scholarly journals Design on Optimization of Argon Bottom Blowing of Molten Steel ladle

2011 ◽  
Vol 16 ◽  
pp. 284-290 ◽  
Author(s):  
Jiandong Shen ◽  
Yong Zhao ◽  
Guijin Han
Keyword(s):  
Molten Steel ◽  
Steel Ladle ◽  
Bottom Blowing

Research of Flow Simulation with High-Pressure and Bottom-Blowing Nitrogen

2013 ◽  
Vol 634-638 ◽  
pp. 3110-3113
Author(s):  
Shu Huan Wang ◽  
He Jun Zhang ◽  
Ding Guo Zhao
Keyword(s):  
High Pressure ◽  
Flow Field ◽  
Molten Steel ◽  
Gas Content ◽  
High Nitrogen Steel ◽  
High Nitrogen ◽  
Nitrogen Steel ◽  
Bottom Blowing ◽  
Steel Flow ◽  
Pressure Factor

According to the actual situation of refining high nitrogen steel with the laboratory high pressure reaction axe, the molten steel flow field in the high-pressure and bottom-blowing nitrogen reactor was simulated by using the software Fluent. The rules of the influence of pressure factor on the molten steel flow field characteristics, turbulent kinetic energy and gas content were explored. According to the characteristics of the flow field and gas-liquid two phase structure, the rules of the influence of pressure factor on nitrogen concentration distribution were analyzed. So some useful theoretical basis and guidance were provided for laboratory refining high nitrogen steel and industrial production in the future.

Bottom-Blown Stirring Technology Application in Consteel EAF

2011 ◽  
Vol 361-363 ◽  
pp. 639-643 ◽  
Author(s):  
Kai Dong ◽  
Rong Zhu ◽  
Wen Juan Liu
Keyword(s):  
Molten Steel ◽  
Basic Principle ◽  
Liquid Steel ◽  
Mixing Time ◽  
Technology Application ◽  
Heat Time ◽  
Final Slag ◽  
Stirring Effect ◽  
Lime Consumption ◽  
Bottom Blowing

Bottom blown stirring technology application in EAF was studied in this paper. The basic principle of bottom blowing process was researched, the bottom blown stirring can give strong stirring effect on the molten steel bath, thus bath mixing time was shortened, decarburization and dephosphorization were improved, however over stirring would lead to liquid steel incontact with atmosphere air. Reasonable process was considered on Consteel EAF. results show that: with bottom-blown stirring technology, decarburization and dephosphorization increase significantly; oxygen and lime consumption decrease; content of FeO in final slag reduces; and heat time becomes short.

Mathematical Modeling of Transient Flow and Heat Transfer in Gas Stirred Molten Steel

2001 ◽  
Author(s):  
J. L. Xia ◽  
T. Ahokainen
Keyword(s):  
Heat Transfer ◽  
Molten Steel ◽  
Thermal Stratification ◽  
Transient Flow ◽  
Liquid Interface ◽  
Turbulent Dispersion ◽  
Steel Ladle ◽  
Bubble Liquid ◽  
Flow And Heat Transfer ◽  
Heat Transfer Correlations

Abstract Transient two phase flow and heat transfer in a gas-stirred steel ladle are numerically investigated. An Eulerian two fluid approach is used. The drag, lift and turbulent dispersion forces are taken into account for the interface interactions. Different interface heat transfer correlations such as Ranz-Marshall and Hughmark relations are used to examine the influence of heat transfer between gas-liquid interface on the flow. The flow pattern, the histories of both gas and molten steel temperatures, and the thermal stratification history are presented. Results show that gas injection can homogenize thermal field and result in a thermal stratification of about 2 °C only (not complete homogenization). The different heat transfer correlations examined for the bubble-liquid interface have negligible impact on the flow and thermal fields. Predictions are compared with experimental data measured in an industrial ladle and a reasonable agreement is achieved.

scholarly journals Physical Simulation of Molten Steel Homogenization and Slag Entrapment in Argon Blown Ladle

Processes ◽  
2019 ◽  
Vol 7 (8) ◽  
pp. 479 ◽  
Author(s):  
Yang ◽  
Jin ◽  
Zhu ◽  
Dong ◽  
Lin ◽  
...  
Keyword(s):  
Flow Rate ◽  
Molten Steel ◽  
Physical Simulation ◽  
Mixing Time ◽  
Water Model ◽  
Steel Ladle ◽  
Argon Flow Rate ◽  
Argon Flow ◽  
Slag Thickness ◽  
Slag Entrapment

