A discharge device for a drum dryer for metallurgical material

Abstract

The application discloses a discharging device for a drum dryer for metallurgical materials, which comprises a material guiding cover, a flue gas passage, a roller, a first rotating shaft, a second rotating shaft, a spiral blade and a dust removal mechanism, the lower part of the material guiding cover is provided with a first discharging opening, the flue gas passage is in the shape of a Chinese character 'fang', the inlet of the flue gas passage is horizontally connected with the first discharging opening, the outlet of the flue gas passage is connected with the upper part of the material guiding cover, the first rotating shaft and the second rotating shaft form an L-shaped structure and are connected through a bevel gear, the roller is fixed on the first rotating shaft and is used for the frictional rolling connection of the discharging opening of the drum dryer, the spiral blade is fixed on the second rotating shaft and is located in the flue gas passage together with the second rotating shaft, the inlet of the flue gas passage is sequentially provided with a second discharging opening and the dust removal mechanism, and the dust removal mechanism uses an oil film to adsorb the smoke dust in the flue gas passage. The application does not need to additionally install a fan, saves energy, simultaneously realizes the oil film dust removal function in the discharging process and solves the environmental pollution problem.

Description

Technical Field

[0001] This invention relates to the field of waste gas treatment, and in particular to a discharge device for a rotary drum dryer for metallurgical materials. Background Technology

[0002] Before steelmaking and smelting, metallurgical materials must have moisture and other volatile substances removed to avoid splashing during the smelting process. The equipment used is usually a rotary drum dryer. After the materials are dried in the rotary drum dryer, they are discharged into storage tanks. During the process of the materials falling, a large amount of dust is generated and floats in the air, which seriously pollutes the surrounding environment. The dust needs to be collected and treated.

[0003] Patent document 201610296944.7 discloses a special oil film dust collector and its dust removal method for vacuum steelmaking. The dust is discharged into the dust collector by a fan and then comes into reverse contact with the oil discharged above to achieve the function of adsorption and dust removal of the material. However, this method requires the use of an exhaust fan to collect the exhaust gas first. Since the discharge port diameter of the drum dryer is very large and the exhaust pipe diameter of the exhaust fan is small, the two are obviously incompatible. At the same time, the dust removal process requires electricity to continuously run the fan and oil pump, which is a waste of energy and increases the enterprise cost. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a discharge device for a rotary drum dryer for metallurgical materials, so as to solve the problems that existing dust removal equipment is not compatible with rotary drum dryers and that the dust removal process requires additional energy.

[0005] The objective of this invention is achieved through the following technical solution: a discharge device for a rotary drum dryer for metallurgical materials, comprising a guide hood, a flue gas channel, rollers, a first rotating shaft, a second rotating shaft, spiral blades, and a dust removal mechanism. The lower part of the guide hood is provided with a first discharge port. The flue gas channel is U-shaped, with its inlet horizontally connected to the first discharge port and its outlet connected to the upper part of the guide hood. The first and second rotating shafts form an L-shaped structure and are connected by bevel gear meshing. The rollers are fixed on the first rotating shaft and are used for frictional rolling connection to the discharge port of the rotary drum dryer. The spiral blades are fixed on the second rotating shaft and are located within the flue gas channel together with the second rotating shaft. The inlet of the flue gas channel is sequentially provided with a second discharge port and a dust removal mechanism, which uses an oil film to adsorb dust from the flue gas channel.

[0006] Principle explanation: The rotation of the drum dryer drives the rollers to rotate, and the rotation of the rollers drives the first shaft and the second shaft in sequence. The spiral blades on the second shaft rotate under the drive of the second shaft, pushing the gas in the flue gas channel to flow counterclockwise from bottom to top, so that the flue gas generated during the discharge process enters the flue gas channel. The dust removal mechanism installed in the flue gas channel performs dust collection treatment on the passing airflow.

[0007] Preferably, the dust removal mechanism includes an oil storage tank, a third rotating shaft, and a turntable. The first rotating shaft, the second rotating shaft, and the third rotating shaft form a U-shape and are connected by bevel gear meshing. The third rotating shaft is located above the oil storage tank, and the turntable is coaxially fixedly connected to the third rotating shaft. The turntable is partially immersed in the oil storage tank.

