EP2216110A2 - Impulse coiling with inert gas in BOF and AOD converter process - Google Patents
Impulse coiling with inert gas in BOF and AOD converter process Download PDFInfo
- Publication number
- EP2216110A2 EP2216110A2 EP10000617A EP10000617A EP2216110A2 EP 2216110 A2 EP2216110 A2 EP 2216110A2 EP 10000617 A EP10000617 A EP 10000617A EP 10000617 A EP10000617 A EP 10000617A EP 2216110 A2 EP2216110 A2 EP 2216110A2
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- EP
- European Patent Office
- Prior art keywords
- inert gas
- during
- period
- fluid pressure
- converter
- 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.)
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Links
- 239000011261 inert gas Substances 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 60
- 239000012530 fluid Substances 0.000 claims abstract description 38
- 229910052742 iron Inorganic materials 0.000 claims abstract description 30
- 238000007664 blowing Methods 0.000 claims abstract description 20
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000155 melt Substances 0.000 claims abstract description 9
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 9
- 239000001301 oxygen Substances 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 claims description 35
- 238000010926 purge Methods 0.000 claims description 34
- 238000011010 flushing procedure Methods 0.000 description 14
- 238000002156 mixing Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000005261 decarburization Methods 0.000 description 3
- 238000000265 homogenisation Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 239000000700 radioactive tracer Substances 0.000 description 2
- YPFNIPKMNMDDDB-UHFFFAOYSA-K 2-[2-[bis(carboxylatomethyl)amino]ethyl-(2-hydroxyethyl)amino]acetate;iron(3+) Chemical compound [Fe+3].OCCN(CC([O-])=O)CCN(CC([O-])=O)CC([O-])=O YPFNIPKMNMDDDB-UHFFFAOYSA-K 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- VVTSZOCINPYFDP-UHFFFAOYSA-N [O].[Ar] Chemical compound [O].[Ar] VVTSZOCINPYFDP-UHFFFAOYSA-N 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
- B22D1/002—Treatment with gases
- B22D1/005—Injection assemblies therefor
-
- 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
Definitions
- the invention is directed to a process for the treatment of molten iron in a converter, in which the molten iron is treated during a blowing phase by top blowing oxygen and at least during a period of the blowing phase on the bottom side over several bottom or side nozzles an inert gas or an inert gas containing Fluid is blown into the melt.
- BOF Basic Oxygen Furnace
- AOD Argon Oxygen Decarburization
- inert gas nitrogen, argon
- nitrogen, argon is additionally injected into the molten iron via several - depending on the converter type - floor nozzles or side nozzles.
- the gas jets of the inert gas disintegrate rapidly after entering the molten iron into a plurality of individual bubbles, which rise, expand and entrain the surrounding melt.
- the continuous circulation or the continuous circulation of the molten iron - and thus its homogenization with respect to the self-adjusting temperature and concentration - is essentially induced by this process, the so-called buoyancy free jets.
- the thereby adjusting consumption of inert gas depends among other things on the converter size, the number and type of floor washers or floor jets (single-hole plug, multi-hole plug) or side jets, but also from the set or carried out by the operator converter mode of operation.
- a common way of driving is to keep the inert gas from the beginning of blowing as low as possible, ie on a so-called free-flushing gas, as a sufficiently high Schmelzbadmotorik is formed by the forming during the blowing phase, or formed having CO bubbles. Switching off the floor or side jets is not possible because they would otherwise be added with molten iron.
- the bottom or side jets play a much more important role in the mixing of the bath with molten iron and the reaction rate that sets itself.
- the blown inert gas is increased over the duration of several minutes until the predetermined, ie desired, target values of temperature and steel quality, ie the composition of the molten bath, are reached in the converter.
- a disadvantage of these known methods is that they are associated with a relatively high inert gas consumption, wherein in addition all bottom or side nozzles respectively present in a converter are in each case uniformly charged with inert gas or an inert gas-containing fluid.
- From the DE 25 118 62 C3 is a method for injecting jets of different impulses in metal melts, here in particular pig iron melts, known, in which the oxidizing agent used for oxidizing refining, the so-called, oxidizing agent (oxygen) is blown exclusively via bottom or side nozzles in the iron melt located in a converter.
