# US 8,540,931 B2 · Nozzle for injecting gas containing oxygen into a pig iron device having an injector insertion pipe

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- Number: US 8,540,931 B2
- Document ID: US8540931B2
- Status: Granted
- Kind: B2
- Application number: 13/131,761
- Filed: 2009-11-05
- Published: 2011-12-01
- Granted: 2013-09-24
- Earliest claimed: 2008-11-28
- Assignees: Siemens Vai Metals Technologies GmbH; Siemens Aktiengesellschaft
- Applicants: Georg Aichinger; Franz Berner; Stefan Lechner; Marinko Lekic-Ninic; Jan-Friedemann Plaul; Johannes Leopold Schenk; Martin Schmidt; Thomas Söntgen; Bogdan Vuletic; Kurt Wieder; Johann Wurm
- Inventors: Georg Aichinger; Franz Berner; Stefan Lechner; Marinko Lekic-Ninic; Jan-Friedemann Plaul; Johannes Leopold Schenk; Martin Schmidt; Thomas Söntgen; Bogdan Vuletic; Kurt Wieder; Johann Wurm
- Web page: https://patentgrep.com/patent/US8540931B2

## CPC

- F27D 3/16: Introducing a fluid jet or current into the charge (F27D3/18 takes precedence)
- C21B 7/163: {Blowpipe assembly}
- C21B 13/0013: {introduction of iron oxide into a bath of molten iron containing a carbon reductant}
- C21B 13/143: {Injection of partially reduced ore into a molten bath}
- C21C 5/48: Bottoms or tuyéres of converters
- F27D 2003/164: {Oxygen}
- F27D: DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- C21B: MANUFACTURE OF IRON OR STEEL (preliminary treatment of ferrous ores or scrap C22B1/00)
- C21C: PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS

## Abstract

An injector insert pipe is arranged in the gas channel of a nozzle for injecting oxygen-containing gas into a pig iron production unit, wherein an interspace which surrounds the pipe is present over the entire pipe length between the wall of the gas channel and the pipe outer wall. The pipe extends at least as far as the nozzle end face which contains the mouth of the gas channel. The pipe space is connected to an oxygen-containing gas feed line, and the interspace is connected to a protective gas supply line. In a process, oxygen-containing gas is fed into the pipe space, which after it has flowed through the pipe, enters the production unit at an entry velocity, and the interspace is simultaneously flowed through by a gas which exits into the production unit at an exit velocity, wherein the entry velocity is greater than the exit velocity.

## Claims

### Claim 1

A nozzle for injecting oxygen-containing gas into a pig iron production unit, comprising at least one gas channel, wherein
an injector insert pipe, which can be inserted into the gas channel of the nozzle in exchangeable fashion, is arranged in the gas channel of the nozzle in such a way that an interspace which surrounds the injector insert pipe is present over the entire length of the injector insert pipe between a wall of the gas channel and an outer wall of the injector insert pipe,
the injector insert pipe is provided with spacers which support said pipe, when it has been inserted, on the wall of the gas channel,
the injector insert pipe is produced from refractory material,
the injector insert pipe extends at least as far as an end face of the nozzle which contains a mouth of the gas channel,
a space surrounded by the injector insert pipe is connected to a feed line for oxygen-containing gas, and wherein
an interspace between the wall of the as channel and the outer wall of the injector insert pipe is connected to a supply line for protective gas;
wherein the end face of the nozzle which contains the mouth of the gas channel is provided with one or more insert pieces made from refractory material, wherein an outlet edge of the mouth is completely covered.

### Claim 2 (depends on 1)

The nozzle according to claim 1, wherein the pig iron production unit is a melter gasifier.

### Claim 3 (depends on 1)

The nozzle according to claim 1, wherein the refractory material is aluminum oxide Al2O3, zirconium dioxide ZrO2, magnesium oxide MgO, non-oxidic ceramic fiber composite materials, oxidic ceramic fiber composite materials or high-temperature-resistant steels.

### Claim 4

A nozzle for injecting oxygen-containing gas into a pig iron production unit, comprising at least one gas channel, wherein
an injector insert pipe, which can be inserted into the gas channel of the nozzle in exchangeable fashion, is arranged in the gas channel of the nozzle in such a way that an interspace which surrounds the injector insert pipe is present over the entire length of the injector insert pipe between a wall of the gas channel and an outer wall of the injector insert pipe,
the injector insert pipe is provided with spacers which support said pipe, when it has been inserted, on the wall of the gas channel,
the injector insert pipe is produced from refractory material,
the injector insert pipe extends at least as far as an end face of the nozzle which contains a mouth of the gas channel,
a space surrounded by the injector insert pipe is connected to a feed line for oxygen-containing gas, and wherein
an interspace between the wall of the gas channel and the outer wall of the injector insert pipe is connected to a supply line for protective gas;
wherein the injector insert pipe extends beyond the end face of the nozzle which contains the mouth of the gas channel.

### Claim 5

A nozzle for injecting oxygen-containing gas into a pig iron production unit, comprising at least one gas channel, wherein
an injector insert pipe, which can be inserted into the gas channel of the nozzle in exchangeable fashion, is arranged in the gas channel of the nozzle in such a way that an interspace which surrounds the injector insert pipe is present over the entire length of the injector insert pipe between a wall of the gas channel and an outer wall of the injector insert pipe,
the injector insert pipe is provided with spacers which support said pipe, when it has been inserted, on the wall of the gas channel,
the injector insert pipe is produced from refractory material,
the injector insert pipe extends at least as far as an end face of the nozzle which contains a mouth of the gas channel,
a space surrounded by the injector insert pipe is connected to a feed line for oxygen-containing gas, and wherein
an interspace between the wall of the gas channel and the outer wall of the injector insert pipe is connected to a supply line for protective gas;
wherein the gas channel is provided, in the region of the mouth, with one or more insert pieces which are made from refractory material and extend at least as far as the end face of the nozzle which contains the mouth of the oxygen channel.