Blanking opening of converter

Abstract

The inner wall of an inclined blanking pipe is thickened within a certain axial range from the lower end of the inclined blanking pipe, a thickened layer with the radial height consistent with that of a wear-resistant bulge above is obtained, and molten steel splashed and entering the blanking pipe is received through the thickened layer, so that the molten steel can quickly flow back, slag adhering is avoided, and the service life of the converter blanking port is prolonged. The conditions that the blanking angle deviates and the blanking pipe is blocked due to slag adhering are avoided, and the reliability of the blanking opening is improved on the premise that the abrasion speed is delayed and the service life of the blanking pipe is prolonged; the bearing plate and the cover plate are arranged on the upward side of the lower connecting flange, the closed containing cavity is formed among the lower connecting flange, the bearing plate, the cover plate and the outer wall of the discharging pipe and filled with the high-temperature-resistant refractory mortar, under the blocking effect of the refractory mortar, even if the lower connecting flange is burnt out, smoke cannot leak to the external space, and therefore the smoke leakage phenomenon is avoided. And the converter blanking port can be continuously used until the blanking pipe is excessively worn, so that the service life of the converter blanking port can be effectively prolonged.

Description

Technical Field

[0001] This utility model belongs to the technical field of converter steelmaking in metallurgy, specifically relating to a converter feeding port. Background Technology

[0002] Converter steelmaking uses molten iron, scrap steel, and ferroalloys as main raw materials. Without external energy sources, it relies on the physical heat of the molten iron itself and the heat generated by the chemical reaction between oxygen blowing and the iron components to complete the steelmaking process in the converter. During converter steelmaking, a large amount of high-temperature flue gas is generated. To recover the waste heat from the high-temperature flue gas and reduce environmental pollution, a flue-type waste heat boiler is usually installed at the end of the converter's flue. Simultaneously, to add steelmaking raw materials such as scrap steel and ferroalloys to the converter, material discharge ports are usually installed on both sides of the converter's flue, as shown in the appendix to the specification of Chinese Patent CN220468026U, "A Converter Material Discharge Port". Figure 1 As shown, the discharge port mainly includes a discharge pipe 1 that is inclined and connected to the outer wall of the flue through a lower flange 111 at its lower end. In order to reduce the impact of the discharge pipe installation on the flue, the lower end of the discharge pipe is made into a single V-shaped bevel with the bevel tip facing down. The upper end of the discharge pipe is connected to the discharge device through an upper flange 13.

