Method for injecting gases into a metallurgical tank

US6432165B1 · kind B1 · utility

Assignee

• SMS DEMAG LLC · DE

Inventors

• Rainer Dittrich · Duisburg, DE
• Horst-Dieter Scholer · Duisburg, DE
• Andreas Ploch · Dinslaken, DE
• Manfred Zeimes · Hilden, DE

Key dates

• Filing date: Aug 15, 2000
• Grant date: Aug 13, 2002
• Expiry date: Aug 15, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21C5/4606
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A blowing lance for treating molten metals which are situated in vacuum-treatment vessels, in particular steel in RH vessels, having a central pipe and an encasing pipe which is arranged coaxially with respect to the central pipe and can be cooled by a cooling medium. The central pipe and the encasing pipe are connected to supply lines, which in turn can be connected to an oxygen station, a fuel-gas station and an inert-gas station and to a solids-feed device. In this lance, the cooled encasing pipe is arranged at a distance from the central pipe over its entire length. The free annular area (AR) between the two pipes satisfying the following statementAR=0.8 to 1.2×AZwhere AZ=free cross-sectional area of the central pipe. The end of the central pipe is designed in the form of a Laval nozzle. The nozzle opening of the central pipe is being arranged at a distance (a) inside the encasing tube,where a=0.5 to 0.8×dwhere d=clear diameter of the central pipe.