- the bottom or side nozzles are divided into at least two groups which can be acted upon separately by the fluid (oxygen) and which can be acted upon independently with independently regulatable pressures during the blowing phase over a specific period of time.
- one group is fed with a moderate fluid pressure and the other group with a significantly increased fluid pressure, so that on the one hand, a small pulse and on the other hand, a stronger pulse, which acts in each case on the molten iron adjusts.
- all of the bottom or side nozzles are first subjected to the moderate fluid pressure, before then during a further period, a part of the bottom or side nozzles is subjected to the much higher fluid pressure, while the remaining part of the bottom or side nozzles with the or In contrast, significantly more moderate fluid pressure is applied.
- the invention has for its object to provide a solution which makes it possible to reduce the inert gas consumption in the implementation of BOF or AOD converter processes, without resulting in any impact on the achievable steel quality.
- this object is achieved in that at least over a period during the period of Blasphase a first part of the bottom or side vents with a moderate, the throughput of this first part of floor or side nozzles free-hold Purge gas amount of inert gas causing inert gas fluid pressure and the remaining part of the bottom or side nozzles with a contrast increased, the flow rate of a standard flushing gas amount of inert gas causing inert gas fluid pressure is applied.
- the invention By means of the invention, it is possible to reduce the amount of inert gas injected into the iron melt contained in the respective converter during a BOF or AOD converter process by the special, temporally variable purging behavior according to the invention, which is caused by the differently set inert gas fluid pressures. without this measure having an impact on the achievable and desired steel quality. This can save about 30% of the cost of inert gas.
- the invention is based on the assumption that the molten iron, once in motion and in circulation or in circulation, remains in this state for a certain period of time due to its inertia. During this period, the amount of inert gas can be reduced to the amount of purging purge gas without major impact on the chemical reactions occurring in the molten iron. By temporarily dispensing an amount of inert gas reduced from the standard amount of purge gas to a selected number of bottom or side nozzles, the operating costs for spent inert gas can be reduced.
- the invention is therefore characterized in an embodiment in that during the period each one-half of all available in a converter bottom or side nozzles with the moderate inert gas fluid pressure and the other half of all existing in a converter bottom or side nozzles with the increased inert gas Fluid pressure is applied.
- a local, variable change in reduced amount of purge gas can be achieved by an alternating purge called impulse purge.
- impulse purge an alternating purge
- the invention is characterized by the fact that during the time period and / or the time period, different groups of bottom or side nozzles are alternately exposed to the moderate or increased inert gas fluid pressure during a period of time.
- the process according to the invention can also be used advantageously in an AOD converter process, since in this way the inert gas introduced laterally via the side nozzles forms a revolving vortex roll in the AOD converter, which is responsible for the homogenization of the bath of molten iron.
- the pulse purge or pulse purge technique described above can be used, particularly at an extremely low frequency, with the frequency responsive to the alternating alternation of moderate to increased inert gas fluid pressure and vice versa with respect to a single side nozzle relates to a group of side nozzles.
- the invention consists in the bottom nozzles / floor washers of a BOF converter or the side nozzles / side flushing an AOD converter during the respective period of the blowing phase of the converter, during which an inert gas to the molten iron is carried out over a longer period the operating alternately and alternately at fixed periods of time, ie alternately and alternately over the specified period of time, with a moderate inert gas fluid pressure effecting the flow rate of a flushing purge gas and then, over the same period of time, increasing the throughput To apply a standard flushing gas amount causing inert gas fluid pressure.
- the alternating and alternating admission takes place in each case after a period of, for example, 30 to 60 seconds, during which a floor nozzle or a side nozzle or a group of floor nozzles or side nozzles, ie in each case a part of the bottom or side nozzles, each with one of the two inert gas. Fluid pressures is applied.
- one half of the bottom or side nozzles is charged with the standard amount of purge gas, while the other half of the existing bottom or side nozzles is acted upon or driven with the respectively necessary free-purge gas.
- the gas bubbles rising in the area of the bottom or side jets operated with the free-flow purge gas have (still) a high enough momentum to entrain the surrounding molten iron from the free-jet environment upwards and thus to ensure the important circulation and circulation of the molten iron ,
- Each gas bubble has a (final) ascent rate in the molten iron that depends on its diameter, among other things.
- a high rinsing rate ie a high flow rate of flushing gas through a floor or side nozzle, is consequently not necessarily associated with a higher rate of ascent of the forming bubbles.
