Effect of blow parameters in the jet penetration by physical model of BOF converter

Maia, Breno Totti; Imagawa, Rafael Kajimoto; Petrucelli, Ana Clara; Tavares, Roberto Parreiras

doi:10.1016/j.jmrt.2014.06.010

Cited by 25 publications

(18 citation statements)

References 7 publications

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“…[7] The slag layer has strong influence at factor K from equation 6. Compared with other papers [2][3][4][5][6] , K factor change from units to thousandths. This reduction is function of slag resistance for jet penetration due high surface tension.…”

Section: Obtained Results By LI Et Almentioning

confidence: 99%

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Jet Penetration in Slag and Metal Into Bof Cold Model

Maia¹,

Diniz²,

Pereira³

et al. 2017

Anais Do Seminário De Aciaria, Fundição E Metalurgia De Não-Ferrosos

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In the present paper, a new energy balance equation was developed, considering the slag phase, in order to define the effects of jet penetration and determine a new value for the factor K. The factor K measure the resistance to momentum transference between exit nozzle and metallic bath. The experiments were performed based on the same conditions of the article used as a comparison. The results showed the same behavior between the experiments and it was possible to determine a new value for the factor K, which changed from the unit order for the metal phase system to hundredths order for the metal and slag phase systems. These results are considered unprecedented.

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Section: Obtained Results By LI Et Almentioning

confidence: 99%

“…Maia et al [4][5][6] considering multi nozzles that can be between 3 until 6, introduced equation 4. …”

Section: Equationmentioning

confidence: 99%

Jet Penetration in Slag and Metal Into Bof Cold Model

Maia¹,

Diniz²,

Pereira³

et al. 2017

Anais Do Seminário De Aciaria, Fundição E Metalurgia De Não-Ferrosos

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“…Masazumi [2] (LD-OB patent) for the first time shown consequence of different penetration indexes on the blowing behavior, like defined at table II. Formulas calculated in this comparison are published by Flinn et al [3] , Chatterjee [4] , Ishikawa and Segawa [5] , Masazumi [2] , Kai et al [6] , Koria & Lange [7] and Maia et al [8][9][10] , Szekely & Themelis [11] , Chukwulebe, Balajee et al [12] , Alam et al [13] , Meidani et al [14] . The figure 2 shows the results of various formulas compared to the formula of Kai et al [6] by Penetration Index %.…”

Section: Math Model and Industry Applicationmentioning

confidence: 99%

“…The K factor was constant equal 8 for fast application into industries. Cold model experiments [8][9][10] had variations at factor k, between 3 to 8, as function of number of nozzles, vertical nozzle angle, static slag layer and total bottom flow. Respecting constant values for each author, equations and converting values had adequate for appropriate units.…”

Section: Math Model and Industry Applicationmentioning

confidence: 99%

Comparison of the Various Cavity Depth or Jet Penetration Index Formulae for Blowing in a Bof With Bottom Stirring

Maia¹,

Tavares²,

Balajee³

et al. 2018

ABM Proceedings

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Several equations are developed over the years to calculate the penetration depth L of the Oxygen jet generated by the blowing lance for BOF/LD converters and similar processes. The penetration depth L for a given lance tip is primarily impacted by the lance height (gap), the oxygen flow rate and the resulting Oxygen jet momentum. Considering a dimensionless parameter L/Lo, where Lo is the liquid steel bath height, this paper will critically review both the theoretical and practical aspects of these depths of penetration equations, and recommend the most feasible equation(s) to determine the lance gap to use during the oxygen blow. This paper reviews how to translate the L/L0 in comparison with authors and yours considerations about nozzles parameters with respect to lance stirring, bottom stirring and slag layer patterns.

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“…Nessa equação, uma evolução em relação a outros estudos [5][6][7][8][9][10] , leva-se em conta a tensão superficial da camada de escória assim como do aço, pois tais valores influenciam diretamente na penetração do jato no banho, como demonstrado na equação 1. ), "" -Ângulo de inclinação do bocal e "n" -Número de furos no bico da lança.…”

Section: Cálculo Do Fator Kunclassified

Determinação Da Massa Movimentada Em Modelo a Frio Do Banho Metal Escoria Por Sopro Supersônico De Bicos Multifuros

Maia¹,

Diniz²,

Pereira³

et al. 2017

Anais Do Seminário De Aciaria, Fundição E Metalurgia De Não-Ferrosos

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ResumoA principal ferramenta de controle do processo BOF reside na regulagem dos parâmetros de sopro de oxigênio. As condições ótimas desse processo envolvem diversas variáveis, como vazão de oxigênio, distancia banho lança (DBL), número de furos para a saída de oxigênio na lança, entre outros fatores. Através de uma análise visual da penetração do jato e do volume movimentado, foram analisados os comportamentos para cada configuração de sopro entre diferentes combinações de bicos multifuros (3 a 6 furos), para uma distância banho lança (DBL) e vazão constantes. A análise dos parâmetros de interação entre o sopro e o banho líquido composta pelas frações de metal e escória, representados respectivamente por água e óleo de parafina é o principal objetivo deste trabalho. Foi necessário desenvolver nova metodologia para a determinação da penetração assim como proposta de nova fórmula e ajuste da constante empírica, fator K. As maiores penetrações foram alcançadas com os bicos de 3 e 4 furos. Para a configuração de 6 furos, foram encontrados os menores valores de penetração e maior volume de zonas de baixa movimentação em relação aos parâmetros estabelecidos. Palavras-chave: BOF; Modelo a frio; Penetração de jato; Zonas estagnadas; Fator K. MASS MOVEMENT DETERMINATION BY METAL SLAG BATH COLD MODEL BY SUPERSONIC BLOW FROM MULTI NOZZLES AbstractThe primary control tool of the BOF process lies on the adjustment of the oxygen blow parameters. The best process conditions involve several variables, like oxygen flow rate, distance bath lance (DBL), number of holes for the oxygen blow, among other factors. Through a visual inspection of the jet penetration and the volume of stagnant zones, the behavior of each configuration tested was analyzed using different sets of nozzles (3 to 6 holes), and with constant distance bath lance (DBL) and flow rate. The analysis of the interaction parameters between the oxygen blow, the molten metal and slag, represented respectively by water and paraffin oil, is the main objective of the present work. It was necessary to develop a new methodology in order to determine the penetration, propose a new formula and adjust the empirical constant, called K factor. The highest penetration were achieved for the nozzles with 3 and 4 holes. The lowest penetration and the highest volume of stagnant zones were represented for the configuration of 6 holes.

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Effect of blow parameters in the jet penetration by physical model of BOF converter

Cited by 25 publications

References 7 publications

Jet Penetration in Slag and Metal Into Bof Cold Model

Jet Penetration in Slag and Metal Into Bof Cold Model

Comparison of the Various Cavity Depth or Jet Penetration Index Formulae for Blowing in a Bof With Bottom Stirring

Determinação Da Massa Movimentada Em Modelo a Frio Do Banho Metal Escoria Por Sopro Supersônico De Bicos Multifuros

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