[0003] In the converter steelmaking process, the charging pipe, being close to the converter opening, is directly exposed to the high-temperature flames and flue gas. Therefore, to reduce the burning rate and extend the service life of the charging pipe, cooling water pipes are typically installed within the pipe wall to circulate cooling water and lower its temperature. In addition to the high-temperature exposure, the inner wall of the charging pipe also withstands the impact and friction of the steelmaking raw materials. Due to the large daily volume of material fed into the pipe and its rapid wear rate, the cooling water pipes are prone to rupture, and even leakage may occur due to wear and tear on the inner wall. This is especially true on the inner wall near the bevel tip, where the steelmaking raw materials tend to agglomerate due to gravity during charging, leading to faster wear. Once the inner wall is severely worn or cooling water leaks, the furnace must be shut down for repair welding or replacement of the charging pipe. Therefore, to reduce the wear rate of the charging pipe, extend its service life, and improve production efficiency, wear-resistant teeth are typically installed on the inner wall of the charging pipe. (See the appendix to the specification of the aforementioned Chinese patent CN220468026U.) Figure 1Reference numerals 2 and 3, and a water-cooled pre-embedded pipe type feeding port device disclosed in Chinese patent CN111763799A, and a wear-resistant water-cooled jacket in a converter waste heat boiler feeding port device disclosed in Chinese patent CN218937041U; however, because the lower end of the feeding pipe extends into the flue and is close to the converter opening, the molten steel in the converter is easily splashed upwards due to boiling and impact from the feeding, falling onto the inner wall of the lower end of the feeding pipe. The presence of wear-resistant teeth will affect the molten steel backflow, causing some molten steel to condense on the inner wall to form slag. Excessive slag formation can easily cause blockage of the feeding pipe, resulting in abnormal feeding. Furthermore, the collision between the steelmaking raw materials and the slag can cause deviations in the feeding angle of the steelmaking raw materials, which may result in the steelmaking raw materials not falling accurately into the converter. In addition, as shown in the appendix to the specification of the aforementioned Chinese patent CN220468026U. Figure 1 As shown, for ease of installation, the opening in the flue for the feed pipe to extend into is generally slightly larger than the bevel of the feed pipe 1. This creates a certain gap between the feed pipe and the opening. During the converter steelmaking process, due to this gap, the lower flange 111, which connects the feed pipe to the outer wall of the flue, is also directly exposed to the high-temperature flame and flue gas. This can easily cause the area on the lower flange near the tip of the feed pipe bevel to burn through before the feed pipe itself, especially at the weld between the lower flange and the outer wall of the feed pipe. This not only affects the service life of the feed port, but also allows flue gas to leak through the burned-through lower flange, potentially causing injury to operators and posing a safety hazard. In summary, to address the existing problems of slag buildup and blockage on the inner wall of the lower end of the feed pipe, and the lower flange's tendency to fail before the feed pipe, further improvements to the feed port are needed to enhance its service life and reliability. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of this utility model is to provide a converter feeding port, which solves the technical problems of easy slag accumulation and blockage of the feeding pipe of the existing feeding port, and achieves the effect of improving the service life and reliability of the feeding port.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A converter feed port includes a feed pipe with an axially connected wear-resistant section and an anti-slag-sticking section on its inner wall. The wear-resistant section is formed by a number of wear-resistant protrusions spaced apart on the inner wall of the feed pipe, and the anti-slag-sticking section is formed by a thickened layer obtained by thickening the inner wall of the feed pipe. The anti-slag-sticking section extends axially to the end of the feed pipe away from the wear-resistant section.

[0007] Optionally, a lower connecting flange is fixedly fitted on the end of the discharge pipe away from the wear-resistant section. A sleeve is connected to the side of the lower connecting flange facing the other end of the discharge pipe. The sleeve is fitted outside the discharge pipe and forms a receiving cavity with the discharge pipe. The receiving cavity is filled with refractory filler.

[0008] Optionally, the wear-resistant section and the anti-slag section have a certain circumferential dimension on the inner wall of the discharge pipe and are located in the same circumferential position.

[0009] A lower connecting flange is fixedly fitted on the end of the discharge pipe away from the wear-resistant section. A bearing plate is connected to the side of the lower connecting flange facing the other end of the discharge pipe. The bearing plate surrounds part of the outer wall of the discharge pipe and forms a receiving cavity with the part of the outer wall. The receiving cavity is located on the same side of the discharge pipe as the wear-resistant section and the anti-slag section. Refractory filler is provided in the receiving cavity.

[0010] Furthermore, the support plate bends inward at both ends of the circumferential direction of the discharge pipe and connects to the discharge pipe. A cover plate is connected to the side of the support plate away from the lower connecting flange to close the accommodating cavity.

[0011] The lower connecting flange is vertically positioned and the discharge pipe passes through it at an angle. The bearing plate is located on the lower connecting flange below the discharge pipe. The circumferential dimension of the accommodating cavity is less than or equal to half the outer diameter of the discharge pipe. The side of the lower connecting flange connected to the bearing plate is provided with a first reinforcing rib that connects to the outer wall of the discharge pipe. The side of the bearing plate away from the discharge pipe is provided with a second reinforcing rib that extends axially to connect with the lower connecting flange. The side of the cover plate away from the bearing plate is provided with a third reinforcing rib that extends vertically. The upper end of the third reinforcing rib connects to the outer wall of the discharge pipe, and the lower end extends to connect with the axially extending second reinforcing rib.

