A baking device for steel plants

Abstract

This utility model discloses a baking device for steelmaking plants, including a baking furnace body, a combustion nozzle assembly, and a slag collection trough. The baking furnace body has a feed inlet at the top and a discharge outlet at the bottom. The combustion nozzle assembly is vertically positioned above the interior of the baking furnace body. The slag collection trough is located below the baking furnace body, with an open top connecting to the discharge outlet. The bottom wall of the slag collection trough is inclined, and a spiral slag discharger rotates within it, with its axis parallel to the bottom wall. This utility model adjusts the height of the injection pipe and nozzle by extending and retracting the first cylinder of the combustion nozzle assembly, thus optimizing baking uniformity for materials of different thicknesses. After baking, the slag falls into the slag collection trough through the discharge outlet and slides along the inclined bottom wall towards the spiral slag discharger. The rotating spiral blades, with a variable pitch structure, push the slag towards the outlet, improving slag discharge efficiency.

Description

Technical Field

[0001] This utility model relates to the field of steelmaking technology, and in particular to a baking device for steelmaking plants. Background Technology

[0002] Currently, all continuous casting processes use protective slag. Protective slag serves several functions: heat insulation, air isolation, prevention of secondary oxidation of molten steel, purification of the steel-slag interface, adsorption of inclusions in the molten steel, lubrication of the billet shell, and improvement of solidification heat transfer. In actual continuous casting production, the moisture content of the protective slag is generally controlled to be less than 0.5%. When the moisture content is greater than 0.5%, the protective slag is prone to clumping, resulting in waste. Furthermore, it cannot be used when the moisture content is greater than 1.0%, otherwise it can easily cause bubbles and cracks in the steel billet, posing a safety hazard.

[0003] Therefore, it is essential to achieve the baking of protective slag. In existing technologies, the nozzles of protective slag baking devices are usually fixed at the bottom and cannot be adjusted in height. Furthermore, the design of the slag collection trough and slag discharge device is relatively simple, making it difficult to efficiently collect and discharge slag. Therefore, a device that can flexibly adjust the nozzle height and optimize slag discharge efficiency is needed. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a baking device for steelmaking plants, which solves the issues of existing protective slag baking devices being unable to flexibly adjust the nozzle height and having low slag discharge efficiency.

[0005] This utility model is implemented as follows:

[0006] A baking apparatus for a steel plant, comprising:

[0007] The baking oven body has a feeding port at the top and a discharging port at the bottom;

[0008] The combustion nozzle assembly is vertically positioned above the interior of the baking oven body;

[0009] A slag collection trough is located below the baking furnace body. The top of the slag collection trough is open and connected to the discharge port. The bottom wall of the slag collection trough is inclined. A spiral slag discharger is rotatably installed inside the slag collection trough. The axis of the spiral slag discharger is parallel to the bottom wall of the slag collection trough.

[0010] Furthermore, the spiral slag discharger includes a spiral shaft, and spiral blades are fixedly provided on the outer wall of the spiral shaft. The spiral blades adopt a variable pitch structure, and the pitch of the spiral blades at the outlet end away from the slag collection trough is greater than the pitch at the outlet end closer to the slag collection trough.

[0011] Furthermore, a drive motor is provided at one end of the outer wall of the slag collection tank. The drive motor is fixedly connected to the slag collection tank through an inclined plate. The drive shaft of the drive motor is fixedly connected to one end of the spiral shaft. The axis of the drive motor is arranged parallel to the bottom wall inside the slag collection tank.

[0012] Furthermore, the top of the baking oven body is provided with a top plate and a cover plate. The top plate is fixedly connected to the baking oven body, and the cover plate is hinged to the baking oven body via a hinge.

[0013] Furthermore, the combustion nozzle assembly includes a first cylinder disposed on the top plate, the piston rod of the first cylinder passing through the top plate and extending into the baking oven body, and an injection pipe fixedly connected to the bottom of the piston rod, wherein multiple nozzles are evenly arranged on the injection pipe.

[0014] Furthermore, the injection pipeline is connected to an external gas source via a gas supply pipeline, which penetrates the side wall of the baking oven and is made of flexible hose.

[0015] Furthermore, the nozzle is tilted, with the nozzle forming an angle of 30° to 60° with the horizontal plane.

[0016] Furthermore, two door panels are rotatably and openably installed at the bottom of the discharge port, and the two door panels open or close the discharge port through an opening and closing device.

