EP3443132B1 - Blaslanzendüse - Google Patents

Blaslanzendüse Download PDF

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Publication number
EP3443132B1
EP3443132B1 EP17722381.5A EP17722381A EP3443132B1 EP 3443132 B1 EP3443132 B1 EP 3443132B1 EP 17722381 A EP17722381 A EP 17722381A EP 3443132 B1 EP3443132 B1 EP 3443132B1
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EP
European Patent Office
Prior art keywords
front wall
advantageously
pillar
lance nozzle
central
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EP17722381.5A
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English (en)
French (fr)
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EP3443132A1 (de
Inventor
Jean-Philippe Thomas
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Soudobeam SA
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Soudobeam SA
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    • 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
    • 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

Definitions

  • the blowing lance nose as described in the present invention is used, inter alia, in oxygen converters for the manufacture of steel (BOF, Basic Oxygen Furnace).
  • the converters make it possible to obtain steel by injecting gas, preferably containing oxygen, into a liquid iron bath in order to burn the carbon contained therein.
  • the basic principle in the field of oxygen blowing in converters (for example in LD converters (for Linz-Donawitz)) is to propel 3 to 6 jets of oxygen arranged in a crown on a bath of liquid cast iron.
  • the lance which allows the formation of these oxygen jets is then placed at a distance of 1 to 5 m above a bath of molten iron whose temperature can reach 1700 ° C.
  • the temperature of the nose of the lance can then increase rapidly to 400 ° C. and must remain in this environment for approximately 20 minutes.
  • the nose is then removed and returns to room temperature, that is to say 20 ° C.
  • a coolant can circulate along the internal wall facing the bath of the lance nose.
  • a coolant usually water
  • the calories from the metal forming that wall are transferred to the coolant.
  • the temperature of the lance nose is uniform over the entire nose, and no longer particularly high only at the walls exposed to the bath.
  • the documents US4432534 and WO9623082 have, for example, lance noses designed to allow the flow of a coolant at high speed along the internal surface of the front wall, this same front wall has a slight central depression in order to optimize this flow .
  • the document EP0340207 provides for a significant depression in the central area of the lance nose on which are directed secondary jets of coolant causing a swirl in the flow of the liquid.
  • the document WO0222892 attempts to further improve the flow of coolant in the heat exchange space of the lance nose by developing a central depression in the face facing the bath having a well determined ratio between height and base of this depression. This ratio allows the heat exchange space to have a section for the passage of the coolant substantially constant so as to obtain a speed of passage of the coolant through this space which is approximately constant.
  • the document DE102006010287 describes a blowing lance nose used for the production of steel which contains a central pillar connecting the gas supply tube to the front wall exposed to the bath and a cooling system comprising an element for dividing the coolant. Indeed, two parallel flows are obtained between the first and the second walls of this lance nose before recombining in the heat exchange space.
  • the document US2012 / 211929 A1 discloses another example of the known prior art of a blowing lance nose.
  • the diameter of the injector outlet ports tends to increase following the erosion of their edges. This increase in diameter deforms the oxygen jets, which causes, in addition to the destruction of the lance nose, a dispersion of these jets and consequently a reduction in their effectiveness.
  • the carbon oxidation reaction is, in fact, favored by the depth of penetration of the jets into the bath and by the stirring of the latter.
  • the lance noses being placed at a distance of 1 to 5 m above the melt bath, in order to be effective, the jets must have a coherent profile over the longest possible distance. The reaction yield is then reduced when these jets are dispersed because they penetrate less deeply into the melt. The reaction yield in the bath is therefore not optimal and moreover exhibits significant variability during the lifetime of the lance nose.
  • Effective cooling is therefore important for the proper functioning of the lance noses because it has the advantage of increasing the lifetime of the latter but also of guaranteeing better stability of reaction yield throughout their lifetime and this by minimizing erosion at the edges of the duct outlets for the mixing gas of the front wall.
  • such cooling is also very difficult to implement, under the extreme conditions encountered during the use of the lance noses.
  • the object of the present invention is to overcome the drawbacks of the state of the art by providing a lance nose which is simple to manufacture, the lifespan of which is increased and which allows an improved and stable reaction yield throughout the duration of nose life.
  • a lance nose as indicated at the beginning in which the pillar has between said first and second ends a thinned part connected to the central zone which has a predetermined length L1 and a axial section continuously decreasing towards the central zone so that the pillar forms with the central zone of the internal surface of the third front wall a continuous curved surface.
