EP2285992A1 - Oxygen blowing lance with protection element - Google Patents
Oxygen blowing lance with protection elementInfo
- Publication number
- EP2285992A1 EP2285992A1 EP09765708A EP09765708A EP2285992A1 EP 2285992 A1 EP2285992 A1 EP 2285992A1 EP 09765708 A EP09765708 A EP 09765708A EP 09765708 A EP09765708 A EP 09765708A EP 2285992 A1 EP2285992 A1 EP 2285992A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- oxygen
- lance
- protective element
- blowing lance
- protective
- 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.)
- Withdrawn
Links
- 239000001301 oxygen Substances 0.000 title claims abstract description 119
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 119
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 118
- 238000007664 blowing Methods 0.000 title claims abstract description 52
- 230000001681 protective effect Effects 0.000 claims abstract description 118
- 239000007789 gas Substances 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 7
- 239000011261 inert gas Substances 0.000 claims description 13
- 239000002826 coolant Substances 0.000 claims description 8
- 238000009628 steelmaking Methods 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 abstract description 6
- 230000035515 penetration Effects 0.000 abstract description 6
- 239000010959 steel Substances 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000000919 ceramic Substances 0.000 description 20
- 239000000463 material Substances 0.000 description 11
- 239000000126 substance Substances 0.000 description 9
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 7
- 230000002829 reductive effect Effects 0.000 description 7
- 239000000498 cooling water Substances 0.000 description 6
- 229910010293 ceramic material Inorganic materials 0.000 description 5
- 150000004767 nitrides Chemical class 0.000 description 5
- 239000011224 oxide ceramic Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 229910052574 oxide ceramic Inorganic materials 0.000 description 4
- 230000035882 stress Effects 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910001341 Crude steel Inorganic materials 0.000 description 3
- 229910052581 Si3N4 Inorganic materials 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- -1 for example Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 239000000161 steel melt Substances 0.000 description 3
- FRWYFWZENXDZMU-UHFFFAOYSA-N 2-iodoquinoline Chemical compound C1=CC=CC2=NC(I)=CC=C21 FRWYFWZENXDZMU-UHFFFAOYSA-N 0.000 description 2
- 229910000505 Al2TiO5 Inorganic materials 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910052580 B4C Inorganic materials 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 2
- LTPBRCUWZOMYOC-UHFFFAOYSA-N beryllium oxide Inorganic materials O=[Be] LTPBRCUWZOMYOC-UHFFFAOYSA-N 0.000 description 2
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 239000010431 corundum Substances 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229910052575 non-oxide ceramic Inorganic materials 0.000 description 2
- 239000011225 non-oxide ceramic Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- AABBHSMFGKYLKE-SNAWJCMRSA-N propan-2-yl (e)-but-2-enoate Chemical compound C\C=C\C(=O)OC(C)C AABBHSMFGKYLKE-SNAWJCMRSA-N 0.000 description 2
- 239000011214 refractory ceramic Substances 0.000 description 2
- 239000011226 reinforced ceramic Substances 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 229910052596 spinel Inorganic materials 0.000 description 2
- 239000011029 spinel Substances 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000004408 titanium dioxide Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052756 noble gas Inorganic materials 0.000 description 1
- 150000002835 noble gases Chemical class 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
-
- 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
-
- 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
- C21C5/4606—Lances or injectors
- C21C5/4613—Refractory coated lances; Immersion lances
-
- 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
- C21C5/4606—Lances or injectors
- C21C2005/4626—Means for cooling, e.g. by gases, fluids or liquids
-
- 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
- F27D2003/168—Introducing a fluid jet or current into the charge through a lance
Definitions
- the invention relates to an oxygen blowing lance for steel production with protective element and a method for its operation.
- oxygen is injected into the raw steel melt via oxygen blowing lances in order to freshen them.
- the lance head is exposed to strong thermal, mechanical and chemical stresses during refining, for example by steel and slag spatter, abrasion by slag leaching, and aspirations of hot ambient gases. These loads lead to wear of the lance head, which limits the service life of the lance head.
- the wear of the edges of the oxygen outlet nozzles of the lance head is a factor limiting the service life.
- the shape of the edges is crucial for the depth of penetration of the oxygen stream into the crude steel melt and thus for their penetration as well as the decarburization and tap-to-tap times.
- An oxygen blowing lance for steelmaking with a protective element comprising a lance outer tube and a main oxygen tube disposed within the lance outer tube, between the lance outer tube and
- Oxygen main pipe is formed a gap which is closed lance head side and containing one or more coolant channels, wherein the lanzenkopf solution end of the oxygen blowing lance is provided with the protective element which covers the lance head end of the oxygen blowing lance and is detachably and replaceably attached to the oxygen blowing lance, wherein between the lance-head end of the oxygen blowing lance and the protective element
- This oxygen blowing lance with protective element is characterized in that the lance head end of the main oxygen tube is provided with a cover shell having one or more outlets, wherein at each outlet a Sauerstoffauslassdüse is detachably and interchangeably attached, that in the protective element passages are provided, through which the oxygen outlet nozzles are guided by the shell to the outside, wherein these
- Protective element remains a gap that openings are present in the protective element, and that at least one opening into the space between the lance head end of the oxygen blowing lance and the protective element protective gas line is present.
- the lance head end of the main oxygen tube is provided with a cover shell which covers the entire cross-sectional area of the end.
- the cover has one or more outlets through which in the main oxygen tube delivered oxygen can flow out.
- an oxygen outlet nozzle is detachably and interchangeably attached, for example by means of a high temperature resistant adhesive.
- a removable and exchangeable type of fastening is understood to be a type of fastening in which a first component can be detached from a second component without destruction of the second component, and the second component is ready for receiving a further first component after the connection to the first component has been released ,
- the attachment by means of a quick-change device, such as screw thread, bayonet, connector, whereby the time required for the replacement of worn oxygen outlet nozzles working time is reduced.
- a quick-change device such as screw thread, bayonet, connector
- the oxygen outlet nozzles are designed as Laval nozzles. This ensures a high speed and large expansion of the oxygen at the exit from the oxygen outlet nozzles, whereby good penetration of the crude steel melt and cooling of the oxygen outlet are achieved.
- the oxygen outlet nozzles are made of a material that is resistant to thermal, mechanical and chemical wear under operating conditions, such as stainless steel, ceramic coated stainless steel, high temperature ceramic, oxide ceramics, nonoxide ceramics such as nitride ceramics and carbide ceramics, fiber reinforced ceramic materials such as ceramic sheet, corundum MuMt ceramics, refractory ceramics, carbide ceramics, or graphite.
- Nitride ceramics include aluminum nitride, boron nitride, silicon nitride, silicon aluminum oxynitride, titanium nitride.
- Carbide ceramics are, for example, silicon carbide or boron carbide.
- Oxide ceramics for example, ceramic materials based on titanium dioxide with or without other oxides, or high alumina ceramic materials, or beryllium oxide, magnesia, zirconia, aluminum titanate, spinel, muMt, or titania ceramic materials.
- the oxygen outlet nozzles consist of a carrier coated with such material, which itself is made of a different material.
- the lance head end of the oxygen blowing lance is provided with a protective element.
- This protective element covers the entire cross-sectional area of the lance head end of the oxygen blowing lance.
- the protective element protects the lance head end of the oxygen blowing lance from wear and thermal stress. It is removable and replaceable attached to the oxygen blowing lance, for example by means of a high temperature resistant adhesive. In the present case, this means that a protective element of the oxygen blowing lance without
- Sauerstoffblaslanze Destruction of Sauerstoffblaslanze can be solved, and the Sauerstoffblaslanze after the solution of the connection to the protective element is ready to receive a protective element.
