The morphology evolution of char particles during conversion processes
The morphology evolution of char particles during conversion processes
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DOI：
10.1016/j.combustflame.2020.11.038
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发表时间：
2021-04
影响因子：
4.4
通讯作者：
Cong B. Nguyen;Cong B. Nguyen;Johannes Scherer;M. Hartwich;A. Richter
中科院分区：
文献类型：
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作者：
Cong B. Nguyen;Cong B. Nguyen;Johannes Scherer;M. Hartwich;A. Richter
颗粒形态的变化会影响其轨迹和碳消耗率。因此，本工作研究炭转化过程中颗粒形态的演变。进行颗粒解析瞬态 CFD 计算以估计颗粒密度和体积的变化。针对不同的工艺条件和反应方式，详细研究和讨论了炭颗粒附近和内部发生的复杂物理和化学过程。炭转化研究证实了炭直径和炭密度指数之间的理论相关性。根据有效性因子 η 和碳转化阶段 X C，发现了指数 α 和 β 的新表达式。此外，描述颗粒比表面积发展的随机孔模型已扩展为包括经验相关性 γ，使其适用于不同的反应方案和操作条件。
The change in a particle’s morphology affects both its trajectory and its carbon consumption rate. For that reason, the present work studies the evolution of particle’s morphology during the char conversion process. Particle-resolved transient CFD calculations were performed to estimate changes in particle density and volume. The complex physical and chemical processes taking place in the vicinity and the interior of the char particle were studied and discussed in detail for different process conditions and reaction regimes. The char conversion study confirmed the theoretical correlation between the char diameter and the char density exponent. New expressions were discovered for both exponents α and β, depending on the effectiveness factor η and the stage of carbon conversion X C. In addition, the Random Pore Model, which describes the development of the specific surface area of the particle, was extended to include an empirical correlation γ, making it valid for different reaction regimes and operating conditions.