  • continuous curved surface is meant a surface which has a “continuity of curves”, preferably a “continuity of tangents”.
  • tangent continuity is meant, according to the present invention, that, in an axial section of the pillar, the curve of the thinned part of the pillar and the curve of the central zone of the internal surface of the third front wall have tangents equal at their common end, i.e. at their junction (second end of the pillar). Tangents are the first derivatives of curves at their common end.
  • a second degree of “continuity of curves” can possibly be a “continuity of curvatures”, which then means that the radii of curvature of the two curves (thinned part of the pillar and central zone of the internal surface of the third front wall) are equal at their common end, i.e. at their junction (second end of the pillar).
  • the curves of the thinned part of the pillar and of the central zone of the internal surface of the third central wall have the same direction at their junction and also have the same radius at this point.
  • the radii of curvature are the second derivatives of the curves at their common end, that is to say at their junction at the second end of the pillar.
  • This particular geometry allows on the one hand to avoid disturbances and on the other hand to improve the acceleration of the coolant.
  • the thinned part of the pillar forming a continuous curved surface with the central zone of the internal surface of the third front wall makes it possible, on the one hand, to optimize the trajectory of the coolant.
  • the latter arrives from the first annular cavity, runs along the second front wall and converges in the central opening to rotate therein by approximately 180 ° before arriving in the heat exchange space and then leaving through the second cavity.
  • the injectors represent a first obstacle during the passage of the coolant between the first and the second front wall and a second obstacle in the heat exchange space between the second and the third front wall. Given the complexity of this route, it is not easy to avoid turbulence within the coolant. This turbulence can appear, during the first bypassing of the injectors between the first and the second front wall.
  • the present invention therefore proposes to thin the pillar at the central opening so that the coolant which is introduced therein can rotate as gradually as possible. Indeed, when it converges in the central opening, the coolant will go along the thinned part of the pillar to arrive at the level of the continuity of curves with the central zone of the third front wall. This liquid is therefore kept in constant contact with the front wall exposed to high temperatures, thus allowing it to cool effectively.
  • the thinned part of the pillar by virtue of its curved profile in axial section, makes it possible to increase the contact surface between the pillar and the coolant and to bring this liquid into contact with the central part of the third wall. which is most exposed to extreme temperatures.
  • the continuous curved surface between the pillar and the internal surface of the front wall makes it possible to minimize the energy losses.
  • the acceleration of the liquid is therefore maintained in the heat exchange space, which is advantageous for good cooling of the lance nose.
  • This particular curvature of the thinned part of the pillar and of the central zone of the internal surface of the third front wall has, among other advantages, to provide the coolant with the most gradual passage possible at the junction between the pillar and the front wall where the liquid should rotate around 180 ° in the central opening. Maintaining contact between the liquid and the front wall to be cooled is then ensured and the disturbances from the first bypass of the injectors are lessened and the disturbances during the second bypass of the injectors are greatly minimized. Furthermore, the increase in the contact surface between the pillar and the coolant is ensured by this large radius of curvature of this continuous curved surface.
  • the lance noses according to the present invention have an increased service life because the mechanical stresses are greatly reduced.
  • these noses make it possible to obtain high and constant reaction yields throughout the lifetime of the nose thanks to the reduction in erosion of the outlet edges of the injectors.
  • the lance nose according to the present invention has a predetermined outer diameter, D ext and a pillar having a second portion of predetermined length L2 joining said thinned portion and said first end, said second portion having a circular cross section defined by a predetermined diameter D2, constant over the entire length L2, such that the ratio D2 / D ext is between 2% and 30%, advantageously between 4% and 25%, preferably between 4% and 20%, in particular between 6 % and 20%, preferably between 6% and 15%, particularly advantageously between 8% and 15%, advantageously between 10% and 15%.
  • the pillar can be considered to be “solid” in view of the volume it occupies in the lance nose.
  • This massive pillar advantageously made of a material with good thermal conductivity, such as copper, ensures good transfer. calories accumulated in the front wall exposed to the bath to the gas supply tube. This calorie transfer phenomenon is called a "cold sink".
  • the heat transferred by the pillar then diffuses towards the coolant circulating around it and whose heat exchange surface is increased thanks to the thinned part having a curved profile.
