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Combustion Characteristics, Kinetics, and Thermodynamics of Pine Wood Through Thermogravimetric Analysis
Applied Biochemistry and Biotechnology ( IF 3.1 ) Pub Date : 2021-01-08 , DOI: 10.1007/s12010-020-03480-x
Xiaokang Xu 1 , Renming Pan 1 , Ruiyu Chen 1
Affiliation  

The thermal conversion of woody biomass is increasingly critical for the development of the energy processing technologies and fire safety engineering. The combustion characteristics, kinetics, and thermodynamics of pine wood were characterized through a thermogravimetric analyzer in the air atmosphere. There were two apparent peaks in the derivative TG curves for pine wood. The combustion process of pine wood was divided into two stages. Therein, the first stage occurring in the conversion degree range of 0–0.6 may be considered a one-step reaction. It was easier for pine wood to decompose under air than under nitrogen. Moreover, the first stage of pine wood combustion may be characterized by the diffusion model g(α) = [1 − (1 − α)1/3]2. The kinetic modeling showed a good agreement between the predicted and experimental conversion degree curves. In addition, the high comprehensive combustion index of pine wood at 10 K min-1 (6.73 × 10-7 %2 min-2 K-3) showed its great potential for bioenergy generation. Besides, both the value of ΔH and ΔS exhibited similar patterns with the activation energy value versus conversion degree, while the ΔG value almost remained at a positive constant with conversion degree. The average ΔH, ΔG, and ΔS value was nearly equal under different heating rates.



中文翻译:

通过热重分析研究松木的燃烧特性、动力学和热力学

木质生物质的热转化对于能源加工技术和消防安全工程的发展越来越重要。松木的燃烧特性、动力学和热力学通过空气中的热重分析仪进行表征。松木的衍生 TG 曲线中有两个明显的峰。松木的燃烧过程分为两个阶段。其中,发生在 0-0.6 转化度范围内的第一阶段可视为一步反应。松木在空气中比在氮气中更容易分解。此外,松木燃烧的第一阶段可以用扩散模型来表征g ( α ) = [1 − (1 − α ) 1/3] 2。动力学模型显示预测的转化度曲线与实验的转化度曲线之间具有良好的一致性。此外,松材在10 K min -1 (6.73 × 10 -7 % 2 min -2 K -3 ) 下的高综合燃烧指数显示出其巨大的生物能源发电潜力。此外,Δ H和Δ S 的值与活化能值与转化度的关系显示出相似的模式,而Δ G值几乎保持在与转化度的正常数。平均 Δ H、Δ G和 Δ S 不同加热速率下的值几乎相等。

更新日期:2021-01-08
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