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Santana do Paraíso, Brazil

Maia B.T.,Lumar Metals Research | Imagawa R.K.,Federal University of Minas Gerais | Petrucelli A.C.,Federal University of Minas Gerais | Tavares R.P.,Federal University of Minas Gerais
Journal of Materials Research and Technology | Year: 2014

It is important to know about the bath behavior to reduce the blow time and splashing in top of the converter. The target of this work is to compare works on the effect of twisted nozzle, flow and lance height in the jet penetration by visual inspection and by energy balance that consider number of nozzles, vertical and twist angles. In the present work, lances with twisted nozzle angles, normal lances and special nozzle shape were used to describe the effects of jet on bath. Jet penetration and level of splashing were also available. For the four nozzles, the best result to reduce spitting was obtained at the twist angle, hard blow and high flow. High flow, reduction in bath lance distance and lower nozzle angle promoted a higher penetration, but with bad results for the process. The energy balance showed to be a proper tool to promote adjustments in process. © 2014 Brazilian Metallurgical, Materials and Mining Association. Source


Santos B.O.D.A.,Lumar Metals Research | Maia B.T.,Lumar Metals Research | Garajau F.S.,Lumar Metals Research | Guerra M.D.S.L.,Lumar Metals Research | And 2 more authors.
Journal of Materials Research and Technology | Year: 2014

The Injection of powdered materials in blast furnaces is a great option for reducing costs, increasing productivity and satisfy the environmental norms. Thus, this paper presents a study on the use of a flame stabilization system with rotation, designed to promote greater coal injection in the combustion zone, reducing losses and increasing the efficiency of the equipment. A physical model was used to evaluate scattering of pulverized fuel and is compared with numerical results in the same scale. In the second step, a combustion model was added to the numerical simulation, using dimensions of a real blast furnace. Fields like temperature, velocity and behavior of chemical reactions were analyzed. The results showed that double lances promote better particle injection when compared with simple lance for reduced material injection. The new injection system proposed, with swirl numbers of 0.12 and 0.24, promoted a better injection of both reduced material and temperature in the raceway zone. The swirl 0.24 showed superior performance when compared to other injection systems. © 2014 Brazilian Metallurgical, Materials and Mining Association. Source


De Almeida Santos B.O.,Lumar Metals Research | Maia B.T.,Lumar Metals Research | Garajau F.S.,Lumar Metals Research | Lima Guerra M.D.S.,Lumar Metals Research | And 4 more authors.
Journal of Materials Research and Technology | Year: 2012

In this work an analysis of gases' behavior into primary dedusting system of basic oxygen furnace (BOF) converter was developed. The methodology involves Computational Fluid Dynamics (CFD) to simulate velocity, temperature of gases in combustion for multi-phases systems including solid particles. The influence of the air in the flow, analysis of temperature and gas along the dedusting system and the influence in cooling pipes was investigated. Numerical data were validated with real values of the process. The next step was the implementation of changes in the geometry of the ducts in order to find a more stable situation for the equipment. The best result was obtained by increasing the diameter and smoothing the geometries in curves. © 2012 Elsevier Editora Ltda. and Brazilian Metallurgical, Materials and Mining Association. Source

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