- FIG Fig. 1 An example showing the relevance of the method according to the invention (pulse flushing) is shown in FIG Fig. 1 , It shows the conditions of a newly delivered 190 t BOF converter with six bottom nozzles (P1 - P6), a standard purge gas quantity of 48 Nm 3 / h, a free purge gas quantity of 20 Nm 3 / h and a period of time of 30 seconds for a portion of a pulse purge.
- the curves show the temporal and spatial propagation of an added tracer (indicator) at six different positions (P1-P6), as seen within the melt domain, ie within the molten iron.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
Description
Die Erfindung richtet sich auf ein Verfahren zur Behandlung einer Eisenschmelze in einem Konverter, bei welchem die Eisenschmelze während einer Blasphase durch oberseitiges Aufblasen von Sauerstoff behandelt wird und wobei zumindest während eines Zeitabschnittes der Blasphase konverterbodenseitig über mehrere Boden- oder Seitendüsen ein Inertgas oder ein Inertgas enthaltendes Fluid in die Schmelze eingeblasen wird.The invention is directed to a process for the treatment of molten iron in a converter, in which the molten iron is treated during a blowing phase by top blowing oxygen and at least during a period of the blowing phase on the bottom side over several bottom or side nozzles an inert gas or an inert gas containing Fluid is blown into the melt.
Beim sogenannten Frischen von Roheisen zur Aufbereitung in eine Stahlqualität werden in einem BOF-Konverter (BOF = Basic Oxygen Furnace) oder in beim AOD-Verfahren oder -Prozess (AOD = Argon Oxygen Decarburization) unerwünschte Begleitelemente wie Kohlenstoff, Silizium, Mangan, Phosphor oder Schwefel durch Aufblasen von Sauerstoff auf die Eisenschmelze entfernt. Der Aufblasvorgang alleine bringt nicht genügend kinetische Energie in die Eisenschmelze, um diese großräumig innerhalb des Konverters in Umlauf oder zur Umwälzung zu bringen und diese Umwälzbewegung aufrecht zu erhalten, um dadurch ständig frische Schmelze zum Brennfleck unterhalb der Blaslanze zu transportieren. Aus diesem Grund wird zusätzlich über mehrere - je nach Konvertertyp - Bodendüsen oder Seitendüsen zusätzlich Inertgas (Stickstoff, Argon) in die Eisenschmelze eingeblasen. Die Gasstrahlen des Inertgases zerfallen nach dem Eintritt in die Eisenschmelze rasch in eine Vielzahl von Einzelblasen, die aufsteigen, sich ausdehnen und die umgebende Schmelze mitreißen. Der kontinuierliche Umlauf oder die kontinuierliche Umwälzung der Eisenschmelze - und damit deren Homogenisierung bezüglich der sich einstellenden Temperatur und Konzentration - wird im Wesentlichen durch diesen Vorgang, die sogenannten Auftriebsfreistrahlen, induziert. Der sich dabei einstellende Verbrauch an Inertgas hängt unter anderem von der Konvertergröße, der Anzahl und Art der Bodenspüler oder Bodendüsen (single-hole plug, multi-hole plug) oder Seitendüsen, aber auch von der vom Betreiber festgelegten oder durchgeführten Konverter-Fahrweise ab. Eine übliche Fahrweise besteht darin, die Inertgasmenge ab Blasbeginn möglichst gering, d.h. auf einer sogenannten Freihalte-Spülgasmenge, zu halten, da durch die sich während der Blasphase bildenden, bzw. gebildet habenden CO-Blasen eine genügend hohe Schmelzbadmotorik entsteht. Ein Abschalten der Boden- oder Seitendüsen ist nicht möglich, da sich diese ansonsten mit Eisenschmelze zusetzen würden. Gegen Ende der Blasphase, wenn die Entkohlung des Bades aus Eisenschmelze nur noch langsam fortschreitet und die CO-Blasenbildung nachlässt, übernehmen die Boden- oder Seitendüsen eine deutlich wichtigere Rolle für die Durchmischung des Bades an Eisenschmelze und die sich einstellende Reaktionsgeschwindigkeit. Üblicherweise wird daher in diesem Zeitabschnitt die eingeblasene Inertgasmenge über die Dauer von mehreren Minuten erhöht, bis die vorgegebenen, d.h. erwünschten, Zielwerte der Temperatur und der Stahlqualität, d.h. der Zusammensetzung des Schmelzbades, in dem Konverter erreicht sind.In the so-called refining of pig iron for processing into a steel quality in a BOF converter (BOF = Basic Oxygen Furnace) or in the AOD process or process (AOD = Argon Oxygen