Effect of Elliptical Snorkel on the Decarburization Rate in Single Snorkel Refining Furnace

2012 ◽  
Vol 84 (2) ◽  
pp. 192-197 ◽  
Author(s):  
Qixuan Rui ◽  
Fang Jiang ◽  
Zhuang Ma ◽  
Zhimin You ◽  
Guoguang Cheng ◽  
...  
Keyword(s):  
Decarburization Rate

Computational Fluid Dynamics Study of New Vacuum Degassing Process

2009 ◽  
Vol 4 (3) ◽  
Author(s):  
Manas Kumar Mondal ◽  
Govind Sharan Gupta ◽  
Shin-ya Kitamura ◽  
Nobuhiro Maruoka
Keyword(s):  
Fluid Flow ◽  
Gas Flow ◽  
Low Carbon Steel ◽  
Momentum Balance ◽  
Low Carbon ◽  
Decarburization Rate ◽  
Vacuum Degassing ◽  
Liquid Phases ◽  
New Process ◽  
Flow Phenomena

Recently, the demand of the steel having superior chemical and physical properties has increased for which the content of carbon must be in ultra low range. There are many processes which can produce low carbon steel such as tank degasser and RH (Rheinstahl-Heraeus) processes. It has been claimed that using a new process, called REDA (Revolutionary Degassing Activator), one can achieve the carbon content below 10ppm in less time. REDA process, in terms of installment cost, is in between the tank degasser and RH processes. As such, REDA process has not been studied thoroughly. Fluid flow phenomena affect the decarburization rate the most besides the chemical reaction rate. Therefore, momentum balance equations along with k-? turbulent model have been solved for gas and liquid phases in two-dimension (2D) for REDA process. The fluid flow phenomena have been studied in details for this process by varying gas flow rate, depth of immersed snorkel in the steel, diameter of the snorkel and change in vacuum pressure. It is found that the design of the snorkel affects the melt circulation of the bath significantly.

scholarly journals Fluid Flow in Ladle and Its Effect on Decarburization Rate in RH Degasser.

1993 ◽  
Vol 33 (10) ◽  
pp. 1088-1094 ◽  
Author(s):  
Yoshiei Kato ◽  
Hakaru Nakato ◽  
Tetsuya Fujii ◽  
Shigeru Ohmiya ◽  
Seiji Takatori
Keyword(s):  
Fluid Flow ◽  
Decarburization Rate

Influence of Electrode Argon-Hydrogen Co-Injection on Carbon Content in a Alternating Current Ladle Furnace

2011 ◽  
Vol 239-242 ◽  
pp. 2361-2364
Author(s):  
Dong Ping Zhan ◽  
Hui Shu Zhang ◽  
Zhou Hua Jiang ◽  
Wei Gong ◽  
Zhao Ping Chen
Keyword(s):  
Reaction Rate ◽  
Local Equilibrium ◽  
Low Carbon Steel ◽  
Alternating Current ◽  
Gas Mixtures ◽  
Electric Arc ◽  
Hydrogen Gas ◽  
Ladle Furnace ◽  
Low Carbon ◽  
Decarburization Rate

About 80 kg low carbon steel was refined in a multifunction ladle furnace (AC-LF) with alternating current supplying. The argon-hydrogen gas mixtures were injected into the electric arc zone through one hollow graphite electrode. The flow rate of the gas mixtures was 3 m3/h. Results of the tests and the calculation based on the plasma local equilibrium thermodynamics and metallurgical thermodynamics theories show that, when the argon-hydrogen gas mixtures are injected into the electric arc zone, the carburetion rate is 4.7×10-6per minute for the steel heated by conventional AC-LF, which is 1.26 and 1.51 times of the heats blown 90%Ar-10%H2and 80%Ar-20%H2, respectively. The carburetion rate is reduced by 20% at least when argon-hydrogen gas mixtures are blown into the furnace. When H2content in the gas mixtures reached 20% from 0, the decarburization rate increased but the total reaction rate decreases by 1.59×10-6per minute.

Numerical Analysis of Multiphase Flow in a Steel Oxygen Converter With Top and Bottom Blowing

2007 ◽  
Author(s):  
Dulce Y. Medina ◽  
Miguel A. Barron ◽  
Isaias Hilerio
Keyword(s):  
Multiphase Flow ◽  
Oxygen Converter ◽  
Metal Bath ◽  
Decarburization Rate ◽  
Basic Oxygen ◽  
Basic Oxygen Converter ◽  
Removal Of Impurities ◽  
Bottom Blowing ◽  
Bottom Injection ◽  
Jet Velocities

Combined blowing in the steelmaking basic oxygen converter is a technique that allows more agitation in the metal bath, and gives a fast decarburization rate, accelerated removal of impurities and chemical and thermal homogenization. In this work the multiphase flow in an industrial-like basic oxygen converter with top and bottom blowing is analyzed by means of Computational Fluid Dynamics software. Turbulence in the converter is simulated by means of the classical K-ε model given that this model yields more numerical stability during the integration for long times. Top jet velocities of Mach 1 and Mach 2, and 50 and 100 m s−1 of bottom injection velocities are used, and the results are compared with the conventional top blowing injection. Numerical results show that the combined blowing generates more agitation of the metal bath than that of the top blowing, however, from an operating viewpoint, combined blowing promotes that a significant volume of molten metal be expelled from the converter mouth.

