Abstract: With the increasing supply of scrap and severe requirements for energy conservation and environmental protection, high efficiency low consumption high scrap ratio converter technology is demanded increasingly urgent in steel industry. At present, the technical scheme of high scrap ratio converter lacks systematization in our country, and the scrap ratio of converter is generally not exceed 35 %. Systematic high scrap ratio converter technology should be researched around how scrap is added and how heat gap in converter is compensated. Preheating scrap and good combustion in the converter are the key technologies to improve converter energy utilization efficiency and further increase the scrap ratio. Combining C-O reaction theory and existing trials, the result shows that post combustion ratio (PCR) and heat transfer efficiency (HTE) of C-O reaction to the molten steel can be significant improved. Compared to the common top-blowing, the current C-O reaction heat transferred to the molten steel can be raised by more than 88.3 %.

Key words: scrap ratio, C-O reaction, post combustion, heat transfer efficiency