  • the heat is, therefore, better distributed within the lance nose which more particularly ensures good cooling of the area most exposed to extreme temperatures, namely the center of the third front wall.
  • the lance nose according to this embodiment therefore results in an additional improvement in the cooling of the nose and therefore an increase in the life of the nose and the obtaining of high and constant reaction yields throughout the life of the nose thanks to reduced erosion of the injector outlet edges.
  • said thinned part of the lance nose according to the present invention has a circular cross section defined by a predetermined diameter D1 varying progressively from the value of the predetermined diameter D2 at the junction with said second part, to a value included between 20% and 95%, advantageously between 30% and 90%, preferably between 40% and 85%, preferably between 50% and 80%, in particular between 60% and 80% of D2 at the second end E2.
  • the diameter D1 of the thinned part of the pillar therefore progressively decreases when one moves along the longitudinal axis of the lance nose towards the bath until reaching a minimum value at the second end E2 of the pillar located in the area center of the internal surface of the third front wall.
  • said continuous curved surface between the thinned part I of the pillar and the central zone of the internal surface of the third front wall is characterized by a minimum radius of curvature greater than or equal to 20%, advantageously greater than or equal to 30%, preferably greater than or equal to 40%, in particular greater than or equal to 50%, particularly preferably greater than or equal to 60%, preferably greater than or equal to 70% of said predetermined diameter D2 of said second part.
  • This particular radius of curvature is advantageous for improving the flow of the coolant.
  • the latter is thus kept in contact with the wall exposed to the bath and the turbulence is reduced. This therefore results in an improvement in the cooling of the lance nose.
  • the length L1 is such that the ratio L1 / D ext is between 3 and 50%, advantageously between 5% and 50%, preferably between 7% and 45% , in particular between 9% and 40%, preferably between 11% and 35%, preferably between 13% and 30%, particularly advantageously between 15% and 25%.
  • the length L2 is such that the ratio L2 / L1 is between 100% and 200%, advantageously between 105% and 190%, preferably between 110% and 180%, in particularly between 115% and 170%, preferably between 120% and 165%, particularly advantageously between 125% and 160, advantageously between 130% and 155%, preferably between 135% and 150%.
  • This particular ratio of lengths of the pillar makes it possible to further improve the cooling of the lance nose according to the present invention thanks to the phenomenon of cold wells obtained by the "massive" pillar.
  • the pillar of the lance nose according to the present invention is in one piece.
  • said separator has at the central opening an edge in axial section which is curved such that a height H3 is defined between a front of said edge and said third front wall and that in the heat exchange space a predetermined minimum height H1 is present on the side of said central opening such that the H1 / H3 ratio is between 5% and 80%, advantageously between 5% and 75%, preferably between 5% and 70%, preferably between 5% and 65%, particularly advantageous between 5% and 60%, preferably between 10% and 60%, advantageously between 15% and 60%, preferably between 20% and 60%, preferably between 25% and 60%, in a particularly advantageous manner between 25% and 55%, preferably between 30% and 55%.
  • this separator having a particular geometry allows, on the one hand, to further optimize the flow of the coolant passing through the central opening where it passes between the pillar and the edge of the separator and on the other hand to accelerate the coolant as it passes through the heat exchange space.
  • the edge of the separator in this particular embodiment, has a complementary shape with the thinned part of the central pillar. This complementary shape between these two elements is particularly advantageous for accompanying the coolant during its rotation of about 180 ° in the central opening, thereby avoiding any turbulence in the liquid and maintaining good contact with the pillar serving as a "cold well" and then with the third front wall.
  • this geometry also allows the acceleration of the coolant before it passes through the heat exchange space.
  • the lance nose according to the present invention is characterized by a distance R2, for the passage of the coolant, taken perpendicular to the longitudinal axis L of the nose, in the central opening, between the front of the separator and the external surface of the thinned part I of the pillar.
  • This passage distance R2 is such that the ratio R2 / H3 is between 20% and 150%, preferably between 30% and 140%, advantageously between 30% and 130%, preferably between 40% and 130%, of particularly way advantageous between 50% and 130%, preferably between 60% and 120%, advantageously between 60% and 110%, reference between 70% and 110%.
  • the invention advantageously further comprises a deflector substantially at the center of said central tube for supplying stirring gas.
  • This deflector makes it possible to appropriately divert the gas leaving the central duct to engage in the outlet conduits.
