A dephosphorization injection device for stainless steel liquid iron pretreatment

Abstract

The application provides a dephosphorization spraying device for stainless steel molten iron pretreatment, which comprises a base, a linear module, a gantry, a lifting mechanism, a spraying mechanism, a cooling mechanism and a splash-proof slag scraping mechanism, wherein the lifting mechanism is arranged on the gantry; the spraying mechanism comprises a pipe body, a conveying assembly and a spray head assembly, wherein the pipe body is connected with the lifting mechanism; the conveying assembly is connected with the upper end of the pipe body; the spray head assembly is rotationally connected with the lower end of the pipe body; the cooling mechanism comprises a first cooling assembly and a second cooling assembly, wherein the first cooling assembly is arranged in the pipe body; the second cooling assembly is arranged in the spray head assembly; and the splash-proof slag scraping mechanism is arranged outside the pipe body. The dephosphorization spraying device for stainless steel molten iron pretreatment can automatically rotate the spray head assembly during spraying, can uniformly diffuse the powder and can enhance the stirring effect of the molten iron, so that the reaction is more sufficient and the dephosphorization efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of iron and steel metallurgical equipment technology, and in particular to a dephosphorization spraying device for stainless steel molten iron pretreatment. Background Technology

[0002] Pretreatment of molten iron for stainless steel production is a crucial step, with the core being dephosphorization before the molten iron enters the primary refining furnace to ensure the subsequent high-chromium steel refining. Due to the high chromium content of molten iron for stainless steel production and the harsh thermodynamic conditions for dephosphorization, the effectiveness of pretreatment dephosphorization directly determines product quality and production costs. As a core piece of equipment, the performance of the dephosphorization injection device is of paramount importance to dephosphorization efficiency, material utilization, equipment wear and tear, and production safety.

[0003] Currently, the mainstream industrial method for dephosphorizing molten stainless steel is the injection method. This involves injecting powdered dephosphorizing agents (such as a mixture of lime, iron oxide scale, and fluorite) into the molten iron using a carrier gas (usually nitrogen or argon) through an immersion nozzle. This allows the dephosphorizing agent to react rapidly with the molten iron, achieving dephosphorization. However, traditional nozzle mixing methods are simplistic, resulting in uneven mixing of the dephosphorizing agent and carrier gas. This can lead to particle agglomeration or powder-gas separation, preventing the dephosphorizing agent from fully contacting the molten iron. Furthermore, because the nozzle is a single nozzle, the airflow is unidirectional, resulting in weak agitation and uneven diffusion of the powder in the molten iron, creating dead zones and leading to low dephosphorization efficiency and unstable results. Additionally, the nozzle needs to be inserted into a high-temperature molten iron layer of 1350-1450℃, facing slag erosion, particle scouring, and high-temperature oxidation. Existing nozzles have simple structures and lack effective cooling and wear- and corrosion-resistant designs, making them prone to burn-out and increasing maintenance costs. Summary of the Invention

[0004] This application aims to at least partially solve one of the technical problems in the aforementioned technologies.

[0005] Therefore, one objective of this application is to provide a dephosphorization blowing device for the pretreatment of stainless steel molten iron. By optimizing the structure design of the nozzle assembly, the nozzle assembly can rotate automatically during blowing, which not only allows the powder to be evenly diffused but also enhances the stirring effect of the molten iron, making the reaction more complete and improving the dephosphorization efficiency.

[0006] To achieve the above objectives, the first aspect of this application proposes a dephosphorization spraying device for stainless steel molten iron pretreatment, comprising: a base, linear modules, a gantry frame, a lifting mechanism, a spraying mechanism, a cooling mechanism, and an anti-splash and slag scraping mechanism, wherein a converter is mounted on the base; the linear modules are installed on the upper part of the base, and the base is located between the linear modules; the gantry frame is installed on the linear modules; the lifting mechanism is disposed on the gantry frame; the spraying mechanism includes a pipe body, a conveying assembly, and a nozzle assembly, wherein the pipe body is connected to the lifting mechanism, and the pipe body is connected to the... The converter's opening corresponds to the tube body; the conveying assembly is connected to the upper end of the tube body; the nozzle assembly is rotatably connected to the lower end of the tube body, and part of the carrier gas and dephosphorizing agent can be sprayed out along its tangential direction through the nozzle assembly to form a horizontal swirling field, driving the nozzle assembly to rotate automatically; the cooling mechanism includes a first cooling assembly and a second cooling assembly, wherein the first cooling assembly is disposed inside the tube body; the second cooling assembly is disposed inside the nozzle assembly and is connected to the first cooling assembly; the anti-splash and slag scraping mechanism is disposed outside the tube body.

