Scouring-resistant submersed nozzle

Abstract

The scouring-resistant submersed nozzle comprises a bowl opening section, a transition section, a slag line section and a flow dividing assembly, the transition section is fixedly connected to the bottom of the bowl opening section, the slag line section is fixedly connected to the bottom of the transition section, the slag line section is in a bell shape, and the inner diameter of the bottom of the slag line section is larger than that of the top of the slag line section. The flow dividing assembly is arranged in the slag line section and composed of a flow dividing cone and a connecting rod. Through the combined action of the bell-shaped design of the slag line section and the shunting assembly in the slag line section, the flowing state of molten steel is obviously optimized, the inner diameter of the bottom of the slag line section is larger than that of the top of the slag line section, the gradually-expanding design is beneficial to slowing down the flowing speed of the molten steel and reducing scouring, meanwhile, the molten steel can be effectively shunted through the arrangement of the shunting cone, and the service life of the molten steel is prolonged. Molten steel flows into the crystallizer more evenly, too strong local scouring is avoided, the quality of a casting blank is improved, scouring erosion to the water gap is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of metallurgical equipment, in particular to an erosion-resistant immersed water outlet. Background Art

[0002] The submerged nozzle is a refractory sleeve for pouring that is installed at the bottom of the intermediate tank in the continuous steel casting equipment and inserted below the steel liquid level of the crystallizer. Its main function is to prevent secondary oxidation of the intermediate tank injection flow and splashing of molten steel, to prevent the mold protection slag from being involved in the molten steel, and to improve the flow state and heat flow distribution of the injection flow in the crystallizer. The submerged nozzle is widely used in industrial production and can be used in the smelting, casting, forging and other processes of metals such as steel, non-ferrous metals, and aluminum alloys to achieve automation and refinement of the metal smelting and casting process. Its shape has a decisive influence on the control ability of flow rate and flow direction. Generally, the design of cross-sectional shapes such as triangles or trapezoids is adopted to improve the flow rate and flow stability of molten steel.

[0003] When some existing immersed nozzles are in use, side holes are opened at the tail of the nozzle. Although the side holes help to disperse the molten steel and slow down the flow rate, they also increase the scouring path and contact points. When the molten steel passes through the side holes, eddies and turbulence may be generated, aggravating the scouring and erosion of the edges of the side holes.

[0004] For example, the announcement number CN212070377U discloses an immersed nozzle with a reinforced slag line. The slag line of this patent adopts high-carbon material that is resistant to corrosion and scour, which enhances the erosion and scour resistance of the immersed long nozzle. A side hole is provided at the tail of the immersed nozzle to slow down the flow rate of the molten steel, increase the service life of the immersed nozzle, and improve production efficiency.

[0005] The design of opening a side hole at the tail of the nozzle does have a positive effect of dispersing the molten steel and slowing down the flow rate of the molten steel, which is crucial for optimizing the continuous casting process and reducing nozzle erosion. However, the presence of the side hole also provides more scouring paths and contact points for the molten steel, which may lead to some problems. First, when the molten steel passes through the side hole, due to its high-speed flow and the special structure of the side hole, it is easy to generate eddies or turbulence. These eddies and turbulence not only increase the scouring force of the molten steel on the edge of the side hole, but also may cause inclusions and bubbles in the molten steel to accumulate near the side hole, further aggravating the degree of scouring erosion. Secondly, the size and shape of the side hole have a significant effect on the degree of scouring erosion. Although larger side holes can better disperse the molten steel, they also mean a larger scouring area, which is more susceptible to direct scouring by the molten steel. Sharp or irregular side hole edges may produce more severe turbulence and eddies, making these areas more susceptible to erosion.

[0006] Therefore, it is necessary to invent an erosion-resistant immersed water outlet to solve the above problems. Utility Model Content

[0007] The utility model aims to provide an immersion nozzle which is resistant to scour so as to solve the problems in the above-mentioned technology.