Decarburization) unwanted accompanying elements such as carbon, silicon, manganese, phosphorus or Sulfur removed by blowing oxygen onto the molten iron. The inflation process alone does not bring enough kinetic energy into the molten iron to circulate or circulate it within the converter, and to maintain this tumbling motion, thereby constantly transporting fresh melt to the focal spot below the blowgun. For this reason, additional inert gas (nitrogen, argon) is additionally injected into the molten iron via several - depending on the converter type - floor nozzles or side nozzles. The gas jets of the inert gas disintegrate rapidly after entering the molten iron into a plurality of individual bubbles, which rise, expand and entrain the surrounding melt. The continuous circulation or the continuous circulation of the molten iron - and thus its homogenization with respect to the self-adjusting temperature and concentration - is essentially induced by this process, the so-called buoyancy free jets. The thereby adjusting consumption of inert gas depends among other things on the converter size, the number and type of floor washers or floor jets (single-hole plug, multi-hole plug) or side jets, but also from the set or carried out by the operator converter mode of operation. A common way of driving is to keep the inert gas from the beginning of blowing as low as possible, ie on a so-called free-flushing gas, as a sufficiently high Schmelzbadmotorik is formed by the forming during the blowing phase, or formed having CO bubbles. Switching off the floor or side jets is not possible because they would otherwise be added with molten iron. Towards the end of the blowing phase, when the decarburization of the bath of molten iron progresses only slowly and the formation of CO bubbles subsides, the bottom or side jets play a much more important role in the mixing of the bath with molten iron and the reaction rate that sets itself. Usually, therefore, in this period, the blown inert gas is increased over the duration of several minutes until the predetermined, ie desired, target values of temperature and steel quality, ie the composition of the molten bath, are reached in the converter.
Es ist aber auch üblich, die Boden- oder Seitendüsen während der gesamten Blasphase eines BOF-Konverters mit konstant hoher Spülleistung, d.h. mit einem konstant hohen, den Durchsatz einer Standard-Spülgasmenge bewirkenden Inertgas-Fluiddruck zu betreiben. Grund hierfür ist, dass hohe Spülleistungen und damit hohe Spülraten auch mit einer intensiven Vermischung und einer damit bewirkten Entkohlung des Bades aus Eisenschmelze verbunden sind.However, it is also common for the bottom or side nozzles to be maintained throughout the blowing phase of a BOF converter with a constant high flushing power, i. to operate with a constant high, the flow rate of a standard purge gas causing inert gas fluid pressure. The reason for this is that high flushing rates and thus high flushing rates are also associated with intensive mixing and the resulting decarburization of the bath of molten iron.
Nachteilig bei diesen bekannten Verfahren ist es, dass diese mit einem relativ hohen Inertgasverbrauch verbunden sind, wobei zudem alle jeweils in einem Konverter vorhandenen Boden- oder Seitendüsen jeweils gleichmäßig mit Inertgas oder einem Inertgas enthaltenden Fluid beaufschlagt werden.A disadvantage of these known methods is that they are associated with a relatively high inert gas consumption, wherein in addition all bottom or side nozzles respectively present in a converter are in each case uniformly charged with inert gas or an inert gas-containing fluid.
Aus der
Der Erfindung liegt die Aufgabe zugrunde, eine Lösung zu schaffen, die es ermöglicht, den Inertgasverbrauch bei der Durchführung von BOF- oder AOD-Konverterprozessen zu reduzieren, ohne dass sich Auswirkungen auf die erzielbare Stahlqualität ergeben.The invention has for its object to provide a solution which makes it possible to reduce the inert gas consumption in the implementation of BOF or AOD converter processes, without resulting in any impact on the achievable steel quality.
