Powder cooling and transferring device for rotary kiln
By employing technologies such as labyrinth sealing structures, silicon carbide coatings, and cooling water coils, the problem of easy wear of the gas collection hood of the rotary kiln cooler has been solved, achieving stable negative pressure and continuous production of the rotary kiln, and reducing environmental pollution and workload.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHAANXI NONFERROUS YULIN NEW MATERIAL GRP CO LTD
- Filing Date
- 2025-05-20
- Publication Date
- 2026-05-12
AI Technical Summary
The existing rotary kiln cooler's gas collection hood is easily worn by the powder, resulting in high air leakage rate and large negative pressure fluctuations, which affect the stability and continuous production of the rotary kiln. In addition, the high-temperature powder transfer process causes environmental pollution and high labor intensity for personnel.
Employing technologies such as labyrinth seal structure, silicon carbide coating, and cooling water coil, combined with K-type thermocouples and level gauges, it achieves fully enclosed, low-energy powder transfer. The labyrinth seal structure prevents gas leakage, the silicon carbide coating reduces wear, the cooling water coil lowers the temperature, the electric slide gate valve achieves a fully enclosed state, and the K-type thermocouples and level gauges provide real-time control.
It effectively reduces negative pressure fluctuations inside the cooler, reduces wear, controls material temperature within the range of 60℃-100℃, extends the service life of the screw conveyor, reduces environmental pollution, and lowers workload.
Smart Images
Figure CN224230651U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of powder transfer equipment, and relates to a powder cooling and transfer device for rotary kilns. Background Technology
[0002] In existing technology, the rotary kiln cooler is used to cool the calcined coke. To ensure the negative pressure during rotary kiln operation, a gas collection hood is installed 8 meters above the cooler body, with a powder discharge port below it. The traditional gas collection hood sealing structure is easily worn under the scouring of powder at 200℃-300℃, resulting in an air leakage rate as high as 5%-8% and a negative pressure fluctuation range of ±50Pa. This severely affects the stability of the rotary kiln's feeding. During production, 1.2-1.5 tons of powder need to be manually transferred each shift, and the operating environment temperature is above 60℃ with a dust concentration exceeding [a certain value]. The material concentration is 20 mg / m³. Furthermore, the feed pipe is blocked up to 3 times per shift due to thermal stress deformation. The maintenance time accounts for as much as 15% of the production time. During each discharge process, the high temperature and large particle size of the material cause wear and tear on the cover, allowing air to enter the cooler. This seriously affects the maintenance of negative pressure and the stable feed rate of the rotary kiln, making it difficult to maintain the continuous and stable operation of the rotary kiln and cooler. In addition, each powder collection and transfer process causes some pollution to the surrounding environment, greatly increasing the workload of the staff.
[0003] In summary, there is an urgent need for a fully enclosed, low-energy-consumption, and highly reliable powder transfer device to achieve stable negative pressure and continuous, safe, and stable production in rotary kilns. Utility Model Content
[0004] The purpose of this invention is to provide a powder cooling and transfer device for rotary kilns, which solves the problem in the prior art where the gas collection hood on the cooler body is easily worn by the powder.
[0005] The technical solution adopted by this utility model is a powder cooling and transfer device for rotary kilns, including a cooler, a gas collecting hood is fitted on the cooler body, a labyrinth sealing structure is provided between the cooler and the gas collecting hood, a hopper is fixedly connected to the bottom of the gas collecting hood, a K-type thermocouple and a level gauge are installed inside the hopper, an ash discharge port is provided at the bottom of the hopper, a first screw conveyor is connected to the ash discharge port, and a second screw conveyor is connected to the first screw conveyor.
