Furnaces – With fuel treatment means – Preliminary refuse treatment means
Patent
1975-06-06
1976-06-29
Envall, Jr., R. N.
Furnaces
With fuel treatment means
Preliminary refuse treatment means
13 32, 110 99R, F27D 102
Patent
active
039670481
ABSTRACT:
A dual-ring roof is provided for an electric arc furnace which may be suspended for lift-off and on operation with respect to a receiving mouth ledge portion about a charging opening in the furnace. The rings are radially spaced with respect to each other to define inner and an outer refractory tile receiving areas; they are of structural metal construction and have jacketing for continuous circulation of cooling fluid therealong. An outer, sprung, refractory skirt section is carried in the area between the rings, and the inner ring has an upwardly spaced relation with respect to the outer ring and carries centrally thereof an inner, refractory, sprung section or dome. The inner, central refractory roof section is provided with electrode and fume exhaust hole portions therein. The fume hole portion is enclosing and defined by a fluid-cooled ring through which fluid circulates in tandem with fluid being circulated through the inner roof ring. An overhead structural metal frame ties the inner and outer ring members together and may be utilized in suspending the roof.
REFERENCES:
patent: 2551941 (1951-05-01), Greene
patent: 3385241 (1968-05-01), Alvis et al.
patent: 3756172 (1973-09-01), Brereton et al.
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