干法水泥回转窑共处置滴滴涕废物的示范工程

利用新型干法悬浮预热预分解回转窑对滴滴涕废物进行共处置研究.滴滴涕废物以1t/h的投加速率,从窑尾烟室加入窑系统,比较了未处置废物工况和处置滴滴涕废物工况下烟气、生料、熟料、飞灰中滴滴涕和二 浓度.结果表明:在投加滴滴涕废物工况下,滴滴涕得到有效分解,其销毁率和销毁去除率分别为99.99953%和99.999982%;在处置滴滴涕废物前后烟气二 浓度没有发生明显变化,其浓度排放远低于水泥窑废物处置要求低于0.1ng-ITEQ/Nm3的水平;该水泥生产工艺系统在处置滴滴涕废物时,二 烟气排放因子为0.0396μg/t熟料,熟料排放因子为0.220μg/t;滴滴涕废物处置对炉窑生产,运行工况参数和常规污染排放没有显著影响.

Demonstration study of co-processing of DDT in a preheater/precalciner cement kiln system

Co-processing of DDT2,2-bis(4-chlorophenyl)-1,1,1-trichloroethane] via a modern preheater/precalciner kiln system was characterized.DDT contained waste was fed at the inlet of transition chamber with feeding rate of 1 t/h.Concentration of DDT and PCDD/Fs of flue gas in main stack under co-processing and blank operation was measured.Additionally,the raw meal,clinker and bag filter fly ash during the co-processing operation were sampled for analysis of DDT and PCDD/Fs.The destruction efficiency(DE),destruction and removal efficiency(DRE) for DDT were 99.99953% and 99.999982%,respectively,suggesting DDT was effectively destructed.The average PCDD/Fs concentration of flue gas was 0.014ng TEQ/Nm3,which was greatly lower than the national limit of 0.1ng-ITEQ/Nm3,furthermore,there was no significant change to the PCDD/Fs emission comparing with baseline.Under the co-processing of DDT condition,the PCDD/Fs emission factor for flue gas and clinker were respectively 0.0396μg/t and 0.220μg/t.The comparison of operational parameters and conventional pollutant concentration indicated there was no negative influence on the clinker production during DDT co-processing.