[0006] The features of this utility model for powder cooling and conveying device in rotary kilns are also as follows:
[0007] The labyrinth sealing structure includes several stationary rings, which are fixed along the axial direction of the gas collection hood inside the gas collection hood and through which the cooler passes; it also includes several rotating rings, which are sleeved and fixed along the axial direction of the cooler outside the cooler. The number of rotating rings and stationary rings are the same and their positions correspond one-to-one. Several sealing teeth are staggered on the corresponding sides of the rotating rings and stationary rings. The surfaces of the rotating rings, stationary rings, and sealing teeth are all coated with a second silicon carbide coating.
[0008] The inner wall of the hopper is coated with a first silicon carbide coating.
[0009] Cooling water coils are spirally wound on the outer wall of the hopper.
[0010] The ash discharge port is square in shape with a side length of 300mm-350mm, and an electric slide valve is installed at the bottom of the ash discharge port.
[0011] The first and second spiral conveyors are vertically connected.
[0012] The measuring probe of a K-type thermocouple is externally welded with a steel pipe.
[0013] The first screw conveyor is 2.5m-3.5m long, and the second screw conveyor is 12m-14m long. The second screw conveyor is connected to a discharge elbow. The angle between the second screw conveyor and the discharge elbow is not less than 60°, and the radius of curvature of the discharge elbow is not less than 1.5 times the inner diameter of the second screw conveyor.
[0014] The spacing between the cooling water coils is 100mm-150mm.
[0015] The thickness of the first silicon carbide coating is 1mm-2mm.
[0016] The beneficial effects of this utility model are:
[0017] This utility model relates to a powder cooling and conveying device for rotary kilns. By incorporating a labyrinth seal structure, it effectively prevents external air from entering the cooler through the gas collection hood during operation, thus reducing negative pressure fluctuations and imbalances within the cooler. This ensures the temperature of the discharged material is controlled between 60℃ and 100℃, thereby increasing the service life of the screw conveyor and reducing wear on the gas collection hood caused by powder scouring. An electric slide gate valve keeps the entire hopper fully enclosed during operation. Cooling water flowing through the cooling water coil cools the material in the hopper. A silicon carbide coating reduces the scouring and wear of the hopper and labyrinth seal structure by high-temperature materials. K-type thermocouples and level gauges transmit measurement data to the PLC controller in real time for interlocking control. Attached Figure Description
[0018] Figure 1This is a cross-sectional view of the cooler, gas collecting hood, and hopper in this utility model;
[0019] Figure 2 This is a structural diagram of the labyrinth sealing structure in this utility model;
[0020] Figure 3 This is a structural diagram of the hopper, the first screw conveyor, and the second screw conveyor in this utility model;
[0021] Figure 4 This is a structural diagram of the cooling water coil in this utility model.
[0022] In the diagram, 1. Hopper, 11. K-type thermocouple, 12. Electric slide gate valve, 13. First silicon carbide coating, 14. Ash discharge port, 15. Level gauge, 2. Labyrinth seal structure, 21. Stationary ring, 22. Moving ring, 23. Second silicon carbide coating, 24. Sealing teeth, 3. Cooler, 4. Gas collection hood, 5. Cooling water coil, 6. First screw conveyor, 7. Second screw conveyor, 8. Discharge elbow. Detailed Implementation
[0023] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.
[0024] For powder cooling and conveying devices used in rotary kilns, refer to Figure 1 The system includes a cooler 3, a gas collection hood 4 mounted on the body of the cooler 3, a labyrinth sealing structure 2 between the cooler 3 and the gas collection hood 4, a hopper 1 fixedly connected to the bottom of the gas collection hood 4, a K-type thermocouple 11 and a level gauge 15 installed inside the hopper 1, an ash discharge port 14 at the bottom of the hopper 1, a first screw conveyor 6 connected to the ash discharge port 14, and a second screw conveyor 7 connected to the first screw conveyor 6. The hopper 1 is made of Q235 steel plate and has a volume of 2m³-2.5m³.