  • the axes of revolution of the outlet conduits for the stirring gas are oriented obliquely relative to a longitudinal axis of the lance nose.
  • said thinned part I of the pillar has a predetermined minimum diameter D3 at its second end and said central zone has a height h and a base b such that the ratio h / (b-D3) is between 20% and 120%, preferably between 20% and 110%, advantageously between 30% and 110%, preferably between 30% and 100%, in particular between 40% and 100%, particularly advantageously between 40% and 90%, preferably between 45% and 85%, advantageously between 50% and 80%.
  • the heat exchange surface is in this way increased relative to the same surface of the heat front coming from the bath, and this without causing either swirling or cavitation in the liquid.
  • the cross section of the liquid in the heat exchange space is such that the coolant has an adequate speed profile so that the cooling of the front wall exposed to the bath is further improved.
  • the aforementioned elements of the lance nose according to the present invention are produced separately and fixed in mutual connection zone by high energy welding, preferably an electron beam welding.
  • the aforementioned nose is made of several nose elements each consisting of a material chosen according to the function to be fulfilled. These elements are then fixed together by high energy welding, preferably by electron beam. This type of welding provides easily achievable copper-steel junctions and having good liquid tightness, despite the fatigue stresses due to the successive thermal cycles to which the nose is subjected.
  • the third front wall and the pillar of the lance nose according to the present invention can be made of wrought copper which provides better thermal conductivity than cast copper.
  • the figure 1 illustrates the third front wall 12 of the lance nose 1 which faces the bath.
  • the lance nose 1 has six gas outlet orifices 13 placed in a ring around a central zone 14 of the third front wall 12.
  • the figure 2 represents the lance nose according to the present invention in which the gas is supplied by the central tube 2.
  • This central tube 2 is closed by a front wall 3 directed towards the bath and provided with openings 4.
  • An internal tube 5 is arranged coaxially around the central tube 2 so as to form between them an annular cavity 6 serving for the supply of coolant in the direction of the arrow F 1 .
  • This internal tube 5 is terminated by a front wall 7 which is called a separator.
  • This front wall 7 is provided with a central opening 8 and an orifice 9 in alignment with each opening 4 in the central tube 2.
  • An external tube 10 is arranged coaxially around the internal tube 5.
  • This external tube forms with the internal tube 5 an annular cavity 11 which serves for the outlet of the coolant in the direction of the arrow F 2 .
  • This external tube is closed by a front wall 12 which faces the brewing bath.
  • the internal surface 30 of the third front wall 12 is provided with a central zone 14.
  • the front wall 12 is also provided with an outlet orifice 13 in alignment with each opening 4 provided in the front wall 3 and with each through orifice 9 provided in the front wall 7.
  • an outlet conduit 17 for the ejection of stirring gas outside the lance nose.
  • the axes of revolution m of these conduits 17 are advantageously directed obliquely to the longitudinal axis L of the lance nose.
  • the cooling of the front wall 12 is ensured by the circulation of the coolant in the heat exchange space 16 which is located between the separator 7 and the internal surface 30 of the front wall 12.
  • the cooling water coming from the cavity 6 passes through the central opening 8 in the heat exchange zone 16 according to the arrow F 3 . There, it flows in the direction of arrow F 2 outward, that is to say towards the cavity 11.
  • the spear nose shown on the figure 4 has a pillar 22 having a first end E1 on the side of the first front wall 3 and a second end E2 connected to the central zone 14 of the internal surface 30 of the third front wall 12.
  • the pillar according to the present invention shown in detail on the Figure 4 has a thinned part I which makes it possible to form a continuous curved surface with the central zone 14 of the internal surface 30 of the third front wall 12.
  • the coolant coming from the first annular cavity 6 along the arrow F 1 runs along the upper face of the separator 7 where it must bypass the injectors 17 for the first time before converging on the central opening 8.
  • the pillar 22 present at the center of this central opening 8 then makes it possible to "calm” the coolant and to guide it towards the internal surface 30 of the third front wall 12 where the thinned part I of the pillar 22 ensures the passage of the liquid between the pillar 22 and the edge of the separator 7, along arrow F 3 .
  • the junction of the third front wall 12 with the pillar 22 has a continuous curved surface ensuring progressive rotation of the liquid according to arrow F 3 .
  • the coolant the disturbances of which are lessened, then arrives in the heat exchange space 16.