Bei einem Verfahren der eingangs näher bezeichneten Art wird diese Aufgabe erfindungsgemäß dadurch gelöst, dass zumindest über einen Zeitraum während des Zeitabschnittes der Blasphase ein erster Teil der Boden- oder Seitendüsen mit einem mäßigen, den Durchsatz einer diesen ersten Teil an Boden- oder Seitendüsen freihaltenden Freihalte-Spülgasmenge an Inertgas bewirkenden Inertgas-Fluiddruck und der verbleibende Teil der Boden- oder Seitendüsen mit einem demgegenüber erhöhten, den Durchsatz einer Standard-Spülgasmenge an Inertgas bewirkenden Inertgas-Fluiddruck beaufschlagt wird.In a method of the type described in more detail, this object is achieved in that at least over a period during the period of Blasphase a first part of the bottom or side vents with a moderate, the throughput of this first part of floor or side nozzles free-hold Purge gas amount of inert gas causing inert gas fluid pressure and the remaining part of the bottom or side nozzles with a contrast increased, the flow rate of a standard flushing gas amount of inert gas causing inert gas fluid pressure is applied.
Durch die Erfindung ist es möglich, die während eines BOF- oder AOD-Konverterprozesses in die, in dem jeweiligen Konverter befindliche Eisenschmelze eingeblasene Inertgasmenge durch das erfindungsgemäße spezielle, zeitlich veränderliche Spülverhalten, welches durch die unterschiedlich eingestellten Inertgas-Fluiddrücke bewirkt wird, zu reduzieren, ohne dass diese Maßnahme Auswirkungen auf die erzielbare und gewünschte Stahlqualität haben. Hierdurch lassen sich etwa 30 % der Kosten für Inertgas einsparen. Die Erfindung geht dabei davon aus, dass die einmal in Bewegung gebrachte und im Umlauf bzw. in der Umwälzung befindliche Eisenschmelze infolge ihrer Trägheit auch über einen bestimmten Zeitraum in diesem Zustand verbleibt. Während dieses Zeitraumes kann die Inertgasmenge auf die Freihalte-Spülgasmenge reduziert werden, ohne dass sich größere Auswirkungen auf die in der Eisenschmelze ablaufenden chemischen Reaktionen ergeben. Durch das zeitweilige Abgeben einer gegenüber der Standard-Spülgasmenge verringerten Inertgasmenge an eine ausgewählte Anzahl an Boden- oder Seitendüsen lassen sich die Betriebskosten für verbrauchtes Inertgas reduzieren.By means of the invention, it is possible to reduce the amount of inert gas injected into the iron melt contained in the respective converter during a BOF or AOD converter process by the special, temporally variable purging behavior according to the invention, which is caused by the differently set inert gas fluid pressures. without this measure having an impact on the achievable and desired steel quality. This can save about 30% of the cost of inert gas. The invention is based on the assumption that the molten iron, once in motion and in circulation or in circulation, remains in this state for a certain period of time due to its inertia. During this period, the amount of inert gas can be reduced to the amount of purging purge gas without major impact on the chemical reactions occurring in the molten iron. By temporarily dispensing an amount of inert gas reduced from the standard amount of purge gas to a selected number of bottom or side nozzles, the operating costs for spent inert gas can be reduced.
Besonders zweckmäßig ist es hierbei, wenn jeweils die Hälfte der vorhandenen Boden- oder Seitendüsen mit dem mäßigen und die jeweils verbleibende andere Hälfte mit dem erhöhten Inertgas-Fluiddruck beaufschlagt wird. Die Erfindung zeichnet sich daher in Ausgestaltung dadurch aus, dass während des Zeitraums jeweils eine Hälfte aller in einem Konverter vorhandenen Boden- oder Seitendüsen mit dem mäßigen Inertgas-Fluiddruck und die andere Hälfte aller in einem Konverter vorhandenen Boden- oder Seitendüsen mit dem erhöhten Inertgas-Fluiddruck beaufschlagt wird.It is particularly expedient in this case if in each case half of the existing bottom or side nozzles with the moderate and the remaining remaining half is acted upon by the increased inert gas fluid pressure. The invention is therefore characterized in an embodiment in that during the period each one-half of all available in a converter bottom or side nozzles with the moderate inert gas fluid pressure and the other half of all existing in a converter bottom or side nozzles with the increased inert gas Fluid pressure is applied.
