Oxygen lance nozzle lower section and oxygen lance nozzle

Abstract

The oxygen lance spray head lower section comprises a disc-shaped spray head lower section body, peripheral oxygen blowing holes are formed in the spray head lower section body, and the peripheral oxygen blowing holes are sequentially formed in the circumferential direction of the spray head lower section body. Each peripheral oxygen blowing hole comprises a straight pipe part and a horn mouth arranged between the outlet end of the straight pipe part and the outer end face of the nozzle lower section body, the inner diameter of the horn mouth is gradually increased in the direction away from the straight pipe part, the included angle between the generatrix of the horn mouth and the axis of the peripheral oxygen blowing hole ranges from 40 degrees to 50 degrees, and the length of the horn mouth in the axis direction of the peripheral oxygen blowing hole ranges from 4 mm to 6 mm. The horn mouths are formed in the outlet ends of the peripheral oxygen blowing holes of the lower section of the oxygen lance nozzle, so that oxygen can be diffused outwards along the horn mouths, the oxygen jet flow surface can be expanded, jet flows of the adjacent peripheral oxygen blowing holes intersect, a protective gas layer can be formed, molten steel and slag are prevented from being attached to the oxygen lance nozzle, the oxygen lance nozzle is prevented from being burnt out, the oxygen lance replacement frequency is reduced, and the oxygen lance replacement efficiency is improved. The service life of the oxygen lance nozzle is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of steel smelting equipment, in particular to an oxygen lance nozzle lower section and an oxygen lance nozzle. Background Art

[0002] The oxygen lance is one of the main process equipment in oxygen converter steelmaking. Its performance characteristics directly affect the smelting effect and blowing time, thereby affecting the quality and output of steel. Among them, the process parameters and structural design of the oxygen lance nozzle have an important influence on the speed and distribution of the oxygen jet when it reaches the molten pool surface.

[0003] The inventor also found during the use of the oxygen lance that during the converter steelmaking process, molten steel and slag are splashed due to oxygen injection and often adhere to the lower end face of the oxygen lance nozzle. When the lance sticking is not serious, the slag can be scraped off. When the lance sticking is serious, the lower end face of the oxygen lance nozzle may be burned, affecting the jet angle and accuracy of the oxygen blowing hole. Not only does the nozzle need to be replaced frequently, but it also has a great impact on the smelting and decarburization efficiency of steel.

[0004] Therefore, how to extend the service life of the oxygen lance nozzle and thus ensure the smelting rhythm is an urgent problem that needs to be solved. Utility Model Content

[0005] The utility model aims to provide an oxygen lance nozzle lower section and an oxygen lance nozzle, which can alleviate the problem that molten steel and slag splash and adhere to the lower end surface of the oxygen lance nozzle due to oxygen injection.

[0006] The embodiment of the utility model is achieved as follows:

[0007] In the first aspect, the utility model provides an oxygen lance nozzle lower section, comprising a disc-shaped nozzle lower section body, the nozzle lower section body is provided with peripheral oxygen blowing holes, the peripheral oxygen blowing holes are arranged in sequence along the circumference of the nozzle lower section body, the peripheral oxygen blowing holes include a straight pipe portion and a bell mouth, the bell mouth is arranged between the outlet end of the straight pipe portion and the outer end surface of the nozzle lower section body, the inner diameter of the bell mouth gradually increases in the direction away from the straight pipe portion, the angle between the generatrix of the bell mouth and the axis of the peripheral oxygen blowing hole is 40°-50°, and the length of the bell mouth along the axis direction of the peripheral oxygen blowing hole is 4mm-6mm.

[0008] In an optional embodiment, the included angle between the generatrix of the bell mouth and the axis of the peripheral oxygen blowing holes is 45°-50°, and the length of the bell mouth along the axis of the peripheral oxygen blowing holes is 4.8 mm-5.2 mm.

[0009] In an optional embodiment, a straight tube oxygen blowing hole is further provided in the middle of the lower section body of the nozzle, and the axis of the straight tube oxygen blowing hole is coaxially arranged with the lower section body of the nozzle.

