热解温度对无烟煤焦微观结构和脱硝特性的影响

doi:10.16085/j.issn.1000-6613.2015.06.022

化工进展 ›› 2015, Vol. 34 ›› Issue (06): 1636-1640.DOI: 10.16085/j.issn.1000-6613.2015.06.022

热解温度对无烟煤焦微观结构和脱硝特性的影响

尹艳山, 王泽忠, 田红, 张巍, 鄢晓忠, 陈冬林

长沙理工大学能源与动力工程学院, 湖南长沙 410114

收稿日期:2014-10-08 修回日期:2014-11-05 出版日期:2015-06-05 发布日期:2015-06-05
通讯作者: 尹艳山(1980—),男,博士,讲师,研究方向为燃煤污染物NO_x的排放控制。E-mail:yinyanshan5431@163.com。
作者简介:尹艳山(1980—),男,博士,讲师,研究方向为燃煤污染物NO_x的排放控制。E-mail:yinyanshan5431@163.com。
基金资助:
国家自然科学基金(51206012)、湖南省高等学校科学研究项目(12C0005)及可再生能源电力技术湖南省重点实验室开放基金项目(2012ZNDL005)。

Effect of pyrolysis temperature on microstructure and de-NO_x reactivity of anthracite char

YIN Yanshan, WANG Zezhong, TIAN Hong, ZHANG Wei, YAN Xiaozhong, CHEN Donglin

School of Energy & Power Engineering, Changsha University of Science & Technology, Changsha 410114, Hunan, China

Received:2014-10-08 Revised:2014-11-05 Online:2015-06-05 Published:2015-06-05

摘要/Abstract

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I_D1/I_G和I_D3/I_G先增大后减小, I_G/I_All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。

关键词: 煤燃烧, 热解, 拉曼光谱, 脱硝, 反应动力学

Abstract: 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-NO_x 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-NO_x 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, I_D1/I_G and I_D3/I_G, were shown to initially increase and then decrease with the increase of pyrolysis temperature, while with which I_G/I_All varied oppositely. As a result, the Longping anthracite was subjected to carbonization and subsequent preliminary graphitization during pyrolysis. It was found that the de-NO_x 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.

Key words: coal combustion, pyrolysis, Raman spectroscopy, de-NO_x, reaction kinetics

中图分类号:

TQ53

尹艳山, 王泽忠, 田红, 张巍, 鄢晓忠, 陈冬林. 热解温度对无烟煤焦微观结构和脱硝特性的影响[J]. 化工进展, 2015, 34(06): 1636-1640.

YIN Yanshan, WANG Zezhong, TIAN Hong, ZHANG Wei, YAN Xiaozhong, CHEN Donglin. Effect of pyrolysis temperature on microstructure and de-NO_x reactivity of anthracite char[J]. Chemical Industry and Engineering Progree, 2015, 34(06): 1636-1640.

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热解温度对无烟煤焦微观结构和脱硝特性的影响

Effect of pyrolysis temperature on microstructure and de-NO_x reactivity of anthracite char

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热解温度对无烟煤焦微观结构和脱硝特性的影响

Effect of pyrolysis temperature on microstructure and de-NOx reactivity of anthracite char

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Effect of pyrolysis temperature on microstructure and de-NO_x reactivity of anthracite char