Study on thermochemical kinetic characteristics and interaction during low temperature oxidation of blended coals
Study on thermochemical kinetic characteristics and interaction during low temperature oxidation of blended coals
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DOI：
10.1016/j.joei.2014.09.007
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发表时间：
2015-08-01
影响因子：
5.7
通讯作者：
Yu, Zhaosheng
中科院分区：
文献类型：
--
作者：
Chen, Gang;Ma, Xiaoqian;Yu, Zhaosheng
采用热重分析法研究了单种煤和混煤的低温氧化特性。制备了掺量为50%的共混物，研究了它们的热化学行为和动力学。煤的低温氧化过程大致可分为两个间歇阶段，对应的温度范围分别为30-140 ℃和150-260 ℃。在45-180 ℃范围内，混煤在低温氧化过程中存在协同作用。在混煤中添加一定量的高挥发分烟煤有助于缓解煤的低温氧化，这可能是由于煤中水分含量较低以及某些潜在的矿物质增加了煤的化学惰性。第一阶段和第二阶段分别可用三级反应机理模型和三向输运扩散机理模型描述。阶段1的表观活化能小于阶段2。(C)2014年能源研究所。由爱思唯尔有限公司出版。保留所有权利。
The low temperature oxidation characteristics of individual coals and blended coals were studied via thermogravimetric analysis. Blends 50% on dosage ratio were prepared to investigate their thermochemical behavior and kinetic. The low temperature oxidation process of coal could be roughly divided into two interval stages, corresponding temperature ranges of which were 30-140 degrees C and 150-260 degrees C, respectively. A synergistic interaction between blending coals was observed within the temperature range of 45-180 degrees C during the low temperature oxidation process. A certain addition of high volatile bituminous coal to the blended coals would help to relieve low temperature oxidation of coal, which could be attributed to the low moisture and some potential minerals that could increase the chemical inertness. Third-order reaction mechanism model and three-way transport diffusion mechanism model could be used to depict stage 1 and stage 2, respectively. And the apparent activation energy of stage 1 was smaller than stage 2. (C) 2014 Energy Institute. Published by Elsevier Ltd. All rights reserved.