EP3443132A1 - Nez de lance de soufflage - Google Patents
Nez de lance de soufflageInfo
- Publication number
- EP3443132A1 EP3443132A1 EP17722381.5A EP17722381A EP3443132A1 EP 3443132 A1 EP3443132 A1 EP 3443132A1 EP 17722381 A EP17722381 A EP 17722381A EP 3443132 A1 EP3443132 A1 EP 3443132A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nose
- advantageously
- pillar
- lance
- end wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000007664 blowing Methods 0.000 title claims abstract description 6
- 238000003756 stirring Methods 0.000 claims abstract description 12
- 239000000110 cooling liquid Substances 0.000 claims description 14
- 238000003466 welding Methods 0.000 claims description 5
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 238000005304 joining Methods 0.000 claims description 3
- 210000001331 nose Anatomy 0.000 description 83
- 239000002826 coolant Substances 0.000 description 39
- 239000007788 liquid Substances 0.000 description 19
- 238000001816 cooling Methods 0.000 description 17
- 239000007789 gas Substances 0.000 description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 230000003628 erosive effect Effects 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 230000001133 acceleration Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000000750 progressive effect Effects 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000010894 electron beam technology Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
- 238000005493 welding type Methods 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
- 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 present invention relates to a blowing nozzle nose, intended for brewing baths, comprising
- a central tube for supplying stirring gas closed at one end facing the bath by a first end wall provided with at least two openings,
- an inner tube forming, with the central tube, a first annular cavity for the passage of a cooling liquid and terminated at one end facing the bath by a second end wall, called a separator, having a central opening and a through-hole; opening provided in said first front wall,
- an outlet duct for the stirring gas called an injector, starting from each opening in said first end wall and going up to said corresponding outlet orifice passing through said corresponding through orifice in a manner that is sealed to the cooling liquid,
- the blowing nozzle nose as described in the present invention is used, inter alia, in the 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 bath of molten iron 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 ring on a bath of molten iron. The lance that allows the formation of these jets of oxygen 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 grow rapidly up to 400 ° C and have to stay in this environment for about 20 minutes.
- the nose is then removed and returns to room temperature, ie 20 ° C.
- a coolant can circulate along the inner wall facing the bath of the lance nose.
- a coolant usually water
- the calories of the metal forming the wall are transferred to the coolant.
- the temperature of the lance nose is uniformized over the entire nose, and no longer elevated only at the walls exposed to the bath.
- Poor circulation of the coolant can also cause a local rise in coolant temperature.
- locally the liquid can pass into the vapor phase under thermal stress. This results in the formation of cavities filled with trapped gas within the coolant. This formation of gaseous cavities in a liquid is known as the phenomenon of cavitation.
- the documents US4432534 and WO9623082 have, for example, lance noses designed to allow the flow of a coolant at high speed along the inner surface of the front wall, the same front wall has a slight central depression to optimize this flow.
- the document WO0222892 attempts to further improve the flow of the coolant in the heat exchange space of the lance nose by developing a central depression in the face facing the bath having a well-defined 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 coolant flow rate through this space which is approximately constant.
- Document DE102006010287 discloses a blow 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 liquid. cooling. Indeed, two parallel streams are obtained between the first and second walls of the lance nose before recombining in the heat exchange space.
- the diameter of the outlets of the injectors tends to increase following the erosion of the edges thereof. 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 decrease in the effectiveness thereof.
- the carbon oxidation reaction is, in fact, favored by the depth of penetration of the jets in the bath and by stirring thereof.
- the lance noses are placed at a distance of 1 to 5 m above the cast iron bath, in order to be effective, the jets must present a coherent profile over a longest possible distance. The Reaction efficiency is then decreased when these jets are dispersed as they penetrate less deeply into the melt. The reaction efficiency in the bath is therefore not optimal and in addition has a significant variability over the lifetime of the nose lance.
- Effective cooling is therefore important for the proper functioning of the lance noses because it has the advantage of increasing the life of these but also to ensure a better reaction performance stability throughout their life and this by minimizing erosion at the edges of the duct outlets for the stirring gas of the front wall. Only such cooling is also very difficult to implement, in the extreme conditions encountered during the use of spear noses.
- the object of the present invention is to overcome the disadvantages of the state of the art by providing a simple lance nose to be manufactured whose life is increased and which allows an improved and stable reaction efficiency throughout the duration of the life of the nose.
- a lance nose as indicated at the beginning in which the pillar has between said first and second ends a thinned portion connected to the central zone which has a predetermined length L1 and a axial section decreasing continuously to the central area so that the pillar forms with the central area of the inner surface of the third end wall a continuous curved surface.
- continuous curved surface means a surface which has a “continuity of curves”, preferably a “continuity of tangents”.