scholarly journals 3D Integrated Modeling of Supersonic Coherent Jet Penetration and Decarburization in EAF Refining Process

Processes ◽  
2020 ◽  
Vol 8 (6) ◽  
pp. 700
Author(s):  
Yuchao Chen ◽  
Armin K. Silaen ◽  
Chenn Q. Zhou
Keyword(s):  
Liquid Steel ◽  
Flow Characteristics ◽  
Bath Temperature ◽  
Integrated Model ◽  
Refining Process ◽  
Computational Time ◽  
Reacting Flow ◽  
Two Phase ◽  
Decarburization Rate ◽  
Coherent Jet

The present study proposes a complete 3D integrated model to simulate the top-blown supersonic coherent jet decarburization in the electric arc furnace (EAF) refining process. The 3D integrated model avoids the direct simulation of the supersonic coherent jet interacting with the liquid steel bath and provides a feasible way to simulate the decarburization in the liquid steel-oxygen two-phase reacting flow system with acceptable computational time. The model can be used to dynamically predict the details of the molten bath, including 3D distribution of in-bath substances, flow characteristics and bath temperature and provide a basis for optimizing the decarburization rate or other required parameters during the refining process.

scholarly journals Decarburization Rate of 21/4Cr-1Mo Steel in High Temperature Sodium

1993 ◽  
Vol 42 (2) ◽  
pp. 79-85
Author(s):  
Norichika Aoki ◽  
Eiichi Yoshida
Keyword(s):  
High Temperature ◽  
Decarburization Rate

scholarly journals Fluid Flow in Ladle and Its Effect on Decarburization Rate in RH Degasser

1991 ◽  
Vol 77 (10) ◽  
pp. 1664-1671 ◽  
Author(s):  
Yoshiei KATO ◽  
Hakaru NAKATO ◽  
Tetsuya FUJII ◽  
Shigeru OHMIYA ◽  
Seiji TAKATORI
Keyword(s):  
Fluid Flow ◽  
Decarburization Rate

scholarly journals An Improved Dynamic Model of the Vanadium Extraction Process in Steelmaking Converters

2019 ◽  
Vol 10 (1) ◽  
pp. 111
Author(s):  
Shike Chen ◽  
Zhijie Cai
Keyword(s):  
Molten Steel ◽  
Production Control ◽  
Extraction Process ◽  
Decarburization Rate ◽  
Industrial Countries ◽  
Strategic Resources ◽  
Vanadium Extraction ◽  
Model Equations ◽  
Improved Model ◽  
The Masses

The production process from iron ore to steel can be divided into several stages, among which the processes of vanadium extraction and steelmaking are two key technological sections. The products of vanadium extraction are important strategic resources for modern industrial countries, and the remaining molten iron after vanadium extraction provides the material used in the subsequent steelmaking processes. In some mechanism models of vanadium extraction and the steelmaking process, the contact area of the reactions is considered to be constant in the empirical formula; furthermore, even the masses of the molten steel and slag are taken to be constants. This paper presents an important improvement to the existing models, in which the contact areas of the slag–metal interface and the emulsion system are considered to be non-constant. The improved model is simple and easy to analyze theoretically. Theoretical analysis of the model equations can be used to explain the competitive oxidation between each element, as well as the oxygen conservation of the system. The numerical simulations are consistent with existing production data, showing that the mass fraction of vanadium can be reduced to the specified threshold after about 3.5 min of blowing, which provides an important reference for production control. Furthermore, it is shown that the model captures the “trapezoid” structure of the decarburization rate. This paper also considers the relationship between FeO and O, the numerical simulation partly reflecting the dependence between the concentrations of FeO and O. The improved model can be used to describe and predict the change of the molten steel and slag composition in the process of vanadium extraction, which provides a mathematical foundation for the automatic control of the vanadium extraction process.

The Influence of Critical Turning Point of Argon Flowrate Ascension on Decarburization Rate of RH Treatment for Ultra-Low Carbon Steel

2011 ◽  
Vol 284-286 ◽  
pp. 1025-1030
Author(s):  
Chong Wei Li ◽  
Guo Guang Cheng ◽  
Ai Min Cui
Keyword(s):  
Initial Conditions ◽  
Low Carbon Steel ◽  
Bubble Surface ◽  
Droplet Surface ◽  
Gas Bubble ◽  
Low Carbon ◽  
Decarburization Rate ◽  
Argon Gas ◽  
Iron And Steel ◽  
Ultra Low Carbon Steel

Through the mathematical model of RH vacuum decarburization, the decarburization mechanism of argon gas bubble surface was studied. By the RH equipment of Shougang Qian’an Iron and Steel Co. Ltd for background, the calculated results of this model showed that the decarburization quantity of argon gas bubble surface was about 8% that of overall decarburization. In the initial conditions was constant, the ascension of argon flowrate will promote the decarburization quantity of argon gas bubble surface, free surface and splash droplet surface as well as reducing the decarburization quantity of internal liquid steel decarburization. Based on the commercial production data, it was found the best opportunity of ascension blow argon flowrate to acquire lower carbon content in relatively shorter time.

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