Rapid slag forming equipment and method for restraining slag from being dried back through low molten iron of converter
The converter low-iron ratio slag drying suppression device, which uses an air-push inclined oxygen pipe and cam linkage structure, solves the problems of slag drying and poor melting under low iron ratio, and improves the slag-steel mixing effect and extends the equipment life.
Patent Information
- Application Number
- CN202511166684.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-20
- Publication Date
- 2025-11-11
AI Technical Summary
Under low iron-to-metal ratio conditions, the problems of slag drying and poor melting during converter smelting affect the slag formation and dephosphorization effects. Conventional slag materials are used in large quantities and are difficult to melt, and materials such as fluorite have a corrosive effect on the furnace body refractory materials.
A rapid slag-forming device for inhibiting slag drying in low-melting-point converter molten iron was designed. It adopts an air-driven inclined oxygen pipe that is tilted around the periphery of the oxygen blowing pipe and driven to rotate by the reaction force of the oxygen jet. Combined with the linkage structure of cam and wall plate, it automatically dispenses composite slag-forming agent and low-melting-point slag to quickly disperse the slag and reduce its melting point.
It effectively inhibits slag drying, enhances slag-steel mixing, reduces temperature loss, extends equipment life, reduces erosion of furnace refractory materials, and ensures stable dephosphorization reaction.
Smart Images
Figure CN120924751A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of converter steelmaking technology, specifically to a rapid slag-forming device and method for inhibiting slag re-drying in low-temperature molten iron converters. Background Technology
[0002] In converter steelmaking, with the increase of scrap steel ratio, low-iron smelting (such as scrap steel ratio ≥35%) has become the mainstream trend in the industry. However, when producing under the condition of low iron ratio, the temperature of the converter smelting process is low, and the added lime, magnesium balls and other slag materials have poor melting effect in the furnace. There is a situation where the slag material does not melt in the early stage, which will affect slag formation and dephosphorization. In addition, during the converter smelting process, the addition of slag materials such as sintered ore after slag drying has the problem of large temperature loss, which will also affect dephosphorization. Conventional converter slag materials include lime, limestone, magnesium balls, (raw) dolomite, magnesite, fluorite and other materials. Fluorite has the function of slag formation in the furnace, but fluorite has a high fluorine content, which has a very serious corrosive effect on the magnesia refractory materials of the converter, affecting the service life of the converter.
[0003] To address this, a rapid slag-forming device and method for suppressing slag re-drying in converters with low-temperature molten iron are proposed. Summary of the Invention
[0004] The purpose of this invention is to provide a rapid slag-forming device and method for inhibiting slag re-drying in converters with low molten iron ratios, in order to solve the problems mentioned in the background art, such as the large amount of conventional converter slag-forming materials required and the difficulty in melting them in the furnace under low molten iron ratios, which affect converter slag-forming and dephosphorization.
[0005] To achieve the above objectives, the present invention provides the following technical solution: a rapid slag-forming device for inhibiting slag re-drying in low-iron-water converters, comprising: Converter furnace body; The water-cooled furnace cover is fitted in a shape to fit the furnace opening of the converter body, forming a sealed high-temperature reaction space with the converter body; The water-cooled furnace cover includes a coil cover body. The top of the coil cover body has a flat feeding cover plate. Multiple feeding ports are integrally formed on the surface of the feeding cover plate at its center and around its periphery. Inside the feeding cover plate, a cross-shaped movable valve channel extends from the central feeding port to one of the peripheral feeding ports. The movable valve channel is internally constrained by a spring elastically connected to a spring valve rod, which reciprocates. The feeding port at the center is in clearance fit with an oxygen blowing pipe. After the oxygen blowing pipe is inserted into the feeding port, the surface of the feeding port remains in contact with the spring. The end of the spring valve stem makes rolling contact. The lower wheel surface of the cam is rigidly connected to multiple wall plates that rotate and move along the wall of the oxygen blowing pipe. The lower end of each of these wall plates is integrally equipped with a heat exchange plate, and the heat exchange plate is fixed to the upper pipe surface of the oxygen blowing pipe in a way that fits the path of the oxygen blowing pipe. The upper end of the oxygen blowing pipe is integrally connected to a rotating ring that is rotatably limited on a positioning seat. The inside of the oxygen blowing pipe is connected to an annular maintenance channel that is open inside the rotating ring. The oxygen passage of the oxygen blowing pipe has multiple one-way air holes that pass through the positioning seat to the maintenance channel. Each one-way air hole is equipped with a pressure relief valve that opens to the maintenance channel.