[0025] The labyrinth sealing structure 2 includes several stationary rings 21, which are fixed along the axial direction of the gas collecting hood 4 inside the hood 4, with the cooler 3 passing through each stationary ring 21; it also includes several moving rings 22, which are sleeved and fixed along the axial direction of the cooler 3 outside the cooler 3. The number of moving rings 22 and stationary rings 21 are the same, and their positions correspond one-to-one. (Refer to...) Figure 2 The rotating ring 22 and the stationary ring 21 are provided with a number of sealing teeth 24 on their corresponding sides. The surfaces of the rotating ring 22, the stationary ring 21 and the sealing teeth 24 are all coated with a second silicon carbide coating 23. The rotating ring 22, the stationary ring 21 and the sealing teeth 24 are all made of Q235B steel.
[0026] Reference Figure 3 The inner wall of hopper 1 is provided with a first silicon carbide coating 13, as shown in the figure. Figure 4A cooling water coil 5 is spirally wound on the outer wall of hopper 1. The cooling water coil 5 is connected to circulating cooling water (flow rate 3m³ / h - 5m³ / h, inlet water temperature 25℃-30℃), as shown in the reference. Figure 1 The ash discharge port 14 is square in shape with a side length of 300mm-350mm, as shown in the reference. Figure 3 An electric slide gate valve 12 is installed at the bottom of the ash discharge port 14. The function of the electric slide gate valve 12 is to keep the entire hopper 1 in a fully enclosed state during operation, so that the material can be cooled in the hopper 1 to reach the discharge temperature and control the discharge amount. The first screw conveyor 6 and the second screw conveyor 7 are vertically connected. The first screw conveyor 6 is installed in a direction perpendicular to the cooler 3, and the second screw conveyor 7 is installed in the extension direction of the rotary kiln. The measuring probe of the K-type thermocouple 11 is welded with a steel pipe. The steel pipe can prevent the measuring probe from being eroded and worn when the material is dropped. The measuring range of the K-type thermocouple 11 is 0℃-500℃.
[0027] The first screw conveyor 6 is 2.5m-3.5m long, has a power of 4kW, and adopts a variable pitch design (200mm pitch at one end near the hopper 1 and 150mm pitch at the other end), with a processing capacity of 8t / h; the second screw conveyor 7 is 12m-14m long, has a power of 7.5kW, and a response time of no more than 0.5s; the second screw conveyor 7 is connected to a discharge elbow 8, the angle between the second screw conveyor 7 and the discharge elbow 8 is not less than 60°, the radius of curvature of the discharge elbow 8 is not less than 1.5 times the inner shaft diameter of the second screw conveyor 7, the pipe spacing of the cooling water coil 5 is 100mm-150mm, and the thickness of the first silicon carbide coating 13 is 1mm-2mm.
[0028] During operation, the material at the kiln head of the cooler 3 moves towards the tail. After passing through the gas collecting hood 4, the material falls into the hopper 1. The labyrinth seal structure 2 can prevent gas and powder from leaking axially or radially inside the cooler 3, while also preventing external impurities from entering. The K-type thermocouple 11, level gauge 15, electric slide gate valve 12, first screw conveyor 6, and second screw conveyor 7 are respectively connected to the PLC controller. The K-type thermocouple 11 and level gauge 15 upload the measurement data to the PLC controller in real time. When the measured temperature reaches 60℃ and the material accumulation height reaches 75%, the PLC controller can start the two screw conveyors and the electric slide gate valve 12, adjusting the speed of the two screw conveyors to 20r / min-40r / min to transport the material to the electronic belt scale. When the material level is below 10%, the two screw conveyors and the electric slide gate valve 12 stop working, thereby realizing interlock control.
[0029] Example 1:
[0030] The powder cooling and transfer device for rotary kiln includes a cooler 3, a gas collecting hood 4 is fitted on the body of the cooler 3, a labyrinth sealing structure 2 is provided between the cooler 3 and the gas collecting hood 4, a hopper 1 is fixedly connected to the bottom of the gas collecting hood 4, a K-type thermocouple 11 and a level gauge 15 are installed inside the hopper 1, an ash discharge port 14 is provided at the bottom of the hopper 1, a first screw conveyor 6 is connected to the ash discharge port 14, and a second screw conveyor 7 is connected to the first screw conveyor 6.
