Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1975-05-05
1977-09-13
Andrews, M. J.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 60, C21C 700
Patent
active
040479374
ABSTRACT:
A method for controlling the operation of a steel refining converter of the type having bottom tuyeres, each tuyere consisting of a center jet surrounded by annulus jets is disclosed. Controls are provided for blowing oxygen through the center jets and a fuel gas, such as propane, through the annulus jets during the refining step. Purging gases, such as nitrogen and compressed air, are blown through the jets during other parts of the steel making process. By means of switching circuits, the flow of each selected set of gases is established before the previously selected set can be cut off, one set of gases is automatically substituted for another if there is a loss of pressure at the tuyeres, nitrogen is substituted for oxygen and fuel if the flow of either of the latter two gases falls below a predetermined value and tilting of the converter to an upright position is prevented unless there is adequate pressure in the tuyeres. The disclosed method ensures that molten metal will not enter or damage the tuyeres thereby preventing severe damage to the equipment and possible hazards to operating personnel.
REFERENCES:
patent: 3725041 (1973-04-01), Ramachandran
patent: 3843354 (1974-10-01), Nilles et al.
patent: 3920447 (1975-11-01), Schroeder et al.
Kolb William A.
Vignovich Pete
Andrews M. J.
United States Steel Corporation
Urey David S.
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