Numeric model of an electromagnetic brake influencing the steel flow in a continuous slab caster
Sprache des Vortragstitels:
2nd ESTAD Conference 2015
Sprache des Tagungstitel:
In the continuous casting of steel slabs the demand for higher production rates requires a higher throughput and therefore higher casting speeds. As a drawback this can also lead to a degradation of the quality and cleanliness of the end product because the submerged jets penetrate deeper into the liquid core and the turbulence level increases. One suggested strategy to counter this behaviour is the employment of electromagnetic brakes. These devices shall brake the jet, dampen the turbulent movement and thereby calm the flow in the liquid core of the strand. Although their usage is often recommended and widely advertised, not all occurring effects are well understood.
Due to the harsh environment at the steel plant, measurements are rather difficult to perform. So in the present work, electromagnetic braking for the continuous casting process is investigated mainly through numerical simulations. For validation a physical 1:10 scale liquid metal model of the slab casting process is used, where the flow field under the influence of a level-EMBR can be measured. In the simulation approach an electromagnetic model of the EMBR is implemented and the resulting magnetic field validated with measurement data. This EMBR field is an input for the flow field simulation of the 1:10 model, employing a monolithic approach. The results are compared with velocity measurements from the experiment. Once the simulation method is validated, it can be used to investigate real slab casters with various EMBR setups. With the help of numeric simulations a better insight into the interaction of the liquid steel flow with the electromagnetic field can be gained and more detailed information of the flow can be obtained.