[0012] Furthermore, the end of the feed pipe furthest from the wear-resistant section has a single V-shaped bevel, and the circumferential midpoints of the wear-resistant section and the anti-slag section correspond to the circumferential position of the bevel tip; the anti-slag section is within the axial range of the bevel and its circumferential dimension varies with the bevel; the circumferential dimension of the wear-resistant section within the axial range of the bevel varies with the bevel; the circumferential dimension of the wear-resistant section outside the axial range of the bevel is at least half the inner circle of the feed pipe; the circumferential midpoint of the receiving cavity corresponds to the circumferential position of the bevel tip.

[0013] Furthermore, the thickness of the thickened layer is equal to the radial dimension of the wear-resistant protrusion.

[0014] Furthermore, the plurality of wear-resistant protrusions are axially spaced and extend circumferentially, and the cross-section of the wear-resistant protrusions is rectangular; or the plurality of wear-resistant protrusions are circumferentially spaced and extend axially, and the cross-section of the wear-resistant protrusions is rectangular, trapezoidal or circular.

[0015] Furthermore, the blanking tube is cast from alloy steel, and the wear-resistant protrusions are integrally cast with the blanking tube or fixed to the inner wall of the blanking tube by welding.

[0016] Furthermore, a U-shaped water-cooling pipe is embedded inside the wall of the discharge pipe. There are multiple water-cooling pipes evenly distributed around the circumference. The U-shaped bend of the water-cooling pipe is located at the end of the discharge pipe away from the wear-resistant section. The two free ends of the water-cooling pipe extend axially to the other end of the discharge pipe and protrude outward. A distribution pipe and a collection pipe are provided outside the discharge pipe. The distribution pipe is connected to one end of each water-cooling pipe to allow cooling water to flow in uniformly. The collection pipe is connected to the other end of each water-cooling pipe to allow cooling water to flow out uniformly.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The converter feeding port of this utility model is designed with a wear-resistant section formed by several spaced wear-resistant protrusions on the inner wall of the feeding pipe, maintaining a certain distance from the lower end of the inclined feeding pipe. Within this distance range, the inner wall of the feeding pipe is thickened to obtain a smooth thickened layer, which also serves as an anti-slag-sticking section. During feeding, the inner wall of the feeding pipe is replaced by the wear-resistant section and the anti-slag-sticking section to allow the steelmaking raw materials to slide down, thereby slowing down the wear rate of the inner wall of the feeding pipe. The inner wall of the feeding pipe also uses the anti-slag-sticking section to catch the molten steel that splashes upward and enters the feeding pipe, allowing the molten steel to flow back quickly without forming slag. Even if slag forms, it is easy to clean from the top, avoiding deviations in the feeding angle and blockage of the feeding pipe caused by slag. Thus, while ensuring the slowing down of the wear rate and extending the service life of the feeding pipe, the reliability of the converter feeding port is effectively improved.

[0019] 2. The converter discharge port of this utility model has a bearing plate and a cover plate on the side of the lower connecting flange facing the upper end of the discharge pipe, so that a closed receiving cavity is formed between the lower connecting flange, the bearing plate, the cover plate and the outer wall of the discharge pipe. The receiving cavity is filled with high-temperature resistant refractory mortar. Under the barrier effect of the refractory mortar, even if the lower connecting flange is burned, the flue gas will not leak into the external space. The converter discharge port can continue to be used until the discharge pipe is worn excessively, which can effectively extend the service life of the converter discharge port.

[0020] 3. The converter feeding port of this utility model adopts an alloy steel integrally cast water-cooled pipe inside the wall of the feeding pipe. There are multiple U-shaped water-cooled pipes evenly distributed around the circumference. The U-shaped bend of the water-cooled pipe is close to the lower end of the inclined feeding pipe. In use, by circulating cooling water into the water-cooled pipe, the feeding pipe is cooled, which can effectively prevent the feeding pipe from deforming or being damaged due to excessive temperature. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the axially split structure of the converter feed port described in Example 1;

[0022] Figure 2 This is a schematic diagram of the converter's discharge port facing the feed end as described in Embodiment 1 (the upper connecting flange 5 is omitted).

[0023] Figure 3 For along Figure 1 A cross-sectional schematic diagram of AA (with wear-resistant protrusion 2 and water-cooling pipe 9 hidden);

[0024] Figure 4 This is a schematic diagram of the axially split structure of the converter feed port described in Example 2;

[0025] Figure 5 This is a schematic diagram of the converter discharge port facing the feed end as described in Embodiment 2 (the upper connecting flange 5 is omitted).