  • the coolant can then calmly bypass the injectors 17 in the heat exchange space before emerging from the nose through the second cavity annular 11 along arrow F 2 .
  • the calories accumulated in the front wall 12 exposed to the liquid iron bath are transferred to the pillar 22 whose contact surface with the coolant is increased thanks to its curved thinned part I.
  • the pillar 22 advantageously has a second part II of predetermined length L2 joining said thinned part I and said first end E1, said second part II having a circular cross section defined by a predetermined diameter D2, constant over the entire length L2 , such that the D2 / D ext ratio is reference between 10% and 15%.
  • the outer diameter D ext of the lance nose 1 according to the present invention corresponds to the diameter measured between the external surfaces of the external tube 10.
  • the volume occupied by the pillar 22 in the lance nose is large, which makes it possible to create what is called a "cold well".
  • the pillar 22 being advantageously made of a material of good thermal conductivity, the heat coming from the bath and transmitted to the third front wall 12 and to its central zone 14, can then be led by the pillar 22 towards the internal parts of the nose.
  • the cooling liquid circulating around this pillar 22 ensures constant capture of the heat from the third front wall 12.
  • the parts most exposed to the bath namely the third front wall and the pillar, can be made of wrought copper which provides better thermal conductivity than cast copper.
  • the first part I of the pillar 22 is also characterized by a predetermined length L1 measured, along the longitudinal axis L of the lance nose, such that the ratio L2 / L1 is preferably between 135% and 150%.
  • the first thinned part I is further characterized by a predetermined diameter D1 which gradually varies from the diameter D2 at the junction with the second part II to a value preferably between 20% and 95% of D2 at the second end E2 of the pillar 22.
  • the diameter D1 of the thinned part I of the pillar 22 therefore gradually decreases when one moves along the longitudinal axis L of the lance nose towards the bath until reaching a minimum value, then called D3, at the second end E2 of the pillar located on the central zone 14 of the internal surface 30 of the third front wall 12.
  • the second end E2 therefore corresponds to the section of minimum diameter D3 of the thinned part I of the pillar 22.
  • This section of minimum diameter D3 of the thinned part I of the pillar 22 is connected to the central zone 14 of the internal wall 30 of the third front wall 12.
  • the thinned part I also has a predetermined length L1 measured along the longitudinal axis L of the lance nose between the junction with the second part II and the second end E2 of the pillar, where the diameter of the pillar is minimum and is then called D3.
  • L1 / D ext is between 15% and 25%.
  • the continuous curved surface between the thinned part I of the pillar 22 and the central zone 14 of the internal surface 30 of the third front wall 12 is preferably characterized by a radius of curvature greater than or equal to 30% of the diameter D2 of the second part Pillar II II.
  • the pillar 22 is in one piece.
  • the separator 7 has at the central opening 8 an edge 18 in axial section which is curved such that a height H3 is defined between a front 21 of said edge 18 and said internal surface 30 of the third front wall 12 and that in the 'heat exchange space 16 a predetermined minimum height H1 is present on the side of said central opening 8.
  • a minimum diameter of the central opening 8 can then be measured from the front 21 of the separator.
  • the tangent passing through this front 21 makes it possible to measure the smallest diameter that can be measured in the central opening 8.
  • the height taken along the tangent passing through the front 21 and parallel to the longitudinal axis L of the lance nose and measured between said front 21 and the third front wall 12 corresponds to the height H3, as indicated on the figure 4 .
  • the separator 7 is substantially planar and substantially parallel to the third front wall 12.
  • the curvature 20 of the edge 18 of the separator 7 has the advantage of accompanying the coolant when it converges in the central opening 8.
  • the coolant with reduced disturbance and cavitation phenomenon can then calmly enter the heat exchange space 16 before to come out of the nose through the second annular cavity 11 according to arrow F 2 .
  • the height H1 is itself measured, parallel to the axis of revolution m of the injector 17, between the surface facing the bath of the separator and the internal surface 30 of the third front wall 12, on the side of the opening central 8.
  • This height H1 defines a minimum passage section for the coolant in the heat exchange space 16 at the central opening 8.
  • H1 is the minimum height of the water passage along the internal surface 30 of the third front wall 12, in the heat exchange space 16.
  • passage section is meant , according to the present invention, a section taken perpendicular to the direction of flow of the coolant.
  • the H1 / H3 ratio is between 5% and 80%, advantageously between 10% and 60%, preferably between 30% and 50%.