[0031] Cooling water coils 5 are spirally wound on the outer wall of hopper 1.
[0032] The ash discharge port 14 is square in shape with a side length of 300mm, and an electric slide valve 12 is installed at the bottom of the ash discharge port 14.
[0033] The first screw conveyor 6 is 2.5m long, the second screw conveyor 7 is 12m long, the second screw conveyor 7 is connected to a discharge elbow 8, the included angle between the second screw conveyor 7 and the discharge elbow 8 is not less than 60°, and the radius of curvature of the discharge elbow 8 is not less than 1.5 times the inner diameter of the second screw conveyor 7.
[0034] The spacing between the cooling water coils 5 is 100mm.
[0035] Example 2:
[0036] The powder cooling and transfer device for rotary kiln includes a cooler 3, a gas collecting hood 4 is fitted on the body of the cooler 3, a labyrinth sealing structure 2 is provided between the cooler 3 and the gas collecting hood 4, a hopper 1 is fixedly connected to the bottom of the gas collecting hood 4, a K-type thermocouple 11 and a level gauge 15 are installed inside the hopper 1, an ash discharge port 14 is provided at the bottom of the hopper 1, a first screw conveyor 6 is connected to the ash discharge port 14, and a second screw conveyor 7 is connected to the first screw conveyor 6.
[0037] The inner wall of the hopper 1 is provided with a first silicon carbide coating 13.
[0038] The labyrinth sealing structure 2 includes several stationary rings 21, which are fixed along the axial direction of the gas collecting hood 4 inside the gas collecting hood 4 and the cooler 3 passes through each stationary ring 21; it also includes several moving rings 22, which are sleeved and fixed along the axial direction of the cooler 3 outside the cooler 3. The number of moving rings 22 and stationary rings 21 are the same and their positions correspond one-to-one. Several sealing teeth 24 are alternately arranged on the side of the moving rings 22 and the stationary rings 21 corresponding to each other. The surfaces of the moving rings 22, the stationary rings 21 and the sealing teeth 24 are all coated with a second silicon carbide coating 23.
[0039] The ash discharge port 14 is square in shape with a side length of 325mm, and an electric slide valve 12 is installed at the bottom of the ash discharge port 14.
[0040] The first spiral conveyor 6 and the second spiral conveyor 7 are vertically connected.
[0041] Example 3:
[0042] The powder cooling and transfer device for rotary kiln includes a cooler 3, a gas collecting hood 4 is fitted on the body of the cooler 3, a labyrinth sealing structure 2 is provided between the cooler 3 and the gas collecting hood 4, a hopper 1 is fixedly connected to the bottom of the gas collecting hood 4, a K-type thermocouple 11 and a level gauge 15 are installed inside the hopper 1, an ash discharge port 14 is provided at the bottom of the hopper 1, a first screw conveyor 6 is connected to the ash discharge port 14, and a second screw conveyor 7 is connected to the first screw conveyor 6.
[0043] The labyrinth sealing structure 2 includes several stationary rings 21, which are fixed along the axial direction of the gas collecting hood 4 inside the gas collecting hood 4 and the cooler 3 passes through each stationary ring 21; it also includes several moving rings 22, which are sleeved and fixed along the axial direction of the cooler 3 outside the cooler 3. The number of moving rings 22 and stationary rings 21 are the same and their positions correspond one-to-one. Several sealing teeth 24 are alternately arranged on the side of the moving rings 22 and the stationary rings 21 corresponding to each other. The surfaces of the moving rings 22, the stationary rings 21 and the sealing teeth 24 are all coated with a second silicon carbide coating 23.
[0044] The inner wall of the hopper 1 is provided with a first silicon carbide coating 13.
