Molten steel level stability in continuous casting slab mold under electromagnetic stirring
|
摘要
Fluctuation of molten steel level in continuous casting process is a critical issue. The analytic function for the liquid steel surface stability index( F) of the continuous casting slab mold under the action of electromagnetic stirring was derived. The effects on the F value of the electromagnetic field,casting mold,submerged entry nozzle,and casting speed were observed,and the stability of the process parameters of a practical continuous casting system was evaluated. The main results generated are as follows:①Based on the free flow jet theory,a formula is established for the level stability index of continuous casting slab mold under electromagnetic stirring.②According to the results of calculation,the various parameters in decreasing order of the magnitude of their influence are magnetic flux density,nozzle submersion depth,casting speed,slab width,stirring current frequency,and nozzle side-hole inclination angle.③For practical continuous casting with a slab thickness of 230 mm,the calculated F values are between 3 and 5 for different matches between slab width and casting speed,but the parameter optimization space is much larger for wider slab widths and lower casting speeds.
Fluctuation of molten steel level in continuous casting process is a critical issue. The analytic function for the liquid steel surface stability index( F) of the continuous casting slab mold under the action of electromagnetic stirring was derived. The effects on the F value of the electromagnetic field,casting mold,submerged entry nozzle,and casting speed were observed,and the stability of the process parameters of a practical continuous casting system was evaluated. The main results generated are as follows:①Based on the free flow jet theory,a formula is established for the level stability index of continuous casting slab mold under electromagnetic stirring.②According to the results of calculation,the various parameters in decreasing order of the magnitude of their influence are magnetic flux density,nozzle submersion depth,casting speed,slab width,stirring current frequency,and nozzle side-hole inclination angle.③For practical continuous casting with a slab thickness of 230 mm,the calculated F values are between 3 and 5 for different matches between slab width and casting speed,but the parameter optimization space is much larger for wider slab widths and lower casting speeds.
Fluctuation of molten steel level in continuous casting process is a critical issue. The analytic function for the liquid steel surface stability index( F) of the continuous casting slab mold under the action of electromagnetic stirring was derived. The effects on the F value of the electromagnetic field,casting mold,submerged entry nozzle,and casting speed were observed,and the stability of the process parameters of a practical continuous casting system was evaluated. The main results generated are as follows:①Based on the free flow jet theory,a formula is established for the level stability index of continuous casting slab mold under electromagnetic stirring.②According to the results of calculation,the various parameters in decreasing order of the magnitude of their influence are magnetic flux density,nozzle submersion depth,casting speed,slab width,stirring current frequency,and nozzle side-hole inclination angle.③For practical continuous casting with a slab thickness of 230 mm,the calculated F values are between 3 and 5 for different matches between slab width and casting speed,but the parameter optimization space is much larger for wider slab widths and lower casting speeds.
引文
[1]DIAO J,XIE B and LI Y G.Numerical simulation of flow field in slab continuous casting mould[J].Journal of Iron and Steel Research,2008,20(11):15-19.
[2]LIU G L,WU S Z,ZHANG J M,et al.Numerical simulation on the surface fluctuation of molten steel in a w ide slab continuous casting mold[J].Journal of University of Science and Technology Beijing,2009,31(2):229-233.
[3]WANG Z G,ZHANG X W,WANG Y,et al.Water simulation of asymmetry vortex in continuous casting of slab[J].Journal of Iron and Steel Research,2010,22(7):10-14.
[4]LIN X C,LI J S,YANG S F,et al.Water model experiments on surface flow fluctuation patterns in slab caster mold[J].Steelmaking,2011,27(2):56-60.
[5]TESHIMA T,KUBOTA C,SUZUKI M,et al.The effect of casting conditions on the flow of molten steel at slab high speed continuous casting[J].Iron&Steel,1993,79(5):576-582.
[6]LU Q T,WANG X H,YU H X,et al.Calculation of Fvalue and relationship betw een F value and slag entrapment in a slab continuous casting mold[J].Journal of University of Science and Technology Beijing,2007,29(8):811-815.
[7]QI X X and BAO Y P.Discussion on slag entrapment in continuous casting mold[J].Research on Iron&Steel,2005(3):17-20.
[8]JIN X L and ZHOU Y M.Study on numerical simulation on electromagnetic stirring in continuous casting mold and optimization of parameters[J].Continuous Casting,2015(1):27-30.
[9]LIANG Z C.Engineering turbulence[M].Wuhan:Huazhong University of Science and Technology Press,1991:153-157.
[10]JIN X,MENG Z Y,REN T Z,et al.Level fluctuation in continuous casting mold based on theory of turbulent submerged jet[J].Iron and Steel,2017,52(3):42-48.
[11]SCHAUER J J and EUSTIS R H.The flow development and heat transfer characteristics of plane turbulent impinging jets[J].Mechanical Engineering,1963,10(3):86.
[12]MAO B,ZHANG G F and LI A W.Theory and technology of electromagnetic stirring for continuous casting steel[M].Beijing:M etallurgical Industry Press,2012:170.
[13]ZENG J,ZHANG S L,CAO C F,et al.Comparison between permanent magnet stirring and final electromagnetic stirring during continuous casting bloom[J].Steelmaking,2016,32(2):36-40.
[2]LIU G L,WU S Z,ZHANG J M,et al.Numerical simulation on the surface fluctuation of molten steel in a w ide slab continuous casting mold[J].Journal of University of Science and Technology Beijing,2009,31(2):229-233.
[3]WANG Z G,ZHANG X W,WANG Y,et al.Water simulation of asymmetry vortex in continuous casting of slab[J].Journal of Iron and Steel Research,2010,22(7):10-14.
[4]LIN X C,LI J S,YANG S F,et al.Water model experiments on surface flow fluctuation patterns in slab caster mold[J].Steelmaking,2011,27(2):56-60.
[5]TESHIMA T,KUBOTA C,SUZUKI M,et al.The effect of casting conditions on the flow of molten steel at slab high speed continuous casting[J].Iron&Steel,1993,79(5):576-582.
[6]LU Q T,WANG X H,YU H X,et al.Calculation of Fvalue and relationship betw een F value and slag entrapment in a slab continuous casting mold[J].Journal of University of Science and Technology Beijing,2007,29(8):811-815.
[7]QI X X and BAO Y P.Discussion on slag entrapment in continuous casting mold[J].Research on Iron&Steel,2005(3):17-20.
[8]JIN X L and ZHOU Y M.Study on numerical simulation on electromagnetic stirring in continuous casting mold and optimization of parameters[J].Continuous Casting,2015(1):27-30.
[9]LIANG Z C.Engineering turbulence[M].Wuhan:Huazhong University of Science and Technology Press,1991:153-157.
[10]JIN X,MENG Z Y,REN T Z,et al.Level fluctuation in continuous casting mold based on theory of turbulent submerged jet[J].Iron and Steel,2017,52(3):42-48.
[11]SCHAUER J J and EUSTIS R H.The flow development and heat transfer characteristics of plane turbulent impinging jets[J].Mechanical Engineering,1963,10(3):86.
[12]MAO B,ZHANG G F and LI A W.Theory and technology of electromagnetic stirring for continuous casting steel[M].Beijing:M etallurgical Industry Press,2012:170.
[13]ZENG J,ZHANG S L,CAO C F,et al.Comparison between permanent magnet stirring and final electromagnetic stirring during continuous casting bloom[J].Steelmaking,2016,32(2):36-40.