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程功,操瑞宏,廖建军,等. KR法脱硫中搅拌工艺与桨叶尺寸对脱硫剂分散行为的影响[J]. 安徽工业大学学报(自然科学版),2024,41(4):1-9. doi: 10.12415/j.issn.1671-7872.24077
引用本文: 程功,操瑞宏,廖建军,等. KR法脱硫中搅拌工艺与桨叶尺寸对脱硫剂分散行为的影响[J]. 安徽工业大学学报(自然科学版),2024,41(4):1-9. doi: 10.12415/j.issn.1671-7872.24077
CHENG Gong, CAO Ruihong, LIAO Jianjun, ZHONG Wei, LING Minghui, WANG Haijun. Effect of Stirring Process and Blade Size on Dispersion Behavior of Desulfurizer in KR Desulfurization[J]. Journal of Anhui University of Technology(Natural Science). DOI: 10.12415/j.issn.1671-7872.24077
Citation: CHENG Gong, CAO Ruihong, LIAO Jianjun, ZHONG Wei, LING Minghui, WANG Haijun. Effect of Stirring Process and Blade Size on Dispersion Behavior of Desulfurizer in KR Desulfurization[J]. Journal of Anhui University of Technology(Natural Science). DOI: 10.12415/j.issn.1671-7872.24077

KR法脱硫中搅拌工艺与桨叶尺寸对脱硫剂分散行为的影响

Effect of Stirring Process and Blade Size on Dispersion Behavior of Desulfurizer in KR Desulfurization

  • 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软件中的多相流模型(VOF)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。数值分析发现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1 440 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1 540 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1 440 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。

     

    Abstract: 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 multiphase flow model (VOF) 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.The numerical analysis reveals the presence of 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 1 440 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 1 540 mm, the central part of the upper surface of the impeller is exposed, indicating that excessive blade diameter is prone to entrain air and reduce the yield of iron. The blade is close to the wall of the molten iron ladle, which can increase the erosion effect of the fluid on the wall of the molten iron ladle and damage the working life of the molten iron ladle. According to the comprehensive stirring effect and the dispersion degree of desulfurizer, the particle mixing and desulfurization agent dispersion effect are better when the impeller diameter is 1 440 mm, and the optimal diameter ratio between the stirring blade and the molten iron ladle is 0.401.

     

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