Metallurgical apparatus – Process
Patent
1976-04-27
1978-02-07
Dost, Gerald A.
Metallurgical apparatus
Process
266142, 266158, C21C 540
Patent
active
040722996
ABSTRACT:
The improvement in method and apparatus for basic oxygen steel making employing the off-gas principle for pre-heating purposes. This improvement involves the directing of the off-gas from a first furnace during refining to a second furnace, and burning said off-gas within the second furnace efficiently in order to preheat scrap and/or iron pellets in order to decrease the charge of molten pig iron and increase the solid charge. At the conclusion of the refining portion of the cycle, said first furnace is emptied of its steel and the cold charge is introduced into it while molten pig iron is charged into said second furnace on top of the pre-heated scrap. The cycle is then reversed by refining in said second furnace and directing said off-gas to said first furnace where it is mixed with oxygen or air and burnt within it to provide energy for the pre-heat. The method and apparatus provide for the protection of the lining and gives consideration to maintenance and pollution control. This improvement makes use of the off-gas which is generally wasted and in this manner conserves an appreciable amount of energy.
REFERENCES:
patent: 3434705 (1969-03-01), Pere
patent: 3533612 (1970-10-01), Morton
patent: 3809376 (1974-05-01), Plazier
patent: 3863906 (1975-02-01), Vicard
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