[0010] In an optional embodiment, a cooling water diversion portion is further provided on the inner side of the lower section of the nozzle body, and the cooling water diversion portion gradually bulges inwardly in a direction approaching the center.

[0011] In an optional embodiment, there are 4-6 peripheral oxygen blowing holes.

[0012] In an optional embodiment, the nozzle lower section body is a part of a spherical surface, and the angle between the axis of the peripheral oxygen blowing holes and the axis of the nozzle lower section body is 12°-16°.

[0013] In a second aspect, the utility model provides an oxygen lance nozzle, comprising the oxygen lance nozzle lower section as described in any one of the aforementioned embodiments.

[0014] The beneficial effects of the embodiments of the utility model are:

[0015] The outlet ends of the peripheral oxygen blowing holes in the lower section of the oxygen lance nozzle provided in the present application are provided with bell mouths, so that oxygen can diffuse outward along the bell mouths, thereby expanding the oxygen jet surface. The jets of adjacent peripheral oxygen blowing holes intersect to form a protective gas layer, giving splashing molten steel and slag an outward impact force, pushing the molten steel and slag away from the outer surface of the lower end of the oxygen lance nozzle, thereby reducing the contact between the oxygen lance nozzle and the splashing molten steel and slag, avoiding the oxygen lance nozzle from adhering to the molten steel and slag, avoiding the oxygen lance nozzle from being burned, reducing the frequency of oxygen lance replacement, and extending the service life of the oxygen lance nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of the first embodiment of the utility model;

[0018] Figure 2 This is a schematic structural diagram of the third embodiment of the utility model;

[0019] Figure 3 for Figure 2 A cross-sectional view of

[0020] Figure 4 It is a cross-sectional view of the fourth embodiment of the utility model.

[0021] Icons: 100- nozzle lower body; 110- peripheral oxygen blowing holes; 111- straight tube; 112- bell mouth; 120- straight tube oxygen blowing holes; 130- cooling water diversion section. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0025] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0026] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0027] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] First embodiment

[0029] Please refer to Figure 1 The present embodiment provides an oxygen lance nozzle lower section, comprising a disc-shaped nozzle lower section body 100, the nozzle lower section body 100 is provided with peripheral oxygen blowing holes 110, the peripheral oxygen blowing holes 110 are arranged in sequence along the circumference of the nozzle lower section body 100, the peripheral oxygen blowing holes 110 include a straight pipe portion 111 and a bell mouth 112, the bell mouth 112 is arranged between the outlet end of the straight pipe portion 111 and the outer end surface of the nozzle lower section body 100, the inner diameter of the bell mouth 112 gradually increases in the direction away from the straight pipe portion 111, the angle between the generatrix of the bell mouth 112 and the axis of the peripheral oxygen blowing hole 110 is 40°-50°, and the length of the bell mouth 112 along the axis direction of the peripheral oxygen blowing hole 110 is 4mm-6mm.

[0030] The oxygen lance nozzle lower section body 100 provided in the present embodiment mainly includes an end face on which peripheral oxygen blowing holes 110 are arranged. In the present embodiment, the peripheral oxygen blowing holes 110 are evenly distributed on the nozzle lower section body 100 along the circumferential direction. The outlet ends of the peripheral oxygen blowing holes 110 are provided with bell mouths 112, so that oxygen can diffuse outward along the bell mouths 112, thereby expanding the oxygen jet surface. The jets of adjacent peripheral oxygen blowing holes 110 intersect to form a protective gas layer, giving the splashing molten steel and slag an outward impact force, pushing the molten steel and slag away from the outer surface of the lower end of the oxygen lance nozzle, thereby reducing the contact between the oxygen lance nozzle and the splashing molten steel and slag.