[0007] In addition, the dephosphorization blowing device for stainless steel molten iron pretreatment proposed in this application may also have the following additional technical features: Specifically, the lifting mechanism includes two driving components and a support plate. The two driving components are respectively mounted on the gantry frame, and their output ends pass through the gantry frame. The support plate is connected to the output ends of the two driving components, and the tube is disposed through the middle of the support plate.

[0008] Specifically, the conveying assembly includes an air inlet pipe and a feed pipe, wherein the air inlet pipe is connected to and communicates with the upper end of the pipe body; and the feed pipe is connected to and communicates with the air inlet pipe.

[0009] Specifically, the nozzle assembly includes a housing, a rotating block, a seal, a plurality of first nozzles, and a plurality of second nozzles. A rotating groove is formed at the lower end of the inner wall of the tube. The inlet end of the housing is inserted into the lower end of the tube. The rotating block is disposed on the outer wall of the inlet end of the housing and is adapted to the rotating groove. The seal is disposed on the rotating block. The plurality of first nozzles and the plurality of second nozzles are respectively disposed on the housing.

[0010] Specifically, the shell has a capsule-shaped structure, with a plurality of first nozzles arranged in a circumferential array on the annular surface of the shell, and a plurality of second nozzles arranged in a circumferential array on two spherical surfaces of the shell, with the included angle between the second nozzles and the first nozzles being 45°.

[0011] Specifically, the first cooling assembly includes a sleeve, two baffles, an inlet pipe, and an outlet pipe. The sleeve is disposed inside the pipe body, and a first interlayer is formed between the sleeve and the pipe body. The two baffles are respectively disposed inside the first interlayer and connected to the sleeve and the pipe body. The two baffles are arranged in parallel and symmetrically, with the upper end of the baffle connected to the upper wall of the pipe body and the lower end of the baffle not connected to the lower wall of the pipe body. The inlet pipe and the outlet pipe are respectively disposed on the upper end of the outer wall of the pipe body, and the inlet pipe and the outlet pipe are symmetrically arranged about the baffles.

[0012] Specifically, the second cooling assembly includes an inner liner, a sealing ring, two retaining rings, a first connecting pipe, and a second connecting pipe. The inner liner is disposed inside the housing, and a second interlayer is formed between the inner liner and the housing. The sealing ring is disposed at the upper ends of the housing and the inner liner. The two retaining rings are respectively connected to the sealing ring. The upper ends of the housing and the inner liner are respectively provided with retaining grooves, and the two retaining rings respectively cooperate with the corresponding retaining grooves to allow the sealing ring to rotate. The first connecting pipe and the second connecting pipe are respectively connected between the inner wall of the sleeve and the sealing ring, and the first connecting pipe and the second connecting pipe are respectively connected to the first interlayer and the second interlayer.

[0013] Specifically, the anti-splash and slag scraping mechanism includes multiple limiting blocks and a protective cover, wherein the multiple limiting blocks are respectively disposed at the lower end of the outer wall of the tube body; the protective cover is slidably sleeved on the outside of the tube body, and the protective cover is adapted to the furnace mouth of the converter.

[0014] Compared with the prior art, this application has the following beneficial effects: 1. By setting multiple circumferential first nozzles on the shell, the carrier gas and dephosphorizing agent are premixed after entering the shell through the pipe body, so that the dephosphorizing agent is evenly dispersed. Then, the airflow will be sprayed out through the first nozzle along the tangential direction of the shell to form a horizontal swirling field, thereby driving the nozzle assembly to rotate automatically in the molten iron. At the same time, multiple second nozzles spray multiple streams of air upward and downward at a 45° angle, which not only allows the dephosphorizing agent to be evenly diffused into the molten iron and eliminates dead corners, but also enhances the stirring effect of the molten iron. The dephosphorizing agent and the molten iron are in more sufficient contact, which significantly improves the dephosphorization reaction rate and dephosphorization effect.

[0015] 2. This application uses a cooling mechanism to continuously inject circulating water into the pipe body and nozzle assembly for cooling during the spraying of dephosphorizing agent, thereby reducing the temperature of the pipe body and nozzle assembly, which greatly reduces the risk of equipment burn-out, increases the service life of the equipment, and reduces maintenance costs.

