高硅煤燃烧过程中矿物转化及重金属分布规律研究

Study on the mineral transformation and heavy metal distribution during high-silicon coal combustion

  • 摘要: 选取云南宣威地区高硅煤,对其在燃烧过程中矿物转化特征及重金属分布富集规律进行了研究。高硅煤中的矿物主要由石英、高岭石、黄铁矿和锐钛矿组成。飞灰中莫来石可能来自煤中石英、高岭石的转变,而石英主要来自煤中原始石英组分或由SiO2-Al2O3系统转化形成。分析高硅煤和高硅飞灰中部分重金属的富集特性,发现高硅煤中富集的元素有Cr、Cu和As,电厂ESP各级电场中富集的重金属有Mo元素,而Se元素在高硅煤和飞灰中分别都低于世界煤和飞灰的平均值。放射性元素Th和U含量在细粒径的高硅飞灰中都高于世界煤灰平均值,在ESP的4电场飞灰中富集系数分别为1.51和1.59。

     

    Abstract: The high-silicon coal in Xuanwei area of Yunnan is selected to study the transformation behavior of minerals and the distribution and enrichment of heavy metals during the combustion process. The minerals in high-silicon coal are mainly composed of quartz, kaolinite, pyrite and anatase. The mullite in fly ash may come from the transformation of quartz and kaolinite in coal; the quartz in fly ash mainly comes from the original quartz component in coal or is formed by the conversion of SiO2-Al2O3 system. Analyzing the enrichment characteristics of several heavy metals in high-silicon coal and its fly ash, it can be found that Cr, Cu, and As are enriched in the high-silicon coal, and Mo is the heavy metal enriched in the electric fields of the ESP, while Se contents in high-silicon coal and fly ash in China are both lower than the world average level. The contents of radioactive elements of Th and U in the fine-particle high-silicon fly ash are higher than the average of world coal ash, and the enrichment factors in the fly ash in the four electric fields of the ESP are 1.51 and 1.59, respectively.

     

/

返回文章
返回