Refractory lining of a Basic Oxygen Furnace Mar28

Refractory lining of a Basic Oxygen Furnace...

Refractory lining of a Basic Oxygen Furnace The purpose of a refractory lining in a basic oxygen furnace is to provide maximum furnace availability during operation of the converter in order to meet production requirements and to ensure lowest possible specific refractory consumption. For this it is essential To optimize lining design To optimize lining maintenance practices To have good technological discipline during converter operation Typical refractory lining is shown in the converter cross section in Fig 1.               Fig 1 Refractory lining of a converter with removable bottom (Cross section) Lining design Wear of refractory lining is due to either the individual or the combined effect of the following agents. i)             Corrosion due to chemical attack of slag ii)            Temperature iii)          Oxidizing atmosphere iv)           Impact and Abrasion v)            Mechanical damage during deskulling Due to varying action of these agents there are many wear areas in the converter Theoretically the refractory lining of a converter is to be designed by the refractory type and different thicknesses so that no material is wasted at the end of the converter campaign. These   mean all the zones (Fig 2) of the converter lining is worn out to the stopping thickness at the same time. But in practice this does not happen and the refractories in some zones are worn out faster than the refractories in other zones. A balanced lining design is always aimed to improve lining life at the optimum refractory cost. A balanced lining is the lining where different qualities and thicknesses of refractories are used in different zone of the converter after careful study of the wear pattern of the refractories in the converter. This type of lining is also called zonal lining since in such type of...