A converter inlet open flame slag removal oxygen nozzle

Abstract

This utility model relates to an oxygen nozzle for slag removal at the converter mouth. It includes a nozzle body comprising a nozzle pipe, a ramp at the lower edge of the nozzle pipe, a return plate at the lower edge of the ramp, a baffle at the upper inner end of the nozzle pipe, and a flow guide diffuser located below the baffle inside the nozzle pipe. The flow guide diffuser is connected to the baffle via a connector, and an adjusting shim is provided between the flow guide diffuser and the baffle. A cooling water flow stabilizing plate is fitted onto the outer wall of the nozzle pipe, and an umbrella-shaped flow guide plate is located at the lower end of the flow guide diffuser, forming a spray channel between the umbrella-shaped flow guide plate and the ramp. This utility model, through the nozzle body used for slag removal at the converter mouth, and by setting spray holes of different diameters and angles, can effectively clean slag deposits of different thicknesses and hardnesses at different parts of the mouth, improving the accuracy and efficiency of slag removal.

Description

Technical Field

[0001] This utility model relates to a nozzle, and more particularly to a converter mouth open flame slag cleaning oxygen nozzle, belonging to the technical field of converter steelmaking equipment. Background Technology

[0002] Converter steelmaking is a steelmaking method that uses molten iron as the main raw material. Oxygen (or air) is blown into the molten iron, and the heat generated by the reaction of elements such as carbon, silicon, manganese, and phosphorus in the molten iron with the oxygen completes the smelting process. Its core principle is to remove impurities from the molten iron through oxidation reactions (such as carbon being oxidized to carbon monoxide and discharged, and phosphorus and sulfur forming slag and separating). Simultaneously, by adjusting the amount of slagging agents (such as lime) and coolants (such as scrap steel), the composition and temperature of the molten steel are controlled within a target range. Converters can be classified as acidic or basic according to the furnace lining material, with basic converters currently being the main type used in industry. According to the oxygen supply method, there are top-blown, bottom-blown, and top-and-bottom combined-blown types, among which top-and-bottom combined-blown converters are widely used due to their high reaction efficiency and stable steel quality.

[0003] During converter steelmaking, slag easily accumulates at the furnace mouth, which affects the normal operation of the converter and steelmaking efficiency. Currently common slag cleaning methods have some problems, such as manual slag cleaning being labor-intensive, inefficient, and posing safety hazards. Although some existing slag cleaning devices have improved slag cleaning efficiency to some extent, they are not effective at cleaning slag in complex areas of the furnace mouth, and the accuracy and speed of slag cleaning still need to be improved. Therefore, developing a high-efficiency and accurate converter furnace mouth slag cleaning nozzle is of great practical significance. Utility Model Content

[0004] The purpose of this invention is to provide a converter inlet flat flame slag cleaning oxygen nozzle to solve the defects mentioned in the background art.

[0005] To achieve the above objectives, a converter inlet flat flame slag cleaning oxygen nozzle is provided, comprising a nozzle body, the nozzle body including a nozzle pipe, the lower edge of the nozzle pipe having an outwardly extending inclined plate, the outer side of the lower edge of the inclined plate having an upward reflux plate, the upper inner end of the nozzle pipe having a baffle plate, the baffle plate having a plurality of injection holes located on the same circumference, the nozzle pipe having a flow guide diffuser located below the baffle plate, the flow guide diffuser being connected to the baffle plate via a connector, an adjusting shim being provided between the flow guide diffuser and the baffle plate, a cooling water flow stabilizing orifice plate being sleeved on the outer wall of the nozzle pipe, the cooling water flow stabilizing orifice plate having a plurality of water passage holes located on the same circumference, the lower end of the flow guide diffuser having an umbrella-shaped flow guide plate, the umbrella-shaped flow guide plate and the inclined plate forming an injection channel, the outer wall of the flow guide diffuser and the inner wall of the nozzle pipe forming an annular cavity communicating with the injection channel and injection holes.