- a fastening is achieved that a worn protective element can be replaced without much effort against a fresh protective element without damaging the oxygen blowing lance.
- the protective element itself can be destroyed when disconnecting.
- the attachment by means of a quick-change device, such as screw thread, bayonet, plug connection, whereby the time required for the exchange of worn protective elements working time is reduced.
- a quick-change device such as screw thread, bayonet, plug connection
- the protective element contains at least one protective body of a material that is resistant to temperature and temperature changes, oxidation and corrosion by gases, liquids, solids under the conditions prevailing in the oxygen blowing process.
- a material that is resistant to temperature and temperature changes, oxidation and corrosion by gases, liquids, solids under the conditions prevailing in the oxygen blowing process.
- it is a refractory material, which withstands temperatures up to 2000 ° C. or higher without material failure.
- the material is material that withstands temperatures up to 2000 ° C. temperature change up to 25,000 K / min without material failure. In this way, mechanical, thermal and chemical wear of the Protective element during operation reduced.
- the material has a low density to minimize the weight of the protective element.
- Preferred materials are high-temperature-resistant ceramics such as oxide ceramics, non-oxide ceramics such as nitride ceramics and carbide ceramics, fiber-reinforced ceramics such as ceramic sheet, corundum MuIMt ceramics, refractory ceramics, carbide ceramics, or graphite.
- Nitride ceramics include aluminum nitride, boron nitride, silicon nitride, silicon aluminum oxynitride, titanium nitride.
- Carbide ceramics are, for example, silicon carbide or boron carbide.
- Oxide ceramics may be, for example, ceramics based on titanium dioxide with or without other oxides, or high alumina ceramics, or beryllium oxide, magnesia, zirconia, aluminum titanate, spinel, muMt, or titanium oxide ceramic materials.
- the protective element may consist of a protective body which can be fastened detachably and exchangeably to the oxygen blowing lance.
- the protective element can consist of a support structure carrying one or more protective bodies, wherein the protective element can be fastened to the oxygen blowing lance in a detachable and replaceable manner via the support structure or protective body.
- the use of a support structure facilitates the manufacture of a protective element of a desired shape. If the protective element is connected to the oxygen lance via the carrier structure, the mechanical load on the protective bodies is reduced, since they do not have to carry their own weight.
- the protective element is designed shell-shaped, that is to say it has a base surface surrounded by side walls.
- the protective element has the shape of a shell, the side walls of stacked rings and their base consists of a plate.
- Such an embodiment is easier to make than a one piece shell.
- it offers the advantage that damage to a ring is less likely to propagate to adjacent regions of the protective element than to a shell made in one piece.
- the protective element passages are provided, through which the oxygen outlet nozzles are guided from the shell to the outside.
- the passages are dimensioned so that a gap remains between the oxygen outlet nozzle and the protective element.
- openings are present in the protective element, which pass through the protective element. Through these openings, the gap between the protective element and lanzenkopf wornem end of the oxygen blowing lance is connected to the space surrounding the Sauerstoffblaslanze.
- inert gas can through the gaps between
- the inert gas line is at least partially guided within the gap between the lance outer tube and the main oxygen tube. As a result, it is protected by the lance outer tube against mechanical, thermal and chemical stress and wear.
- the inventive method for operating the oxygen blowing lance according to the invention for steel production with protective element is characterized in that inert gas from the inert gas introduced into the space between cover and protective element and out of this space through the gaps between Sauerstoffauslassdüsen and protective element and through the openings in the protective element to the outside becomes.
- inert gas any chemically inert gas can be used, for example nitrogen or noble gases. Preference is given to the use of argon, nitrogen, helium.
- the protective gas flowing out of the openings and gaps protects both the protective element and the oxygen outlet nozzles against thermal, chemical and mechanical stress and reduces their wear. These outward shielding gas flows prevent hot ambient gases and entrained particles from entering the outer surface of the protective element and inhibiting heat transfer, mechanical and chemical attack on the protective element.
- the term outside is to be understood as meaning the molten steel facing side of the protective element. Since the protective gas surrounds the material of the protective element with a chemically inert gas layer, it is possible for protective element or protective body to use materials which, owing to their sensitivity to oxidation, would not be usable under the conditions prevailing in steelmaking. Therefore, for example, the good properties of nitride and carbide ceramics such as silicon nitride, or of graphite with respect to resistance to temperature, temperature changes, as well as chemical and mechanical attacks for protective element or protective body can be exploited.
- Protective gas flows that sweep over the surface of the protective element, blow away adhering crude steel and slag splashes from the surface. As a result, wear caused by such adhesions is reduced.
- the protective gas flow dissipates heat from the protective element and oxygen outlet nozzles and thereby cools.
- the gap between the lance outer tube and the main oxygen tube containing the coolant channels is closed on the lance head, so the coolant channels are not continued in the protective element. Therefore, the risk of leakage caused by wear of the protective element is reduced.
- Fig. 1 shows a longitudinal section through the lance head end portion of an operating oxygen blowing lance according to the invention with protective element.
- Fig. 2 shows an oblique view of the lance head end portion of an oxygen blowing lance according to the invention with protective element.
- the 1 shows an oxygen blowing lance 1, whose lance head end is provided with a protective element consisting of a protective body 2 and a support structure 3. Between the lance outer tube 4 and the main oxygen tube 5, a gap 6 is formed, which is closed lance head side. This gap 6 is subdivided by a separating tube 7 into two coolant channels 8a and 8b, which are connected to one another by lances in the separating tube 7. The connection of the coolant channels 8a and 8b with a cooling water supply and cooling water drainage is not shown. The flow through the coolant channels 8a and 8b with cooling water reduces the thermal load on the oxygen blowing lance during operation.
- the lance head end of the main oxygen tube 5 is provided with a cover shell 9 which covers the entire end of the oxygen main tube 5.
- the cover shell has a plurality of outlets 10a and 10b and 10c, in each of which a Sauerstoffauslassdüse 11 is screwed.
- the protective element covers the lance-head end of the oxygen blowing lance 1.
- the protective element is attached to the oxygen lance via the support structure 3 by means of a quick-change closure.
- the oxygen outlet nozzles 11 are guided through passages in the protective body 2 to the outside. Between the Sauerstoffauslassdüsen 11 and the protective body 2 remains while a gap.
- the protective body 2 is penetrated by openings 12. Between the protective body 2 and the lance head end of the oxygen blowing lance 1, a gap 13 is present.
- this space 13 opens a protective gas line 14, which within the gap 6 between the lance outer tube and Oxygen main pipe leads to the gap 13.
- oxygen shown by straight arrows flows out of the main oxygen tube 4 through the outlets 10 and the oxygen outlet nozzles 11 to the outside.
- inert gas represented by corrugated arrows flows from the protective gas line 14 into the intermediate space 13.
- the protective gas flows through the gaps between the oxygen outlet nozzles 11 and the protective body 2 to the outside.
- the oxygen flow emerging from the oxygen outlet nozzles 11 is enveloped by the outflowing protective gas.
- the protective gas flows out of the intermediate space 13 through the openings 12 to the outside and, after emerging from these openings, sweeps over the surface of the protective body 2.
- Fig. 2 shows the lance outer tube 4 and the adjoining protective body 2 of the protective element.
- the side walls of the cup-shaped protective body 2 consist of rings 15 stacked on one another, the base of a plate 16.
- Oxygen outlet nozzles 11 are led through passages in the protective body 2 to the outside, a gap each remaining between the oxygen outlet nozzle and the protective body 2.
- the protective body 2 has openings 12.
