底吹-机械搅拌耦合铁水脱硫的模拟
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摘要
针对底吹-机械搅拌耦合铁水预处理脱硫的气体与熔体的相互作用过程,利用CFD商业软件Fluent 15.0和物理模拟的方法,针对某钢厂120 t底吹钢包脱硫过程进行实验研究,并从流场、气体体积分布等方面研究了搅拌桨结构、搅拌转速、通气流量、偏心度对铁水包内钢液混合效果的影响.结果表明:使用SSB-D桨,搅拌转速200 r/min,通气流量为1.5 m3/h,偏心度0.4时,熔池内的流场分布得更均匀,镁蒸气气泡在铁水中更加分散和细化,增加了镁蒸气与铁水的气液接触面积,提高了镁蒸气的脱硫效率.
To understand the interaction between bubble and melt in desulfurization of hot metal pretreatment with bottom blown-mechanical stirring coupled,the CFD commercial software Fluent15. 0 and physical simulation method were used to study on desulfurization process of 120 t bottom blown ladle. The influence of impeller structure,rotation speed,gas flowrate,eccentricity on the mixing effect of molten steel in ladle was investigated from the aspects of flowfield and gas volume distribution. The results showed that,under the conditions of using the SSB-D impeller,the rotation speed of 200 r/min,the gas flowrate of 1. 5 m3/h and the eccentricity of 0. 4,the flowfield distribution in the molten iron is more uniform while the magnesium vapor bubbles are more dispersed and refined in the molten iron. The gas-liquid contact area of magnesium vapor and hot metal is increased to improve the desulfurization efficiency of magnesium vapor.
To understand the interaction between bubble and melt in desulfurization of hot metal pretreatment with bottom blown-mechanical stirring coupled,the CFD commercial software Fluent15. 0 and physical simulation method were used to study on desulfurization process of 120 t bottom blown ladle. The influence of impeller structure,rotation speed,gas flowrate,eccentricity on the mixing effect of molten steel in ladle was investigated from the aspects of flowfield and gas volume distribution. The results showed that,under the conditions of using the SSB-D impeller,the rotation speed of 200 r/min,the gas flowrate of 1. 5 m3/h and the eccentricity of 0. 4,the flowfield distribution in the molten iron is more uniform while the magnesium vapor bubbles are more dispersed and refined in the molten iron. The gas-liquid contact area of magnesium vapor and hot metal is increased to improve the desulfurization efficiency of magnesium vapor.
引文
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[2]Liu B Y.Applied effects of different hot metal desulfurizing processes[J].Iron and Steel,2004,39(6):24-27.
[3]Liu Y,Zhang T A,Sano M,et al.Study on absorption rate by eccentric mechanical stirring in gas injection refining for iron and steel making[J].Journal of Iron and Steel Research,International,2011,18(sup2):166-171.
[4]欧阳德刚,王庆方,刘守堂.KR脱硫搅拌器的技术现状与发展方向[J].武钢技术,2005,43(5):55-57.)(Ouyang De-gang,Wang Qing-fang,Liu Shou-tang.Technical status and development trend of KR desulfurization agitator[J].Wuhan Iron and Steel Corporation Technology,2005,43(5):55-57.)
[5]张廷安,刘燕,赫冀成,等.原位机械搅拌炉外脱硫方法及装置:ZL20081001186303.3[P].2008-10-03.(Zhang Ting-an,Liu Yan,He Ji-cheng,et al.External furnace desulfurization method and device with in-situ mechanical stirring:ZL20081001186303.3[P].2008-10-03.)
[6]Liu Y,Sano M,Zhang T A,et al.Mechanical stirring for gas injection refining in iron and steel making:1.intensification of bubble disintegration[C]//ISIJ Meeting.Gifu:The Iron and Steel Institute of Japan,2007:786.
[7]Liu Y,Sano M,Zhang T A,et al.Mechanical stirring for gas injection refining in iron and steel making:3.eccentric mechanical stirring for bubble disintegration[C]//ISIJ Meeting.Tokyo:The Iron and Steel Institute of Japan,2008:82.
[8]Liu Y,Sano M,Zhang T A,et al.Mechanical stirring for gas injection refining in iron and steel making:4.perforated blade impeller for bubble disintegration and dispersion[C]//ISIJ Meeting.Tokyo:The Iron and Steel Institute of Japan,2008:83.
[9]Liu Y,Sano M,Zhang T A,et al.Intensification of bubble disintegration and dispersion by mechanical stirring in gas injection refining[J].ISIJ International,2009,49(1):17-23.