| 等温热重分析法对煤焦反应动力学特性研究 |
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| 引用本文： | 孙锐,廖坚,李志刚,张旻晓.等温热重分析法对煤焦反应动力学特性研究[J].煤炭转化,2010,33(2). |
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| 作者姓名： | 孙锐 廖坚 李志刚 张旻晓 |
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| 作者单位： | 1. 哈尔滨工业大学燃烧工程研究所,150001,哈尔滨
2. 广西特种设备监督检验院,530022,南宁 |
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| 基金项目： | 国家高技术研究发展计划(863)项目(2007AA050302-04) |
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| 摘 要： | 针对工业气化炉二级旋风分离器的气化后半焦,同时选取京能烟煤在1173K,1273K和1373K三个温度下快速热解焦炭作为比较,在TGA/SDTA851e型热重分析仪上,对四种经历不同热过程的焦炭进行等温热重实验,实验温度范围为773K～1023K,研究煤焦燃烧反应动力学特性及其影响因素.煤焦制取方式和热解温度的不同决定了煤焦反应性的不同,在这四种煤焦中,气化半焦JC的反应性最小,而京能烟煤三种热解煤焦的反应性随着热解温度的升高而减小.随着燃烧温度和氧含量的升高,煤焦的反应速率在增大.同时,用半转化率法确定了煤焦燃烧的转捩温度和各个反应区域的活化能,在化学反应动力区,JC,JN-1,JN-2和JN-3活化能分别为115kJ/mol,57kJ/mol,70kJ/mol和97kJ/mol,与等转化率法所求得的平均活化能相近.随着煤焦转化率的增大,反应越来越困难,活化能也在增大,而且煤焦燃烧反应离开化学反应动力区的转捩温度也在升高.
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| 关 键 词： | 等温热重 煤焦燃烧反应性 半转化率法 等转化率法 化学反应动力学 |
STUDY ON CHAR OXIDATION REACTIVITY BY ISOTHERMAL THERMOGRAVIMETRIC METHOD |
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| Leungo Kelebopile.STUDY ON CHAR OXIDATION REACTIVITY BY ISOTHERMAL THERMOGRAVIMETRIC METHOD[J].Coal Conversion,2010,33(2). |
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| Authors: | Leungo Kelebopile |
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| Affiliation: | School of Energy and Engineering/a>;Harbin Institute of Technology/a>;150001 Harbin/a>;Guangxi Institute of Special Equipment Supervision and Inspection/a>;530022 Nanning |
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| Abstract: | The gasified semicoke obtained from the secondary cyclone of the Jincheng industrial gasifier was selected as one of the samples for the study,in addition,three chars were yielded by the investigation of the Jingneng bituminous coal in a drop tube deposition furnace at fast pyrolysis temperature of 1 173 K,1 273 K,1 373 K.Reactivity measurements of the four chars above mentioned were performed by TGA/SDA851e under the condition of constant temperature.The combustion behavior of the coal char and its effects... |
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| Keywords: | isothermal thermogravimetry coal char combustion reactivity half-life time method isoconversional method kinetics of reaction |
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