Converter bottom blowing element and preparation method thereof, converter

Abstract

The application discloses a converter bottom blowing element and a preparation method thereof and a converter, and belongs to the technical field of mechanical equipment, to solve the technical problem that the current sleeve is stressed and tilted, leading to uneven stress on the sleeve and damage, wherein the outer sleeve, the inner sleeve and the inner core of the bottom blowing element are concentrically arranged, the outer sleeve inner wall is provided with a first boss, the inner sleeve is provided with a first groove and a second boss, and the inner core is provided with a second groove, wherein the first boss and the first groove are matched with each other, and the second boss and the second groove are matched with each other, so that the outer sleeve and the inner sleeve and the inner sleeve and the inner core are fixed with each other, thereby stabilizing the concentricity of the outer sleeve, the inner sleeve and the inner core.

Description

Technical Field

[0001] This application belongs to the technical field of mechanical equipment, and in particular relates to a converter bottom blowing element and its preparation method, and a converter. Background Technology

[0002] The top-bottom combined blowing process, also known as the combined blowing process, refers to a process in which oxygen is supplied from above the converter molten pool (top-blown oxygen) and inert gas or nitrogen is supplied from the bottom of the converter, with blowing occurring simultaneously at both the top and bottom. Currently, the vast majority of large and medium-sized converters adopt the combined blowing process.

[0003] In related technologies, bottom-blown powder spraying elements typically have two structures: The first type uses a central sleeve with an outer annular slit. Powder and conveying gas are sprayed from the central sleeve, while cooling and protective gases pass through the annular slit. The central sleeve has a relatively large diameter, making it prone to generating large bubbles during spraying, which exert a strong reaction force on the element and shorten its lifespan. The second type is a double-annular slit structure, employing a three-layer design. The center is a solid cylindrical core, with the inner and outer sleeves forming inner and outer annular slits. Material and conveying gas flow between the inner annular slits, while cooling and protective gases flow through the outer annular slit.

[0004] In daily use, if the sleeve is subjected to a large force from the blower, it will tilt, resulting in uneven stress on the sleeve and deviation in the concentricity of the sleeve, which will damage the element and reduce its service life. Summary of the Invention

[0005] This application aims to at least partially solve the technical problem of uneven stress and damage to the current double-layer circumferential-slit element sleeve after it tilts under stress. To this end, this application provides a converter bottom-blowing element, its preparation method, and the converter itself.

[0006] This application provides an embodiment of a converter bottom-blowing element and its preparation method, and a converter, including: The outer tube has a first protrusion on its inner wall; An inner sleeve is coaxially disposed inside the outer sleeve. The outer wall of the inner sleeve is provided with a first groove that matches the first boss, and the inner wall of the inner sleeve is provided with a second boss. There is a first annular gap between the outer sleeve and the inner sleeve for cooling gas to flow. The inner core is coaxially disposed inside the inner sleeve. The outer wall of the inner core is provided with a second groove that matches the second boss. There is a second annular gap between the inner sleeve and the inner core for the flow of dephosphorization powder and carrier gas.

[0007] In some embodiments, multiple first protrusions and multiple first grooves are provided, with multiple first protrusions and multiple first grooves corresponding one-to-one, and multiple first protrusions being spaced apart. The second protrusion and the second groove are provided in multiple ways, and the multiple second protrusions and the multiple second grooves correspond one-to-one, with the multiple second protrusions spaced apart.

[0008] In some embodiments, both the first boss and the second boss are provided with through vent holes.

[0009] In some embodiments, the dimension of the first groove along the circumferential direction of the inner core is equal to that of the first boss, which is d2= ~ Where, l2 is the outer circumference of the inner sleeve; The first groove has a radial dimension h3 along the inner core. ~ ; The first boss has a radial dimension along the inner core of h4 = h3 + k2, where k2 is the radial dimension of the first circumferential seam along the inner core. The second groove has the same circumferential dimension as the second boss along the inner core, which is d1= ~ Where l1 is the circumference of the inner core; The second groove has a radial dimension h1 along the inner core. ~ ; The second boss has a radial dimension h2 = h1 + k1 along the inner core, where k1 is the radial dimension of the second annular seam along the inner core.

[0010] In some embodiments, the converter bottom blowing element further includes a conveying section connected to the outer sleeve and the inner sleeve. The conveying section has a conveying cavity communicating with the second annular gap. One end of the inner core extends out of the inner sleeve, and the portion of the inner core extending out of the inner sleeve forms a guide section, which is located inside the conveying cavity.

