A nitrogen-carbon composite water-cooled feeding device with long service life

Abstract

The invention discloses a nitrogen-carbon composite water-cooled feeding device with a long service life, which relates to the field of metallurgical technology, including a feeding port, a cavity is provided inside the feeding port, a cooling pipe is fixedly installed in the cavity, there are multiple cooling pipes, the input ends of the multiple cooling pipes are fixedly connected with a branch pipe one, the outer wall of the branch pipe one is provided with a throttling device, a dovetail groove is provided at the bottom of the feeding port, a clamping block is clamped inside the dovetail groove, and a high-temperature resistant ring is fixedly connected to the lower surface of the clamping block. In the present invention, the design of the high-temperature resistant ring makes the connection between the feeding port and the converter furnace mouth more resistant to high temperatures, and the high temperature resistance can reach 1800 degrees Celsius, achieving high temperature resistance and wear resistance, and can avoid high-temperature creep phenomenon at the feeding port. The design of the dovetail groove and the clamping block improves the connectivity between the high-temperature resistant ring and the feeding port, and avoids the falling off of the high-temperature resistant ring.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgy, and in particular to a nitrogen-carbon composite water-cooled feeding device with a long service life. Background Art

[0002] Oxygen lance and feed port are key equipment for the normal production of converters, and their working conditions directly affect the normal operation of the steelmaking process. The main functions of the oxygen lance and feed port are to add auxiliary raw materials to the converter through the feed port and blow oxygen into the converter through the oxygen lance during converter smelting. Since the oxygen lance and feed port are in a high-temperature working environment of 1400℃ for a long time, and since the high-temperature resistant alloy cannot withstand such a high temperature, the bottom of the feed port will soon burn and leak smoke, and must be effectively cooled to work normally.

[0003] A Chinese patent document with authorization announcement number CN103131819B discloses a cooling structure for a converter oxygen lance and a feed port, which states that "it includes: an oxygen lance sleeve and a feed port sleeve, the feed port sleeve includes: an annular feed port sleeve lower header box welded to the converter flue wall, feed port sleeve branch pipes densely arranged along the circumference of the annular end face of the feed port sleeve lower header box, and the other end of the densely arranged feed port sleeve branch pipes is connected to the same annular feed port sleeve upper header box." Due to the increased cooling effect, the device reduces the failure rate of the feed port and oxygen, reduces maintenance time, and improves productivity. The equipment life is also significantly improved, reducing production costs. What is important is that the heat is effectively utilized through the waste heat boiler, which reduces thermal pollution emissions and improves thermal energy utilization.

[0004] However, in combination with the prior art, the following defects or problems still exist: First, although the above-mentioned feed port reduces the temperature of the feed port by adding a cooling structure, thereby increasing the service life of the feed port, the bottom end of the feed port extends to the inside of the converter flue, and the cooling structure has a cooling blind spot; second, the above-mentioned feed port is designed through the oxygen gun sleeve upper header, and the cooling water flows into the oxygen gun sleeve branch pipe through the oxygen gun sleeve upper header, but the positions of the oxygen gun sleeve branch pipes are different, and some oxygen gun sleeve branch pipes are closer to the water inlet. Due to the influence of the water pressure difference, it is easy to cause the water flow rate at this location to be greater than the oxygen gun sleeve branch pipe far away from the water inlet, which is easy to cause the flow rate of each oxygen gun sleeve branch pipe to be uneven, thereby affecting the cooling effect. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a nitrogen-carbon composite water-cooled feeding device with a long service life.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A nitrogen-carbon composite water-cooled feeding device with a long service life comprises a feeding port, a cavity is provided inside the feeding port, a cooling pipe is fixedly installed in the cavity of the feeding port, there are multiple cooling pipes, the input ends of the multiple cooling pipes are fixedly connected to branch pipe 1, the outer wall of branch pipe 1 is provided with a throttling device, the throttling device comprises a throttling block, a throttling hole is provided inside the throttling block, both ends of the throttling block are fixedly connected to a protective ring, the other end of the protective ring is fixedly connected to the port of branch pipe 1, the other end of branch pipe 1 is fixedly connected to main pipe 1, the input end of main pipe 1 is fixedly connected to a water inlet pipe, the output ends of the multiple cooling pipes are fixedly connected to branch pipe 2, the other end of branch pipe 2 is fixedly connected to main pipe 2, the output end of main pipe 2 is fixedly connected to a drain pipe, a dovetail groove is provided at the bottom of the feeding port, a card block is clamped inside the dovetail groove, and a high-temperature resistant ring is fixedly connected to the lower surface of the card block.

