An Evaluation of Gas Injection Effects in a Mechanically Stirred Hot Metal Desulfurization System

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: Kanbara Reactor; Desulfurization; Gas injection; Stirred tank. UMA AVALIAÇÃO DOS EFEITOS DA INJEÇÃO DE GÁS EM UM SISTEMA MECANICAMENTE AGITADO DE DESSULFURAÇÃO DE FERRO GUSA ResumoTécnicas 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.

Powder Injection Effect on Hot Metal Desulfurization Behavior in the Kanbara Reactor: a Transient 3D Coupled Numerical Model

“…2) The KR method has been explored by physical analog models and numerical simulations, which revealed its fluid flow patterns and particle motion behavior. [3][4][5][6][7][8][9][10][11] The dispersion of desulfurizing agent (DA) particles in the hot metal directly affects desulfurization efficiency. 11,12) To reduce the DA amount used per ton of hot metal, it is necessary to enhance the DA reaction efficiency.…”

Effect of impellers on particle mixing behaviour in KR desulphurization process

“…Plenty of literature has been published on the experimental aspects of the KR process, e.g. impeller practice [3][4][5][6], particles addition mode [7,8], operation parameters improvement [9][10][11], stirring mode changing [6,[12][13][14][15], adding barriers (such as baffle or pin fins) in the molten pool [6,16,17]. The problem of desulphurizer low utilization rate has been improved to some extent, but some of the results are difficult to operate in desulphurization practice, which limits the improving of reagent efficiency fundamentally.…”