A New Method of Removing Inclusions in Molten Steel by Injecting Gas from the Shroud
A New Method of Removing Inclusions in Molten Steel by Injecting Gas from the Shroud
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DOI：
10.2355/isijinternational.46.1177
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发表时间：
2006-08
影响因子：
1.8
通讯作者：
Q. Zhang;L. Wang;Zhi Xu
中科院分区：
文献类型：
--
作者：
Q. Zhang;L. Wang;Zhi Xu
采用数学模型和水模型相结合的方法，对钢水中夹杂物的脱除技术进行了分析和研究。研究了喷气位置、喷气流量和喷嘴尺寸对包覆区气泡大小和分布的影响，分析了吹炼参数与夹杂物去除效率的关系，优化了吹炼参数。结果表明，围护结构扩大部湍涡较强，有利于细小气泡的产生和均匀分布，通过控制气体流量，可以在围护结构和中间包内形成直径0.3~0.5 mm的细小气泡。多余的气体使气泡尺寸急剧增大。喷嘴尺寸对气泡的大小和分布有一定的影响，较大的喷嘴尺寸不利于细小气泡的产生。因此，最佳的注气位置是在围护结构的扩张部。合理的气体流量和喷嘴尺寸将大大提高夹杂物的去除效率。
A technology of removing inclusions in molten steel by injecting gas from the shroud has been analyzed and studied by method of mathematical model and water model. Study of position of injecting gas, flow rate of gas and gas nozzle size on the generated bubble size and distribution at the shroud has been investigated; the relationship between blowing parameters and inclusion removal efficiency has been analyzed in order to optimize the blowing parameters. The results show that the stronger turbulent vortex at the enlarged part in the shroud favors fine bubbles generation and uniform distribution; fine bubbles in diameter of 0.3 to 0.5 mm can be generated in the shroud and tundish by controlling flow rate of gas. The superfluous gas makes bubble size largen sharply. The nozzle size has some effect on bubbles size and distribution; the larger nozzle size goes against fine bubbles generation. So the optimum gas injected position is located at the enlarged part in the shroud. The resonable flow rate of gas and nozzle size would greatly improve inclusion removal efficiency.