Eine lokale, variable Änderung an reduzierter Spülgasmenge lässt sich durch ein alternierendes Spülen, als Impulsspülen bezeichnet, erreichen. Die Erfindung zeichnet sich daher schließlich auch dadurch aus, dass während des Zeitabschnittes und/oder des Zeitraumes alternierend während einer Zeitspanne jeweils unterschiedliche Gruppen von Boden- oder Seitendüsen mit dem mäßigen oder dem erhöhten Inertgas-Fluiddruck beaufschlagt werden.A local, variable change in reduced amount of purge gas can be achieved by an alternating purge called impulse purge. Finally, the invention is characterized by the fact that during the time period and / or the time period, different groups of bottom or side nozzles are alternately exposed to the moderate or increased inert gas fluid pressure during a period of time.
Auch bei einem AOD-Konverterprozess lässt sich das erfindungsgemäße Verfahren vorteilhaft anwenden, da hierdurch das über die Seitendüsen seitlich eingebrachte Inertgas eine umlaufende Wirbelwalze im AOD-Konverter bildet, die für die Homogenisierung des Bades an Eisenschmelze verantwortlich ist. Da dieses Wirbelsystem relativ stabil ist, lässt sich auch hier das vorstehend beschriebene Impulsspülen oder Impulsspülverfahren anwenden, dies insbesondere mit einer extrem niedrigen Frequenz, wobei sich die Frequenz auf den alternierenden Wechsel von mäßigem zu erhöhtem Inertgas-Fluiddruck und vice versa bezüglich einer einzelnen Seitendüse oder einer Gruppe von Seitendüsen bezieht.The process according to the invention can also be used advantageously in an AOD converter process, since in this way the inert gas introduced laterally via the side nozzles forms a revolving vortex roll in the AOD converter, which is responsible for the homogenization of the bath of molten iron. Again, since this vortex system is relatively stable, the pulse purge or pulse purge technique described above can be used, particularly at an extremely low frequency, with the frequency responsive to the alternating alternation of moderate to increased inert gas fluid pressure and vice versa with respect to a single side nozzle relates to a group of side nozzles.
In einer besonders vorteilhaften Ausprägung besteht die Erfindung darin, die Bodendüsen/Bodenspüler eines BOF-Konverters oder die Seitendüsen/Seitenspüler eines AOD-Konverters während des jeweiligen Zeitabschnittes der Blasphase des Konverters, während welcher eine Inertgasbeaufschlagung der Eisenschmelze durchgeführt wird, über einen längeren Zeitraum die unterschiedlichen Druckbeaufschlagungen der Boden- oder Seitendüsen alternierend und abwechselnd mit festgelegten Zeitspannen zu betreiben, d.h. alternierend und abwechselnd über die festgelegte Zeitspanne mit einem mäßigen, den Durchsatz einer Freihalte-Spülgasmenge bewirkenden Inertgas-Fluiddruck und dann über dieselbe Zeitspanne mit einem demgegenüber erhöhten, den Durchsatz einer Standard-Spülgasmenge bewirkenden Inertgas-Fluiddruck zu beaufschlagen. Hierbei erfolgt die alternierende und abwechselnde Beaufschlagung jeweils nach einer Zeitspanne von beispielsweise 30 bis 60 Sekunden, während welcher eine Bodendüse oder eine Seitendüse oder eine Gruppe von Bodendüsen oder Seitendüsen, d.h. jeweils ein Teil der Boden- oder Seitendüsen, mit jeweils einem der beiden Inertgas-Fluiddrücke beaufschlagt wird. Jeweils während der jeweiligen Zeitspanne wird eine Hälfte der Boden- oder Seitendüsen mit der Standard-Spülgasmenge beaufschlagt, während die andere Hälfte der vorhandenen Boden- oder Seitendüsen mit der jeweils notwendigen Freihalte-Spülgasmenge beaufschlagt bzw. gefahren wird. Nach Ablauf dieser Zeitspanne erfolgt eine Änderung, insbesondere Umkehrung der Spülverhältnisse, d.h. die bisher mit der Standard-Spülgasmenge beaufschlagten Boden- oder Seitendüsen werden dann für die vorgesehen Zeitspanne mit der Freihalte-Spülgasmenge beaufschlagt und die bisher mit der Freihalte-Spülgasmenge beaufschlagten Boden- oder Seitendüsen werden für dieselbe Zeitspanne mit der Freihalte-Spülgasmenge beaufschlagt. Über einen vorgegebenen Zeitraum während des Zeitabschnittes der Blasphase oder über den gesamten Zeitabschnitt der Blasphase hinweg wird dieser Vorgang des alternierenden Wechsels der Beaufschlagung der Boden- oder Seitendüsen mit einem unterschiedlichen Inertgas-Fluiddruck so oft wiederholt, bis die geforderte oder gewünschte Zusammensetzung und Temperatur des Bades der Eisenschmelze in dem jeweiligen BOF- oder AOD-Konverter erreicht ist. Die in dem Bereich der mit der Freihalte-Spülgasmenge betriebenen Boden- oder Seitendüsen aufsteigenden Gasblasen