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A Feedfor.ar. Contr.ller.to r.gulate the Chemical Composition of Molten Steel in a Continuous Casting Tundish

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Intelligent Contr.l and Automation 2013年第3期4卷 245-249页

作者： Miguel A. barron Dulce Yolotzin Isaias Hiler.o Depar.amento de Mater.ales Universidad Autonoma Metropolitana Azcapotzalco Mexico City Mexico

A feedfor.ar. contr.ller.for.the automatic r.gulation of chemical composition of molten steel in the tundish of a continuous casting machine is pr.posed in this wor.. The flow of molten steel inside the tundish is modeled as a distr.buted par.meter.system, and the r.sulting par.ial differ.ntial equation is tr.nsfor.ed into a set of or.inar. differ.ntial equations by means of the finite differ.nces technique. Fr.m the above set and using a pr.per.boundar. condition, a feedfor.ar. contr.l law is synthesized. No exper.mental tests ar. r.por.ed, however. the dynamic per.or.ance of the contr.ller.is illustr.ted by means of numer.cal simulations.

关键词： Chemical Composition Continuous Casting Distr.buted Par.meter System Feedfor.ar. Contr.ller Molten Steel Tundish

Unsteady Non-Unifor. Flow of Molten Metals in r.ctangular.Open Channels

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Wor.d Jour.al of Engineer.ng and Technology 2022年第3期10卷 593-604页

作者： Miguel A. barron Joan r.yes Dulce Y. Mir.nda Depar.amento de Mater.ales Universidad Autonoma Metropolitana Azcapotzalco Mexico City Mexico

In the metallur.ical industr.es, it is ver. impor.ant to char.cter.ze the flow of molten metals in open channels given that they ar. tr.nspor.ed thr.ugh these devices to differ.nt plant sections. However. unlike the flow of water.which has been studied since ancient times, the flow of molten metals in open channels has r.ceived little attention. The unsteady non-unifor. flow of blast fur.ace molten pig ir.n in a r.ctangular.open channel is analyzed in this wor. by numer.cal solution of the Saint-Venant equations. The influence of mesh size on the conver.ence of molten metal height is studied to deter.ine the pr.per.mesh and time step sizes. A sinusoidal inflow pulse is imposed at the entr.nce of the channel in or.er.to analyze the pr.pagation of the r.sulting wave. The influence of the angle of inclination of the channel and the r.ughness coefficient of the walls on the amplitude and the dynamic behavior.of the height of the molten metal ar. analyzed. Phase por.r.its of the channel state var.ables ar. constr.cted and inter.r.ted. Numer.cal simulations show that as the angle of inclination of the channel incr.ases, the amplitude of the for.ed wave decr.ases. Fr.m 10 degr.es onwar.s, the peak of the wave descends even below the initial height. On the other.hand, the r.ughness coefficient affects the molten pig ir.n height pr.files in an inver.e way than the angle of inclination. The amplitude of the for.ed wave incr.ases as the r.ughness coefficient incr.ases.

关键词： Molten Metals Flow Non-Unifor. Flow Open Channels Pig Ir.n Tr.nspor. Saint-Venant Equations Sinusoidal Pulse Unsteady Flow

A Str.ightfor.ar. Mathematical Model of Hot Metal Desulphur.zation

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Open Jour.al of Applied Sciences 2020年第6期10卷 318-327页

作者： Miguel A. barron Dulce Y. Medina Joan r.yes Depar.amento de Mater.ales Universidad Autonoma Metropolitana Azcapotzalco Mexico City Mexico

A str.ightfor.ar. kinetic model for.the hot metal desulphur.zation pr.cess is pr.sented. The model contains some of the most impor.ant par.meter. and var.ables that gover. the pr.cess. The inputs, outputs and par.mete... 详细信息

A straightforward kinetic model for the hot metal desulphurization process is presented. The model contains some of the most important parameters and variables that govern the process. The inputs, outputs and parameters of a desulphurization program employed at industry are discussed. The model is able to cope with different injection policies of desulphurizers such as mono- injection, co-injection or multi-injection. When compared to the rotary impeller method, results of this model shows that the weight of lime consumed in the lance injection method is lesser than that consumed in the rotary impeller method for the same conditions of the hot metal charge.

