Rotational flow oxygen lance nozzle

Abstract

The utility model relates to the technical field of ferrous metallurgy, in particular to a rotational flow oxygen lance spray head which comprises a spray head sleeve, a spray head cover and a spray head cover. The spray holes are formed in the bottom of the spray head sleeve, and the number of the spray holes is multiple; the included angle between the axis of the spray hole and the horizontal plane is angle alpha, the plane of the axis of the spray hole in the vertical direction is L1, the plane of the connecting line between the circle center of the spray hole on the inner wall of the spray head sleeve and the axis of the spray head sleeve in the vertical direction is L2, and the included angle between L1 and L2 is angle beta. In the aspect of converter splashing, the included angle alpha is formed between the spraying hole and the horizontal plane, so that jet flow ejected from the rotational flow oxygen lance nozzle cannot vertically impact a molten pool, and the included angle beta is set, so that oxygen spirally flows after being ejected from the rotational flow oxygen lance nozzle, and the motion trail of the jet flow is changed; molten steel splashing caused by impact of jet flow on a molten pool is reduced.

Description

Technical Field

[0001] This utility model relates to the field of iron and steel metallurgy technology, and in particular to a swirling oxygen lance nozzle. Background Technology

[0002] Top-blown oxygen converter steelmaking has become the most important modern steelmaking method. As a key piece of equipment in converter steelmaking, the oxygen lance nozzle is crucial for achieving supersonic oxygen jets. It injects oxygen into the converter, participating in various metallurgical reactions such as decarburization, heating, and impurity removal, playing a vital and decisive role in various technical indicators during converter smelting. Since the advent of the top-blown oxygen converter, the development of top-blown oxygen lance nozzles has progressed from single-hole to multi-hole, straight-hole to Laval type, solid forging to center-water-cooled casting, single oxygen supply type to post-combustion type that can increase the scrap ratio, and multi-functional oxygen lances capable of injecting carbon powder or other powders. The continuous improvement and refinement of oxygen lance nozzles has greatly advanced the development of converter smelting technology.

[0003] Currently, molten steel splashing is a common phenomenon in converter steelmaking during the iron and steel smelting process. Preventing and reducing splashing can improve metal yield and extend the service life of the oxygen lance. The impact force of the oxygen jet is the main cause of splashing of molten metal droplets and slag. Existing oxygen lance jets exhibit overlap between adjacent streams, significantly increasing the impact intensity on the molten pool in the overlap area, resulting in intense splashing. To reduce splashing, existing oxygen lances typically use a larger tilt angle to avoid jet overlap and thus reduce converter splashing. However, excessively increasing the tilt angle causes the oxygen nozzles to face further towards the converter sidewall, exacerbating the wear of the furnace wall refractory material.

[0004] Therefore, this application provides a swirling oxygen lance nozzle. Utility Model Content

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, this utility model provides a swirling oxygen lance nozzle, thereby solving the technical problem that when the existing oxygen lance adopts a large tilt angle to avoid jet stream overlap and reduce converter splashing, the excessive increase in tilt angle aggravates the wear of the furnace wall refractory material.

[0006] To achieve the above objectives, this utility model provides a swirling oxygen lance nozzle, comprising: a nozzle sleeve; a nozzle orifice, formed at the bottom of the nozzle sleeve, wherein the number of nozzle orifices is multiple; the angle between the nozzle orifice axis and the horizontal plane is ∠α, the plane in the vertical direction of the nozzle orifice axis is L1, the plane in the vertical direction of the line connecting the center of the nozzle orifice on the inner wall of the nozzle sleeve and the nozzle sleeve axis is L2, and the angle between L1 and L2 is ∠β.

[0007] Optionally, the nozzle sleeve includes: a first cylinder; a second cylinder, sleeved outside the first cylinder, with a first gap between the first cylinder and the second cylinder; and a third cylinder, sleeved outside the second cylinder, with a second gap between the second cylinder and the third cylinder.

[0008] Optionally, the bottom wall of the first cylinder is concave, with the concave direction facing the bottom wall of the second cylinder.

[0009] Optionally, the first, second, and third cylinders can all be cylindrical.

[0010] The options are ∠α = 75°-80° and ∠β = 9°-13°.

[0011] Optionally, multiple nozzles are evenly spaced on the bottom wall of the nozzle sleeve.

[0012] The number of nozzles can be selected from 3 to 6.

[0013] The beneficial effects of this utility model are:

[0014] This invention provides a swirling oxygen lance nozzle. In terms of converter splashing, by creating an angle (∠α) between the nozzle and the horizontal plane, the jet ejected from the swirling oxygen lance nozzle will not vertically impact the molten pool. Furthermore, by setting an angle (∠β), the oxygen ejected from the swirling oxygen lance nozzle flows in a spiral shape. During the swirling flow of the jet, the jet velocity decreases rapidly, further reducing the impact intensity of the jet. This reduces the impact intensity on the molten pool surface, lowers the splashing intensity of the molten steel, and also avoids excessively increasing the nozzle tilt angle, which would increase the wear on the furnace wall refractory material.