[0011] In some embodiments, the radial dimension of the delivery cavity decreases sequentially in the direction away from the inner core.

[0012] In some embodiments, the conveying cavity is a cone shape coaxial with the inner core, wherein the cone angle of the conical conveying cavity is... and the stationary angle of the dephosphorized powder Satisfying the relation .

[0013] In some embodiments, the converter bottom blowing element further includes a cooling gas delivery pipe connected to the outer sleeve, and the first circumferential slit is closed on the side of the furnace cavity away from the converter.

[0014] Based on the same inventive concept, this application also provides a converter, including a furnace body and a converter bottom blowing element as described in any one of claims 1-8, wherein the converter bottom blowing element is connected to the furnace body.

[0015] Based on the same inventive concept, this application also provides a method for preparing a converter bottom blowing element, comprising: The inner core is obtained by isostatic pressing of fused magnesium oxide with a particle size of 0~0.5mm. Silicon carbide powder is mixed with water to form a slurry. The slurry is then introduced into an outer sleeve mold and an inner sleeve mold, and after demolding, the inner sleeve and the outer sleeve are obtained. The outer sleeve, the inner sleeve, and the inner core are assembled to obtain the converter bottom blowing element.

[0016] In this embodiment, the outer sleeve, inner sleeve, and inner core of the bottom blowing element are concentrically arranged. The inner wall of the outer sleeve is provided with a first protrusion, the inner sleeve is provided with a first groove and a second protrusion, and the inner core is provided with a second groove. The first protrusion and the first groove cooperate with each other, and the second protrusion and the second groove cooperate with each other, so that the outer sleeve and the inner sleeve, and the inner sleeve and the inner core are fixed together. When the bottom blowing element is used to blow carrier gas and dephosphorization powder, even if the force of the blowing is large, the outer sleeve, the inner sleeve, and the inner core can maintain a stable concentricity and will not tilt. This avoids damage caused by uneven force on the outer sleeve, the inner sleeve, and the inner core, thereby improving the service life of the bottom blowing element. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a converter bottom blowing element according to the present invention; Figure 2 This is a top view of a converter bottom blowing element according to the present invention. Figure 3 This is a schematic diagram of the outer sleeve structure of a converter bottom blowing element according to the present invention. Figure 4 This is a schematic diagram of the inner sleeve structure of a converter bottom blowing element according to the present invention. Figure 5 This is a schematic diagram of the inner core structure of a converter bottom blowing element according to the present invention.

[0019] Figure label: 100 - Outer tube, 110 - First boss 200 - Inner sleeve, 210 - First groove, 220 - Second boss 300 - First circumferential suture, 400 - Inner core, 410 - Second groove, 420 - Flow guide section 500 - Second circumferential suture, 600 - Vent hole, 700 - Conveying section, 710 - Conveying chamber. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that all directional indications in the embodiments of this invention are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indication will also change accordingly. In this invention, unless otherwise explicitly specified and limited, the terms "connection" and "fixed" should be interpreted broadly. For example, "fixed" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction relationship between two components, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances. In addition, the descriptions involving "first," "second," etc., in this invention are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0022] This application is described below with reference to the accompanying drawings and specific embodiments: Please see Figures 1-4 This application provides a converter bottom blowing element, including an outer sleeve, an inner sleeve, and an inner core. This bottom blowing element is used for bottom oxygen blowing and bottom coal blowing in the converter.

[0023] In some embodiments, the outer tube 100 adopts a hollow columnar structure such as a rectangle or cylinder. In this embodiment, the outer tube 100 adopts a cylinder. Specifically, the outer tube 100 is a hollow cylindrical structure. A first protrusion 110 is provided on the inner wall of the outer tube 100. The first protrusion 110 is axially arranged along the outer wall of the outer tube 100. The first protrusion 110 is the same length as the outer tube 100. The outer tube 100 is made of silicon carbide powder casting. Silicon carbide has high high temperature resistance. When the converter is working, the outer tube 100 is in a high temperature environment and will not be damaged by high temperature.

