煤粉燃烬性能与颗粒结构分维的关系

Relationship Between Structure Fractal and Burnout Performance of Pulverized Coal

为研究煤颗粒结构与燃烬性能的关系 ,进行了煤粉动态燃烧试验·采用分形几何理论定义了颗粒结构分维Ds,以描述煤粉颗粒结构特征·几种煤的结构分形维数计算表明 :煤粉的颗粒分维数与煤种有关·总体上 ,烟煤的分维数大于无烟煤·煤燃烬性能主要与煤挥发分产率有关 ,Ds 的数值体现了颗粒结构对煤粉燃烧性能的影响 ,即煤的化学成分接近时 ,颗粒结构分维数大的煤粉其燃烧率高·煤岩组成类型、含量是影响煤粉结构分维的主要因素·

The dynamic combustion experiment was carried out to research the relationship between the structure of pulverized coal and its burnout performance in blast furnace. To describe structure characteristic of coal particle, D s (structure fractal dimension) was defined based on fractal theory. The D s varies with the different coal. The D s of bituminite is more than that of the anthracite on the whole. The burnout performance of coal is mainly affected by its volatile matter yield. The D s is related to combustion ratio of the pulverized coal. For these coal with approximative chemical content, the kind that has biggish D s gets higher combustion ratio. The maceral form and content have great impact on the structure fractal dimension.