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<p>The combustion of tobacco segments (including leaves and stems) is investigated using thermogravimetric analysis and fire propagation apparatus under varying heating conditions. The thermal pyrolysis experiments are conducted at three heating rates (10, 15 and 20&#xa0;°C/min) in a mixed nitrogen and oxygen atmosphere. The kinetic analysis is carried out by applying the Flynn-Wall-Ozawa method, which reveals that tobacco stems exhibit significantly higher activation energy compared to the leaves. The activation energy (<i>E</i><sub><i>a</i></sub>) of various stem-leaf mixtures ranges from 108 to 215&#xa0;kJ/mol, with a linear relationship between <i>E</i><sub><i>a</i></sub> and stem contents. Additionally, several combustion characteristics, including ignition time, effective heat of combustion (EHC), mass loss rate, smoke production rate and CO/CO<sub>2</sub> generating rates, are analyzed at external heat flux 15 and 25 kW/m<sup>2</sup>. The various loss or production rates are found to be influenced by the external heat flux, generally with an increase occurring at higher fluxes and higher stem loadings. These findings provide valuable insights into establishing a method to accurately determine the uniformity of tobacco components, underscoring tobacco segments as promising and sustainable feedstock.</p>

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Kinetics and combustion characteristics of tobacco waste: impact of stem and leaf proportions

  • 期刊论文

  • 发表日期：

    2026年1月10日

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  • Sixiang Zhai,
  • Wenwen Tian,
  • Tianwei Zhang,
  • Feng Xu,
  • Ruoxin Wu,
  • Hongyu Ye,
  • Zhong-Yong Yuan

摘要

The combustion of tobacco segments (including leaves and stems) is investigated using thermogravimetric analysis and fire propagation apparatus under varying heating conditions. The thermal pyrolysis experiments are conducted at three heating rates (10, 15 and 20 °C/min) in a mixed nitrogen and oxygen atmosphere. The kinetic analysis is carried out by applying the Flynn-Wall-Ozawa method, which reveals that tobacco stems exhibit significantly higher activation energy compared to the leaves. The activation energy (Ea) of various stem-leaf mixtures ranges from 108 to 215 kJ/mol, with a linear relationship between Ea and stem contents. Additionally, several combustion characteristics, including ignition time, effective heat of combustion (EHC), mass loss rate, smoke production rate and CO/CO2 generating rates, are analyzed at external heat flux 15 and 25 kW/m2. The various loss or production rates are found to be influenced by the external heat flux, generally with an increase occurring at higher fluxes and higher stem loadings. These findings provide valuable insights into establishing a method to accurately determine the uniformity of tobacco components, underscoring tobacco segments as promising and sustainable feedstock.