  • the separator 7 has on its edge 18 a thickness e1 so that the ratio e1 / D ext is preferably between 7% and 15%.
  • a thickness of the separator 7 is measured between the surface facing the first front wall and the surface facing the third front wall of the separator 7.
  • the thickness e1 of the edge 18 of the separator 7 is therefore measured parallel to the axis of revolution m of the injector 17, in continuity with the minimum height H1 of the heat exchange space 16 at the central opening 8
  • This thickness e1 allows the separator to occupy a substantial volume in the lance nose and allows in combination with the curvature 20 of the edge 18 to maintain a flow with reduced disturbance and allowing good acceleration of the coolant.
  • the surface facing the bath of the separator 7 is substantially sinusoidal. This means that the surface facing the bath of the separator 7 has a minimum thickness substantially in its center. Consequently, the heat exchange space 16 has, in addition to a height H1 at the central opening 8, a maximum height H max substantially at the center of the separator 7. This maximum height has, among other things, as a consequence of reducing the losses during the second bypass of the injectors 17 in the heat exchange space 16. before it passes through the second annular cavity 11.
  • a deflector 24 can be placed in the center of the stirring gas supply tube 2. This deflector 24 makes it possible to appropriately divert the oxygen leaving the central pipe 2 to engage in the outlet pipes 17.
  • the figure 5 represents a detail of the central zone 14 of the internal surface 30 of the third front wall 12 in order to explain how to measure the parameters relating to this central zone 14.
  • this central zone 14 can have a height h measured between the tangent plane 32 of the internal surface 30 of the third front wall of the lance nose perpendicular to the longitudinal axis L and the plane 31 perpendicular to the longitudinal axis L passing through the minimum diameter section D3 of the thinned portion I of the pillar 22.
  • the base b is located in the tangent plane 32 of the internal surface 30 of the third front wall. It is circumscribed by the points of intersection 33 with the extension of the internal surface 30 of the third front wall 12.
  • the nose according to the present invention has an h / (b-D3) ratio of between 50% and 80%.
  • the figure 5 also represents the distance R2 for the passage of the coolant taken perpendicular to the longitudinal axis L of the nose between the front 21 of the separator and the external surface of the thinned part I of the pillar 22.
  • This passage section is such that the ratio R2 / H3 is preferably between 70% and 110%.

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  • Chemical & Material Sciences (AREA)
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Claims (12)

  1. Blaslanzendüse (1), die zum Rühren einer Schmelze bestimmt ist, Folgendes umfassend:
    - ein zentrales Rohr zur Versorgung mit Rührgas (2), das an einem Ende, das der Schmelze zugewandt, durch eine erste Vorderwand (3) geschlossen ist, die mit mindestens zwei Öffnungen (4) versehen ist,
    - ein inneres Rohr (5), das mit dem zentralen Rohr (2) einen ersten ringförmigen Hohlraum (6) für den Durchgang einer Kühlflüssigkeit bildet, und an einem Ende, das der Schmelze zugewandt ist, durch eine zweite, Separator (7) genannte Vorderwand abgeschlossen ist, die eine zentrale Öffnung (8) und ein Durchgangsloch (9) durch eine Öffnung aufweist, die in der ersten Vorderwand (4) vorgesehen ist,
    - ein äußeres Rohr (10), das mit dem inneren Rohr (5) einen zweiten ringförmigen Hohlraum (11) für den Durchgang einer Kühlflüssigkeit bildet, und an einem Ende, das der Schmelze zugewandt ist, durch eine dritte Vorderwand (12) geschlossen ist, die ein Ausgangsloch (13) durch eine Öffnung aufweist, die in der ersten Vorderwand (4) vorgesehen ist, und eine innere Oberfläche (30) aufweist, die eine zentrale Zone (14) umfasst,
    - einen Wärmetauschraum (16), der sich zwischen einerseits der zweiten Vorderwand (7) und der dritten Vorderwand (12), und andererseits der zentralen Öffnung und dem zweiten ringförmigen Hohlraum (11) befindet, und in dem die Kühlflüssigkeit strömt, und
    - eine Ausgangsleitung für das Rührgas, Injektor (17) genannt, die von jeder Öffnung (4) in der ersten Vorderwand (3) abgeht, und bis zu dem entsprechenden Ausgangsloch (13) verläuft, in einer gegenüber der Kühlflüssigkeit dichten Art und Weise durch ein entsprechendes Durchgangsloch (9) führend, und
    - eine Säule (22), die ein erstes Ende (E1) umfasst, das sich gegenüber der Schmelze befindet, und ein zweites Ende (E2), das der Schmelze zugewandt ist, mit einer zentralen Zone (14) der inneren Oberfläche (30) der dritten Vorderwand (12) verbunden,
    dadurch gekennzeichnet, dass die Säule (22) zwischen dem ersten und zweiten Ende (E1 und E2) ein verjüngtes Teil (I) aufweist, das mit der zentralen Zone (14) verbunden ist, die eine vorbestimmte Länge L1 und einen abnehmenden axialen Querschnitt aufweist, sodass die Säule (22) mit der zentralen Zone (14) der inneren Oberfläche (30) der dritten Vorderwand (12) eine durchgehende gebogene Oberfläche bildet.
