摘要
在氮气气氛和600～1000℃条件下，使用水平管式炉对龙坪无烟煤进行了热解制焦实验，利用拉曼光谱分析了热解煤焦的微观结构变化，使用热重分析仪（TGA）进行了无烟煤焦的程序升温脱硝实验，研究了热解温度对无烟煤焦微观结构和脱硝特性的影响。研究结果表明：热解温度对无烟煤焦的微观结构有显著的影响，随着热解温度升高，煤焦的拉曼光谱G峰与D1峰的位置差逐渐减小，谱峰积分面积逐渐缩小，积分面积比值ID1/IG和 ID3/IG先增大后减小，IG/IAl 先减小后增大。热解温度还对无烟煤焦的脱硝特性有明显的影响，无烟煤随着热解温度升高由炭化向初步石墨化转变，由于活性结构数量的减少和碳结构变得更加有序，无烟煤焦的脱硝反应性不断降低，脱硝反应活化能增大。
The Longping anthracite was pyrolyzed in the temperature range of 600—1000℃ under N2 atmosphere for the preparation of char. The evolution of microstructure of anthracite char was characterized by Raman spectroscopy. The de-NOx reactivity of anthracite char was investigated using a thermogravimetric analyzer （TGA） under programmed temperature conditions. The present work is focused on the impact of pyrolysis temperature on anthracite char microstructure and de-NOx reactivity. The char microstructure was affected significantly by heat treatment temperature. The difference between G and D1 band position and all Raman band areas were found to decrease with increasing pyrolysis temperature. In addition,band area ratio,ID1/IG and ID3/IG,were shown to initially increase and then decrease with the increase of pyrolysis temperature,while with which IG/IAl varied oppositely. As a result,the Longping anthracite was subjected to carbonization and subsequent preliminary graphitization during pyrolysis. It was found that the de-NOx reactivity of anthracite char decreased with increasing pyrolysis temperature,largely due to the reduction of active structure and the increase of structural order,also leading to the gradual increase of reaction activation energy.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2015年第6期1636-1640,共5页
Chemical Industry and Engineering Progress
基金
国家自然科学基金(51206012)
湖南省高等学校科学研究项目(12C0005)
可再生能源电力技术湖南省重点实验室开放基金项目(2012ZNDL005)
关键词
煤燃烧
热解
拉曼光谱
脱硝
反应动力学
coal combustion
pyrolysis
Raman spectroscopy
de-NOx
reaction kinetics