[0008] Preferably, a scraper is provided in the oil storage tank. The scraper can rotate through the surface of the turntable and divides the oil in the oil storage tank into a U-shape. The scraper has two functions: first, it can quickly scrape off the oil that has adsorbed dust particles; second, it can separate the oil from the dust, so that the oil coated on the turntable is free of impurities and has a better dust adsorption effect.

[0009] Preferably, there are multiple turntables, each with multiple air passage holes. The multiple turntables are configured to cut off the flue gas passage, and the air passage holes on adjacent turntables are staggered to cause the flue gas to deflect and move, thereby improving the dust removal effect.

[0010] Preferably, the edge of the turntable is provided with multiple oil storage chambers, which are distributed in a ring at intervals. Each oil storage chamber is provided with an oil inlet hole. The oil storage chambers can store and release oil during the rotation of the turntable, thereby increasing the amount of oil film applied to the turntable and improving the dust collection effect.

[0011] Preferably, the oil storage cavity has a cuboid structure, and the oil storage cavity is also provided with a first oil outlet and a second oil outlet. The oil inlet is located at the edge of the turntable, and the first oil outlet and the second oil outlet are located close to the center of the turntable. The first oil outlet and the second oil outlet are located opposite each other at the corner of the oil storage cavity.

[0012] Preferably, a piston rod is provided inside the oil storage chamber, and a drive mechanism is provided on the turntable. The drive mechanism is used to drive the piston rod to reciprocate within the oil storage chamber.

[0013] Preferably, the turntable has a hollow cavity at its center. The driving mechanism includes a variable diameter disc, a fixed rod, and a spring, all located within the hollow cavity. The third rotating shaft is a tubular structure. The fixed rod is fitted inside the third rotating shaft and passes through the turntable and the third rotating shaft, respectively rotatably connected to both. The fixed rod passes through the variable diameter disc and is fixedly connected to it. A fixing plate is provided at the end of the piston rod. The spring is fitted on the piston rod, and the end of the spring presses against the fixing plate and the inner wall of the hollow cavity. The end of the piston rod pushes against the arc surface of the variable diameter disc.

[0014] Preferably, the variable diameter disc includes a first sector, a second sector, and a third sector. The first sector has the same radius, the second sector has a radius that gradually decreases relative to the first sector, and the third sector has a radius that gradually increases relative to the second sector. The first sector and the second sector are located below the variable diameter disc and are separated by the scraper.

[0015] The present invention has the following advantages: by using the rotational power provided by the original drum dryer to drive the second and third rotating shafts to rotate, the spiral blades on the second rotating shaft rotate to provide air pressure, and the third rotating shaft drives the turntable to rotate to apply oil and suck up dust. The entire device does not require an additional fan and oil pump, saving energy. At the same time, it achieves a highly efficient dust removal function during the material discharge process, solving the environmental pollution problem. Attached Figure Description

[0016] Figure 1 This is a cross-sectional structural schematic diagram of Embodiment 1 of the present invention;

[0017] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure at point A in the middle;

[0018] Figure 3 This is a cross-sectional structural diagram of Embodiment 2 of the present invention;

[0019] Figure 4 yes Figure 3 A schematic diagram of the cross-sectional structure at point B in the middle.

[0020] In the diagram, 1. Guide hood; 2. Flue gas passage; 3. First discharge port; 4. Roller; 5. First rotating shaft; 6. Second rotating shaft; 7. Spiral blade; 8. Oil storage tank; 9. Third rotating shaft; 10. Turntable; 11. Scraper; 12. Fixed rod; 13. Air passage hole; 14. Oil storage chamber; 15. Oil inlet; 16. First oil outlet; 17. Second oil outlet; 18. Hollow cavity; 19. Variable diameter plate; 20. Piston rod; 21. Fixed plate; 22. Spring; 23. First sector; 24. Second sector; 25. Third sector; 26. Second discharge port. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0023] Example 1

[0024] Rotary drum dryers for metallurgical materials, also known as rotary dryers, have a horizontally arranged cylindrical structure as their main body. Rollers are installed at both ends of the main body to support and drive the rotation of the drum. Support rollers, which help stabilize the rotation of the drum, and a transmission mechanism are installed at the bottom of the main body.

