SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2023, Vol. 58 ›› Issue (6): 53-68.DOI: 10.1016/j.cjche.2022.10.015

• Full Length Article • 上一篇    下一篇

Thermogravimetric analysis and kinetic modeling of the co-pyrolysis of a bituminous coal and poplar wood

Wei Wang1,2, Romain Lemaire1, Ammar Bensakhria2, Denis Luart3   

  1. 1. Department of Mechanical Engineering, École de technologie supérieure, Montreal, Quebec H3C 1K3, Canada;
    2. Université de Technologie de Compiègne, Centre de recherche de Royallieu, EA 4297-TIMR, BP20529, 60205 Compiègne, France;
    3. École Supérieure de Chimie Organique et Minérale, 1 Rue du Réseau Jean-Marie Buckmaster, 60200 Compiègne, France
  • 收稿日期:2022-06-24 修回日期:2022-10-01 出版日期:2023-06-28 发布日期:2023-08-31
  • 通讯作者: Romain Lemaire,E-mail:romain.lemaire@etsmtl.ca
  • 基金资助:
    This research has received the support of the French Ministry of Higher Education, Research and Innovation (Ministère de l'Enseignement supérieur, de la Recherche et de l'Innovation).

Thermogravimetric analysis and kinetic modeling of the co-pyrolysis of a bituminous coal and poplar wood

Wei Wang1,2, Romain Lemaire1, Ammar Bensakhria2, Denis Luart3   

  1. 1. Department of Mechanical Engineering, École de technologie supérieure, Montreal, Quebec H3C 1K3, Canada;
    2. Université de Technologie de Compiègne, Centre de recherche de Royallieu, EA 4297-TIMR, BP20529, 60205 Compiègne, France;
    3. École Supérieure de Chimie Organique et Minérale, 1 Rue du Réseau Jean-Marie Buckmaster, 60200 Compiègne, France
  • Received:2022-06-24 Revised:2022-10-01 Online:2023-06-28 Published:2023-08-31
  • Contact: Romain Lemaire,E-mail:romain.lemaire@etsmtl.ca
  • Supported by:
    This research has received the support of the French Ministry of Higher Education, Research and Innovation (Ministère de l'Enseignement supérieur, de la Recherche et de l'Innovation).

摘要: The co-pyrolysis of coal and biomass has proven to be a promising route to produce liquid and gaseous fuels as well as specific value-added chemicals while contributing to mitigating CO2 emissions. The interactions between the co-processed feedstocks, however, need to be elucidated to support the development of such a thermochemical conversion process. In this context, the present work covers the kinetic analysis of the co-pyrolysis of a bituminous coal with poplar wood. In this research, biomass was blended with coal at two different mass ratios (10% (mass) and 20% (mass)). Thermogravimetric analyses were carried out with pure and blended samples at four heating rates (5, 10, 15 and 30 ℃·min-1). A direct comparison of experimental and theoretical results (based on a simple additivity rule) failed to yield a clear-cut conclusion regarding the existence of synergistic effects. Kinetic analyses have therefore been achieved using two model-free methods (the Ozawa-Flynn-Wall and Kissinger-Akahira-Sunose models) to estimate the rate constant parameters related to the pyrolysis process. A significant decrease of the activation energy has thus been observed when adding wood to coal (activation energies associated with the blend containing 20% (mass) of biomass being even lower than those estimated for pure wood at low conversion degrees). This trend was attributed to the possible presence of synergies whose related mechanisms are discussed. The rate constant parameters derived by means of the two tested models were finally used to simulate the evolution of the conversion degree of each sample as a function of the temperature, thus leading to a satisfying agreement between measured and simulated data.

关键词: Co-pyrolysis, Coal, Wood, Kinetics, Synergistic effects

Abstract: The co-pyrolysis of coal and biomass has proven to be a promising route to produce liquid and gaseous fuels as well as specific value-added chemicals while contributing to mitigating CO2 emissions. The interactions between the co-processed feedstocks, however, need to be elucidated to support the development of such a thermochemical conversion process. In this context, the present work covers the kinetic analysis of the co-pyrolysis of a bituminous coal with poplar wood. In this research, biomass was blended with coal at two different mass ratios (10% (mass) and 20% (mass)). Thermogravimetric analyses were carried out with pure and blended samples at four heating rates (5, 10, 15 and 30 ℃·min-1). A direct comparison of experimental and theoretical results (based on a simple additivity rule) failed to yield a clear-cut conclusion regarding the existence of synergistic effects. Kinetic analyses have therefore been achieved using two model-free methods (the Ozawa-Flynn-Wall and Kissinger-Akahira-Sunose models) to estimate the rate constant parameters related to the pyrolysis process. A significant decrease of the activation energy has thus been observed when adding wood to coal (activation energies associated with the blend containing 20% (mass) of biomass being even lower than those estimated for pure wood at low conversion degrees). This trend was attributed to the possible presence of synergies whose related mechanisms are discussed. The rate constant parameters derived by means of the two tested models were finally used to simulate the evolution of the conversion degree of each sample as a function of the temperature, thus leading to a satisfying agreement between measured and simulated data.

Key words: Co-pyrolysis, Coal, Wood, Kinetics, Synergistic effects