Converter oxygen blowing method and upward blowing lance for converter oxygen

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=Fhs/(0.00465.Dt ), with respect to a oxygen-flow-rate Fhs(Nm /hr) per hole of the Laval nozzle determined...

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Bibliographic Details
Main Authors KIKUCHI YOSHITERU, SUMI IKUHIRO, KAWABATA RYO
Format Patent
LanguageEnglish
Published 25.05.2005
Edition7
Subjects
CHEMISTRY
METALLURGY
METALLURGY OF IRON
PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL
TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
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Summary: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=Fhs/(0.00465.Dt ), with respect to a oxygen-flow-rate Fhs(Nm /hr) per hole of the Laval nozzle determined from the oxygen-flow-rate Fs(Nm /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). De </= 0.23xDt /ä(Pe/Po)<5/7>xÄ1-(Pe/po)<2/7>Ü<1/2>ü
Bibliography:Application Number: CN20018003740