[0016] 3. This application uses an anti-splash slag scraping mechanism to scrape off the slag adhering to the outer wall of the tube after the blowing is completed, as the tube rises. When the nozzle assembly is completely removed from the molten iron, the slag on the shell surface will be automatically thrown off under the action of centrifugal force as it rotates, thus realizing the automatic slag removal function of the equipment.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a perspective view of a dephosphorization blowing device for stainless steel molten iron pretreatment according to an embodiment of this application. Figure 1 ; Figure 2 This is a perspective view of a dephosphorization blowing device for stainless steel molten iron pretreatment according to an embodiment of this application. Figure 2 ; Figure 3 This is a front cross-sectional view of a dephosphorization blowing device for stainless steel molten iron pretreatment according to an embodiment of this application; Figure 4 This is a schematic diagram of the blowing mechanism and anti-splash scraping mechanism of a dephosphorization blowing device for stainless steel molten iron pretreatment according to an embodiment of this application; Figure 5 This is a schematic diagram of the nozzle assembly structure of a dephosphorization blowing device for stainless steel molten iron pretreatment according to an embodiment of this application.

[0019] Figure 6 This is a schematic diagram of the first cooling component of a dephosphorization blowing device for stainless steel molten iron pretreatment according to an embodiment of this application.

[0020] Figure 7 This is a schematic diagram of the second cooling component of a dephosphorization blowing device for stainless steel molten iron pretreatment according to an embodiment of this application. Figure 8 for Figure 7 Enlarged view of point A in the middle.

[0021] Reference numerals: 1. Base; 2. Linear module; 3. Gantry frame; 4. Lifting mechanism; 401. Drive component; 402. Support plate; 5. Spraying mechanism; 501. Pipe body; 502. Conveying assembly; 5021. Air inlet pipe; 5022. Feed pipe; 503. Nozzle assembly; 5031. Housing; 5032. Rotating block; 5033. Seal; 5034. First nozzle; 5035. Second nozzle 6. Cooling mechanism; 601. First cooling component; 6011. Sleeve; 6012. Baffle; 6013. Water inlet pipe; 6014. Water outlet pipe; 602. Second cooling component; 6021. Inner liner; 6022. Sealing ring; 6023. Snap ring; 6024. First connecting pipe; 6025. Second connecting pipe; 7. Anti-splash and slag scraping mechanism; 701. Limiting block; 702. Protective cover; 8. Converter. Detailed Implementation

[0022] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0023] The following describes a dephosphorization blowing device for stainless steel molten iron pretreatment according to an embodiment of this application, with reference to the accompanying drawings.

[0024] like Figures 1-8 As shown in the embodiment of this application, a dephosphorization blowing device for stainless steel molten iron pretreatment may include a base 1, a linear module 2, a gantry frame 3, a lifting mechanism 4, a blowing mechanism 5, a cooling mechanism 6, and an anti-splash and slag scraping mechanism 7.

[0025] The base 1 is equipped with a converter 8.

[0026] It should be noted that the converter 8 described in this embodiment is an existing device on the market, used to hold molten iron. It is mounted on the base 1 via two horizontal shafts and can realize the function of rotating to discharge material.

[0027] The linear module 2 is installed on the upper part of the base 1, and the base 1 is located between the linear modules 2.

[0028] The gantry 3 is installed on the linear module 2.

[0029] It should be noted that the linear module 2 described in this embodiment is a ball screw type linear module driven by a servo motor, which is an existing device on the market. It is used to drive the gantry 3 to perform horizontal displacement, and its connection method is also existing technology, so it will not be described in detail.

[0030] The lifting mechanism 4 is mounted on the gantry 3.

[0031] The spraying mechanism 5 includes a pipe body 501, a conveying assembly 502, and a nozzle assembly 503.

[0032] The tube body 501 is connected to the lifting mechanism 4 and corresponds to the furnace mouth of the converter 8. The conveying component 502 is connected to the upper end of the tube body 501, and the nozzle assembly 503 is rotatably connected to the lower end of the tube body 501. Part of the carrier gas and dephosphorizing agent can be sprayed out along its tangential direction through the nozzle assembly 503 to form a horizontal swirling field, driving the nozzle assembly 503 to rotate automatically.

[0033] It should be noted that the tube 501 described in this embodiment is vertically arranged below the gantry 3, and the axis of the tube 501 coincides with the central axis of the furnace mouth of the converter 8 to ensure the central symmetry of the injection. The tube 501 is a seamless chromium tube with good wear resistance, corrosion resistance and fire resistance.