Argon stirring is one of the most widely used metallurgical methods in the secondary refining process as it is economical and easy, and also an important refining method in clean steel production. Aiming at the issue of poor homogeneity of composition and temperature of a bottom argon blowing ladle molten steel in a Chinese steel mill, a 1:5 water model for 110 t ladle was established, and the mixing time and interface slag entrainment under the different conditions of injection modes, flow rates and top slag thicknesses were investigated. The flow dynamics of argon plume in steel ladle was also discussed. The results show that, as the bottom blowing argon flow rate increases, the mixing time of ladle decreases; the depth of slag entrapment increases with the argon flow rate and slag thickness; the area of slag eyes decreases with the decrease of the argon flow rate and increase of slag thickness. The optimum argon flow rate is between 36–42 m3/h, and the double porous plugs injection mode should be adopted at this time.

Study on Amplitude of the Surface of Liquid Steel in Bottom-Blowing Ladle with Immersed Tube

2013 ◽  
Vol 734-737 ◽  
pp. 1511-1515
Author(s):  
De Hui Zhang ◽  
Ming Gang Shen ◽  
Qing Hua Qi ◽  
Jin Wei Kuang
Keyword(s):  
Flow Rate ◽  
Molten Steel ◽  
Liquid Steel ◽  
Similarity Theory ◽  
Steel Slag ◽  
Water Model ◽  
Argon Flow Rate ◽  
Steel Making ◽  
Argon Flow ◽  
Bottom Blowing

In the process of bottom argon blowing large argon flow rate can cause vigorous fluctuations on the surface of the molten steel and splash and reoxidize the molten steel, making the slag rolled into the steel slag, also causing the erosion of the ladle lining refractories. A 1:7 ratio ladle water model system of 150 ton ladle was established from the similarity theory in the lab. Study and analyze the effects of the inserting depth and diameter of immersed tube and bottom blowing flow rate on the fluctuation of the surface of liquid steel. Results show that the fluctuations on the surface of steel can be limited effectively by changing the diameter and inserted depth of immersed tube when selecting a larger flow rate of bottom blowing, which improve the mixing effect of liquid steel.

The Smith Predictor Control of Argon-Bottom-Blowing Supply System with Time-Delay

2014 ◽  
Vol 602-605 ◽  
pp. 1383-1386
Author(s):  
Li Hui Chen ◽  
Zhan Ping Huang ◽  
Wen Xia Du ◽  
Yan Rui Du
Keyword(s):  
Time Delay ◽  
Molten Steel ◽  
Pid Controller ◽  
Supply System ◽  
Smith Predictor ◽  
Control Effect ◽  
Bottom Blowing ◽  
Simulation Results ◽  
System With Time Delay

The process of Argon-bottom-blowing is widely used in steelmaking, Argon is used to stir molten steel fully and uniform the composition and temperature to improve the quality of molten steel. In this paper, Argon-bottom-blowing supply system is selected as the research object, there exits big delay because of the long gas pipeline. In order to overcome the adverse effect of time-delay, the reasonable Smith predictor is designed, which try to make PID regulator act in advance and reduce system overshoot amount. The simulation results show Smith predictor and PID controller are connected in parallel, the influence of time-delay can be eliminated and satisfactory control effect can be obtained.

scholarly journals Numerical simulation and industrial practice of inclusion removal from molten steel by gas bottom-blowing in continuous casting tundish

2011 ◽  
Vol 47 (2) ◽  
pp. 137-147 ◽  
Author(s):  
Z. Meijie ◽  
G. Huazhi ◽  
H. Ao ◽  
Z. Hongxi ◽  
D. Chengji
Keyword(s):  
Numerical Simulation ◽  
Residence Time ◽  
Molten Steel ◽  
Volume Fraction ◽  
Dead Volume ◽  
Inclusion Removal ◽  
Industrial Practice ◽  
Bottom Blowing ◽  
Metallographic Images ◽  
Gas Blowing

Gas blowing at the bottom of tundish is an efficient metallurgy technique in clean steelmaking. In this paper, the removal of small size inclusions in the gas bottom-blowing tundish was studied by numerical simulation and industrial practice. The residence time distribution (RTD) of molten steel in the tundish was calculated by mathematical modeling. The content of small size inclusions in the slab was analyzed using a oxygen probing and metallographic images. The results show that the molten steel characteristics obviously change when applied gas bottom-blowing, the average residence time of molten steel in the tundish prolongs more than 100s and the dead volume fraction decreases about 5%. Therefore, the removal efficiency of small size inclusions greatly increases because of bubbles attachment and long moving path. Industrial experiment results show that the average inclusions content of less than 20?m decreases more than 24%, the average overall oxygen content decreases about 15% when controlling the reasonable blowing parameters.