[0026] Figure 6 for Figure 5 The diagram shows a trapezoidal cross-section of the wear-resistant protrusions in the indicated state.

[0027] Figure 7 for Figure 5 The diagram shows a circular cross-section of the wear-resistant protrusion in the indicated state.

[0028] Figure 8 This is a cross-sectional schematic diagram of the U-shaped support plate used in Embodiment 3;

[0029] Among them, the material discharge pipe 1, wear-resistant protrusion 2, thickened layer 3, lower connecting flange 4, upper connecting flange 5, bearing plate 6, refractory filler 7, cover plate 8, water cooling pipe 9, distribution pipe 10, collection pipe 11, first reinforcing rib 12, second reinforcing rib 13, and third reinforcing rib 14. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0031] Example 1:

[0032] Please see Figure 1 and Figure 2A converter feed port includes a feed pipe 1. The inner wall of the feed pipe 1 has axially distributed and connected wear-resistant sections and anti-slag-sticking sections. The wear-resistant sections are formed by a plurality of wear-resistant protrusions 2 spaced apart on the inner wall of the feed pipe 1. The anti-slag-sticking sections are formed by a thickened layer 3 obtained by thickening the inner wall of the feed pipe 1. The anti-slag-sticking sections extend axially from the position connected to the wear-resistant sections to the end of the feed pipe 1 away from the wear-resistant sections. In practice, the wear-resistant sections and anti-slag-sticking sections can be circumferentially distributed throughout the inner wall of the feed pipe 1. However, considering the situation where steelmaking raw materials are concentrated due to gravity in the inclined feed pipe 1, as well as the weight and cost of the converter feed port, in this embodiment, the wear-resistant sections and anti-slag-sticking sections are not distributed throughout the inner wall of the feed pipe 1. The wear-resistant sections and anti-slag-sticking sections have a certain circumferential dimension on the inner wall of the feed pipe 1 and are located in the same circumferential position. A lower connecting flange 4 is welded and fixed to the outer side of the end of the feed pipe 1 away from the wear-resistant sections, and an upper connecting flange 5 is welded and fixed to the outer side of the other end for installation connection.

[0033] The converter feed inlet of this utility model is installed by tilting the feed pipe 1 and using the end of the feed pipe 1 furthest from the wear-resistant section as the lower end. The lower end of the feed pipe 1 is connected to the flue (not shown in the figure) through the lower connecting flange 4. The wear-resistant section and the anti-slag section should be the bottom of the inner wall of the tilted feed pipe 1 so that the steelmaking raw materials that agglomerate due to gravity during feeding mainly enter the furnace mouth through the wear-resistant section and the anti-slag section. The upper end of the feed pipe 1 is connected to the feeding device (not shown in the figure) through the upper connecting flange 5. In use, the feeding device feeds the steelmaking raw materials into the feed pipe 1 from the upper end of the feed pipe 1. As the steelmaking raw materials slide down inside the feed pipe 1, they agglomerate on the wear-resistant section and the anti-slag section of the inner wall of the feed pipe 1 due to gravity. The wear-resistant section and the anti-slag section replace the inner wall of the feed pipe 1 for the steelmaking raw materials to slide down. This effectively slows down the wear rate of the inner wall of the feed pipe 1, thereby extending the service life of the feed pipe 1. In addition, when the molten steel in the converter splashes upward due to boiling and impact from the feed pipe and falls into the lower end of the feed pipe 1, it falls onto the relatively smooth thickened layer 3 formed by the thickening of the inner wall of the feed pipe 1. The molten steel can flow back quickly and is not prone to forming slag. Even if slag forms, it is easy to clean from the top. This can effectively avoid the impact, deviation of the feed angle, and blockage of the feed pipe 1 caused by the presence of slag during the feed. In practice, the length of the thickened layer 3 extending upward in the axial direction is determined according to the length of the feed pipe 1 installed into the flue. Specifically, it is based on the highest axial position of the molten steel splashing onto the inner wall of the feed pipe 1. In this embodiment, the thickened layer 3 extends upward in the axial direction to above the lower connecting flange 4.

