EP2440872A1 - Verfahren zum betrelben eines bodenspülsystems eines bof-konverters - Google Patents
Verfahren zum betrelben eines bodenspülsystems eines bof-konvertersInfo
- Publication number
- EP2440872A1 EP2440872A1 EP10723541A EP10723541A EP2440872A1 EP 2440872 A1 EP2440872 A1 EP 2440872A1 EP 10723541 A EP10723541 A EP 10723541A EP 10723541 A EP10723541 A EP 10723541A EP 2440872 A1 EP2440872 A1 EP 2440872A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gas
- converter
- inert gas
- annular gap
- central tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/34—Blowing through the bath
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/48—Bottoms or tuyéres of converters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- 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
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/16—Making or repairing linings ; Increasing the durability of linings; Breaking away linings
- F27D1/1678—Increasing the durability of linings; Means for protecting
- F27D1/1684—Increasing the durability of linings; Means for protecting by a special coating applied to the lining
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- 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
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- 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
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
- F27D2003/162—Introducing a fluid jet or current into the charge the fluid being an oxidant or a fuel
- F27D2003/163—Introducing a fluid jet or current into the charge the fluid being an oxidant or a fuel the fluid being an oxidant
- F27D2003/164—Oxygen
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- 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
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
- F27D2003/162—Introducing a fluid jet or current into the charge the fluid being an oxidant or a fuel
- F27D2003/165—Introducing a fluid jet or current into the charge the fluid being an oxidant or a fuel the fluid being a fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- 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
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
- F27D2003/166—Introducing a fluid jet or current into the charge the fluid being a treatment gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- 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
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
- F27D2003/167—Introducing a fluid jet or current into the charge the fluid being a neutral gas
Definitions
- the invention relates to a method for operating in a distributed arrangement of a plurality of central tube and an outer tube existing annular gap nozzles having soil flushing system of a BOF converter with inert gas blowing for decarburization of the melt in the converter.
- EP 1 641 946 B1 is in connection with Aufblas vide in the production of alloyed metal melts or when refining pig iron in a converter for supporting soil injection of various energy sources, alloying agents, charring and decarburizing or the like from a central tube and at least one concentric annular channel existing Annular gap nozzles have become known.
- hydrocarbon is blown through the annular gap in all process steps.
- the blowing rate is 0.25 to 3.5 Nm 3 / tx min. And requires large amounts of gas.
- the flushing blocks or blocks consist of a refractory, such as ceramic material.
- the purging blocks or blocks are in turn interspersed with nozzles to introduce the inert gas in the metal melt in the converter.
- the gas flows through the converter nozzles under high pressure and at high speed and enters the molten metal from below in the area of the converter base.
- CONFIRMATION COPY Badzi achieved, which compensates, among other things, temperature differences in the molten bath.
- the nozzles thus operate under harsh conditions, especially at their discharge end, which is permanently in contact with the molten metal. Accordingly, the nozzle is subject to high wear.
- the burn-up or premature wear of the nozzles at their feed end is, according to experience, approximately 0.25 mm per converter charge.
- the refractory material of the purging plug or Spülblockes in the immediate vicinity of the nozzle by the high pressure and the high velocity of the injected gas also wears heavily and thereby washed out concave.
- the durability of the bottom with the purging blocks or blocks and the nozzles is based on the example of a 330t BOF converter in the range of about 4000 melts, whereas the durability of the likewise lined with a refractory material side walls of the converter is about 7000 melts.
- the invention is therefore based on the object to avoid the disadvantages described above and to provide a method by which the durability of the nozzles and the purging plug or block significantly improved and thus the number of melting cycles in the converter is increased.
- the inert gas is at least temporarily injected together with hydrocarbon and together with a through the annular gap between the central tube and the outer tube, reacted with the inert gas or gas mixture of the central tube shell gas, preferably hydrocarbon, wherein the cladding gas cleaved upon contact with the liquid steel is formed and a circular gap surrounding the annular gap, mushroom-shaped, porous steel shell.
- the inert gas preferably argon or nitrogen, and also the hydrocarbon is injected for metallurgical treatment of the molten metal as a core jet according to the invention via the central tube or die in the molten steel, while the shell gas, in addition to hydrocarbon optionally also steam or CO 2 , as an outer ring beam blown.
- the shell gas in addition to hydrocarbon optionally also steam or CO 2 , as an outer ring beam blown.
- the diameter, for example up to 15 cm, and the height, for example up to 4 cm, of the mushroom-shaped, porous and circularly surrounding the nozzle steel shell can be varied.
- the porous iron fungus thus covers, on the one hand, the flushing stone or block in the surrounding area of the nozzles, which prevents wear in the form of leaching of the refractory material.
- the nozzles are protected by the einhausende foreclosure from burning.
- the only used for bath movement nozzle assembly requires only small amounts of gas, which can achieve a blow rate, which is about ⁇ 0.045 Nm 3 / tx min.
- porous iron fungus or steel jacket forms as a batch over the top of the central inert gas nozzle during the solidification of the molten metal and thus should enforce it, advantageously a small amount of oxygen can be temporarily added to the inert gas and thereby the inert gas nozzle or the central tube be burned.
- a further embodiment of the invention provides that each annular gap nozzle is controlled individually and a constant pressure is maintained. Should there be an increase in pressure in spite of the pressure parameters previously set in the control system, whereby both the central tube and the annular gap would become clogged, a changeover to an oxygen or inert gas admixture takes place in the control system until the previously set, constant Target pressure is reached again.
- a further advantage of the method results when the converter is operated with the so-called "slag splashing."
- This is a known method in which the residual slag is retained in the converter after the converter has been cut off Top lance Large quantities of nitrogen are blown into the converter at high pressure and high speed, where the residual slag is sprayed to the side walls and to the bottom of the converter vessel.