- a protective gas line 14, which extends partially outside the oxygen blowing lance, is guided through an insertion opening 17 into the gap between the lance outer tube 4 and the main oxygen tube.
- the oxygen blowing lance with protective element offers the advantage that the protective element and the oxygen outlet nozzles are protected by the protective gas from mechanical, thermal and chemical stress and wear and thus need to be replaced less frequently. If an exchange is necessary, both the protective element and the oxygen outlet nozzles can be replaced by quick-change closures without any effort by fresh components. LIST OF REFERENCES:
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Furnace Charging Or Discharging (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
Description
Sauerstoffblaslanze mit Schutzelement Oxygen blowing lance with protective element
Die Erfindung betrifft eine Sauerstoffblaslanze zur Stahlerzeugung mit Schutzelement sowie ein Verfahren zu ihrem Betrieb.The invention relates to an oxygen blowing lance for steel production with protective element and a method for its operation.
Hintergrund der ErfindungBackground of the invention
In Konvertern zur Stahlerzeugung wird Sauerstoff über Sauerstoffblaslanzen in die Rohstahlschmelze eingeblasen, um diese zu frischen. Das in den Konverter ragende Ende der Sauerstoffblaslanze, aus dem der Sauerstoff ausströmt, wird als Lanzenkopf bezeichnet. Der Lanzenkopf ist beim Frischen starken thermischen, mechanischen und chemischen Belastungen ausgesetzt, beispielsweise durch Stahl- und Schlackespritzer, Abrasion durch Schlacken-Auswaschungen, und Ansaugungen von heißen Umgebungsgasen. Diese Belastungen führen zu Verschleiß des Lanzenkopfes, was die Einsatzzeit des Lanzenkopfes begrenzt. Besonders der Verschleiß der Kanten der Sauerstoffauslassdüsen des Lanzenkopfes ist ein die Einsatzzeit begrenzender Faktor. Die Form der Kanten ist entscheidend für die Eindringtiefe des Sauerstoffstromes in die Rohstahlschmelze und somit für deren Durchdringung sowie die Entkohlungs- und Tap-to-tap-Zeiten.In converters for steelmaking, oxygen is injected into the raw steel melt via oxygen blowing lances in order to freshen them. The end of the oxygen blowing lance protruding into the converter, from which the oxygen flows out, is called a lance head. The lance head is exposed to strong thermal, mechanical and chemical stresses during refining, for example by steel and slag spatter, abrasion by slag leaching, and aspirations of hot ambient gases. These loads lead to wear of the lance head, which limits the service life of the lance head. In particular, the wear of the edges of the oxygen outlet nozzles of the lance head is a factor limiting the service life. The shape of the edges is crucial for the depth of penetration of the oxygen stream into the crude steel melt and thus for their penetration as well as the decarburization and tap-to-tap times.
Aus DE3122178A1 ist es bekannt, den Lanzenkopf aus Kupfer zu fertigen und am stählernen Rohrkörper der Sauerstoffblaslanze anzuschweißen, und durch Kühlwasserkanäle in seinem Inneren, die mit dem Kühlwasserkreislauf des Rohrkörpers verbunden sind, zu kühlen. Eine Schutzkappe aus hitzebeständigem Material bedeckt den Lanzenkopf und kann bei Bedarf unabhängig vom kupfernen Lanzenkopf ausgetauscht werden. Bei einer derartigen Konstruktion müssen die Schweißnähte zwischen Blaslanzenkörper und Lanzenkopf aufwändig geprüft werden. Durch Verschleiß des Lanzenkopfes beziehungsweise der Schutzkappe hervorgerufene Leckagen im kühlwasserdurchströmten Lanzenkopf oder an den Schweißnähten bergen das Risiko von für Mensch und Stahlwerkseinrichtungen gefährlichen Wassereinbrüchen in den Konverter. Oftmaliger Austausch der Schutzkappe verursacht Arbeitsaufwand und vermindert die Verfügbarkeit der Sauerstoffblaslanze. Aufgabe der ErfindungFrom DE3122178A1 it is known to manufacture the lance head from copper and weld it to the steel tube body of the oxygen blowing lance, and to cool it by cooling water channels in its interior, which are connected to the cooling water circuit of the tubular body. A protective cap made of heat-resistant material covers the lance head and can be replaced if necessary independently of the copper lance head. In such a construction, the welds between Blas lanzenkörper and lance head must be checked consuming. Leakage caused by wear of the lance head or protective cap in the lance head flowing through the cooling water or at the weld seams carries the risk of water ingress into the converter which is dangerous for man and steelwork facilities. Frequent replacement of the cap causes labor and reduces the availability of the oxygen blowing lance. Object of the invention
Es ist die Aufgabe der vorliegenden Erfindung, eine wenig verschleißanfällige und betriebssichere Sauerstoffblaslanze zur Stahlerzeugung, sowie ein Verfahren zu ihrem Betrieb bereitzustellen.It is the object of the present invention to provide a less susceptible to wear and more reliable oxygen blowing lance for steelmaking, as well as a method for its operation.
Beschreibung der ErfindungDescription of the invention
Diese Aufgabe wird erfindungsgemäß gelöst durch eineThis object is achieved by a
Sauerstoffblaslanze zur Stahlerzeugung mit Schutzelement, umfassend ein Lanzenaußenrohr und ein innerhalb des Lanzenaußenrohres angeordnetes Sauerstoffhauptrohr, wobei zwischen dem Lanzenaußenrohr undAn oxygen blowing lance for steelmaking with a protective element, comprising a lance outer tube and a main oxygen tube disposed within the lance outer tube, between the lance outer tube and
Sauerstoffhauptrohr ein Spalt ausgebildet ist, der lanzenkopfseitig geschlossen ist und einen oder mehrere Kühlmittelkanäle enthält, wobei das lanzenkopfseitigen Ende der Sauerstoffblaslanze mit dem Schutzelement versehen ist, welches das lanzenkopfseitige Ende der Sauerstoffblaslanze bedeckt und ablös- und austauschbar an der Sauerstoffblaslanze befestigt ist, wobei zwischen dem lanzenkopfseitigen Ende der Sauerstoffblaslanze und dem Schutzelement einOxygen main pipe is formed a gap which is closed lance head side and containing one or more coolant channels, wherein the lanzenkopfseitigen end of the oxygen blowing lance is provided with the protective element which covers the lance head end of the oxygen blowing lance and is detachably and replaceably attached to the oxygen blowing lance, wherein between the lance-head end of the oxygen blowing lance and the protective element
Zwischenraum vorhanden ist.Interspace is present.
Diese Sauerstoffblaslanze mit Schutzelement ist dadurch gekennzeichnet, dass das lanzenkopfseitige Ende des Sauerstoffhauptrohres mit einer Abdeckschale versehen ist, welche einen oder mehrere Auslässe aufweist, wobei an jedem Auslass eine Sauerstoffauslassdüse ablös- und austauschbar befestigt ist, dass in dem Schutzelement Durchlässe vorhanden sind, durch welche die Sauerstoffauslassdüsen von der Schale nach außen geführt sind, wobei dieseThis oxygen blowing lance with protective element is characterized in that the lance head end of the main oxygen tube is provided with a cover shell having one or more outlets, wherein at each outlet a Sauerstoffauslassdüse is detachably and interchangeably attached, that in the protective element passages are provided, through which the oxygen outlet nozzles are guided by the shell to the outside, wherein these
Durchlässe jeweils so dimensioniert sind, dass zwischen Sauerstoffauslassdüse undPassages are each dimensioned so that between Sauerstoffauslassdüse and
Schutzelement ein Spalt verbleibt, dass in dem Schutzelement Öffnungen vorhanden sind, und dass mindestens eine in den Zwischenraum zwischen dem lanzenkopfseitigen Ende der Sauerstoffblaslanze und dem Schutzelement mündende Schutzgasleitung vorhanden ist.Protective element remains a gap that openings are present in the protective element, and that at least one opening into the space between the lance head end of the oxygen blowing lance and the protective element protective gas line is present.
