氧对宜宾煤中燃料氮迁移特性的影响  

Investigation on Effects of Oxygen on the Transformation of Yibin Coal Nitrogen Functionality

作　　者：姚明宇[1] 刘艳华[1] 车得福[1] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《燃烧科学与技术》2004年第4期336-340,共5页Journal of Combustion Science and Technology

基　　金：国家重点基础研究发展规划资助项目 (G1 9990 2 2 2 1 0 ) ;高等学校博士学科点专项科研基金资助项目 (2 0 0 2 0 6980 4 8)

摘　　要：利用X射线光电子能谱 ,研究了宜宾煤与煤焦中氮的形态 ,探讨了氧对煤中燃料氮迁移规律的影响 .制焦气氛为高纯氩气中的惰性热解和氧 /氩混合气氛 .制焦温度为 70 0℃和 90 0℃ .结果表明 ,煤焦中氮官能团的存在形式受温度控制 ,与气氛无关 ,但是温度和氧量对各官能团量的变化都有影响 .氧的参与造成热解时燃料氮迁移规律的改变 ,这种改变随温度的升高愈加明显 .有氧存在时 ,焦中氮的总含量随温度的升高迅速减少 .实验结果分析说明 ,煤焦N X中氧的来源是煤本身结合的燃料氧 ,而热解气氛中氧的参与不会造成N 6和N Q转变为吡啶酮和N X .各种氮官能团形式随温度的升高都有不同程度的减少 。The effects of oxygen on the transformation of coal nitrogen were investigated base on the determination of nitrogen functionalities in the chars of Yibin coal by the use of X-ray photoelectron spectroscopy (XPS). The chars have been prepared at 700°C, 900°C in two different atmospheres. The functionality form existing in chars are independent of oxygen, while the distributing of the functionalities is affected by oxygen greatly. The presence of oxygen changes the mechanisms of the transformation of nitrogen functionalities. Oxygen accelerates the release of nitrogen from the molecular structure of coal, resulting in the rapidly decrease of N-Q. Oxygen of N-X in chars comes from parent coal other than the atmosphere. O2 in the atmosphere does not bring about the transformation from N-6 and N-Q to pyridone and N-X as reported in some former literatures. Conversions between the nitrogen functionality groups do not happen because all of them decrease rapidly when the temperature is high enough with the presence of O2.

关 键 词：氮氧化物 X射线光电子能谱 氮官能团 热解 

分 类 号：TK16[动力工程及工程热物理—热能工程]