Kinetic study of Huadian oil shale combustion using a multi-stage parallel reaction model
Kinetic study of Huadian oil shale combustion using a multi-stage parallel reaction model
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DOI：
10.1016/j.energy.2015.01.080
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发表时间：
2015-03-15
期刊：
影响因子：
9
通讯作者：
Guo, Wei
中科院分区：
文献类型：
--
作者：
Sun, Youhong;Bai, Fengtian;Guo, Wei
本研究旨在用热重分析方法研究桦甸油页岩有机质的燃烧动力学。由于传质阻力和热滞，颗粒尺寸或升温速度的增加将燃烧过程转移到更高的温度。用Coats法、Redfern法、Starink法和Flynn-Wall-Ozawa法对油页岩燃烧活化能的研究表明，油页岩燃烧过程受多种反应机理控制。为此，将多段平行反应模型和双高斯分布函数引入到这一复杂燃烧过程的分析中。采用沥青、干酪根挥发分、干酪根大分子和非挥发分、固定碳四阶段平行反应模型描述了有机质在油页岩中的燃烧过程。活化能在四个子阶段都有增加的趋势。由Malek方法建立的各分阶段机理表明，干酪根燃烧的第二和第三分阶段均遵循化学反应机理和3DZhuravlev-Lesokin-Tempelman模型，与颗粒大小和升温速率无关。这一发现揭示了干酪根燃烧的内在反应性和热稳定性。(C)2015爱思唯尔有限公司。保留所有权利。
This study aimed to explore the combustion kinetics of organic matter in Huadian oil shale using thermogravimetric analysis. Increases in particle size or heating rate shifted the combustion process to a higher temperature, because of mass transfer resistance and thermal hysteresis. An investigation into activation energy using the Coats and Redfern, Starink, and Flynn-Wall-Ozawa methods indicated that oil shale combustion process is controlled by multiple reaction mechanisms. Therefore, multi-stage parallel reaction model and bi-Gaussian distribution function were introduced into the analysis of this complex combustion process. A four-stage parallel reaction model for bitumen, volatiles in kerogen, macromolecules and non-volatiles in kerogen, and fixed carbon was used to characterize the combustion process of organic matter in oil shale. The activation energies showed an increasing trend for the four sub-stages. The mechanism of each sub-stage established by Malek's method showed that the second and third sub-stages of the kerogen combustion proceeded via chemical reaction mechanisms and the 3D Zhuravlev-Lesokin-Tempelman model regardless of particle size and heating rate. This finding revealed the intrinsic reactivity and thermal stability of kerogen combustion. (C) 2015 Elsevier Ltd. All rights reserved.