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In order to take advantages of the slag, its height should be in the optimal range.
However; since at this point this is still a conceptual study, operation of the hatches and the mechanisms should be thoroughly tested in practice for its reliability.The conditions, which occur due to excess slag, lead to increased energy losses due to contact between the slag and the furnace surfaces (water cooled panels, electrodes, roof etc.), refractory erosion, as well as unwanted electrical currents from the electrodes to the furnace surfaces.It is possible that excess slag causes energy losses to furnace surfaces exceeding the energy savings otherwise gained by the slag.In normal operation, an EAF equipped with a standard slag doors is tilted for 15 to 20° in order to deslag the bath at tapping1) J. Innovations related to slag doors as well as concepts to remove an optimum amount of excess slag are seldom reported.Most innovations focus on sealing the openings around the slag door due to its negative effects.Whether the mechanism is inappropriate, another maintenance-free door design should be used.
In general, the doors are intended to function as a conventional slag door as well as to reduce energy losses due to excess slag.
The bottom edge of the lower hatch should be placed slightly above the maximum steel bath height at tapping.
In this manner, only slag is removed when deslagging.
Wunsche invented a slag door including at least one moveable water cooled panel that covers the opening around the door and can remove the slag around it.
These innovations do not allow removal of a determined amount of slag based on bath and slag heights.
Below, a simulation based calculation is shown, comparing the energy consumption and tap-to-tap times of a conventional EAF and an EAF with the proposed slag doors.