氧气斜吹转炉氧枪喷嘴的优化及应用

Optimization and Application of Oxygen Lance Nozzle for Oxygen Oblique Blowing Converter

针对氧气斜吹转炉氧枪喷嘴作业效率低、耗氧量大等问题,优化氧枪喷嘴,重新选用缩扩型拉瓦尔喷管结构,通过初步计算喷嘴内部型面尺寸,结合仿真模拟,获得最优马赫数的喷嘴轮廓,再采用工业试验进行验证,最终选出符合生产的氧枪喷嘴。优化改进后的氧枪喷嘴提高了氧枪出口氧气流速,使出口流速达到超音速状态,增加对熔池冲击深度及接触反应面积,提高反应效率,缩短单炉作业周期,降低了氧气单耗。

Aiming at the problems,including low operating efficiency and large oxygen consumption,of the oxygen lance nozzle of the oxygen oblique blowing converter,the oxygen lance nozzle was optimized,and the converging-diverging nozzle Laval nozzle structure was reselected.Through preliminary calculation of the internal profile size of the nozzle and combining with analogue simulation,optimum nozzle profile to generate optimum Mach number was obtained and then verified by industrial tests,finally an oxygen lance nozzle in line with the production was selected.After optimization and improvement,the oxygen flow rate in the outlet of oxygen lance's nozzle was improved,which made the flow rate in outlet reach a supersonic state and the impacting depth on the molten pool and the contact reaction area increases,thus the reaction efficiency was improved,the operating cycle of a single furnace was shortened,and the unit oxygen consumption was reduced.