- discontinuity of tangents is meant, according to the present invention, that, in an axial section of the pillar, the curve of the thinned portion of the pillar and the curve of the central zone of the inner surface of the third end wall have equal tangents at their common end, i.e. at their junction (second end of the pillar).
- the tangents are the first derivatives of the curves at their common end.
- a second degree of “continuity of curves” may be a “continuity of curvature”, which means that the radii of curvature of the two curves (thinned portion of the pillar and central zone of the inner surface of the third end wall) are equal at their common end, that is to say at their junction (second end of the pillar).
- the curves of the thinned portion of the pillar and the central zone of the inner 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 makes it possible on the one hand to avoid disturbances and on the other hand to improve the acceleration of the coolant.
- the thinned portion of the pillar forming a continuous curved surface with the central zone of the inner surface of the third end wall makes it possible, on the one hand, to optimize the path of the coolant.
- the latter comes from the first annular cavity, along the second end wall and converges in the central opening to rotate about 180 ° before arriving in the heat exchange space and then out through the second cavity annular.
- the injectors represent a first obstacle during the passage of coolant between the first and second end wall and a second obstacle in the heat exchange space between the second and third end wall. Given the complexity of this course, it is not easy to avoid turbulence within the coolant. This turbulence can appear during the first bypass of the injectors between the first and the second end wall.
- the present invention therefore proposes to thin the pillar at the central opening so that the coolant introduced therein can make a rotation as progressive as possible. Indeed, when it converges in the central opening, the coolant will go along the thinned portion of the pillar to reach the level of continuity of curves with the central zone of the third end wall. This liquid is therefore kept in constant contact with the front wall exposed to high temperatures, thus allowing it to be cooled efficiently.
- the thinned portion of the pillar by its curved profile in axial section, increases the contact surface between the pillar and the coolant and bring the liquid in contact with the central portion of the third wall frontal which is the most exposed to extreme temperatures.
- the continuous curved surface between the pillar and the inner surface of the front wall minimizes energy losses.
- the acceleration of the liquid is consequently maintained in the heat exchange space, which is advantageous for good cooling of the lance nose.
- This particular curvature of the thinned portion of the pillar and of the central zone of the inner surface of the third end wall has, among other things, the advantage of providing the coolant with the most progressive passage possible at the junction between the pillar and the front wall where the liquid must rotate about 180 ° in the central opening.
- the maintenance of the 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 reduced and the disturbances during the second bypass of the injectors are greatly minimized.
- the increase of the contact surface between the pillar and the cooling liquid is ensured by this large radius of curvature of this continuous curved surface.
- the lance noses according to the present invention thanks to their optimized cooling system, have an increased service life because the mechanical stresses are greatly reduced.
- these noses can achieve high and constant reaction yields throughout the life of the nose through the reduction of erosion of the output edges of the injectors.
- the lance nose according to the present invention has an outside diameter, D ext , predetermined 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 % 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 "massive" in view of the volume it occupies in the lance nose.
- This massive pillar advantageously made of a material of good thermal conductivity, such as copper, ensures a good transfer calories accumulated in the front wall exposed to the bath to the gas supply tube. This phenomenon of calorie transfer is called “cold sinks".
- the heat transferred by the pillar then diffuses to the coolant circulating around it and whose heat exchange surface is increased thanks to the thinned portion having a curved profile.
- the heat is, therefore, better distributed within the lance nose which ensures more particularly a good cooling of the most exposed to extreme temperature zone, namely the center of the third end wall.
- the lance nose according to this embodiment therefore results in a further improvement of the nose cooling and thus an increase in the life of the nose and the achievement of high and constant reaction yields throughout the life of the nose. nose by reducing the erosion of the outlet edges of the injectors.
- said thinned portion of the lance nose according to the present invention has a circular cross-section defined by a predetermined diameter D1 gradually varying from the value of the predetermined diameter D2 to the junction with said second portion, to a value comprised between 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 portion of the pillar thus decreases progressively as 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 on the zone. central of the inner surface of the third end wall.
- said continuous curved surface between the thinned portion I of the pillar and the central zone of the inner surface of the third end 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 coolant flow.
- the latter is thus kept in contact with the wall exposed to the bath and turbulence is reduced. As a result, there is 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 L 2 is such that the ratio L 2 / L 1 is between 100% and 200%, advantageously between 105% and 190%, preferably between 110% and 180%, 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 the lengths of the pillar makes it possible to further improve the cooling of the lance nose according to the present invention by virtue of the cold well phenomenon obtained by the "massive" pillar.
- the pillar of the lance nose according to the present invention is monobloc.
- 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 end 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 ratio H1 / H3 is between 5% and 80%, advantageously between 5% and 75%, preferably between 5% and 70%, preferably between 5% and 65%, particularly preferably advantageously between 5% and 60%, preferably between 10% and 60%, advantageously between 15% and 60%, preferably between 20% and 60%, preferably between 25% and 60%, particularly advantageously between 25% and 55%, preferably between 30% and 55%.
