Research and Industrial Application of the Evaluation Method of Pulverized Coal Injection for Blast Furnace

The evaluation method for pulverized coal injection in blast furnace including parameters of blast volume, pressure difference, gas dust production, quality, etc. was developed in this work. Indexes for smooth operation of blast furnace and utilization of PCI (pulverized coal injection) coal (named carbon content index) were also proposed. The evaluation method can reflect the effect of type of pulverized coal on the utilization ratio of pulverized coal and the blast furnace performances. The industrial trial showed that when 10% Coal B was used, smooth operation index reduced by more than 0.05 and carbon content index increased by over 1.0, which indicated that coal B could not be used too much in PCI. When coal A was used up to 35%, smooth operation index increased 0.08 and carbon content index reduced by over 0.22 with blast furnace output and coal ratio increasing, which meant that Coal A was suitable for PCI.