[0034] The converter feeding port of this utility model is designed with a wear-resistant section formed by several spaced wear-resistant protrusions 2 on the inner wall of the feeding pipe 1, which maintains a certain distance from the lower end of the feeding pipe 1 in use. Within this distance range, the inner wall of the feeding pipe 1 is thickened to obtain a smooth thickened layer 3, which also serves as an anti-slag-sticking section. During feeding, the inner wall of the feeding pipe 1 is replaced by the wear-resistant section and the anti-slag-sticking section to allow the steelmaking raw materials to slide down, thereby slowing down the wear rate of the inner wall of the feeding pipe 1. The inner wall of the feeding pipe 1 also uses the anti-slag-sticking section to catch the molten steel that splashes upward and enters the feeding pipe 1, so that the molten steel can flow back quickly and does not form slag. This avoids deviations in the feeding angle and blockage of the feeding pipe 1 caused by slag. Thus, the reliability of the converter feeding port is effectively improved while ensuring that the wear rate is slowed down and the service life of the feeding pipe 1 is extended.

[0035] Please see Figure 1 and Figure 2 As mentioned in the background, to reduce the impact of the installation of the feed pipe 1 on the flue, this embodiment also designs the end of the feed pipe 1 away from the wear-resistant section to have a single V-shaped bevel. In order to allow the wear-resistant section and the anti-slag section to smoothly receive and allow the steelmaking raw materials that are agglomerated to slide down, the circumferential middle of the wear-resistant section and the anti-slag section are set to correspond to the circumferential position of the bevel tip. That is, in the circumferential direction, the wear-resistant section and the anti-slag section extend symmetrically to both sides from the position on the inner wall of the feed pipe 1 corresponding to the bevel tip. In this embodiment, in order to ensure the effectiveness of the wear-resistant section in protecting the inner wall of the feed pipe 1, the circumferential dimension of the wear-resistant section outside the axial range of the bevel is designed to be at least half of the inner diameter of the feed pipe 1, preferably two-thirds. The circumferential dimension of the wear-resistant section within the axial range of the bevel varies with the bevel, and the circumferential dimension of the anti-slag section within the axial range of the bevel also varies with the bevel.

[0036] Please see Figure 1 and Figure 2 The thickness of the thickened layer 3 is equal to the radial dimension of the wear-resistant protrusion 2, and the wear-resistant section and the anti-slag-sticking section are axially connected. Therefore, if the thickness of the thickened layer 3 is greater than the radial dimension of the wear-resistant protrusion 2, an upward-facing step surface will form between the wear-resistant section and the anti-slag-sticking section. When some steelmaking raw materials slide from the wear-resistant section to the anti-slag-sticking section, they will collide with the step surface, which will not only impact the converter feed port but also easily cause deviations in the feed angle. If the thickness of the thickened layer 3 is less than the radial dimension of the wear-resistant protrusion 2, a downward-facing step surface will form between the wear-resistant section and the anti-slag-sticking section. On the stepped surface, some steelmaking raw materials may suddenly drop when sliding from the wear-resistant section to the anti-slag-sticking section, which not only impacts the converter feed port but also accelerates the wear of the anti-slag-sticking section. In this invention, the thickness of the thickened layer 3 is equal to the radial dimension of the wear-resistant protrusion 2, and the wear-resistant section and the anti-slag-sticking section are axially connected, so that the wear-resistant section and the anti-slag-sticking section are axially connected more smoothly. This makes the steelmaking raw materials slide more smoothly through the wear-resistant section and the anti-slag-sticking section, which is beneficial to improving the stability and practicality of the converter feed port.

[0037] Please see Figure 1 In this embodiment, the wear-resistant protrusions 2 are axially spaced and circumferentially extended, and the cross-section of the wear-resistant protrusions 2 is rectangular. These circumferentially extended and axially spaced wear-resistant protrusions 2 are mainly suitable for steelmaking raw materials with small particle size. Some of the steelmaking raw materials will fill the gaps between the wear-resistant protrusions 2 during the sliding process, thereby further reducing the wear on the inner wall of the feed pipe 1 and extending the service life of the converter feed port. In practice, the wear-resistant protrusions 2 can be integrally cast with the feed pipe 1 or fixed to the inner wall of the feed pipe 1 by welding.

