A slag dam for a VOD furnace

Abstract

The novel relates to the technical field of VOD furnace accessories, and discloses a slag baffle plate for a VOD furnace, which comprises a slag baffle plate horizontally arranged and provided with a mounting sleeve ring on the outer side, and a top disc provided at the top of the mounting sleeve ring and arranged in the VOD furnace through the mounting sleeve ring; a heat recovery module is arranged between the top disc and the slag baffle plate and comprises a flow guide plate arranged at the bottom of the top disc, the flow guide plate is arranged in a spiral shape and is arranged to be wound around each other between the top disc and the slag baffle plate, one end of the flow guide plate is correspondingly arranged at the middle of the top disc, and the other end is connected with a water inlet pipe or a water outlet pipe; a vacuum air extraction module and a feeding module are respectively arranged through the slag baffle plate and the top disc, the VOD furnace is kept in vacuum through the vacuum air extraction module, and feeding is carried out through the feeding module. Compared with the prior art, the cooling system of the slag baffle plate directly exchanges heat with cold matter, the heat exchange efficiency is improved, and the cold matter moves around the slag baffle plate, so that the cooling is more uniform.

Description

Technical Field

[0001] This utility model relates to the technical field of VOD furnace accessories, specifically to a slag baffle for a VOD furnace. Background Technology

[0002] A VOD furnace, or vacuum oxygen decarburization furnace, is a key piece of equipment used for refining stainless steel and special steels. Its core function is to produce high-quality steels such as ultra-low carbon and nitrogen stainless steel through oxygen decarburization and argon stirring in a vacuum environment. Its specific structure includes a vacuum system, oxygen lance, anti-splash design, ladle and feeding system. The slag baffle is one of the important components of the anti-splash design, which effectively reduces the contamination of the vacuum vessel by the steel slag splashed from the VOD furnace by blocking the steel slag splashed from the VOD furnace.

[0003] Existing slag baffles are equipped with cooling systems to lower their own temperature and extend their service life, while also recovering heat. However, most existing slag baffle cooling systems only cool the slag baffle through heat exchange coils. Heat transfer between the cold material and the high-temperature slag baffle needs to be carried out through a medium such as air, which reduces the cooling effect and heat exchange efficiency of the slag baffle. In addition, the slag baffle is equipped with vacuum extraction pipes and feeding pipes, making it difficult to evenly arrange the heat exchange coils according to the complex situation of the slag baffle, resulting in uneven cooling. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the above-mentioned technical difficulties and provide a slag baffle for a VOD furnace, wherein the cooling system directly exchanges heat with the slag baffle and can uniformly cool the slag baffle.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows: A slag baffle for a VOD furnace, comprising: The slag baffle is arranged horizontally, with an installation ring on the outer side and a top plate on the top of the installation ring. The slag baffle is installed in the VOD furnace through the installation ring. The heat recovery module is set between the top plate and the slag baffle plate, including the guide plate set at the bottom of the top plate. The guide plate is arranged in a vortex shape, and a pair of them are arranged intertwined between the top plate and the slag baffle plate. One end of each guide plate is set at the middle of the top plate, and the other end is connected to the inlet pipe or outlet pipe. The vacuum extraction module and the feeding module are respectively installed through the slag baffle plate and the top plate. The vacuum is maintained in the VOD furnace by the vacuum extraction module and the feeding is carried out by the feeding module.

[0006] As an improvement, the top of the baffle plate is provided with heat-conducting fins, and two sets of heat-conducting fins are arranged along the guide plates between the two guide plates to increase the heat exchange area.

[0007] As an improvement, the slag baffle is an incomplete spherical shell structure with a concave bottom surface and a circular mounting slot in the middle. A mounting sleeve is provided on the top plate corresponding to the mounting slot, so that the steel slag splashed onto the slag baffle can flow and fall more easily.

[0008] As an improvement, the vacuum pumping module includes a gas distribution ring pipe, which is sleeved and fixed inside the mounting sleeve. Multiple suction slots are evenly arranged at the bottom, and multiple diversion pipes are evenly arranged circumferentially at the top. An adapter is provided directly above the top. Each diversion pipe is arranged vertically, and its other end is connected to the adapter. A pumping pipe connected to the vacuum pump is provided at the top of the adapter.

[0009] As an improvement, the feeding module includes a feeding pipe, which is set on the top of the top plate by a support rod, and the bottom is sleeved and fixed inside the air distribution ring pipe, and the top is connected to the feeding valve.

[0010] As an improvement, a secondary baffle is also included, which is an incomplete spherical shell structure with a concave bottom surface. It is sleeved and fixed to the bottom of the feed pipe and has a gap with the slag baffle plate. The secondary baffle protects the air ring pipe.

