• DOI:10.1007/978-981-10-3827-3
• Corpus ID: 135947379

Combustible Solid Waste Thermochemical Conversion: A Study of Interactions and Influence Factors

@article{Zhou2017CombustibleSW,
  title={Combustible Solid Waste Thermochemical Conversion: A Study of Interactions and Influence Factors},
  author={Hui Zhou},
  journal={Combustible Solid Waste Thermochemical Conversion},
  year={2017}
}

• Hui Zhou
• Published 2017
• Materials Science
• Combustible Solid Waste Thermochemical Conversion

The treatment of combustible solid waste (CSW) is a severe problem around the world. Thermochemical conversion is an effective waste-to-energy (WTE) technology. Based on the cluster analysis of CSW in China, this dissertation selects nine types of basic components (hemicellulose, cellulose, lignin, pectin, starch, polyethylene (PE), polystyrene (PS), polyvinyl chloride (PVC), and polyethylene terephthalate (PET)) to study. The pyrolysis experiments of CSW basic components were carried out in thermogravimetric analyzer (TGA) and self-designed Macro-TGA. Peak analysis-least square method (PA-LSM) was developed to perform kinetic calculations. Complicated pyrolysis reactions could be described by a series of parallel reactions, and the kinetic characteristics of pyrolysis could be reproduced from kinetic parameters accurately. The fast pyrolysis of basic components was carried out in a fixed bed reactor at 800 °C. The product distribution, gas products, and polycyclic aromatic hydrocarbons (PAHs) generation were analyzed. PS and PVC produced the most PAHs. Naphthalene was the most abundant PAH, and phenanthrene and fluorene were the most abundant 3-ring PAHs. PAHs might be generated directly from the aromatic structure for PS, PET, and lignin. PAHs generated from PE might be via Diels– Alder type of reactions. For polysaccharide compounds, PAHs might be generated with benzenes and cyclopentadiene (CPD) as intermediates. Regarding the pyrolysis of lignin and PVC, with the increase in temperature, the molecular mass of tar increased, so did the PAH yields. For the pyrolysis of PVC, HCl yield decreased with the increase in temperature. Slow pyrolysis generated more tar and less PAHs than fast pyrolysis. Gasification in air or CO2 generated less total PAHs than that in N2. NaCl, NaOH, and CuCl2 all had inhibition effect on the production of PAHs. The pyrolysis of lignin started from depolymerization, and then, the secondary reactions (demethoxylation, dehydroxylation, and demethylation) were promoted with the increase in temperature. For the slow pyrolysis of lignin, secondary reactions were unlikely to happen. The pyrolysis of PVC could be divided into two processes: dechlorination and chain scission. In the process of fast