[0024] The inner sleeve 200 is disposed on the outer sleeve 100. The inner sleeve 200 can be a hollow columnar structure such as a rectangle or a cylinder. In this embodiment, the inner sleeve 200 adopts a hollow cylindrical structure. The inner sleeve 200 and the outer sleeve 100 are coaxially arranged. The inner wall of the inner sleeve 200 is provided with a first groove 210 that matches the first boss 110. The first boss 110 and the first groove 210 work together to ensure that the positional relationship between the inner sleeve 200 and the outer sleeve 100 is stable after assembly. When the converter is working, the outer sleeve 100 and the inner sleeve 200 will not tilt due to the large force of the blowing, which would cause the concentricity of the outer sleeve 100 and the inner sleeve 200 to change, thereby causing the outer sleeve 100 or the inner sleeve 200 to be damaged under long-term uneven stress.

[0025] There is a first annular gap 300 between the inner sleeve 200 and the outer sleeve 100. When the converter is working, cooling gas is introduced through the first annular gap 300 to keep the temperature of the outer sleeve 100 and the inner sleeve 200 stable and prevent damage to the outer sleeve 100 and the inner sleeve 200.

[0026] The inner core 400 adopts a cylindrical structure. Specifically, the outer wall of the inner core 400 is provided with a second groove 410, which is arranged along the axial direction of the inner core 400. The second groove 410 and the inner core 400 are of equal length in the axial direction. The inner wall of the inner sleeve 200 is provided with a second boss 220 that matches the second groove 410. The inner core 400 and the inner sleeve 200 are assembled by engaging the second boss 220 and the second groove 410. The inner core 400 and the inner sleeve 200 are coaxially arranged, and a second ring is formed between the inner core 400 and the inner sleeve 200. The second annular seam 500 allows the powder required for converter smelting to pass through. When the converter is working, the inner core 400 and the inner sleeve 200 will not tilt due to the large force of the blowing, thus causing the concentricity of the inner core 400 and the inner sleeve 200 to change. This would result in the inner core 400 or the inner sleeve 200 being damaged under long-term uneven stress. The inner core 400 is made of magnesium refractory material, which gives it high temperature resistance.

[0027] In some embodiments, please refer to Figures 1-4 There are multiple first protrusions 110 and multiple first grooves 210. Each of the multiple first protrusions 110 and the multiple first grooves 210 are respectively arranged in a one-to-one correspondence. During assembly, the multiple first protrusions 110 are respectively engaged and assembled with the multiple first grooves 210. The multiple first protrusions 110 are spaced apart on the inner wall of the outer sleeve 100. The multiple first protrusions 110 and the multiple first grooves 210 work together to ensure that the positional relationship between the outer sleeve 100 and the inner sleeve 200 is stable when they are coaxially arranged. This prevents the outer sleeve 100 and the inner sleeve 200 from shifting under the action of external force, which would lead to uneven force on the outer sleeve 100 and the inner sleeve 200 during operation and damage.

[0028] The first protrusion 110 is provided in three, four or five places. The multiple first protrusions 110 are spaced apart along the axial direction of the inner core 400. The first grooves 210 are spaced apart along the axial direction of the inner core 400. In some embodiments, the multiple first protrusions 110 can be spaced apart sequentially along the circumference of the inner core 400. The second grooves 410 are spaced apart sequentially along the circumference of the inner core 400, and the second grooves 410 penetrate the axial direction of the inner core 400, which facilitates the assembly of the outer sleeve and the inner sleeve.

[0029] There are multiple second protrusions 220 and multiple second grooves 410. Each second protrusion 220 corresponds one-to-one with a second groove 410. During assembly, the second protrusions 220 engage and assemble with the corresponding second grooves 410. The second protrusions 220 are spaced apart on the inner wall of the inner sleeve 200. The cooperation of the second protrusions 220 and the second grooves 410 ensures a stable positional relationship when the inner sleeve 200 and inner core 400 are coaxially aligned. This prevents the inner core 400 and inner sleeve 200 from shifting under external forces, thus avoiding uneven stress and damage during operation. In some embodiments, please refer to Figures 1-2 One end of the first boss 110 can be set at the bottom of the inner wall of the outer sleeve 100, and the other end of the first boss 110 is set on the inner wall of the outer sleeve 100 and away from the top of the outer sleeve 100. The first groove 210 is axially arranged along the outer wall of the inner sleeve 200, and the first groove 210 and the inner sleeve 200 are of equal length in the axial direction. The outer sleeve 100 and the inner sleeve 200 can be snapped together and assembled by the first boss 110 and the first groove 210, which reduces the manufacturing cost of the outer sleeve 100. At the same time, the cooperation of the first boss 110 and the first groove 210 makes the positional relationship between the outer sleeve 100 and the inner sleeve 200 stable.