scholarly journals Physical Experiment and Numerical Simulation on Thermal Effect of Aerogel Material for Steel Ladle Insulation Layer

Coatings ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1205
Author(s):  
Liguang Zhu ◽  
Limin Zhang ◽  
Caijun Zhang ◽  
Zhiqiang Wang ◽  
Pengcheng Xiao ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Molten Steel ◽  
Wall Temperature ◽  
Calculation Method ◽  
Heat Emission ◽  
Steel Ladle ◽  
Relevant Parameter ◽  
Insulation Material ◽  
Insulation Layer ◽  
Temperature Loss

The selection of lining material for a steel ladle is important to heat preservation of molten steel. Aerogel insulation materials have very low thermal conductivity, however, they are rarely used in steel ladles. In this paper, the application of a new silica aerogel material on the steel ladle insulation layer is tested, and a new calculation method is designed to study its insulation effect. In other words, the ladle wall temperature is obtained by finite element model (FEM) and experiments, then the heat emission from the ladle wall is calculated by the Boltzmann mathematical model according to the ladle wall temperature, and the temperature loss of molten steel is calculated inversely according to the heat emission of ladle wall. Compared with the original steel ladle (comparison ladle), the application effect is analyzed. Due to the stable heat storage of the ladle wall after refining, the validity of the models are verified in ladle furnace (LF) process. The results show that the new calculation method is feasible, and the relevant parameter settings in the FEM and Boltzmann mathematical model are correct. Finally, after using the new aerogel insulation material, the temperature of molten steel is reduced by 16.67 °C, and the production cost is reduced by CNY 5.15/ton of steel.

Study on Mixing Time in Bottom-Blowing Ladle with Immersed Tube

2013 ◽  
Vol 750-752 ◽  
pp. 400-403
Author(s):  
Qing Hua Qi ◽  
Ming Gang Shen ◽  
De Hui Zhang ◽  
Tao Wu
Keyword(s):  
Flow Rate ◽  
Molten Steel ◽  
Steel Surface ◽  
Mixing Time ◽  
Water Model ◽  
Refractory Materials ◽  
Steel Making ◽  
Large Flow Rate ◽  
Bottom Blowing ◽  
Large Flow

As large flow rate of argon blowing in the process of bottom argon blowing ladle will cause severe fluctuations and sprays of molten steel, making the slags surface boiled and steel secondly oxidized, melting the refractory materials in the ladle, the flow rate of bottom argon blowing is limited, which will affect the efficiency of stirring. A 1:7 ratio ladle water model is established in the lab, and we will discuss how the diameter (d) of immersed tube, inserting depth (h) and the rate of bottom argon blowing affect the mixing time. The results show that the fluctuations on the steel surface can be diminished by the variations of diameters of immersed tube and inserting depth, the mixing time can be shorted by the increased flow rate of bottom argon blowing.

scholarly journals A Novel Multiphase Methodology Simulating Three Phase Flows in a Steel Ladle

Processes ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 175 ◽  
Author(s):  
Marco Ramírez-Argáez ◽  
Abhishek Dutta ◽  
A. Amaro-Villeda ◽  
C. González-Rivera ◽  
A. Conejo
Keyword(s):  
Gas Phase ◽  
Molten Steel ◽  
Physical Nature ◽  
Navier Stokes ◽  
Multiphase System ◽  
Steel Ladle ◽  
System A ◽  
Liquid Phases ◽  
Three Phase ◽  
Turbulent Flow Structure

Mixing phenomena in metallurgical steel ladles by bottom gas injection involves three phases namely, liquid molten steel, liquid slag and gaseous argon. In order to numerically solve this three-phase fluid flow system, a new approach is proposed which considers the physical nature of the gas being a dispersed phase in the liquid, while the two liquids namely, molten steel and slag are continuous phases initially separated by a sharp interface. The model was developed with the combination of two algorithms namely, IPSA (inter phase slip algorithm) where the gas bubbles are given a Eulerian approach since are considered as an interpenetrating phase in the two liquids and VOF (volume of fluid) in which the liquid is divided into two separate liquids but depending on the physical properties of each liquid they are assigned a mass fraction of each liquid. This implies that both the liquid phases (steel and slag) and the gas phase (argon) were solved for the mass balance. The Navier–Stokes conservation equations and the gas-phase turbulence in the liquid phases were solved in combination with the standard k-ε turbulence model. The mathematical model was successfully validated against flow patterns obtained experimentally using particle image velocimetry (PIV) and by the calculation of the area of the slag eye formed in a 1/17th water–oil physical model. The model was applied to an industrial ladle to describe in detail the turbulent flow structure of the multiphase system.

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