Discharge nozzle for installation inside the base of a metallurgical vessel

Abstract

The invention relates to a discharge nozzle for an arrangement inside or at the base of a metallurgic vessel with an upper end, preferably for the connection to a metallurgic vessel or to a sliding valve of a metallurgic vessel, and a lower end, whereat a flow-through channel with at least one discharge opening at its lower end is arranged between the two ends, whereat the radially to the outside pointing wall of the flow-through channel is surrounded by a gas-proof case, characterized by the fact that the case surrounds the lower end with at least one discharge opening in a gas proof manner. The invention further relates to a method for operating a bottom discharge nozzle.

1 . Bottom discharge nozzle with an upper end and a lower end, whereat a flowthrough channel ( 1 ) with at least one discharge opening ( 2 ) at its lower end is arranged between the two ends, whereat the radially to the outside pointing wall ( 3 ) of the flow-through channel ( 1 ) is surrounded by a gas-proof case ( 7 ), characterized in that the case ( 7 ) surrounds the lower end with the at least one discharge opening gas proof in such a way that a high pressure or a low pressure is achievable within the whole volume within the case ( 7 ) when the bottom discharge nozzle is arranged in or at the bottom of a metallurgical vessel. 
     
     
         2 . Discharge nozzle according to  claim 1 , characterized in that the case features multiple case parts that are connected in a gas proof manner. 
     
     
         3 . Discharge nozzle according to  claim 1 , characterized in that the case ( 7 ) is made of metal. 
     
     
         4 . Discharge nozzle according to  claim 2 , characterized in that the case ( 7 ) features a lower case part made out of steel which surrounds at least the lower end with the at least one discharge opening ( 2 ) in a gas-proof manner and that above that a gas-proof case part which is designed as an integral part of the wall is arranged. 
     
     
         5 . Discharge nozzle according to  claim 2 , characterized in that the case ( 7 ) features a lower case part made of steel which is implemented in a gas-proof manner into the lower end with the at least one discharge opening ( 2 ) and that a gas-proof case part as an integral part of the wall is arranged above, so that the discharge opening ( 2 ) is closed by a plug, whereby the outer circumference of the discharge nozzle features a gas-proof surface as a part of the case. 
     
     
         6 . Discharge nozzle according to  claim 1 , characterized in that within the case ( 7 ) a getter material is arranged, made of at least one metal of the group silicon, calcium, titanium, aluminium, magnesium or zirconium. 
     
     
         7 . Discharge nozzle according to  claim 1 , characterized in that a heating is arranged inside the wall of the flow-through channel ( 1 ). 
     
     
         8 . Discharge nozzle according to  claim 1 , characterized in that a layer of a dividing material, like paper, is arranged around the outer surface of the discharge nozzle. 
     
     
         9 . Discharge nozzle according to  claim 1 , characterized in that the outer surface of the wall is surrounded by an insulating cement seal at its upper end, below the gas-proof case. 
     
     
         10 . Discharge nozzle according to  claim 1 , characterized in that the outer circumference of the wall is surrounded by an isolating material at its lower end, below the gas-proof case. 
     
     
         11 . Discharge nozzle according to  claim 9 , characterized in that the insulating material can be arranged directly below the cement seal ( 5 ). 
     
     
         12 . Discharge nozzle according to  claim 1 , characterized in that below the gas-proof case gas ( 7 ) gas channels ( 27 ) are arranged in the lengthwise direction of the nozzle. 
     
     
         13 . (canceled) 
     
     
         14 . Method for the operation of a bottom discharge nozzle, characterized in that the discharge nozzle is arranged at a sliding gate valve or a stopper rod closure of a metallurgic vessel and that before the opening of the sliding gate valve or the stopper rod closure either a vacuum is created or a noble gas flushing with a subsequent creation of a noble gas excess or high pressure takes place in the discharge nozzle and that the sliding gate valve or the stopper rod closure is opened afterwards. 
     
     
         15 . Method according to  claim 14 , characterized in that after the opening of the sliding gate valve or the stopper rod closure either
 a) a noble gas high pressure is created, if a low pressure was present before the opening or   b) a low pressure is created, if a high pressure was present before the opening.   
     
     
         16 . Method according to  claim 14 , characterized in that the low pressure is 1 to 1013 mbar.