燃煤电厂脱硫废水零排放工艺研究

摘要

燃煤电厂在生产过程中会产生大量含SO2的烟气，一般情况下采用湿法脱硫来处理，湿法脱硫需从烟气脱硫系统中外排部分废水以保证FGD（ Flue Gas Desulfurization）的安全性和可靠性。由于脱硫废水属于燃煤电厂的末端废水，具有高含盐量、高腐蚀性等特性，对其进行安全、稳定处理十分必要。介绍了脱硫废水的传统处理以及各种新兴的零排放工艺，重点阐述了蒸发结晶工艺实现脱硫废水零排放的原理和优点，介绍了多效和MVR蒸发结晶工艺在国内外零排放领域的应用现状，分析结果表明对于燃煤电厂产生的脱硫废水，预处理后进入MVR蒸发结晶系统是一种较优的处理方法。%The wet FGD( Flue Gas Desulfurization ) technology was adopted to treat flue dust which contained large amounts of SO2 in coal-fired power plant. In order to ensure the safety and reliability of FGD system,some of the waste water should be discharged. The waste water from FGD system had high salt content and corrosion,so it need further treatment. The traditional desulfurization waste water treatment methods and a variety of zero release technologies were introduced. The principle and advantages of improved evaporation crystal-lization process was investigated. The application of multiple-effect and MVR improved evaporation crystallization processes at home and a-broad was analyzed. The results showed that,the combination of pre-treatment system and MVR improved evaporation crystallization process could realize zero release of desulfurization waster water.