[0015] Furthermore, since the nozzle is set with an included angle ∠β, the jet has a velocity component in the tangential direction, which enables the molten steel to rotate in the circumferential direction, thereby promoting the flow inside the molten pool, improving the stirring effect of the molten pool, strengthening the metallurgical reaction in the converter, and promoting the forward decarburization reaction.

[0016] Furthermore, due to the reduced aggregation of oxygen jets in the swirl oxygen lance nozzle and better jet independence, the pits generated after impacting the molten pool are more dispersed, the distance between adjacent pits increases, and the molten pool has a more reasonable pit shape, which is conducive to the converter obtaining good refining efficiency.

[0017] Furthermore, the decrease in the jet center velocity and the increase in the radial velocity of the swirl oxygen lance reduce the impact intensity of the jet on the molten pool, but increase the impact width, thereby increasing the interaction area between the jet generated by the swirl oxygen lance and the molten pool. This is beneficial for promoting the slag-gold reaction and improving the dephosphorization effect in the early stage of converter smelting. Attached Figure Description

[0018] Figure 1 This is a cross-sectional schematic diagram of the swirl oxygen lance nozzle of this utility model;

[0019] Figure 2 This is a three-dimensional cross-sectional schematic diagram of the swirl oxygen lance nozzle of this utility model;

[0020] Figure 3 This is a bottom view schematic diagram of the swirl oxygen lance nozzle of this utility model;

[0021] Figure 4 This is a top view schematic diagram of the swirl oxygen lance nozzle of this utility model.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Nozzle sleeve; 2. Nozzle hole; 3. First cylinder; 4. Second cylinder; 5. Third cylinder; 6. Water passage hole. Detailed Implementation

[0024] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0025] Example:

[0026] An embodiment of this utility model provides a swirling oxygen lance nozzle, such as... Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, it includes: a nozzle sleeve 1; nozzles 2, which are opened at the bottom of the nozzle sleeve 1, and there are multiple nozzles 2; the angle between the axis of the nozzle 2 and the horizontal plane is ∠α, the plane in the vertical direction of the axis of the nozzle 2 is L1, the plane in the vertical direction of the line connecting the center of the nozzle 2 on the inner wall of the nozzle sleeve 1 and the axis of the nozzle sleeve 1 is L2, and the angle between L1 and L2 is ∠β.

[0027] For example, the nozzle 2 extends through the nozzle sleeve 1 from the bottom, connecting the inside and outside of the nozzle sleeve 1, thereby enabling oxygen to be injected from the inside of the nozzle sleeve 1 to the outside of the nozzle sleeve 1, thus satisfying the use of the swirl oxygen gun nozzle to inject oxygen.

[0028] For example, since the included angle between L1 and L2 is defined as ∠β, the axis of the nozzle 2 and the axis of the nozzle sleeve 1 are neither coplanar nor intersecting. This included angle ∠β causes the oxygen to flow in a spiral shape after being ejected from the swirling oxygen lance nozzle. During the process of the jet's rotating flow, the jet's velocity decays faster, further reducing the jet's impact intensity. This reduces the impact intensity on the molten pool surface and decreases the splashing intensity of the molten steel.

[0029] In one possible embodiment, such as Figure 1 , Figure 2 and Figure 4 As shown, the nozzle sleeve 1 includes: a first cylinder 3; a second cylinder 4, which is sleeved outside the first cylinder 3 and there is a first gap between the first cylinder 3 and the second cylinder 4; and a third cylinder 5, which is sleeved outside the second cylinder 4 and there is a second gap between the second cylinder 4 and the third cylinder 5.

[0030] For example, in this embodiment, the first gap is used to supply cooling water to the nozzle sleeve 1, such as... Figure 2 As shown, a water passage hole 6 is also provided on the bottom wall of the second cylinder 4, allowing cooling water to enter the second gap from the first gap through the water passage hole 6. Finally, the cooling water is discharged from the second gap through the top of the nozzle sleeve 1, thus cooling the nozzle sleeve 1. This arrangement also allows the cooling water to promptly remove the heat from the third cylinder 5, cooling the third cylinder 5 in a timely manner, preventing the high-temperature slag and molten steel from eroding the third cylinder 5, ensuring the structural integrity of the third cylinder 5, and thus ensuring the stability of the oxygen jet ejected from the nozzle 2.

[0031] In one possible embodiment, such as Figure 1 and Figure 2 As shown, the bottom wall of the first cylinder 3 is concave, and the concave direction faces the bottom wall of the second cylinder 4.

[0032] For example, by setting the bottom wall of the first cylinder 3 as a concave surface, after the high-pressure oxygen enters the nozzle sleeve 1, the high-pressure oxygen impacts the bottom wall of the concave surface. The impact energy of the high-pressure oxygen will not be completely lost due to the obstruction of the bottom wall of the first cylinder 3. The high-pressure oxygen can be diverted along the concave surface to multiple nozzles 2, which is conducive to the high-pressure oxygen continuing to maintain its own impact intensity.