[0025] A discharge device for a rotary drum dryer for metallurgical materials, such as Figure 1 As shown, it includes a guide hood 1, a flue gas channel 2, a roller 4, a first rotating shaft 5, a second rotating shaft 6, a spiral blade 7, and a dust removal mechanism. The dust removal mechanism includes an oil storage tank (8), a third rotating shaft (9), and a turntable (10). The guide hood 1 is horizontally fastened to the discharge port of the drum dryer and is rotatably sealed to the drum dryer. The lower part of the guide hood 1 has a first discharge port 3. The flue gas channel 2 is U-shaped. The inlet of the flue gas channel 2 is horizontally connected to the first discharge port 3, and the outlet of the flue gas channel 2 is connected to the upper part of the guide hood 1.

[0026] Roller 4 is fixed on the left end of the first rotating shaft 5. Roller 4 is cylindrical. The first rotating shaft 5 passes through the guide cover 1 and is rotatably connected to the guide cover 1. Roller 4 is located inside the guide cover 1. Roller 4 is in frictional rolling connection with the inner cylinder surface of the discharge port of the drum dryer. The first rotating shaft 5, the second rotating shaft 6, and the third rotating shaft 9 form a U-shape. A bevel gear is installed on the right end of the first rotating shaft 5. A bevel gear is installed on the upper end of the second rotating shaft 6 and meshes with the right end of the first rotating shaft 5. A bevel gear is installed on the lower end of the second rotating shaft 6. A bevel gear is installed on the third rotating shaft 9 and meshes with the lower end of the second rotating shaft 6.

[0027] The flue gas passage 2 is provided with a second discharge port 26 and an oil storage tank 8 in sequence. The second discharge port 26 is a tubular structure and is used to connect to the external receiving cylinder. Metallurgical materials enter the receiving cylinder and the generated flue gas continues to flow backward in the flue gas passage 2.

[0028] The second rotating shaft 6 is inserted into the flue gas passage 2. The spiral blade 7 is fixed on the second rotating shaft 6 and is located in the vertical part of the flue gas passage 2 together with the second rotating shaft 6. The third rotating shaft 9 is a solid rod structure. The third rotating shaft 9 is located above the oil storage tank 8. The two ends of the third rotating shaft 9 are respectively rotatably connected to the side of the oil storage tank 8. The turntable 10 is coaxially fixedly connected to the third rotating shaft 9. The third rotating shaft 9 does not pass through the center of the turntable 10. The turntable 10 is partially immersed in the oil storage tank 8, and the oil storage tank 8 stores a certain volume of grease.

[0029] In some embodiments, the turntable 10 is installed parallel to the flue gas passage 2, so that the flue gas blows across the left and right surfaces of the turntable 10. At the same time, structures such as brushes can be added to the turntable 10 to increase the dust collection area.

[0030] In some embodiments, such as Figure 1 As shown, there are multiple turntables 10, and multiple air passage holes 13 are provided on the turntables 10. The air passage holes 13 are evenly distributed on the turntables 10. The multiple turntables 10 are arranged to cut off the flue gas passage 2. The air passage holes 13 on two adjacent turntables 10 are staggered so that the flue gas blows directly onto the surface of the turntable 10 and flows backward through the air passage holes 13 in sequence. The flue gas undergoes a deflection motion. During the deflection process, the metallurgical material particles in the flue gas continuously collide with the surface of the turntable 10 due to inertia, which improves the dust collection effect.

[0031] like Figure 1 , Figure 2 As shown, a scraper 11 is installed inside the oil storage tank 8. The upper part of the scraper 11 has multiple openings to accommodate the turntable 10. The lower part of the turntable 10 is located in the openings, and the scraper 11 is in close contact with the left and right surfaces of the turntable 10. The scraper 11 divides the oil in the oil storage tank 8 into a settling zone on the left and a supernatant zone on the right. The two parts form a U-shaped structure. During the counterclockwise rotation of the turntable 10, the scraper 11, which is fixedly installed, scrapes the oil down. The dust particles scraped down by the scraper 11 move downward in the settling zone and eventually fall to the bottom of the oil storage tank 8, realizing the stratification of oil and dust particles. The clean oil moves to the right and enters the supernatant zone, so that the turntable 10 can be coated with clean oil during its upward rotation, thereby improving the absorption effect of dust.

