Research on the Gas–Solid Jet Flow and Erosion Wear Characteristics in Bottom Injecting Lance Used for Oxygen–Lime Powder Bottom Blowing Converter

Hu, Shaoyan; Zhu, Rong; Wang, Deyong; Li, Xianglong; Wei, Guangsheng

doi:10.1007/s11663-021-02302-7

Cited by 5 publications

(4 citation statements)

References 14 publications

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“…In addition, the pressure gradient force and virtual mass force generated by the change of the liquid steel pressure and the secondary flow will also affect its trajectory. 22,29) The force experienced by a single particle can be described as: where  u is the continuous phase velocity vector,  u p is the discrete particle velocity vector, ρ is the continuous phase density, ρ p is the discrete particle velocity vector, where C v is the virtual mass force coefficient.…”

Section: Discrete Phase Equationmentioning

confidence: 99%

“…In the numerical simulation of spray metallurgy, some scholars have studied in detail the influence of powder injection speed, particle size and spray gun structure on powder distribution. [21][22][23][24] However, the current research has only obtained the particle distribution and motion trajectories in the gas-solid two-phase state, and few reports have considered the effect of molten steel on powders. In the actual powder spraying, the solid particles will move in the molten pool under the simultaneous action of carrier gas and molten steel, and the whole process includes the interaction between the carrier gas and the molten steel in the continuous phase and the complex interaction between the continuous phase and the discrete particles.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of Powder Spraying at the Bottom of Converter Based on Gas-liquid-solid Coupling Model

et al. 2022

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In this work, the powder injection process at the bottom of the converter was numerically simulated by establishing a coupled gas-liquid-solid mathematical model. The effects of powder injection speed, solidgas ratio, particle size, and injection position on the trajectory and residence time of particles in the molten pool are studied. The discrete phase and continuous phase coupling solution method is used to analyze the change of the molten pool flow field after powder injection. It is found that increasing the spraying rate can reduce the particle concentration near the liquid surface from 2.3 kg/m 3 to 1.18 kg/m 3 . Increasing the solid-gas ratio from 10 kg/m 3 to 30 kg/m 3 can increase the powder distribution ratio from 70.9% to 93.1%. The larger the size of the particles, the easier it is to stay near the liquid level, and the maximum can reach 2.13 kg/m 3 . Finally, it was also found that spraying powder at 0.7 R can make the powder more uniformly distributed in the molten pool.

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Section: Discrete Phase Equationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Powder Spraying at the Bottom of Converter Based on Gas-liquid-solid Coupling Model

et al. 2022

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“…Rather than by experimental measurement, Peng et al [6] and Hatta et al [7] numerically studied the effect of parameters such as the design Mach number of the nozzle and powder particle size on the powder particle motion velocity within a Laval nozzle. Further, the erosion to the nozzle wall induced by particle motion was predicted by Hu et al, [8] and Li et al [9]. More recently, Miyata et al [10] and Li et al [11,12] developed their mathematical models of supersonic gas-powder mixture jets, revealing the particle motion velocity and concentration distribution in the supersonic oxygen stream, as well as the effects on gas stream velocity distribution.…”

Section: Introductionmentioning

confidence: 98%

Numerical Simulation of Motion and Distribution of Powder Particles Injected from a Nozzles-Twisted Oxygen Lance in BOF Steelmaking

Sun

et al. 2023

Metals

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The pulverized lime/limestone injection by top oxygen blowing lance during the basic oxygen furnace (BOF) process has gained much interest in recent years due to its advantages in helping slag formation and consequently in promoting refining reactions such as dephosphorization. In this pneumatic process, understanding the motion behavior and distribution of the powder particles in the furnace is of importance for regulating and designing this refining system reliably and efficiently. In this study, limestone powder top blowing through a novel nozzles-twisted oxygen lance during a BOF process is proposed and the process is simulated by establishing a multi-fluid flow model. The coupled fluid flow of gaseous oxygen and liquid steel is predicted by the volume of fluid (VOF) method, and the motion of the limestone particles is tracked by the discrete phase model (DPM). The results show that the powder injection has little effect on cavity depth of the oxygen-powder mixture jets of the nozzles-twisted lance, but decreases cavity width. During the blowing process, most of the powder particles gather around hot spots while the rest are taken out of the furnace by the reflecting oxygen stream or penetrate into the molten bath. The generated swirling flow of the nozzles-twisted oxygen lance enables a decrease in the amount of the powder particles carried by the reflecting stream and going into the molten bath, through changing the motion paths of the powder particles. As a result, the concentration distribution of the powder particles in the molten bath varies. It could be suggested that for the limestone powder injection the preferred nozzle twist angle of the oxygen lance is 10° due to the favorable conditions for dephosphorization.

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“…Based on the complexity of the powder spraying process at the bottom of the converter, many researchers have studied the effects of powder spraying speed, solid-gas ratio, and powder size on the powder distribution by means of numerical simulation. [33][34][35][36] However, most of these studies focused on the gas-solid two-phase, and there are few reports on the effect of carrier gas and powder on molten iron. In terms of water simulation research, some scholars established a physical model of powder spraying at the bottom of the converter and studied the influence of carrier gas and powder on mixing time, as well as the law of powder movement in molten iron.…”

Section: Introductionmentioning

confidence: 99%

Physical Simulation of Powder Spraying at the Bottom of a Converter

Yang

Wang

Liu

et al. 2022

steel research int.

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Herein, a converter model is established to study the powder spraying process. The effects of powder spraying speed, solid–gas ratio, particle size, and powder spraying position on the distribution of powder in a molten bath and the molten iron splash on a liquid surface are quantitatively studied by using image technology. Increasing the carrier gas flow to 2 m3 h−1 can effectively promote the movement and mixing of the powder in the molten bath, but at the same time, this leads to a degree of splash of 50.61% above the molten bath. A similar situation occurs with increasing solid–gas ratio and decreasing particle size. However, as the powder injection position is gradually moved away from the center of the furnace bottom, the powder distribution before 3 s is more advantageous, and the degree of splash decreases from 25.39 to 12.40%.

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Research on the Gas–Solid Jet Flow and Erosion Wear Characteristics in Bottom Injecting Lance Used for Oxygen–Lime Powder Bottom Blowing Converter

Cited by 5 publications

References 14 publications

Numerical Simulation of Powder Spraying at the Bottom of Converter Based on Gas-liquid-solid Coupling Model

Numerical Simulation of Powder Spraying at the Bottom of Converter Based on Gas-liquid-solid Coupling Model

Numerical Simulation of Motion and Distribution of Powder Particles Injected from a Nozzles-Twisted Oxygen Lance in BOF Steelmaking

Physical Simulation of Powder Spraying at the Bottom of a Converter

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