besitzen (noch) einen genügend hohen Impuls, um die umgebende Eisenschmelze aus der Freistrahlumgebung mitzureißen, aufwärts zu transportieren und damit den wichtigen Umlauf und die Umwälzung der Eisenschmelze zu gewährleisten. Jede Gasblase weist dabei eine unter anderem von ihrem Durchmesser abhängige (finale) Aufstiegsgeschwindigkeit in der Eisenschmelze auf. Eine hohe Spülrate, d.h. ein hoher Durchsatz an Spülgasmenge durch eine Boden- oder Seitendüse ist folglich nicht zwangsläufig mit einer höheren Aufstiegsgeschwindigkeit der sich bildenden Blasen verbunden. Vorteilhaft ist es, wenn jeweils benachbarte Boden- oder Seitendüsen zu einem jeweiligen Zeitpunkt jeweils mit dem gleichen Inertgas-Fluiddruck beaufschlagt und somit mit derselben Inertgas-Spülgasmenge gefahren werden, was sich dadurch erreichen lässt, dass immer eine Konverterhälfte mit der Standard-Spülgasmenge und eine Konverterhälfte mit der Freihalte-Spülgasmenge beaufschlagt wird. Hierdurch lassen sich die Kosten für das benötigte Inertgas-Spülgas bei Verwendung typischer Röhrchenspüler (single-hole plug) als Bodendüsen um 30 % reduzieren, wobei das Einsparpotential bei als multi-hole Spüler ausgebildeten Bodendüsen noch etwas höher liegt und wobei sich diese Einsparungswerte auf BOF-Konverter beziehen.In a particularly advantageous embodiment, the invention consists in the bottom nozzles / floor washers of a BOF converter or the side nozzles / side flushing an AOD converter during the respective period of the blowing phase of the converter, during which an inert gas to the molten iron is carried out over a longer period the operating alternately and alternately at fixed periods of time, ie alternately and alternately over the specified period of time, with a moderate inert gas fluid pressure effecting the flow rate of a flushing purge gas and then, over the same period of time, increasing the throughput To apply a standard flushing gas amount causing inert gas fluid pressure. In this case, the alternating and alternating admission takes place in each case after a period of, for example, 30 to 60 seconds, during which a floor nozzle or a side nozzle or a group of floor nozzles or side nozzles, ie in each case a part of the bottom or side nozzles, each with one of the two inert gas. Fluid pressures is applied. In each case during the respective period of time, one half of the bottom or side nozzles is charged with the standard amount of purge gas, while the other half of the existing bottom or side nozzles is acted upon or driven with the respectively necessary free-purge gas. After this period, there is a change, in particular reversal of the purge conditions, ie the previously acted upon with the standard purge gas bottom or side nozzles are then applied for the intended period of time with the flushing purge gas and the previously acted upon with the free-purge gas amount soil or Side jets are pressurized for the same amount of time with the flushing purge gas. Over a predetermined period of time during the time period of the blowing phase or over the entire period of the blowing phase, this process of alternately alternating the application of the bottom or side nozzles with a different inert gas fluid pressure is repeated until the required or desired composition and temperature of the bath of molten iron in the respective BOF or AOD converter is reached. The gas bubbles rising in the area of the bottom or side jets operated with the free-flow purge gas have (still) a high enough momentum to entrain the surrounding molten iron from the free-jet environment upwards and thus to ensure the important circulation and circulation of the molten iron , Each gas bubble has a (final) ascent rate in the molten iron that depends on its diameter, among other things. A high rinsing rate, ie a high flow rate of flushing gas through a floor or side nozzle, is consequently not necessarily associated with a higher rate of ascent of the forming bubbles. It is advantageous if in each case adjacent bottom or side nozzles are each acted upon at a respective time with the same inert gas fluid pressure and thus driven with the same inert gas flushing gas, which can be achieved in that always a converter half with the standard purge gas and a Converter half is acted upon with the free-purge gas. As a result, the cost of the required inert gas purge gas can be reduced when using typical single-hole plug as floor nozzles by 30%, the potential savings in designed as a multi-hole dishwasher floor nozzles is still slightly higher and these savings on BOF Refer to converter.
