Abstract
A series of gasification experiments of sludge RDF was made by using independently developed gasification device. When sludge RDF was gasified at 300°C ~900°C, the trend of gas production was increased continuously with the peak of 65.5% at 900°C and the trend of bottom ash decreased continuously with the peak of 25.6% at 900°C, but tar yield firstly increased and then decreased, reaching maximum at 600 °C, about 31%. With the increase of the gasification temperature, combustible gas content of CO2 decreased significantly, while H2 , CO and CH4 increased. At 500 °C, heavy metal of Hg entirely evaporated into the atmosphere, volatile peak of Pb, Cd, As, Cu was in 800°C, volatile sort of 8 heavy metals was : Hg>Pb>Cd> As>Zn>Cu>Cr>Ni. The optimal gasification temperature for sludge RDF is 700 °C when the volatilization rate of heavy metals was moderate, gas production was higher and tar produced was smaller.
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