Study on the Combustion Process of Pulverized Coal and Carbonaceous Matter Dust in the Blast Furnace

摘要

As we know, there are a great amount of elemental carbon and elemental iron in the Blast Furnace Dust, which also contain a large quantity of harmful elements, such as K, Na, Pb and Zn. According to our analysis of the dust particles' size, the Gravity Dust are larger than the Cloth-bag Dust in size. The size of the Gravity Dust is between 46.08μm and 355.95μm, while almost 70% of the cloth-bag Dust are no bigger than 46.08μm, which is the smallest size of the Gravity Dust. In this study, we analyzed the shape and distribution of the carbonaceous matter in the Blast Furnace Dust by SEM and MM (Metallographic Microscope) and got the unburned pulverized coal and coke's proportions in the dust by quantitative analysis. Based on the coke ratio and the coal ratio, we calculated the unburned pulverized coal's and coke's availabilities in BF. What's more, we provided some effective methods for increasing the amount of the coal injection and decreasing BF's coke ratio.