Impact of submerged entry nozzle parameters on the thickness of the liquid slag layer in the continuous casting mold
The low drawing speed and slow updating of liquid level in continuous casting of special steel large square billet are easy to cause bad melting of mold slag,resulting in insufficient supply of liquid slag in the mold and cracks on the surface of the billet.In order to reveal the variation rule of liquid slag layer thickness of mold slag under dif-ferent mold flow fields,a numerical simulation method for calculating liquid slag layer thickness in mold was devel-oped.Firstly,a three-dimensional flow field-temperature coupling model was established to simulate and study the flow law between molten steel and mold slag under different nozzle parameters.Then,based on the interface heat transfer state of steel slag,the thickness of mold liquid slag layer under different nozzle types,immersion depths,side hole angles and side hole shapes and sizes was predicted.The results show that the thickness of liquid slag layer increases gradually with the increase of the number of side pores.With the increase of dip depth and dip angle,the thickness of liquid slag layer decreases gradually.With the change of the shape and size of the orifice side,the thick-ness of the liquid slag layer increases with the increase of the outlet area.
special steelsquare billetthickness of liquid slag layermold slagnumerical simulation
NETL
NSTL
万方数据