Ein Beispiel, aus dem die Relevanz des erfindungsgemäßen Verfahrens (impulsspülung) ersichtlich ist, zeigt die
Claims (3)
dadurch gekennzeichnet,
dass zumindest über einen Zeitraum während des Zeitabschnittes der Blasphase ein erster Teil der Boden- oder Seitendüsen mit einem mäßigen, den Durchsatz einer diesen ersten Teil an Boden- oder Seitendüsen freihaltenden Freihalte-Spülgasmenge an Inertgas bewirkenden Inertgas-Fluiddruck und der verbleibende Teil der Boden- oder Seitendüsen mit einem demgegenüber erhöhten, den Durchsatz einer Standard-Spülgasmenge an Inertgas bewirkenden Inertgas-Fluiddruck beaufschlagt wird.A process for the treatment of an iron melt in a converter, wherein the molten iron is treated during a blowing phase by top blowing oxygen and wherein at least during a period of the blowing phase on the bottom side over several bottom or side nozzles, an inert gas or an inert gas containing fluid is injected into the melt .
characterized,
in that at least over a period of time during the period of the blowing phase, a first part of the bottom or side nozzles is provided with a moderate inert gas fluid pressure and the remaining part of the bottom part of the bottom part or side nozzles, the throughput of a free-hold purge gas or side nozzles with a contrast increased, the flow rate of a standard purge gas to inert gas causing inert gas fluid pressure is applied.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102009005795 | 2009-01-22 | ||
| DE102009049896A DE102009049896A1 (en) | 2009-01-22 | 2009-10-20 | Pulse flushing with inert gas in the BOF and AOD converter process |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP2216110A2 true EP2216110A2 (en) | 2010-08-11 |
| EP2216110A3 EP2216110A3 (en) | 2017-02-08 |
| EP2216110B1 EP2216110B1 (en) | 2021-06-23 |
Family
ID=42309065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP10000617.0A Active EP2216110B1 (en) | 2009-01-22 | 2010-01-22 | Impulse coiling with inert gas in BOF and AOD converter process |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP2216110B1 (en) |
| DE (1) | DE102009049896A1 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2511862A1 (en) | 1974-04-11 | 1975-10-23 | Creusot Loire | METHOD AND DEVICE FOR INJECTING RAYS OF DIFFERENT IMPULSES INTO METAL MELT |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4334921A (en) * | 1979-04-16 | 1982-06-15 | Nippon Steel Corporation | Converter steelmaking process |
| FR2473064A1 (en) * | 1980-01-02 | 1981-07-10 | Siderurgie Fse Inst Rech | PROCESS FOR PNEUMATIC BREWING OF A FUSION METAL BATH |
| JPH05105925A (en) * | 1991-10-17 | 1993-04-27 | Nippon Steel Corp | Metal bath type smelting reduction method |
| AT411530B (en) * | 2002-08-21 | 2004-02-25 | Voest Alpine Ind Anlagen | Decarburization of molten stainless steel in a converter involves delivering the treatment gas through an opening below the molten level and blower lances above it, to mix the gas thoroughly through the molten metal |
-
2009
- 2009-10-20 DE DE102009049896A patent/DE102009049896A1/en not_active Withdrawn
-
2010
- 2010-01-22 EP EP10000617.0A patent/EP2216110B1/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2511862A1 (en) | 1974-04-11 | 1975-10-23 | Creusot Loire | METHOD AND DEVICE FOR INJECTING RAYS OF DIFFERENT IMPULSES INTO METAL MELT |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2216110A3 (en) | 2017-02-08 |
| EP2216110B1 (en) | 2021-06-23 |
| DE102009049896A1 (en) | 2010-08-05 |
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