Study On A Two Gas Inlets Plasma Torch As Disposer Of Fly Ashes From Municipal Wastes Incinerators

In recent years, thermal plasma technology has been employed in a wide range of application of industry, and draws more and more people's attention. It also can be used for Municipal waste incineration fly ash treatment. Compared with the traditional heat treatment methods, thermal plasma technology has a much higher temperature and energy density, which helps vitrification of fly ash and inhabitation of heavy metals migration.In this study, several electric characteristics of the thermal plasma furnace, the core of which was a specially designed two gas inlets double anode plasma torch, were examined by classical means, such as statistic method, fast Fourier transform, etc. This research reveals that the design of two gas inlets weakens the pulsation of plasma arc. Employing the thermal plasma furnace, the fly ash samples collected from a local municipal solid waste incinerator were lessened. What's more, the microstructures and crystalline phases of the produced slag are obviously superior to the original ash. Through employing the thermal plasma treatment, toxicity characteristic leaching procedure results show that the slag has an excellent resistance against leaching of heavy metal ions, as Cd, Cr, Nr, Pb cannot be detected. Muffle furnace have been introduced to dispose the same fly ash as a comparison. The disposing time of the thermal plasma technology is much shorter than that of the muffle furnace disposition and heavy metal immobilization rate has increased. These results indicate that the thermal plasma disposition is an alternative technology with highly efficiency to dispose MSWI fly ash.