Study on Heavy Metals Conversion Characteristics During Refused Derived Fuel Gasification Process

RDF (Refused Derived Fuel) is recognized as one of the most promising renewable energy due to low heating value fuel of hydrogen-rich synthesis gas can be generated during its gasification process. But the main problem related with the use of RDF gasification processes is the heavy metals conversion. The objective of this study is to investigate the heavy metals conversion characteristics during RDF's pyrolysis and gasification process. Experiments were carried out by a two-stage reactor under a temperate range from 600 ̊C to 750 ̊C. The effect of oxygen presenting and catalyst using on heavy metals conversion was studied. The results showed that with the increase of temperature, the heavy metals migrate into tar and liquid products, leading to the decrease of the heavy metals residue in char. The residual of Cd in char are less than Cr, Cu, Pb and Zn. Moreover, the addition of oxygen makes more heavy metals fixed in char. The study also found that the Ni-Ca catalyst supported by γ-Al2O3 can absorb the heavy metals effectively, which reduce the amount of the heavy metals emission.