关键词： Desulphur.zation Hot Metal Kinetic Model Lance Injection r.tar. Impeller

Bubbling to Jetting Tr.nsition dur.ng Ar.on Injection in Molten Steel

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Wor.d Jour.al of Engineer.ng and Technology 2020年第4期8卷 605-616页

作者： Miguel A. barron Joan r.yes Dulce Y. Medina Depar.amento de Mater.ales Universidad Autonoma Metropolitana Azcapotzalco Mexico City Mexico

Bubbling to Jetting Tr.nsition is of the outmost impor.ance in metallur.ical pr.cesses given that the flow r.gime influences the r.fining r.tes, the r.fr.ctor. er.sion, and the blockage of injection nozzles. Bubbling to jetting tr.nsition dur.ng subsonic bottom injection of ar.on in molten steel is studied her.. The effect of the molten steel height, the injection velocity, the nozzle diameter. and the molten steel viscosity on the jet height and the bubbling to jetting tr.nsition is numer.cally analyzed using Computational Fluid Dynamics. Five subsonic ar.on injection velocities ar. consider.d: 5, 25, 50, 100 and 150 m/s. Thr.e values of the metal height ar. taken into account, namely 1.5 m, 2 m and 2.5 m. Besides, thr.e values of the nozzle diameter. ar. consider.d: 0.001 m, 0.005 m and 0.01 m. Finally, thr.e values of the molten steel viscosity ar. supposed: 0.0067, 0.1 and 1 kg/(m·s). It is observed that for the argon-molten steel system, the bubbling to jetting transition occurs for an injection velocity less than 25 m/s and that for the range of viscosities considered, the molten steel viscosity does not exert significant influence on the jet height and the bubbling to jetting transition. Due to the jet instability at subsonic velocities, a second transition, namely jetting to bubbling, is appreciated.

关键词： Ar.on Injection Bubbling to Jetting Tr.nsition CFD Injection Velocity Jet Height Molten Steel Nozzle Diameter

Inter.ction between a Liquid Sur.ace and an Impinging Gas Jet

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Wor.d Jour.al of Engineer.ng and Technology 2021年第4期9卷 793-803页

作者： Miguel A. barron Dulce Y. Medina Joan r.yes Depar.amento de Mater.ales Universidad Autonoma Metropolitana Azcapotzalco Mexico City Mexico

The water.air.and Wood’s metal-air.systems ar. modeled by means of Computational Fluid Dynamics to study the inter.ction between a liquid sur.ace and an impinging air.jet under.the near.field blowing conditions. The effect of the air.jet velocity, the height of the injection lance, and the density of the liquid on the depth of the for.ed cavity is numer.cally studied. The CFD r.sults of the cavity depth ar. compar.d with r.sults pr.viously r.por.ed by other.author.. The emer.ence of the splashing phenomenon is pr.dicted in ter.s of the cr.tical velocity for.each liquid-air.system. Besides, the blowing number.indicates that the dr.p gener.tion r.te is not significant for.jet velocities below the cr.tical velocity, and ther.for. neither.the splashing is significant.

关键词： Cavity Depth CFD Impinging Gas Jet Lance Height Liquid-Gas Inter.ction Splashing

Unifor. Flow of Molten Metals in r.ctangular.Open Channels

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Wor.d Jour.al of Engineer.ng and Technology 2022年第3期10卷 518-526页

作者： Miguel A. barron Joan r.yes Dulce Y. Medina Depar.amento de Mater.ales Universidad Autonoma Metropolitana Azcapotzalco Mexico City Mexico

The flow of liquids in open channels has been studied since ancient r.me. However. the vast major.ty of published r.por.s on flow in open channels ar. focused on the tr.nspor. of dr.nking water.and sewage disposal. The liter.tur. on the tr.nspor. of molten metals in open channels is quite scar.e. In this wor., the unifor. flow of pig ir.n and molten aluminum in r.ctangular.open channels is studied. Specific ener.y cur.es ar. constr.cted and cr.tical heights ar. analytically deter.ined. The tr.nsition fr.m subcr.tical to super.r.tical flow is analyzed as a function of the angle of inclination of the channel and the r.ughness of its walls. Manning’s equation is applied to the pig ir.n flow using data r.por.ed in the liter.tur. for.molten aluminum. The need to cor.ect the r.ughness coefficient for.pig ir.n is obser.ed in or.er.to obtain r.sults consistent with those pr.viously r.por.ed.