[0030] In some embodiments, please refer to Figures 1-2One end of the second protrusion 220 can be set at the bottom end of the inner wall of the inner sleeve 200, and the other end of the second protrusion 220 is set on the inner wall of the inner sleeve 200 and away from the top of the inner sleeve 200. The second groove 410 is set along the axial direction of the inner core 400, and the second groove 410 and the inner core 400 are of equal length in the axial direction. The inner sleeve 200 and the inner core 400 can be snapped and assembled by the second protrusion 220 and the second groove 410, which reduces the manufacturing cost of the inner sleeve 200. At the same time, the cooperation of the second protrusion 220 and the second groove 410 makes the positional relationship between the inner sleeve 200 and the inner core 400 stable.

[0031] It should be understood that during converter operation, gas and powder pass through the first annular gap 300 and the second annular gap 500. At this time, a first boss 110 and a second boss 220 are respectively provided between the first annular gap 300 and the second annular gap 500. The first boss 110 and the second boss 220 block part of the gas and powder from passing through, thereby reducing the efficiency of gas and powder passing through the first annular gap 300 and the second annular gap 500.

[0032] To address this issue, in some embodiments, both the first boss 110 and the second boss 220 are provided with through-holes 600. When the converter is in operation, the gas and powder can pass through the through-holes 600 via the first annular gap 300 and the second annular gap 500, thus preventing a reduction in the converter's operating efficiency. At the same time, this reduces the manufacturing cost of the outer sleeve 100 and the inner sleeve 200.

[0033] In some embodiments, the dimension of the first groove 210 along the circumferential direction of the inner core 400 is equal to that of the first boss 110, which is d2= ~ Where l2 is the outer wall circumference of the inner sleeve 200, and h3 is the radial dimension of the first groove 210 along the inner core 400. ~ The first boss 110 has a radial dimension of h4 = h3 + k2 along the inner core 400, where k2 is the radial dimension of the first annular seam 300 along the inner core 400. The second groove 410 has a circumferential dimension along the inner core 400 equal to that of the second boss 220, which is d1 = ~ Where l1 is the circumference of the inner core 400, and the radial dimension h1 of the second groove 410 along the inner core 400 is... ~ The radial dimension h2 of the second boss 220 along the inner core 400 is h2 = h1 + k1, where k1 is the radial dimension of the second annular seam 500 along the inner core 400. In some embodiments, when the converter is 300t, the circumference l1 of the inner core 400 is 251.2mm, the outer wall circumference l2 of the inner sleeve 200 is [missing value], the radial dimension k2 of the first annular seam 300 along the inner core 400 is 2mm, and the radial dimension k1 of the second annular seam 500 along the inner core 400 is 3mm. The second groove 410 has a circumferential dimension d1 of 15mm along the inner core 400, a radial dimension h1 of 5mm along the inner core 400, a radial dimension h2 of 8mm along the inner core 400, a circumferential dimension d2 of 24mm along the inner core 400, a radial dimension h3 of 8mm along the inner core 400, and a radial dimension h4 of 10mm along the inner core 400 for the first groove 210. The dimensions of all first grooves 210 along the radial and circumferential directions of the inner core 400, the dimensions of the first boss 110 along the radial and circumferential directions of the inner core 400, the dimensions of all second grooves 410 along the radial and circumferential directions of the inner core 400, and the dimensions of the second boss 220 along the radial and circumferential directions of the inner core 400 all satisfy the formula. This ensures that the number of first bosses 110 on the outer sleeve 100, first grooves 210 and second bosses 220 on the inner sleeve 200, and second grooves 410 on the inner core 400 are appropriate. This avoids an excessive number of first grooves 210, first bosses 110, second grooves 410, and second bosses 220, which would lead to structural instability of the outer sleeve 100, inner sleeve 200, and inner core 400, resulting in damage from external forces. It also avoids an insufficient number of first grooves 210, first bosses 110, second grooves 410, and second bosses 220, which would lead to unstable assembly of the outer sleeve 100, inner sleeve 200, and inner core 400.

