升温速率对神木煤热解半焦结构性能的影响

解强; 梁鼎成; 田萌; 党钾涛; 刘金昌; 杨明顺

升温速率对神木煤热解半焦结构性能的影响

1.
中国矿业大学(北京) 化学与环境工程学院, 北京 100083;
2.
大唐国际化工技术研究院有限公司, 北京 100070

基金项目: 教育部中央高校基本科研业务费资助(2009KH10)。

详细信息

通讯作者:
解强

中图分类号: TQ530.2
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出版历程
- 收稿日期: 2015-03-05
- 修回日期: 2015-05-06
- 刊出日期: 2015-07-30

Influence of heating rate on structure of chars derived from pyrolysis of Shenmu coal

1.
School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, China;
2.
Datang International Chemical Technology Research Institute Co., Ltd., Beijing 100070, China

摘要

摘要: 利用管式炉和微波材料工作站分别对神木煤煤样进行终温为750 ℃的慢速(3和5 ℃/min)、中速(10和15 ℃/min)及快速(50、100、225、350和750 ℃/min)热解,基于热解半焦X射线衍射谱图解析热解半焦的微晶结构参数,采用傅里叶变换红外光谱表征热解半焦的表面化学,并借助热重分析仪、选用气化活性参数R_T评价热解半焦的气化反应活性。结果表明,随着升温速率的增大,神木煤热解半焦总体上呈现的趋势是:表面含氧官能团含量降低,半焦的微晶层片尺寸L_a和石墨化度明显提高,层间距d₀₀₂和堆积高度L_c略微减小,说明神木煤半焦结构随升温速率的提高变得规整;随着升温速率的增大,半焦的气化活性R_T从0.178 2降低至0.103 6。热解终温为750 ℃的神木煤热解过程中,快速热解有利于获得易石墨化、表面非极性化、气化反应性低的产物。
- 热解 /
- 升温速率 /
- 微晶结构 /
- 表面化学 /
- 煤焦气化活性 /
- 神木煤
Abstract: A series of char samples were derived from pyrolysis of Shenmu coal at low (3 and 5 ℃/min), medium (10 and 15 ℃/min) and fast (50, 100, 225, 350 and 750 ℃/min) heating rates, respectively, and at the same pyrolysis temperature of 750 ℃. Then these chars were characterized by means of X-ray diffractometer (XRD), Fourier transform infrared spectrometer (FT-IR) and thermogravimetric analysis (TGA) with the aim to investigate the influence of heating rate in pyrolysis process on the microcrystallite structure, surface chemistry and gasification reactivity of the derived chars. The results show that with the increase of pyrolysis heating rate, the amount of oxygen-containing functional groups on the surface of the chars decreases, the dimension of microcrystallite lamella L_a and the graphitizing degree of the char increase obviously, the distance between lamella d₀₀₂ and mean height of lamella L_c decrease slightly, and the gasification reactivity R_T of chars reduces from 0.178 2 to 0.103 6. It can be concluded that the higher heating rate in the process of pyrolysis at 750 ℃ will result in higher graphitization of char with nonpolar surface and low gasification reactivity for Shenmu coal.
- pyrolysis /
- heating rate /
- crystallite structure /
- surface chemistry /
- gasification reactivity of char /
- Shenmu coal

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