[0038] Please see Figure 1 and Figure 3 The discharge pipe 1 has a lower connecting flange 4 fixedly fitted at one end away from the wear-resistant section and an upper connecting flange 5 fixedly fitted at the other end. In practice, an integral annular sleeve (not shown in the figure) can be connected to the side of the lower connecting flange 4 facing the upper connecting flange 5, so that the sleeve fits around the discharge pipe 1 and forms a receiving cavity with the discharge pipe 1. The receiving cavity is filled with refractory filler. Similarly, considering that the portion of the lower connecting flange 4 above the center of the discharge pipe 1 is less likely to be burned through due to its vertical height, in order to reduce the weight and cost of the converter discharge port, in this embodiment, a bearing plate 6 is connected to the side of the lower connecting flange 4 facing the upper connecting flange 5. The bearing plate 6 surrounds part of the outer wall of the discharge pipe 1 and forms a receiving cavity with said part of the outer wall. The receiving cavity is located on the same side of the discharge pipe as the wear-resistant section and the anti-slag section, and refractory filler 7 is provided in the receiving cavity. During installation, the discharge pipe 1 is shaped as follows: Figure 1 In the inclined configuration shown, the receiving cavity, wear-resistant section, and anti-slag-sticking section are all located in the lower semicircle of the discharge pipe 1, with the wear-resistant section and anti-slag-sticking section on the inner side and the receiving cavity on the outer side. Specifically, the refractory filler is made of refractory mortar, and the supporting plate 6 is arc-shaped and made of rolled steel plate. The supporting plate 6 vertically surrounds the lower half of the discharge pipe 1 to reduce the weight and cost of the converter discharge port by reducing its own weight and the amount of refractory mortar used. In addition, to strengthen the connection between the lower connecting flange 4 and the discharge pipe 1, the side of the lower connecting flange 4 facing the upper end of the discharge pipe is provided with a first reinforcing rib 12 that connects to the outer wall of the discharge pipe 1. To strengthen the connection between the supporting plate 6 and the lower connecting flange 4, the side of the supporting plate 6 away from the discharge pipe 1 is provided with a second reinforcing rib 13 that extends axially to connect with the lower connecting flange 4. In the circumferential direction, the wear-resistant section and the anti-slag-sticking section are preferably set at 240°, and the supporting plate 6 and the receiving cavity are preferably set at 180°.

[0039] Thus, during the converter steelmaking process, even if the lower connecting flange 4 is directly exposed to high-temperature flames and flue gas, causing the position of the lower connecting flange 4 near the bevel tip of the feed pipe 1 to be burned through before the feed pipe 1, the flue gas will still be blocked by the refractory filler 7 and cannot escape, thereby preventing the service life of the converter feed port from being greatly reduced due to damage to the lower connecting flange 4. After the lower connecting flange 4 is burned through, the refractory filler 7 will be directly exposed to the flue gas and will also be difficult to block the flue gas from escaping for a long time. Therefore, the amount of refractory filler 7 in the accommodating cavity should be reasonably set during implementation, mainly in terms of the axial dimension of the refractory filler 7 in the accommodating cavity, to ensure that the refractory filler 7 can maintain its blocking effect on the flue gas until the feed pipe 1 is excessively worn.

