Relationship Between Refractory Lining Design & Liquid Steel Temperature at the Ladle Furnace

by Mario Taddeo

Publisher - (ISOMAG) Asia Pacific. Pyrotek Inc. Canada

Category - Engineering & IT

Improving the liquid steel temperature loss of Casting Ladles can significantly reduce costs and increase productivity. This has been achieved by reducing the heat loss of the refractory lining through the use of a dedicated insulating layer. A Thailand steel plant had included a 12.7mm insulation board into its Casting Ladle refractory lining that allowed for both an increase in vessel capacity and reduction in shell temperature.This paper assessed the effect the insulated lining had on reducing; the Ladle shell temperature, liquid steel temperature (between the Electric Arc Furnace to Ladle Furnace) and other efficiencies. In summary the refractory lining incorporating insulation offered the steel plant more efficiencies in the following areas:  Average 30C shell temperature reduction over the whole campaign;  More uniform shell temperature around the ladle, no hot spots, less deformation;  Reduced lining thickness by 20mm for ladle capacity increase;  Less variability in liquid temperature loss for less cold return heats at the Caster, and  Increased Liquid Steel Temperature arriving at the Ladle Furnace from 8 - 30oC  Subsequent Ladle Furnace efficiencies included o From Electric Arc Furnace to Ladle Furnace reduced by 2.2 to 5oC/min o LF Energy consumption reduced from 97-404 kW/heat o LF Energy consumption reduced from 2-6kWh/t o Power on Time reduce from 0.4 – 3 min / heat. Improving the liquid steel temperature loss of Casting Ladles can significantly reduce costs and increase productivity. This has been achieved by reducing the heat loss of the refractory lining through the use of a dedicated insulating layer. A Thailand steel plant had included a 12.7mm insulation board into its Casting Ladle refractory lining that allowed for both an increase in vessel capacity and reduction in shell temperature.This paper assessed the effect the insulated lining had on reducing; the Ladle shell temperature, liquid steel temperature (between the Electric Arc Furnace to Ladle Furnace) and other efficiencies. In summary the refractory lining incorporating insulation offered the steel plant more efficiencies in the following areas:  Average 30C shell temperature reduction over the whole campaign;  More uniform shell temperature around the ladle, no hot spots, less deformation;  Reduced lining thickness by 20mm for ladle capacity increase;  Less variability in liquid temperature loss for less cold return heats at the Caster, and  Increased Liquid Steel Temperature arriving at the Ladle Furnace from 8 - 30oC  Subsequent Ladle Furnace efficiencies included o From Electric Arc Furnace to Ladle Furnace reduced by 2.2 to 5oC/min o LF Energy consumption reduced from 97-404 kW/heat o LF Energy consumption reduced from 2-6kWh/t o Power on Time reduce from 0.4 – 3 min / heat. Improving the liquid steel temperature loss of Casting Ladles can significantly reduce costs and increase productivity. This has been achieved by reducing the heat loss of the refractory lining through the use of a dedicated insulating layer. A Thailand steel plant had included a 12.7mm insulation board into its Casting Ladle refractory lining that allowed for both an increase in vessel capacity and reduction in shell temperature.This paper assessed the effect the insulated lining had on reducing; the Ladle shell temperature, liquid steel temperature (between the Electric Arc Furnace to Ladle Furnace) and other efficiencies. In summary the refractory lining incorporating insulation offered the steel plant more efficiencies in the following areas:  Average 30C shell temperature reduction over the whole campaign;  More uniform shell temperature around the ladle, no hot spots, less deformation;  Reduced lining thickness by 20mm for ladle capacity increase;  Less variability in liquid temperature loss for less cold return heats at the Caster, and  Increased Liquid Steel Temperature arriving at the Ladle Furnace from 8 - 30oC  Subsequent Ladle Furnace efficiencies included o From Electric Arc Furnace to Ladle Furnace reduced by 2.2 to 5oC/min o LF Energy consumption reduced from 97-404 kW/heat o LF Energy consumption reduced from 2-6kWh/t o Power on Time reduce from 0.4 – 3 min / heat.

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