Patent
1976-03-31
1977-06-21
Envall, Jr., R. N.
H05B 700
Patent
active
040313085
ABSTRACT:
A direct current electric arc furnace hearth connection of the liquid-solid type is initially installed as a metal billet in an opening in a furnace construction, with water-containing refractory material rammed around the billet. When the material dries and with the furnace in operation, a melt in the furnace, which the billet must contact, with incidental melting of the inner end of the billet, cannot escape around the billet, the outer end of the billet being cooled and remaining solid to form an electrical connection for operation of the furnace. To accelerate drying of the rammed water-containing or moist refractory forming a lining around the billet, a hole is formed through the billet and a gas flame is burned at the hole on the inside end of the billet, while the resulting hot gases are sucked out of the billet's outside end, the flow of hot gases through the length of the billet, heating the billet to dry the rammed refractory material, particularly throughout its portion most adjacent to the furnace, more quickly than can be effected by conduction of heat through a solid billet not having a hole.
REFERENCES:
patent: 3835230 (1974-09-01), Valchev et al.
patent: 3949151 (1976-04-01), Kerton
Fredrickson Bengt
Stenkvist Sven-Einar
ASEA Aktiebolag
Envall, Jr. R. N.
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