[0031] Specifically, the angle between the inner wall of the bell mouth 112 and the axis of the peripheral oxygen blowing hole 110 in this embodiment is 40°-50°, for example, it can be 40°, 42°, 44°, 46°, 48°, 50° or any value between 40°-50°, any value between 40°-45°, and any value between 45°-50°. If the angle between the inner wall of the bell mouth 112 and the axis of the peripheral oxygen blowing hole 110 is too large, for example, exceeding 50°, the jet blown out of the peripheral oxygen blowing hole 110 will impact the furnace wall to a certain extent, damage the furnace lining, cause the blowing to stop, affect the steelmaking efficiency, and affect the subsequent continuous casting and drawing; and when the angle between the inner wall of the bell mouth 112 and the axis of the peripheral oxygen blowing hole 110 is too small, for example, less than 40°, the oxygen lance jet covers a small range of the slag interface, and the reaction surface is relatively small, which is not conducive to the full reaction.

[0032] The length of the bell mouth 112 in the present embodiment along the axis direction of the peripheral oxygen blowing hole 110 is 4mm-6mm, for example, it can be 4mm, 4.5mm, 5mm, 5.5mm, 6mm or any value between 4mm-6mm, any value between 4mm-5mm, and any value between 5mm-6mm. If the length of the bell mouth 112 along the axis direction of the peripheral oxygen blowing hole 110 is too long, the inner diameter of the outlet end of the bell mouth 112 is larger, and the oxygen flow rate blown out of the peripheral oxygen blowing hole 110 is relatively slow, so the oxygen impact on the metal molten pool in the furnace cannot reach a reasonable impact depth, thereby affecting the effect of molten steel decarburization or rapid slag dephosphorization; but if the length of the bell mouth 112 along the axis direction of the peripheral oxygen blowing hole 110 is too short, the oxygen leaves the bell mouth 112 before it is stabilized, which will also affect the coverage of the protective gas layer and the resistance effect on the molten steel and slag.

[0033] It should be noted that the size of the oxygen lance nozzle in this embodiment is matched with the size of the converter, and the size of the peripheral oxygen blowing holes 110 is matched with the size of the lower end of the oxygen lance nozzle. Usually, if the size of the converter is larger, the size of the oxygen lance used is also relatively larger, and the size of the peripheral oxygen blowing holes 110 provided on the oxygen lance is also relatively larger; conversely, if the size of the converter is smaller, the size of the oxygen lance used is also relatively small, and the size of the peripheral oxygen blowing holes 110 provided on the oxygen lance is also relatively small.

[0034] Second embodiment

[0035] Based on the first embodiment, this embodiment further defines that: the included angle between the generatrix of the bell mouth 112 and the axis of the peripheral oxygen blowing hole 110 is 45°-50°, and the length of the bell mouth 112 along the axis of the peripheral oxygen blowing hole 110 is 4.8mm-5.2mm. In some embodiments, preferably, the included angle between the inner wall of the bell mouth 112 and the axis of the peripheral oxygen blowing hole 110 is 47°, and the length of the bell mouth 112 along the axis of the peripheral oxygen blowing hole 110 is 5mm.

[0036] Third embodiment

[0037] Based on the first embodiment, this embodiment further defines that: a straight pipe oxygen blowing hole 120 is further provided in the middle of the nozzle lower section body 100, and the axis of the straight pipe oxygen blowing hole 120 is coaxially arranged with the nozzle lower section body 100, such as Figure 2 and Figure 3 shown.

[0038] The straight tube oxygen blowing hole 120 in this embodiment is coaxially arranged with the lower section body 100 of the nozzle. The straight tube oxygen blowing hole 120 located in the middle of the lower section body 100 of the nozzle can suppress the generation of a negative pressure zone directly below the oxygen gun, increase the oxygen enrichment capacity of the slag interface, improve the stirring efficiency, and shorten the blowing time.

[0039] Fourth embodiment

[0040] Based on the first embodiment, this embodiment further defines that: a cooling water diversion portion 130 is further provided inside the lower section body 100 of the nozzle, and the cooling water diversion portion 130 gradually bulges inwardly along the direction close to the center, such as Figure 4 shown.

[0041] The oxygen ejected from the oxygen lance needs to be cooled down, so cooling water is provided around the peripheral oxygen blowing holes 110 to absorb the heat conducted and radiated from the slag steel to the oxygen lance body. In order to facilitate the circulation of the cooling water, a cooling water branch section 130 is provided so that the cooling water gradually approaches the peripheral oxygen blowing holes 110 along the cooling water branch section 130 to effectively cool various parts of the oxygen lance.