[0008] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a scour-resistant immersed water inlet, comprising a bowl mouth section, a transition section, a slag line section and a diverter assembly, wherein the transition section is fixedly connected to the bottom of the bowl mouth section, the slag line section is fixedly connected to the bottom of the transition section, the slag line section is bell-shaped, the inner diameter of the bottom of the slag line section is larger than the inner diameter of the top of the slag line section, the diverter assembly is arranged inside the slag line section, the diverter assembly consists of a diverter cone and a connecting rod, the diverter cone is arranged on the central axis of the slag line section, one end of the connecting rod is fixedly connected to the surface of the diverter cone, and the other end of the connecting rod is embedded in the inner wall of the slag line section.

[0009] This design achieves effective dispersion of molten steel and flow rate reduction by designing the slag line segment into a bell shape and setting a diversion component inside the slag line segment, which helps to reduce the scouring and erosion of the nozzle by the molten steel, thereby increasing the service life of the nozzle.

[0010] Preferably, an anti-impact ring is fixedly connected to the inner wall of the bowl mouth section, and the anti-impact ring is made of zirconium oxide material.

[0011] By arranging an impact-resistant ring made of zirconium oxide material on the inner wall of the bowl mouth section, the resistance of the bowl mouth section to the impact of molten steel is enhanced. Zirconia material has excellent wear resistance and impact resistance, and can effectively extend the service life of the bowl mouth section.

[0012] Preferably, a first corrosion-resistant layer is fixedly connected to the inner wall of the transition section, and a second corrosion-resistant layer is fixedly connected to the inner wall of the slag line section.

[0013] No. 1 and No. 2 corrosion-resistant layers are respectively arranged on the inner walls of the transition section and the slag line section, which improves the corrosion resistance of the nozzle to molten steel and slag liquid, which helps to reduce erosion and damage of the nozzle during use and ensure its stable operation.

[0014] Preferably, the thickness of the No. 1 corrosion-resistant layer is twice the thickness of the No. 2 corrosion-resistant layer, and both the No. 1 corrosion-resistant layer and the No. 2 corrosion-resistant layer are made of aluminum-zirconium-carbon material.

[0015] The thickness of the No. 1 erosion-resistant layer is twice that of the No. 2 erosion-resistant layer. This design takes into account the different characteristics of the transition section and the slag line section in terms of erosion and erosion by molten steel. The transition section, as the connecting part between the bowl mouth section and the slag line section, is more severely eroded and corroded. Therefore, a thicker erosion-resistant layer is used to provide stronger protection.

[0016] Preferably, the splitter cone and the connecting rod surface are both fixedly connected with an impact-resistant layer, and the impact-resistant layer is made of zirconium oxide material.

[0017] By providing an impact-resistant layer made of zirconium oxide material on the surface of the diverter cone and the connecting rod, the resistance of these two components to molten steel erosion is further enhanced, which helps to reduce damage to the diverter assembly during use and ensures its long-term stable operation.

[0018] Preferably, the diverter cone and the connecting rod are integrally formed, and both the diverter cone and the connecting rod are made of nickel-chromium alloy material.

[0019] The splitter cone and connecting rod are integrally formed and made of nickel-chromium alloy, which enhances the integrity and strength of the components. Nickel-chromium alloy has excellent heat resistance and corrosion resistance and is suitable for high-temperature and highly corrosive continuous casting environments.

[0020] Preferably, the number of the connecting rods is set to four, and the four connecting rods are distributed in a ring array around the outer surface of the diverter cone.

[0021] By arranging four connecting rods distributed in a circular array around the outer surface of the diverter cone, stable support and fixation of the diverter cone is achieved. This design helps to reduce the shaking and deformation of the diverter cone under the scouring of molten steel and maintain its stable working state.

[0022] Preferably, the diverter assembly is arranged close to the bottom end of the slag line segment, and the tip of the diverter cone is arranged upward.

[0023] Placing the diverter assembly close to the bottom end of the slag line segment and making the tip of the diverter cone face upwards helps to better disperse and guide the flow of molten steel.

