Rotary kiln for burning rare earth products with high efficiency and energy saving

Abstract

A kind of high-efficiency energy-saving rotary kiln for burning rare earth products, comprising: roller, feeding mechanism, characterized by: the feeding mechanism outlet end is connected with roller, the roller is supported on three groups of riding wheel group by front and rear three gears, is equipped with stop wheel limit, roller outer wall is inlaid transmission gear ring by reduction motor and pinion drive near feeding end riding wheel group, the roller is respectively provided with feeding end cover and discharge end cover, the feeding end cover and the discharge end cover are sealed between roller with static seal.This application material is turned over in rotary kiln with rotary kiln rotation, is beneficial to burning decomposition, burns evenly, burning temperature also needs to be lower, burning efficiency is high;Rotary kiln adopts feeding end and discharge end sealing structure, heat loss is less, greatly reduces energy saving.

Description

Technical Field

[0001] This invention belongs to the field of rotary kiln technology, specifically relating to a high-efficiency and energy-saving rotary kiln for calcining rare earth products. Background Technology

[0002] Rotary kilns are among the most effective equipment for hazardous waste treatment, achieving the harmlessness of waste through complete and efficient combustion. Roasting is a process that induces physical and chemical changes in the minerals within the raw materials under specific atmosphere and temperatures below their melting points. The specific chemical changes occurring during roasting depend on the atmospheric conditions and the target components.

[0003] Rotary kilns often suffer from poor sealing, leading to significant and uncontrollable air leakage into the furnace. This affects the stability of oxygen content and temperature within the kiln, resulting in excessive oxygen combustion and unstable combustion. Currently available rotary kiln sealing methods are ineffective, inconvenient to install and disassemble, and impractical.

[0004] Meanwhile, the roasted powder is usually at a high temperature, requiring a cooling kiln and a conveying pump for cooling and transportation. In the existing technology, the cooling kiln is a simple rotary kiln without insulation bricks. It relies on the iron kiln body of the rotary kiln for heat dissipation, which has poor heat dissipation effect and high working temperature. At the same time, the powder is generally conveyed by lifting buckets, which occupy a large area, have a short conveying distance, and are prone to failure, difficult to repair, and have a long repair time. In addition, powder is prone to leakage during the lifting process, which affects the continuity of production. Summary of the Invention

[0005] The above-mentioned objective of this invention is achieved through the following technical solution: A high-efficiency and energy-saving rotary kiln for calcining rare earth products, comprising: a drum and a feeding mechanism, characterized in that: the outlet end of the feeding mechanism is connected to a drum, the drum is supported on three sets of support rollers by three front and rear roller rings, and a stop roller is provided for limiting; a large transmission gear ring is embedded in the outer wall of the drum near the support roller set at the feeding end, driven by a reduction motor and a pinion; a feeding end cover and a discharging end cover are respectively provided at the front and rear of the drum, and the feeding end cover and the discharging end cover are dynamically and statically sealed with the drum; a combustion system is installed inside the drum, the combustion system including a gas burner and a burner extension pipe; and a sealed cooling kiln is connected to the rear end of the discharging end cover.

[0006] Preferably, the feeding mechanism includes a hopper, a mixing chamber is installed inside the hopper, a screw feeder is installed outside the hopper, and the hopper is fixed to the ground by a steel support.

[0007] Preferably, the dynamic and static seal is a labyrinth seal with multiple packing compression. The dynamic and static seal includes a labyrinth dynamic ring and a labyrinth static ring. The labyrinth static ring is fixed to the feeding end cover and the discharging end cover. The labyrinth static ring is fixed to the roller. The outer periphery of the labyrinth static ring is filled with sealing packing.

[0008] The sealed cooling kiln includes: a base, a drive device, and a cooling conveying device. The base is a cuboid structure with a sloping top surface. A left support block and a right support block are provided on the base. A cooling inlet is fixedly installed on the right support block, and a conveying outlet is fixedly installed on the left support block. The base is also evenly distributed with drive devices, and the cooling conveying device is rotatably mounted on the drive device.