[0034] The height of the gantry 3 is greater than the height of the two converters 8, so that after dephosphorization is completed, the lifting mechanism 4 can drive the tube 501 and the nozzle assembly 503 to rise, and cooperate with the linear module 2 to completely remove the nozzle assembly 503 from the converter 8. The converter 8 can be flipped to discharge slag and material, avoiding motion interference.

[0035] It is understandable that the conveying component 502 is connected to both an external carrier gas supply system (such as an air pump) and a dephosphorizing agent storage silo, and the dephosphorizing agent storage silo can achieve uniform discharge of the dephosphorizing agent through existing feeding mechanisms on the market.

[0036] The cooling mechanism 6 includes a first cooling component 601 and a second cooling component 602.

[0037] The first cooling component 601 is disposed inside the pipe body 501, and the second cooling component 602 is disposed inside the nozzle assembly 503, and the second cooling component 602 is connected to the first cooling component 601.

[0038] It should be noted that the first cooling component 601 described in this embodiment is connected to an external cold water supply system, so that the first cooling component 601 and the second cooling component 602 form a closed circulating water cooling circuit. The first cooling component 601 is used to continuously cool the pipe body 501, and the second cooling component 602 is used to continuously cool the nozzle assembly 503, thereby reducing the probability of the equipment being burned by the high-temperature molten iron and improving the service life of the equipment.

[0039] The anti-splash scraping mechanism 7 is located on the outside of the pipe body 501.

[0040] Understandably, the anti-splash and slag scraping mechanism 7 works in conjunction with the furnace opening of the converter 8 to prevent molten iron from splashing due to agitation. In addition, after the molten iron pretreatment is completed, the anti-splash and slag scraping mechanism 7 can scrape off the slag adhering to the outer wall of the tube body 501 during the process of the tube body 501 rising and exiting the converter 8.

[0041] Specifically, in the pretreatment stage of stainless steel molten iron, this device can be used to perform dephosphorization spraying on the molten iron, and achieve uniform diffusion of dephosphorizing agent, efficient agitation of molten iron, continuous cooling of equipment and production safety protection, thereby greatly improving dephosphorization efficiency and equipment service life, and reducing maintenance costs.

[0042] In actual operation, molten iron is first poured into converter 8 through a ladle. Then, according to the position of converter 8, the linear module 2 is activated to drive the gantry 3 to move horizontally, so that the central axis of tube 501 coincides with the central axis of converter 8, thus completing the calibration of the blowing position.

[0043] Then, the lifting mechanism 4 drives the blowing mechanism 5 to move downwards as a whole, so that the nozzle assembly 503 is inserted into the stainless steel molten iron layer in the converter 8. The insertion depth is adjusted according to the molten iron level. At the same time, the anti-splash and slag scraping mechanism 7 descends synchronously and cooperates with the furnace mouth of the converter 8 to form a closed protection to prevent molten iron splashing in the furnace from damaging the equipment and personnel.

[0044] Next, the carrier gas supply system and dephosphorizing agent storage silo are turned on. The carrier gas (such as nitrogen) and powdered dephosphorizing agent (such as a mixture of lime, iron oxide scale, and fluorite) enter the pipe body 501 through the conveying component 502. The dephosphorizing agent is rapidly dispersed during the fall process under the impact of the carrier gas in the pipe body 501, thus completing the initial premixing. Then, it enters the nozzle assembly 503 and undergoes secondary mixing in the nozzle assembly 503. The mixed powder-gas mixture is sprayed out in multiple streams along multiple different directions, forming a swirling flow field that drives the nozzle assembly 503 to rotate automatically. This achieves all-round uniform diffusion of the dephosphorizing agent in the molten iron layer and efficient agitation of the molten iron, so that the dephosphorizing agent and molten iron can fully contact each other and undergo a dephosphorization reaction. At the same time, the rotation of the nozzle assembly 503 will enhance the mixing effect of the dephosphorizing agent and the carrier gas.

[0045] While the blasting operation is underway, the cooling water supply system is activated. Cooling water enters the first cooling component 601, flows downward along the pipe 501, and enters the second cooling component 602 of the nozzle assembly 503. After cooling the pipe 501 and the nozzle assembly 503 respectively, the water flows back outward in the opposite direction, forming a water-cooled cycle. This keeps the pipe 501 and the nozzle assembly 503 at a low temperature, thereby reducing the probability of the equipment being burned by the high-temperature molten iron and extending the service life of the equipment.