- this separator having a particular geometry makes it possible, on the one hand, to further optimize the flow of the cooling liquid passing through the central opening where it passes between the pillar and the edge of the separator and on the other hand accelerate the coolant as it passes through the heat exchange space.
- the edge of the separator in this particular embodiment, has a complementarity of shape with the thinned portion of the central pillar. This complementary form between these two elements is particularly advantageous for accompanying the cooling liquid during its rotation of about 180 ° in the central opening thus avoiding any turbulence in the liquid and maintain a good contact with the pillar serving as "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 cooling liquid, taken perpendicular to the longitudinal axis L of the nose, in the central opening, between the front of the separator and the outer surface of the thinned portion I of the pillar.
- This 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 advantageously between 50% and 130%, preferably between 60% and 120%, advantageously between 60% and 110%, and between 70% and 110%.
- the invention advantageously further comprises a deflector substantially in 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 ducts.
- the axes of revolution of the outlet ducts for the stirring gas are oriented obliquely with respect to a longitudinal axis of the lance nose.
- said thinned portion 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 thereby increased with respect to the same surface of the heat front from the bath, without causing swirling or cavitation in the liquid.
- the passage section of the liquid in the heat exchange space is such that the coolant has a suitable speed profile so that the cooling of the front wall exposed to the bath is further improved.
- the aforesaid elements of the lance nose according to the present invention are made separately and fixed in mutual attachment 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 filled. These elements are then fixed together by high-energy welding, preferably by electron beam. This type of welding ensures copper-steel junctions easily achievable and having a good liquid tightness and this despite fatigue constraints due to successive thermal cycles to which the nose is subjected.
- the third end wall and the pillar of the lance nose according to the present invention may be made of wrought copper which provides better thermal conductivity than cast copper.
- Figure 1 is a front view of a lance nose.
- FIG. 2 illustrates a sectional view along line II-II of FIG.
- Figure 1 a particular embodiment of the lance nose according to the invention.
- FIG. 3 represents a detail of the pillar of a lance nose according to the invention.
- Figure 4 shows a particular embodiment of the lance nose according to the present invention.
- FIG. 5 represents a detail of a lance nose according to the invention, to illustrate the measurement mode of the parameters necessary for an advantageous embodiment of the invention.
- FIG. 1 illustrates the third end 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 end wall 12.
- FIG. 2 shows the lance nose according to the present invention in which the gas is fed 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 inner tube 5 is arranged coaxially around the central tube 2 so as to form between them an annular cavity 6 for supplying coolant in the direction of the Arrow F-i.
- This inner 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 outer tube 10 is arranged coaxially around the inner tube 5.
- This outer tube forms with the inner tube 5 an annular cavity 11 which serves for the outlet of the coolant in the direction of the arrow F 2 .
- This outer tube is closed by a front wall 12 which faces the bath to be stirred.
- the inner surface 30 of the third end 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 passage opening 9 provided in the front wall 7.
- an outlet duct 17 for the ejection of mixing gas outside the lance nose.
- the axes of revolution m of these ducts 17 are advantageously directed obliquely with respect to the longitudinal axis L of the lance nose.
- the cooling of the front wall 12 is ensured by the circulation of the cooling liquid in the heat exchange space 16 which is located between the separator 7 and the inner 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 along the arrow F 3 . There, it flows in the direction of the arrow F 2 outwards, that is to say towards the cavity 11.
- the lance nose shown in FIG. 2 has a pillar 18 having a first end E1 on the side of the first end wall 3 and a second end E2 connected to the central zone 14 of the inner surface 30 of the third front wall 12.
- the junction of the third end wall 12 with the pillar 18 has a continuous curved surface 19 ensuring a progressive rotation of the liquid along the arrow F 3 .
- the coolant whose disturbances are reduced, 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 by the second cavity ring 11 according to the arrow F 2 .
- the calories accumulated in the front wall 12 exposed to the bath of liquid iron are transferred to the pillar 18 whose contact surface with the coolant is increased thanks to its thinned portion curve I.
- the pillar 18 advantageously has a second portion II of predetermined length L2 joining said thinned portion I and said first end E1, said second portion II having a circular cross section defined by a predetermined diameter D2, constant over the entire length L2 , such that the ratio D 2 / D e t is a reference between 10% and 15%.
- the outside diameter Dext of the lance nose 1 according to the present invention corresponds to the diameter measured between the external surfaces of the outer tube 10.
- the volume occupied by the pillar 18 in the spear nose is important which allows to create what is called a "cold well".
- the pillar 18 is advantageously made of a material of good thermal conductivity, heat from the bath and transmitted to the third end wall 12 and its central zone 14, can then be driven by the pillar 18 to the internal parts of the nose.
