Abstract：Benefit to abundant natural gas resources, many steel plants in Russia use natural gas for blast furnace injection. In order to realize the rational allocation of resources and maximize the benefits, increasing the amount of coal injection in the blast furnace and reducing the use of natural gas has become a new development direction for Novolipetsk Steel Company. Two kinds of high-volatile coals (No.1, No.2) and two kinds of low-volatile coals (No.3, No.4) provided by Russia as well as blended coals were conducted proximate analysis and research on injection characteristics such as ignition point, explosiveness, and ash melting point. The study found that No.1 and No.2 coals have stronger explosiveness and lower ignition points, while No.3 and No.4 coals have higher ignition points and lower combustion rates. The four types of coal powder are not suitable for blast furnace injection alone. The pulverized coal obtained by the mixed coal treatment is non-explosive, the burning rate is higher than that of lean coal, the ignition point is between the corresponding two kinds of single coal, and the ash mass fraction is lower than 8%, which is lower than the ash requirement of domestic blast furnace injection coal. However, the grindability of Russian coal is generally poor. In the set coal blending plan, the blended coal with No.2 bituminous coal and No.4 lean coal has a moderate ignition point, higher combustion rate and better grindability. This kind of blended coal is more suitable for blast furnace injection, of which No.2 bituminous coal accounts for 40% is the most suitable plan.
2021, Vol. 31 