Das lanzenkopfseitige Ende des Sauerstoffhauptrohres ist mit einer Abdeckschale versehen, welche die gesamte Querschnittsfläche des Endes bedeckt. Die Abdeckschale besitzt einen oder mehrere Auslässe, durch die im Sauerstoffhauptrohr angelieferter Sauerstoff ausströmen kann. An jedem dieser Auslässe ist eine Sauerstoffauslassdüse ablös- und austauschbar befestigt, beispielsweise mittels eines hochtemperaturbeständigen Klebstoffes. Unter einer ablös- und austauschbaren Befestigungsart wird eine Befestigungsart verstanden, bei der ein erster Bauteil von einem zweiten Bauteil ohne Zerstörung des zweiten Bauteiles gelöst werden kann, und das zweite Bauteil nach Lösung der Verbindung zum ersten Bauteil wieder bereit ist zur Aufnahme eines weiteren ersten Bauteiles.The lance head end of the main oxygen tube is provided with a cover shell which covers the entire cross-sectional area of the end. The cover has one or more outlets through which in the main oxygen tube delivered oxygen can flow out. At each of these outlets, an oxygen outlet nozzle is detachably and interchangeably attached, for example by means of a high temperature resistant adhesive. A removable and exchangeable type of fastening is understood to be a type of fastening in which a first component can be detached from a second component without destruction of the second component, and the second component is ready for receiving a further first component after the connection to the first component has been released ,
Im vorliegenden Fall bedeutet das, dass eine Sauerstoffauslassdüse vom Auslass der Abdeckschale ohne Zerstörung des Auslasses gelöst werden kann, und der Auslass nach der Lösung der Verbindung zur Sauerstoffauslassdüse wieder bereit ist zurIn the present case, this means that an oxygen outlet nozzle can be released from the outlet of the cover shell without destroying the outlet, and the outlet after the solution of the connection to the oxygen outlet is again ready for
Aufnahme einer Sauerstoffauslassdüse. Die Sauerstoffauslassdüse selbst kann beim Lösen der Verbindung zerstört werden. Durch eine solche Befestigungsart wird erreicht, dass eine verschlissene Sauerstoffauslassdüse gegen eine frische Sauerstoffauslassdüse ausgetauscht werden kann, ohne die Abdeckschale beziehungsweise deren Auslässe zu beschädigen.Intake of an oxygen outlet nozzle. The oxygen outlet nozzle itself can be destroyed when disconnecting. Such a method of attachment ensures that a worn oxygen outlet nozzle can be exchanged for a fresh oxygen outlet nozzle without damaging the cover shell or its outlets.
Vorzugsweise erfolgt die Befestigung mittels einer Schnellwechseleinrichtung, beispielsweise Schraubgewinde, Bajonettverschluss, Steckverbindung, wodurch die für den Austausch verschlissener Sauerstoffauslassdüsen notwendige Arbeitszeit vermindert wird.Preferably, the attachment by means of a quick-change device, such as screw thread, bayonet, connector, whereby the time required for the replacement of worn oxygen outlet nozzles working time is reduced.
Nach einer bevorzugten Ausführungsform sind die Sauerstoffauslassdüsen als Laval- Düsen ausgebildet. Damit wird eine hohe Geschwindigkeit und große Expansion des Sauerstoffs beim Austritt aus den Sauerstoffauslassdüsen gewährleistet, wodurch gute Durchdringung der Rohstahlschmelze sowie Kühlung der Sauerstoffauslassdüse erzielt werden.According to a preferred embodiment, the oxygen outlet nozzles are designed as Laval nozzles. This ensures a high speed and large expansion of the oxygen at the exit from the oxygen outlet nozzles, whereby good penetration of the crude steel melt and cooling of the oxygen outlet are achieved.
Nach einer Ausführungsform bestehen die Sauerstoffauslassdüsen aus einem unter Betriebsbedingungen gegen thermischen, mechanischen und chemischen Verschleiß beständigem Material, beispielsweise rostfreiem Stahl, rostfreiem Stahl mit keramischer Beschichtung, hochtemperaturbeständiger Keramik, Oxidkeramik, Nichtoxidkeramik wie beispielsweise Nitridkeramik und Carbidkeramik, faserverstärkte Keramikwerkstoffe wie beispielsweise Keramikblech, Korund- MuIMt- Keramiken, Feuerfest-Keramiken, Carbid-Keramiken, oder Graphit. Nitridkeramiken sind beispielsweise Aluminiumnitrid, Bornitrid, Siliziumnitrid, Siliziumaluminiumoxidnitrid, Titannitrid. Carbidkeramiken sind beispielsweise Siliziumcarbid oder Borcarbid. Oxidkeramiken können beispielsweise Keramikwerkstoffe auf Basis von Titandioxid mit oder ohne andere Oxide sein, oder Keramikwerkstoffe mit hohem Aluminiumoxidgehalt, oder Keramikwerkstoffe auf Basis von Berylliumoxid, von Magnesiumoxid, von Zirkoniumoxid, von Aluminiumtitanat, von Spinell, von MuIMt, oder von Titanoxid.In one embodiment, the oxygen outlet nozzles are made of a material that is resistant to thermal, mechanical and chemical wear under operating conditions, such as stainless steel, ceramic coated stainless steel, high temperature ceramic, oxide ceramics, nonoxide ceramics such as nitride ceramics and carbide ceramics, fiber reinforced ceramic materials such as ceramic sheet, corundum MuMt ceramics, refractory ceramics, carbide ceramics, or graphite. Nitride ceramics include aluminum nitride, boron nitride, silicon nitride, silicon aluminum oxynitride, titanium nitride. Carbide ceramics are, for example, silicon carbide or boron carbide. Oxide ceramics, for example, ceramic materials based on titanium dioxide with or without other oxides, or high alumina ceramic materials, or beryllium oxide, magnesia, zirconia, aluminum titanate, spinel, muMt, or titania ceramic materials.
Nach einer anderen Ausführungsform bestehen die Sauerstoffauslassdüsen aus einem mit derartigem Material beschichteten Träger, der selbst aus einem anderen Material gefertigt ist.According to another embodiment, the oxygen outlet nozzles consist of a carrier coated with such material, which itself is made of a different material.
Das lanzenkopfseitige Ende der Sauerstoffblaslanze ist mit einem Schutzelement versehen. Dieses Schutzelement bedeckt die gesamte Querschnittsfläche des lanzenkopfseitigen Endes der Sauerstoffblaslanze. Das Schutzelement schützt das lanzenkopfseitige Ende der Sauerstoffblaslanze vor Verschleiß und thermischer Belastung. Es ist ablös- und auswechselbar an der Sauerstoffblaslanze befestigt, beispielsweise mittels eines hochtemperaturbeständigen Klebstoffes. Im vorliegenden Fall bedeutet das, dass ein Schutzelement von der Sauerstoffblaslanze ohneThe lance head end of the oxygen blowing lance is provided with a protective element. This protective element covers the entire cross-sectional area of the lance head end of the oxygen blowing lance. The protective element protects the lance head end of the oxygen blowing lance from wear and thermal stress. It is removable and replaceable attached to the oxygen blowing lance, for example by means of a high temperature resistant adhesive. In the present case, this means that a protective element of the oxygen blowing lance without
Zerstörung der Sauerstoffblaslanze gelöst werden kann, und die Sauerstoffblaslanze nach der Lösung der Verbindung zum Schutzelement wieder bereit ist zur Aufnahme einer Schutzelementes. Durch eine solche Befestigungsart wird erreicht, dass ein verschlissenes Schutzelement ohne großen Aufwand gegen ein frisches Schutzelement ausgetauscht werden kann, ohne die Sauerstoffblaslanze zu beschädigen. Das Schutzelement selbst kann beim Lösen der Verbindung zerstört werden.Destruction of Sauerstoffblaslanze can be solved, and the Sauerstoffblaslanze after the solution of the connection to the protective element is ready to receive a protective element. By such a fastening is achieved that a worn protective element can be replaced without much effort against a fresh protective element without damaging the oxygen blowing lance. The protective element itself can be destroyed when disconnecting.