[0006] Preferably, the surface of the coil cover is integrally welded with an arc-shaped exhaust pipe, which is through the inside of the exhaust pipe and has a flange at the end of the exhaust pipe that connects to the external flue. The surface of the coil cover and the exhaust pipe is evenly arranged with water-cooling pipes along the path, and the pipes have water-cooling circulation interfaces. The surface of the coil cover is welded with multiple lifting lugs in a circular array along the axis without affecting the exhaust pipe and the water-cooling pipes, for assembly with hoisting equipment.
[0007] Preferably, during reciprocating movement, the two ends of the spring valve rod protrude sequentially from the interior of the central feeding port and the peripheral feeding port. When the spring valve rod protrudes from the interior of the peripheral feeding port, the discharge valve hole through which it is installed on the rod body communicates with the pipe hole inside the peripheral feeding port, thereby cooperating with the feeding port to release the second batch of composite slag-forming agent into the converter furnace body.
[0008] Preferably, at least one of the feed ports on the periphery is connected to the feeding end of the first batch of composite slag-forming agent through a pipeline, and the radius of the feed port connected to the movable valve channel is smaller than the radius of the spring valve stem.
[0009] Preferably, the radius of the upper part of the oxygen blowing pipe is larger than that of the main body part inserted into the converter furnace body, and the upper part of the oxygen blowing pipe has a connecting frame for connecting to external reciprocating traction equipment.
[0010] Preferably, the oxygen blowing pipe has oxygen blowing holes running vertically through the core position inside, and the oxygen blowing pipe has annular cooling water channels arranged around the holes inside, and the upper part of the oxygen blowing pipe has interfaces for cooling water input and oxygen input respectively on the side or end face.
[0011] Preferably, the sealing plate fitted on the surface of the oxygen blowing pipe seals the port of the feeding port, and the cam, which is rotated and limited on the oxygen blowing pipe rod, is located inside the feeding port.
[0012] Preferably, the positioning rotary seat is interference-fitted at a predetermined position in the slag-forming area of the converter body corresponding to the oxygen blowing pipe body.
[0013] Preferably, the oxygen blowing tubes are all inclined at the same angle around the periphery of the oxygen blowing tube, and their lower ends are inserted into the molten iron.
[0014] A rapid slag-forming method for inhibiting slag re-drying in low-iron-temperature converters, the specific steps of which are as follows: S1. After the pre-process is completed, the molten iron enters the converter body, the tilting mechanism makes it vertical, the coil cover is closed to form a closed space, the temperature is reduced by circulating cooling water, the flue gas is output through the exhaust pipe, and the lifting lugs ensure the stability of the assembly. S2. The oxygen blowing pipe is lowered and inserted into the raw material, the sealing plate enhances the airtightness, the cooling water channel cools down, and the oxygen supply equipment blows oxygen through the oxygen blowing pipe to promote the oxidation reaction of the raw material to produce molten steel; S3. For smelting with low iron-to-water ratio, the first batch of composite slag-forming agent is added at a rate of 1.5-2.0 kg per ton of steel through the corresponding feed port on the perimeter within 3 minutes of the initial blowing stage. The conventional slag material is added at 2 / 3 of the amount through another corresponding feed port to solve the problem of slag not dissolving in the early stage. S4. When the slag is dried during the blowing process, the oxygen pressure rises, triggering the opening of the pressure relief valve in the one-way air hole on the positioning rotary seat. Oxygen enters the annular maintenance channel inside the rotating ring, driving the L-shaped air-push inclined oxygen pipe to rotate, breaking up the slag and supplying oxygen to the deeper layers. At the same time, the L-shaped air-push inclined oxygen pipe drives the cam to rotate through the wall plate, pushing the spring valve rod in the moving valve channel, so that the second batch of slag-forming agent enters the furnace through the corresponding feeding port through the feeding valve hole. After mixing, it reduces the melting point and basicity of the slag, quickly solving the problem of drying. S5. After steelmaking is completed, remove the slag and molten steel according to the specifications.
[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention, by setting an inclined oxygen tube that is tilted around the oxygen blowing pipe and using the reaction force of the oxygen jet to drive its rotation around the oxygen blowing pipe, can quickly break up agglomerated slag when the slag is dried, enhance the slag-steel mixing effect in the converter furnace, and avoid poor melting caused by slag agglomeration. At the same time, the inclined oxygen tube continuously supplies oxygen to the deep layer of molten steel during rotation, which can supplement the oxygen required for the reaction, reduce the temperature loss caused by the slag drying, and ensure the stable progress of the dephosphorization reaction. Furthermore, through the connection between the heat exchange plate and the oxygen blowing pipe cooling system, effective cooling of high-temperature pipe components is achieved, extending the service life of the equipment.