[0024] In the above technical solution, the technical effects and advantages provided by the utility model are:

[0025] 1. The bell-shaped design of the slag line segment and the diversion components set inside work together to significantly optimize the flow state of molten steel. The inner diameter of the bottom of the slag line segment is larger than the inner diameter of the top. This gradually expanding design helps to slow down the flow rate of molten steel and reduce scouring. At the same time, the setting of the diversion cone can effectively divert the molten steel, so that the molten steel flows into the crystallizer more evenly, avoiding excessive local scouring. This design not only improves the quality of the ingot, but also reduces the scouring erosion of the nozzle and prolongs the service life;

[0026] 2. The impact-resistant ring on the inner wall of the bowl mouth section, the erosion-resistant layer on the inner wall of the transition section and slag line section, and the impact-resistant layer on the surface of the diverter cone and the connecting rod jointly enhance the erosion and corrosion resistance of the nozzle. The impact-resistant ring and the impact-resistant layer are made of zirconium oxide material with excellent wear resistance and impact resistance, which can effectively resist the erosion of molten steel. The corrosion-resistant layer is made of aluminum zirconium carbon material, which has excellent corrosion resistance and can prevent erosion of molten steel and slag liquid on the nozzle. These design measures jointly improve the overall performance of the nozzle, making it more stable and reliable during the continuous casting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the overall structure of the utility model from a first viewing angle;

[0028] Figure 2 This is a schematic diagram of the overall structure of the utility model from a second viewing angle;

[0029] Figure 3 It is a structural sectional view of the utility model;

[0030] Figure 4 For this utility model Figure 3 A magnified view of the structure of part A;

[0031] Figure 5 It is a structural cross-sectional view of the diversion component of the utility model.

[0032] Description of reference numerals:

[0033] 1. Bowl-mouth section; 2. Transition section; 3. Slag line section; 4. Diversion assembly; 5. Diversion cone; 6. Connecting rod; 7. Impact-resistant ring; 8. No. 1 erosion-resistant layer; 9. No. 2 erosion-resistant layer; 10. Impact-resistant layer. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0035] The utility model provides Figure 1-5 A scour-resistant immersed water inlet shown includes a bowl mouth section 1, a transition section 2, a slag line section 3 and a diverter assembly 4. The transition section 2 is fixedly connected to the bottom of the bowl mouth section 1, the slag line section 3 is fixedly connected to the bottom of the transition section 2, the slag line section 3 is bell-shaped, the inner diameter of the bottom of the slag line section 3 is larger than the inner diameter of the top of the slag line section 3, the diverter assembly 4 is arranged inside the slag line section 3, the diverter assembly 4 consists of a diverter cone 5 and a connecting rod 6, the diverter cone 5 is arranged on the central axis of the slag line section 3, one end of the connecting rod 6 is fixedly connected to the surface of the diverter cone 5, and the other end of the connecting rod 6 is embedded in the inner wall of the slag line section 3.

[0036] In one aspect of the present embodiment, an impact-resistant ring 7 is fixedly connected to the inner wall of the bowl-mouth section 1, and the impact-resistant ring 7 is made of zirconia material. A No. 1 corrosion-resistant layer 8 is fixedly connected to the inner wall of the transition section 2. A No. 2 corrosion-resistant layer 9 is fixedly connected to the inner wall of the slag line section 3. The thickness of the No. 1 corrosion-resistant layer 8 is twice the thickness of the No. 2 corrosion-resistant layer 9. Both the No. 1 corrosion-resistant layer 8 and the No. 2 corrosion-resistant layer 9 are made of aluminum-zirconium-carbon material. An impact-resistant layer 10 is fixedly connected to the surface of the diverter cone 5 and the connecting rod 6. The impact-resistant layer 10 is made of zirconia material. The diverter cone 5 and the connecting rod 6 are integrally formed. Both the diverter cone 5 and the connecting rod 6 are made of nickel-chromium alloy material. The number of connecting rods 6 is set to four, and the four connecting rods 6 are distributed in a circular array around the outer surface of the diverter cone 5. The diverter assembly 4 is arranged close to the bottom end of the slag line section 3, and the tip of the diverter cone 5 is arranged upward.