- the sprayed slag is allowed to solidify, forming a protective layer for the refractory material in the bottom and sidewalls.
- the inventively designed in a circular manner around the annular gap, porous, also very rough iron fungus increases in this area the surface.
- FIG. 1 is a schematic sectional view of a conventional, known in the art soil purging plug of a BOF converter
- Fig. 2 is a schematic sectional view of a bottom spoiler of a BOF converter according to the invention, which has an annular gap nozzle arrangement for rinsing the molten steel.
- Fig. 1 shows a known in the art soil rinse stone 1 of a BOF converter, not shown here for refining, mixing and / or rinsing a molten steel.
- the floor scavenger 1 a pipe 2 as a nozzle, via which an inert gas 3, for example nitrogen, is blown for bath movement.
- the nozzle / tube 2 is embedded in a monoblock 4, which consists of a refractory material, for example ceramic, which in turn is enclosed by the refractory material 5 of the lining of the converter.
- a nozzle arrangement which consists of an annular pipe nozzle 11 made of the central pipe 2 and an outer pipe 7 enclosing this concentrically with an annular gap 8.
- the nozzle diameter of the central tube 2 does not need to be more than 5 mm and that of the annular gap nozzle 11 not more than 1 mm.
- Inert gas 3 and intermittently hydrocarbon are injected via the central tube 2, while hydrocarbon and / or oxygen are blown through the annular gap 8 of the annular die 11 in a mixture with inert gas as the jacket gas 9.
- the jacket gas 9 meets with the molten steel, the hydrocarbon is split. Since this reaction requires a lot of energy, a solidification of steel in the immediate vicinity 6 of the annular gap nozzle 11 is achieved.
- a mushroom-shaped, porous steel jacket 10 forms in a circle around the annular gap nozzles 11.
- the porous iron fungus or steel jacket 10 prevents, on the one hand, the premature wear of the refractory material of the monobloc 4, since it lies protectively over it, and, on the other hand, a burning of the tubes 2, 7 of the annular gap nozzle 11, since it surrounds them concentrically and thus after foreclosed on the outside.
- the porous iron fungus 10 enforces the central tube 2 of the annular gap nozzle 11, a small amount of oxygen can be added to the inert gas 3. Due to the added amount of oxygen and the associated reaction, the central tube 2 burns freely. For the annular gap 8 can also be driven an inert gas-oxygen mixture, if clogging appears. The oxygen thus serves only to control or form the size of the iron fungus 10.
- an inert gas 3 eg Ar or N 2 , and (Ar + O 2 ) + (N 2 + O 2 ) can be driven.
- the annular gap nozzles 11 of the converter are integrated into a control loop which on the one hand individually controls and regulates each central tube 2 and the annular gap 8 and on the other hand keeps constant the pressure with which the nozzles are acted upon. Should there nevertheless be an increase in pressure above an upper limit, the annular gap 7 and / or the central tube 2 becoming clogged, then the system is driven in the mode "oxygen / inert gas" via the control loop until the desired pressure is reached again.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102009024859 | 2009-06-09 | ||
| DE102010020179A DE102010020179A1 (de) | 2009-06-09 | 2010-05-11 | Verfahren zum Betreiben eines Bodenspülsystems eines BOF-Konverters |
| PCT/EP2010/003411 WO2010142407A1 (de) | 2009-06-09 | 2010-06-08 | Verfahren zum betrelben eines bodenspülsystems eines bof-konverters |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2440872A1 true EP2440872A1 (de) | 2012-04-18 |
| EP2440872B1 EP2440872B1 (de) | 2013-03-20 |
Family
ID=43070009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP10723541A Active EP2440872B1 (de) | 2009-06-09 | 2010-06-08 | Verfahren zum betreiben eines bodenspülsystems eines bof-konverters |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2440872B1 (de) |
| DE (1) | DE102010020179A1 (de) |
| WO (1) | WO2010142407A1 (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103591804B (zh) * | 2013-11-28 | 2015-01-14 | 甘肃维新工程设备有限公司 | 钢结构衬砖设备衬砖的修补方法 |
| CN106500513B (zh) * | 2016-11-01 | 2019-01-15 | 云南冶金新立钛业有限公司 | 熔盐氯化炉和用于熔盐氯化炉的气体喷枪 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3045992A1 (de) * | 1980-12-05 | 1982-07-22 | Metallgesellschaft Ag, 6000 Frankfurt | Verfahren zum einblasen von hochsauerstoffhaltigen gasen in ein ne-metalle enthaltendes schmelzbad |
| JPS5819424A (ja) * | 1981-07-28 | 1983-02-04 | Kawasaki Steel Corp | 転炉の炉底羽口の冷却制御法 |
| US5431709A (en) * | 1993-09-21 | 1995-07-11 | Gas Research Institute | Accretion controlling tuyere |
| AU1912199A (en) * | 1997-12-11 | 1999-06-28 | Quantum Catalytics, L.L.C. | Feed injection device and method for control of accretion |
| AT412349B (de) | 2003-06-25 | 2005-01-25 | Voest Alpine Ind Anlagen | Verfahren zur herstellung einer legierten metallschmelze und erzeugungsanlage hierzu |
-
2010
- 2010-05-11 DE DE102010020179A patent/DE102010020179A1/de not_active Withdrawn
- 2010-06-08 WO PCT/EP2010/003411 patent/WO2010142407A1/de not_active Ceased
- 2010-06-08 EP EP10723541A patent/EP2440872B1/de active Active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2010142407A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2440872B1 (de) | 2013-03-20 |
| WO2010142407A1 (de) | 2010-12-16 |
| DE102010020179A1 (de) | 2010-12-16 |
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