Numerical Simulation of Innovative Slag Splashing Process in a Converter Using a Nozzle-Twisted Oxygen Lance

IF 2.5 3区材料科学 Q3 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY

Journal of Sustainable Metallurgy Pub Date : 2024-05-08 DOI:10.1007/s40831-024-00836-z

Han Zhang, Ke Liu, Hongxin Zhao, Yue Tian, Jianye Liang, Zhangfu Yuan

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Abstract

The innovative slag splashing technology can significantly reduce CO₂ emissions in the steel industry. However, conventional oxygen lances are no longer sufficient due to the gas-slag reactions involved. Hence, the feasibility of applying nozzle-twisted oxygen lances to the innovative slag splashing process was investigated in this work. Numerical simulation was employed to compare the CO₂ jet, its impact characteristics on the slag, and the slag splashing performance of both the nozzle-twisted and conventional oxygen lances. It was found that the nozzle-twisted jet has higher radial and tangential velocities and a more significant impact region compared with the conventional jet. Furthermore, it exhibited superior stirring capability for the melt pool, enhancing the average velocity of the slag and reducing the size of dead zones. This facilitated the mixing of carbon powder and the interfacial reaction between CO₂ and the slag. However, the slag splashing performance deteriorated after the oxygen lance was replaced. Fortunately, the slag still reached the vicinity of the slag line. Furthermore, the addition of bottom blowing compensated for the disadvantages, elevating the slag mass flow rate and further enhancing the stirring of the slag. Therefore, utilizing nozzle-twisted oxygen lances is feasible in this scenario.

Graphical Abstract

Abstract Image

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使用喷嘴-缠绕氧枪对转炉中的创新溅渣过程进行数值模拟

创新的溅渣技术可以显著减少钢铁行业的二氧化碳排放量。然而，由于涉及气体-熔渣反应，传统的氧气喷枪已不再足够。因此，本研究调查了将喷嘴扭曲氧枪应用于创新溅渣工艺的可行性。通过数值模拟，比较了喷嘴扭转式氧枪和传统氧枪的二氧化碳射流、其对熔渣的影响特性以及熔渣喷溅性能。结果发现，与传统射流相比，喷嘴扭转射流的径向速度和切向速度更高，冲击区域更大。此外，它对熔池的搅拌能力更强，提高了熔渣的平均速度，减小了死区的大小。这有利于碳粉的混合以及二氧化碳与熔渣之间的界面反应。然而，更换氧气喷枪后，熔渣喷溅性能有所下降。幸运的是，熔渣仍能到达渣线附近。此外，增加底部吹气弥补了上述缺点，提高了熔渣质量流量，进一步加强了对熔渣的搅拌。因此，在这种情况下使用喷嘴扭转式氧气喷枪是可行的。

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来源期刊

Journal of Sustainable Metallurgy Materials Science-Metals and Alloys

CiteScore

4.00

自引率

12.50%

发文量

151

期刊介绍： Journal of Sustainable Metallurgy is dedicated to presenting metallurgical processes and related research aimed at improving the sustainability of metal-producing industries, with a particular emphasis on materials recovery, reuse, and recycling. Its editorial scope encompasses new techniques, as well as optimization of existing processes, including utilization, treatment, and management of metallurgically generated residues. Articles on non-technical barriers and drivers that can affect sustainability will also be considered.