铁口数对高炉炉缸铁水环流的影响
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摘要
高炉炉缸内高温液态渣铁的环流冲刷是造成炉缸、炉底侵蚀的重要原因之一。由于炉缸内状况属于"黑匣子",目前其内部铁水流动状况没有直接准确的测定方法。基于计算流体力学,在炉缸内不同死料柱的状态下,单、双铁口出铁时,对炉缸内铁水流动行为进行研究,得到炉缸内铁水流线、速度分布情况。模拟结果显示,单铁口或夹角为40°的双铁口出铁时,在死料柱沉坐且中心为碎焦的状态下,炉缸内铁水环流最严重;双铁口同时出铁时,选择铁口夹角为钝角的出铁方式,可以减少铁水对炉缸、炉底的冲刷;死料柱沉坐会加剧炉缸铁水环流,死料柱浮起有利于减缓炉缸铁水环流,但是加剧了其在炉底的流动。
The circumferential flow of hot metal has a significant influence on the hearth erosion.Because the situation of the hearth is"black box",there is no direct examine method for the hot metal flow.Based on the computational fluid dynamics,the streamline and velocity were studied with different deadman conditions and different tapholes.The results show that when the hot metal tap with single or double tapholes(with the angle of 40°)and the deadman is at the sitting condition whose center is fine coke,the circulating hot metal is the most serious in the hearth.When the hot metal tap with double tapholes(with the obtuse angle),the circumferential flow of hot metal is weakened.The sitting deadman could strengthen the hot metal circulution.However,the floating deadman could weaken hot metal circulution,but it strengthens the hot metal flow of the bottom.
The circumferential flow of hot metal has a significant influence on the hearth erosion.Because the situation of the hearth is"black box",there is no direct examine method for the hot metal flow.Based on the computational fluid dynamics,the streamline and velocity were studied with different deadman conditions and different tapholes.The results show that when the hot metal tap with single or double tapholes(with the angle of 40°)and the deadman is at the sitting condition whose center is fine coke,the circulating hot metal is the most serious in the hearth.When the hot metal tap with double tapholes(with the obtuse angle),the circumferential flow of hot metal is weakened.The sitting deadman could strengthen the hot metal circulution.However,the floating deadman could weaken hot metal circulution,but it strengthens the hot metal flow of the bottom.
引文
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[2]李玉,陈良玉,沈峰满,等.高炉炉缸三维稳态出铁模型[J].东北大学学报:自然科学版,2009,30(5):692.(Li Y,Chen L Y,Shen M F,et al.Three-dimensional numerical model of blast furnace hearth in tapping process[J].Journal of Northeastern University:Natural Science,2009,30(5):692.)
[3]Huang C E,Du S W,Cheng W T.Numerical investigation on hot metal flow in blast furnace hearth through CFD[J].ISIJ International,2008,48(9):1182.
[4]王平,别威.高炉炉缸铁水流场数值模拟[J].金属材料与冶金工程,2011,39(1):22.(Wang P,Bie W.Numerical simulation of flow field of hot metal for hearth of blast furnace[J].Metal Materials and Metallurgy Engineering,2011,39(1):22.)
[5]邵磊,徐辉,余珊,等.高炉炉缸内铁水流动特性的物理模拟[J].材料与冶金学报,2009,8(1):1.(Shao L,Xu H,Yu Set al.Physical modelling of hot metal flow in a BF hearth[J].Journal of Materials and Metallurgy,2009,8(1):1.)
[6]朱进锋,赵宏博,程树森,等.高炉炉缸死焦堆受力分析与计算[J].北京科技大学学报,2009,31(7):906.(Zhu J F,Zhao H B,Cheng S S,et al.Force analysis and calculation of deadman in a blast furnace hearth[J].Journal of University of Science and Technology Beijing,2009,31(7):906.)
[7]储满生,王宏涛,柳政根,等.高炉炼铁过程数学模拟的研究进展[J].钢铁,2014,49(11):1.(Chu M S,Wang H T,Liu Z G,et al.Research progress on mathematical modeling of blast furnace ironmakingprocess[J].Iron and Steel,2014,49(11):1.)
[8]王平,别威,龙红明.高炉炉缸内不同死料柱状况对铁水流场的影响[J].安徽工业大学学报:自然科学版,2011,28(2):103.(Wang P,Bie W,Long H M.Influence of different deadman at flow field of hot metal in hearth[J].Journal of Anhui University of Technology:Natural Science,2011,28(2):103.)
[9]Pintowantoro S,Nogami H,Jun-Ichiro Y.Numerical analysis of static holdup of fine particles in blast furnace[J].ISIJ International,2004,44(2):304.
[10]Takatani K,Inada T,Takata K.Mathematical model for transient erosion process of blast furnace hearth[J].ISIJ International,2001,41(10):1139.
[11]Adilson D C J,Junichiro Y.Transient mathematical model of blast furnace based on multi-fluid concept,with application to high PCI operation[J].ISIJ International,2000,40(7):637.
[12]Richard A P,Nogami H,Jun-Ichiro Y.A mathematical model for blast furnace reaction analysis based on the four fluid model[J].ISIJ International,1997,37(8):748.