Fe_2O_3催化无烟煤燃烧燃点降低机理的实验研究
Experimental study on mechanism of lowering ignition temperature of anthracite combustion catalyzed by Fe_2O_3
查看参考文献26篇
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文摘
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@@ 煤中添加催化剂可以降低其燃点,提高其燃速,研究发现碱金属、碱土金属、过渡金属等化合物可使煤的燃点降低,燃速提高~([1-4]).由于煤结构的复杂性以及不均匀性,许多研究从影响煤燃烧特性入手~([5-12]),通过催化燃烧特性的研究解释催化燃烧机理, 获得了一些很有价值的实验结果,诸如催化燃烧动力学~([6,9-10])、一体化催化机理等~([5-6,11-12]).然而煤催化燃烧更直接的效果是降低煤粉燃点,导致催化剂降低煤粉燃点的原因一直是困扰催化燃烧研究领域的一个难题. |
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其他语种文摘
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TG-DTG and DTA determination indicated that ignition temperature of anthracite was lowered from 458℃ to 405℃ by addition of 10% catalyst Fe_2O_3. Based on the nature of anthracite ignition temperature, pyrolysis conversion and pyrolysis gas composition during the catalytic combustion were examined. The results showed that with Fe_2O_3 addition anthracite pyrolysis conversion was 3. 0% at 405℃ and components with higher heating value increased in the pyrolysis gas. However, without Fe_2O_3 addition pyrolysis conversion was 1. 8% at ignition temperature. It could be concluded that the heat from the homogeneous combustion of catalytic combustion was higher than that of non-catalytic combustion. TG-DTG indicated combustion conversion of 10 % at ignition. SEM images of chars indicated rough surface of char with plenty of small pores. BET of char from catalytic combustion was 170 m~2·g~(-1) while BET of char from non-catalytic combustion was only 128 m~2·g~(-1), which could be the main reason for lowering ignition temperature. The results from oxygen adsorption experiment showed increased oxygen content of coal with catalyst addition, which caused faster oxygen adsorption at a lower temperature and shortened the time to get required oxygen concentration and heat accumulation for ignition, thus the ignition temperature was lowered. |
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来源
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化工学报
,2009,60(7):1707-1713 【核心库】
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关键词
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催化燃烧
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燃点
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机理
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热解
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地址
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中国科学院过程工程研究所, 多相复杂系统国家重点实验室, 北京, 100190
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0438-1157 |
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学科
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化学工业 |
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基金
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国家863计划
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文献收藏号
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CSCD:3506234
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