SCT reaction kinetics model and diffusion for p.c. combustion in TGA
SCT reaction kinetics model and diffusion for p.c. combustion in TGA
复制标题
PC 的 SCT 反应动力学模型和扩散
DOI：
10.1002/apj.308
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发表时间：
2010-03
影响因子：
1.8
通讯作者：
Zhou, Huai-Chun
中科院分区：
文献类型：
--
作者：
Fu, Pei-Fang;Zhou, Huai-Chun
近年来，煤焦燃尽过程受到广泛关注。目前普遍采用的全局模型不能预测燃烧后期焦炭的燃尽程度。针对工业煤粉燃尽度预测的需要，建立了煤粉燃尽度预测模型。利用热重分析（TGA）和落管式炉等实验数据，在化学反应动力学简单碰撞理论（SCT）的基础上，推导出SCT模型。印刷线路燃烧被认为是氧分子在P. C表面上撞击和氧化的结果。粒子，有效打击的频率由玻尔兹曼因子决定。撞击和氧化发生在氧可及比表面积（OASA）上。在1200 K以下的温度范围内控制化学状态，在1600 K以上的温度范围内控制分子扩散状态，此时的OASA对应于燃煤锅炉中颗粒孔径大于38 nm的比表面积。PC的OASA随着焦炭的燃烧，颗粒增大，颗粒膨胀、收缩和破裂。基于SCT模型计算的燃烧速率与实验数据吻合较好。版权所有© 2009科廷科技大学和约翰威利父子有限公司。
Recently, the process of char burnout is extensively concerned. Global model used widely cannot predict the extent of char burnout at the later burning stage. For the need of predicting the burnout degree in industrial pulverized coal (p.c.) fired furnace by making use of the experimental data from such as thermogravimetry analysis (TGA) and drop tube furnace, based on the simple collision theory (SCT) of chemical reaction kinetics, the SCT model is educed. The p.c. combustion is considered as the results of strike and oxidation of oxygen molecules on the surface of p.c. particles, and the frequency of effective strike was determined by Boltzmann factor. Strike and oxidation occur on the oxygen accessible specific surface area (OASA). Chemical regime controlled is at temperature below 1200 K, and molecules diffusion regime controlled is at the temperature above 1600 K, at which OASA corresponds to the specific surface area with pore diameter more than 38 nm of p.c particles in coal-fired boiler. The OASA of p.c. particles increases with the char burning, for the particles swells, shrinks and cracks. The burning rates calculated based on SCT model have shown good correspondence with experimental data reported. Copyright © 2009 Curtin University of Technology and John Wiley & Sons, Ltd.
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影响因子：
5.3
作者：
FLETCHER, TH;KERSTEIN, AR;GRANT, DM
通讯作者：
GRANT, DM
影响因子：
29.5
作者：
Eaton, AM;Smoot, LD;Eatough, CN
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作者：
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