The Experts below are selected from a list of 14994 Experts worldwide ranked by ideXlab platform
A N Conejo - One of the best experts on this subject based on the ideXlab platform.
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Effect of Separation Angle and Nozzle Radial Position on Mixing Time in Ladles with Two Nozzles
Isfahan University of Technology, 2018Co-Authors: A. S. Gómez, A N Conejo, V. R. ZenitAbstract:Chemical, thermal and mechanical homogenization of both slag and steel during the Ladle furnace process depends on the design of the gas injection system in gas bottom stirred Ladles. In the past, a large number of variables have been investigated, nevertheless due to the importance of the slag layer during the process, it has been incorporated in water modeling studies in more recent investigations. In large industrial size Ladles is common to use two porous plugs. The configuration of the injection system with two porous plugs requires optimization of both nozzle radial position and nozzle separation angle. In this work the effect of nozzle radial position, nozzle separation angle, gas flow rate and slag thickness on mixing time has been investigated using a water model. The effect of tracer concentration on mixing time was also explored. It is shown that a separation angle of 60 degrees provides the best mixing efficiency
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PRICM: 8 Pacific Rim International Congress on Advanced Materials and Processing - Mathematical Modeling of Bottom Gas Injection in Industrial Metallurgical Ladles in the Presence of a Top Layer of Slag
Proceedings of the 8th Pacific Rim International Congress on Advanced Materials and Processing, 2013Co-Authors: D. A. Nunez, Marco A. Ramírez-argáez, A N ConejoAbstract:A research involving the effect of gas flow rate, radial position of porous plugs and its separation angle, taking into consideration the presence of a top slag layer, on mixing behavior in an industrial metallurgical Ladle has been carried out using a computational Fluid Flow (CFD) code. In order to minimize mixing time, optimum values for the gas flow rate and radial position have been identified. Model predictions have been validated with measurements of mixing time in industrial Ladles.
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effects of top layer nozzle arrangement and gas flow rate on mixing time in agitated Ladles by bottom gas injection
Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science, 2013Co-Authors: A N Conejo, Shinya Kitamura, Nobuhiro MaruokaAbstract:This research investigates mixing phenomena in bottom gas-stirred Ladles using water modeling, which incorporates hexane as the top layer. The effects of slag thickness, nozzle position, number of nozzles, and gas flow rate on mixing time have been investigated. Conditions to improve mixing time have been identified. A single nozzle located at two-thirds of the Ladle radius was found to produce the shortest mixing time. Under extremely low gas flow rates, an unusual behavior was observed, where the top layer promoted a decrease in mixing time.
Gordon A. Irons - One of the best experts on this subject based on the ideXlab platform.
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A Critical Review of the Modified Froude Number in Ladle Metallurgy
Metallurgical and Materials Transactions B, 2013Co-Authors: Krishnakumar Krishnapisharody, Gordon A. IronsAbstract:The modeling of gas–liquid plumes in steelmaking Ladles has been the subject of many investigations. In most studies, the “modified” Froude number, based on the momentum of the injected gas, has been employed to characterize two-phase plumes. This approach has several shortcomings and is critically reviewed in the present work. Based on an extensive review of previous work and theoretical considerations, it is demonstrated that the injected momentum and consequently, the modified Froude number has no significance to gas blowing operations in Ladle Metallurgy. Instead, an approach based on the “plume” Froude number, derived from the buoyancy of the plume, is shown to be more useful in modeling the plume as well as Ladle hydrodynamics. The dissipation behavior of the gas momentum in the vicinity of the injector is further clarified.
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EPD Congress 2012 - A Critical Review of the Modified Froude Number in Ladle Metallurgy
EPD Congress 2012, 2012Co-Authors: Krishnakumar Krishnapisharody, Gordon A. IronsAbstract:The modeling of gas–liquid plumes in steelmaking Ladles has been the subject of many investigations. In most studies, the “modified” Froude number, based on the momentum of the injected gas, has been employed to characterize two-phase plumes. This approach has several shortcomings and is critically reviewed in the present work. Based on an extensive review of previous work and theoretical considerations, it is demonstrated that the injected momentum and consequently, the modified Froude number has no significance to gas blowing operations in Ladle Metallurgy. Instead, an approach based on the “plume” Froude number, derived from the buoyancy of the plume, is shown to be more useful in modeling the plume as well as Ladle hydrodynamics. The dissipation behavior of the gas momentum in the vicinity of the injector is further clarified.
J Poirie - One of the best experts on this subject based on the ideXlab platform.