Vorzugsweise erfolgt die Befestigung mittels einer Schnellwechseleinrichtung, beispielsweise Schraubgewinde, Bajonettverschluss, Steckverbindung, wodurch die für den Austausch verschlissener Schutzelemente notwendige Arbeitszeit vermindert wird.Preferably, the attachment by means of a quick-change device, such as screw thread, bayonet, plug connection, whereby the time required for the exchange of worn protective elements working time is reduced.
Das Schutzelement enthält mindestens einen Schutzkörper aus einem Material, das unter den beim Sauerstoffblasprozess herrschenden Bedingungen beständig ist gegen Temperatur und Temperaturwechsel, Oxidation und Korrosion durch Gase, Flüssigkeiten, Feststoffe. Beispielsweise handelt es sich um ein Feuerfestmaterial, welches Temperaturen bis 20000C oder höher ohne Materialversagen aushält.The protective element contains at least one protective body of a material that is resistant to temperature and temperature changes, oxidation and corrosion by gases, liquids, solids under the conditions prevailing in the oxygen blowing process. For example, it is a refractory material, which withstands temperatures up to 2000 ° C. or higher without material failure.
Beispielsweise handelt es sich um Material, welches bei Temperaturen bis 20000C Temperaturwechsel bis zu 25.000 K/min ohne Materialversagen aushält. Auf diese Weise wird mechanisch, thermisch und chemisch bedingter Verschleiß des Schutzelementes beim Betrieb vermindert. Vorteilhafterweise besitzt das Material eine geringe Dichte, um das Gewicht des Schutzelementes zu minimieren.For example, it is material that withstands temperatures up to 2000 ° C. temperature change up to 25,000 K / min without material failure. In this way, mechanical, thermal and chemical wear of the Protective element during operation reduced. Advantageously, the material has a low density to minimize the weight of the protective element.
Bevorzugte Materialien sind hochtemperaturbeständige Keramiken wie beispielsweise Oxidkeramik, Nichtoxidkeramik wie beispielsweise Nitridkeramik und Carbidkeramik, faserverstärkte Keramikwerkstoffe wie beispielsweise Keramikblech, Korund- MuIMt- Keramiken, Feuerfest-Keramiken, Carbid-Keramiken, oder Graphit. Nitridkeramiken sind beispielsweise Aluminiumnitrid, Bornitrid, Siliziumnitrid, Siliziumaluminiumoxidnitrid, Titannitrid. Carbidkeramiken sind beispielsweise Siliziumcarbid oder Borcarbid. Oxidkeramiken können beispielsweise Keramikwerkstoffe auf Basis von Titandioxid mit oder ohne anderen Oxide sein, oder Keramikwerkstoffe mit hohem Aluminiumoxidgehalt, oder Keramikwerkstoffe auf Basis von Berylliumoxid, von Magnesiumoxid, von Zirkoniumoxid, von Aluminiumtitanat, von Spinell, von MuIMt, oder vonTitanoxid.Preferred materials are high-temperature-resistant ceramics such as oxide ceramics, non-oxide ceramics such as nitride ceramics and carbide ceramics, fiber-reinforced ceramics such as ceramic sheet, corundum MuIMt ceramics, refractory ceramics, carbide ceramics, or graphite. Nitride ceramics include aluminum nitride, boron nitride, silicon nitride, silicon aluminum oxynitride, titanium nitride. Carbide ceramics are, for example, silicon carbide or boron carbide. Oxide ceramics may be, for example, ceramics based on titanium dioxide with or without other oxides, or high alumina ceramics, or beryllium oxide, magnesia, zirconia, aluminum titanate, spinel, muMt, or titanium oxide ceramic materials.
Nach einer Ausführungsform kann das Schutzelement aus einem Schutzkörper bestehen, der ablös- und auswechselbar an der Sauerstoffblaslanze befestigbar ist. Nach einer anderen Ausführungsform kann das Schutzelement aus einer einen oder mehrere Schutzkörper tragenden Trägerkonstruktion bestehen, wobei das Schutzelement über die Trägerkonstruktion oder Schutzkörper ablös- und auswechselbar an der Sauerstoffblaslanze befestigbar ist. Die Verwendung einer Trägerkonstruktion erleichtert die Herstellung eines Schutzelementes einer gewünschten Form. Wenn das Schutzelement über die Trägerkonstruktion mit der Sauerstofflanze verbunden ist, wird die mechanische Belastung der Schutzkörper reduziert, da diese nicht ihr Eigengewicht tragen müssen.According to one embodiment, the protective element may consist of a protective body which can be fastened detachably and exchangeably to the oxygen blowing lance. According to another embodiment, the protective element can consist of a support structure carrying one or more protective bodies, wherein the protective element can be fastened to the oxygen blowing lance in a detachable and replaceable manner via the support structure or protective body. The use of a support structure facilitates the manufacture of a protective element of a desired shape. If the protective element is connected to the oxygen lance via the carrier structure, the mechanical load on the protective bodies is reduced, since they do not have to carry their own weight.
Nach einer Ausführungsform ist das Schutzelement schalenförmig ausgeführt, dass heißt, es hat eine von Seitenwänden umgebene Grundfläche. Nach einer bevorzugten Ausführungsform hat das Schutzelement die Form einer Schale, deren Seitenwände aus aufeinandergestapelten Ringen und deren Grundfläche aus einer Platte besteht. Eine derartige Ausführungsform ist einfacher anzufertigen als eine aus einem Stück gefertigte Schale. Zusätzlich bietet sie den Vorteil, dass eine Beschädigung eines Ringes sich weniger leicht in benachbarte Regionen des Schutzelementes ausbreitet als bei einer aus einem Stück gefertigten Schale. Zwischen dem Schutzelement und dem lanzenkopfseitigen Ende der Sauerstoffblaslanze ist ein Zwischenraum vorhanden.According to one embodiment, the protective element is designed shell-shaped, that is to say it has a base surface surrounded by side walls. According to a preferred embodiment, the protective element has the shape of a shell, the side walls of stacked rings and their base consists of a plate. Such an embodiment is easier to make than a one piece shell. In addition, it offers the advantage that damage to a ring is less likely to propagate to adjacent regions of the protective element than to a shell made in one piece. There is a gap between the protective element and the lance head end of the oxygen blowing lance.
In dem Schutzelement sind Durchlässe vorhanden, durch welche die Sauerstoffauslassdüsen von der Schale nach außen geführt sind. Die Durchlässe sind so dimensioniert, dass zwischen der Sauerstoffauslassdüse und dem Schutzelement ein Spalt verbleibt.In the protective element passages are provided, through which the oxygen outlet nozzles are guided from the shell to the outside. The passages are dimensioned so that a gap remains between the oxygen outlet nozzle and the protective element.
