Optimization of Steel Flow in the Tundish by Modifying its Working Area

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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“…a) Diagram illustrating the course of the quality experiments . b) Location of the selected measurement points in the water model.…”

Section: Physical Modelingmentioning

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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“…Reviews summarizing the physical and mathematical modeling of continuous casting systems show the importance of numerical simulation in this research field . Further publications study different aspects concerning tundish or flow‐controlling designs and inclusion behavior …”

Section: Introductionmentioning

confidence: 99%

“…[25][26][27][28][29][30][31][32][33] Reviews summarizing the physical and mathematical modeling of continuous casting systems show the importance of numerical simulation in this research field. [34][35][36][37] Further publications study different aspects concerning tundish or flowcontrolling designs [25][26][27][29][30][31][32] and inclusion behavior. [27,28,32,33] This article investigates the active and reactive cleaning of NMI regarding an industrial prototypical two-strand tundish using computational fluid dynamics (CFD).…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of an Industrial‐Scale Prototypical Steel Melt Tundish Considering Flow Control and Cleaning Strategies

2019

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Herein, the increase in the cleanliness of steel melt is researched using an industrial‐scale prototypical tundish. State‐of‐the‐art alumina‐coated, carbon‐bonded ceramic foam hybrid filters are used, which combine different filtration strategies for the removal of nonmetallic inclusions (NMI) in steel melts. Reactive cleaning reduces a high amount of inclusions by means of flotation because of carbon monoxide bubbles. Their formation is based on a reaction between the dissolved carbon from the filter and the oxygen of the steel melt. The direct deposition of NMI at the filter surfaces is called active filtration. Numerical simulations are performed to compare the performance of flow‐controlling applications inside the tundish and different filter developments (shape and position) to increase the cleanliness of steel melt. The continuous steel melt, the dispersed NMI as well as the carbon monoxide bubbles are calculated with an Eulerian–Lagrangian approach focusing on the inclusion removal by active filtration and reactive cleaning.

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“…Research conducted by many authors [12][13][14][16][17][18][19][20][21] shows a very good compliance between simulations of the flow of liquid steel through the tundish, using turbulent flow models k-ε, and tests performed on water models and tests in industrial conditions. Most numerical calculations are conducted on the basis of the Reynolds-averaged Navier-Stokes equations (RANS) method, which allows the average rate of turbulent flow in the tundish to be determined.…”

mentioning

confidence: 98%

“…Ensuring a sufficient shell thickness is also related to the appropriate selection of the value of the mould wall taper, which is to compensate for the effect of steel shrinkage and to limit the occurrence of a gaseous gap. Many authors attempt to model effects occurring within the primary cooling zone using both commercial packages such as ANSYS Fluent ® , ProCAST ® and THERCAST ® [3][4][5][6][12][13][14][16][17][18][19][20], and their own original codes based on the FEM [1,2,11,[23][24][25][26]. Numerical modelling of the primary cooling zone also includes an issue related to computing the thermal stress, which combined with a correct fracture criterion may be used for determining the correct mould wall taper in correlation with the casting speed.…”

mentioning

confidence: 99%

Control and Design of the Steel Continuous Casting Process Based on Advanced Numerical Models

Miłkowska-Piszczek

Falkus

2018

Metals

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The process of continuous casting of steel is a complex technological task, including issues related to heat transfer, the steel solidification process, liquid metal flow and phase transitions in the solid state. This involves considerable difficulty in creating the optimal process control system, which would include the influence of all the physico‐chemical phenomena which may occur. In parallel, there is an intensive development of new mathematical models and an increase in computer performance, therefore complex numerical simulations requiring substantial computing time can be conducted. This paper presents a review of currently applied numerical methods allowing the phenomena accompanying the process of continuous casting of steel to be accurately represented. Special attention was paid to the selection of appropriate methods to solve the technological problem selected. The possibilities of applying selected numerical models were analysed in order to modify and improve the existing process or to design a new one linked to the implementation of new steel grades in the current production. The description of the method of defining the boundary conditions, initial conditions and material parameters as vital components ensuring that numerical calculations based upon them in the finite element method, which is that most frequently applied, are correct is an important element of the paper. The possibility of reliably defining the values of boundary parameters on the basis of information on the intensity of cooling in individual zones of the continuous casting machine was analysed.

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Optimization of Steel Flow in the Tundish by Modifying its Working Area

Cited by 11 publications

References 11 publications

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

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

Numerical Simulation of an Industrial‐Scale Prototypical Steel Melt Tundish Considering Flow Control and Cleaning Strategies

Control and Design of the Steel Continuous Casting Process Based on Advanced Numerical Models

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