摘要
根据相似理论,按模型与原型尺寸的1:5建立铁水包物理模型,用于进行固液两相流实验,研究搅拌桨插入深度与转速对铁水包内粒子分散行为的影响;在此基础上,采用Fluent软件中的流体体积(VOF)模型与离散相模型(DPM)模拟分析桨叶尺寸对铁水包流场及脱硫剂分散效果的影响。结果表明:搅拌桨插入深度为95~125 mm时,随插入深度的增加,铁水包底部的粒子数先增后减;插入深度在105~115 mm区间粒子分散效果较好。转速为112~180 r/min时,随转速的增加,铁水包底部的粒子数先明显增多后略有减少;转速大于180 r/min时,底部粒子数基本不受转速影响,粒子混合效果较好的物理模拟工况为搅拌桨插入深度115 mm、转速147 r/min。旋转桨叶下方存在弱流区,流场速度低于0.4 m·s^(-1),增加桨叶直径,流场整体速度增加,漩涡深度加深,弱流区有减小趋势;桨叶直径超过1440 mm时,弱流区基本不变,同时随桨叶直径的增加,铁水包底部区域脱硫剂含量增加,有利于提高脱硫剂利用率,节约成本;桨叶直径为1540 mm时,搅拌桨上表面中心部分裸露,桨叶直径过大易出现卷吸空气的现象,降低铁的收得率;桨叶距离铁水包包壁较近,会增大流体对铁水包壁面的冲刷作用,有损铁水包的工作寿命。综合搅拌效果与脱硫剂分散程度,搅拌桨直径1440 mm时粒子混合与脱硫剂分散效果较好,搅拌桨桨叶与铁水包最优直径比为0.401。
According to the similarity theory,a physical model of molten iron ladle was established at a ratio of 1∶5 between the model and the prototype size,which was used for solid-liquid two-phase flow experiments to study the influence of the insertion depth and speed of the stirring blade on the particle dispersion behavior inside the molten iron ladle.On this basis,the volume of fluid(VOF)model and discrete phase model(DPM)in Fluent software were used to simulate and analyze the influence of blade size on the flow field of hot metal ladle and the dispersion effect of desulfurizer.The results show that when the insertion depth of the impeller is 95–125 mm,with the increase of the insertion depth,the number of particles at the bottom of the ladle increases first and then decreases,and the particle dispersion effect is better in the insertion depth range of 105-115 mm.When the rotational speed is 112-180 r/min,with the increase of rotational speed,the number of particles at the bottom of the ladle increases significantly and then decreases slightly.When the rotational speed is greater than 180 r/min,the number of particles at the bottom is basically not affected by the rotational speed.The physical simulation conditions with better particle mixing effect are the insertion depth of the impeller 115 mm and the rotational speed 147 r/min.There is a weak flow zone below the rotating blade,with a flow velocity below 0.4 m·s^(−1).With the increase of the blade diameter,the overall velocity of the molten iron increases,the depth of the vortex deepens,and the range of the weak flow zone decreases.When the blade diameter exceeds 1440 mm,the weak flow zone remains basically unchanged.At the same time,with the increase of blade diameter,the content of desulfurizer in the bottom area of hot metal ladle increases,which is beneficial to improve the utilization rate of desulfurizer and save cost.When the blade diameter is 1540 mm,the central part of the upper surface of the impeller is exposed,indicating that excessive blade di
作者
程功
操瑞宏
廖建军
钟巍
李明晖
王海军
CHENG Gong;CAO Ruihong;LIAO Jianjun;ZHONG Wei;LI Minghui;WANG Haijun(School of Metallurgical Engineering,Anhui University of Technology,Maanshan 243032,China;Silicon Steel&Sheet Business Division,Xinyu Iron and Steel Group Co.,Ltd,Xinyu 338001,China)
出处
《安徽工业大学学报（自然科学版）》
CAS
2024年第4期457-465,共9页
Journal of Anhui University of Technology（Natural Science）
基金
国家自然科学基金项目(518040032,52374316)
安徽省高校自然科学基金重点项目(2022AH050291)。
关键词
KR脱硫
脱硫剂
分散行为
桨叶
数值模拟
硅钢
新能源
KR desulfurization
desulfurizer
dispersion behavior
blade
numerical simulation
silicon steel
new energy
