Suspended roof for electric arc furnace

An improved liftable roof for an electric furnace and the like that has a mouth ledge portion with respect to which the roof is to be lowered into a closing-off position and lifted into an open position which comprises, an outer fluid-cooled metal roof ring adapted to rest on the ledge portion, an inner metal roof ring in a radially-inwardly spaced relation with respect to said outer ring, a first group of refractory tile members defining a roof skirt positioned between and carried by said inner and outer rings, a second group of refractory tile members defining a central roof part within the confines of said inner ring and having a fume exhaust hole portion and spaced-apart electrode hole portions therein, an overhead metal frame structure connecting said inner and outer rings in a secure relation with respect to each other, a centrally disposed cooling fluid dispersing ductwork carried by said overhead frame structure, said ductwork being positioned to extend about said fume exhaust hole and said electrode hole portions, and said ductwork having means for applying cooling fluid curtains to the central roof part between said hole portions.

An improved liftable roof for an electric furnace and the like having a mouth ledge portion with respect to which the roof is to be lowered into a closing-off position for furnace operation and to be lifted into an open furnace-charging position which comprises, an outer fluid-cooled metal roof ring member adapted to rest on the ledge portion, an inner metal roof ring member in a radially inwardly and upwardly spaced relation with respect to said outer ring member, a first group of refractory tile members defining a roof skirt and positioned between said inner and outer ring members, a second group of refractory tile members defining a central roof part within the confines of said inner ring member, a fluid-cooled and dispersing ductwork positioned along said central roof part and, with said inner ring member, suspending said second group of refractory tile members in a mounted relation therebetween, and said second group of refractory tile members defining a fume exhaust hole portion and electrode hole portions in said central roof part.

An improved liftable roof for an electric furnace and the like that has a mouth ledge portion with respect to which the roof is to be lowered into a closing-off position and lifted into an open position which comprises, an outer fluid-cooled metal roof ring adapted to rest on the ledge, an inner metal roof ring in a radially inwardly spaced relation with respect to said outer ring, an overhead frame structure connecting said inner and outer rings in a secure relation with respect to each other, said frame structure having a pair of horizontally spaced-apart and extending fluid-cooled primary side beam members and a pair of spaced-apart and horizontally extending fluid-cooled end beam members secured in an end-to-end relation with said primary beam members and defining a fluid-cooled substantially rectangular frame therewith, a first group of refractory tile members defining a roof skirt and positioned between and carried by said inner and outer roof rings, a second group of refractory tile members defining a central part of the roof within the confines of said inner ring and having a fume exhaust hole portion and spaced-apart electrode hole portions therein, and said secondary group of tile members being suspended by said overhead frame structure.