[0037] Working principle of this utility model:

[0038] Refer to the instruction manual Figure 1-5 In the continuous casting process, the submerged nozzle is placed in the molten steel flow, and its bowl mouth section 1 first contacts the injection flow of the tundish, and the molten steel flows into the transition section 2 through the bowl mouth section 1, and then the molten steel continues to flow into the slag line section 3. In this process, the bell-shaped design of the slag line section 3 helps to slow down the flow rate of the molten steel and disperse the molten steel to reduce the erosion of the nozzle. At the same time, the diversion component 4 inside the slag line section 3 plays a role in further dispersing the molten steel. Through the guidance of the diversion cone 5, the flow direction of the molten steel is changed, thereby optimizing the flow state of the molten steel in the crystallizer;

[0039] The impact-resistant ring 7 on the inner wall of the bowl mouth section 1 and the impact-resistant layer 10 on the surface of the diverter cone 5 and the connecting rod 6 are made of erosion-resistant material made of zirconium oxide, which greatly enhances the resistance of the nozzle to erosion by molten steel;

[0040] The first corrosion-resistant layer 8 on the inner wall of the transition section 2 and the second corrosion-resistant layer 9 on the inner wall of the slag line section 3 are made of corrosion-resistant materials of aluminum-zirconium-carbon, which can effectively prevent erosion of the nozzle by molten steel and slag liquid;

[0041] The bell-shaped design of the slag line segment 3 and the internal diversion component 4 work together to optimize the flow state of the molten steel in the crystallizer, which is beneficial to reduce the formation of eddy currents and turbulence, thereby reducing the scouring and erosion of the water inlet.

Claims

1. An erosion-resistant submerged nozzle, comprising a bowl-mouth section (1), a transition section (2), a slag line section (3) and a flow diversion component (4), characterized in that: The transition section (2) is fixedly connected to the bottom of the bowl-mouth section (1); the slag line section (3) is fixedly connected to the bottom of the transition section (2); the slag line section (3) is bell-shaped; the inner diameter of the bottom of the slag line section (3) is larger than the inner diameter of the top of the slag line section (3); the diverter assembly (4) is arranged inside the slag line section (3); the diverter assembly (4) is composed of a diverter cone (5) and a connecting rod (6); the diverter cone (5) is arranged on the central axis of the slag line section (3); one end of the connecting rod (6) is fixedly connected to the surface of the diverter cone (5); and the other end of the connecting rod (6) is embedded in the inner wall of the slag line section (3).

2. The erosion-resistant submerged nozzle according to claim 1, characterized in that: An impact-resistant ring (7) is fixedly connected to the inner wall of the bowl mouth section (1), and the impact-resistant ring (7) is made of zirconium oxide material.

3. The erosion-resistant submerged nozzle according to claim 1, characterized in that: The inner wall of the transition section (2) is fixedly connected to a first corrosion-resistant layer (8), and the inner wall of the slag line section (3) is fixedly connected to a second corrosion-resistant layer (9).

4. The erosion-resistant submerged nozzle according to claim 3, characterized in that: The thickness of the first corrosion-resistant layer (8) is twice the thickness of the second corrosion-resistant layer (9), and both the first corrosion-resistant layer (8) and the second corrosion-resistant layer (9) are made of aluminum-zirconium-carbon material.

5. The erosion-resistant submerged nozzle according to claim 1, characterized in that: The surfaces of the splitter cone (5) and the connecting rod (6) are both fixedly connected with an impact-resistant layer (10), and the impact-resistant layer (10) is made of zirconium oxide material.

6. The erosion-resistant submerged nozzle according to claim 1, characterized in that: The diverter cone (5) and the connecting rod (6) are integrally formed, and both the diverter cone (5) and the connecting rod (6) are made of nickel-chromium alloy material.

7. The erosion-resistant submerged nozzle according to claim 1, characterized in that: The number of the connecting rods (6) is set to four, and the four connecting rods (6) are distributed in a ring array around the outer surface of the diverter cone (5).

8. The erosion-resistant submerged nozzle according to claim 1, characterized in that: The diverter assembly (4) is arranged close to the bottom end of the slag line segment (3), and the tip of the diverter cone (5) is arranged upward.

Images