost evaluation based on energy and membrane consumption for sea water reverse osmosis system

反渗透系统是膜法海水淡化的核心,其成分分析是建设、生产运行过程中重点评估的对象.结合一级反渗透系统,提出一种数模分析方法,分别以系统比能耗和单位水成本为优化目标函数,分析反渗透系统的优化工况.结果表明不同系统回收率条件下,单位水成本随膜过水通量的增加存在一最小值.相较于以系统比能耗作为优化目标函数的运行工况,以单位水成本作为优化目标函数的运行工况,其单位水成本低65%.提出的单位水成本分析方法能够为反渗透海水淡化系统设计及生产运行实践提供有益的指导.

Reverse osmosis system is the key component of the seawater desalination using membrane separation method.The cost evaluation is necessary on construction and maintenance of reverse osmosis system.This study established a mathematical model for a single-pass reverse osmosis system.The mathematical model was computationally optimized based on the specific energy consumption minimization and the cost minimization per unit produced desalinated water,respectively.The results indicated that there existed a minimum cost per unit produced desalinated water with increasing the water flux of reverse osmosis membrane under various recoveries.Compared with optimization based on the specific energy consumption minimization,that based on the cost minimization was less than 65%cost per unit produced desalinated water.The established analysis method introduces a beneficial reference for reverse osmosis system design and operation.