[0008] Preferably, the feed opening is cylindrical, the top of the feed opening is horizontally arranged, and a flange is welded at the top opening of the feed opening.

[0009] Preferably, the bottom port of the feed opening is tilted, and the tilt angle of the bottom port of the feed opening is 30°-40°. A mounting plate is welded to the bottom port of the feed opening, and a plurality of through holes are provided on the outer wall of the mounting plate.

[0010] Preferably, the cooling pipe is a U-shaped pipe, which is formed by bending a vertical steel pipe, and a plurality of the cooling pipes are arranged equidistantly along the center of the discharge port.

[0011] Preferably, the main pipe one is located outside the discharge port, the branch pipe one is located between the discharge port and the main pipe one, the main pipe two is located outside the discharge port, the branch pipe two is located between the discharge port and the main pipe two, and the main pipe one and the main pipe two are both hexagonal.

[0012] Preferably, the inner wall of the discharge port is provided with a plurality of equally spaced guide blocks, the guide blocks are serrated, and the surfaces of the guide blocks are covered with high chromium wear-resistant material by surfacing.

[0013] Preferably, the size of the clamping block matches that of the dovetail groove, and the high temperature resistant ring and the clamping block are integrally formed and are both made of nitrogen-carbon composite material.

[0014] The beneficial effects of the present invention are:

[0015] 1. In the present invention, through the design of the high-temperature resistant ring, the connection between the feed port and the converter furnace port is more resistant to high temperatures, and the high temperature resistance can reach 1800 degrees Celsius, achieving high temperature resistance and wear resistance, and can avoid high-temperature creep at the feed port. Through the design of the dovetail groove and the clamping block, the connectivity between the high-temperature resistant ring and the feed port is improved, and the falling off of the high-temperature resistant ring is avoided.

[0016] 2. In the present invention, by setting a throttling device, the flow in branch pipe 1 will form a local reduced diameter state at the throttling device, and the static pressure is reduced. By setting different through holes, the flow rate of the fluid medium is adjusted, and the different flow rates and flow rates of cooling water in the cooling pipe caused by the pressure difference on the upper branch pipe 1 are solved, ensuring that branch pipes 1 at different positions can have a stable amount of cooling water, thereby avoiding the phenomenon of gasification caused by uneven cooling and heating of the cooling pipe, thereby improving the cooling effect.

[0017] 3. In the present invention, a plurality of equally spaced guide blocks are arranged on the inner wall of the discharge port, the guide blocks are serrated, and the surfaces of the guide blocks are covered with high-chromium wear-resistant material by surfacing welding, so that an erosion-resistant protective layer is formed on the surface of the guide blocks, thereby improving the service life of the discharge port.

[0018] 4. In the present invention, the cooling pipe is formed as a whole by bending a vertical steel pipe, thereby reducing welding between pipes and making the pipe less likely to crack and leak. The cooling pipe is pre-buried in the mold cavity, and branch pipe one and branch pipe two are placed outside the mold. They are fixed by special tools and then cast, so that the cooling pipe and the feed port are formed as a whole, so that there is no welding joint on the inside of the feed port, the high temperature resistance is improved, the influence of high temperature is small, and cracking is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a schematic structural diagram of a nitrogen-carbon composite water-cooled feeding device with a long service life.

[0020] Figure 2 A nitrogen-carbon composite water-cooled feeding device with a long service life according to the present invention Figure 1 Schematic diagram of the local structure at point A in the middle.

[0021] Figure 3 A nitrogen-carbon composite water-cooled feeding device with a long service life according to the present invention Figure 1 Cross-sectional view at AA in the middle.

[0022] Figure 4 The present invention is a schematic structural diagram of a throttling device for a nitrogen-carbon composite water-cooled feeding device with a long service life.

[0023] Figure 5 A nitrogen-carbon composite water-cooled feeding device with a long service life according to the present invention Figure 1 Cross-sectional view at BB.

[0024] Figure 6 The present invention is a schematic structural diagram of a cooling tube of a nitrogen-carbon composite water-cooled feeding device with a long service life.