[0046] After the dephosphorization reaction reaches the preset requirements, the supply of carrier gas and dephosphorizing agent is turned off. The lifting mechanism 4 drives the tube body 501 and the nozzle assembly 503 to move vertically upward and separate them from the molten iron layer. At the same time, the anti-splash slag scraping mechanism 7 scrapes off the adhering slag along the outer wall of the tube body 501. Finally, the linear module 2 drives the gantry 3 to move horizontally and moves the blowing mechanism 5 to the outside of the converter 8. The converter 8 can then be flipped to perform slag removal and pour out the molten iron.

[0047] In one embodiment of this application, such as Figure 2 As shown, the lifting mechanism 4 includes two driving components 401 and a support plate 402.

[0048] Two drive units 401 are respectively installed on the gantry 3, and their output ends pass through the gantry 3. The support plate 402 is connected to the output ends of the two drive units 401, and the tube body 501 is disposed through the middle of the support plate 402.

[0049] It should be noted that the driving component 401 described in this embodiment can be an electric actuator or a hydraulic rod. Since electric actuators or hydraulic rods are common knowledge in the field and are not part of the improved technology of this case, they will not be described in detail here.

[0050] The support plate 402 is a horizontally arranged rectangular metal plate, and the pipe body 501 can be fixedly connected to the support plate 402 by welding or flange connection.

[0051] Specifically, the two drive components 401 can drive the support plate 402 to move up and down, and the support plate 402 can drive the tube body 501 to move up and down synchronously, so as to realize the function of the nozzle assembly 503 entering and exiting the converter 8.

[0052] In one embodiment of this application, such as Figure 4 As shown, the conveying assembly 502 includes an air inlet pipe 5021 and a feed pipe 5022.

[0053] The air inlet pipe 5021 is connected to and communicates with the upper end of the pipe body 501, and the feed pipe 5022 is connected to and communicates with the air inlet pipe 5021.

[0054] It should be noted that the feed pipe 5022 and the air inlet pipe 5021 described in this embodiment are designed as a single unit, with the air inlet pipe 5021 set horizontally and the feed pipe 5022 set vertically. The upper end of the feed pipe 5022 is connected to the feeding mechanism of the dephosphorizing agent storage silo through a high-strength corrugated pipe. One end of the air inlet pipe 5021 is also connected to the air outlet of the carrier gas supply system through a high-strength corrugated pipe. The powdered dephosphorizing agent enters the pipe body 501 through the feed pipe 5022, and the carrier gas enters the pipe body 501 through the air inlet pipe 5021. After the two converge in the pipe body 501, the dephosphorizing agent will be rapidly dispersed by the impact of the carrier gas during the falling process, thereby completing the initial premixing and avoiding the agglomeration of dephosphorizing agent particles.

[0055] In one embodiment of this application, such as Figure 5 As shown, the nozzle assembly 503 includes a housing 5031, a rotating block 5032, a seal 5033, a plurality of first nozzles 5034, and a plurality of second nozzles 5035.

[0056] The lower end of the inner wall of the tube body 501 is provided with a rotating groove, the inlet end of the shell 5031 is inserted into the lower end of the tube body 501, the rotating block 5032 is provided on the outer wall of the inlet end of the shell 5031 and the rotating block 5032 is adapted to the rotating groove, the sealing element 5033 is provided on the rotating block 5032, and multiple first nozzles 5034 and multiple second nozzles 5035 are respectively provided on the shell 5031.

[0057] It should be noted that the shell 5031 described in this embodiment has a capsule-shaped structure, with multiple first nozzles 5034 arranged in a circumferential array on the annular surface of the shell 5031, and multiple second nozzles 5035 arranged in a circumferential array on two spherical surfaces of the shell 5031, and the included angle between the second nozzles 5035 and the first nozzles 5034 is 45°.

[0058] In addition, it should be noted that the seal 5033 is a high-temperature resistant graphite seal to ensure the seal at the rotatable connection between the tube body 501 and the shell 5031, and to prevent the dephosphorizing agent and carrier gas from leaking. The shell 5031, the first nozzle 5034 and the second nozzle 5035 are all made of tungsten copper alloy, which is resistant to temperatures >1600℃ and is wear-resistant and corrosion-resistant.

[0059] The first nozzle 5034 has a fan-shaped structure, and the nozzle orifice of the first nozzle 5034 is arranged along the tangential direction of the housing 5031.