[0040] Please see Figure 1 and Figure 3 The bearing plate 6 bends inward at both ends of the circumferential upward section of the discharge pipe 1 and connects to the discharge pipe 1. A cover plate 8 is connected to the side of the bearing plate 6 away from the connecting flange. In this way, the bearing plate 6 is connected not only to the lower connecting flange 4, but also to the discharge pipe 1, which helps to improve the structural stability of the accommodating cavity. The cover plate 8 is used to seal the accommodating cavity. In practice, after the refractory filler 7 is compressed and filled into the accommodating cavity, the cover plate 8 is welded and fixed between the bearing plate 6 and the outer wall of the discharge pipe 1. This can prevent the refractory filler 7 from becoming loose due to axial expansion caused by heat, and can also prevent flue gas from leaking out through the accommodating cavity. In addition, in order to strengthen the connection strength between the cover plate 8, the discharge pipe 1, and the bearing plate 6, the side of the cover plate 8 facing the upper end of the discharge pipe is provided with a vertically extending third reinforcing rib 14. The upper end of the third reinforcing rib 14 is connected to the outer wall of the discharge pipe 1, and the lower end extends to connect with the axially extending second reinforcing rib 13.

[0041] Please see Figure 1 and Figure 2 The inner wall of the discharge pipe 1 is embedded with a U-shaped water-cooling pipe 9. There are multiple water-cooling pipes 9 evenly distributed around the circumference. The U-shaped bend of the water-cooling pipe 9 is located at the end of the discharge pipe 1 away from the wear-resistant section. The two free ends of the water-cooling pipe 9 extend axially to the other end of the discharge pipe 1 and protrude outward. In this embodiment, the discharge pipe 1 and the water-cooling pipe 9 are integrally cast from alloy steel. In this way, during use, the discharge pipe 1 can be cooled by circulating cooling water to the water-cooling pipe 9, thereby preventing the discharge pipe 1 from deforming or being damaged due to excessive temperature.

[0042] Please see Figure 1 and Figure 2In addition, a distribution pipe 10 and a collection pipe 11 are provided outside the material discharge pipe 1. The distribution pipe 10 is connected to one end of each water cooling pipe 9, and the collection pipe 11 is connected to the other end of each water cooling pipe 9. In this way, it is convenient to uniformly introduce cooling water into each water cooling pipe 9 through the distribution pipe 10 and uniformly discharge the cooling water in the water cooling pipe 9 through the collection pipe 11. In this embodiment, both the distribution pipe 10 and the collection pipe 11 are designed as rings and are arranged around the outside of the material discharge pipe 1, making the structure of the converter material discharge port more compact and the arrangement more convenient.

[0043] Example 2:

[0044] Please see Figure 4 The difference from Embodiment 1 is that the plurality of wear-resistant protrusions are circumferentially spaced and extend axially, please refer to the following for details. Figure 5 , Figure 6 and Figure 7 The cross-section of the wear-resistant protrusion 2 can be rectangular, trapezoidal or circular; this type of axially extended and circumferentially spaced wear-resistant protrusion 2 is mainly suitable for steelmaking raw materials with larger particle size. In practice, the wear-resistant protrusion 2 can be integrally cast with the feed pipe 1 or fixed to the inner wall of the feed pipe 1 by welding.

[0045] Example 3:

[0046] Please see Figure 8 The difference from Embodiment 1 is that the bearing plate 6 has a U-shaped structure with the notch facing the material drop pipe 1, and the two ends of the bearing plate 6 forming the notch bend inward and extend to connect with the material drop pipe 1.

[0047] In summary, the converter discharge port of this utility model thickens the inner wall of the discharge pipe 1 within a certain axial range from the lower end of the discharge pipe 1, resulting in a thickened layer 3 with the same radial height as the wear-resistant protrusion 2 above. The thickened layer 3 catches the molten steel splashing upwards and entering the discharge pipe 1, allowing the molten steel to flow back quickly without forming slag. This avoids deviations in the discharge angle and blockage of the discharge pipe 1 caused by slag buildup, thus achieving the goal of slowing down the wear rate and extending the service life of the discharge pipe 1. This effectively improves the reliability of the converter's discharge port. In addition, a bearing plate 6 and a cover plate 8 are installed on the side of the lower connecting flange 4 facing the upper end of the discharge pipe 1, so that a closed accommodating cavity is formed between the lower connecting flange 4, the bearing plate 6, the cover plate 8 and the outer wall of the discharge pipe 1. The accommodating cavity is filled with high-temperature refractory mortar. Under the barrier effect of the refractory mortar, even if the lower connecting flange 4 is burned, the flue gas will not leak into the external space, and the converter discharge port can continue to be used until the discharge pipe 1 is worn excessively, which can effectively extend the service life of the converter discharge port.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of this utility model that do not depart from the spirit and scope of this technical solution should be covered within the scope of the claims of this utility model.

