STAR-CCM+ CM+ modeling ling of steel el makin ing g processes - PowerPoint PPT Presentation

STAR-CCM+ CM+ modeling ling of steel el makin ing g processes esses Simon mon Lo

Steel el ma making g processes cesses Blast t Fur urnace ce Basi sic c Ox Oxyge ygen n Fur urnace ce (BOF OF) Continuous ntinuous casting ng

Bl Blas ast t furnace ace

DEM EM - Char arging ing of par arti ticles cles 4

Lifti ting ng of par arti ticles cles by ai air flo low 5

With th heat at tr tran ansfer er 6

Therm hermal al exp xpan ansion sion of par arti ticles cles In Blast fur urnace ce, , the effect ect of solid d expansi ansion on due ue to temperature perature may be imp mpor orta tant nt STAR AR-CC CCM+ M+ has the capability lity – Using variable density model 7

Un Unloading loading of par arti ticl cles es 8

Bu Bulk lk flo low w val alidat ation ion Un Unloading oading qua uazi-2D 2D blast fur urna nace ce – stagna nant nt zone e forma rmati tion on Pap Paper: r: Z. Zhou ou, , H. Zhu, u, ISI SIJ Vol 45, 2005 05 STAR AR-CCM+ CCM+ resu sults ts in agreem eemen ent t with bot oth h exper perime iment nt and independ ependen ent t code de resul ults ts 9

Summar mary y of coupl pled ed DEM-CFD FD BF s F sim imulati tion on Analysis ysis of volume e fracti tion on distr trib ibut ution ion – Predicted the amount of load lifting after staring injecting air Computation putation time me for a m milli lion n parti ticles les is get etti ting ng close to reasonab sonable le – 1,003,146 particles – Simulated 0.2 seconds of physical time – Took ~48 hours on 96 cores – Used DEM timestep ~ 5.3E-6 s 10 10

Euleri Eu lerian an mu mult ltipha phase se mo model el Full size furnace: • 25m height • 7.2m hearth diameter • 2D axisymmetric model • M ulti-component Eulerian phases: •  Gas phase: CO, CO2, N2  Solid phase: Ore, Coke, Fe, Fe2O3, C Two reactions: •  Fe2O3 + 3CO -> 2Fe + 3CO2  C + CO2 -> 2CO 11 11

Tem emper peratures atures 12

Fe/Ore e/Ore ma mass frac acti tions ons 13

CO/CO2 O/CO2 ma mass frac action tions 14

Ba Basic c Ox Oxygen en Furna nace ce (B (BOF OF) Oxygen gen is blown wn onto o the e met etal al bath h to oxidi idize ze elements ements su such as silicon on and phosp spho horou ous. s. Due ue to stron ong g stirring ing inside ide the vessel el oxide ides are transf sferred erred from om met etal al to slag.

Basic Ba c Ox Oxygen en Furna nace ce (B (BOF OF) Liquid uid steel el is pour ur from conver erter er to ladle e throu ough gh taphole le. Dart designe gned d to float at interface ace betw etwee een n steel el and slag. Near ar end of tapping, g, dart is suc ucked ed into o the taphole ole block cking ng the flow and limit slag carry-over er into the ladle. e. Converter in tapping position

Dar art t suck cked ed into th the ta taphole ole

Cont ontinuous inuous ca casti ting ng of steel

Cont ontinuous inuous ca casti ting ng of steel

Cont ontinuous inuous ca casti ting ng of steel