[0006] As a further improvement to the above technical solution, the rear end of the return plate is connected to the nozzle outer tube, the rear end of the nozzle is connected to the oxygen tube, the rear end of the outer circumference of the cooling water flow stabilizing orifice plate is connected to the cooling water inlet pipe, the water passage is connected to the interior of the cooling water inlet pipe, and the central axes of the nozzle outer tube, the oxygen tube and the cooling water inlet pipe are on the same straight line.

[0007] As a further improvement to the above technical solution, the connector includes a T-bolt and a nut, a first through hole is provided at the center of the partition, a second through hole is provided at the center of the flow diffuser, and the T-bolt passes through the first through hole and the second through hole and is connected to the nut.

[0008] As a further improvement to the above technical solution, a number of annular grooves are provided on the outer wall of the rear end of the oxygen tube, and an O-ring is placed in the annular groove.

[0009] As a further improvement to the above technical solution, a cavity is provided at the center of the lower end face of the partition, and a boss that mates with the cavity is provided on the upper end face of the flow diffuser. The adjusting shim is located between the cavity and the boss and is fitted onto the T-bolt.

[0010] As a further improvement to the above technical solution, the injection pressure of the injection channel is inversely proportional to the thickness of the adjusting shim.

[0011] As a further improvement to the above technical solution, a cooling water inlet channel is formed between the cooling water inlet pipe and the oxygen pipe, and a cooling water outlet channel is formed between the nozzle outer pipe and the cooling water inlet pipe.

[0012] As a further improvement to the above technical solution, the nozzle body's nozzle pipe, baffle, inclined plate, and return plate are an integrated structure.

[0013] The advantages of this utility model are:

[0014] 1. This utility model uses a nozzle body for slag removal at the converter furnace mouth. By setting spray holes of different diameters and angles, it can effectively clean slag deposits of different thicknesses and hardnesses at different parts of the furnace mouth, improving the accuracy and efficiency of slag removal. The nozzle body is designed to adjust the flow rate and spray force under fixed pressure, adapting to different slag formation scenarios and capable of handling any slag formation situation.

[0015] 2. Due to the limitation of the injection hole diameter, oxygen is compressed to a higher velocity, thus forming circular jets of different directions and intensities. For thicker and harder slag, the thickness of the adjusting shims can be changed to achieve multiple different airflow velocities and change the gas flow rate under the same pressure by adjusting the fixed connection height of the flow guide diffuser, thereby effectively and specifically impacting and cleaning the slag at the furnace mouth.

[0016] 3. By using this nozzle body for slag cleaning, this utility model can significantly increase the online working time of the equipment, reduce the frequency of equipment replacement, reduce the labor intensity of workers, and reduce the safety hazards caused by manual slag cleaning, thus providing a guarantee for the efficient production of the converter. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 yes Figure 1 Schematic diagram of the direction of cooling water flow.

[0019] Figure 3 yes Figure 1 Schematic diagram of the direction of oxygen flow in medium and high pressure systems.

[0020] Figure 4 yes Figure 1 Top view.

[0021] In the diagram, 1 is the nozzle body, 2 is the nozzle pipe, 3 is the inclined plate, 4 is the return plate, 5 is the baffle plate, 6 is the injection hole, 7 is the flow guide diffuser, 8 is the adjusting shim, 9 is the cooling water flow stabilizing plate, 10 is the water passage hole, 11 is the umbrella-shaped flow guide plate, 12 is the injection channel, 13 is the annular cavity, 14 is the nozzle outer tube, 15 is the oxygen pipe, 16 is the cooling water inlet pipe, 17 is the T-bolt, 18 is the nut, and 19 is the O-ring seal. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-4This utility model provides a converter inlet flat flame slag cleaning oxygen nozzle, including a nozzle body 1, the nozzle body 1 including a nozzle pipe 2, the lower edge of the nozzle pipe 2 is provided with an outwardly extending inclined plate 3, the outer side of the lower edge of the inclined plate 3 is provided with an upward reflux plate 4, the upper end of the inside of the nozzle pipe 2 is provided with a baffle 5, the baffle 5 is provided with a plurality of injection holes 6 located on the same circumference, and the inside of the nozzle pipe 2 is provided with a flow guide diffuser 7 located below the baffle 5, the flow guide diffuser 7 is connected to the baffle 5 through a connector, the flow guide diffuser 7 and the... Adjustment shims 8 are provided between the partitions 5. Cooling water flow stabilizing orifice plate 9 is sleeved on the outer wall of the nozzle 2. Several water passage holes 10 located on the same circumference are opened on the cooling water flow stabilizing orifice plate 9. The lower end of the flow guide diffuser 7 is provided with umbrella-shaped flow guide plate 11. An injection channel 12 is formed between the umbrella-shaped flow guide plate 11 and the inclined plate 3. An annular cavity 13 is formed between the outer wall of the flow guide diffuser 7 and the inner wall of the nozzle 2, which is connected to the injection channel 12 and the injection hole 6. High-pressure oxygen enters into the annular cavity 13 through the injection hole 6 and is then ejected from the injection channel 12.

