化工学报 ›› 2009, Vol. 60 ›› Issue (9): 2321-2326.

• 能源和环境工程 • 上一篇    下一篇

Fe2O3对高变质程度脱灰煤热解反应性与半焦结构的影响

公旭中,郭占成,王志   

  1. 中国科学院过程工程研究所多相复杂系统国家重点实验室; 中国科学院研究生院;北京科技大学循环与生态冶金教育部重点实验室
  • 出版日期:2009-09-05 发布日期:2009-09-05

Effects of Fe2O3 on pyrolysis reactivity of demineralized higher rank coal and its char structure

GONG Xuzhong, GUO Zhancheng, WANG Zhi   

  • Online:2009-09-05 Published:2009-09-05

摘要:

利用热天平研究了共混合法负载Fe2O3高变质程度脱灰煤的热解反应性,结果表明煤粉负载Fe2O3后热解反应性高于无负载的热解反应性。负载Fe2O3煤样在程序升温加热的马弗炉中制备出半焦,利用FTIR、XRD和RAMAN 等分析了半焦结构。由TG和FTIR可知,负载Fe2O3煤样热解时,热解转化率增加,热解后自由基增加。由XRD可知,Fe2O3没有使得煤样半焦的002峰衍射角发生明显变化,但使LaLc参数明显降低,说明半焦的微晶结构石墨化程度降低。另外,在XRD分析谱图中发现部分Fe2O3被还原成FeO。由RAMAN可知,Fe2O3使半焦的G峰峰面积降低,D峰峰面积增加,说明半焦的有机结构有序化程度降低。

关键词:

高变质程度, 催化热解, 半焦, 结构

Abstract:

The pyrolysis reactivity of demineralized higher rank coal loaded with Fe2O3 by using co-mixing was investigated with thermo-gravimetric analyzer, and it was indicated that pyrolysis reactivity of the sample loaded with Fe2O3 was higher than that of the sample without Fe2O3.Chars were prepared from the two coal samples in a temperature programmed muffle furnace, and their structures were analyzed by using FTIR, XRD and RAMAN.TG and FTIR results showed an increase of pyrolysis conversion and free radicals during pyrolysis of demineralized coal with Fe2O3.XRD revealed that diffraction angle of 002 peak did not change obviously, while by contrast, La and Lc decreased by loading with Fe2O3, indicating decreasing degree of graphitization for microcrystalline structure of char.In addition, parts of Fe2O3 were reduced to FeO as shown in XRD.RAMAN spectroscopy showed decreasing area of G band and increasing area of D band for char from demineralized anthracite loaded with Fe2O3, indicating that ordering of char was decreased by Fe2O3.

Key words:

高变质程度, 催化热解, 半焦, 结构