[0033] In one possible embodiment, such as Figure 1 , Figure 2 and Figure 4 As shown, the first cylinder 3, the second cylinder 4, and the third cylinder 5 are all cylindrical cylinders.

[0034] For example, since the swirl oxygen gun nozzle sprays high-pressure oxygen, the first cylinder 3, the second cylinder 4 and the third cylinder 5 are all set as cylindrical cylinders, which can enable the nozzle sleeve 1 to withstand greater internal pressure as a whole, thereby extending the service life of the nozzle sleeve 1.

[0035] In one possible embodiment, such as Figure 2 and Figure 4 As shown, ∠α is 75°-80°, and ∠β is 9°-13°.

[0036] For example, this embodiment specifically defines the angle ∠α between the nozzle 2 and the horizontal plane as 75°-80°. By setting the angle ∠α, the jet ejected from the swirling oxygen lance nozzle will not impact the molten pool perpendicularly, thereby reducing the splashing of molten steel caused by the jet impacting the molten pool. This embodiment also defines the angle ∠β as 9°-13°, so that the oxygen flows in a spiral shape after being ejected from the swirling oxygen lance nozzle. During the jet's rotating flow, the jet's velocity decreases more rapidly, further reducing the jet's impact intensity. This reduces the impact intensity on the molten pool surface and decreases the splashing intensity of the molten steel.

[0037] In one possible embodiment, such as Figure 3 As shown, multiple nozzles 2 are evenly spaced on the bottom wall of the nozzle sleeve 1.

[0038] For example, since the multiple nozzles 2 are evenly spaced, that is, the spacing between the multiple nozzles 2 is the same, and the distance between each nozzle 2 and the side wall of the first cylinder 3 is also the same, this arrangement allows the jet ejected from each nozzle 2 to be evenly directed toward the molten pool in the circumferential direction, which is more conducive to generating a rotating flow of molten steel in the circumferential direction, thereby promoting the flow inside the molten pool, improving the stirring effect of the molten pool, strengthening the metallurgical reaction in the converter, and promoting the forward decarburization reaction.

[0039] In one possible embodiment, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the number of nozzles 2 is 3 to 6.

[0040] For example, if the number of nozzles 2 is too small, the impact intensity of the oxygen jet on the molten pool will be too high, resulting in a large splashing intensity of molten steel within the pool. Conversely, if the number of nozzles 2 is too large, on the one hand, the swirling oxygen lance will not be able to generate sufficient impact intensity, leading to a decrease in the stirring intensity of the molten steel. On the other hand, it will also cause the coalescence of the swirling oxygen lance jet to increase again, thus failing to guarantee the independence of the jet. This results in the pits generated after the jet impacts the molten pool becoming too concentrated, increasing the velocity of the molten steel between the pits. The molten steel then gains sufficient kinetic energy to detach from the liquid surface, thereby forming droplet splashing.

[0041] Therefore, in this embodiment, the number of nozzles 2 is set to 3-6, which ensures that the oxygen jet has a suitable impact and stirring intensity on the molten pool, and effectively avoids the coalescence of the jet from the swirling oxygen lance nozzle from increasing again. This allows the swirling oxygen lance in this embodiment to effectively ensure the independence of the oxygen jet, making the pits generated by the oxygen jet impacting the molten pool more dispersed, reducing the velocity of the molten steel between the pits, and preventing the molten steel from gaining enough kinetic energy to escape from the liquid surface, thereby avoiding droplet splashing.

[0042] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0043] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0044] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A swirl oxygen lance nozzle, characterized by, Comprise: A nozzle sleeve; A plurality of spray holes are arranged on the bottom of the nozzle sleeve; The angle between the spray hole axis and the horizontal plane is ∠α, the plane of the spray hole axis in the vertical direction is L1, the line between the center of the spray hole on the inner wall of the nozzle sleeve and the nozzle sleeve axis in the vertical direction is L2, the angle between L1 and L2 is ∠β, and the ∠β is 9-13°; The nozzle sleeve comprises: A first cylinder; A second cylinder is sleeved outside the first cylinder, and there is a first gap between the first cylinder and the second cylinder; A third cylinder is sleeved outside the second cylinder, and there is a second gap between the second cylinder and the third cylinder; The bottom wall of the first cylinder is concave, and the direction of the concave is towards the bottom wall of the second cylinder; A water passing hole is arranged on the bottom wall of the second cylinder, and the height of the first cylinder, the second cylinder and the third cylinder at the high-pressure oxygen inlet end is the same.

2. The swirl oxygen lance nozzle of claim 1 wherein, The first cylinder, the second cylinder and the third cylinder are all cylindrical cylinders.

3. The swirl oxygen lance nozzle of claim 1 wherein, The ∠α is 75-80°.

4. The swirl oxygen lance nozzle of claim 1 wherein, A plurality of spray holes are uniformly distributed on the bottom wall of the nozzle sleeve.

5. The swirl oxygen lance injector as claimed in any one of claims 1 to 4, wherein The number of spray holes is 3-6.

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