[0024] The nozzle body 1 and the flow diffuser 7 are made of high-strength TU1 pure copper metal material and are formed into a sloping structure by forging or machining.

[0025] The cooling water flow stabilizing orifice plate 9 is made of high-strength TU1 pure copper metal rod, which is machined by turning and milling to obtain the distribution and precision of multiple holes, and the diameter and angle of the water passage holes are strictly controlled.

[0026] As a further improvement to the above technical solution, the rear end of the return plate 4 is connected to the nozzle outer tube 14, the rear end of the nozzle 2 is connected to the oxygen tube 15, the rear end of the outer circumference of the cooling water flow stabilizing orifice plate 9 is connected to the cooling water inlet pipe 16, the water passage hole 10 is connected to the interior of the cooling water inlet pipe 16, and the central axes of the nozzle outer tube 14, the oxygen tube 15 and the cooling water inlet pipe 16 are on the same straight line.

[0027] The cooling water inlet pipe and nozzle outer pipe are made of 20G material, and the oxygen pipe is made of 304 stainless steel. The required smoothness is achieved through machining, and it has anti-tempering and corrosion-resistant properties.

[0028] Install the nozzle body onto the oxygen lance equipment's piping system via the cooling water inlet pipe, nozzle outer pipe, and oxygen pipe, ensuring a secure and well-sealed connection. Adjust the stroke pressure and flow rate of the slag removal equipment according to the specific condition of the slag buildup at the furnace mouth to achieve the best slag removal effect. Start the slag removal equipment to allow the nozzle body to clean the slag buildup at the furnace mouth. During the cleaning process, the nozzle flow rate can be adjusted according to the actual situation to cover more slag removal areas. The oxygen blowing time is 1-4 minutes per cycle, with an interval of 10-20 seconds for repeated blowing until the slag buildup at the furnace mouth is completely cleaned.

[0029] As a further improvement to the above technical solution, the connecting component includes a T-bolt 17 and a nut 18. A first through hole is provided at the center of the axis of the partition plate 5, and a second through hole is provided at the center of the axis of the flow diffuser 7. The T-bolt 17 passes through the first through hole and the second through hole and is connected to the nut 18.

[0030] The T-bolts, nuts, and adjusting shims are made of 601 alloy and are machined by turning and milling. They are characterized by high temperature resistance and high strength, making them suitable for high-temperature environments.

[0031] As a further improvement to the above technical solution, a plurality of annular grooves are provided on the outer wall of the rear end of the oxygen tube 15, and an O-ring seal 19 is placed in the annular grooves.

[0032] As a further improvement to the above technical solution, a cavity is provided at the center of the lower end face of the partition plate 5, and a boss that cooperates with the cavity is provided on the upper end face of the flow diffuser 7. The adjusting shim 8 is located between the cavity and the boss and is fitted on the T-bolt 17.

[0033] As a further improvement to the above technical solution, the injection pressure of the injection channel 12 is inversely proportional to the thickness of the adjusting shim 8.

[0034] As a further improvement to the above technical solution, a cooling water inlet channel is formed between the cooling water inlet pipe 16 and the oxygen pipe 15, and a cooling water outlet channel is formed between the nozzle outer pipe 14 and the cooling water inlet pipe 16.

[0035] As a further improvement to the above technical solution, the nozzle body 1 has a nozzle 2, baffle 5, inclined plate 3 and return plate 4 as an integrated structure.

