Thermodynamics Analysis of Non-Metallic Inclusions Formation in the Liquid Steel Flow Through Continuous Casting Tundish

Jowsa, J.; Cwudziński, A.

doi:10.2478/v10172-012-0023-6

Cited by 5 publications

(6 citation statements)

References 3 publications

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“…The obtained pattern of NMI behavior indicates a possibility of liquid steel refining, also during continuous casting, especially when using refining powder and impact pad in the tundish. The recorded quantity of NMIs in liquid steel samples for tundish variants during introducing the alloy addition was similar to the results obtained in the casting sequences, during which no interference in the tundish powder was made . It is therefore concluded that the skilled introduction of the alloy addition to liquid steel via tundish powder will not have any adverse effect of increasing the NMI contents of the steel being cast.…”

Section: Resultssupporting

confidence: 80%

Numerical, Physical, and Industrial Studies of Liquid Steel Chemical Homogenization in One Strand Tundish with Subflux Turbulence Controller

Cwudziński

2014

steel research int.

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Chemical homogenization of liquid steel is one of the basic parameters defining quality of final products. The 95% chemical homogenization level is a required minimum that defines the effective dissolution of all the components introduced to the liquid steel. The object of investigation was a one-strand wedge-type tundish designed for casting slabs. For the set zone of alloy feeding, numerical simulations, laboratory experiments (with a isothermal physical water model) and industrial experiments were carried out. During the research project, a method for the hybrid introduction of an alloy addition to liquid steel has been developed, which combines the pulse and the step methods. From the performed computational fluid dynamics (CFD) computations, laboratory and industrial trials, fields of liquid steel flow, maps of water motion, behavior of non-metallic inclusions during industrial alloying process, mixing curves and time mixing characterize influence of using subflux turbulence controller (STC) on alloying process in the tundish have been obtained. In the tundishes with STC and a low dam, a reduction in mixing time was noted.

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Section: Resultssupporting

confidence: 80%

Numerical, Physical, and Industrial Studies of Liquid Steel Chemical Homogenization in One Strand Tundish with Subflux Turbulence Controller

Cwudziński

2014

steel research int.

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“…It is only possible to limit supercritical and dimensionally critical NMIs occurring in steel, which adversely affect CSC and plastic working processes and, as a consequence, the functional properties of the finished products. This explains the special interest in NMIs and research undertaken in many research centers on the possibility of removing NMIs during steel production …”

Section: Introductionmentioning

confidence: 99%

“…This explains the special interest in NMIs and research undertaken in many research centers on the possibility of removing NMIs during steel production. [1][2][3][4] Modeling studies, both physical and numerical (Computational Fluid Dynamics-CFD) are research methods that are commonly used for the investigation of the problems of removing NMIs from liquid steel. Both methods support and complement each other; therefore, they are often combined in a single research program.…”

Section: Introductionmentioning

confidence: 99%

Modeling Research Technique of Nonmetallic Inclusions Distribution in Liquid Steel during Its Flow through the Tundish Water Model

Merder

Warzecha

et al. 2019

steel research int.

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This study shows research results of behaviors of nonmetallic inclusions (NMIs) in a tundish represented by water model. The object under investigation is a two‐strand trough‐type continuous casting tundish operating in one of the Polish steel plants. Hollow glass microspheres with diameters ranging from 10 to 140 μm are used for testing, which represents the NMIs. The distribution process of microspheres is investigated; the qualitative analysis (visualization) and quantitative analysis (using a laser particle counter) of microsphere distribution (movement) are performed. Based on the obtained results, it is found that the analyzed tundish is not of optimal design, in terms of removing small NMIs, as they are conducted in a stream of liquid flowing at the bottom of the tundish, moving directly into nozzles of the tundish. Their movement is caused by the shaped liquid‐flow phenomena in the tundish working space. The test results help to validate a numerical model, which can be used in further studies to redesign the working space of the tundish. The positive result of verification facilitates to obtain a tool for implementing flow optimization in terms of receiving high metallurgical purity of slabs.

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“…FactSage, a software program relying on the Gibbs free energy minimization method, was employed for calculations. The general form of the equation for the system's components (elements, stoichiometric compounds) takes on the form of the following expression [18]:…”

Section: Methodsmentioning

confidence: 99%

Thermodynamic Calculation of the Behaviour of Coke at High Temperatures

Konstanciak

2014

Acta Metall. Slovaca Conf.

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The main purpose of this paper was to analyze the behavior of coke in the blast furnace. The analysis of changes in chemical composition of coke due to impact of inert gas and air at different temperatures was made. By applying the FactSage three groups of substances can be distinguished. The chemical composition of blast furnace coke and the results of calculations of changes of chemical composition of coke heat treated under certain conditions were compared. The structural studies of these materials were presented. The results of the analysis of ash produced from one of Polish cokes was taken for consideration. This is not the average composition of Polish coke ashes, nevertheless it is representative of most commonly occurring chemical compositions.Keywords: coke, ash in coke, thermochemical calculations 1 Introduction Coke contains approx. 1% of volatile substances and approx. 10% of mineral substances. So, it is legitimate to claim that the liberation of these volatile substances and a slight evaporation of the mineral compounds will occur under the blast-furnace conditions [1 -10]. As a fuel and an iron oxide reducer, coke performs also the function of a framework supporting the charge. However, in the lower part of the blast furnace shaft, the mechanical properties of the coke worsen. The change of these properties is affected by factors, such as [11][12][13][14][15][16]: 1) gasification reactions; 2) thermal factors; 3) blast-furnace blast. These factors contribute to the formation of coke dust that densifies the primary slag thus making its flowing down difficult and also reducing the charge permeability. The thermal interactions reduce the strength of the coke due to the change in internal stresses in the structure. This is also associated with the presence of mineralogical and organic inclusions in coals subjected to coking. The thermal conductivity of the coke increases as its volatile matter contents decreases. As the volatile substances are released from the coke, a loss and a shrinkage of the solid part result, which leads to a reduction in strength [17].

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Thermodynamics Analysis of Non-Metallic Inclusions Formation in the Liquid Steel Flow Through Continuous Casting Tundish

Cited by 5 publications

References 3 publications

Numerical, Physical, and Industrial Studies of Liquid Steel Chemical Homogenization in One Strand Tundish with Subflux Turbulence Controller

Numerical, Physical, and Industrial Studies of Liquid Steel Chemical Homogenization in One Strand Tundish with Subflux Turbulence Controller

Modeling Research Technique of Nonmetallic Inclusions Distribution in Liquid Steel during Its Flow through the Tundish Water Model

Thermodynamic Calculation of the Behaviour of Coke at High Temperatures

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