Softening and Melting Behavior of Ferrous Burden in Hydrogen-rich Blast Furnace Blowing Break and Re-blowing

被引：0
作者：
Li, Qiang [1 ]
Wang, Jing Song [1 ]
Wang, Guang [1 ]
She, Xue Feng [1 ]
Xue, Qing Guo [1 ]
Zuo, Hai Bin [1 ]
机构：
[1] State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing
来源：
ISIJ International | 2025年 / 65卷 / 06期
基金：
中国国家自然科学基金;
关键词：
blowing break and re-blowing softening zone; ferrous burden; hydrogen-rich blast furnace; melting zone;
D O I：
10.2355/isijinternational.ISIJINT-2024-247
中图分类号：
学科分类号：
摘要：
Blast furnace blowing break and re-blowing is a regular operation in the smelting process, However, some blast furnace conditions fluctuate for a long time due to improper operation of blast furnace blowing break and re-blowing, and preventing rapid attainment of production capacity. This paper first analyzes the influence of hydrogen-rich on the cohesive zone. Subsequently, it simulates the conditions of ferrous burden during partial and complete tuyere blowing break under hydrogen-rich conditions, followed by re-blowing. The study explores the influence of these operational changes on the softening and melting behaviors of the ferrous burden. The results indicate that with a 10% hydrogen enrichment, the melting range of ferrous burden narrows and shifts to higher temperatures, improving the permeability of the burden. During partial tuyere blowing break, this promotes the reduction of the ferrous burden and the carburization of metallic iron, increasing the melting start temperature and decreasing the dropping temperature by 29°C, thereby narrowing the cohesive zone. Both maximum pressure difference (ΔPmax) and permeability index (S) values decrease. In contrast, with a complete tuyere blowing break, the dropping temperature of the ferrous burden gradually increases from 1 459°C to 1 478°C as the isothermal duration extends, widening the melting interval and leading to an increase in both ΔPmax and S values. © 2025 The Iron and Steel Institute of Japan.
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页码：825 / 832
页数：7
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