AN EVALUATION OF GAS INJECTION EFFECTS IN A MECHANICALLY STIRRED HOT METAL DESULFURIZATION SYSTEM
UMA AVALIAÇÃO DOS EFEITOS DA INJEÇÃO DE GÁS EM UM SISTEMA MECANICAMENTE AGITADO DE DESSULFURAÇÃO DE FERRO GUSA
Torres, Filipe de Menezes; Silva, Carlos Antonio da; Silva, Itavahn Alves da; Melo, Pedro Henrique Resende Vaz de; Lourenço, Marcelo Araújo
Abstract
Physical modeling techniques have been used in order to assess the effects of gas injection as a means of optimizing mechanically stirred desulfurization processes. For such a 1:7 scale model of a 315 ton of a Kanbara reactor was built. The influence of gas injection on mixing times, gas – liquid interfacial kinetics and solid phase dispersion was evaluated. Gas injection can reduce mixing times up to 20% and can increase solid dispersion up to 40%. Gas liquid interaction is shown to be highly dependent on the gas injection location. In this regard injecting through the impeller or at the bottom of the ladle has been investigated. Gas injection can be beneficial to the desulfurization process.
Keywords
Resumo
Técnicas de simulação física foram utilizadas para analisar os efeitos da injeção de gás como modo de otimização de processos de dessulfuração mecanicamente agitados. Um modelo em escala 1/7, correspondente a um reator de 315ton de capacidade, foi desenvolvido. O estudo foi realizado por meio da análise do tempo de mistura, cinética de interação interfacial e qualidade da dispersão de escória. Resultados satisfatórios foram observados, como uma redução de até 20% do tempo de mistura e um aumento de 40% na dispersão de escória para o fundo da panela. A interação gás – líquido é altamente dependente do local de injeção de gás. A técnica possui grande potencial de otimização do processo.
Palavras-chave
Referências
1 Schrama F, Berg B. Comparison of Kanbara reactor, magnesium mono-injection and lime: magnesium co-injection for hot metal desulphurization. Millennium Steel India. 2014;4(1):26-31.
2 Kikuchi N, Nabeshima S, Kishimoto Y. Effect of propane gas on hot metal desulfurization by CaO based flux. ISIJ International. 2012;52(10):1809-1816. http://dx.doi.org/10.2355/isijinternational.52.1809.
3 Liu Y, Zhang Z, Liu J, Zhang J, Masamichi S, Zhang J. Cold model study on Mg desulfurization of hot metal under mechanical stirring. Journal of Iron and Steel Research. 2013;20(12):1-6. http://dx.doi.org/10.1016/S1006-706X(13)60208-3.
4 Gómez ER, Zenit R, Rivera CG, Trápaga G, Ramírez-Argáez MA. Physical modeling of fluid flow in ladles of aluminum equipped with impeller and gas purging for degassing. Metallurgical and Materials Transactions. B, Process Metallurgy and Materials Processing Science. 2013;44B(4):974-983. http://dx.doi.org/10.1007/s11663-013-9845-5.
5 Bird RB, Stewart WE, Lightfoot EN. Transport phenomena. 2nd ed. New York: John Wiley & Sons; 2002.
6 Iguchi M, Ilegbusi OJ. Modelling multiphase materials processes: gas-liquid systems. New York: Springer; 2011.
7 Komarov SV, Itoh K, Sano M, Blinov KA. Mixing phenomena in a liquid side and inclined nozzles bath stirred by gas jets through side inclined nozzles. ISIJ International. 1993;33(7):740-747. http://dx.doi.org/10.2355/isijinternational.33.740.
8 Guo D, Irons GA. Modeling of gas-liquid reactions in ladle metallurgy: part I: physical modeling. Metallurgical and Materials Transactions. B, Process Metallurgy and Materials Processing Science. 2000;31B(6):1447-1455. http://dx.doi.org/10.1007/s11663-000-0029-8.
9 Nakai Y, Sumi I, Matsuno H, Kikuchi N, Kishimoto Y. Effect of flux dispersion behavior on desulfurization of hot metal. ISIJ International. 2010;50(3):403-410. http://dx.doi.org/10.2355/isijinternational.50.403.
10 Liu Y, Sano M, Zhang TA, Wang Q, He JC. Intensification of bubble disintegration and dispersion by mechanical Stirring in gas injection refining. ISIJ International. 2009;49(1):17-23. http://dx.doi.org/10.2355/isijinternational.49.17.
11 Gadson B, Han X. Hot metal desulphurisation: benefits of magnesium lime co-injection. Milleniun Steel. 2010;31-36.
12 Yang J, Ozaki S, Kakimoto R, Okumura K, Kuwabara M, Sano M. Desulfurization of molten iron with magnesium vapor produced in-situ by carbothermic reduction of magnesium oxide. ISIJ International. 2001;41(9):945-954. http://dx.doi.org/10.2355/isijinternational.41.945.
13 Sun H, Liu Y, Lu M. Behaviour of Ar-1%Mg bubbles in desulfurization of hot metal by magnesium injection. Steel Research International. 2009;80(3):209-217.
14 Nakai Y, Hino Y, Sumi I, Kikuchi N, Uchida Y, Miki Y. Effect of flux addition method on hot metal desulfurization by mechanical stirring process. ISIJ International. 2015;55(7):1398-1407. http://dx.doi.org/10.2355/isijinternational.55.1398.
Facebook
Google+
Twitter
LinkedIn
Mendeley
StumbleUpon
CiteULike
Reddit
Email