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选取了2种低阶煤在不同气氛下沉降炉中进行燃烧实验,产生的灰颗收集到粒旋风分离器和低压冲击器中,利用透射电子显微镜和扫描电镜分析亚微米颗粒和超微米颗粒的形态,利用扫描电镜能量色散谱仪联用,透射电子显微镜能量色散谱仪联用和计算机控制的扫描电镜分析灰颗粒的化学元素组成。研究结果表明:O2/CO2燃烧改变超细颗粒物的大小分布和灰中元素的浓度分布,但没有改变细颗粒的生成机制。对于含有更多有机结构矿物质的褐煤,O2/CO2燃烧提高了Fe、Na/K、Al和Si的气化程度,也因此增加了亚微颗粒的浓度,而且褐煤中的Fe元素的气化较为特殊,O2/CO2燃烧氧气浓度的增加提高了Fe气化后在其他粒子上的附着。
Two kinds of low-rank coal were selected and burned in a settling furnace under different atmospheres. The resulting ash particles were collected in a cyclone separator and a low-pressure impactor. Transmission electron microscopy and scanning electron microscopy were used to analyze the effects of submicron particles and ultrafine particles Morphology, the use of scanning electron microscopy energy dispersive spectrometry, transmission electron microscopy energy dispersive spectrometry and computer-controlled scanning electron microscopy analysis of chemical composition of ash particles. The results show that the combustion of O2 / CO2 changes the size distribution of ultrafine particles and the concentration of elements in ash, but does not change the formation mechanism of fine particles. For lignite containing more organic structural minerals, O2 / CO2 combustion increases the degree of vaporization of Fe, Na / K, Al and Si and therefore increases the concentration of submicron particles, and the gasification of Fe in lignite More specific, the increase of O2 / CO2 combustion oxygen concentration increases the attachment of Fe to other particles after gasification.