[0060] Specifically, after the premixed dephosphorizing agent and carrier gas enter the shell 5031, they are sprayed out tangentially through the first nozzle 5034, forming a horizontal swirling field. The resulting reaction force drives the shell 5031 to rotate automatically around the axis of the tube 501. The rotation of the shell 5031 will cause the dephosphorizing agent and carrier gas to be mixed again in the shell 5031, avoiding particle agglomeration or powder-gas separation. At the same time, the second nozzle 5035 sprays multiple streams of air upward and downward at a 45° angle, which not only achieves uniform diffusion of the dephosphorizing agent in the molten iron layer in all directions and eliminates the dead zone of stirring, but also greatly enhances the stirring effect of the molten iron, so that the dephosphorizing agent and molten iron can fully contact each other and significantly improve the dephosphorizing reaction rate.

[0061] It is understood that the above implementation method can achieve a dephosphorizing agent utilization rate of ≥90%, an endpoint [P] of ≤0.010% and good stability, a phosphorus recovery rate of ≤1%, and reduce the splashing of molten iron caused by airflow fluctuations, so that the splashing loss is ≤3%.

[0062] In one embodiment of this application, such as Figure 6 As shown, the first cooling assembly 601 includes a sleeve 6011, two baffles 6012, an inlet pipe 6013, and an outlet pipe 6014.

[0063] The sleeve 6011 is disposed inside the pipe body 501, and a first interlayer is formed between the sleeve 6011 and the pipe body 501. Two partitions 6012 are disposed inside the first interlayer and connected to the sleeve 6011 and the pipe body 501. The two partitions 6012 are arranged in parallel and symmetrically, and the upper end of the partition 6012 is connected to the upper wall of the pipe body 501, while the lower end of the partition 6012 is not connected to the lower wall of the pipe body 501. The inlet pipe 6013 and the outlet pipe 6014 are disposed on the upper end of the outer wall of the pipe body 501, and the inlet pipe 6013 and the outlet pipe 6014 are symmetrically arranged about the partitions 6012.

[0064] It should be noted that the inlet pipe 6013 described in this embodiment is connected to the cooling water supply system via a plastic hose, and the outlet pipe 6014 is connected to the cooling water return system via a plastic hose. The sleeve 6011 is made of wear-resistant stainless steel with a corundum inner lining to ensure wear resistance. The cooling water supply system and the cooling water return system are both existing equipment on the market, and their connection methods are also existing technologies, so they will not be described in detail.

[0065] Understandably, the two baffles 6012 divide the first mezzanine into two interconnected arc-shaped channels to ensure unidirectional circulation of cooling water.

[0066] In one embodiment of this application, such as Figure 7 and Figure 8As shown, the second cooling assembly 602 includes an inner liner 6021, a sealing ring 6022, two retaining rings 6023, a first connecting pipe 6024, and a second connecting pipe 6025.

[0067] The inner liner 6021 is disposed inside the shell 5031, and a second interlayer sealing ring 6022 is formed between the inner liner 6021 and the shell 5031. The sealing ring 6022 is disposed at the upper end of the shell 5031 and the inner liner 6021. Two retaining rings 6023 are respectively connected to the sealing ring 6022. The upper end of the shell 5031 and the inner liner 6021 are respectively provided with retaining grooves. The two retaining rings 6023 respectively cooperate with the corresponding retaining grooves, so that the sealing ring 6022 can rotate. The first connecting pipe 6024 and the second connecting pipe 6025 are respectively connected between the inner wall of the sleeve 6011 and the sealing ring 6022, and the first connecting pipe 6024 and the second connecting pipe 6025 are respectively connected to the first interlayer and the second interlayer.

[0068] It should be noted that both the first nozzle 5034 and the second nozzle 5035 penetrate the second interlayer and communicate with the interior of the inner liner 6021. The first nozzle 5034 is welded and fixed to both the shell 5031 and the inner liner 6021, and the second nozzle 5035 is welded and fixed to both the shell 5031 and the inner liner 6021, ensuring the stability and sealing of the inner liner 6021. The inner liner 6021 is made of wear-resistant stainless steel with a corundum lining to ensure wear resistance.

[0069] The connections between the first connecting pipe 6024 and the sleeve 6011 and the sealing ring 6022, as well as the connections between the second connecting pipe 6025 and the sleeve 6011 and the sealing ring 6022, are all sealed to prevent cooling water leakage.

[0070] It is understandable that the sealing ring 6022 forms a rotational fit with the housing 5031 and the inner liner 6021, so that when the housing 5031 rotates, the sealing ring 6022, the first connecting pipe 6024, and the second connecting pipe 6025 remain stationary, thereby ensuring the sealed flow of cooling water.