[0042] Fifth embodiment

[0043] Based on the first embodiment, this embodiment further defines that: there are 4-6 peripheral oxygen blowing holes 110, specifically 4, 5 or 6. In this embodiment, 5 peripheral oxygen blowing holes 110 are arranged along the axial direction, and a straight tube oxygen blowing hole 120 is also arranged in the middle, with a total of 6 holes that can be used to spray oxygen.

[0044] Sixth embodiment

[0045] Based on the first embodiment, this embodiment further defines that: the nozzle lower section body 100 is a part of a sphere, and the angle between the axis of the peripheral oxygen blowing hole 110 and the axis of the nozzle lower section body 100 is 12°-16°, specifically, it can be 12°, 13°, 14°, 15°, 16° or any value between 12°-16°.

[0046] The nozzle lower body 100 in this embodiment is a part of a sphere, and the radius of the sphere can be selected according to the size of the oxygen lance. When the required size of the oxygen lance is larger, the radius of the sphere is also relatively larger; when the required size of the oxygen lance is smaller, the radius of the sphere is also relatively smaller.

[0047] If the angle between the axis of the peripheral oxygen blowing holes 110 and the axis of the lower section body 100 of the nozzle is too large, the jets blown out of the peripheral oxygen blowing holes 110 will impact the furnace wall to a certain extent, damage the furnace lining, cause blowing to stop, affect the steelmaking efficiency, and affect the subsequent continuous casting and drawing of steel; and when the angle between the axis of the peripheral oxygen blowing holes 110 and the axis of the lower section body 100 of the nozzle is too small, the interface contact with the slag is relatively small, which is not conducive to the full reaction.

[0048] Seventh embodiment

[0049] This embodiment provides an oxygen lance nozzle, including the oxygen lance nozzle lower section described in any one of the aforementioned embodiments. Other structures, materials, etc. can be selected by those skilled in the art in the art without conflicting with the above structure.

[0050] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An oxygen lance nozzle lower section, characterized in that: It comprises a disc-shaped nozzle lower section body, on which peripheral oxygen blowing holes are arranged, and the peripheral oxygen blowing holes are arranged in sequence along the circumference of the nozzle lower section body, and the peripheral oxygen blowing holes comprise a straight pipe portion and a bell mouth, and the bell mouth is arranged between the outlet end of the straight pipe portion and the outer end surface of the nozzle lower section body, and the inner diameter of the bell mouth gradually increases in the direction away from the straight pipe portion, and the angle between the generatrix of the bell mouth and the axis of the peripheral oxygen blowing hole is 40°-50°, and the length of the bell mouth along the axis direction of the peripheral oxygen blowing hole is 4mm-6mm.

2. The lower section of the oxygen lance nozzle according to claim 1, characterized in that: The included angle between the generatrix of the bell mouth and the axis of the peripheral oxygen blowing hole is 45°-50°, and the length of the bell mouth along the axis of the peripheral oxygen blowing hole is 4.8mm-5.2mm.

3. The oxygen lance nozzle lower section according to claim 1, characterized in that: A straight tube oxygen blowing hole is also arranged in the middle of the lower section body of the nozzle, and the axis of the straight tube oxygen blowing hole is arranged coaxially with the lower section body of the nozzle.

4. The oxygen lance nozzle lower section according to claim 1, characterized in that: A cooling water diversion portion is also provided inside the lower section of the nozzle body, and the cooling water diversion portion gradually bulges inwards in a direction approaching the center.

5. The lower section of the oxygen lance nozzle according to claim 1, characterized in that: There are 4 to 6 peripheral oxygen blowing holes.

6. The oxygen lance nozzle lower section according to claim 1, characterized in that: The nozzle lower section body is a part of a spherical surface, and the angle between the axis of the peripheral oxygen blowing hole and the axis of the nozzle lower section body is 12°-16°.

7. An oxygen lance nozzle, characterized in that: It comprises the lower section of the oxygen lance nozzle as described in any one of claims 1 to 6.

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