[0025] Numbers in the figure: 1. Feeding port; 2. Cooling pipe; 3. Branch pipe 1; 4. Main pipe 1; 5. Branch pipe 2; 6. Main pipe 2; 7. Guide block; 8. Flange; 9. Mounting plate; 10. High temperature resistant ring; 11. Dovetail groove; 12. Block; 13. Water inlet pipe; 14. Drain pipe; 15. Throttling device; 151. Throttling block; 152. Protective ring; 153. Throttling hole. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0027] Example:

[0028] As attached Figure 1 To Attachment Figure 5 As shown:

[0029] A nitrogen-carbon composite water-cooled feeding device with a long service life comprises a feeding port 1, a cavity is provided inside the feeding port 1, a cooling pipe 2 is fixedly installed in the cavity of the feeding port 1, there are multiple cooling pipes 2, the cooling pipes 2 are U-shaped pipes, the U-shaped pipes are formed by bending a vertical steel pipe, multiple cooling pipes 2 are arranged equidistantly along the center of the feeding port 1, the cooling pipes 2 are cast in the feeding port 1, and thus are integrally cast with the feeding port 1;

[0030] The input ends of the plurality of cooling pipes 2 are all fixedly connected with a branch pipe 3, and a throttling device 15 is arranged on the outer wall of the branch pipe 3. The throttling device 15 includes a throttling block 151, and a throttling hole 153 is provided inside the throttling block 151. The apertures of the throttling holes 153 at different positions are different. The closer to the water inlet pipe 13, the smaller the aperture of the through hole. Both ends of the throttling block 151 are fixedly connected with a protective ring 152, and the other end of the protective ring 152 is fixedly connected to the port of the branch pipe 3. The design of the protective ring 152 improves the connection strength between the branch pipe 3 and the throttling block 151 The protection ring 152 is connected with the branch pipe 13 and the throttling block 151 by tungsten inert gas arc welding. By setting the throttling device 15, the flow beam in the branch pipe 3 will form a local reduced diameter state at the throttling device 15, and the static pressure is reduced. By setting different through holes, the flow rate of the fluid medium is adjusted to solve the different flow rates and flow rates of the cooling water in the cooling pipe 2 caused by the pressure difference on the upper branch pipe 3, and ensure that the branch pipes 3 at different positions can have a stable amount of cooling water, thereby avoiding the phenomenon of gasification caused by uneven hot and cold in the cooling pipe 2, thereby improving the cooling effect;

[0031] The other end of the branch pipe 3 is fixedly connected to the main pipe 4, the input end of the main pipe 4 is fixedly connected to the water inlet pipe 13, the output ends of the multiple cooling pipes 2 are fixedly connected to the branch pipe 2 5, the other end of the branch pipe 2 5 is fixedly connected to the main pipe 2 6, the output end of the main pipe 2 6 is fixedly connected to the drain pipe 14, the main pipe 4 is located outside the feeding port 1, the branch pipe 3 is located between the feeding port 1 and the main pipe 4, the main pipe 2 6 is located outside the feeding port 1, the branch pipe 2 5 is located between the feeding port 1 and the main pipe 2 6, the main pipe 4 and the main pipe 2 6 are both hexagonal, the bottom of the feeding port 1 is provided with a dovetail groove 11, the inside of the dovetail groove 11 is clamped with a clamping block 12, the lower surface of the clamping block 12 is fixedly connected with a high temperature resistant ring 10, the size of the clamping block 12 matches the dovetail groove 11, the high temperature resistant ring 10 and the clamping block 12 are integrally formed, and are both made of nitrogen-carbon composite materials;

[0032] The feeding port 1 is cylindrical, the top of the feeding port 1 is horizontally arranged, a flange 8 is welded at the top opening of the feeding port 1, the bottom port of the feeding port 1 is tilted, the tilt angle of the bottom port of the feeding port 1 is 30°-40°, a mounting plate 9 is welded at the bottom port of the feeding port 1, a plurality of through holes are opened on the outer wall of the mounting plate 9, and the feeding port 1 is fixedly installed at the converter furnace mouth through the mounting plate 9;

[0033] The inner wall of the discharge port 1 is provided with a plurality of equally spaced guide blocks 7, which are serrated and have their surfaces welded with high-chromium wear-resistant material to form an erosion-resistant protective layer on the surface of the guide blocks 7, thereby increasing the service life of the discharge port 1.

[0034] The specific usage and function of this embodiment are as follows:

[0035] The cooling pipe 2 is formed by bending a vertical steel pipe in one piece, thereby reducing welding between pipes and making the pipe less likely to crack and leak. The feed port 1 is made of a high-temperature resistant alloy material, and the feed port 1 is cast by a mold. The two ends of the cooling pipe 2 are welded to the ports of the branch pipe 2 5 and the branch pipe 1 3. The cooling pipe 2 is pre-buried in the mold cavity of the mold, and the branch pipe 1 3 and the branch pipe 2 5 are fixed to the outside of the mold by special tools, and then cast, so that the cooling pipe 2 and the feed port 1 are formed in one piece, so that there is no welding joint inside the feed port 1, the high temperature resistance is improved, the influence of high temperature is small, and cracking is avoided;

[0036] During installation, the feed opening 1 is fixedly installed at the converter furnace mouth through the mounting plate 9, and the high temperature resistant ring 10 extends into the furnace mouth. The design of the high temperature resistant ring 10 makes the connection between the feed opening 1 and the converter furnace mouth more resistant to high temperatures, and the high temperature resistance can reach 1800 degrees Celsius, which is much higher than the high temperature resistance of the feed opening 1. The design of the dovetail groove 11 and the clamping block 12 improves the connectivity and prevents the high temperature resistant ring 10 from falling off.

