1.State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of Advanced Ferrometallurgy, Shanghai University, Shanghai 200444, China; 2.CISDI Engineering Co., Ltd., Chongqing 400013, China; 3.Baoshan Iron and Steel Co., Ltd., Shanghai 200941, China; 4.Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China
Abstract：Abstract：The formation of stable iron skull on the inner surface of blast furnace hearth can protect the blast furnace carbon bricks and prolong the service life of the blast furnace. Optical digital microscope was used to observe and analyze the production samples of blast furnace iron skull to explore the effect of different coke volume ratio on the thermal conductivity of the iron skull. The thermal conductivity of the iron skull was measured by transient planar heat source method (TPS), and the relationship between its composition and thermal conductivity was further analyzed. The results show that the solidified iron skull is consist of iron, coke filled with hot metal, graphite carbon and a small amount of slag phase. There is no air gap in the solidified iron skull. The thermal conductivity of the samples produced in solidified iron skull is 27.21-97.38W/(m·K), and the linear relationship between thermal conductivity (λ) and coke area ratio (Sc=22%-48%) is as follows:λ=-257.47Sc+157.65. The thermal conductivity of the solidified iron skull ranges from 30.54 to 53.95W/(m·K). The linear relationship between the thermal conductivity (λ) and the volume ratio of coke in the solidified iron skull is as follows:λ=-80.50Vc +78.56. The thermal conductivity by the volume ratio of coke (Vc=39%-50%) is much larger than of the solidified iron skull (2-4W/(m·K)) used in the current mathematical model. With the increase of coke particle size, the thermal conductivity of solidified iron skull increases first and then decreases. This study clarifies the phase composition and thermal conductivity of the solidified iron skull, and points out the direction for the study of blast furnace longevity.
温旭1，邹忠平2，姜华3，王炜4，郑少波1，余仲达1. 高炉炉缸凝铁层的组成分析与导热系数测定[J]. 钢铁研究学报, 2019, 31(9): 779-786.
WEN Xu1,ZOU Zhong-ping2,JIANG Hua3,WANG Wei4,ZHENG Shao-bo1,YU Zhong-da1. Composition analysis and thermal conductivity measurement of iron skull in blast furnace hearth. JOURNAL OF IRON AND STEEL RESEARCH , 2019, 31(9): 779-786.
2019, Vol. 31 