[0009] Preferably, the cooling conveying device has a fixed rod inside, one end of which is fixed to the cooling inlet. The fixed rod also has irregularly shaped blocks at its upper and lower ends. The cooling conveying device includes a cylindrical outer shell. A fixed ring is located inside the left end of the outer shell. Elastic conveying plates are evenly connected to the right end of the fixed ring. The elastic conveying plates are fixed along one side around the fixed ring. A support bar and a left baffle are located on the left side of the elastic conveying plate, and a right baffle is located on the right end. A waterproof cloth is placed between the elastic conveying plates. The left and right baffles and the waterproof cloth form a sealed space. The support bar can support the shape of the waterproof cloth within the sealed space. A compression spring is located on the right end of the elastic conveying plate and is fixed relative to the outer shell. Two layers of flexible waterproof cloth are also placed between the elastic conveying plate and the outer shell at both ends. The flexible waterproof cloth, the elastic conveying plate, and the outer shell form a sealed waterproof space, which can be filled with water for water cooling.

[0010] Preferably, the other end of the fixing rod is connected and fixed to the fixing rod of the adjacent cooling conveying device, the leftmost cooling conveying device is rotatably connected to the conveying output port, and the rightmost cooling conveying device is rotatably connected to the cooling conveying device.

[0011] Preferably, the irregularly shaped block has an elliptical structure and is in contact with the right end of the elastic conveyor sheet.

[0012] Preferably, the driving mechanism includes a base, which is respectively disposed at both ends of the cooling conveying device. A driving wheel is disposed on the base, and a rotating gear ring is disposed above the driving wheel. The driving wheel drives the rotating gear ring to rotate. The rotating gear ring is fixed to the left end of the cooling conveying device. The driving mechanism is driven by a motor.

[0013] Preferably, the cooling inlet includes a powder inlet, and a fan is installed inside the cooling inlet to create a negative pressure inside the cooling inlet. The conveying outlet is provided with a flip cover, and the flip cover can be rotated and fixed on the conveying outlet by a rotating rod inside.

[0014] In summary, the present invention has at least one of the following beneficial technical effects:

[0015] In this invention, the material is tumbled inside the rotary kiln as the kiln rotates, which is beneficial for calcination and decomposition, resulting in uniform calcination and requiring a lower calcination temperature, thus achieving high calcination efficiency. The rotary kiln adopts a sealed structure at both the feeding and discharging ends, minimizing heat loss and significantly reducing energy consumption.

[0016] This invention, through the design of a cooling conveying device, utilizes the rotational cooperation of an elastic conveying plate and a shaped block to simultaneously turn and tumble the calcined powder, allowing the powder to have more contact with air and accelerating the cooling efficiency.

[0017] This invention, through the design of a sealed and waterproof space between the outer shell and the elastic conveyor plates, enables effective cooling with only a small amount of coolant. Simultaneously, the reduced coolant volume minimizes pressure within the outer shell, significantly extending the equipment's lifespan and enhancing its safety. Furthermore, the sealed space between the elastic conveyor plates separates the powder while simultaneously filling the sealed space with coolant, thus cooling the powder internally and accelerating the cooling rate. Additionally, the use of irregularly shaped blocks allows for rapid replacement of the coolant within the sealed space, maintaining optimal cooling performance at all times. Attached Figure Description

[0018] Figure 1 This is an overall schematic diagram of the rotary kiln of the present invention;

[0019] Figure 2 This is a cross-sectional schematic diagram of the sealing method of the present invention;

[0020] Figure 3 This is an overall schematic diagram of the high-efficiency cooling kiln of the present invention;

[0021] Figure 4 This is a schematic cross-sectional view of the high-efficiency cooling kiln of the present invention;

[0022] Figure 5 This is a three-dimensional schematic diagram of the cooling transfer device of the present invention;

[0023] Figure 6 This is a schematic diagram of the cooling transfer device of the present invention;

[0024] Figure 7 This is a cross-sectional schematic diagram of the cooling transfer device of the present invention;