[0071] Specifically, when the pipe body 501 and the nozzle assembly 503 are immersed in the molten iron layer for spraying, the cooling water supply system is activated so that the cooling water enters one of the arc-shaped channels of the first interlayer through the inlet pipe 6013. The cooling water flows vertically downward along the pipe body 501 to cool the pipe body 501. After entering the second interlayer through the first connecting pipe 6024 to fully cool the shell 5031, it flows back to the other arc-shaped channel of the first interlayer through the second connecting pipe 6025. Finally, it flows vertically upward along the pipe body 501 and is discharged through the outlet pipe 6014, forming a closed water cooling cycle to achieve synchronous and continuous cooling of the pipe body 501 and the nozzle assembly 503.

[0072] It is understandable that the above implementation method can increase the spray gun life to ≥25 times, thereby greatly reducing the risk of equipment burn-out, increasing the service life of the equipment, and reducing maintenance costs.

[0073] In one embodiment of this application, such as Figure 4 As shown, the anti-splash scraping mechanism 7 includes multiple limit blocks 701 and a protective cover 702.

[0074] Among them, multiple limiting blocks 701 are respectively set at the lower end of the outer wall of the tube body 501, and the protective cover 702 is slidably sleeved on the outside of the tube body 501, and the protective cover 702 is adapted to the furnace mouth of the converter 8.

[0075] It should be noted that the protective cover 702 described in this embodiment is made of wear-resistant stainless steel, ensuring good wear resistance and high temperature resistance.

[0076] Specifically, during the blowing operation, as the tube body 501 descends, the protective cover 702 descends synchronously until it is fastened to the edge of the converter 8, forming a closed blowing space. This effectively blocks the splashing of molten iron caused by agitation, avoiding material loss and equipment damage. After the blowing operation is completed, the lifting mechanism 4 drives the tube body 501 to rise. The protective cover 702 can scrape off the slag attached to the outer wall of the tube body 501. When the nozzle assembly 503 is completely removed from the molten iron, as it rotates, the slag on the surface of the shell 5031 will be automatically thrown off under the action of centrifugal force. After hitting the protective cover 702, it will fall back into the converter 8.

[0077] As the tube body 501 continues to rise, the limit block 701 will drive the protective cover 702 to move upward and away from the furnace opening. Then, through the linear module 2 and the gantry 3, the blowing mechanism 5 will move horizontally as a whole, which will facilitate the subsequent operation of the converter 8.

[0078] In summary, the dephosphorization blowing device for stainless steel molten iron pretreatment of this application, by setting multiple circumferential first nozzles on the shell, allows the carrier gas and dephosphorizing agent to be premixed after entering the shell through the pipe body, so that the dephosphorizing agent is evenly dispersed. Then, the airflow is sprayed out through the first nozzles along the tangential direction of the shell, forming a horizontal swirling field, thereby driving the nozzle assembly to rotate automatically in the molten iron. At the same time, multiple second nozzles spray multiple airflows upward and downward at a 45° angle, which not only allows the dephosphorizing agent to be evenly diffused into the molten iron, eliminating dead zones, but also enhances the stirring effect of the molten iron, and the dephosphorizing agent to have more sufficient contact with the molten iron, significantly improving the dephosphorization reaction rate and dephosphorization effect.

[0079] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0080] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0081] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A dephosphorization blowing device for pretreatment of molten stainless steel, characterized in that, include: The system comprises a base (1), a linear module (2), a gantry frame (3), a lifting mechanism (4), a spraying mechanism (5), a cooling mechanism (6), and a splash-proof scraping mechanism (7), among which... A converter (8) is provided on the base (1); The linear module (2) is installed on the upper part of the base (1), and the base (1) is located between the linear modules (2); The gantry (3) is mounted on the linear module (2); The lifting mechanism (4) is mounted on the gantry frame (3); The spraying mechanism (5) includes a pipe body (501), a conveying assembly (502), and a nozzle assembly (503), wherein, The tube body (501) is connected to the lifting mechanism (4), and the tube body (501) corresponds to the furnace opening of the converter (8); The conveying assembly (502) is connected to the upper end of the tube (501); The nozzle assembly (503) is rotatably connected to the lower end of the tube body (501). Part of the carrier gas and dephosphorizing agent can be sprayed out along its tangential direction through the nozzle assembly (503) to form a horizontal swirling field, which drives the nozzle assembly (503) to rotate automatically. The cooling mechanism (6) includes a first cooling component (601) and a second cooling component (602), wherein, The first cooling assembly (601) is disposed inside the tube body (501); The second cooling component (602) is disposed inside the nozzle assembly (503), and the second cooling component (602) is connected to the first cooling component (601); The anti-splash scraping mechanism (7) is located outside the pipe body (501).

