燃煤机组全厂废水零排放技术方案分析

Study on wastewater zero discharge technical scheme for coal-fired power plants

燃煤机组全厂废水零排放是目前环保工作的重点。结合燃煤电厂废水排放及水处理系统设施、工艺的现状,对如何实现全厂废水零排放进行了研究、分析。试验结果表明,通过优化废水处理系统,可以对各类废水进行分类和梯级利用:将反渗透浓水作为脱硫系统补给水,进而减少废水排放量,提高废水回用率;对无法回用的脱硫废水采用蒸发结晶、烟道蒸发的零排放工艺进行处理,可实现全厂废水零排放。废水零排放具有良好的社会效益和环境效益。

Wastewater zero discharge from thermal power plants is key to environmental protection at present.How to realize the zero discharge of wastewater from coal-fired power plants is analyzed considering existing wastewater treatment facilities and processes.The results show that all kinds of wastewater can be classified and utilized step by step by optimizing the wastewater treatment system.Reverse osmosis concentrated water can be used as supplementary water of desulfurization system so as to reduce the wastewater discharge and improve its reuse rate.Desulfurization wastewater that cannot be reused is processed by evaporative crystallization and flue gas evaporation,which achieves overall wastewater zero discharge.This scheme is of social and environmental benefits.