C - Chemistry – Metallurgy – 21 – C
Patent
C - Chemistry, Metallurgy
21
C
C21C 5/32 (2006.01) C21C 5/46 (2006.01)
Patent
CA 2397551
A method for blowing oxygen in a converter uses a top-blown lance having a Laval nozzle installed on its tip. The Laval nozzle has a back pressure of the nozzle Po(kPa) satisfying a formula, Po=Fh s/ (0.00465 .cndot. Dt2), with respect to a oxygen-flow-rate Fh s(Nm3/hr) per hole of the Laval nozzle determined from the oxygen-flow-rate F s(Nm3/hr) in a high carbon region in a peak of decarburization and a throat diameter Dt (mm). An exit diameter De of the Laval nozzle satisfies the following formula with respect to the back pressure of the nozzle Po(kPa), an ambient pressure Pe(kPa), and the throat diameter Dt(mm). De2 ~ 0.23xDt2/{(Pe/Po)5/7x[1-(Pe/Po)2/7]1/2}
L'invention concerne un procédé de soufflage d'oxygène de convertisseur permettant de souffler l'oxygène au moyen d'une lance de soufflage vers le haut dotée d'une buse de Laval fixée à sa pointe. Ladite buse comporte une contre-pression de buse P0 (kPa) satisfaisant à l'exigence d'une expression P0 = Fhs / (0,00465.Dt<2>), dans laquelle une vitesse d'alimentation d'acide pour chaque trou de buse en caoutchouc, déterminée par la vitesse d'alimentation d'acide Fs (Nm<3> / hr) dans la zone de carbone supérieure d'une période crête de décarburation, est Fhs (Nm<3> / hr), le diamètre de gorge étant Dt (mm). Le diamètre de sortie (De) de la buse de Laval satisfait à l'exigence de l'expression De<2></= 0,23 x Dt<2>/ {(Pe/P0)< 5/7 >x [1 ((Pe/P0)< 2/7>]< â>}, la contre pression de buse étant P0 (kPa), la pression atmosphérique Pe (kPa) et le diamètre de gorge Dt (mm).
Akai Shinichi
Kawabata Ryo
Kikuchi Yoshiteru
Kohira Satoshi
Sumi Ikuhiro
Jfe Steel Corporation
Nkk Corporation
Ridout & Maybee Llp
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