[0025] In the diagram: 1. Base, 2. Left support block, 3. Right support block, 4. Cooling inlet, 401. Powder inlet, 5. Conveying outlet, 501. Flip cover, 6. Drive unit, 601. Base, 602. Drive wheel, 603. Rotating gear ring, 7. Cooling conveying device, 701. Fixing rod, 702. Irregular block, 703. Shell, 704. Fixing ring, 705. Flexible waterproof cloth, 8. Elastic conveying sheet, 801. Support bar, 802. Left baffle, 803. Right baffle, 804. Waterproof cloth, 805. Compression spring, 9. Roller, 10. Feeding mechanism, 11. Feeding end cover, 12. Discharge end cover, 1301. Labyrinth moving ring, 1302. Labyrinth stationary ring, 1303. Sealing filler. Detailed Implementation

[0026] The above-mentioned objective of this invention is achieved through the following technical solution: A high-efficiency and energy-saving rotary kiln for calcining rare earth products, comprising: a drum 9 and a feeding mechanism 10, characterized in that: the outlet end of the feeding mechanism is connected to the drum 9, the drum 9 is supported on three sets of support rollers by three front and rear roller rings, and is equipped with a stop roller for limiting; a large transmission gear ring is embedded in the outer wall of the drum near the support roller set at the feeding end, driven by a reduction motor and a small gear; a feeding end cover 11 and a discharging end cover 12 are respectively provided at the front and rear of the drum 9, and the feeding end cover 11 and the discharging end cover 12 are dynamically and statically sealed with the drum 9; a combustion system is installed inside the drum 9, the combustion system includes a gas burner and a burner extension pipe; and a sealed cooling kiln is connected to the rear end of the discharging end cover.

[0027] Specifically, the feeding mechanism 10 includes a hopper 1001, a mixing chamber is installed inside the hopper 1001, a screw feeder is installed outside the hopper 1001, and the hopper 1001 is fixed to the ground by a steel support 1002.

[0028] Specifically, the dynamic and static seal is a labyrinth seal with multiple packing compression. The dynamic and static seal includes a labyrinth dynamic ring 1301 and a labyrinth static ring 1302. The labyrinth static ring 1302 is fixed on the feeding end cover 11 and the discharging end cover 12. The labyrinth static ring 1302 is fixed on the roller 9. The labyrinth static ring 1302 is filled with sealing packing 1303 on its outer periphery.

[0029] Specifically, the sealed cooling kiln includes a base 1, a drive device 6, and a cooling conveying device 7. The base 1 is a cuboid structure with a sloping top surface. A left support block 2 and a right support block 3 are provided on the base 1. A cooling inlet 4 is fixedly installed on the right support block 3, and a conveying outlet 5 is fixedly installed on the left support block 2. The base 1 is also evenly provided with drive devices 6, and the cooling conveying device 7 is rotatably mounted on the drive device 6.

[0030] Specifically, the cooling conveying device 7 has a fixing rod 701 inside, one end of which is fixed to the cooling inlet 4. The fixing rod 701 also has irregularly shaped blocks 702 at its upper and lower ends. The cooling conveying device 7 includes a cylindrical outer shell 703. A fixing ring 704 is provided inside the left end of the outer shell 703. Elastic conveying plates 8 are evenly connected to the right end of the fixing ring 704. The elastic conveying plates 8 are fixed on one side around the fixing ring 704. A support bar 801 and a left baffle 802 are provided on the left side of the elastic conveying plate 8, and a right baffle 803 is provided on the right end of the elastic conveying plate 8. A waterproof cloth 804 is provided between the elastic conveyor plates 8. The left baffle 802, the right baffle 803, and the waterproof cloth 804 form a sealed space. The support bar 801 can support the shape of the waterproof cloth 804 inside the sealed space. A compression spring 805 is provided at the right end of the elastic conveyor plate 8 and is fixed relative to the outer shell 703. Two layers of flexible waterproof cloth 705 are also provided at the left and right ends between the elastic conveyor plate 8 and the outer shell 703. The flexible waterproof cloth 705, the elastic conveyor plate 8, and the outer shell 703 form a sealed waterproof space. Water can be injected into the sealed waterproof space for water cooling.

[0031] Specifically, the other end of the fixing rod 701 is connected and fixed to the fixing rod 701 of the adjacent cooling conveying device, the leftmost cooling conveying device 7 is rotatably connected to the conveying output port 5, and the rightmost cooling conveying device 7 is rotatably connected to the cooling conveying device 7.

[0032] Specifically, the irregular block 702 has an elliptical structure and is in contact with the right end of the elastic conveying piece 8.

