Three types of impellers are developed to improve reagent efficiency in the desulfurization process of hot metal by kanbara reactor stirring method. The movement and dispersion behavior of particles are investigated using the CFD technology. The flow structure, particle volume fraction distribution and mixing time are taken as the characteristics to describe the entrainment ability and mixing ability of the impellers. The results show that the square center impeller (impeller B) improves the flow structure of the molten iron, and makes the volume fraction distribution of the particles much better than that of the traditional impeller (impeller A), the mixing time is the shortest among the three impellers under the same operating parameters. The blades with downward angle (impeller C and impeller D) improve the mixing effect of the region below the impeller, and the impeller C is more sensitive to the change of rotation speed.
Get full access to this article
View all access options for this article.
References
1.
WanXF.Development and current situation of desulfurization process for hot metal. Angang Tecnol. 2018;413(5):8–15.
2.
WenGHXuSXiCCet al.Research progress on efficiency techniques for desulfurization flux in hot metal with KR process. Steelmak. 2016;32(3):1–7.
3.
YinCLYangLMTianCYet al.Analysis of KR hot metal desulfurizer escaped and slag agglomeration in agitator. Iron Steel. 2020;55(1):34–37 + 71.
4.
XiaoLWChenKSDanBBet al.Numerical study of flow field on molten iron desulfurization with mechanical stirring. Adv Mech Eng. 2016;8(7):1–11.
5.
ZhouYJLuYChenMHet al.Numerical simulation of solid-liquid suspension characteristics in a stirred tank with improved INTER-MIG impeller. Chin J Proc Eng. 2014;14(5):744–750.
6.
SukawaTIguchiM.Promotion of uniform dispersion of fine particles into a mechanically agitated steel bath. ISIJ Int. 2005;45(8):1145–1150.
7.
NakaiYSumiIKikuchiNet al.Powder blasting in hot metal desulfurization by mechanical stirring process. ISIJ Int. 2017;57(6):1029–1036.
8.
NakaiYHinoYSumiIet al.Effect of flux addition method on hot metal desulfurization by mechanical stirring process. ISIJ Int. 2015;55(7):1398–1407.
9.
NakaiYSumiIMatsunoHet al.Effect of flux dispersion behavior on desulfurization of hot metal. ISIJ Int. 2010;50(3):403–410.
10.
TanakaRUddinAMKatoY.Flow characteristics related to liquid/liquid mixing pattern in an impeller-stirred vessel. ISIJ Int. 2018;58(4):620–626.
11.
MatsuiANakaiYKikuchiNet al.Effect of bottom inclination vessel on particle entrainment behavior with mechanical stirring. Tetsu-to-Hagané. 2013;99(7):458–467.
12.
HeMWangNChenMet al.Distribution and motion behavior of desulfurizer particles in hot metal with mechanical stirring. Powder Technol. 2020;361:455–461.
13.
FilipeMTCarlosASItavahnASet al.An evaluation of gas injection effedts in a mechanically stirred hot metal desulfurization system. Tecnol Metal Mater Miner. 2017;14(3):204–210.
14.
WuWWuWHuYet al.Physical simulation of new desulphurization technology using pulsed and rotary stirring-injection. J Iron Steel Res Int. 2008;15(1):15–18.
15.
JiJHLiangRQHeJC.Simulation on mixing behavior of desulfurizer and high-sulfur hot metal based on variable-velocity stirring. ISIJ Int. 2016;56(5):794–802.
16.
ItoKYamamotoNKuranagaS.The evaluation of the mixing properties of the mechanically stirred cylindrical vessel. ISIJ Int. 2006;46(12):1791–1794.
17.
MinCFDanBBNiuYQet al.Improving the stirring effect of KR desulfurization by baffles: a numerical analysis. J Wuhan Univ Sci Tecnol. 2020;43(5):340–345.
18.
LuoAZOuyangDGLiMHet al.Research on WG-3Y stirrer for KR desulfurization with water model experiments. Iron Steel Res. 2012;40(5):31–34.
19.
ShaoPZhangT-AZhangZet al.Numerical simulation on gas-liquid flow in mechanical-gas injection coupled stirred system. ISIJ Int. 2014;54(7):1507–1516.
20.
LiuBZhengYChenMet al.CFD simulation of the mixing and dispersing of floating particles in a viscous system. Braz J Chem Eng. 2017;34(4):1175–1189.
21.
ShihTLiouWWShabbirA.A new k-ϵ eddy viscosity model for high Reynolds number turbulent flows. Comput Fluids. 1995;24(3):227–238.
22.
LaunderBESpaldingDB.The numerical computational of turbulent flows. Comput Method Appl. 1974;3(2):269–289.
23.
LunCKKSavageSBJeffreyDJet al.Kinetic theories for granular flow: inelastic particles in couette flow and slightly inelastic particles in a general flow field. J Fluid Mech. 1984;140:223–256.
24.
GidaspowDBezburuahRDingJ.Hydrodynamics of circulating fluidized beds, kinetic theory approach. Fluidization VII. Proceedings of the 7th engineering foundation conference on fluidization; 1992; Brisbane, Australia. 75–82.
25.
AriyaranteWKHRatnayakeCMelaaenMC.CFD modeling of dilute phase pneumatic conveying in a horizontal pipe using Euler-Euler approach. Particul Sci Technol. 2019;37(8):1015–1023.
26.
LohaCChattopadhyayHChatterjeePK.Euler-Euler CFD modeling of fluidized bed: influence of specularity coefficient on hydrodynamic behavior. Partic. 2013;11(6):673–680.
27.
DingJGidaspowD.A bubbling fluidization model using kinetic theory of granular flow. AIChE J. 1990;36(4):523–538.
28.
MeiRKlausnerJF.Shear lift force on spherical bubbles. Int J Heat Fluid Flow. 1994;15(1):62–65.
