Analysis of material flow and energy flow in synergistic treatment of solid waste in steel mills
MIAO Zhuang1, SHE Xuefeng1, SHI Jianhong2, WANG Ruyi3, WANG Jingsong1, XUE Qingguo1
1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China; 2. Guangdong Huaxin Environmental Protection Technology Co., Ltd., Shaoguan 512122, Guangdong, China; 3. Research Institute, Baoshan Iron and Steel Co., Ltd., Shanghai 201900, China
Abstract：In order to comprehensively recycle the solid waste produced by iron and steel enterprises, a process of multiple hearth furnace, rotary hearth furnace and molten electric furnace synergistic treatment of solid waste was proposed in this paper. Based on the law of conservation of mass and energy, the analytical model of material and energy flow was established. The potential energy saving effect of material and energy in the internal circulation of the process was calculated and analyzed. The influence of different metallized pellets with different metallization rates and different structure composition of charge on the energy efficiency of molten electric furnace system was investigated. And the change of the cooperation degree of different index parameters was analyzed. The results show that the pyrolysis gas and residue (high carbon) can be used as gas and reducing agent respectively, and the high calorific value gas and residue produced by pyrolysis tar residue are 534 kg/t and 466 kg/t, respectively. In addition, the analysis of the charge structure of the molten electric furnace system shows that with the increase of the metallization rate of the metallized pellets, the amount of slag and secondary zinc powder obtained during the molten reduction process do not change much, and the flue gas and power consumption per ton of iron show a linear downward trend. With the increase of the mass fraction of electric furnace dust pellet in the charging material, the power consumption of flue gas, slag, secondary zinc powder and ton iron respectively presents different linear increases. The raw material proportion of electric furnace dust pellet increases from 30% to 80%, and the power consumption difference between cold and hot charging decreases from 200 kW·h/t to 65 kW·h/t. Through the analysis of the synergy degree change of the collaborative process, it can be concluded that the synergy degree of the collaborative process system is the best, reaching 0.472, when the metallization rate of the metallized pellets produced in the rotary hearth furnace is 80% and the contribution rate of metallized pellets to hot metal is 40%. The construction of collaborative process can realize the stepwise utilization and efficient recovery of solid waste resources in steel mills and further create higher social value and economic benefits in the future.
苗壮, 佘雪峰, 石建红, 王如意, 王静松, 薛庆国. 协同处理钢厂固废工艺的物质流和能量流分析[J]. 钢铁, 2023, 58(11): 150-162.
MIAO Zhuang, SHE Xuefeng, SHI Jianhong, WANG Ruyi, WANG Jingsong, XUE Qingguo. Analysis of material flow and energy flow in synergistic treatment of solid waste in steel mills[J]. Iron and Steel, 2023, 58(11): 150-162.
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