Jet Behavior and Metallurgical Performance of Innovated Double-Parameter Oxygen Lance in BOF

Yuan, Zhangfu; Yang, Xiao; Zhixing, Lu; Huang, Jiang-ning; Pan, Yingling; Enxiang, MA

doi:10.1016/s1006-706x(07)60034-x

Cited by 21 publications

(18 citation statements)

References 1 publication

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“…Wenjing WANG, 1,2) Zhangfu YUAN, 1) Hiroyuki MATSUURA, 3) Hongxin ZHAO, 2) Cheng DAI 1) and Fumitaka TSUKIHASHI 3) under the commercial conditions to analyses their essentials in detail, for example the jet coalescence pattern. As imagined, the jet coalescence, if it occurs, reduces the impact of the individual jet as the jets engulf a huge mass of ambient medium.…”

Section: Three-dimensional Compressible Flow Simulation Of Top-blown mentioning

confidence: 99%

“…Therefore, jets behavior under their designed conditions, such as correct pressure, flow rate, and Mach number, is a crucial factor to obtain a good understanding of the underlying fluid dynamics in the BOF in order to optimize the involved kinetics. In many researches, [1][2][3][4][5] behaviors of the single jet through one nozzle or the multiple jets through the multi-nozzles have been investigated from an experimental point of view. With the help of Pitot tube, these experimental measurements are effective to directly know the jet behavior, for example the velocity field distribution, but under the condition of a small laboratory model it is very difficult to predict it on a commercial basis which is characteristic of more complex environment, such as high Mach number and high temperature.…”

Section: Introductionmentioning

confidence: 99%

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Three-dimensional Compressible Flow Simulation of Top-blown Multiple Jets in Converter

et al. 2010

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A three-dimensional mathematical model has been developed to simulate the compressible jets flow from the top-blown lance with multi-nozzles in converter to a free surrounding domain. The variations of fluid density and viscosity, high temperature, and Mach number were taken into consideration in this model which was validated against the physical modeling results. More specifically, computations were obtained to compare the widely used realizable k-e turbulence model against the standard k-w turbulence model, which shows that the latter one is superior to calculate diverse turbulent conditions within the multiple jets. Moreover, the coalescence pattern of the multiple jets has been illustrated by their Mach number distribution, and each individual jet proceeds in a curve course, bending to the lance center and tending to unite. The effects of the inclination angles on the jets coalescence were also investigated, which indicates that the lower the inclination angle is, the stronger the interfering extent between the multiple jets is. With the help of this model, the dynamic power of the multiple jets to support the cavity formation was demonstrated, and additionally, a mathematical model concerning the effective penetration radius and digressing path of the multiple jets was proposed by taking the inclination angle and the axial distance from the nozzle tips as arguments.KEY WORDS: BOF; top blowing; multiple jets; coalescence; inclination angle; CFD; turbulence model; three dimensional simulation. 491© 2010 ISIJ under the commercial conditions to analyses their essentials in detail, for example the jet coalescence pattern. As imagined, the jet coalescence, if it occurs, reduces the impact of the individual jet as the jets engulf a huge mass of ambient medium. Jet coalescence is thus considered detrimental. Furthermore, wide ranges of Reynolds and Mach numbers in the converter strengthen the complex characteristics of the jets. In order to study the pattern of the jets interference extent and their influence on the metal bath, there are a lot of efforts required to make in the establishment of an accurate numerical method for the multiple jets in the LD vessel.This article proposes a three-dimensional mathematical model aimed to simulate the supersonic free-surrounding jets flow from a lance assumed under the converter conditions, which is verified with physical modeling data.12) A 4-De-Laval-nozzles lance with prescribed nozzle configurations was put into use with inclination angles of 10°, 12°a nd 14°. First, this computational model and its mathematical equations are described. Thereafter, the final 3D simulating results of the jet regimes as well as physical data or semi-analytical method for confirming the model are presented. Finally, the fluid flow field of characteristic parameters, the jet coalescence pattern, and the usefulness of these results on an augmented knowledge for a top-blown process are discussed. Computational Model 2.1. Numerical AssumptionsIn order to formulate the transport equations for ...