[0011] The advantages of this utility model compared with the prior art are as follows: 1. This utility model is equipped with a heat recovery module, which directly contacts the slag baffle for heat exchange. The heat exchange area is increased by heat-conducting fins to improve its heat exchange efficiency. At the same time, the flow guide plate guides the flow of the cold mass, so that the cold mass continuously moves around the slag baffle, resulting in more uniform heat dissipation and better cooling effect.

[0012] 2. The slag baffle of this utility model is an incomplete spherical shell structure arranged from the inside to the outside. Its bottom surface is concave. When steel slag splashes onto the slag baffle, it will flow outward along the bottom surface of the slag baffle, so that more steel slag falls into the molten iron near the inner wall of the VOD furnace, which facilitates slag discharge.

[0013] 3. This utility model is equipped with a secondary baffle plate, which can protect the air distribution ring pipe of the vacuum pumping module and prevent steel slag splashing from causing pollution and damage to it. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model. Figure 1 .

[0015] Figure 2 This is a schematic diagram of the structure of this utility model. Figure 2 .

[0016] Figure 3 This is a front cross-sectional view of the present invention.

[0017] Figure 4 This is a side sectional view of the present invention.

[0018] Figure 5 This is a schematic diagram showing the unfolded structure of this utility model.

[0019] As shown in the figure: 1. Slag baffle; 2. Mounting collar; 3. Top plate; 4. Air distribution ring pipe; 5. Diverter pipe; 6. Adapter; 7. Air extraction pipe; 8. Feeding pipe; 9. Support rod; 10. Secondary baffle plate; 11. Guide plate; 12. Heat-conducting fins; 13. Water inlet pipe; 14. Water outlet pipe; 15. Mounting sleeve; 16. Mounting slot; 17. Water inlet; 18. Water outlet. Detailed Implementation

[0020] In the description of this utility model, it should be understood that the terms "center," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, 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 one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. Additionally, the term "comprising" and any variations thereof are intended to cover non-exclusive inclusion.

[0021] The present invention will now be described in further detail with reference to the accompanying drawings.

[0022] like Figure 1 , Figure 2 As shown, a slag-blocking plate for a VOD furnace includes a slag-blocking plate 1, which is a horizontally arranged, incompletely spherical shell structure with a concave bottom surface. A circular mounting slot 16 is provided in the middle, and a mounting collar 2 is provided on the outer side. A top plate 3 is provided on the top of the mounting collar 2. A water inlet 17 and a water outlet 18 are respectively provided on both sides of the top surface of the top plate 3. A mounting sleeve 15 is provided in the middle corresponding to the mounting slot 16 and is connected to the mounting slot 16. A heat recovery module is provided between the top plate 3 and the slag-blocking plate 1. A vacuum extraction module and a feeding module are provided on the top plate 3. The vacuum extraction module and the feeding module are respectively provided through the slag-blocking plate and the top plate. The slag-blocking plate 1 is installed in the VOD furnace through the mounting collar 2.

[0023] like Figure 3 , Figure 4 , Figure 5As shown, the heat recovery module includes a guide plate 11 at the bottom of the top plate 3. The guide plate 11 is arranged in a vortex shape, and a pair of them are arranged intertwined between the top plate 3 and the baffle plate 1 (the arrangement is similar to that of a mosquito coil). After one end of the two guide plates 11 is set at the middle of the top plate 3, the fluid is connected in the middle of the top plate 3. The other end is set at the inlet 17 and the outlet 18 respectively. The inlet 17 is provided with an inlet pipe 13, and the outlet 18 is provided with an outlet pipe 14. The top of the baffle plate 1 is provided with heat-conducting fins 12, and two sets of heat-conducting fins 12 are arranged along the guide plate 11 between the two guide plates 11.

[0024] like Figure 3 , Figure 5 As shown, the vacuum pumping module includes a gas distribution ring pipe 4, which is sleeved and fixed inside the mounting sleeve 15. Multiple suction slots are evenly arranged at the bottom, and three diversion pipes 5 are evenly arranged circumferentially at the top. An adapter 6 is arranged directly above the top. Each diversion pipe 5 is arranged vertically, and its other end is connected to the adapter 6. The top of the adapter 6 is provided with a pumping pipe 7 connected to the vacuum pump.