[0032] The surface of the turntable 10 is relatively smooth, resulting in less oil adhesion and a lower ability to absorb smoke and dust. Multiple oil storage chambers 14 are formed along the edge of the turntable 10, arranged in a ring at intervals. Each oil storage chamber 14 has two oil inlets 15, located on the left and right sides of the turntable 10 respectively. The oil storage chamber 14 has a cuboid structure. Two first oil outlets 16 and two second oil outlets 17 are also formed on the oil storage chamber 14, distributed on the left and right sides of the turntable 10. The oil inlets 15 are located at the edge of the turntable 10, while the first and second oil outlets 16 and 17 are positioned near the center of the turntable 10, opposite each other at the corners of the oil storage chambers 14. During rotation, when the oil storage chamber 14 is located at the lower part of the turntable 10... The oil storage chamber 14 is immersed below the oil surface of the oil storage tank 8. The oil fills the oil storage chamber 14 through the oil inlet 15. During counterclockwise rotation, the grease is discharged outward through the first oil outlet 16 and the second oil outlet 17 due to gravity. The high viscosity oil will flow downward along the disk surface of the turntable 10, realizing the oiling function. The first oil outlet 16 and the second oil outlet 17 are located at the corner of the oil storage chamber 14. They are located at the lowest point of the oil storage chamber 14 in different rotation positions, which is conducive to the oil being discharged from the oil storage chamber 14. When using low viscosity oil, in order to prevent the oil from spraying out of the first oil outlet 16 and the second oil outlet 17 in a columnar shape, a filter screen can be added to the first oil outlet 16 and the second oil outlet 17 for interception. The specific structure of the interception screen can be adjusted according to the actual situation.

[0033] Example 2

[0034] Its difference from Example 1 is that, as Figure 4 As shown, a piston rod 20 is installed in each oil storage chamber 14, and a drive mechanism is provided on the turntable 10. A hollow cavity 18 is provided in the center of the turntable 10. The drive mechanism includes a variable diameter plate 19, a fixed rod 12, and a spring 22, all of which are located within the hollow cavity 18. Figure 3 As shown, the third rotating shaft 9 is a tubular structure, and the fixing rod 12 is fitted inside the third rotating shaft 9. The fixing rod 12 passes through the turntable 10 and the third rotating shaft 9, and is rotatably connected to the turntable 10 and the third rotating shaft 9 respectively. The fixing rod 12 is fixedly connected to the side of the oil storage tank 8.

[0035] The fixed rod 12 passes through the variable diameter plate 19 and is fixedly connected to the variable diameter plate 19. The end of the piston rod 20 is fitted with a mounting plate 21 and welded to the mounting plate 21. The spring 22 is fitted on the piston rod 20, and the end of the spring 22 presses the mounting plate 21 and the inner wall of the hollow cavity 18 respectively. The end of the piston rod 20 pushes the arc surface of the variable diameter plate 19 under the pressure of the spring 22.

[0036] like Figure 4As shown, the variable diameter disk 19 consists of a first sector 23, a second sector 24, and a third sector 25. The first sector 23 has an equal radius. The radius of the second sector 24 gradually decreases relative to the radius of the first sector 23. The radius of the third sector 25 gradually increases relative to the minimum radius of the second sector 24 until it becomes equal to the radius of the first sector 23. The first sector 23 and the second sector 24 are located below the lower variable diameter disk 19 and are separated by the scraper 11. The first sector 23 has the largest radius and pushes the piston. The piston rod 20 blocks the oil inlet hole 15, preventing oil from entering the oil storage chamber 14 in the settling zone. The second sector 24 gradually shrinks in radius below the first sector 23, and under the action of the spring 22, it pushes the piston rod 20 to move, so that the oil storage chamber 14 sucks oil in the supernatant zone. The third sector 25 gradually increases in radius below the second sector 24 and is the same radius as the first sector 23, so that the piston rod 20 gradually squeezes out the oil in the oil storage chamber 14 and flows to the surface of the turntable 10, increasing the oil content on the surface of the turntable and improving the dust removal effect.

