In the half century that blast furnace coal injection products have been industrialized and widely used, with the increasing domestic steel production capacity and the continuous improvement and improvement of the key technology of blast furnace coal injection, the market demand has gradually expanded, especially In recent years, with the increasing shortage of high-quality coking coal resources in China, the status of blast furnace injection coal in the steel smelting process has been increasing, and it is playing an increasingly important role in saving smelting costs in the steel industry. In fact, the original intention of blast furnace coal injection as a metallurgical application determines the trend: (1) Partial replacement of metallurgical coke with pulverized coal reduces the blast furnace iron-to-coke ratio and pig iron cost; (2) Adjusts the furnace condition heat system (3) The injected pulverized coal is gasified and burned in front of the blast furnace tuyere to reduce the theoretical combustion degree. In order to maintain T management, compensation is required, which creates conditions for the blast furnace to use high air and oxygen-enriched blast; (4) ) Injecting pulverized coal to replace part of the coke, on the one hand, it can save coking investment, build less coke ovens, and reduce air pollution caused by coking; on the other hand, it can greatly alleviate the tight supply and demand of coking coal.