초록 ▼

A process for blowing oxygen-containing gas, with and without solid material, on a metal melt in a metallurgical vessel, a process for generating a burner flame and corresponding devices. The inventive process and lance suitable for such process provides, without structural conversion and by a simpl

A process for blowing oxygen-containing gas, with and without solid material, on a metal melt in a metallurgical vessel, a process for generating a burner flame and corresponding devices. The inventive process and lance suitable for such process provides, without structural conversion and by a simple design, various different process steps in the treatment of metal melts in a metallurgical vessel while increasing the insertion rates of the individual media. This is accomplished using a multifunctional lance in which the process of blowing oxygen with and without solids, and the generation of a burner flame may be performed independently from one another. The individual supply lines are connected in a corresponding manner depending on the respective process step. In the process for blowing oxygen-containing gas, vibrations are excited in the gas flow in a relatively simple manner.

대표청구항 ▼

[ What is claimed is:] [1.] A process for blowing oxygen-containing gas on a metal melt in a metallurgical vessel having a free space and generating a burner flame in the free space of the metallurgical vessel, said process comprising the steps of:(a) guiding one of an oxygen and an oxygen-containin

[ What is claimed is:] [1.] A process for blowing oxygen-containing gas on a metal melt in a metallurgical vessel having a free space and generating a burner flame in the free space of the metallurgical vessel, said process comprising the steps of:(a) guiding one of an oxygen and an oxygen-containing gas into a bottom end of an annular flow chamber in a lance having a Laval mouth at a top end of the annular flow chamber directed towards the melt;(b) after a first distance from the bottom end, expanding the gas such that an annular gas flow having a circular cross section progresses through the annular flow chamber from the first distance toward the top end;(c) deflecting a outer circumferential portion the annular gas flow using an annular obstacle positioned at an outer wall in the annular flow chamber between the first distance and the top end thereby generating a deflected gas flow;(d) exciting vibrations in the annular gas flow through impact of the deflected gas flow with the portion of the annular gas flow which continues flowing towards the melt; and(e) discharging from the Laval mouth at supersonic velocity, the annular gas flow downstream beyond the annular obstacle and a critical cross-section of the Laval mouth after said step of exciting vibrations, the critical cross-section being a narrowmost cross-section of the Laval mouth.