Physical Simulation and Industrial Testing of Bottom-Blown O2-CaO Converter for Steelmaking Process

Li, Weifeng; Zhu, Rong; Dong, Kai; Zhang, Jie; Feng, Chao; Han, Baochen; Wu, Xuetao

doi:10.1007/s11663-020-01823-x

Cited by 22 publications

(10 citation statements)

References 11 publications

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“…In addition, Li's research has found that the mixing time is basically no longer shortened after the solid-gas ratio reaches 9. 18) Therefore, when there are fewer particles to be sprayed, a relatively low solid-gas ratio can shorten the mixing time and prolong the impact of the particle-carrier gas on the molten steel. Reducing the particle size is beneficial to increase the area of the reac-tion interface, however, it can be found from Fig.…”

Section: The Influence Of Powder Spraying On the Flowmentioning

confidence: 99%

“…[14][15][16][17] Considering the complexity of limestone spraying at the bottom of the converter, some researchers have studied the movement characteristics of powder in the molten pool by means of physical simulation in recent years. [18][19][20] However, the approximate motion trajectory of the powder in the molten pool can be observed by means of physical simulation, but it is difficult to quantitatively analyze the distribution characteristics of particle concentration and the spatial distribution of particles of different sizes. 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.…”

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: The Influence Of Powder Spraying On the Flowmentioning

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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“…The stirring effect of converter bottom blowing is determined by several main parameters, including the bottom blowing intensity, bottom blowing nozzle arrangement and quantity. Some scholars have studied these key parameters to reduce the dead zone ratio of the converter molten pool and improve the mixing degree of the combined blown converter [9][10][11][12]. For the study of the bottom blowing strength, scholars generally believe that the stirring effect of molten steel increases with the increase of the bottom blowing flow rate.…”

Section: Introductionmentioning

confidence: 99%

Optimisation of the bottom blowing process for a 200 t converter

Yuan

et al. 2022

Ironmaking & Steelmaking

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In the converter steelmaking process, bottom blowing stirring is essential for the molten pool mixing effect of the top-bottom combined blown converter. In this study, ANSYS FLUENT19.3 commercial software is used to investigate the effect of bottom blow nozzle flow and arrangement on kinetic conditions of the converter by coupling the volume of fluid and discrete particle models. Gas is injected into the molten pool from the bottom blow nozzle, forming an inverted conical velocity distribution. As the bottom blowing intensity increases from 0.04 to 0.15 Nm 3 t -1 •min -1 . The mixing time and dead zone ratio are reduced accordingly; the minimum mixing time is 48.4 s, and the minimum dead zone area ratio is 24.43%. The converter achieves good fluidity when the bottom nozzle is arranged at Case A. The simulation results are verified by a water model experiment with a 1:8 ratio of the model and prototype converters.

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“…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. [ 37 ] However, due to a lack of reports, the current understanding of how some injection parameters affect the powder distribution and molten bath is incomplete.…”

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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Physical Simulation and Industrial Testing of Bottom-Blown O2-CaO Converter for Steelmaking Process

Cited by 22 publications

References 11 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

Optimisation of the bottom blowing process for a 200 t converter

Physical Simulation of Powder Spraying at the Bottom of a Converter

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