  2. Lanzendüse nach Anspruch 1, einen vorbestimmten Außendurchmesser (Dext) aufweisend, und in der die Säule (22) ein zweites Teil (II) einer vorbestimmten Länge L2 aufweist, das an das verjüngte Teil (I) und das erste Ende (E1) anschließt, wobei das zweite Teil (II) einen kreisförmigen Querschnitt aufweist, der durch einen vorbestimmten Durchmesser (D2), der über die gesamte Länge L2 konstant ist, definiert wird, sodass das Verhältnis D2/ Dext zwischen 2 % und 30 %, vorzugsweise zwischen 4 % und 25 %, auf bevorzugte Weise zwischen 4 % und 20 %, insbesondere zwischen 6 % und 20 %, vorzugsweise zwischen 6 % und 15 %, und auf besonders bevorzugte Weise zwischen 8 % und 15 %, vorteilshalber zwischen 10 % und 15 % enthalten ist.
  3. Lanzendüse nach Anspruch 2, wobei das verjüngte Teil (I) einen kreisförmigen Querschnitt aufweist, der durch einen vorbestimmten Durchmesser (D1) definiert wird, der progressiv von dem Wert des vorbestimmten Durchmessers (D2) am Anschluss mit dem zweiten Teil (II) auf einen Wert variiert, der zwischen 20 % und 95 %, vorteilshalber zwischen 30 % und 90 %, auf bevorzugte Weise zwischen 40 % und 85 %, vorzugsweise zwischen 50 % und 80 %, insbesondere zwischen 60 % und 80 % von D2 am zweiten Ende E2 enthalten ist.
  4. Lanzendüse nach einem der Ansprüche 2 und 3, wobei die durchgehende gebogene Oberfläche durch einen Mindestbiegeradius größer oder gleich 20 %, vorteilshalber größer oder gleich 30 %, in vorteilhafter Weise größer oder gleich 40 %, insbesondere größer oder gleich 50 %, in besonders bevorzugter Weise größer oder gleich 60 %, vorzugsweise größer oder gleich 70 % des vorbestimmten Durchmessers (D2) des zweiten Teils (II) gekennzeichnet ist.
  5. Lanzendüse nach einem der Ansprüche 2 bis 4, wobei die Länge L1 derart ist, dass das Verhältnis L1/Dext zwischen 3 und 50 %, vorteilshalber zwischen 5 % und 50 %, auf bevorzugte Weise zwischen 7 % und 45 %, insbesondere zwischen 9 % und 40 %, vorzugsweise zwischen 11 % und 35 %, vorzugsweise zwischen 13 % und 30 %, in besonders vorteilhafter Weise zwischen 15 % und 25 % enthalten ist.
  6. Lanzendüse nach einem der Ansprüche 2 bis 5, wobei die Länge L2 derart ist, dass das Verhältnis L2/L1 zwischen 100 % und 200 %, vorteilshalber zwischen 105 % und 190 %, auf bevorzugte Weise zwischen 110 % und 180 %, insbesondere zwischen 115 % und 170 %, vorzugsweise zwischen 120 % und 165 %, in besonders bevorzugter Weise zwischen 125 % und 160 %, vorteilshalber zwischen 130 % und 155 %, vorzugsweise zwischen 135 % und 150 % enthalten ist.
