Effect of Nozzle Twisted Lance on Jet Behavior and Spitting Rate in Top Blown Process

Higuchi, Yoshihiko; Tago, Yukari

doi:10.2355/isijinternational.43.1410

Cited by 35 publications

(20 citation statements)

References 5 publications

(6 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The characteristic of the supersonic jet flow has been investigated by many researchers through cold model experiments. [1][2][3][4] However, there were few studies on the jet behavior under high ambient temperature condition. SUMI et al 5) researched the supersonic oxygen jet behavior at 285 K, 772 K and 1 002 K by hot model experiments.…”

Section: Introductionmentioning

confidence: 99%

Temperature Corrected Turbulence Model for Supersonic Oxygen Jet at High Ambient Temperature

Zhang

Cang

2017

ISIJ Int.

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Temperature Corrected Turbulence Model for Supersonic Oxygen Jet at High Ambient Temperature

Zhang

Cang

2017

ISIJ Int.

View full text Add to dashboard Cite

“…But there is no research on effects of the geometry size and jet characteristics of swirl‐type oxygen lance on converter vanadium extraction. The swirl‐type oxygen lance generates not only axial and radial force, but also tangential force,5–7 so it can improve stirring effect on molten pool of oxygen jet. In addition, the impacting depth of swirl‐type oxygen lance is small, so it can restrain the decarburization reaction, which is beneficial to keep carbon and to extract vanadium.…”

Section: Introductionmentioning

confidence: 99%

Simulation and Application of Swirl‐Type Oxygen Lance in Vanadium Extraction Converter

Zhu

Wang

et al. 2012

steel research int.

View full text Add to dashboard Cite

Stirring effects and impacting characteristics of conventional and various swirl-type oxygen lances (Swirl angles are 58, 108, and 138, respectively) on the molten pool were studied. The mixing time, impacting depth and impacting diameter were measured by water model experiment. The flow field characteristics of gas-liquid two phase flow were simulated using Fluent software. It is found that 108 swirl-type oxygen lance injection can get the shortest mixing time which is only 47.6 s. The area surrounded by isovelocity is larger in molten pool when injecting by the swirl-type oxygen lance. When injecting by the 108 swirl-type oxygen lance, the area is the largest and the flow velocity of liquid steel is the highest. On this basis, the 108 swirl-type oxygen lance was experimented in 150 t vanadium extraction converter. The experiment shows that the swirl-type oxygen lance can guarantee the normal smelting process. Compared with the conventional oxygen lance, the reduction ratio of vanadium content in semi-steel is 17.8%, vanadium extraction rate is increased by 5.1%, V 2 O 5 grade of vanadium slag is increased by 0.93% and iron loss is reduced. It provides a new technology to improve the recovery of vanadium resources in converter.

show abstract

“…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%

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

et al. 2010

View full text Add to dashboard Cite

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 ...

show abstract

Effect of Nozzle Twisted Lance on Jet Behavior and Spitting Rate in Top Blown Process

Cited by 35 publications

References 5 publications

Temperature Corrected Turbulence Model for Supersonic Oxygen Jet at High Ambient Temperature

Temperature Corrected Turbulence Model for Supersonic Oxygen Jet at High Ambient Temperature

Simulation and Application of Swirl‐Type Oxygen Lance in Vanadium Extraction Converter

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

Contact Info

Product

Resources

About