Weiterhin sind in dem Schutzelement Öffnungen vorhanden, die das Schutzelement durchsetzen. Durch diese Öffnungen ist der Zwischenraum zwischen Schutzelement und lanzenkopfseitigem Ende der Sauerstoffblaslanze mit dem die Sauerstoffblaslanze umgebenden Raum verbunden.Furthermore, openings are present in the protective element, which pass through the protective element. Through these openings, the gap between the protective element and lanzenkopfseitigem end of the oxygen blowing lance is connected to the space surrounding the Sauerstoffblaslanze.
Es ist mindestens eine Schutzgasleitung vorhanden, die in den Zwischenraum zwischen dem Schutzelement und dem lanzenkopfseitigen Ende derThere is at least one inert gas line, which in the space between the protective element and the lancet end of the
Sauerstoffblaslanze mündet. Dadurch wird die Einbringung von Schutzgas in diesenOxygen blowing lance opens. As a result, the introduction of inert gas in these
Zwischenraum ermöglicht.Space allows.
In den Zwischenraum eingebrachtes Schutzgas kann durch die Spalte zwischenIn the space introduced inert gas can through the gaps between
Schutzelement und Sauerstoffauslassdüsen sowie durch die das Schutzelement durchsetzenden Öffnungen in den die Sauerstoffblaslanze umgebenden Raum strömen.Protective element and Sauerstoffauslassdüsen and through the protective element passing through openings in the space surrounding the Sauerstoffblaslanze space.
Vorzugsweise wird die Schutzgasleitung zumindest teilweise innerhalb des Spaltes zwischen Lanzenaußenrohr und Sauerstoffhauptrohr geführt. Dadurch wird sie durch das Lanzenaußenrohr vor mechanischer, thermischer und chemischer Beanspruchung und Verschleiß geschützt.Preferably, the inert gas line is at least partially guided within the gap between the lance outer tube and the main oxygen tube. As a result, it is protected by the lance outer tube against mechanical, thermal and chemical stress and wear.
Das erfindungsgemäße Verfahren zum Betrieb der erfindungsgemäßen Sauerstoffblaslanze zur Stahlerzeugung mit Schutzelement ist dadurch gekennzeichnet, dass Schutzgas aus der Schutzgasleitung in den Zwischenraum zwischen Abdeckschale und Schutzelement eingebracht und aus diesem Zwischenraum durch die Spalte zwischen Sauerstoffauslassdüsen und Schutzelement sowie durch die Öffnungen in dem Schutzelement nach außen geführt wird. Als Schutzgas kann jedes chemisch inerte Gas verwendet werden, beispielsweise Stickstoff oder Edelgase. Bevorzugt ist der Einsatz von Argon, Stickstoff, Helium.The inventive method for operating the oxygen blowing lance according to the invention for steel production with protective element is characterized in that inert gas from the inert gas introduced into the space between cover and protective element and out of this space through the gaps between Sauerstoffauslassdüsen and protective element and through the openings in the protective element to the outside becomes. As inert gas, any chemically inert gas can be used, for example nitrogen or noble gases. Preference is given to the use of argon, nitrogen, helium.
Durch das aus den Öffnungen und Spalten ausströmende Schutzgas werden sowohl das Schutzelement als auch die Sauerstoffauslassdüsen vor thermischer, chemischer und mechanischer Beanspruchung geschützt und ihr Verschleiß vermindert. Diese nach außen gerichteten Schutzgasströmungen verhindern, dass heiße Umgebungsgase sowie von diesen mitgeführten Partikel zur äußeren Oberfläche des Schutzelementes vordringen können und hemmen Wärmeübertragung, mechanische und chemische Angriffe auf das Schutzelement. Unter dem Begriff außen ist dabei die der Stahlschmelze zugewandte Seite des Schutzelementes zu verstehen. Da das Schutzgas das Material des Schutzelementes mit einer chemisch inerten Gasschicht umgibt, können für Schutzelement beziehungsweise Schutzkörper Materialien verwendet werden, die aufgrund ihrer Oxidationsempfindlichkeit unter den bei der Stahlerzeugung herrschenden Bedingungen nicht einsetzbar wären. Daher sind beispielsweise die guten Eigenschaften von Nitrid und Karbidkeramiken wie beipielsweise Siliziumnitrid, oder von Graphit bezüglich Resistenz gegen Temperatur, Temperaturwechsel, sowie chemische und mechanische Angriffe für Schutzelement beziehungsweise Schutzkörper ausnutzbar.The protective gas flowing out of the openings and gaps protects both the protective element and the oxygen outlet nozzles against thermal, chemical and mechanical stress and reduces their wear. These outward shielding gas flows prevent hot ambient gases and entrained particles from entering the outer surface of the protective element and inhibiting heat transfer, mechanical and chemical attack on the protective element. The term outside is to be understood as meaning the molten steel facing side of the protective element. Since the protective gas surrounds the material of the protective element with a chemically inert gas layer, it is possible for protective element or protective body to use materials which, owing to their sensitivity to oxidation, would not be usable under the conditions prevailing in steelmaking. Therefore, for example, the good properties of nitride and carbide ceramics such as silicon nitride, or of graphite with respect to resistance to temperature, temperature changes, as well as chemical and mechanical attacks for protective element or protective body can be exploited.
Es ist bekannt, dass beim Betrieb von Sauerstoffblaslanzen durch den aus Sauerstoffauslassdüsen mit hoher Geschwindigkeit ausströmenden Sauerstoff ein Unterdruck entsteht, der zur Ansaugung von heißen, gegebenenfalls partikelbeladenen Umgebungsgasen führt. Beim Betrieb der erfindungsgemäßen Sauerstoffblaslanze wird der Sauerstoffstrom jedoch von einem Schutzgasstrom umhüllt, der aus der dem Spalt zwischen Sauerstoffauslassdüse und Schutzelement nach außen strömt. Eine Ansaugung von Umgebungsgasen entgegen der Strömungsrichtung dieses umhüllenden Schutzgasstromes wird dadurch erschwert und damit ein durch diese Umgebungsgase hervorgerufener thermischer, chemischer und mechanischer Verschleiß vermindert.It is known that the operation of Sauerstoffblaslanzen by the oxygen outlet from the nozzle at high velocity effluent oxygen creates a negative pressure, which leads to the suction of hot, possibly particle-laden ambient gases. During operation of the oxygen blowing lance according to the invention, however, the oxygen stream is enveloped by an inert gas stream which flows out of the gap between the oxygen outlet nozzle and the protective element. A suction of ambient gases against the flow direction of this enveloping protective gas flow is made difficult and thus reduced by these ambient gases caused thermal, chemical and mechanical wear.
Schutzgasströmungen, die über die Oberfläche des Schutzelementes streichen, blasen anhaftende Rohstahl- und Schlackenspritzer von der Oberfläche weg. Dadurch wird durch solche Anhaftungen verursachter Verschleiß vermindert. Der Schutzgasstrom führt Wärme von Schutzelement und Sauerstoffauslassdüsen ab und kühlt dadurch. Der Kühlmittelkanäle enthaltende Spalt zwischen Lanzenaußenrohr und Sauerstoffhauptrohr ist lanzenkopfseitig geschlossen, die Kühlmittelkanäle sind also nicht im Schutzelement weitergeführt. Daher ist die Gefahr einer durch Verschleiß des Schutzelementes hervorgerufenen Leckage gemindert.Protective gas flows that sweep over the surface of the protective element, blow away adhering crude steel and slag splashes from the surface. As a result, wear caused by such adhesions is reduced. The protective gas flow dissipates heat from the protective element and oxygen outlet nozzles and thereby cools. The gap between the lance outer tube and the main oxygen tube containing the coolant channels is closed on the lance head, so the coolant channels are not continued in the protective element. Therefore, the risk of leakage caused by wear of the protective element is reduced.