Claims

1. A converter nozzle characterized by: Includes a discharge pipe (1), the inner wall of the discharge pipe (1) has an axially connected wear-resistant section and an anti-slag section, the wear-resistant section is formed by a number of wear-resistant protrusions (2) spaced apart on the inner wall of the discharge pipe (1), the anti-slag section is formed by a thickened layer (3) obtained by thickening the inner wall of the discharge pipe (1), and the anti-slag section extends axially to the end of the discharge pipe (1) away from the wear-resistant section; The wear-resistant protrusions (2) are axially spaced and extend circumferentially; or the wear-resistant protrusions (2) are circumferentially spaced and extend axially, and the cross-section of the wear-resistant protrusions (2) is rectangular, trapezoidal or circular. The wear-resistant section and the anti-slag section have a certain circumferential dimension on the inner wall of the discharge pipe (1) and are located in the same circumferential position; the end of the discharge pipe (1) away from the wear-resistant section is a single V-shaped bevel, and the circumferential middle of the wear-resistant section and the anti-slag section corresponds to the circumferential position of the tip of the bevel.

2. A converter nozzle as claimed in claim 1, wherein: The end of the discharge pipe (1) away from the wear-resistant section is fixedly fitted with a lower connecting flange (4). A sleeve is connected to the side of the lower connecting flange (4) facing the other end of the discharge pipe (1). The sleeve is fitted outside the discharge pipe (1) and forms a receiving cavity with the discharge pipe (1). The receiving cavity is filled with refractory filler (7).

3. The converter spout defined in claim 1, wherein: The end of the discharge pipe (1) away from the wear-resistant section is fixedly fitted with a lower connecting flange (4). The side of the lower connecting flange (4) facing the other end of the discharge pipe (1) is connected to a bearing plate (6). The bearing plate (6) surrounds part of the outer wall of the discharge pipe (1) and forms a cavity between the outer wall and the part of the outer wall. The cavity is located on the same side of the discharge pipe (1) as the wear-resistant section and the anti-slag section. The cavity is filled with refractory filler (7).

4. A converter nozzle as claimed in claim 3, wherein: The bearing plate (6) bends inward at both ends of the circumferential direction of the discharge pipe (1) and connects to the discharge pipe (1). A cover plate (8) is connected to the side of the bearing plate (6) away from the lower connecting flange (4) to close the accommodating cavity.

5. The converter spout defined in claim 1, wherein: The anti-slag section is within the axial range of the bevel and its circumferential dimension varies with the bevel. The circumferential dimension of the wear-resistant section within the axial range of the bevel varies with the bevel. The circumferential dimension of the wear-resistant section outside the axial range of the bevel is at least half of the inner circle of the drop pipe (1).

6. The converter nozzle defined in claim 1 wherein: The thickness of the thickened layer (3) is equal to the radial dimension of the wear-resistant protrusion (2).

7. The converter nozzle defined in claim 1 wherein: The material drop tube (1) is cast from alloy steel, and the wear-resistant protrusion (2) is integrally cast with the material drop tube (1) or fixed to the inner wall of the material drop tube (1) by welding.

8. The converter nozzle defined in claim 1 wherein: The inside of the wall of the discharge pipe (1) is embedded a U-shaped water cooling pipe (9). There are multiple water cooling pipes (9) and they are evenly distributed around the circumference. The U-shaped bend of the water cooling pipe (9) is located at the end of the discharge pipe (1) away from the wear-resistant section. The two free ends of the water cooling pipe (9) extend axially to the other end of the discharge pipe (1) and extend outward. The discharge pipe (11) is provided with a distribution pipe (10) and a collection pipe (11). The distribution pipe (10) is connected to one end of each water cooling pipe (9) to allow cooling water to flow in uniformly. The collection pipe (11) is connected to the other end of each water cooling pipe (9) to allow cooling water to flow out uniformly.

Images