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the development of a thermodynamic model for al2o3 mgo refractory castable corrosion by secondary metallurgy steel Ladle slags
Ceramics International, 2009Co-Authors: Jerome Erjonneau, Pascal Prige, J PoirieAbstract:Alumina magnesia in situ spinel castables are used as Ladle refractory lining in the steel industry. In contact with slag, they suffer degradations which limits their performance. The purpose of this article is to predict the thermochemical attack of a slag on alumina magnesia refractory using Factsage® thermodynamic modeling. To evaluate the reliability of the thermodynamic results, a validation step was carried out, which supported that the database was well adapted to the alumina magnesia spinel system. The corrosion phenomenon was then computed for a simple to a complete system to understand the mechanism and the influence of specific oxides. The model was also compared to corroded microstructures from a steel Ladle to evaluate the contribution of each constituent in the castable. The aggregates of alumina react with slag to produce monomineral layers of lime aluminates (CA6 and CA2), while complex spinels (Mg, Fe, Mn)O (Fe2, Al2)O3 are formed from the reaction of the slag with the matrix of the castable. Several oxides (MnO, FeO, Fe2O3) from the slag contribute to the formation of the spinel structures. The microstructures of refractories used in steel Ladles confirm the main conclusions and the thermodynamic approach.
Marco A. Ramírez-argáez - One of the best experts on this subject based on the ideXlab platform.
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PRICM: 8 Pacific Rim International Congress on Advanced Materials and Processing - Mathematical Modeling of Bottom Gas Injection in Industrial Metallurgical Ladles in the Presence of a Top Layer of Slag
Proceedings of the 8th Pacific Rim International Congress on Advanced Materials and Processing, 2013Co-Authors: D. A. Nunez, Marco A. Ramírez-argáez, A N ConejoAbstract:A research involving the effect of gas flow rate, radial position of porous plugs and its separation angle, taking into consideration the presence of a top slag layer, on mixing behavior in an industrial metallurgical Ladle has been carried out using a computational Fluid Flow (CFD) code. In order to minimize mixing time, optimum values for the gas flow rate and radial position have been identified. Model predictions have been validated with measurements of mixing time in industrial Ladles.
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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, 2013Co-Authors: Eudoxio Ramos Gómez, Roberto Zenit, Carlos González Rivera, Gerardo Trapaga, Marco A. Ramírez-argáezAbstract:In the current study a transparent water physical model was developed to study fluid flow and turbulent structure of aluminum Ladles for degassing treatment with a rotating impeller and gas injection. Flow patterns and turbulent structure in the Ladle were measured with the particle image velocimetry technique. The effects of process parameters such as rotor speed, gas flow rate, and type of rotor on the flow patterns and on the vortex formation were analyzed using this model, which control degassing kinetics. In addition, a comparison between two points of gas injection was performed: (a) conventional gas injection through the shaft and (b) a “novel” gas injection technique through the bottom of the Ladle. Results show that the most significant process variable on the stirring degree of the bath was the angular speed of the impeller, which promotes better stirred baths with smaller and better distributed bubbles. A gas flow rate increment is detrimental to stirring. Finally, although the injection point was the less-significant variable, it was found that the “novel” injection from the bottom of the Ladle improves the stirring in the Ladle, promotes a better distribution of bubbles, and shows to be a promising alternative for gas injection.
Krishnakumar Krishnapisharody - One of the best experts on this subject based on the ideXlab platform.
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A Critical Review of the Modified Froude Number in Ladle Metallurgy
Metallurgical and Materials Transactions B, 2013Co-Authors: Krishnakumar Krishnapisharody, Gordon A. IronsAbstract:The modeling of gas–liquid plumes in steelmaking Ladles has been the subject of many investigations. In most studies, the “modified” Froude number, based on the momentum of the injected gas, has been employed to characterize two-phase plumes. This approach has several shortcomings and is critically reviewed in the present work. Based on an extensive review of previous work and theoretical considerations, it is demonstrated that the injected momentum and consequently, the modified Froude number has no significance to gas blowing operations in Ladle Metallurgy. Instead, an approach based on the “plume” Froude number, derived from the buoyancy of the plume, is shown to be more useful in modeling the plume as well as Ladle hydrodynamics. The dissipation behavior of the gas momentum in the vicinity of the injector is further clarified.
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EPD Congress 2012 - A Critical Review of the Modified Froude Number in Ladle Metallurgy
EPD Congress 2012, 2012Co-Authors: Krishnakumar Krishnapisharody, Gordon A. IronsAbstract:The modeling of gas–liquid plumes in steelmaking Ladles has been the subject of many investigations. In most studies, the “modified” Froude number, based on the momentum of the injected gas, has been employed to characterize two-phase plumes. This approach has several shortcomings and is critically reviewed in the present work. Based on an extensive review of previous work and theoretical considerations, it is demonstrated that the injected momentum and consequently, the modified Froude number has no significance to gas blowing operations in Ladle Metallurgy. Instead, an approach based on the “plume” Froude number, derived from the buoyancy of the plume, is shown to be more useful in modeling the plume as well as Ladle hydrodynamics. The dissipation behavior of the gas momentum in the vicinity of the injector is further clarified.