Die Erfindung wird anhand der angeschlossenen beispielhaften und schematischen Figuren 1 und 2 sowie der folgenden Beschreibung erläutert. Fig. 1 zeigt einen Längsschnitt durch den lanzenkopfseitigen Endabschnitt einer im Betrieb befindlichen erfindungsgemäßen Sauerstoffblaslanze mit Schutzelement. Fig. 2 zeigt eine Schrägansicht des lanzenkopfseitigen Endabschnitts einer erfindungsgemäßen Sauerstoffblaslanze mit Schutzelement.The invention will be explained with reference to the attached exemplary and schematic Figures 1 and 2 and the following description. Fig. 1 shows a longitudinal section through the lance head end portion of an operating oxygen blowing lance according to the invention with protective element. Fig. 2 shows an oblique view of the lance head end portion of an oxygen blowing lance according to the invention with protective element.
Fig. 1 zeigt eine Sauerstoffblaslanze 1 , deren lanzenkopfseitiges Ende mit einem aus einem Schutzkörper 2 und einer Trägerkonstruktion 3 bestehenden Schutzelement versehen ist. Zwischen dem Lanzenaußenrohr 4 und dem Sauerstoffhauptrohr 5 ist ein Spalt 6 ausgebildet, der lanzenkopfseitig geschlossen ist. Dieser Spalt 6 ist durch ein Trennrohr 7 in zwei Kühlmittelkanäle 8a und 8b unterteilt, die lanzenkopfseitig durch Öffnungen in dem Trennrohr 7 miteinander verbunden sind. Die Verbindung der Kühlmittelkanäle 8a und 8b mit einer Kühlwasserzuleitung und Kühlwasserableitung ist nicht dargestellt. Die Durchströmung der Kühlmittelkanäle 8a und 8b mit Kühlwasser reduziert die thermische Belastung der Sauerstoffblaslanze während des Betriebes. Das lanzenkopfseitige Ende des Sauerstoffhauptrohres 5 ist mit einer Abdeckschale 9 versehen, welche das gesamte Ende des Sauerstoffhauptrohres 5 bedeckt. Die Abdeckschale besitzt mehrere Auslässe 10a und 10b und 10c, in die jeweils eine Sauerstoffauslassdüse 11 eingeschraubt ist. Das Schutzelement bedeckt das lanzenkopfseitige Ende der Sauerstoffblaslanze 1. Das Schutzelement ist über die Trägerkonstruktion 3 mittels eines Schnellwechselverschlusses an der Sauerstofflanze befestigt. Die Sauerstoffauslassdüsen 11 sind durch Durchlässe im Schutzkörper 2 nach außen geführt. Zwischen den Sauerstoffauslassdüsen 11 und dem Schutzkörper 2 verbleibt dabei ein Spalt. Das Schutzkörper 2 wird von Öffnungen 12 durchsetzt. Zwischen dem Schutzkörper 2 und dem lanzenkopfseitigen Ende der Sauerstoffblaslanze 1 ist ein Zwischenraum 13 vorhanden. In diesen Zwischenraum 13 mündet eine Schutzgasleitung 14, die innerhalb des Spaltes 6 zwischen Lanzenaußenrohr und Sauerstoffhauptrohr zu dem Zwischenraum 13 führt. Beim Betrieb der Sauerstoffblaslanze 1 strömt durch gerade Pfeile dargestellter Sauerstoff aus dem Sauerstoffhauptrohr 4 durch die Auslässe 10 und die Sauerstoffauslassdüsen 1 1 nach außen. Gleichzeitig strömt durch gewellte Pfeile dargestellte Schutzgas aus der Schutzgasleitung 14 in den Zwischenraum 13. Aus dem Zwischenraum 13 strömt das Schutzgas durch die Spalte zwischen den Sauerstoffauslassdüsen 1 1 und dem Schutzkörper 2 nach außen. Dabei wird der aus den Sauerstoffauslassdüsen 11 austretende Sauerstoffstrom von dem ausströmenden Schutzgas umhüllt. Weiterhin strömt das Schutzgas aus dem Zwischenraum 13 durch die Öffnungen 12 nach außen und überstreicht nach Austritt aus diesen Öffnungen die Oberfläche des Schutzkörpers 2.1 shows an oxygen blowing lance 1, whose lance head end is provided with a protective element consisting of a protective body 2 and a support structure 3. Between the lance outer tube 4 and the main oxygen tube 5, a gap 6 is formed, which is closed lance head side. This gap 6 is subdivided by a separating tube 7 into two coolant channels 8a and 8b, which are connected to one another by lances in the separating tube 7. The connection of the coolant channels 8a and 8b with a cooling water supply and cooling water drainage is not shown. The flow through the coolant channels 8a and 8b with cooling water reduces the thermal load on the oxygen blowing lance during operation. The lance head end of the main oxygen tube 5 is provided with a cover shell 9 which covers the entire end of the oxygen main tube 5. The cover shell has a plurality of outlets 10a and 10b and 10c, in each of which a Sauerstoffauslassdüse 11 is screwed. The protective element covers the lance-head end of the oxygen blowing lance 1. The protective element is attached to the oxygen lance via the support structure 3 by means of a quick-change closure. The oxygen outlet nozzles 11 are guided through passages in the protective body 2 to the outside. Between the Sauerstoffauslassdüsen 11 and the protective body 2 remains while a gap. The protective body 2 is penetrated by openings 12. Between the protective body 2 and the lance head end of the oxygen blowing lance 1, a gap 13 is present. In this space 13 opens a protective gas line 14, which within the gap 6 between the lance outer tube and Oxygen main pipe leads to the gap 13. During operation of the oxygen blowing lance 1, oxygen shown by straight arrows flows out of the main oxygen tube 4 through the outlets 10 and the oxygen outlet nozzles 11 to the outside. At the same time, inert gas represented by corrugated arrows flows from the protective gas line 14 into the intermediate space 13. From the intermediate space 13, the protective gas flows through the gaps between the oxygen outlet nozzles 11 and the protective body 2 to the outside. In this case, the oxygen flow emerging from the oxygen outlet nozzles 11 is enveloped by the outflowing protective gas. Furthermore, the protective gas flows out of the intermediate space 13 through the openings 12 to the outside and, after emerging from these openings, sweeps over the surface of the protective body 2.
Für die in Fig. 1 dargestellte Sauerstoffblaslanze zeigt Fig. 2 das Lanzenaußenrohr 4 und den daran anschließenden Schutzkörper 2 des Schutzelementes. Die Seitenwände des schalenförmigen Schutzkörpers 2 bestehen aus aufeinandergestapelten Ringen 15, die Grundfläche aus einer Platte 16. Sauerstoffauslassdüsen 1 1 sind durch Durchlässe im Schutzkörper 2 nach außen geführt, wobei zwischen Sauerstoffauslassdüse und Schutzkörper 2 jeweils ein Spalt verbleibt. Der Schutzkörper 2 weist Öffnungen 12 auf. Eine Schutzgasleitung 14, die teilweise außerhalb der Sauerstoffblaslanze verläuft, wird durch eine Einführöffnung 17 in den Spalt zwischen Lanzenaußenrohr 4 und Sauerstoffhauptrohr geführt.For the oxygen blowing lance shown in Fig. 1, Fig. 2 shows the lance outer tube 4 and the adjoining protective body 2 of the protective element. The side walls of the cup-shaped protective body 2 consist of rings 15 stacked on one another, the base of a plate 16. Oxygen outlet nozzles 11 are led through passages in the protective body 2 to the outside, a gap each remaining between the oxygen outlet nozzle and the protective body 2. The protective body 2 has openings 12. A protective gas line 14, which extends partially outside the oxygen blowing lance, is guided through an insertion opening 17 into the gap between the lance outer tube 4 and the main oxygen tube.
