자동차 분쇄 폐기물의 열분해/가스화/용융 공정에서 발생되는 생성물에 포함된 다이옥신의 분포 특성
Distribution Characteristics of PCDDs/PCDFs in Products Generated from a Pyrolysis/Gastification/Melting Process of Automobile Shredder Residue
The number of automobiles in use is around 15,400,000 and 500,000 of End-of-Life Vehicles (ELVs) are annually generated in Korea. About 80,000 of ELVs are exported and the rest of them are dismantled to recover valuable parts and to send for shredding to recover steel materials. After recovering steel at a shredding factory, the residue (automobile shredder residue; ASR) will be left and could be converted into any fuel forms such as gas, oil, char using pyrolysis or gasification technology. In this study, dioxin concentrations and distributions of isomers which are contained in products (i.e. the yields of gas, oil and char. and melting slag) from ASR pyrolysis, and dioxin concentrations in ASR are also analyzed to compare with products of pyrolysis. In addition, the emission characteristics of dioxin at different air/fuel ratio conditions and the distribution of dioxin concentrations in melting slag are investigated. In results, ASR contains about 6 pg-TEQ/g of dioxins with more chlorinated isomers. Product gas at oxygen existence (gasification) shows 75 times higher concentration of dioxins than that at no oxygen condition (pyrolysis). Oil produced by pyrolysis contains more chlorinated dioxins and char product shows higher dioxin concentration at air existence. All products, gas, oil, and char, tend to include more PCDFs than PCDDs because of lack of oxygen during pyrolysis. The obtained results will be used as basic data for developing pyrolysis, gasification and melting technologies of ASR in future.
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