燃煤电厂高盐废水深度浓缩处理系统设计及技术经济分析

System Design and Technical Economic Analysis of Different Concentration Technologies of High Salinity Wastewater in Coal-fired Power Plant

某电厂废水经过梯级利用和浓缩处理后产生50 m3/h的高盐废水,为了实现全厂废水的'零排放',高盐废水需要进行深度浓缩处理.现有的高盐废水浓缩减量处理工艺较多,且各具特点,在工程应用时需要根据具体情况进行技术经济对比论证.以具体项目为例,分别介绍碟管式反渗透(disc-tube reverse osmosis,DTRO)、 间壁式反渗透(space-tube reverse osmosis,STRO)、电渗析(electrodialysis,ED)、正渗透(forward osmosis,FO)、 蒸汽机械压缩蒸发(mechanical vapor compression,MVC)、低温烟气蒸发等深度浓缩技术,并对以上工艺系统进行优化设计,在此基础上进行技术经济对比分析,为燃煤电厂高盐废水深度浓缩处理工艺的选择提供依据.从系统投资和运行成本角度看,低温烟气蒸发工艺运行成本较低.

After reuse and concentration treatment,50 m3/h of high salinity wastewater could be expected in a coal-fired power plant.To achieve zero liquid discharge of wastewater,the high salinity wastewater should be concentrated.High salinity wastewater concentration technologies have various application effects that should be analyzed and discussed before implementation.Disc-tube reverse osmosis(DTRO),space-tube reverse osmosis(STRO),electrodialysis(ED),forward osmosis(FO),mechanical vapor compression(MVC)and low temperature flue gas evaporation were all estimated in technical and economic aspects with a project.Based on the comparisons of the mentioned wastewater concentration technologies,the most reasonable concentration technology in coal-fired power plants could be obtained.The low temperature flue gas evaporation technology has the lowest invest and operation cost.