To improve the utilization efficiency of desulfurizer in the Kambala reactor liquid iron desulfurization process and prolong the life of the impeller, the height of the impeller and its optimal matching rotation speed are optimized. Through numerical simulation, the mixing effect of different height impellers under different rotation speeds is studied, the movement and distribution modes of desulfurizer particles are analyzed, the pumping capacity and power are calculated, and the influence of impeller height and optimal matching rotation speed on the desulfurization effect has been clarified. The numerical simulation results show that the optimization of impeller height and optimal matching rotation speed can improve the mixing effect. The height of the impeller increases, and its optimal matching rotation speed decreases. Based on the results, in existing models, it is recommended to run at 60 r/min with an impeller height of 800 mm for optimal mixing performance.
FengKXuAHeD, et al.Case-based reasoning method based on mechanistic model correction for predicting endpoint sulphur content of molten iron in KR desulphurization. Ironmak Steelmak2020; 47: 799–806.
2.
ZhaoYChenWChengS, et al.Mathematical simulation of liquid iron desulfurization during KR process coupled with an unreacted core model. IJMMM2022; 29: 758–766.
3.
JiaSHeZOuyangD, et al.Powder injection effect on liquid iron desulfurization behavior in the Kanbara Reactor: a transient 3D coupled numerical model. ISIJ Int2022; 62: 449–456.
4.
JiangJXiaoCYuY, et al.Effect of temperature on the oxidation behavior and occurrence of sulfur in KG slag. MMTB2023; 59: 431–441.
5.
LiQMaSFengM, et al.Energy efficiency characterization and optimization of mechanical stirring multiphase dispersion processes: applied to Kanbara reactors for liquid iron desulfurization. JMRT2023; 24: 5642–5659.
6.
SchramaFBeunderEVandenbergB, et al.Sulphur removal in ironmaking and oxygen steelmaking. Ironmak Steelmak2017; 44: 333–343.
7.
JiJLiangRHeJ. Simulation on mixing behavior of desulfurizer and high-sulfur liquid iron based on variable-velocity stirring. ISIJ Int2016; 56: 794–802.
8.
ZhangSYuQYangB. Numerical simulation and water model test of gas–liquid two-phase flow in KR desulfurization. Iron Steel Res2018; 30: 618–624.
9.
ZhangCWangNChenM. Hot slag modification with mechanical stirring: motion and dispersion characteristic of modifier particle. ISIJ Int2021; 61: 2754–2764.
10.
JiJLiDDuH, et al.Effect of impeller structure parameters on desulfurizer mixing behavior in KR desulfurization process. ISIJ Int2023; 63: 1334–1342.
11.
ChenWZhaoYCaiX, et al.Water modelling on particle dispersion during KR desulphurization process. Ironmak Steelmak2022; 49: 707–715.
12.
JiaSWangQHeZ. Effect of impeller structure parameters on desulfurizer mixing behavior in KR desulfurization process. Iron Steel Res2021; 33: 1134–1143.
13.
HeMWangNChenM, et al.Distribution and motion behavior of desulfurizer particles in liquid iron with mechanical stirring. Powder Technol2020; 361: 455–461.
14.
WangRJiaSHeZ. Numerical investigation on the effects of impeller structures in liquid iron desulfurization processes by mechanical stirring. Metals2022; 12: 229.
15.
SunZDanBNiuQ, et al.Numerical analysis of mixing flow field in KR process for desulfurization of liquid iron. Steelmaking2019; 35: 1–5.
16.
YanYSunWJiaS, , et al.Numerical simulation of the effect of impeller structure on stirring efficiency in KR method. Steelmaking2023; 39: 8–14.
17.
TripathiPKumarDSahR, et al.An improved lance design for liquid iron desulphurization. Ironmak Steelmak2017; 44: 421–429.
18.
NakaiYSumiIMatsunoH, et al.Effect of flux dispersion behavior on desulfurization of liquid iron. ISIJ Int2010; 50: 403–410.
19.
BlaisBBertrandF. CFD-DEM investigation of viscous solid liquid mixing: impact of particle properties and mixer characteristics. Chem Eng Res Des2017; 118: 270–285.
20.
ItoKYamamotoNKuranagaS. The evaluation of the mixing properties of the mechanically stirred cylindrical vessel. ISIJ Int2006; 46: 1791–1794.
21.
ShaoPZhangTLiuY, et al.Numerical simulation on fluid flow in liquid iron pretreatment. Iron Steel Res Int2011; 18: 129–134.
22.
ShaheedRMohammadianAHosseinG. A comparison of standard k-ε and realizable k-ε turbulence models in curved and confluent channels. Environ Fluid Mech2019: 543–568. doi:https://doi.org/10.1007/s10652-018-9637-1
23.
HirtCNicholsB. Volume of fluid (VOF) method for the dynamics of free boundaries. J Comput Phys1981; 39: 201–225.
24.
GuYYangWLiuZ, et al.Numerical simulation about evolution of bubble wake during bubble rise by VOF method. CIESC J2021; 72: 1947–1955.
25.
BrackbillJKothDZemachC. A continuum method for modeling surface tension. J Comput Phys1992; 100: 335–354.
26.
WangBShenSRuanY, et al.Simulation of gas-liquid two-phase flow in metallurgical process. Acta Metall Sin2020; 56: 619–632.
27.
ShinTLiowWShabbirA. A new k-ε eddy viscosity model for high Reynolds number turbulent flows. Comput Fluids1995; 24: 227–258.
GidaspowDBezburuahRDingJ. Hydrodynamics of circulating fluidized beds, kinetic theory approach. Fluidization VII. Proceedings of the 7th engineering foundation conference on fluidization; 1992; 75–82.
30.
MeiRKlausnerJ. Shear lift force on spherical bubbles. Int J Heat Fluid Flow1994; 15: 62–65.
31.
DrewDLaheyR. The virtual mass and lift force on a sphere in rotating and straining inviscid flow. Int J Multiphase Flow1987; 13: 113–121.
32.
TanakaRUddinAKatoY. Flow characteristics related to liquid/liquid mixing pattern in an impeller-stirred vessel. ISIJ Int2018; 58: 620–626.
33.
LiQMaSShenX, et al.Effects of impeller rotational speed and immersion depth on flow pattern, mixing and interface characteristics for Kanbara reactors using VOF-SMM simulations. Metals2021; 11: 1596–1612.
34.
DongJZhangLZhaoY, et al.Mixing phenomena of liquid iron in KR desulfurization process using water modeling. Iron Steel Res2021; 33: 103–109.
35.
LiuL. Introducing the main equipment of KR method desulfuration and the calculation of the parameters. Steelmaking2002; 18: 16–20.
