CONVERTER

Abstract

A converter for the production of steel by a blowing process from a substantially liquid raw material, in particular pig iron, includes several injectors which are dispersed in the sidewall of the converter about the converter inner circumference and directed towards the bath level for refining the pig iron. The injectors are designed as supersonic nozzle, which are surrounded by a ring nozzle forming an enveloping gas jet. The injectors are oriented at an angle of max. 43 in relation to the bath surface, with oxygen being introduced through the supersonic nozzle and a mixture of compressed air and natural gas being introduced through the ring nozzle. The jet pulse for the oxygen jet fed through the supersonic nozzle is dimensioned such that an infiltration of the oxygen jet into the melt bath is ensured.

Claims

1.-6. (canceled)

7. A converter for the production of steel by a blowing process from a substantially liquid raw material, said converter comprising: a vessel having a sidewall; a plurality of injectors dispersed in the sidewall about an inner circumference of the vessel and directed towards a bath level of a melt bath for refining the raw material, said injectors being embodied as supersonic Laval nozzle and oriented at an angle of max. 43 in relation to a bath surface for introducing an oxygen jet of oxygen into an interior of the vessel at supersonic speed which is greater than 1.5 the sound of speed, with a jet pulse for the oxygen jet fed through the supersonic nozzle being dimensioned such that an infiltration of the oxygen jet into the melt bath is ensured; and a ring nozzle surrounding the injectors and forming an enveloping gas jet, said ring nozzle being constructed to introduce a mixture of compressed air and natural gas into the interior of the vessel.

8. The converter of claim 7, wherein the raw material is pig iron.

9. The converter of claim 7, wherein the injectors are configured for a switching over to a burner mode with long flame and an injector mode with a concentrated oxygen jet and high impact impulse.

10. The converter of claim 7, wherein the injectors have an installation height which is up to a maximum of approximately 2 m above the bath surface.

11. The converter of claim 7, wherein the injectors are additionally used for application of an oxygen lance and bottom nozzles.

Description

[0024] The invention shall be explained hereinafter with reference to the drawing.

[0025] The drawing shows schematically the side view and the cross section of a converter.

[0026] In a known manner, the pear-shaped converter vessel 1held by a retaining ring 2is laterally supported, with a tilting drive 3 being integrated into the lateral support. Normally, an oxygen lancenot shown hereis introduced through the upper opening 4 of the converter, through which oxygen lance oxygen required for refining the raw iron melt is introduced.

[0027] According to the invention, this type of introduction of oxygen is now replaced by injectors 5 which are mounted in the sidewall of the converter vessel and dispersed about the circumference, and through which the required oxygen can be introduced into the interior of the converterabove the bath level.