[0036] Working principle: When the slag removal nozzle equipment is started, high-pressure oxygen enters the nozzle body through the oxygen pipe and is then ejected at high speed from the injection channel. Due to the limitation of the injection hole diameter, the oxygen is compressed to a higher speed, thus forming circular jet streams with different directions and intensities. For thicker and harder slag deposits, the thickness of the shims can be adjusted by changing the shims. Under the same pressure, multiple different airflow velocities can be achieved by adjusting the fixed connection height of the flow guide diffuser. By changing the gas flow rate, the slag deposits at the furnace mouth can be effectively and specifically impacted and cleaned.

[0037] The nozzle body used for slag removal at the converter furnace mouth can effectively clean slag deposits of different thicknesses and hardnesses at different locations in the furnace mouth by setting spray holes of different diameters and angles, thus improving the accuracy and efficiency of slag removal. The nozzle body is designed to adjust the flow rate and spray force under fixed pressure, adapting to different slag formation scenarios and capable of handling any slag formation situation.

[0038] By using this nozzle body for slag removal, the online working time of the equipment can be greatly increased, the frequency of equipment replacement can be reduced, the labor intensity of workers can be reduced, and the safety hazards caused by manual slag removal can be reduced, thus ensuring the efficient production of the converter.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A converter inlet horizontal flame slag cleaning oxygen nozzle, characterized in that, The nozzle includes a nozzle body, which includes a nozzle pipe. The lower edge of the nozzle pipe has an outwardly extending inclined plate, and the outer side of the lower edge of the inclined plate has an upward-facing return plate. The upper inner end of the nozzle pipe has a baffle plate with several injection holes on the same circumference. The nozzle pipe also has a flow guide diffuser located below the baffle plate, connected to the baffle plate via a connector. An adjusting shim is provided between the flow guide diffuser and the baffle plate. A cooling water flow stabilizing orifice plate is fitted onto the outer wall of the nozzle pipe, with several water passage holes on the same circumference. The lower end of the flow guide diffuser has an umbrella-shaped guide plate, forming a spray channel between the umbrella-shaped guide plate and the inclined plate. An annular cavity communicating with the spray channel and injection holes is formed between the outer wall of the flow guide diffuser and the inner wall of the nozzle pipe.

2. The converter inlet flame cleaning oxygen nozzle according to claim 1, characterized in that, The rear end of the return plate is connected to the nozzle outer tube, the rear end of the nozzle is connected to the oxygen tube, the rear end of the outer circumference of the cooling water flow stabilizing orifice plate is connected to the cooling water inlet pipe, the water passage is connected to the interior of the cooling water inlet pipe, and the central axes of the nozzle outer tube, the oxygen tube and the cooling water inlet pipe are on the same straight line.

3. The converter inlet flame cleaning oxygen nozzle according to claim 1, characterized in that, The connector includes a T-bolt and a nut. A first through hole is provided at the center of the partition shaft, and a second through hole is provided at the center of the flow diffuser shaft. The T-bolt passes through the first and second through holes and is connected to the nut.

4. The converter inlet flame cleaning oxygen nozzle according to claim 2, characterized in that, The oxygen tube has several annular grooves on its rear outer wall, and an O-ring seal is placed in each annular groove.

5. The converter inlet flame cleaning oxygen nozzle according to claim 1, characterized in that, The lower end face of the partition is provided with a cavity at the center, and the upper end face of the flow diffuser is provided with a boss that matches the cavity. The adjusting shim is located between the cavity and the boss and is fitted onto the T-bolt.

6. The converter inlet flame cleaning oxygen nozzle according to claim 1, characterized in that, The injection pressure in the injection channel is inversely proportional to the thickness of the adjusting shim.

7. The converter inlet flame cleaning oxygen nozzle according to claim 2, characterized in that, The cooling water inlet pipe and the oxygen pipe form a cooling water inlet channel, and the nozzle outer pipe and the cooling water inlet pipe form a cooling water outlet channel.

8. The converter inlet horizontal flame slag cleaning oxygen nozzle according to claim 1, characterized in that, The nozzle body, including the nozzle pipe, baffle, inclined plate, and return plate, is an integrated structure.

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