利用计算机控制扫描电镜技术(Computer Controlled Scanning Electron Microscopy,CCSEM)研究了煤中矿物特性及其在燃烧过程中的转化行为。结果表明原煤中矿物主要为粘土和黄铁矿,且主要以外在矿物的形式存在,粒径多在10μm以上,而内在...利用计算机控制扫描电镜技术(Computer Controlled Scanning Electron Microscopy,CCSEM)研究了煤中矿物特性及其在燃烧过程中的转化行为。结果表明原煤中矿物主要为粘土和黄铁矿,且主要以外在矿物的形式存在,粒径多在10μm以上,而内在矿物绝大部分小于10μm。不同矿物具有不同的粒径分布和内在/外在特性,显示煤中矿物分布的非均一性。煤灰主要由莫来石、铁、钙和钠的铝硅酸盐组成。通过K、Fe、Ca和Na在原煤及其产物所含矿物中的质量分布对比,揭示了它们在燃烧过程中的转化行为。煤灰粒径的变大是矿物颗粒熔融聚合的结果。展开更多
By using the advanced instrumentation of a Computer Controlled Scanning Electron Microscope (CCSEM), X-ray diffraction (XRD) and X-ray fluorescence (XRF), the ash composition and the mineral components of six typical ...By using the advanced instrumentation of a Computer Controlled Scanning Electron Microscope (CCSEM), X-ray diffraction (XRD) and X-ray fluorescence (XRF), the ash composition and the mineral components of six typical Huainan coals of different origins were studied. The transformation of mineral matter at high temperatures was tracked by XRD in reducing conditions. The quartz phase decreased sharply and the anorthite content tended to increase at first and then decreased with increasing temperatures. The formed mullite phase reached a maximum at 1250 ℃ but showed a tendency of slow decline when the temperature was over 1250 ℃ . The mullite formed in the heating process was the main reason of the high ash melting temperature of Huainan coals. Differences in peak intensity of mullite and anorthite reflected differences in phase concentration of the quenched slag fractions, which contributed to the differences in ash melting temperatures. The differences in the location of an amorphous hump maximum indicated differences of glass types which may affect ash melting temperatures. For Huainan coal samples with relatively high ash melting tempera- tures, the intensity of the diffraction lines for mullite under reducing condition is high while for the samples with rela- tively low ash melting temperature the intensity for anorthite is high.展开更多
文摘利用计算机控制扫描电镜技术(Computer Controlled Scanning Electron Microscopy,CCSEM)研究了煤中矿物特性及其在燃烧过程中的转化行为。结果表明原煤中矿物主要为粘土和黄铁矿,且主要以外在矿物的形式存在,粒径多在10μm以上,而内在矿物绝大部分小于10μm。不同矿物具有不同的粒径分布和内在/外在特性,显示煤中矿物分布的非均一性。煤灰主要由莫来石、铁、钙和钠的铝硅酸盐组成。通过K、Fe、Ca和Na在原煤及其产物所含矿物中的质量分布对比,揭示了它们在燃烧过程中的转化行为。煤灰粒径的变大是矿物颗粒熔融聚合的结果。
基金Projects 2003001 supported by the key project of Huainan city, & 2004kj125 by the Science Funding of Department of Education of Anhui Province
文摘By using the advanced instrumentation of a Computer Controlled Scanning Electron Microscope (CCSEM), X-ray diffraction (XRD) and X-ray fluorescence (XRF), the ash composition and the mineral components of six typical Huainan coals of different origins were studied. The transformation of mineral matter at high temperatures was tracked by XRD in reducing conditions. The quartz phase decreased sharply and the anorthite content tended to increase at first and then decreased with increasing temperatures. The formed mullite phase reached a maximum at 1250 ℃ but showed a tendency of slow decline when the temperature was over 1250 ℃ . The mullite formed in the heating process was the main reason of the high ash melting temperature of Huainan coals. Differences in peak intensity of mullite and anorthite reflected differences in phase concentration of the quenched slag fractions, which contributed to the differences in ash melting temperatures. The differences in the location of an amorphous hump maximum indicated differences of glass types which may affect ash melting temperatures. For Huainan coal samples with relatively high ash melting tempera- tures, the intensity of the diffraction lines for mullite under reducing condition is high while for the samples with rela- tively low ash melting temperature the intensity for anorthite is high.
