基于转炉COMI技术的二次燃烧氧枪射流运动特性研究

Study on the jet movement characteristics of post combustion oxygen lance based on converter COMI technology

设计了基于COMI(CO_(2)and O_(2)Mixing Injection)技术的三种二次燃烧氧枪与一种传统氧枪结构,并利用数值模拟方法研究不同工况下二次射流与主氧射流的相互作用特点,及对熔池的冲击搅拌能力,用于明确二次燃烧氧枪过程的工作效能,并提出二次燃烧氧枪的优选结构模式。研究结果表明随着二次喷管数量的提高,及二次射流喷孔与主氧喷管径向夹角的减小,二次射流与主氧射流的轴向交汇位置更靠近氧枪喷头。相比于传统氧枪,4孔映射式与8孔均布式二次燃烧氧枪在典型操作枪位下,其射流截面平均速度、理论冲击面积与深度均得到明显提升,可综合提升高速射流对熔池的冲击搅拌效果。但相同工况下,4孔交错式氧枪的理论冲击面积与横截面平均速度均最小,表明该二次燃烧氧枪结构抑制了高速射流对熔池的化渣效率与搅拌效果。

In this paper,three types of post combustion oxygen lance and one type of traditional oxygen lance structure based on COMI(CO_(2)and O_(2)Mixing Injection)technology are designed.The interaction characteristics of secondary jet and main oxygen jet under different working conditions,as well as the impact and stirring capacity of the molten pool are studied by using numerical simulation method to determine the working efficiency of the secondary combustion oxygen lance process.And the optimal structure mode of the secondary combustion oxygen lance is proposed.The results show that with the increase of the number of secondary nozzles and the decrease of the radial angle between the secondary jet orifice and the main oxygen nozzle,the axial intersection of the secondary jet and the main oxygen jet is closer to the oxygen lance nozzle.Compared with traditional oxygen lance,the average velocity of jet section,theoretical impact area and depth of 4-hole mapping type and 8-hole uniform secondary combustion oxygen lance are significantly improved under typical operation lance positions,which can comprehensively improve the impact and stirring effect of high-speed jet on the molten pool.However,under the same working condition,the theoretical impact area and average cross section velocity of the 4-hole staggered oxygen lance are the minimum,which indicates that the secondary combustion oxygen lance structure inhibits the slagging efficiency and stirring effect of high-speed jet on the molten pool.