Analysis of key issues on longevity of blast furnace hearth
JIAO Ke-xin1,2, ZHANG Jian-liang1,2, LIU Zheng-jian1,2, YANG Tian-jun1,2
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
Abstract：Longevity of blast fornace is an inevitable trend of developing of large blast furnace. The key lies in the long life of a blast furnace is to find out the basic reason for blast furnace corrosion. Aiming at the issue, the common problems of blast furnace longevity from five aspects were discussed: The essence of blast furnace hearth erosion, the mechanism of "elephant-like erosion" in blast furnace hearth, the inhomogeneity of erosion in the circumferential direction of blast furnace hearth, the analysis of blast furnace cooling intensity and efficiency, and the maintenance technology of blast furnace. As a result, it was pointed out that the nature of carbon brick damage in the blast furnace hearth is the corrosion of carbon brick by carbon-unsaturated hot metal. The details are as follows: Firstly, the most serious part of "elephant-like erosion" was located at the root of dead stock columns. Secondly, it clarified that the main reason for the inhomogeneity of erosion was the uneven distribution of cooling water and air volume of blast system in the circumferential direction of blast furnace. Thirdly, the actual function of the cooling system was illustrated, which was to lower the hot surface temperature of refractory. Additionally, the cooling strength index and cooling efficiency index of blast furnace were proposed. At last, the maintenance technology of blast furnace hearth was explored by using two modes: titanite-free furnace protection and titanite furnace protection.
焦克新, 张建良, 刘征建, 杨天钧. 关于高炉炉缸长寿的关键问题解析[J]. 钢铁, 2020, 55(8): 193-198.
JIAO Ke-xin, ZHANG Jian-liang, LIU Zheng-jian, YANG Tian-jun. Analysis of key issues on longevity of blast furnace hearth[J]. Iron and Steel, 2020, 55(8): 193-198.
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2020, Vol. 55 