[0016] 2. This invention utilizes a linkage structure where a cam is rigidly connected to the wall plate and a spring valve rod rolls in contact with the cam. The rotation of the air-push inclined oxygen pipe drives the cam to rotate, which in turn pushes the spring valve rod to reciprocate within the moving valve channel, controlling the opening and closing of the feeding valve orifice and the feeding port. This automatically triggers the addition of a second batch of composite slag-forming agent when oxygen pressure rises due to slag drying. The response is timely and requires no additional power source. Combined with a low-melting-point composite slag-forming agent, it can quickly fall into the converter furnace body through the feeding port and mix with the slag under the agitation of the rotating air-push inclined oxygen pipe, reducing the slag melting point and viscosity, effectively inhibiting slag drying, and simultaneously reducing erosion of the converter furnace body's magnesia refractory material, thus extending the converter's service life. Attached Figure Description
[0017] Figure 1 This is an overall structural view of the present invention; Figure 2 This is the overall cross-section of the present invention. Figure 1 ; Figure 3 This is the overall cross-section of the present invention. Figure 2 ; Figure 4 This is a schematic diagram of the main body of the oxygen blowing pipe and its connection structure according to the present invention; Figure 5 This is a schematic diagram of the main body of the oxygen blowing tube of the present invention; Figure 6 This is a schematic diagram of the external structure of the oxygen blowing pipe body of the present invention; Figure 7 This is a cross-sectional view of the coil cover body of the present invention along the movable valve passage; Figure 8 For the present invention Figure 2 Enlarged view of point A in the middle.
[0018] In the picture: 1. Converter furnace body; 2. Water-cooled furnace cover; 21. Coil cover; 211. Lifting lug; 22. Exhaust pipe; 23. Feeding cover plate; 231. Feeding port; 232. Moving valve channel; 233. Spring valve stem; 234. Discharge valve hole; 24. Oxygen blowing pipe; 241. Connecting frame; 242. Sealing plate; 243. Positioning rotary seat; 244. One-way air hole; 245. Rotary ring; 246. Maintenance channel; 247. Air-driven inclined oxygen pipe; 2471. Heat exchange plate; 248. Attached wall plate; 249. Cam. Detailed Implementation
[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0020] Please see Figures 1 to 8 This invention provides a technical solution for a rapid slag-forming device and method for inhibiting slag re-drying in low-temperature molten iron converters: A rapid slag-forming device for inhibiting slag re-drying in low-iron-temperature converters includes: The converter body 1 is the core carrier of the steelmaking reaction. Its structure mainly includes an outer steel furnace shell (which provides support and protection), an inner refractory lining made of refractory materials (such as magnesia-carbon bricks, etc.) (which is heat-resistant to form a reaction space), a furnace opening at the top (for charging, flue gas exhaust and steel tapping), and trunnions on both sides of the furnace body (connecting to a tilting mechanism to tilt the furnace body to complete operations such as steel tapping and slag tapping). The water-cooled furnace cover 2 is fitted in a matching shape at the furnace opening of the converter body 1, forming a sealed high-temperature reaction space with the converter body 1. The water-cooled furnace cover 2 includes a coil cover body 21. An arc-shaped exhaust pipe 22 is integrally welded to the surface of the coil cover body 21. The exhaust pipe 22 is internally continuous and has a flange at its end that connects to the external flue. Water-cooling pipes are evenly distributed around the surface of the coil cover body 21 and the exhaust pipe 22. The pipes have water-cooling circulation interfaces. Multiple lifting lugs 211 are welded to the surface of the coil cover body 21 in a circular array along the axis without affecting the exhaust pipe 22 and the water-cooling pipes. The top of the coil cover body 21 has a flat feeding cover plate 23. Multiple feeding ports 231 are integrally provided on the surface of the feeding cover plate 23 at the center and around the center. The feed inlet 231 located in the center is fitted with the oxygen blowing pipe 24 with a clearance. The radius of the upper part of the oxygen blowing pipe 24 is larger than the main part inserted into the converter body 1. The upper part of the oxygen blowing pipe 24 has a connecting frame 241 for connecting to the external reciprocating traction equipment. The oxygen blowing pipe 24 has oxygen blowing holes running vertically through the shaft core. The oxygen blowing pipe 