[0033] Specifically, the drive mechanism 6 includes a base 601, which is respectively disposed at both ends of the cooling conveying device 7. A drive wheel 602 is disposed on the base 601, and a rotating gear ring 603 is disposed above the drive wheel 602. The drive wheel 602 drives the rotating gear ring 603 to rotate. The rotating gear ring 603 is fixed to the left end of the cooling conveying device 7. The drive mechanism 6 is driven by a motor.

[0034] Specifically, the cooling inlet 4 includes a powder inlet 401, and a fan is also provided inside the cooling inlet 4 to create a negative pressure inside the cooling inlet 4. The conveying outlet 5 is provided with a flip cover 501, and the flip cover 501 can be rotated and fixed on the conveying outlet by a rotating rod.

[0035] The rotary kiln is fed continuously through a feeding device. The material is turned over inside the kiln as it rotates. The material is then conveyed directly to the next process via pneumatic conveying.

[0036] When the cooling kiln starts working, the motor is powered on, which drives the rotating gear ring 603 to rotate through the drive wheel 602. The rotating gear ring 603 drives the cooling conveying device 7 to rotate. At the same time, a certain amount of coolant is injected into the sealed and waterproof space, so that a water-cooled layer is formed between the outer shell 703 and the elastic conveying plate 8.

[0037] The coolant only needs to be filled to 1 / 3 of its capacity. More coolant means higher pressure and requires more power to rotate the motor. This method only requires a small amount of coolant to achieve the desired cooling effect, saving energy and improving cooling efficiency.

[0038] Then, the powder inlet is opened and the exhaust fan is turned on to keep the inside of the cooling inlet 401 under negative pressure. This ensures that the powder will not overflow into the external environment. After the roasted powder enters the cooling conveying device 7, the rotating gear ring 603 drives the outer shell 703 to rotate. At this time, the powder falls into the elastic conveying plate 8. The waterproof cloth 804 and the support strip 801 partially separate the powder. The powder rotates along with the rotation of the elastic conveying plate 8.

[0039] At this time, due to the setting of the fixed rod 701, the irregular blocks 702 at its upper and lower ends contact the elastic conveying plate 8. During rotation, the different positions of the elastic conveying plate 8 have different pressure relationships with the irregular blocks 702. At this time, the elastic conveying plates 8 at the upper and lower ends extend outward under the action of the irregular blocks 702. Due to the deformation of the elastic conveying plate 8, the left baffle 802 and the right baffle 803, which should match left and right, are misaligned. Since the lower elastic conveying plate 8 is in the water coolant, the coolant enters the sealed space through the misaligned space. Since the shape of the support bar 801 can be inserted into the dust, the dust can be cooled. After the elastic conveying plate 8 filled with coolant is separated from the action of the irregular blocks 702 under the action of rotation, it quickly bounces back to its original position under the action of the compression spring 805. At this time, the powder on this elastic conveying plate 8 will also bounce up and scatter, which can further turn the powder and accelerate the cooling reaction rate.

[0040] When the elastic conveyor plate 8 rotates to the top, the coolant in the sealed space is cooled by the powder, resulting in a higher temperature and poorer cooling effect. The upper shaped block 702 acts on the elastic conveyor plate 8, and the left baffle 802 and right baffle 803 are opened again. Since the elastic conveyor plate 8 is not in the coolant at this time, the coolant in the sealed space flows out through the opened space and re-enters the sealed waterproof space. Then, the elastic conveyor plate 8 is bounced and vibrated to clean off some of the powder. At the same time, the cooling conveyor device 7 is placed at a certain angle, which can accelerate the cooling and transportation of the powder. After the elastic conveyor plate 8 rotates to the bottom shaped block 702, new coolant is poured in to ensure the cooling quality.

