摘要
对高岭石和铵伊利石含量不同的三种动力煤,使用马弗炉(MF)制取两个稳态加热工况的灰样品,并对其中含有黄铁矿的煤样,使用沉降炉(DTF)制取三个温度工况的飞灰样品,通过X射线衍射(XRD)分析各煤灰样品中的物相组成.结果表明:马弗炉815℃稳态加热高岭石和铵伊利石均只是完成脱羟基分解.1 050℃稳态加热高岭石和铵伊利石,除自身反应生成莫来石外,也可与煤灰中活性金属氧化物化合;与高岭石相比,铵伊利石自身转化生成方石英的过程较慢,但与其他物质反应时更容易生成方石英;沉降炉温度为1 050℃~1 250℃时,煤灰样品中高岭石和铵伊利石均未与煤中其他物质明显反应,但与高岭石相比,铵伊利石脱羟基转化为莫来石的过程较慢;由于铵伊利石悬浮加热反应产物中存在更多的脱羟基产物,它更可能会促进结渣的发生.
Three coals which have different contents of kaolinite,tobelite and other minerals were burned in a muffle furnace（MF）and a drop tube furnace（DTF）.Two kinds of muffle furnace ashes and three kinds of DTF ashes were prepared.The ash samples were analyzed using X-ray diffraction（XRD）.The results show that both kaolinite and tobelite are only completed dehydroxylation decomposition with the steady state heating at 815 ℃in the MF.With the steady state heating of 1 050 ℃,the dehydroxylation products of these two clay minerals not only produce mullite,but also can react with active metal oxides in the coal ash.Compared with kaolinite,the tobelite self-transformate more slowly to cristobalite,but which is more likely to react with other matter in coal ash to generate cristobalite.The two clay minerals do not react with other mineral matter between 1 050℃and 1 250℃ in the DTF,and the self-transformation of tobelite produc mullite more slowly than that of kaolinite with the increasing DTF temperature.More dehydroxylated tobelite generated in the DTF ash samples during the heating process,which have a high reactivity and promoted the occurrence of slagging.
作者
田思达
康志忠
禚玉群
方永旭
TIAN Sida KANG Zhizhong ZHUO Yuqun FANG Yongxu(Key Laboratory Of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric Power University, 102206 Beijing School of Energy, Power and Mechanical Engineering, North China Electric Power University, 102206 Beijing Thermal Engineering Department, Tsinghua University, 100084 Beijing)
出处
《煤炭转化》
CAS
CSCD
北大核心
2017年第4期13-17,共5页
Coal Conversion
基金
国家自然科学基金资助项目(51376061)
关键词
铵伊利石
高岭石
煤灰
沉降炉
物相分析
结渣特性
tobelite
kaolinite
coal ash
drop tube furnace
phase analysis
slagging characteristics