24 has an annular cooling water channel around the holes. The upper part of the oxygen blowing pipe 24 has cooling water input and output interfaces and oxygen input interfaces respectively on the side or end face. After the oxygen blowing pipe 24 is inserted into the feed inlet 231, the sealing plate 242 on the surface of the oxygen blowing pipe 24 seals the port of the feed inlet 231. Multiple wall plates 248 are equidistantly arranged around the main body of the oxygen blowing pipe 24. Each of these wall plates 248 has a heat exchange plate 2471 integrally mounted at its lower end. The heat exchange plate 2471 is fixed to the upper surface of the air-push inclined oxygen pipe 247 along its path. The air-push inclined oxygen pipe 247 is an L-shaped, high-strength pipe body, and a circulating water channel communicating with the internal water channel of the oxygen blowing pipe 24 can be installed inside the pipe as needed. The upper end of each air-push inclined oxygen pipe 247 is integrally connected to a rotating ring 245 that is rotatably limited on a positioning pivot 243. The oxygen blowing pipes 247 are connected to the annular maintenance channel 246 openly set inside the rotating ring 245. The positioning rotary seat 243 is interference-fitted at the predetermined position of the oxygen blowing pipe 24 corresponding to the slag forming area of the converter body 1. The oxygen passage of the oxygen blowing pipe 24 passes through the positioning rotary seat 243 and has multiple one-way air holes 244 through the maintenance channel 246. The one-way air holes 244 are equipped with pressure relief valves that open to the maintenance channel 246. The oxygen blowing pipes 247 are all inclined at the same angle around the oxygen blowing pipe 24, and the lower end is inserted into the molten iron.
[0021] During operation, the preliminary process is completed first. After the molten iron enters the converter body 1, the tilting mechanism makes it vertical. The hoisting equipment covers the furnace opening with the coil cover 21 to form a sealed space. Cooling water is circulated through the surface pipes to cool the cover and exhaust pipe 22. The flue gas is discharged and treated through the exhaust pipe 22. The lifting lug 211 ensures the stability of the assembly. Subsequently, the reciprocating drive equipment pushes the oxygen blowing pipe 24 down along the central feeding port 231 to the designated depth of the raw material. The sealing plate 242 enhances the seal. The cooling water channel inside the oxygen blowing pipe 24 circulates and cools the iron. External oxygen is supplied to the molten iron through the shaft core air hole to promote the reaction of the raw material to produce molten steel. For low iron ratio, a specific composite slag-forming agent (Al2O3 30-40%, CaO 35-45%, etc., melting point <130) is used. At 0℃, the first batch (1.5-2.0 kg per ton of steel) is added 3 minutes before blowing through the peripheral feeding port 231. The amount of conventional slag is added at 2 / 3 of the amount to solve the problem of slag not melting in the early stage. If the slag becomes dry during blowing (FeO consumption causes the slag melting point to rise), the oxygen pressure in the oxygen blowing pipe 24 increases and opens the pressure relief valve of the one-way air hole 244. Oxygen enters the inclined air through the maintenance channel 246 and pushes the inclined oxygen pipe 247. The reaction force of the air jet pushes it to rotate around the oxygen blowing pipe 24 to break up the clump of slag. At the same time, the attached plate 248 drives the cam 249 to rotate, which pushes the spring valve rod 233 to move and connect the discharge valve hole 234. The second batch of slag-forming agent (0.5-1.0 kg per ton of steel) falls in through the feeding port 231 to reduce the slag melting point and solve the problem of dryness.
[0022] In summary, by setting the inclined oxygen pipe 247 to be tilted around the oxygen blowing pipe 24 and using the reaction force of the oxygen jet to drive its rotation around the oxygen blowing pipe 24, the structure can quickly break up the clumps of slag when the slag is dried, enhance the slag-steel mixing effect in the converter body 1, and avoid the problem of poor melting caused by slag agglomeration. At the same time, the inclined oxygen pipe 247 continuously supplies oxygen to the deep layer of molten steel during rotation, which can supplement the oxygen required for the reaction, reduce the temperature loss caused by the slag drying, and ensure the stable progress of the dephosphorization reaction. Furthermore, the connection between the heat exchange plate 2471 and the cooling system of the oxygen blowing pipe 24 achieves effective cooling of high-temperature pipe components and extends the service life of the equipment.