[0025] like Figure 4 , Figure 5 As shown, the feeding module includes a feeding pipe 8, which is set on the top of the top plate 3 by a support rod 9 and is connected to the feeding valve at the top. The bottom passes through the gas distribution ring pipe 4 and is sleeved and fixed inside the gas distribution ring pipe 4. A secondary baffle 10 is sleeved and fixed thereon. The secondary baffle 10 is an incomplete spherical shell structure with a concave bottom surface and has a gap with the slag baffle plate 1, so that the gas distribution ring pipe 4 is connected to the VOD furnace below the slag baffle plate 1.

[0026] The slag baffle 1 and the auxiliary baffle 10 are made of high-temperature resistant materials that are commonly known to the public.

[0027] In the specific implementation of this embodiment: After the slag baffle 1 is installed in the VOD furnace via the mounting ring 2, the VOD furnace is started, and cold material (water) is supplied between the top plate 3 and the slag baffle 1 through the water inlet pipe 13. After the steel slag on the surface of the molten iron in the VOD furnace splashes, it splashes onto the slag baffle 1 or the auxiliary baffle plate 10, and flows outward along the bottom concave surface before falling down. More steel slag on the slag baffle 1 falls into the molten iron near the inner wall of the VOD furnace, which facilitates slag discharge (after oxygen blowing for decarburization and argon stirring, the steel slag is sent to the outer side by the flowing molten iron). During the process, oxygen blowing for decarburization and argon stirring are carried out, and the added oxygen, argon and carbon monoxide generated by the reaction are drawn out and discharged through the vacuum pumping module to meet the relevant process of the VOD furnace. At the same time, materials are added through the feeding module.

[0028] During the operation of the VOD furnace, the slag baffle 1 is heated, and its temperature rises. The heat is transferred to the cold mass through the heat-conducting fins 12. After the cold mass is input through the water inlet pipe 13, it flows inward in a vortex shape between the two guide plates 11 under the action of the guide plates 11, exchanging heat with the heat-conducting fins 12. After passing through the middle of the top plate 3, it flows outward in a vortex shape between the two guide plates 11, exchanging heat with the heat-conducting fins 12. Finally, it leaves through the water outlet pipe 14, and the heat is recovered and utilized by external heat exchangers, etc. During the process, the cold mass moves around the slag baffle 1, thereby improving the uniformity of cooling.

[0029] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A slag-blocking plate for a VOD furnace, characterized in that, include: The slag baffle (1) is arranged horizontally, with an installation ring (2) on the outside and a top plate (3) on the top of the installation ring (2). The slag baffle (1) is installed in the VOD furnace through the installation ring (2). The heat recovery module is set between the top plate (3) and the slag baffle (1), including the guide plate (11) set at the bottom of the top plate (3). The guide plate (11) is arranged in a vortex shape, and a pair of them are arranged intertwined between the top plate (3) and the slag baffle (1). One end of each is set in the middle of the top plate (3), and the other end is connected to the water inlet pipe (13) or the water outlet pipe (14). The vacuum extraction module and the feeding module are respectively set through the slag baffle (1) and the top plate (3). The vacuum is maintained in the VOD furnace by the vacuum extraction module and the feeding is carried out by the feeding module.

2. The slag-blocking disc for a VOD furnace according to claim 1, characterized in that: The slag baffle (1) is an incomplete spherical shell structure with a concave bottom surface and a circular mounting slot (16) in the middle. The top plate (3) is provided with a mounting sleeve (15) corresponding to the mounting slot (16).

3. The slag-blocking disc for a VOD furnace according to claim 1, characterized in that: The top of the baffle plate (1) is provided with heat-conducting fins (12), and two sets of heat-conducting fins (12) are provided between the two guide plates (11) along the guide plates (11).

4. A slag-blocking disc for a VOD furnace according to claim 2, characterized in that: The vacuum pumping module includes a gas distribution ring pipe (4), which is fitted and fixed inside the mounting sleeve (15). Multiple suction slots are evenly arranged at the bottom, and multiple diversion pipes (5) are evenly arranged around the top. An adapter (6) is arranged directly above the top. Each diversion pipe (5) is arranged vertically, and its other end is connected to the adapter (6). The top of the adapter (6) is equipped with a pumping pipe (7) connected to the vacuum pump.

5. A slag-blocking disc for a VOD furnace according to claim 4, characterized in that: The feeding module includes a feeding pipe (8), which is set on the top of the top plate (3) by a support rod (9), and the bottom is sleeved and fixed inside the air distribution ring pipe (4), and the top is connected to the feeding valve.

6. A slag-blocking disc for a VOD furnace according to claim 5, characterized in that: It also includes a secondary baffle (10), which is an incomplete spherical shell structure with a concave bottom surface, and is fitted and fixed to the bottom of the feed pipe (8), with a gap between it and the slag baffle (1).

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