Method and device for cooling the copper plates of a continuous casting ingot mould for liquid metals, especially liquid steel

Abstract

The invention relates to a device for cooling the copper plates ( 1.1 ) of a continuous casting ingot mould ( 1 ) for liquid metals, especially liquid steel, comprising an ingot mould coolant ( 2 ) which is guided in cooling channels. During the initial temperature rise to achieve a set casting speed or when said casting speed is exceeded for a deviating copper plate skin temperature ( 8 ), the copper plate skin temperature ( 8 ) is influenced, even when the casting speed is higher, in such a way that surface errors in the casting shell and/or cracks in the surface of the copper plates are prevented from occurring or occur in a significantly reduced manner by adjusting the copper plate skin temperature ( 8 ) at alternating casting speeds ( 6 ) of between 1 m/min and a maximum 12 m/min by means of quantitative correction of the amount of ingot mould coolant ( 4 ) and/or ingot mould coolant inflow temperature ( 5 ) according to the casting speed ( 6 ) and according to the thickness of the copper plates ( 9 ), to a desired constant value.

1 . Method of cooling the copper plates ( 1 . 1 ) of a continuous casting ingot mold ( 1 ) for molten metals, especially molten steel, with ingot mold coolant ( 2 ) conveyed in cooling channels and with a copper plate nominal skin temperature ( 8 ) that deviates during the ramping up to the set casting rate or when the set casting rate is exceeded, wherein the copper plate skin temperature ( 8 ) is adjusted at varying casting rates ( 6 ) between 1 m/min and a maximum of 12 m/min by means of a quantitative correction of the amount ( 4 ) of ingot mold coolant and/or the intake temperature ( 5 ) of the ingot mold coolant to a desired, constant value, depending on the present casting rate and depending on the thickness ( 9 ) of the copper plates.  
     
     
         2 . Method in accordance with  claim 1 , wherein the desired, constant copper plate skin temperature ( 8 ) in the region of the liquid metal level is constantly adjusted.  
     
     
         3 . Method in accordance with  claim 1 , wherein the ingot mold coolant ( 2 ) is conveyed through the cooling channels from top to bottom or from bottom to top.  
     
     
         4 . Method in accordance with  claim 1 , wherein the continuous casting ingot mold ( 1 ) is oscillated.  
     
     
         5 . Method in accordance with  claim 1 , wherein the cast strand ( 11 ) is cast together with the flux powder slag ( 10 ) that forms.  
     
     
         6 . Method in accordance with  claim 1 , wherein, to control the amount ( 4 ) of ingot mold coolant and the intake temperature ( 5 ) of the ingot mold coolant, process data and plant data are introduced, which are processed into controlled variables in an online simulation model ( 27 . 4 ).  
     
     
         7 . Method in accordance with  claim 1 , wherein a direct determination of the copper plate skin temperature ( 8 ) in the region of the liquid metal level is used in addition to or alternatively to the online simulation model ( 27 . 4 ).  
     
     
         8 . Device for cooling the copper plates ( 1 . 1 ) of a continuous casting ingot mold ( 1 ), especially for molten steel, with cooling channels through which ingot mold coolant ( 2 ) flows, wherein controlled variables ( 27 . 3 ) are provided for controlling the intake temperature ( 5 ) of the ingot mold coolant and/or the amount ( 4 ) of ingot mold coolant at casting rates ( 6 ) between 1 m/min and a maximum of 12 m/min and at copper plate thicknesses ( 9 ) of 4 mm to about 50 mm.  
     
     
         9 . Device in accordance with  claim 8 , wherein the ingot mold coolant intake ( 3 ) is located some distance above the liquid metal level.  
     
     
         10 . Device in accordance with  claim 8 , wherein the continuous casting ingot mold ( 1 ) is oscillated by an oscillation device.  
     
     
         11 . Device in accordance with  claim 8 , wherein flux powder is supplied to the cast strand ( 11 ) during casting.  
     
     
         12 . Device in accordance with  claim 7 , wherein a process-control computer ( 27 ), which is supplied with process data ( 27 . 1 ) and plant data ( 27 . 2 ) for an online simulation model ( 27 . 4 ) for controlled variables ( 27 . 3 ) for controlling the intake temperature ( 5 ) of the ingot mold coolant and/or the amount ( 4 ) of ingot mold coolant, controls a three-way valve ( 24 ) and a control valve ( 29 ) as well as a speed-controlled pump ( 22 ) in the ingot mold coolant circulation.  
     
     
         13 . Device in accordance with  claim 8 , wherein, in addition to or instead of the process-control computer ( 27 ), a device for determining the copper plate skin temperature ( 8 ) in the region of the liquid metal level is used to control the intake temperature ( 5 ) of the ingot mold coolant and/or the amount ( 4 ) of ingot mold coolant.