[0023] As one embodiment of the present invention, such as Figure 3 and Figure 7As shown, each of the feeding ports 231 has a closable through hole at its axial position to facilitate feeding, monitoring, and maintenance. Inside the feeding cover plate 23, a cross-shaped movable valve channel 232 extends from the central feeding port 231 to one of the peripheral feeding ports 231. The movable valve channel 232 continues axially from its through end inside the peripheral feeding port 231. Inside the movable valve channel 232, a spring elastically connected to the spring valve stem 233 reciprocates, constraining the spring valve stem 233. During reciprocating movement, the spring valve stem 233... Both ends protrude sequentially from the interior of the central feeding port 231 and the peripheral feeding port 231. When the spring valve rod 233 protrudes from the interior of the peripheral feeding port 231, the discharge valve hole 234 through which it is set on the rod body is connected to the pipe hole inside the peripheral feeding port 231, so as to cooperate with the feeding port 231 to feed the second batch of composite slagging agent into the converter furnace body 1. At least one of the peripheral feeding ports 231 is connected to the feeding end of the first batch of composite slagging agent through a pipeline. The radius of the channel of the feeding port 231 connected to the moving valve channel 232 is smaller than the radius of the spring valve rod 233. The cam 249, which is rotatably limited on the oxygen blowing pipe 24 rod, is located inside the feeding port 231. Under the action of the spring, the wheel surface of the feeding port 231 is always in rolling contact with the rod end of the spring valve rod 233. The lower wheel surface of the cam 249 is rigidly connected to a plurality of wall plates 248 that rotate and move along the pipe wall of the oxygen blowing pipe 24.
[0024] During operation, the inclined oxygen tube 247 is connected to the attached wall plate 248 via the lower heat exchange plate 2471. The attached wall plate 248 rotates synchronously with the oxygen tube 24, transferring the high temperature of the inclined oxygen tube 247 to the cooling system of the oxygen tube 24 for cooling. At the same time, it drives the cam 249 to rotate. The cam 249 pushes the spring valve rod 233 in the moving valve channel 232 to move with its surface undulation. When the spring valve rod 233 protrudes out of the corresponding feeding port 231, the feeding valve hole 234 is connected to the feeding port 231, and the second batch of slag-forming agent (0.5-1.0 kg per ton of steel) falls into the furnace. It is mixed under the stirring of the inclined oxygen tube 247, reducing the slag melting point and basicity to achieve descaling.
[0025] In summary, by setting up a linkage structure in which the cam 249 is rigidly connected to the wall plate 248 and the spring valve rod 233 rolls in contact with the cam 249, the rotation of the air-push inclined oxygen pipe 247 drives the cam 249 to rotate, thereby pushing the spring valve rod 233 to reciprocate within the moving valve channel 232 to achieve the on / off control of the feeding valve hole 234 and the feeding port 231. This can automatically trigger the addition of the second batch of composite slag-forming agent when the oxygen pressure rises due to the slag drying out. The response is timely and no additional power source is required. With the low-melting-point composite slag-forming agent, it can quickly fall into the converter body 1 through the feeding port 231 and mix with the slag under the stirring of the rotating air-push inclined oxygen pipe 247, reducing the melting point and viscosity of the slag, effectively inhibiting the slag drying out, and reducing the erosion of the magnesium refractory material of the converter body 1, thus extending the service life of the converter.