[0037] When the device is used, various auxiliary materials enter the converter through the feed port 1, cooling water enters the main pipe 1 4 through the water inlet pipe 13, and then flows into the cooling pipe 2 through the branch pipe 1 3, and the feed port 1 is cooled by the cooling pipe 2. The heated cooling water enters the main pipe 2 6 through the branch pipe 2 5 and is discharged through the drain pipe 14;

[0038] By setting the throttling device 15, the flow in the branch pipe 3 will form a local reduced diameter state at the throttling device 15, and the static pressure is reduced. The apertures of the throttling holes 153 located at different positions are different. The closer to the water inlet pipe 13, the smaller the aperture of the through hole. By setting different through hole apertures, the flow rate of the fluid medium is adjusted, and the different flow rates and flow rates of the cooling water in the cooling pipe 2 caused by the pressure difference on the upper branch pipe 3 are solved, ensuring that the branch pipes 3 at different positions can have a stable amount of cooling water, thereby avoiding the phenomenon of gasification caused by uneven cooling and heating of the cooling pipe 2, thereby improving the cooling effect.

[0039] For the above structure and process, please refer to Figure 1-6 .

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0042] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A nitrogen-carbon composite water-cooled feeding device with a long service life, comprising a feeding port (1), characterized in that: A cavity is provided inside the feed opening (1), and a cooling pipe (2) is fixedly installed in the cavity of the feed opening (1). There are multiple cooling pipes (2), and the input ends of the multiple cooling pipes (2) are fixedly connected to branch pipes (3). A throttling device (15) is provided on the outer wall of branch pipes (3). The throttling device (15) comprises a throttling block (151), and a throttling hole (153) is provided inside the throttling block (151). Both ends of the throttling block (151) are fixedly connected to protective rings (152), and the other end of the protective ring (152) is connected to the port of branch pipe (3). The other end of the branch pipe 1 (3) is fixedly connected to the main pipe 1 (4), the input end of the main pipe 1 (4) is fixedly connected to the water inlet pipe (13), the output ends of the plurality of cooling pipes (2) are all fixedly connected to the branch pipe 2 (5), the other end of the branch pipe 2 (5) is fixedly connected to the main pipe 2 (6), the output end of the main pipe 2 (6) is fixedly connected to the drain pipe (14), a dovetail groove (11) is provided at the bottom of the discharge port (1), a block (12) is clamped inside the dovetail groove (11), and a high temperature resistant ring (10) is fixedly connected to the lower surface of the block (12); The discharge port (1) is cylindrical, the top of the discharge port (1) is arranged horizontally, and a flange (8) is welded at the top opening of the discharge port (1); The size of the clamping block (12) matches that of the dovetail groove (11); the high temperature resistant ring (10) and the clamping block (12) are integrally formed and are both made of a nitrogen-carbon composite material.

2. A nitrogen-carbon composite water-cooled feeding device with a long service life according to claim 1, characterized in that: The bottom port of the feed opening (1) is arranged to be inclined, and the inclination angle of the bottom port of the feed opening (1) is 30°-40°. A mounting plate (9) is welded to the bottom port of the feed opening (1), and a plurality of through holes are formed on the outer wall of the mounting plate (9).

3. A nitrogen-carbon composite water-cooled feeding device with a long service life according to claim 2, characterized in that: The cooling pipe (2) is a U-shaped pipe formed by bending a vertical steel pipe, and a plurality of cooling pipes (2) are arranged equidistantly along the center of the discharge port (1).

4. The nitrogen-carbon composite water-cooled feeding device with a long service life according to claim 1 is characterized in that: The main pipe one (4) is located outside the discharge port (1), the branch pipe one (3) is located between the discharge port (1) and the main pipe one (4), the main pipe two (6) is located outside the discharge port (1), the branch pipe two (5) is located between the discharge port (1) and the main pipe two (6), and the main pipe one (4) and the main pipe two (6) are both hexagonal.

5. The nitrogen-carbon composite water-cooled feeding device with a long service life according to claim 1 is characterized in that: The inner wall of the feed opening (1) is provided with a plurality of equally spaced guide blocks (7), the guide blocks (7) being sawtooth-shaped, and the surfaces of the guide blocks (7) being covered with high-chromium wear-resistant material by surfacing welding.

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