Clean Steel Block - New developments towards clean steel

Lange, Miriam Magdalena; Claes, J.; Joly, Alan G.

doi:10.1051/metal:2003102

Cited by 2 publications

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“…They also have found that gas injection on the bottom of the ladle decreases H C . The same was observed by other authors [10] after injection of gas at the four corners of the well block during the ladle draining. In a previous study [6] H C has reduced by introducing physical obstacles to postpone drain sink formation.…”

Section: Introductionsupporting

confidence: 88%

Numerical and Physical Simulation of Steel Ladle Draining Operation With Different Well Block Design

Conceição¹,

Silva²,

Silva³

et al. 2019

TMM

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At the end of a ladle draining operation a structure called drain sink forms at the top surface of the liquid steel allowing slag carry over from the ladle to the tundish and causing metallic losses. On this study, the effect of different well block configuration on the critical height for drain sink formation (H C) was investigated using numerical and physical modeling. The modified well block configuration showed lower H C in most of the cases when compared with the standard design. It could represent almost 50% of metallic lost savings during the continuous casting process. Air injection was also investigated and increased significantly the H C value. The numerical model showed good agreement with the physical model and was used to help undertanding this behavior.

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Section: Introductionsupporting

confidence: 88%

Numerical and Physical Simulation of Steel Ladle Draining Operation With Different Well Block Design

Conceição¹,

Silva²,

Silva³

et al. 2019

TMM

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Modelagem Física Da Formação De Vórtice Durante O Vazamento Do Aço De Uma Panela

Santos¹,

Furtado

Silva

et al. 2008

TMM

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ResumoUm modelo em acrílico de uma panela (315 toneladas, ArcelorMittal Tubarão), escala 1:7, foi utilizado para simular as condições de vazamento do aço, e avaliar as condições de surgimento do vórtice. O momento da inserção do vórtice no canal de vazamento foi determinado através de sensores foto-elétricos e o material residual foi pesado de modo a se avaliar o rendimento metálico. A influência do tipo de fluxo residual imposto pelas rotas normais de processamento, tais como RH e IRUT, da vazão de drenagem, além de dispositivos antivórtice foi avaliada. O fluxo residual devido ao processamento em RH e IRUT, bem como o nível inicial de aço na panela não afetaram os resultados. O Volume Residual se mostrou função apenas da vazão. Verificou-se que o fluxo de aço era interrompido pela capacidade de abastecimento radial do canal de saída. Como tal, a utilização de quebradores de vórtice se mostrou contra producente. Simulações realizadas induzindo um fluxo rotacional no fluido de forma a aumentar a propensão ao vórtice permitiram confirmar que a injeção de gás pelo fundo da panela e a utilização de barreiras próximas à região de vazamento contribuem para aumentar o rendimento. Palavras-chave: Lingotamento contínuo; Vórtice; Panelas; Simulação física. PHYSICAL MODELING OF VORTEX FORMATION DURING LADLE DRAINAGE AbstractA 1:7 scale plexiglas model of a steelmaking ladle (315 tons, ArcelorMittalTubarão) was built in order to assess the conditions of vortex formation during the final stages of draining. The vortex was detected by a photo-electric sensor and the mass of residual liquid inside the ladle was evaluated after weighing. The influence of the type of residual flow, as dictated by routes of processing such as: RH degasser, IRUT reactor, as well as the drainage flow rate, in addition to anti-vortex devices, was assessed Residual flow due to RH or IRUT processing as well as the initial level of liquid did not affect the results. The mass of residual liquid at vortex onset was influenced by the flow rate only. At the final stages of drainage, the liquid surface collapse was dictated by the bottom ladle capacity of supplying liquid in the radial direction to the outlet. As a consequence vortex breakers were found deleterious under these set of conditions. A rotational flow was induced in order to increase the likelyhood of vortex formation. In this case gas injection through the pouring nozzle, vortex breakers, slopped bottoms have been found effective. Key words: Continuous casting; Ladle; Simulation; Vortex. INTRODUÇÃOA Indústria Siderúrgica vem focando o seu desenvolvimento na melhoria da qualidade dos materiais produzidos de forma a atender a restrições mais rígidas. No entanto o custo de fabricação é fator que não pode ser desprezado e, neste contexto, a Aciaria torna-se de grande valor potencial de estudo, uma vez que, além de agregar cerca de 30% ao custo do produto acabado, ainda pode ser responsável por diversos defeitos observados junto ao cliente final.

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Clean Steel Block - New developments towards clean steel

Cited by 2 publications

References 0 publications

Numerical and Physical Simulation of Steel Ladle Draining Operation With Different Well Block Design

Numerical and Physical Simulation of Steel Ladle Draining Operation With Different Well Block Design

Modelagem Física Da Formação De Vórtice Durante O Vazamento Do Aço De Uma Panela

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