4.7 Article

Pyrolysis and combustion kinetics of lignocellulosic biomass pellets with calcium-rich wastes from agro-forestry residues

Journal

WASTE MANAGEMENT
Volume 87, Issue -, Pages 86-96

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2019.02.009

Keywords

Pyrolysis; Combustion; Agro-forestry residue; Calcium waste; TGA; Catalytic kinetic

Funding

  1. Startup Foundation for Introducing Talent of NUIST [2243141501046]
  2. National Natural Science Foundation of China [21607079]
  3. Natural Science Foundation of the Jiangsu Higher Education Institutions of China [16KJB610012]
  4. Six Talent Peaks Project in Jiangsu Province of China [JNHB-057]

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The pyrolysis and combustion kinetics of biomass pellets (i.e., rice husk, herb residue, and wood residue) with the calcium-rich wastes (i.e., CaO, CaCO3, and eggshell) from agro-forestry residues were comparatively studied. During pyrolysis or combustion of biomass, the Ca-rich wastes could slightly influence the decomposition rate in the stage of devolatilization at relatively lower temperatures (e.g., <400 degrees C). However, the lignin decomposition and the char combustion were obviously influenced by the calcium-based catalysis at higher temperatures (>700 degrees C). Particularly, the eggshell had a lowest activation energy in the stage of char combustion. The presence of alkali and alkaline-earth metals (AAEMs) in the eggshells might have positive effects on volatile and char combustion. During the combustion, the decomposition temperatures of CaCO3 and eggshell were decreased, thereby favoring to uptake CO2. Furthermore, by identifying the small molecular products, it was found that both CaCO3 and CaO can improve the pyrolysis of RH, but CaCO3 showed better performances, especially on CO2 capture at lower temperatures and on the enhancement of CO production. (C) 2019 Elsevier Ltd. All rights reserved.

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