Gegenüber einer Sauerstoffblaslanze mit einer Schutzkappe wie nach dem Stand der Technik DE3122178A1 bietet die erfindungsgemäße Sauerstoffblaslanze mit Schutzelement den Vorteil, dass das Schutzelement und die Sauerstoffauslassdüsen durch das Schutzgas vor mechanischer, thermischer und chemischer Belastung und Verschleiß geschützt werden und somit seltener ausgetauscht werden müssen. Ist ein Austausch notwendig, können sowohl das Schutzelement als auch die Sauerstoffauslassdüsen mittels Schnellwechselverschlüssen ohne Aufwand durch frische Bauelemente ersetzt werden. Bezuqszeichenliste:Compared to an oxygen blowing lance with a protective cap as in the prior art DE3122178A1, the oxygen blowing lance with protective element according to the invention offers the advantage that the protective element and the oxygen outlet nozzles are protected by the protective gas from mechanical, thermal and chemical stress and wear and thus need to be replaced less frequently. If an exchange is necessary, both the protective element and the oxygen outlet nozzles can be replaced by quick-change closures without any effort by fresh components. LIST OF REFERENCES:
Sauerstoffblaslanze 1Oxygen blowing lance 1
Schutzkörper 2Protective body 2
Trägerkonstruktion 3Support structure 3
Lanzenaußenrohr 4Lance outer tube 4
Sauerstoffhauptrohr 5 Spalt 6Oxygen main tube 5 gap 6
Trennrohr 7Separating pipe 7
Kühlmittelkanäle 8a, 8bCoolant channels 8a, 8b
Abdeckschale 9Cover 9
Auslässe 10a, 10b, 10c Sauerstoffauslassdüse 1 1Outlets 10a, 10b, 10c Oxygen outlet nozzle 1 1
Öffnungen 12Openings 12
Zwischenraum 13Gap 13
Schutzgasleitung 14Protective gas line 14
Ring 15 Platte 16Ring 15 plate 16
Einführöffnung 17 Insertion opening 17
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT0096308A AT506984B1 (en) | 2008-06-17 | 2008-06-17 | OXYGEN BLASLANT WITH PROTECTIVE ELEMENT |
| PCT/EP2009/056267 WO2009153128A1 (en) | 2008-06-17 | 2009-05-25 | Oxygen blowing lance with protection element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2285992A1 true EP2285992A1 (en) | 2011-02-23 |
Family
ID=40909851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP09765708A Withdrawn EP2285992A1 (en) | 2008-06-17 | 2009-05-25 | Oxygen blowing lance with protection element |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US20110127348A1 (en) |
| EP (1) | EP2285992A1 (en) |
| JP (1) | JP2011524469A (en) |
| KR (1) | KR20110034001A (en) |
| CN (1) | CN102159732A (en) |
| AT (1) | AT506984B1 (en) |
| BR (1) | BRPI0914296A2 (en) |
| RU (1) | RU2011101456A (en) |
| WO (1) | WO2009153128A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012016142B3 (en) * | 2012-08-08 | 2013-10-17 | Saarstahl Ag | Hot blast lance with a nozzle block arranged at the hot blast outlet |
| DE102012016143A1 (en) * | 2012-08-08 | 2014-02-13 | Saarstahl Ag | Hot blast lance |
| WO2014056804A1 (en) * | 2012-10-08 | 2014-04-17 | L'air Liquide,Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Process and apparatus for improving the combustion of secondary fuel in a rotary kiln and process for retrofitting a rotary kiln with a burner assembly |
| BR102015003522A2 (en) * | 2015-02-19 | 2016-08-23 | Lumar Metals Ltda | metal manufacturing and refining blow boom assembly |
| CN114144533B (en) * | 2019-09-24 | 2023-03-28 | 西门子（中国）有限公司 | Oxygen gas transfer device, method for manufacturing oxygen gas transfer device, laval nozzle, and method for manufacturing laval nozzle |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3045997A (en) * | 1959-03-02 | 1962-07-24 | Armco Steel Corp | Porous oxygen lance |
| US3202201A (en) * | 1962-01-15 | 1965-08-24 | Chemetron Corp | Gas burner for melting and refining scrap metal |
| US3201104A (en) * | 1962-08-21 | 1965-08-17 | Walter V Berry | Oxygen lance for subsurface use |
| US4301969A (en) * | 1980-02-25 | 1981-11-24 | Sharp Kenneth C | Oxygen lance nozzle |
| FR2496699B1 (en) * | 1980-12-22 | 1985-06-21 | Siderurgie Fse Inst Rech | BLOWING NOZZLE FOR OXIDIZING GAS, ESPECIALLY OXYGEN, FOR THE TREATMENT OF FUSED METALS |
| DE3122178A1 (en) * | 1981-06-04 | 1983-01-20 | Ottmar 6600 Saarbrücken Mengelkoch | Detachable and replaceable heat and splash protection for oxygen lances for steel production |
| FR2521167B1 (en) * | 1982-02-10 | 1987-04-30 | Siderurgie Fse Inst Rech | GAS INJECTION LANCE FOR METALLURGICAL CONVERTER |
| US4434005A (en) * | 1982-09-24 | 1984-02-28 | Arbed S. A. (Luxembourg) | Method of and apparatus for refining a melt containing solid cooling material |
| JP3655659B2 (en) * | 1995-03-03 | 2005-06-02 | 新日本製鐵株式会社 | Blow acid sending method on converter with good yield |
| US5865876A (en) * | 1995-06-07 | 1999-02-02 | Ltv Steel Company, Inc. | Multipurpose lance |
| GB0128878D0 (en) * | 2001-12-03 | 2002-01-23 | Boc Group Plc | Metallurgical lance and apparatus |
| KR20070012478A (en) * | 2004-05-14 | 2007-01-25 | 더 비오씨 그룹, 인크. | Molten Metal Refining |
| US20070057417A1 (en) * | 2005-09-09 | 2007-03-15 | Michael Strelbisky | Metallurgical lance with annular gas flow control |
-
2008
- 2008-06-17 AT AT0096308A patent/AT506984B1/en not_active IP Right Cessation
-
2009
- 2009-05-25 EP EP09765708A patent/EP2285992A1/en not_active Withdrawn
- 2009-05-25 US US12/997,008 patent/US20110127348A1/en not_active Abandoned
- 2009-05-25 KR KR1020117001093A patent/KR20110034001A/en not_active Withdrawn
- 2009-05-25 WO PCT/EP2009/056267 patent/WO2009153128A1/en not_active Ceased
- 2009-05-25 RU RU2011101456/02A patent/RU2011101456A/en not_active Application Discontinuation
- 2009-05-25 BR BRPI0914296A patent/BRPI0914296A2/en not_active IP Right Cessation
- 2009-05-25 CN CN2009801228686A patent/CN102159732A/en active Pending
- 2009-05-25 JP JP2011513969A patent/JP2011524469A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2009153128A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| AT506984A1 (en) | 2010-01-15 |
| JP2011524469A (en) | 2011-09-01 |
| AT506984B1 (en) | 2010-06-15 |
| BRPI0914296A2 (en) | 2015-11-03 |
| US20110127348A1 (en) | 2011-06-02 |
| RU2011101456A (en) | 2012-07-27 |
| WO2009153128A1 (en) | 2009-12-23 |
| CN102159732A (en) | 2011-08-17 |
| KR20110034001A (en) | 2011-04-04 |
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