摘要
利用XRD对1100℃～1500℃高温下矿物质在弱还原气氛中的变化进行考察，并利用RIR对矿物质进行半定量分析，发现随着温度的升高莫来石含量增大，而SiO2含量下降，符合SiO2-Al2O3二元相图的变化。高温下部分无定形矿物质发生熔融，主要为硅铝酸盐。在煤焦二氧化碳气化过程中，熔融的硅铝酸盐与煤焦表面接触阻碍气化反应进行。利用FT-IR测定了硅铝酸盐结构的变化，说明高温下矿物质对气化反应的影响与硅铝酸盐的聚合程度存在一定的关系。
X-ray diffraction （XRD） was performed to analyze the mineral matter in coal ash from 1 100 ℃ to 1 500 ℃, with an interval of 50 ℃. Relative Intensity Ratio （RIR） method was used to caleulate the content of each crystalline in coal ash. The amount of mullite increases with elevated temperature but that of SiO2 decreases. The transformation of mullite and SiO2 accords well with.the binary phase diagram of SiO2-Al2O3. At high temperature, the amorphous mineral matters, mainly, aluminosilicates melt above ash softening temperature. During CO2 gasification at high temperature, the carbon conversion is hindered by the aluminosilicates melts, which cover the surface and block the pores of coal particles. Because of the short and ordered sequence of melts, FF-IR analysis was taken for the melts in coal ash after gasification. The structure alteration of aluminosilicates influences the surface tension of melts, which determines the interaction between coal particles and aluminosilicates.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2009年第2期134-138,共5页
Journal of Fuel Chemistry and Technology
基金
国家重点基础研究与发展规划(973计划,2004CB217704-03)
科技部国际合作重点项目(2005DFA60220)
关键词
硅铝酸盐
熔体
CO2高温气化
aluminosilicate
melts
high temperature gasification
