Abstract
Gasification and melting processes for municipal solid waste (MSW) now attract much attention, because this type of processes can offer high efficiency in reducing polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs) and coplanar polychlorinated biphenyls (Co-PCBs) along with thermal efficiency. However dioxinxs formation may occur in de novo synthesis at around 300 ℃ in the post-combustion zone. Then, in this research, experiments were carrid out with a fixed bed reactor in order to elucidate the formation mechanism of dioxins from gasification-melting ashes. It was proven that the unberned carbon in gasification-melting ash was the primary source for dioxins in this system.
