水泥窑协同处置危险废物的烟气污染物排放特性研究

Emission characteristics of the flue gas pollutants from the cement kilns when co-processing of hazardous waste

水泥窑协同处置技术能够有效地缓解危险废物(以下简称危废)的处置压力,是一项很有发展前景的危废处置技术。通过监测两座典型的新型干法水泥窑在协同处置危废时窑尾烟气中烟尘、SO2和NOx等污染物的排放浓度,评价两条水泥生产线在协同处置危废时污染物排放浓度能否达标。监测结果表明,水泥窑协同处置危废时烟气污染物浓度均低于《水泥工业大气污染物排放标准》(GB 4915—2013)和《水泥窑协同处置固体废物污染控制标准》(GB 30485—2013)规定的排放限值。同时,两座水泥窑烟气中烟尘、SO2、NOx和HF等污染物的排放因子均低于我国新型干法水泥窑污染物排放的平均值,表明两条水泥生产线窑尾烟气净化系统运行良好。此外,还研究了水泥窑协同处置危废前后二噁英排放毒性当量浓度的变化情况。

Co-processing of hazardous waste in the cement kiln could effectively ease the disposal plight of hazardous waste,and it was an very promising hazardous waste disposal technology.By monitoring the emission concentration of dust,SO2 and NOxin the kiln flue gas in two typical new style dry cement kilns,assessment was conducted to evaluate whether the concentration of pollutants in the two cement production lines could reach the discharge standards when co-processing of hazardous waste.The concentration of pollutants could reach the discharge limits of＂Emission standard of air pollutants for cement industry＂（GB 4915-2013）and＂Standard for pollution control on coprocessing of solid wastes in cement kilns＂（GB 30485-2013）.Furthermore,the emission factors of dust,SO2,NOx,HF and other pollutants were lower than the average of the new style dry cement kilns in China,indicating that the flue gas purification system of the two cement production lines were running well.In addition,the emission toxicity equivalent concentrations of dioxins before and after the co-processing of hazardous waste in the cement kilns were also investigated.