  7. Lanzendüse nach einem der Ansprüche 1 bis 6, wobei die Säule (22) aus einem Stück ist.
  8. Lanzendüse nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass der Separator (7) an der zentralen Öffnung (8) einen Rand (18) im axialen Querschnitt aufweist, der derart gebogen ist, dass eine Höhe (H3) zwischen einer Stirnseite (21) des Randes (18) und der dritten Vorderwand (12) definiert wird, und dass in dem Wärmetauschraum (16) eine vorbestimmte Mindesthöhe (H1) auf Seiten der zentralen Öffnung (8) vorhanden ist, sodass das Verhältnis H1/H3 zwischen 5 % und 80 %, vorteilhafterweise zwischen 5 % und 75 %, vorzugsweise zwischen 5 % und 70 %, auf bevorzugte Weise zwischen 5 % und 65 %, auf besonders bevorzugte Weise zwischen 5 % und 60 %, vorzugsweise zwischen 10 % und 60 %, vorteilshalber zwischen 15 % und 60 %, vorzugsweise zwischen 20 % und 60 %, auf bevorzugte Weise zwischen 25 % und 60 %, auf besonders vorteilhafte Weise zwischen 25 % und 55 %, vorzugsweise zwischen 30 % und 55 % enthalten ist.
  9. Lanzendüse nach einem der Ansprüche 1 bis 8, wobei ein Abweiser (24) im Wesentlichen im Zentrum des zentralen Rohres zur Versorgung mit Rührgas (2) vorhanden ist.
  10. Lanzendüse nach einem der Ansprüche 1 bis 9, wobei die Injektoren (17) eine Drehachse (m) aufweisen, die im Verhältnis zu einer Längsachse (L) der Lanzendüse schräg ausgerichtet ist.
  11. Lanzendüse nach einem der Ansprüche 1 bis 10, wobei der verjüngte Teil I der Säule (22) einen vorbestimmten Mindestdurchmesser D3 an dem zweiten Ende (E2) aufweist, und die zentrale Zone (14) eine Höhe h und eine Basis b aufweist, sodass das Verhältnis h/ (b-D3) zwischen 20 % und 120 %, vorzugsweise zwischen 20 % und 110 %, vorteilshalber zwischen 30 % und 110 %, in bevorzugter Weise zwischen 30 % und 100 %, insbesondere zwischen 40 % und 100 %, auf besonders bevorzugte Weise zwischen 40 % und 90 %, vorzugsweise zwischen 45 % und 85 %, vorteilshalber zwischen 50 % und 80 % enthalten ist.
  12. Blaslanzendüse nach einem der Ansprüche 1 bis 11 dadurch gekennzeichnet, dass die Elemente der Düse getrennt gefertigt werden und in einer gegenseitigen Montagezone durch Hochenergieschweißen, vorzugsweise durch Elektronenstrahlschweißen befestigt werden.
EP17722381.5A 2016-04-15 2017-04-13 Blaslanzendüse Active EP3443132B1 (de)

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Application Number Priority Date Filing Date Title
BE2016/5264A BE1023582B1 (fr) 2016-04-15 2016-04-15 Nez de lance de soufflage
PCT/EP2017/058981 WO2017178611A1 (fr) 2016-04-15 2017-04-13 Nez de lance de soufflage

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Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2521167B1 (fr) 1982-02-10 1987-04-30 Siderurgie Fse Inst Rech Lance d'injection de gaz pour convertisseur metallurgique
AT389710B (de) 1988-04-25 1990-01-25 Voest Alpine Ind Anlagen Blaslanze
RU2051974C1 (ru) 1995-01-25 1996-01-10 Александр Леонидович Кузьмин Наконечник кислородно-конвертерной фурмы
BE1009743A3 (fr) * 1995-06-23 1997-07-01 Thomas Jacques Tuyere de soufflage a oxygene siderurgique.
US6217824B1 (en) * 1999-05-20 2001-04-17 Berry Metal Company Combined forged and cast lance tip assembly
BE1013686A3 (fr) * 2000-09-15 2002-06-04 Thomas Jacques Nez de lance de soufflage.
US7402274B2 (en) * 2005-12-07 2008-07-22 Berry Metal Company Metal making lance slag detection system
DE102006010287A1 (de) 2006-03-02 2007-09-13 Saar-Metallwerke Gmbh Sauerstofflanzenkopf
US8926895B2 (en) * 2008-01-24 2015-01-06 A.H. Tallman Bronze Company, Limited Post-combustion lance including an internal support assembly

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
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EP3443132A1 (de) 2019-02-20
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