[0026] Working principle: During operation, the pre-process steps of converter steelmaking must be completed first. After the molten iron is poured into the converter body 1, the tilting mechanism will drive the converter body 1 to rotate to an upward vertical position. Then, under the control of the hoisting equipment, the coil cover 21 will slowly fall to the upper end of the converter body 1 to seal its upper end and form a closed reaction space. At this time, cooling water will be circulated in the pipes that are arranged around the surface of the coil cover 21 to continuously cool the coil cover 21 and the curved exhaust pipe 22 to prevent structural deformation caused by high temperature. The flue gas generated during the steelmaking process is connected to the external flue through the flange at the end of the exhaust pipe 22 and output to the designated treatment equipment for treatment. The lifting lug 211 works with the hoisting equipment to ensure the stable assembly of the furnace cover. Next, under the push of the reciprocating drive equipment, the oxygen blowing pipe 24 will move down along the hole wall of the feeding port 231 at the center position until it is inserted into the designated depth area of the steelmaking raw material inside the converter body 1. At this time, the sealing plate 242 sleeved on the surface of the oxygen blowing pipe 24 will seal the port of the feeding port 231 to enhance the airtightness. The annular cooling water channel set around the air hole inside will circulate cooling water through the upper interface to cool and protect the main body of the oxygen blowing pipe 24. The external oxygen supply equipment blows oxygen into the steelmaking raw material through the air hole of the oxygen blowing pipe 24 shaft. The oxygen forms a reaction space in the molten iron and comes into contact with the raw material, causing the raw material to undergo a violent oxidation reaction to generate molten steel. To address the slag formation requirements in low-iron-ratio smelting, a composite slag-forming agent with specific components (30-40% Al2O3, 35-45% CaO, 12-18% FeO, ≤3% SiO2, ≤1% H2O) is required. This agent has a melting point below 1300℃ and low basicity, which reduces erosion of the furnace lining refractory. In the first 3 minutes of converter blowing, the first batch of composite slag-forming agent is added to the furnace through the corresponding feed port 231 on the periphery at a rate of 1.5-2.0 kg per ton of steel. Other conventional slag materials are added through another corresponding feed port 231 at a ratio of 2 / 3 of the amount used without the composite slag-forming agent. This addresses the problem of slag not melting in the early stages under low-iron-ratio conditions. As the blowing process continues, if the slag in the furnace becomes dry (due to the excessive consumption of oxidizing components such as FeO by the carbon-oxygen reaction, resulting in an increase in the melting point and viscosity of the slag, causing it to float to the surface of the molten steel), the oxygen pressure in the oxygen blowing pipe 24 will gradually increase. When the pressure reaches the threshold, it will force the pressure relief valve installed in the one-way air hole 244 on the positioning rotary seat 243 to open. The oxygen will then enter the annular maintenance channel 246 in the rotating ring 245 and be distributed to each L-shaped inclined oxygen blowing pipe 247 along the maintenance channel 246. Since the inclined oxygen blowing pipe 247 is set at the same angle and the rotation of the rotating ring 245 is limited to the positioning rotary seat 243, the oxygen will generate a reaction force when it is sprayed from the lower end of the inclined oxygen blowing pipe 247, pushing the inclined oxygen blowing pipe 247 to rotate along the oxygen blowing pipe 24 through the rotating ring 245. During the rotation, the dry and agglomerated slag will be broken up, and oxygen will be continuously supplied to the deep layer of the molten steel to promote the smelting reaction. During this process, the air-push inclined oxygen tube 247 is connected to the attached wall plate 248 via the integrated heat exchange plate 2471 at its lower end. The attached wall plate 248 rotates synchronously along the tube wall of the oxygen tube 24, which not only transfers the high temperature absorbed by the air-push inclined oxygen tube to the cooling system of the oxygen tube 24 (the circulating water circuit inside the air-push inclined oxygen tube 247 is connected to the cooling water channel of the oxygen tube 24) through heat exchange, thus achieving cooling protection; it also drives the cam 249, which is rotated and limited on the rod of the oxygen tube 24, to rotate synchronously. The rotating cam 249 uses the surface undulation path to continuously push the spring valve rod 233 in the moving valve channel 232 to move under the action of the spring. When the spring valve rod 233 protrudes from the periphery When the second batch of composite slag-forming agent is connected to the inside of the feeding port 231, the discharge valve hole 234 on its rod will be connected to the pipe hole of the feeding port 231 (when the cam 249 rotates, the spring cannot be reset in time, and the discharge valve hole 234 will remain connected to the feeding port 231). This allows the second batch of composite slag-forming agent stored in the pipeline (added at 0.5-1.0 kg per ton of steel) to fall into the furnace through the discharge valve hole 234. Under the stirring of the rotating air-push inclined oxygen pipe 247, these slag-forming agents are fully mixed with the molten steel and the dispersed slag, reducing the melting point and basicity of the slag and quickly solving the problem of dryness. After steelmaking is completed, the slag and molten steel can be removed according to the standard operation.
