REDUCTION OF DIOXIN EMISSIONS FROM COPPER SMELTING PLANT FOR SLUDGE RECYCLING
Secondary non-ferrous smelting is important with saving up to 95 ％ energy compared with primary smelting, but PCDD/F emission is a serious problem especially for copper smelting plants. Activated carbon injection (ACI) + fabric filter (FF) is considered as one of the best available control technologies for dioxin removal. In this study, flue gas samplings were conducted at different sampling points of a copper smelting plant to evaluate the PCDD/F formation potential and removal efficiency with different copper contents of input material (sludge) and AC injection rates. The results indicate that PCDD/Fs are formed significantly via de novo synthesis and solid-phase PCDD/Fs dominate (over 80％) before FF. The operating temperature in secondary burner (619 ～ 683 ℃) is not high enough for effective PCDD/F destruction, with the PCDD/F removal efficiency range from 17.6％ to 38.5％. Before the retrofit of FF, the particle removal efficiency of FF was between 92.7 ％ and 95.5 ％ and the PCDD/Fs emission was higher than 1.0 ng I-TEQ/Nm3 which is the PCDD/Fs emission standard for this industry set by Taiwan EPA. High PCDD/F formation and low particle removal efficiency are considered as the main causes leading to the relatively high PCDD/F emission. After the retrofit of existing FF, the particle removal efficiency achieved with FF is increased to over 97 ％, with PCDD/F concentrations in the stack gas ranging from 0.1 to 0.7 ng I-TEQ/Nm3.
Hung PC Chang SH Chang MB
Graduate Institute of Environmental Engineering,National Central University,Chungli 320
国际会议
北京
英文
1-6
2009-08-24（万方平台首次上网日期，不代表论文的发表时间）