[0017] Furthermore, the opening and closing device includes fixed shafts symmetrically arranged on the outer sides of two side walls at the lower part of the baking oven body. Each fixed shaft is provided with a support plate. One end of the support plate is rotatably connected to the fixed shaft, and the other end is fixedly connected to the door panel on the corresponding side. A gear is also fixedly connected to the outer side wall of each support plate. Two gears are respectively rotatably sleeved on the outer side of the corresponding fixed shaft and meshed. A second cylinder is connected to the middle of the support plate. The fixed end of the second cylinder is hinged to one of the support plates, and the movable end of the second cylinder is hinged to the other support plate.

[0018] Furthermore, the bottom wall of the slag collection tank is inclined at an angle of 15° to 20° to the horizontal plane.

[0019] The beneficial effects of this utility model are:

[0020] This utility model relates to a baking device for steelmaking plants. By extending and retracting the first cylinder of the combustion nozzle assembly, the height of the injection pipeline and nozzle can be adjusted, thus optimizing the baking uniformity for different material thicknesses. After baking, the slag falls into the slag collection trough through the discharge port and slides along the inclined bottom wall towards the spiral slag discharger. The rotating spiral blades push the slag towards the outlet end with a variable pitch structure, improving the slag discharge efficiency. The pitch at the outlet end is reduced, and the slag is compressed and discharged, avoiding backflow. The second cylinder in the opening and closing device is hinged at both ends to the middle of the two support plates. When it extends and retracts, it drives the two gears to rotate, causing the door plate to open or close. This design achieves precise control of the discharge port and avoids material jamming. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0022] Figure 2 This is a three-dimensional structural diagram of the slag collection trough and spiral slag discharger of this utility model;

[0023] Figure 3 This is a cross-sectional view of the internal structure of the slag collection tank and spiral slag discharger of this utility model;

[0024] Figure 4 This is a three-dimensional structural schematic diagram of the combustion nozzle assembly of this utility model;

[0025] Figure 5 This is a three-dimensional structural diagram of the opening and closing device of this utility model.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Baking oven body; 11. Top plate; 12. Cover plate; 13. Door panel;

[0028] 14. Opening and closing device; 141. Fixed shaft; 142. Support plate; 143. Gear; 144. Second cylinder;

[0029] 2. Combustion nozzle assembly; 21. First cylinder; 22. Injection pipe; 23. Nozzle; 24. Connecting plate; 25. Pin;

[0030] 3. Slag collection trough; 31. Drive motor; 32. Inclined plate;

[0031] 4. Spiral slag discharge device; 41. Spiral shaft; 42. Spiral blades. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Many specific details are set forth in the following description to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] like Figures 1-5 The present invention relates to a baking device for steelmaking plants, comprising a baking furnace body 1, a combustion nozzle assembly 2, and a slag collection trough 3. The baking furnace body 1 has a feed inlet at the top and a discharge outlet at the bottom. The combustion nozzle assembly 2 is raised and lowered and positioned above the interior of the baking furnace body 1. The slag collection trough 3 is positioned below the baking furnace body 1, with an open top that connects to the discharge outlet. The bottom wall of the slag collection trough 3 is inclined, and a spiral slag discharger 4 is rotatably mounted inside the slag collection trough 3. The axis of the spiral slag discharger 4 is parallel to the bottom wall of the slag collection trough 3.

[0034] The baking oven body 1 has a feeding port at the top for feeding materials and a discharge port at the bottom for discharging baked materials. The interior of the baking oven body 1 forms a high-temperature baking chamber. The bottom of the baking oven body 1 has a conical structure to facilitate the smooth discharge of materials from the discharge port. The top of the baking oven body 1 is equipped with a top plate 11 and a cover plate 12. The top plate 11 is fixedly connected to the baking oven body 1, providing support and protection. The cover plate 12 is hinged to the baking oven body 1 via a hinge (not shown in the figure). Materials such as protective slag to be baked are added into the baking oven body 1 by opening the cover plate 12. After the materials are added into the baking oven body 1, the cover plate 12 is closed to seal the interior of the baking oven body 1.

