Gasification of plastic waste as waste-to-energy or waste-to-syngas recovery route — Oak Academic Publishing
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Gasification of plastic waste as waste-to-energy or waste-to-syngas recovery route
Department of Chemical Engineering, Chemical and Biochemical Process Technology and Control Section, Katholieke Universiteit Leuven, Heverlee, Belgium
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Department of Chemical Engineering, Chemical and Biochemical Process Technology and Control Section, Katholieke Universiteit Leuven, Heverlee, Belgium
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College of Life Science and Technology, The Key Laboratory of Bioprocess of Beijing, Beijing University of Chemical Technology, Beijing, China
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College of Life Science and Technology, The Key Laboratory of Bioprocess of Beijing, Beijing University of Chemical Technology, Beijing, China
1 Department of Chemical Engineering, Chemical and Biochemical Process Technology and Control Section, Katholieke Universiteit Leuven, Heverlee, Belgium
2 Department of Chemical Engineering, Chemical and Biochemical Process Technology and Control Section, Katholieke Universiteit Leuven, Heverlee, Belgium
3 College of Life Science and Technology, The Key Laboratory of Bioprocess of Beijing, Beijing University of Chemical Technology, Beijing, China
4 College of Life Science and Technology, The Key Laboratory of Bioprocess of Beijing, Beijing University of Chemical Technology, Beijing, China
The disposal of plastic solid waste (PSW) has become a major worldwide environmental problem. New sustainable processes have emerged, i.e. either advanced mechanical recycling of PSW as virgin or second grade plastic feedstock, or thermal treatments to recycle the waste as virgin monomer, as synthetic fuel gas, or as heat source (incineration with energy recovery). These processes avoid land filling, where the non-biodegradable plastics remain a lasting environmental burden. Within the thermal treatments, gasification and pyrolysis gain increased interest. Gasification has been widely studied and applied for biomass and coal, with results reported and published in literature. The application to the treatment of PSW is less documented. Gasification is commonly operated at high temperatures (> 600 ℃ to 800 ℃ ) in an air-lean environment (or oxygen-deficient in some applications): the air factor is generally between 20% and 40% of the amount of air needed for the combustion of the PSW. Gasification produces mostly a gas phase and a solid residue (char and ashes). The use of air introduces N 2 in the product gases, thus considerably reducing the calorific value of the syngas, because of the dilution. The paper will review the existing liter ature data on PSW gasification, both as the re sult of laboratory and pilot-scale research. Processes developed in the past will be illustrated. Recently, the use of a sequential gasification and combustion system (at very high temperatures) has been applied to various plastic-containing wastes, with atmospheric emissions shown to be invariably below the legal limits. Operating results and conditions will be re viewed in the paper, and completed with recent own lab-scale experimental results. These results demonstrate that gasification of PSW can be considered as a first order reaction, with values of the activation energy in the order of 187 to 289 kJ/mol as a function of the PSW nature.
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