Research on coherent jet oxygen lance in BOF steelmaking process

Lv, Ming; Zhu, Rong

doi:10.1051/metal/2019020

Cited by 26 publications

(17 citation statements)

References 10 publications

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“…They put forward the cavity shape index and considered that the depth and width of the cavity should be limited nearly equally. Ming Lv and Rong Zhu analyzed the flow field and radius of traditional oxygen jet and coherent jet and studied the influence of annular gas flow rate on the central jet velocity [22]. The conclusion showed that the supersonic region of the jet increases with increasing annular gas flow rate.…”

Section: Introductionmentioning

confidence: 99%

Behavior of Top-Blown Jet under a New Cyclone Oxygen Lance during BOF Steelmaking Process

Li¹,

Ma²,

Chen³

et al. 2022

Processes

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An oxygen lance is the operation unit that generates supersonic oxygen jets, controls their behavior, and acts as a vital role in the steelmaking process. It is thought that airflow similar to a tornado may suppress upward splashing because of part of the jet pressure shifting from the axis of the oxygen lance to the tangential direction. Therefore, a new oxygen lance is designed to form a tornado jet, and the numerical simulation consequences are verified by the physical model. The structure of the new oxygen lance is optimized by numerical simulation results, and the comparison of simulation results before and after optimization is analyzed. On this basis, the effect of the cyclone oxygen lance on the upward splashing behavior, penetrating depth, turbulent kinetic energy, turbulent dissipation rate, and rotation of molten bath is investigated. The conclusions present that, compared with the conventional oxygen lance, the upward splashing with the cyclone oxygen lance decreases, and the penetrating depth and reaction area increase. In other words, for obtaining the same penetrating depth, the cyclone lance height can be higher than that of a conventional oxygen lance, which leads to a better protective effect on the refractories of the oxygen lance. Moreover, the average value of the turbulent kinetic energy of the cyclone nozzle is larger than that of the traditional Laval nozzle at the interface between oxygen and slag, which improves the effect of steelmaking.

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Section: Introductionmentioning

confidence: 99%

Behavior of Top-Blown Jet under a New Cyclone Oxygen Lance during BOF Steelmaking Process

Li¹,

Ma²,

Chen³

et al. 2022

Processes

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“…Oxygen lance is the key equipment for realizing supersonic gas jets. A variety of oxygen lances, such as double-channel lance, [1][2][3] coherent lance, [4][5][6][7][8] variable angle lance, [9] and nozzle-twisted lance, [10,11] can be used to achieve efficient and stable smelting. The characteristics of the gas jet were studied by analyzing the central velocity, dynamic pressure, and polymerization phenomenon between flow streams, and the stirring characteristics of the oxygen lance were studied using the mixing time and the flow field distribution in molten pool.…”

Section: Introductionmentioning

confidence: 99%

Behavior of Gas–Slag–Metal Emulsion with Nozzle‐Twisted Lance in Converter Steelmaking Process

Teng-chang

et al. 2021

steel research int.

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Oxygen lance is the key to realize the emulsification of gas–slag–metal in the converter steelmaking process, which determines successful completion of metallurgical tasks. Herein, a 3D full‐size gas–slag–metal coupling model of the nozzle‐twisted lance in a 120t converter is established. The behavioral characteristics of gas–slag–metal of nozzle‐twisted lances (swirl angle 0°/5°/10°/15°) are studied. With the increase in the swirl angle, the axial velocity is reduced; the radial and tangential velocities are increased, and the coverage area of the slag layer, the splashing amount, and its height are reduced. In the longitudinal section, when the swirl angle increases from 0° to 15°, the areas of high‐velocity and dead zones are reduced by 15% and 36%, respectively, and the area of low‐velocity zone is increased by 17%. At different depths of molten bath, with the increase in the swirl angle, the area of high‐velocity zone first increases and then decreases; the area of low‐velocity zone increases, and the area of dead zone decreases. Finally, the industrial experiment with the nozzle‐twisted lance is carried out in a 120t converter. The phosphorus content, the carbon–oxygen product, and the total iron content in slag are all reduced.

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“…[ 1,2 ] At present, research on the blowing characteristics of an oxygen lance mainly focuses on the jet dynamics, [ 3–6 ] interaction between the jet and molten pool, [ 7–9 ] and flow field distribution of the molten pool. [ 10–12 ]…”

Section: Introductionmentioning

confidence: 99%

Variation in Multiphase Flow Characteristics by Nozzle‐Twisted Lance Blowing in Converter Steelmaking Process

Xing

et al. 2021

steel research int.

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A 3D gas–slag–metal model for a 120t converter with nozzle‐twisted lance is established, and the gas jet characteristics, slag–metal interface fluctuations, wall erosion, and changes in the molten pool flow field of the nozzle‐twisted lance of the blowing process are studied. The results reveal that, with the increase in the swirl angle, the length of the jet high‐velocity section, maximum velocity, and dynamic pressure decrease, radial distance increases, and wall shear stress first decreases and then increases. With an increase in the blowing time, the fluctuating intensity of the slag surface and the molten steel surface changes significantly, fluctuating slag surface stabilizes after 1.7 s (fluctuating intensity is 1.08–1.12), and fluctuating steel surface stabilizes after 1.3 s (fluctuating intensity is 1.23–1.33). The turbulent kinetic energy of the gas–slag–metal three‐phase interaction area increases and the wall shear stress gradually increases.

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Research on coherent jet oxygen lance in BOF steelmaking process

Cited by 26 publications

References 10 publications

Behavior of Top-Blown Jet under a New Cyclone Oxygen Lance during BOF Steelmaking Process

Behavior of Top-Blown Jet under a New Cyclone Oxygen Lance during BOF Steelmaking Process

Behavior of Gas–Slag–Metal Emulsion with Nozzle‐Twisted Lance in Converter Steelmaking Process

Variation in Multiphase Flow Characteristics by Nozzle‐Twisted Lance Blowing in Converter Steelmaking Process

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