关键词： Cr.tical Height Fr.ude Number Molten Metal Flow Open Channel r.ctangular.Channel Unifor. Flow

r.gulation of the r.acted Layer.Thickness in a Gas-Solid r.acting System

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Intelligent Contr.l and Automation 2014年第3期5卷 91-96页

作者： Miguel A. barron Dulce Y. Medina Gabr.el Plascencia Centr. de Investigacion e Innovacion Tecnologica-IPN Mexico D.F. Mexico Depar.amento de Mater.ales Universidad Autonoma Metropolitana Azcapotzalco Mexico D.F. Mexico

A mathematical model for.the analysis of a gas-solid r.acting system is pr.sented. This model is an alter.ative to the classical shr.nking-cor. model. The model has a str.ctur. that can be easily tr.nsfor.ed into a canonical contr.l for., which is pr.per.for.contr.ller.synthesis. Analytical solution of the model to descr.be the open-loop behavior.is expr.ssed in ter.s of the Lamber. function. The Lamber. function is evaluated fr.m aTaylor.xpansion ser.es. Besides, a contr.ller.is pr.posed to r.gulate the r.acted layer.thickness using initially the diffusion coefficient as contr.l input. The contr.l law is synthesized employing the feedback linear.zation technique. Main contr.butions of this wor. ar. the synthesis of the layer.thickness contr.ller. and the employment of the pr.cess temper.tur. as substitute of the diffusion coefficient as the contr.l input.

关键词： Diffusion Coefficient Feedback Linear.zation Gas-Solid System Lamber. Function r.acted Layer Thickness r.gulation

Collective Behavior.of a r.ng of Van Der.Pol Oscillator. under.Gaussian and r.ndom Coupling Schemes

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Open Jour.al of Applied Sciences 2014年第7期4卷 383-391页

作者： Miguel A. barron Dulce Y. Medina Isaias Hiler.o Depar.amento de Mater.ales Universidad Autonoma Metropolitana-Azcapotzalco Mexico D.F. Mexico

The collective behavior.of a r.ng of coupled identical van der.Pol oscillator. is numer.cally studied in this wor.. Constant, gaussian and r.ndom distr.butions of the coupling par.meter.along the r.ng ar. consider.d. Thr.e values of the oscillator. constant ar. assumed in or.er.to cover.fr.m quasilinear.to nonlinear.dynamic per.or.ance. Single and multiple coupled fr.quencies ar. obtained using power.spectr. of the long ter. time ser.es. Phase por.r.its ar. obtained fr.m numer.cal simulations, and the coupled behavior.is analyzed, compar.d and discussed.

关键词： Coupled Oscillator. Coupling Par.meter Gaussian Distr.bution Oscillator. r.ng r.ndom Distr.bution Van Der Pol Oscillator

Numer.cal Simulation of Decar.ur.zation in a Top-Blown Basic Oxygen Fur.ace

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Modeling and Numer.cal Simulation of Mater.al Science 2014年第3期4卷 94-103页

作者： Miguel A. barron Dulce Y. Medina Isaias Hiler.o Depar.amento de Mater.ales Universidad Autonoma Metropolitana-Azcapotzalco Mexico City Mexico

An impr.ved mathematical model to descr.be the decar.ur.zation pr.cess in basic oxygen fur.aces for.steelmaking is pr.sented in this wor.. This model takes into account those factor. or.par.meter. that deter.ine the bath-oxygen impact ar.a, such as the cavity depth, the lance height, the number.of nozzles and the nozzles diameter. In the ther.al issue, the model includes the tar.eted car.on content and temper.tur.. The model is numer.cally solved, and is validated using r.por.ed data plant. The oxygen flow r.te and the lance height ar. var.ed in the numer.cal simulations to study their.effect on the car.on content and decar.ur.zation r.te.

关键词： Basic Oxygen Fur.ace Car.on Content Decar.ur.zation Lance Height Numer.cal Simulation Oxygen Flow r.te Oxygen Steelmaking