Experimental study on high-temperature gasification and melting characteristics of the pyrolysis residue from petrochemical sludge

High-temperature gasification and melting is a promising technology for the harmless disposal and resource utilization of hazardous organic solid wastes. In this study, the high-temperature gasification and melting properties of pyrolysis residues from petrochemical sludge (PRPS) were experimentally investigated. Firstly, the PRPSs in pyrolysis temperatures of 500?700 ?C were prepared. The gasification reactivity of PRPSs was investigated through micropolitics pore structure and Raman spectrum analysis. The results show that the PRPS prepared at 650 ?C has the best gasification reactivity, with both large surface area and more complete porous structure, and more disordered carbon microstructures. Then, based on the PRPS sample prepared at 650 ?C, the effects of the gasification temperature (1100?1400 ?C) and atmosphere (N2, H2O, and CO2) were studied. In the atmosphere of 40 vol.%N2/30 vol.%CO2/30 vol.%H2O, the yield of effective gas (CO+H2) began to decrease when the temperature was above 1200 ?C. With the increase of temperature (1300?1400 ?C), high-density slag of PRPS was observed. At the temperature of 1400 ?C, the highest yield of effective gas (CO+H2), the high-density slag, and the reduction of PRPS were obtained in the atmosphere of 40 vol.%N2/60 vol.%CO2. In this condition, the high CO is conducive to form FeO as fluxing. Moreover, the stable mineral phases (CaSiO3, CaSi2O7, etc.) were detected, which should perform a good solidification effect of heavy metals in the slag.

Automated summary

In this study, the high-temperature gasification and melting properties of pyrolysis residues from petrochemical sludge were experimentally investigated. It was found that PRPS prepared at 650℃ exhibited the best gasification reactivity. Under specific atmosphere conditions, the highest yield of effective gas and high-density slag could be obtained.