Numerical Simulation Of The Magneto Thermal Fluid Solid Coupling In SEN And Mold Of Thin Slab Continuous Casting

Since its advent,thin slab continuous casting technology has been widely concerned in the steel industry.For more than 30 years,thin slab continuous casting and rolling technology has been progressing towards more efficiency,high quality,low consumption and green environmental protection through continuous innovation and development.And the SEN and mold in the liquid steel flow state is often very key factors,to achieve more high quality and efficient production,to control the mold in the liquid steel flow state ideal and SEN long life,therefore,in the process of continuous casting production in the liquid steel flow and stress of the SEN has become a worthy of research subject.In this thesis,the multi-mode continuous casting and rolling production line(MCCR),a new generation of thin slab continuous casting crystal device as a research object,First,a three-dimensional magnetic-heat-flow coupling simulation model using FLUENT software,Numerical simulation study of the internal flow field and temperature field of MCCR continuous casting device,The influence of the current strength,pulling speed and immersion depth on the flow field and temperature field;Then we model the three-dimensional thermal-fluid-structure coupling by one-way using ANSYS software,Numerical simulation study of the temperature field and force state of the actual SEN in continuous casting production,The effect of heat transfer and flow on water force is investigated.The main study results are presented as follows:(1)With the increase of current strength,the maximum temperature of the molten steel surface of the mold increases from 1811.07 K to 1813.12 K,and the maximum speed of molten steel surface level is reduced to 0.278 m/s when it is 400 A,which is less than the critical speed of slag coil.The electromagnetic brake(EMBr)coil current 400 A is the recommended minimum current;the flow field and temperature field of the MCCR mold are directly affected by the coil current and the immersion depth of the new EMBr.The immersion depth of the SEN is increased from 120 mm to 200 mm,the maximum speed of the molten steel surface level is reduced to 0.278 m/s,and the range of slag line change of 80 mm can be adapted to continuous casting production.(2)When the thickness of the lining layer is 5mm and the thickness of the insulation layer is 3mm,the temperature difference of the nozzle body is small,and the maximum stress value is 3.76 MPa,which is relatively small.This nozzle structure can effectively avoid the possibility of cracking of the SEN caused by temperature stress.