生活垃圾焚烧飞灰水洗脱氯工程化研究与应用

Research and Application of Incineration Fly Ash Dechlorination Project by Washing

生活垃圾焚烧飞灰水泥窑协同处置已成为当下飞灰资源化处置的安全出路,水洗脱氯为其工程应用的关键环节。杭州市某垃圾焚烧飞灰水洗脱氯处置工程设计规模为5×10^4t/a,采用飞灰制浆+水洗+废水物化预处理+机械压缩蒸发(MVR)工艺,水洗后飞灰氯含量<0.9%、含水率<34%,水洗产生的废水经过处理后循环利用,并得到副产品氯化钠和氯化钾。工程运行结果表明,飞灰中氯含量和水灰比是决定工程处理成本的关键因素。

The co-processing of domestic waste incineration fly ash in cement kiln has become the safe way for fly ash disposal,and the dechlorination by washing is the key process.The incineration fly ash dechlorination project by washing was designed with the capacity of 5×10^4 t/a.The combined process of slurrying,washing,physiochemical pretreatment,and mechanical compression evaporation(MVR)was applied and the chlorine content and water content were below 0.9%and 34%,respectively.The wastewater from washing was treated and recycled,and the by-products of sodium chloride and potassium chloride were produced.The operation results show that chloride content and the ratio of water and fly ash are the key factors of operation costs.