[0041] Then, as it rotates, the baking powder is conveyed to the conveyor outlet, flows out through the flip cover, and enters the next process.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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 high-efficiency and energy-saving rotary kiln for calcining rare earth products, comprising: The roller (9) and the feeding mechanism (10) are characterized in that: the outlet end of the feeding mechanism is connected to the roller (9), the roller (9) is supported on three sets of support rollers by three front and rear roller rings, and a stop roller is provided for limiting. A large transmission gear ring is embedded in the outer wall of the roller near the feeding end support roller group and is driven by a reduction motor and a small gear. The roller (9) is provided with a feeding end cover (11) and a discharge end cover (12) at the front and rear respectively. The feeding end cover (11) and the discharge end cover (12) are dynamically and statically sealed with the roller (9). The roller (9) is equipped with a combustion system, which includes a gas burner and a burner extension pipe. The rear end of the discharge end cover is connected to a sealed cooling kiln. The feeding mechanism (10) includes a hopper (1001), a mixing chamber is installed inside the hopper (1001), a screw feeder is installed outside the hopper (1001), and the hopper (1001) is fixed to the ground by a steel bracket (1002); The dynamic and static seal is a labyrinth seal with multiple packings. The dynamic and static seal includes a labyrinth dynamic ring (1301) and a labyrinth static ring (1302). The labyrinth static ring (1302) is fixed on the feeding end cover (11) and the discharging end cover (12). The labyrinth static ring (1302) is fixed on the roller (9). The labyrinth static ring (1302) is filled with sealing packing (1303) on its outer periphery. The sealed cooling kiln includes a base (1), a drive device (6), and a cooling conveying device (7). The base (1) is a cuboid structure with a sloping top surface. A left support block (2) and a right support block (3) are provided on the base (1). A cooling inlet (4) is fixedly installed on the right support block (3), and a conveying outlet (5) is fixedly installed on the left support block (2). The base (1) is also evenly provided with drive devices (6), and the cooling conveying device (7) is rotatably installed on the drive device (6). The cooling conveying device (7) is equipped with a fixing rod (701) inside. One end of the fixing rod (701) is fixed to the cooling inlet (4). The upper and lower ends of the fixing rod (701) are also equipped with irregular blocks (702). The cooling conveying device (7) includes a cylindrical shell (703). A fixing ring (704) is provided inside the left end of the shell (703). An elastic conveying plate (8) is evenly connected to the right end of the fixing ring (704). The elastic conveying plate (8) is fixed on one side around the fixing ring (704). A support bar (801) and a left baffle (802) are provided on the left side of the elastic conveying plate (8). A right baffle (803) is provided on the right end of the elastic conveying plate (8). A waterproof cloth (804) is provided between the elastic conveyor plates (8). The left baffle (802), the right baffle (803), and the waterproof cloth (804) form a sealed space. The support bar (801) can support the shape of the waterproof cloth (804) inside the sealed space. A compression spring (805) is provided at the right end of the elastic conveyor plate (8) and is fixed relative to the outer shell (703). Two layers of flexible waterproof cloth (705) are also provided between the elastic conveyor plate (8) and the outer shell (703). A sealed waterproof space is formed between the flexible waterproof cloth (705), the elastic conveyor plate (8), and the outer shell (703). Water can be injected into the sealed waterproof space for water cooling.

2. The rotary kiln for calcining rare earth products according to claim 1, characterized in that: The other end of the fixed rod (701) is connected and fixed to the fixed rod (701) of the adjacent cooling conveying device. The leftmost cooling conveying device (7) is rotatably connected to the conveying output port (5), and the rightmost cooling conveying device (7) is rotatably connected to the cooling conveying device (7).

3. The rotary kiln for calcining rare earth products according to claim 1, characterized in that: The irregular block (702) has an elliptical structure and is in contact with the right end of the elastic conveying piece (8).

4. The rotary kiln for calcining rare earth products according to claim 1, characterized in that: The driving device (6) includes a base (601), which is respectively disposed at both ends of the cooling conveying device (7). A driving wheel (602) is disposed on the base (601), and a rotating gear ring (603) is disposed above the driving wheel (602). The driving wheel (602) drives the rotating gear ring (603) to rotate. The rotating gear ring (603) is fixed to the left end of the cooling conveying device (7). The driving device (6) is driven by a motor.

5. The rotary kiln for calcining rare earth products according to claim 1, characterized in that: The cooling inlet (4) includes a powder inlet (401), and a fan is also provided inside the cooling inlet (4) to create a negative pressure inside the cooling inlet (4). The conveying outlet (5) is provided with a flip cover (501), and the flip cover (501) can be rotated and fixed on the conveying outlet by a rotating rod.

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