[0035] The combustion nozzle assembly 2 is vertically positioned above the baking oven body 1. The combustion nozzle assembly 2 includes a first cylinder 21 mounted on a top plate 11. The first cylinder 21 is vertically positioned, and its piston rod extends through the top plate 11 and into the baking oven body 1. A spray pipe 22 is fixedly connected to the bottom of the piston rod, and multiple nozzles 23 are evenly distributed along the spray pipe 22, communicating with it. In this embodiment, two connecting plates 24 are sequentially fixed along the axial direction of the spray pipe 22. The two connecting plates 24 are located outside the lugs of the piston rod, and are fixedly connected to the lugs by pins 25. The multiple nozzles 23 are inclined, forming an angle of 30° to 60° with the horizontal plane. Within this angle range, the flame can more effectively cover the material, improving baking efficiency and quality. Furthermore, the inclined nozzle design of the nozzles 23 creates a vortex in the flame, improving fuel-air mixing efficiency. The injection pipe 22 is connected to an external gas source via a gas supply pipe (not shown in the figure). The gas supply pipe runs through the side wall of the baking oven body 1 and is made of flexible hose, which is a high-temperature resistant hose to accommodate the deformation requirements of the injection pipe 22 during lifting and lowering. The first cylinder 21 extends and retracts, and its piston rod drives the injection pipe 22 and nozzle 23 to rise and fall vertically. By adjusting the height of the injection pipe 22 through the first cylinder 21, the baking uniformity can be optimized for different material thicknesses.

[0036] The bottom of the discharge port of the baking oven body 1 is equipped with two rotatable door panels 13. The two door panels 13 open or close the discharge port via an opening and closing device 14. The opening and closing device 14 includes fixed shafts 141 symmetrically arranged on the outer sides of two side walls at the lower part of the baking oven body 1. Each fixed shaft 141 is fitted with a support plate 142. One end of the support plate 142 is rotatably connected to the fixed shaft 141, and the other end is fixedly connected to the corresponding door panel 13. The door panel 13 is hinged to the fixed shaft 141 on the side wall of the baking oven body 1 via the support plate 142. A gear 143 is also fixedly connected to the outer side wall of each support plate 142. The two gears 143 are respectively rotatably sleeved on the outer side of the corresponding fixed shaft 141 and meshed, ensuring that the door panel 13 moves synchronously. A second cylinder 144 is connected to the middle of the support plate 142. The fixed end of the second cylinder 144 is hinged to one of the support plates 142, and the movable end of the second cylinder 144 is hinged to the other support plate 142. Both ends of the second cylinder 144 are hinged to the middle of the two support plates 142 respectively. During extension and retraction, it pushes two gears 143 to rotate, causing the door plate 13 to open or close. This design achieves precise control of the discharge port and avoids material jamming.

[0037] The slag collection trough 3 is located below the baking furnace body 1. The top of the slag collection trough 3 is open and connected to the discharge port. The bottom wall of the slag collection trough 3 is inclined, forming an angle of 15° to 20° with the horizontal plane. This angle ensures that the slag slides smoothly towards the outlet end without affecting the structural stability of the slag collection trough 3 due to an excessively large angle. A spiral slag discharger 4 is rotatably installed inside the slag collection trough 3. The axis of the spiral slag discharger 4 is parallel to the bottom wall of the slag collection trough 3, ensuring efficient conveying of slag along the inclined surface of the bottom wall to the outlet end of the slag collection trough 3. The spiral slag discharger 4 includes a spiral shaft 41, with spiral blades 42 fixed to the outer wall of the spiral shaft 41. The spiral blades 42 adopt a variable pitch structure, with the pitch of the spiral blades 42 farther from the outlet end of the slag collection trough 3 being greater than the pitch closer to the outlet end. That is, the smaller pitch closer to the outlet end of the slag collection trough 3 increases the extrusion pressure to prevent slag blockage; the larger pitch farther from the outlet end accelerates the initial slag conveying speed. A drive motor 31 is provided at one end of the outer wall of the slag collection tank 3. The drive motor 31 is fixedly connected to the slag collection tank 3 via an inclined plate 32. The drive shaft of the drive motor 31 is fixedly connected to one end of the spiral shaft 41. The axis of the drive shaft of the drive motor 31 is set parallel to the bottom wall inside the slag collection tank 3.

[0038] After baking, the slag falls into the slag collection trough 3 through the discharge port and slides along the inclined bottom wall towards the spiral slag discharger 4. The drive motor 31 starts, and the spiral blades 42 push the slag towards the outlet end with a variable pitch structure. The pitch at the outlet end decreases, and the slag is compressed and discharged to avoid backflow.

