旋风炉掺烧铬渣污染物排放特性分析

摘要

The emission test of flue gas pollutants from a 260 t/h cyclone furnace was obtained.Then the fly ash and bottom slag from cyclone furnace doped chromium slag was analyzed by XRD,XRF,respectively.The heavy metals solidification effect of Cr(Ⅵ) and Hg were investigated.The results showed that pollutants emission concentration of dust,SO2 and CO were very high,so they need to be controlled again.The concentrations of Hg and Cr (Ⅵ) decreased obviously,were 6.77,94.7 mg/kg,respectively,and the toxic hexavalent chromium concentration decreased by 97.5％.Combined with XRD analysis,during the burning of chromium slag in the cyclone furnace,most of heavy metals (Hg and Cr(Ⅵ)) released into flue gas and fly ash mainly by volatilization and mineral reactions of chromium slag and raw coal.The minerals of Cr were not detected in bottom slag obviously.%针对260t/h旋风燃烧炉机组进行烟气污染物排放测试,并通过旋风炉掺烧铬渣后对其飞灰、底渣进行XRD、XRF分析,考察对重金属Cr(Ⅵ)、Hg的固化效果.结果表明:烟尘、SO2、CO排放浓度偏高,需进一步改造处理;旋风炉掺烧铬渣飞灰中Hg、Cr(Ⅵ)的浓度分别为6.77,94.7 mg/kg,其中有毒Cr(Ⅵ)浓度显著降低,下降了97.5％;结合XRD分析可知,掺烧铬渣过程中,大部分重金属Hg、Cr(Ⅵ)主要靠挥发和通过铬渣与原煤中矿物质相互反应生成化合物释放到烟气和飞灰中,而底渣中未检测出明显的含Cr矿物质存在.