[0037] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A discharge device for a rotary drum dryer for metallurgical materials, characterized in that: The system includes a material guide hood (1), a flue gas passage (2), rollers (4), a first rotating shaft (5), a second rotating shaft (6), spiral blades (7), and a dust removal mechanism. The lower part of the material guide hood (1) is provided with a first discharge port (3). The flue gas passage (2) is U-shaped. The inlet of the flue gas passage (2) is horizontally connected to the first discharge port (3), and the outlet of the flue gas passage (2) is connected to the upper part of the material guide hood (1). The first rotating shaft (5) and the second rotating shaft (6) form an L-shaped structure. The structure is connected by bevel gear meshing transmission. The roller (4) is fixed on the first rotating shaft (5). The roller (4) is used for frictional rolling connection of the discharge port of the drum dryer. The spiral blade (7) is fixed on the second rotating shaft (6) and is located in the flue gas channel (2) together with the second rotating shaft (6). The inlet of the flue gas channel (2) is provided with a second discharge port (26) and a dust removal mechanism in sequence. The dust removal mechanism uses an oil film to adsorb the dust in the flue gas channel (2).

2. The discharge device for a rotary drum dryer for metallurgical materials according to claim 1, characterized in that: The dust removal mechanism includes an oil storage tank (8), a third rotating shaft (9), and a turntable (10). The first rotating shaft (5), the second rotating shaft (6), and the third rotating shaft (9) form a U-shape and are connected by bevel gear meshing. The third rotating shaft (9) is located above the oil storage tank (8). The turntable (10) is coaxially fixedly connected to the third rotating shaft (9). The turntable (10) is partially immersed in the oil storage tank (8).

3. The discharge device for a rotary drum dryer for metallurgical materials according to claim 2, characterized in that: A scraper (11) is provided in the oil storage tank (8). The scraper (11) is fixed and passes through the surface of the turntable (10). The scraper (11) divides the oil in the oil storage tank (8) into U-shapes.

4. The discharge device for a rotary drum dryer for metallurgical materials according to claim 3, characterized in that: There are multiple turntables (10), and multiple air passage holes (13) are provided on the turntables (10). The multiple turntables (10) are arranged to cut off the flue gas passage (2), and the air passage holes (13) on two adjacent turntables (10) are staggered.

5. The discharge device for a rotary drum dryer for metallurgical materials according to claim 4, characterized in that: The turntable (10) has multiple oil storage chambers (14) on its edge. The multiple oil storage chambers (14) are arranged in a ring-shaped interval. Each oil storage chamber (14) is provided with an oil inlet hole (15).

6. The discharge device for a rotary drum dryer for metallurgical materials according to claim 5, characterized in that: The oil storage chamber (14) is a rectangular parallelepiped structure. The oil storage chamber (14) is also provided with a first oil outlet (16) and a second oil outlet (17). The oil inlet (15) is located at the edge of the turntable (10). The first oil outlet (16) and the second oil outlet (17) are located close to the center of the turntable (10). The first oil outlet (16) and the second oil outlet (17) are located opposite each other at the corner of the oil storage chamber (14).

7. The discharge device for a rotary drum dryer for metallurgical materials according to claim 5, characterized in that: A piston rod (20) is provided in the oil storage chamber (14), and a drive mechanism is provided on the turntable (10). The drive mechanism is used to push the piston rod (20) to reciprocate in the oil storage chamber (14).

8. The discharge device for a rotary drum dryer for metallurgical materials according to claim 7, characterized in that: The turntable (10) has a hollow cavity (18) at its center. The driving mechanism includes a variable diameter disc (19), a fixed rod (12), and a spring (22), all of which are located in the hollow cavity (18). The third rotating shaft (9) is a tubular structure. The fixed rod (12) passes through the third rotating shaft (9). The fixed rod (12) passes through the turntable (10) and the third rotating shaft (9) and is rotatably connected to the turntable (10) and the third rotating shaft (9) respectively. The fixed rod (12) passes through the variable diameter disc (19) and is fixedly connected to the variable diameter disc (19). The piston rod (20) has a fixed plate (21) at its end. The spring (22) is fitted on the piston rod (20), and the end of the spring (22) presses the fixed plate (21) and the inner wall of the hollow cavity (18) respectively. The end of the piston rod (20) pushes against the arc surface of the variable diameter disc (19).

9. The discharge device for a rotary drum dryer for metallurgical materials according to claim 8, characterized in that: The variable diameter disk (19) includes a first sector (23), a second sector (24), and a third sector (25). The first sector (23) has the same radius, the second sector (24) has a radius that gradually decreases relative to the first sector (23), and the third sector (25) has a radius that gradually increases relative to the second sector (24). The first sector (23) and the second sector (24) are located below the variable diameter disk (19) and are separated by the scraper (11).

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