Plastic waste elimination by co-gasification with coal and biomass in fluidized bed with air in pilot plant

Treatment of plastic waste by gasification in fluidized bed with air using dolomite as tar cracking catalyst has been studied. The gasifier has a 1 m high bed zone (diameter of 9.2 cm) followed by a 1 m high freeboard (diameter of 15.4 cm). The feedstock is composed of blends of plastic waste with pine wood sawdust and coal at flow rates of 1–4 kg/h. Operating variables studied were gasifier bed temperature (750–880 °C), equivalence ratio (0.30–0.46), feedstock composition and the influence of secondary air insertion in freeboard. Product distribution includes gas and char yields, gas composition (H2, CO, CO2, CH4, light hydrocarbons), heating value and tar content in the flue gas. As a result, a gas with a medium hydrogen content (up to 15% dry basis) and low tar content (less than 0.5 g/mn3) is obtained.

[1]  W. Kaminsky,et al.  Olefins from polyolefins and mixed plastics by pyrolysis , 1995 .

[2]  V. Cozzani,et al.  Influence of Gas-Phase Reactions on the Product Yields Obtained in the Pyrolysis of Polyethylene , 1997 .

[3]  M. Mastellone,et al.  Defluidization phenomena during the pyrolysis of two plastic wastes , 2000 .

[4]  F. Pinto,et al.  Co-gasification study of biomass mixed with plastic wastes , 2002 .

[5]  Stefan Czernik,et al.  Fast pyrolysis of plastic wastes , 1990 .

[6]  J. Kuipers,et al.  Experimental Determination of the Yield of Pyrolysis Products of Polyethene and Polypropene. Influence of Reaction Conditions , 1998 .

[7]  Valerio Cozzani,et al.  Kinetic modeling of polyethylene and polypropylene thermal degradation , 1997 .

[8]  Eric D. Larson,et al.  Effect of Fuel Moisture Content on Biomass-IGCC Performance , 1998 .

[9]  José Corella,et al.  Biomass Gasification: Produced Gas Upgrading by In-Bed Use of Dolomite , 1997 .

[10]  C. M. Kinoshita,et al.  Experimental analysis of biomass gasification with steam and oxygen , 1992 .

[11]  José Corella,et al.  Hot gas cleaning and upgrading with a calcined dolomite located downstream a biomass fluidized bed gasifier operating with steam-oxygen mixtures , 1997 .

[12]  J. Brandrup,et al.  Recycling and Recovery of Plastics , 1996 .

[13]  Javier Herguido,et al.  Steam gasification of lignocellulosic residues in a fluidized bed at a small pilot scale. Effect of the type of feedstock , 1992 .

[14]  M. Aznar,et al.  Biomass Gasification in Fluidized Bed at Pilot Scale with Steam−Oxygen Mixtures. Product Distribution for Very Different Operating Conditions , 1997 .

[15]  W. Woolcock.  Chemistry and industry , 1924 .