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Section: Three-dimensional Compressible Flow Simulation Of Top-blown mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Three-dimensional Compressible Flow Simulation of Top-blown Multiple Jets in Converter

et al. 2010

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“…[1][2][3][4][5][6][7][8][9][10][11][12] Ersson et al 1,2) employed both water-model experiments and mathematical modeling to study the effects of the top-blown jet on the steel bath in a LD converter. Also, Hirata et al 3) showed the stirring effect induced by top and side blown oxygen and bottom blown nitrogen converter.…”

Section: Introductionmentioning

confidence: 99%

“…Naito et al 6) investigated jet incorrect expansion and multiple jets behaviors by cold and hot model experiments. Yuan et al 7) utilized a small-scale measurement with a double-parameter lance equipped to study the jet velocity and its deviation from the jet centerline. It was shown that by using the double-parameter lance the metallurgical performance could be improved.…”

Section: Introductionmentioning

confidence: 99%

Mathematical Comparison of Two VOD Nozzle Jets

2011

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Studies of physical phenomena in a jet caused by VOD (Vacuum Oxygen Decarburization) nozzles have been carried out. The VOD process is a metallurgical process where the steel-making route is controlled under vacuum environment with oxygen top blowing. In this work, two VOD nozzle models have been employed for an investigation based on two real De Laval geometries used in industry. Numerical modeling was used to study oxygen blowing states of the nozzles at different temperatures and ambient pressures. The nozzle models were numerically computed with two dimensional domains, where vacuum conditions and temperatures were specifically defined. The modeling results showed that one of the nozzles was more applicably proper for lower pressures, displaying a more stable flow pattern. Furthermore, it was found that a change in ambient pressure has a stronger effect on the jet force than a change in ambient temperature. In addition, it was proved that the profiles of the dynamic pressure at a certain blowing distance fit well to Multi-Gaussian curves.

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“…In the metallurgical process of steelmaking, jet behaviors and metallurgical performance of an innovated doubleparameter oxygen lance have already been investigated, 1) which makes great contribution to BOF steelmaking. Moreover, it is promising to understand the multiple jets behavior in a top-blown converter and extrapolate the cavity formation in the LD bath.…”

Section: Introductionmentioning

confidence: 99%

Wettability between Molten Slag and MgO–C Refractories for the Slag Splashing Process

Yuan

Zhao

et al. 2013

ISIJ Int.

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Wetting experiments in two cases have been carried out to measure the wettability between molten slag and MgO-C refractories. Especially, the variations of wettability with time are taken into consideration in this paper. The spread diameter increased significantly and the slag height decreased with the increase of the time from 0 to 237 s at 1 783 K. While the spread diameter changed slowly, and reached the steady state from 300 to 500 s. More specifically, the fitting formulae for diameter, height, area of the slag as a function of time have been determined. Moreover, the interfacial characteristics of the non-melting slag and MgO-C refractories and of the wetting slag and MgO-C refractories were investigated to further explain the wettability in two cases.With the help of the wetting experiment, adhesion and protection mechanism was demonstrated. It could optimize the slag splashing process and give guides to the increase of the converter lining life, which can make the contribution to the promotion of technological transformation and innovation of the steel industry.

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Jet Behavior and Metallurgical Performance of Innovated Double-Parameter Oxygen Lance in BOF

Cited by 21 publications

References 1 publication

Three-dimensional Compressible Flow Simulation of Top-blown Multiple Jets in Converter

Three-dimensional Compressible Flow Simulation of Top-blown Multiple Jets in Converter

Mathematical Comparison of Two VOD Nozzle Jets

Wettability between Molten Slag and MgO–C Refractories for the Slag Splashing Process

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