- the cooling liquid circulating around this pillar 18 makes it possible to ensure a constant capture of the heat of 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 that provides better thermal conductivity than cast copper.
- the first part I of the pillar 18 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 portion I is further characterized by a predetermined diameter D1 which varies gradually 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 E2 end of the pillar 8.
- the diameter D1 of the thinned portion I of the pillar 18 therefore decreases progressively as one moves along the longitudinal axis L of the lance nose to 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 inner surface 30 of the third end wall 12.
- the second end E2 thus corresponds to the minimum diameter section D3 of the thinned portion I of the pillar 18.
- This minimum diameter section D3 of the thinned portion 1 of the pillar 18 is connected to the central zone 14 of the inner wall 30 of the third end wall 12.
- the thinned portion I also has a predetermined length
- the ratio L1 / D ext is between 15% and 25%.
- the continuous curved surface 19 between the thinned portion I of the pillar 18 and the central zone 14 of the inner 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 II of Pillar 18.
- the pillar 18 is monobloc.
- the separator 7 has the central opening 8 an edge 20 in axial section which is curved such that a height H3 is defined between a front 21 of said edge 20 and said inner surface 30 of the third end 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 in FIG. 4.
- the separator 7 is substantially plane and substantially parallel to the third end wall 12.
- the curvature of the edge 20 of the separator 7 has the advantage of accompanying the cooling liquid during its convergence in the central opening 8.
- the reduced disturbance coolant and reduced cavitation phenomenon can then calmly enter the heat exchange space 16 before emerging from the nose by the second annular cavity 11 following the arrow F 2 .
- the height H1 is measured, parallel to the axis of revolution m of the injector 17, between the surface facing the bath of the separator and the inner surface 30 of the third front wall 12, the side of the opening 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 inner surface 30 of the third end wall 12, in the heat exchange space 16.
- passage section means 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 20 a thickness e1 so that the ratio e1 / D ex t is preferably between 7% and 15%.
- a thickness of the separator 7 is measured between the surface facing the first end wall and the surface facing the third end wall of the separator 7.
- the thickness e1 of the edge 20 of the separator 7 is thus measured parallel to the axis of revolution m of the injector 17, in the continuity of 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, in combination with the curvature of the edge 20, allows a reduced disturbance flow to be maintained and a good acceleration of the coolant.
- the bath facing surface of the separator 7 is substantially sinusoidal. This means that the bath-facing surface of the separator 7 has a minimum thickness substantially its center. Consequently, the heat exchange space 16 has besides a height H1 at the central opening 8, a maximum height H max substantially in the center of the separator 7. This maximum height to, inter alia, as a consequence of reducing the losses during the second contouement of the injectors 17 in the heat exchange space 16. before its passage in the second annular cavity 11.
- a deflector 22 may be placed in the center of the stir gas supply tube 2. This deflector 22 makes it possible to appropriately divert the oxygen leaving the central pipe 2 to engage in the outlet ducts 17.
- FIG. 5 represents a detail of the central zone 14 of the inner 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 may have a height h measured between the tangent plane 32 of the inner surface 30 of the third end 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 part thinned l of pillar 18.
- the base b is located in the tangent plane 32 of the inner surface 30 of the third end wall. It is circumscribed by the points of intersection 33 with the extension of the inner surface 30 of the third end wall 12.
- the nose according to the present invention has a ratio h / (b-D3) of between 50% and 80%.
- FIG. 5 also represents the distance R2 for the passage of the coolant taken perpendicularly to the longitudinal axis L of the nose between the front 21 of the separator and the external surface of the thinned portion 1 of the pillar 22.
- This passage section is such that that the ratio R2 / H3 is preferably between 70% and 110%.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
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- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
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 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3443132A1 true EP3443132A1 (fr) | 2019-02-20 |
EP3443132B1 EP3443132B1 (fr) | 2020-05-20 |
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EP17722381.5A Active EP3443132B1 (fr) | 2016-04-15 | 2017-04-13 | Nez de lance de soufflage |
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EP (1) | EP3443132B1 (fr) |
BE (1) | BE1023582B1 (fr) |
WO (1) | WO2017178611A1 (fr) |
Family Cites Families (9)
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 |
-
2016
- 2016-04-15 BE BE2016/5264A patent/BE1023582B1/fr active
-
2017
- 2017-04-13 EP EP17722381.5A patent/EP3443132B1/fr active Active
- 2017-04-13 WO PCT/EP2017/058981 patent/WO2017178611A1/fr active Application Filing
Also Published As
Publication number | Publication date |
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BE1023582B1 (fr) | 2017-05-09 |
WO2017178611A1 (fr) | 2017-10-19 |
EP3443132B1 (fr) | 2020-05-20 |
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