[0027] A rapid slag-forming method for inhibiting slag re-drying in low-iron-temperature converters, the specific steps of which are as follows: S1. After the pre-process is completed, the molten iron enters the converter body 1, the tilting mechanism makes it vertical, the coil cover 21 is closed to form a closed space, the temperature is reduced by circulating cooling water, the flue gas is output through the exhaust pipe 22, and the lifting lug 211 ensures the stability of the assembly. S2. The oxygen blowing pipe 24 is lowered and inserted into the raw material, the sealing plate 242 enhances the airtightness, the cooling water channel cools down, and the oxygen supply equipment blows oxygen through the oxygen blowing pipe 24 to promote the oxidation reaction of the raw material to generate molten steel; S3. For smelting with low iron-to-water ratio, add the first batch of composite slag-forming agent (containing 30-40% Al2O3, 35-45% CaO, etc., melting point <1300℃) at a rate of 1.5-2.0 kg per ton of steel through the corresponding feed port 231 on the periphery within the first 3 minutes of blowing. Add 2 / 3 of the conventional slag material through another corresponding feed port 231 to solve the problem of slag not dissolving in the early stage. S4. When the slag material is dried during the blowing process, the oxygen pressure rises, triggering the opening of the pressure relief valve in the one-way air hole 244 on the positioning rotary seat 243. Oxygen enters the annular maintenance channel 246 inside the rotating ring 245, driving the L-shaped air-push inclined oxygen pipe 247 to rotate, breaking up the slag material and supplying oxygen to the deeper layers. At the same time, the air-push inclined oxygen pipe 247 drives the cam 249 to rotate through the wall plate 248, pushing the spring valve rod 233 in the moving valve channel 232, so that the second batch of slag-forming agent (0.5-1.0 kg per ton of steel) enters the furnace through the feeding valve hole 234 from the corresponding feeding port 231. After mixing, it lowers the melting point and basicity of the slag, quickly solving the problem of drying. S5. After steelmaking is completed, remove the slag and molten steel according to the specifications.
[0028] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A rapid slag-forming device for inhibiting slag re-drying in low-iron-temperature converters, comprising: Converter furnace body (1); The water-cooled furnace cover (2) is fitted in a matching shape at the furnace opening of the converter furnace body (1) to form a sealed high-temperature reaction space with the converter furnace body (1); Its features are: The water-cooled furnace cover (2) includes a coil cover body (21). The top of the coil cover body (21) has a flat feeding cover plate (23). The surface of the feeding cover plate (23) is integrally provided with multiple feeding ports (231) at the center and around the center. A cross-shaped moving valve channel (232) runs through the feeding port (231) at the center and around the center of the feeding cover plate (23). The moving valve channel (232) is fitted with a spring that is elastically connected to the spring valve rod (233) and reciprocates to constrain the spring valve rod (233). The feeding port (231) at the center is fitted with an oxygen blowing pipe (24) with a clearance. After the oxygen blowing pipe (24) is inserted into the feeding port (231), the wheel surface of the feeding port (231) always rolls with the end of the spring valve rod (233). The lower wheel surface of the cam (249) is rigidly connected to a plurality of wall plates (248) that rotate and move along the wall of the oxygen blowing pipe (24). The lower ends of these wall plates (248) are integrally equipped with a heat exchange plate (2471), and the heat exchange plate (2471) is fixed to the upper pipe surface of the air-push inclined oxygen pipe (247) in a shape that matches the path of the air-push inclined oxygen pipe (247). The upper ends of the air-push inclined oxygen pipe (247) are all in contact with the rotating... The rotating ring (245) on the positioning rotating seat (243) is integrally connected, and the inside of the air-push inclined oxygen pipe (247) is connected to the annular maintenance channel (246) openly set inside the rotating ring (245). The oxygen passage of the oxygen blowing pipe (24) is connected to the maintenance channel (246) through the positioning rotating seat (243) and has multiple one-way air holes (244). The one-way air holes (244) are equipped with pressure relief valves that open to the maintenance channel (246).
2. The rapid slag-forming equipment for inhibiting slag re-drying in converters with low-iron molten iron according to claim 1, characterized in that: The surface of the coil cover (21) is integrally welded with an arc-shaped exhaust pipe (22), and the exhaust pipe (22) is through the inside. The end of the exhaust pipe (22) is equipped with a flange for connecting to the external flue. The surface of the coil cover (21) and the exhaust pipe (22) is evenly arranged with water-cooling pipelines along the path, and the pipelines are equipped with water-cooling circulation interfaces. The surface of the coil cover (21) is welded with multiple lifting lugs (211) in a ring array along the axis without affecting the exhaust pipe (22) and the water-cooling pipelines. These lugs are used for assembly with hoisting equipment.
3. The rapid slag-forming device for inhibiting slag re-drying in converters with low-iron molten iron according to claim 1, characterized in that: During reciprocating movement, the two ends of the spring valve rod (233) protrude sequentially from the interior of the central feeding port (231) and the peripheral feeding port (231). When the spring valve rod (233) protrudes from the interior of the peripheral feeding port (231), the discharge valve hole (234) provided through the rod body is connected to the pipe hole inside the peripheral feeding port (231), thereby cooperating with the feeding port (231) to release the second batch of composite slag-forming agent into the converter furnace body (1).
