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powder transport behavior in RH degasser with Powder injection through up snorkel: a transient numerical model

Journal of Iron and Steel Research(International) 2023年第6期30卷 1156-1170页

作者： Zhuang Liu Wen-tao Lou Miao-yong Zhu Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819LiaoningChina School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina

A transient numerical model was established to predict the dispersion,distribution,and circulation behavior of the powder injected through the up snorkel in a Ruhrstahl–Heraeus(RH)degasser.The effects of the powder diameter,the lifting gas flow rate,and the Powder injection rate on the powder transport were investigated.Local powder concentration was measured by a cold model.The results showed that the predicted powder concentration agreed well with the measured.The Powder injection process is divided into three periods,named dispersion period,aggregation and circulation period,and dynamically stable period according to the powder transport behavior.The powder diameter has a great effect on the particle dispersion.When the particles size changes from 30 to 500μm,the powder dispersion characteristic index changes from 0.110 to 0.741,and the ladle top zone powder mass ratio changes from 0.118 to 0.685.The powder circulation mass flow rate increases to 101.0 kg min^(-1)(150μm)and then decreases to 46.6 kg min^(-1)(500μm).powders with a diameter of more than 220μm can change the steel flow mode in the RH degasser.Increasing the lifting gas flow could slightly improve the powder dispersion.Variation in the Powder injection rate has almost no effect on the powder dispersion.

关键词： RH degasser Powder injection Numerical simulation Eulerian-granular flow powder transport behavior Optical probe

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KINETIC MODEL FOR Powder injection DESULFURIZATION

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Acta Metallurgica Sinica(English Letters) 2006年第4期19卷 258-264页

作者： Y. Jin X.G. Bi S.R. Yu Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry ofEducation Wuhan University of Science and Technology Wuhan 430081 China

The kinetic model for desulfurization using CaO-based Powder injection has been proposed, which accords with the actual process of the experiment. For the model, a comparison between CaO-based flux and Mg-based flux was made and the results show that the desulfurization rate of the Mg-based flux is far more than that of CaO-based flux. On the basis of the model calculation, on comparison of CaO-CaF2 flux and calcium aluminate flux, the desulfurization rates of the two fluxes are close to each other. In addition, the effects of some operational factors on the kinetics of desulfurization are discussed.

关键词： Powder injection desulfurization kinetic

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Simulation on Hot Metal Dephosphorization by Powder injection in Torpedo-Car

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Journal of Iron and Steel Research(International) 2011年第S2期18卷 69-73页

作者： LUO Zhi-guo, ZOU Zong-shu (Materials and Metallurgy School, Northeastern University, Shenyang 110004,Liaoning,China) Northeastern Univ Sch Met & Mat Shenyang 110004 Liaoning Peoples R China

Powder injection is widely used in hot metal pretreatment. The kinetic analysis of refining process shows that the reagent utilization and pretreatment efficiency are determined by the penetration ratio of powder into metal, the residence time of powder in the metal bath, as well as the uniform mixing time of the bath. The characterization of these parameters is studied with water model experiment, and, a mathematical model is developed for hot-metal dephosphorization in torpedo car. Water-model experiment results and industrial data are used to determine the model parameters and verify this model, the results show that the prediction from the model agrees well with practical results.

关键词： uniform mixing time penetration ratio residence time hot metal dephophorization Powder injection

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