[0039] When using the baking device for steelmaking plants, the cover plate 12 is opened, the discharge port is closed, and the first cylinder 21 is started. The first cylinder 21 contracts, causing the nozzle 23 to rise to its highest position. The user puts the protective slag into the baking furnace body 1. The first cylinder 21 extends, causing the spray pipe 22 and multiple nozzles 23 to descend to a certain distance above the protective slag. The external air source is turned on, and air and fuel are supplied to the multiple nozzles 23 through the air supply pipe, and spraying is carried out. After baking for a predetermined time, the baking furnace body 1 reaches the predetermined temperature. The first cylinder 21 contracts, causing the spray pipe 22 and multiple nozzles 23 to rise to a certain height. Then, baking is carried out again to raise the temperature inside the baking furnace body 1 and continue for a period of time, maintaining uniform baking of the protective slag. After baking, the second cylinder 144 of the opening and closing device 14 extends and pushes the two gears 143 to rotate, causing the door panel 13 to open. The protective slag falls into the slag collection trough 3 below. The drive motor 31 is started, and the drive motor 31 drives the spiral slag discharger 4 to rotate. The protective slag first slides freely down the inclined bottom wall from top to bottom. The material at the higher end of the bottom wall is relatively less, which is the sparse area, and the material at the lower end is relatively more, which is the dense area. The spiral blades 42 with a large pitch can accelerate the movement of the material in the sparse area to the material in the dense area. The material in the dense area near the outlet end is prevented from clogging the outlet by the spiral blades 42 with a small pitch.

[0040] While this utility model discloses preferred embodiments to achieve the above objectives, it is not intended to limit the structural features of this utility model. Anyone skilled in the art should know that any easily conceivable variations or modifications are possible under the technical spirit of this utility model and are covered by the patent claims of this utility model.

Claims

1. A roasting apparatus for a steel mill, characterized by, include: The baking oven body has a feeding port at the top and a discharging port at the bottom; The combustion nozzle assembly is vertically positioned above the interior of the baking oven body; A slag collection trough is located below the baking furnace body. The top of the slag collection trough is open and connected to the discharge port. The bottom wall of the slag collection trough is inclined. A spiral slag discharger is rotatably installed inside the slag collection trough. The axis of the spiral slag discharger is parallel to the bottom wall of the slag collection trough.

2. The roasting device for a steelworks according to claim 1, characterized in that, The spiral slag discharger includes a spiral shaft, and spiral blades are fixed on the outer wall of the spiral shaft. The spiral blades adopt a variable pitch structure, and the pitch of the spiral blades at the outlet end away from the slag collection trough is greater than the pitch at the outlet end closer to the slag collection trough.

3. The roasting device for a steelworks according to claim 2, characterized in that, A drive motor is provided at one end of the outer wall of the slag collection tank. The drive motor is fixedly connected to the slag collection tank through an inclined plate. The drive shaft of the drive motor is fixedly connected to one end of the spiral shaft. The axis of the drive motor is parallel to the bottom wall inside the slag collection tank.

4. The roasting device for a steelworks according to claim 1, characterized in that, The top of the baking oven body is provided with a top plate and a cover plate. The top plate is fixedly connected to the baking oven body, and the cover plate is hinged to the baking oven body via a hinge.

5. The roasting device for a steelworks according to claim 4, characterized in that, The combustion nozzle assembly includes a first cylinder disposed on the top plate, the piston rod of the first cylinder passing through the top plate and extending into the baking oven body, and an injection pipe fixedly connected to the bottom of the piston rod, with multiple nozzles evenly arranged on the injection pipe.

6. The roasting device for a steelworks according to claim 5, characterized in that, The injection pipeline is connected to an external gas source via a gas supply pipeline, which runs through the side wall of the baking oven and is made of flexible hose.

7. The roasting device for a steelworks according to claim 5, characterized in that, The nozzle is tilted, with an angle of 30° to 60° between the nozzle and the horizontal plane.

8. The baking apparatus for steelmaking plants according to claim 1, characterized in that, The bottom of the discharge port is equipped with two rotating door panels, which open or close the discharge port via an opening and closing device.

9. The roasting device for a steelworks according to claim 8, characterized in that, The opening and closing device includes fixed shafts symmetrically arranged on the outer sides of two side walls at the bottom of the baking oven body. Each fixed shaft is provided with a support plate. One end of the support plate is rotatably connected to the fixed shaft, and the other end is fixedly connected to the door panel on the corresponding side. A gear is also fixedly connected to the outer side wall of each support plate. Two gears are respectively rotatably sleeved on the outer side of the corresponding fixed shaft and meshed. A second cylinder is connected to the middle of the support plate. The fixed end of the second cylinder is hinged to one of the support plates, and the movable end of the second cylinder is hinged to the other support plate.

10. The roasting device for a steel mill according to claim 1, characterized in that, The bottom wall of the slag collection tank is inclined at an angle of 15° to 20° to the horizontal plane.

Images