[0034] In some embodiments, please refer to Figure 1 The converter bottom blowing element also includes a conveying section 700, which is connected to the bottom of the outer sleeve 100, inner sleeve 200, and inner core 400. The conveying section 700 is provided with a conveying chamber 710, which is connected to the second annular gap 500, so that the gas and powder in the conveying section 700 can enter the second annular gap 500 through the conveying chamber 710. One end of the inner core 400 is provided with a guide section 420. When the conveying section 700 is connected to the outer sleeve 100, inner sleeve 200, and bottom of the inner core 400 by casting, the guide section 420 extends from the inner core 400 into the conveying chamber 710, diverting the space in the conveying chamber 710. When some powder enters the conveying chamber 710, it floats in most of the space of the conveying chamber 710 and cannot enter the second annular gap 500, affecting the working efficiency of the converter.

[0035] It should be understood that when the converter is working, some powder collides with the top of the guide section 420 or the conveying section 700 which is far away from the second annular gap 500, causing the powder to be unable to enter the second annular gap 500. At this time, the powder that cannot enter the second annular gap 500 is floating in the conveying chamber 710 or falls to the inlet of the conveying section 700. After a long time, the powder accumulates, causing subsequent powder to be unable to enter the conveying chamber 710, thus affecting the powder conveying efficiency.

[0036] To address the above issues, in some embodiments, please refer to Figures 1-2 The radial dimension of the conveying cavity 710 decreases sequentially in the direction away from the inner core 400, causing the inner wall of the conveying cavity 710 to tilt. Some powder falls onto the inner wall of the conveying cavity 710, reducing the amount of powder falling into the conveying section 700 or floating in the conveying cavity 710. When a certain amount of powder accumulates on the inner wall, some of the powder accumulated on the inner wall slides off, while some remains accumulated on the inner wall, so that the powder entering later will not be obstructed and the efficiency of powder conveying will not decrease.

[0037] In some embodiments, please refer to Figures 1-2 The conveying cavity 710 is a cone shape coaxial with the inner core 400, wherein the cone angle is... Angle of stillness of bottom-blown powder spray Satisfying the relation When the converter is in operation, the powder spraying method is changed, and the cone angle is adjusted. Angle of stillness of bottom-blown powder spray As long as the relation is satisfied The powder can accumulate on the inner wall of the conveying chamber 710, and some of it will slide off as the powder accumulates.

[0038] In some embodiments, please refer to Figures 1-2 The outer sleeve 100 is equipped with a cooling gas delivery pipe. Specifically, the cooling gas delivery pipe passes through the outer wall of the outer sleeve 100. Gas can be delivered through the cooling gas delivery pipe to the first annular gap 300 to cool the outer sleeve 100 and the inner sleeve 200, so as to prevent the outer sleeve 100 and the inner sleeve 200 from being damaged due to high temperature.

[0039] In some embodiments, please refer to Figures 1-2 The number of cooling gas delivery pipes can be multiple. Multiple cooling gas delivery pipes are arranged circumferentially along the outer wall of the outer sleeve 100, which increases the amount of cooling gas entering the first annular gap 300, resulting in a better cooling effect. Furthermore, the parts of the outer sleeve 100 and the inner sleeve 200 that are subjected to the cooling gas are uniform, avoiding uneven heating in some parts.

[0040] Based on the same inventive concept, this application also provides a method for preparing a converter bottom blowing element, comprising the following steps: Step S1: Isostatically press fused magnesium oxide with a particle size of 0~0.5mm to obtain the inner core 400; Step S2: Mix silicon carbide powder with water to form a slurry, and then pour the slurry into the outer sleeve 100 mold and the inner sleeve 200 mold respectively. After demolding, the inner sleeve 200 and the outer sleeve 100 are obtained. Step S3: Assemble the outer sleeve 100, inner sleeve 200 and inner core 400 to obtain the converter bottom blowing element; Detailed explanation of step S1: The fused magnesium oxide raw material was ground and then cast using isostatic pressing. The forming pressure was 200 MPa. After forming, the temperature was slowly raised to 1750℃~1850℃ and held for 4 hours. The total firing time was 30 hours. The resulting core 400 had a bulk density of 3.1 g / cm3 and a room temperature compressive strength of 260 MPa. Detailed explanation of step S2: Silicon carbide powder was mixed with water and poured into molds for outer sleeve 100 and inner sleeve 200 respectively for injection molding. After demolding, the blanks were placed in a vacuum drying oven and dried at 110℃ for 8 hours. Then, the temperature was slowly raised to 1750℃ and held for 2 hours to obtain inner sleeve 200 and outer sleeve 100. The bulk density of outer sleeve 100 and inner sleeve 200 is 3.0 g / cm3, and the room temperature bending strength is 380 MPa. Detailed explanation of step S3: The inner sleeve 200 and the outer sleeve 100 are assembled by using the first boss 110 and the first groove 210 to cooperate; The inner sleeve 200 and the inner core 400 are assembled by using the second boss 220 and the second groove 410 to engage.