4. The rapid slag-forming equipment for inhibiting slag re-drying in converters with low-iron molten iron according to claim 1, characterized in that: At least one of the feed ports (231) on the periphery is connected to the feed end of the first batch of composite slag-forming agent through a pipeline, and the radius of the feed port (231) connected to the moving valve channel (232) is smaller than the radius of the spring valve stem (233).
5. The rapid slag-forming equipment for inhibiting slag re-drying in converters with low-iron molten iron according to claim 1, characterized in that: The radius of the upper part of the oxygen blowing pipe (24) is larger than the main part inserted into the converter body (1), and the upper part of the oxygen blowing pipe (24) has a connecting frame (241) for connecting with external reciprocating traction equipment.
6. The rapid slag-forming device for inhibiting slag re-drying in converters with low-iron molten iron according to claim 1, characterized in that: The oxygen blowing pipe (24) has oxygen blowing holes running vertically through the shaft core. The oxygen blowing pipe (24) also has an annular cooling water channel surrounding the holes. Furthermore, the upper part of the oxygen blowing pipe (24) has interfaces for cooling water input and input, as well as interfaces for oxygen input, respectively.
7. The rapid slag-forming device for inhibiting slag re-drying in converters with low-iron molten iron according to claim 1, characterized in that: The sealing plate (242) fitted on the surface of the oxygen blowing pipe (24) seals the port of the feeding port (231), and the cam (249) that is rotated and limited on the rod of the oxygen blowing pipe (24) is located inside the feeding port (231).
8. The rapid slag-forming device for inhibiting slag re-drying in converters with low-iron molten iron according to claim 1, characterized in that: The positioning rotary seat (243) is interference-fitted at a predetermined position in the slag-forming area of the converter body (1) corresponding to the oxygen blowing pipe (24).
9. The rapid slag-forming device for inhibiting slag re-drying in converters with low-iron molten iron according to claim 1, characterized in that: The oxygen blowing pipes (247) are all inclined at the same angle around the oxygen blowing pipe (24), and their lower ends are inserted into the molten iron.
10. A rapid slag-forming method for inhibiting slag re-drying in low-iron-temperature converters, characterized in that, The rapid slag-forming device for inhibiting slag re-drying in low-iron molten iron converters according to any one of claims 1-9 comprises the following specific steps: S1. After the pre-process is completed, the molten iron enters the converter furnace body (1), the tilting mechanism makes it vertical, the coil cover (21) is closed to form a closed space, the temperature is cooled by circulating cooling water, the flue gas is output through the exhaust pipe (22), and the lifting lug (211) ensures the stability of the assembly. S2. The oxygen blowing pipe (24) is lowered and inserted into the raw material, the sealing plate (242) enhances the airtightness, the cooling water channel cools down, and the oxygen supply equipment blows oxygen through the oxygen blowing pipe (24) to promote the oxidation reaction of the raw material to generate molten steel; S3. For smelting with low iron-to-water ratio, the first batch of composite slag-forming agent (containing 30-40% Al2O3, 35-45% CaO, etc., melting point <1300℃) is added at 1.5-2.0 kg per ton of steel through the corresponding feed port (231) on the periphery within 3 minutes of the initial blowing stage. The conventional slag material is added at 2 / 3 of the amount through another corresponding feed port (231) to solve the problem of slag not dissolving in the early stage. S4. When the slag material is dried during the blowing process, the oxygen pressure rises and triggers the opening of the pressure relief valve in the one-way air hole (244) on the positioning rotary seat (243). Oxygen enters the annular maintenance channel (246) in the rotating ring (245), driving the L-shaped air-push inclined oxygen pipe (247) to rotate, breaking up the slag material and supplying oxygen to the deep layer. At the same time, the L-shaped air-push inclined oxygen pipe (247) drives the cam (249) to rotate through the wall plate (248), pushing the spring valve rod (233) in the moving valve channel (232), so that the second batch of slag-forming agent (0.5-1.0 kg per ton of steel) enters the furnace through the feeding valve hole (234) from the corresponding feeding port (231). After mixing, it reduces the melting point and basicity of the slag and quickly solves the problem of drying. S5. After steelmaking is completed, remove the slag and molten steel according to the specifications.