135t LF钢包炉底吹氩混匀时间及临界流量的物理模拟
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摘要
以某钢厂135 t LF钢包底吹氩为原型,建立了模型和原型比为1∶3.4的钢包水力学模型,研究了透气砖布置方式和吹氩流量对钢液混匀时间的影响。试验表明,单吹工艺中,0.3 R与0.4 R下的混匀时间分别为42.7 s、43.3 s,且对壁面的冲刷作用最弱;双吹工艺中,大角度(不小于120°)工艺比小角度工艺的混匀效果更好,0.5 R~120°透气砖布置时混匀时间最短,为35.7 s。相同流量下,单吹混匀时间略低于双吹。由于双吹工艺下气体分流,对包壁的冲刷明显好于单吹工艺。综合考虑,宜采用双吹工艺模式,原型的最佳透气砖布置方案为0.5 R~120°。单吹工艺的最佳吹氩流量为500 L/min,双吹工艺的最佳吹氩流量为600 L/min。
Based on a prototype of 135 t LF ladle bottom argon-blowing in a steel plant,the ladle hydraulics model with model and prototype ratio of 1∶3.4 was established,the effects of ventilation brick arrangement and argon flow on the mixing time of molten steel were studied. It shows that:under the single blowing process,the mixing time of 0.3 R to0.4 R ventilation brick arrangement is shortest. The mixing time of 0.3 R and 0.4 R is 42.7 s and 43.3 s respectively. In addition,the scouring effect on the wall is the weakest. Under the double blowing process,the blending effect of the large angle process(≥120°)is more significant than the small angle process. Under 0.5 R-120° ventilation brick arrangement condition,the mixing time is 35.7 s,which is shortest. Under the same flow conditions. The mixing time of the single blowing process is slightly shorter than the double blowing process. Besides,the scouring effect on the wall of double blowing process is weaker than single blowing process owing to the gas-shunting phenomenon. To summarize,the double blowing process should be adopt,the best ventilation plan for the prototype is 0.5 R-120°. The optimum argon flow rate for the single blowing process and double blowing process is 500 L/min and 600 L/min respectively.
Based on a prototype of 135 t LF ladle bottom argon-blowing in a steel plant,the ladle hydraulics model with model and prototype ratio of 1∶3.4 was established,the effects of ventilation brick arrangement and argon flow on the mixing time of molten steel were studied. It shows that:under the single blowing process,the mixing time of 0.3 R to0.4 R ventilation brick arrangement is shortest. The mixing time of 0.3 R and 0.4 R is 42.7 s and 43.3 s respectively. In addition,the scouring effect on the wall is the weakest. Under the double blowing process,the blending effect of the large angle process(≥120°)is more significant than the small angle process. Under 0.5 R-120° ventilation brick arrangement condition,the mixing time is 35.7 s,which is shortest. Under the same flow conditions. The mixing time of the single blowing process is slightly shorter than the double blowing process. Besides,the scouring effect on the wall of double blowing process is weaker than single blowing process owing to the gas-shunting phenomenon. To summarize,the double blowing process should be adopt,the best ventilation plan for the prototype is 0.5 R-120°. The optimum argon flow rate for the single blowing process and double blowing process is 500 L/min and 600 L/min respectively.
引文
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[2]曹茂雪.底吹钢包高效搅拌技术的水模型试验研究[D].沈阳:东北大学,2014.
[3]蒋星亮.70 t钢包底吹氩工艺优化及钢一渣界面行为研究[D].武汉:武汉科技大学,2013.
[4]韩建军,李士琦,吴龙.北京科技大学学报[J].2011,33(9):10.
[5]李睿,包燕平,王敏,等.40 t椭圆形钢包底吹氩水模型的研究[J].铸造技术,2015,36(5):1.
[6]卢叶,唐萍,文光华,等.透气砖布置和吹氩流量对钢包内钢液流动行为的影响[J].钢铁研究学报,2014,26(7):41.
[7]赵青松,秦哲,张明博,等.100 t钢包底吹氩混匀时间与卷渣水模拟[J].钢铁钒钛,2015,36(6):12.
[8]柴先义,汪志全,周俐.250 t LF钢包炉炉底透气砖布置模式优化水模试验[J].安徽工业大学学报:自然科学版,2011,28(4):33.
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[10]周俐.冶金传输原理[M].北京:冶金工业出版社,2009.
[11]李壮,徐东,王恩刚.板坯电磁连铸结晶器内钢/渣界面波动及流动行为的数值模拟[J].连铸,2016,41(2):1.