[0041] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

Claims

1. A converter bottom blowing element, characterized in that include: The outer tube (100) has a first protrusion (110) on its inner wall. An inner sleeve (200) is coaxially disposed inside the outer sleeve (100). The outer wall of the inner sleeve (200) is provided with a first groove (210) that matches the first boss (110). The inner wall of the inner sleeve (200) is provided with a second boss (220). There is a first annular gap (300) between the outer sleeve (100) and the inner sleeve (200) for cooling gas to flow. The inner core (400) is coaxially disposed inside the inner sleeve (200). The outer wall of the inner core (400) is provided with a second groove (410) that matches the second boss (220). There is a second annular slit (500) between the inner sleeve (200) and the inner core (400) for the flow of dephosphorization powder and carrier gas. The conveying part (700) is connected to the outer sleeve (100) and the inner sleeve (200). The conveying part (700) is provided with a conveying cavity (710) communicating with the second annular seam (500). One end of the inner core (400) extends out of the inner sleeve (200). The portion of the inner core (400) extending out of the inner sleeve (200) forms a guide part (420). The guide part (420) is located in the conveying cavity (710).

2. The converter bottom blowing element according to claim 1, characterized in that, The first protrusion (110) and the first groove (210) are provided in multiple ways, and the multiple first protrusions (110) and the multiple first grooves (210) correspond one-to-one, and the multiple first protrusions (110) are spaced apart; The second protrusion (220) and the second groove (410) are provided in multiple ways, and the multiple second protrusions (220) and the multiple second grooves (410) correspond one-to-one, and the multiple second protrusions (220) are spaced apart.

3. The converter bottom blowing element according to claim 1, characterized in that, Both the first boss (110) and the second boss (220) are provided with through vent holes (600).

4. The converter bottom blowing element according to claim 1, characterized in that, The dimension of the first groove (210) along the circumferential direction of the inner core (400) is equal to that of the first boss (110), which is d2= ~ Wherein, l2 is the outer circumference of the inner sleeve (200); The first groove (210) has a radial dimension h3 along the inner core (400) = ~ ; The first boss (110) has a radial dimension along the inner core (400) of h4 = h3 + k2, where k2 is the radial dimension of the first annular seam (300) along the inner core (400); The second groove (410) has a dimension equal to that of the second boss (220) along the circumferential direction of the inner core (400), which is d1= ~ , where l1 is the circumference of the inner core (400); The second groove (410) has a radial dimension h1 along the inner core (400) = ~ ; The second boss (220) has a radial dimension h2 = h1 + k1 along the inner core (400), where k1 is the radial dimension of the second annular seam (500) along the inner core (400).

5. The converter bottom blowing element according to claim 1, characterized in that, The radial dimension of the delivery cavity (710) decreases sequentially in the direction away from the inner core (400).

6. The converter bottom blowing element according to claim 5, characterized in that, The conveying cavity (710) is conical and coaxial with the inner core (400), wherein the cone angle of the conical conveying cavity (710) is... and the stationary angle of the dephosphorized powder Satisfying the relation .

7. The converter bottom blowing element according to any one of claims 1-4, characterized in that, The converter bottom blowing element also includes a cooling gas delivery pipe connected to the outer sleeve (100), and the first annular slit (300) is closed on the side of the furnace cavity away from the converter.

8. A converter, characterized in that, It includes a furnace body and a converter bottom blowing element as described in any one of claims 1-7, wherein the converter bottom blowing element is connected to the furnace body.

9. A method for preparing a converter bottom-blowing element, used to prepare the converter bottom-blowing element according to any one of claims 1-7, characterized in that, The preparation method includes: The inner core (400) is obtained by isostatic pressing of fused magnesium oxide with a particle size of 0~0.5mm. Silicon carbide powder is mixed with water to form a slurry. The slurry is then introduced into the outer sleeve (100) mold and the inner sleeve (200) mold, respectively. After demolding, the inner sleeve (200) and the outer sleeve (100) are obtained. The outer sleeve (100), the inner sleeve (200), and the inner core (400) are assembled to obtain the converter bottom blowing element.

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