Abstract：To reduce blast furnace ironmaking solid carbon consumption, and efficiently utilize high-temperature metallurgical by-product gas, the oxygen-enriched blast furnace blowing a reducing gas process was proposed, established the mathematical model based on material balance and heat balance of the blast furnace was established, and the theoretical combustion temperature calculation was revised. Using this model, the technical parameters of the ironmaking process of the traditional oxygen-enriched blast furnace, the hearth injection of oxygen-enriched reduction gas and furnace body injection of circulating gas were analyzed. The results showed that when the oxygen concentration reached 50% and the volume of reducing gas was 267 m3/t, the coke ratio was 291 kg/t, the coal ratio was 150 kg/t, and the direct reduction degree was 0.195. Compared with the traditional blast furnace, the fuel ratio was reduced by 109 kg/t, and the overall energy consumption was reduced by 4.8%. For every 100 ℃ increase in reducing the gas temperature, more reducing gas about 5.8 m3 can be sprayed, and the coke ratio can be reduced by about 5.5 kg/t. The amount of reducing gas injection had a great influence on the theoretical combustion temperature. The theoretical combustion temperature can be reduced by about 1.9 ℃ for each 1 m3/t reducing gas injected into the furnace hearth at 1 000 ℃.
王瀚, 王静松, 彭星. 高炉富氧喷吹还原性气体工艺分析[J]. 中国冶金, 2021, 31(5): 19-25.
WANG Han, WANG Jing-song, PENG Xing. Technology analysis on reducibility gas injection into oxygen-enriched blast furnace[J]. China Metallurgy, 2021, 31(5): 19-25.
2021, Vol. 31 
