ABSTRACT

Increasing the oxygen supply intensity of a converter is the main method of shortening the smelting time. However, the increase in oxygen supply intensity increases the splashing rate of the smelting process. Therefore, balancing these two phenomena is the content of many academic and metallurgical studies. However, the studies on the characteristics of O₂ + CO₂ mixed injection by a dual-parameter oxygen lance nozzle are rare. In this study, the effects of ambient temperature and gas flow rate on the characteristics of 92% O₂ + 8% CO₂ mixed jet were observed through simulations and analysed using Ansys Fluent commercial software. Results show that at 1773 K ambient temperature, the mixing degree of each jet of the new dual-parameter oxygen lance nozzle is lower than that of the conventional oxygen lance nozzle. In addition, the jet independence of the new nozzle is better than that of the conventional nozzle. Under the same distance, the impact area of the jet is large. By increasing the gas supply flow rate of the new dual-parameter oxygen lance nozzle by 5000 Nm³/h, the average velocity of the molten pool is increased by ∼9%. Combined with the advantages of CO₂ smelting, the new dual-parameter nozzle can increase the oxygen supply intensity and inhibit splashing.

摘要

提高转炉供氧强度是缩短冶炼时间的主要方法。但是，供氧强度的增加会增加熔炼过程的飞溅率。因此，平衡这两种现象是许多学术和冶金研究的内容。然而，关于双参数氧枪喷嘴O ₂  + CO _{2混合喷射特性的研究很少。}在本研究中，环境温度和气体流速对 92% O ₂  + 8% CO _{2特性的影响}通过模拟观察混合射流，并使用 Ansys Fluent 商业软件进行分析。结果表明，在1773 K环境温度下，新型双参数氧枪喷嘴各射流的混合度低于传统氧枪喷嘴。此外，新型喷嘴的射流独立性优于传统喷嘴。在相同距离下，射流的撞击面积较大。通过将新型双参数氧枪喷嘴的供气流量提高5000 Nm ³ /h，熔池的平均流速提高了～9%。结合CO ₂熔炼的优点，新型双参数喷嘴可提高供氧强度，抑制飞溅。