1. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, Hebei, China; 2. State Key Laboratory for Advanced Iron and Steel Processes and Products, Central Iron and Steel Research Institute, Beijing 100081, China; 3. College of Metallurgy and Resources, Anhui University of Technology, Ma′anshan 243011, Anhui, China
Abstract:To solve the problem of the long smelting process and large pollutant discharge in the traditional blast furnace ironmaking process, non-blast furnace ironmaking technology has attracted extensive attention from scholars at home and abroad. By establishing a mathematical model coupling the heat and material balance, the material balance and heat balance of the rotary kiln pre-reduction-oxygen combustion furnace were calculated, revealing the process parameters under different metallization rates, gas oxidation degrees and blast oxygen contents. The variation law was finally carried out. The thermal analysis of the process was carried out using Lingo software, and the relationship between the pre-reduction metallization rate in the rotary kiln and the suitable coal consumption of the melting furnace was determined. The results show that increasing the metallization rate, gas oxidation degree and blasting oxygen content can reduce the coal consumption and oxygen consumption of the process, but the gas volume and gas calorific value will not be optimal with the increase of operating parameters. After the optimal solution of the working condition parameters, it was known that the rotary kiln-oxygen combustion melting furnace condition was used when the charge metallization rate is 70%, the melting furnace gas oxidation degree is 16%, and the blast oxygen content is 100%, which is the best condition.
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