2. The dephosphorization blowing device for stainless steel molten iron pretreatment according to claim 1, characterized in that, The lifting mechanism (4) includes two driving components (401) and a support plate (402), wherein, The two drive units (401) are respectively mounted on the gantry (3), and the output end passes through the gantry (3). The support plate (402) is connected to the output ends of the two drive components (401), and the tube (501) is disposed through the middle of the support plate (402).

3. The dephosphorization blowing device for stainless steel molten iron pretreatment according to claim 1, characterized in that, The conveying assembly (502) includes an air inlet pipe (5021) and a feed pipe (5022), wherein, The intake pipe (5021) is connected to and communicates with the upper end of the pipe body (501); The feed pipe (5022) is connected to and communicates with the air inlet pipe (5021).

4. The dephosphorization blowing device for stainless steel molten iron pretreatment according to claim 1, characterized in that, The nozzle assembly (503) includes a housing (5031), a rotating block (5032), a seal (5033), a plurality of first nozzles (5034), and a plurality of second nozzles (5035), wherein, A rotating groove is provided at the lower end of the inner wall of the tube body (501); The inlet end of the housing (5031) is inserted into the lower end of the tube (501); The rotating block (5032) is disposed on the outer wall of the inlet end of the housing (5031), and the rotating block (5032) is adapted to the rotating groove; The sealing element (5033) is disposed on the rotating block (5032); A plurality of first nozzles (5034) and a plurality of second nozzles (5035) are respectively disposed on the housing (5031).

5. The dephosphorization blowing device for stainless steel molten iron pretreatment according to claim 4, characterized in that, The housing (5031) has a capsule-shaped structure. A plurality of first nozzles (5034) are arranged in a circumferential array on the annular surface of the housing (5031). A plurality of second nozzles (5035) are arranged in a circumferential array on two spherical surfaces of the housing (5031), and the included angle between the second nozzles (5035) and the first nozzles (5034) is 45°.

6. The dephosphorization blowing device for stainless steel molten iron pretreatment according to claim 1, characterized in that, The first cooling assembly (601) includes a sleeve (6011), two baffles (6012), an inlet pipe (6013), and an outlet pipe (6014), wherein, The sleeve (6011) is disposed inside the tube body (501), and a first interlayer is formed between the sleeve (6011) and the tube body (501); The two partitions (6012) are respectively disposed inside the first interlayer and connected to the sleeve (6011) and the tube (501). The two partitions (6012) are arranged in parallel and symmetrically, and the upper end of the partition (6012) is connected to the upper wall of the tube (501), while the lower end of the partition (6012) is not connected to the lower wall of the tube (501). The inlet pipe (6013) and the outlet pipe (6014) are respectively disposed on the upper end of the outer wall of the pipe body (501), and the inlet pipe (6013) and the outlet pipe (6014) are symmetrically arranged about the partition (6012).

7. A dephosphorization blowing device for stainless steel molten iron pretreatment according to claim 6 or 4, characterized in that, The second cooling assembly (602) includes an inner liner (6021), a sealing ring (6022), two retaining rings (6023), a first connecting pipe (6024), and a second connecting pipe (6025), wherein, The inner liner (6021) is disposed inside the shell (5031), and a second interlayer is formed between the inner liner (6021) and the shell (5031); The sealing ring (6022) is disposed at the upper end of the shell (5031) and the inner liner (6021); The two retaining rings (6023) are respectively connected to the sealing ring (6022). The upper ends of the shell (5031) and the inner liner (6021) are respectively provided with retaining grooves. The two retaining rings (6023) respectively cooperate with the corresponding retaining grooves, so that the sealing ring (6022) can rotate. The first connecting pipe (6024) and the second connecting pipe (6025) are respectively connected between the inner wall of the sleeve (6011) and the sealing ring (6022), and the first connecting pipe (6024) and the second connecting pipe (6025) are respectively connected to the first interlayer and the second interlayer.

8. The dephosphorization blowing device for stainless steel molten iron pretreatment according to claim 1, characterized in that, The anti-splash scraping mechanism (7) includes multiple limiting blocks (701) and a protective cover (702), wherein, Multiple limiting blocks (701) are respectively disposed at the lower end of the outer wall of the tube body (501); The protective cover (702) is slidably sleeved on the outside of the tube body (501), and the protective cover (702) is adapted to the furnace opening of the converter (8).

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