[0045] Cooling water coils 5 are spirally wound on the outer wall of hopper 1.
[0046] The ash discharge port 14 is square in shape with a side length of 350mm, and an electric slide valve 12 is installed at the bottom of the ash discharge port 14.
[0047] The first screw conveyor 6 is 3m long, the second screw conveyor 7 is 13m long, the second screw conveyor 7 is connected to a discharge elbow 8, the included angle between the second screw conveyor 7 and the discharge elbow 8 is not less than 60°, and the radius of curvature of the discharge elbow 8 is not less than 1.5 times the inner diameter of the second screw conveyor 7.
[0048] The thickness of the first silicon carbide coating 13 is 1 mm.
[0049] Example 4:
[0050] The powder cooling and transfer device for rotary kiln includes a cooler 3, a gas collecting hood 4 is fitted on the body of the cooler 3, a labyrinth sealing structure 2 is provided between the cooler 3 and the gas collecting hood 4, a hopper 1 is fixedly connected to the bottom of the gas collecting hood 4, a K-type thermocouple 11 and a level gauge 15 are installed inside the hopper 1, an ash discharge port 14 is provided at the bottom of the hopper 1, a first screw conveyor 6 is connected to the ash discharge port 14, and a second screw conveyor 7 is connected to the first screw conveyor 6.
[0051] The labyrinth sealing structure 2 includes several stationary rings 21, which are fixed along the axial direction of the gas collecting hood 4 inside the gas collecting hood 4 and the cooler 3 passes through each stationary ring 21; it also includes several moving rings 22, which are sleeved and fixed along the axial direction of the cooler 3 outside the cooler 3. The number of moving rings 22 and stationary rings 21 are the same and their positions correspond one-to-one. Several sealing teeth 24 are alternately arranged on the side of the moving rings 22 and the stationary rings 21 corresponding to each other. The surfaces of the moving rings 22, the stationary rings 21 and the sealing teeth 24 are all coated with a second silicon carbide coating 23.
[0052] The inner wall of the hopper 1 is provided with a first silicon carbide coating 13.
[0053] Cooling water coils 5 are spirally wound on the outer wall of hopper 1.
[0054] The first screw conveyor 6 is 3.5m long, the second screw conveyor 7 is 14m long, the second screw conveyor 7 is connected to a discharge elbow 8, the included angle between the second screw conveyor 7 and the discharge elbow 8 is not less than 60°, and the radius of curvature of the discharge elbow 8 is not less than 1.5 times the inner diameter of the second screw conveyor 7.
[0055] The spacing between the cooling water coils 5 is 125mm.
[0056] Example 5:
[0057] The powder cooling and transfer device for rotary kiln includes a cooler 3, a gas collecting hood 4 is fitted on the body of the cooler 3, a labyrinth sealing structure 2 is provided between the cooler 3 and the gas collecting hood 4, a hopper 1 is fixedly connected to the bottom of the gas collecting hood 4, a K-type thermocouple 11 and a level gauge 15 are installed inside the hopper 1, an ash discharge port 14 is provided at the bottom of the hopper 1, a first screw conveyor 6 is connected to the ash discharge port 14, and a second screw conveyor 7 is connected to the first screw conveyor 6.
[0058] The labyrinth sealing structure 2 includes several stationary rings 21, which are fixed along the axial direction of the gas collecting hood 4 inside the gas collecting hood 4 and the cooler 3 passes through each stationary ring 21; it also includes several moving rings 22, which are sleeved and fixed along the axial direction of the cooler 3 outside the cooler 3. The number of moving rings 22 and stationary rings 21 are the same and their positions correspond one-to-one. Several sealing teeth 24 are alternately arranged on the side of the moving rings 22 and the stationary rings 21 corresponding to each other. The surfaces of the moving rings 22, the stationary rings 21 and the sealing teeth 24 are all coated with a second silicon carbide coating 23.
[0059] The inner wall of the hopper 1 is provided with a first silicon carbide coating 13.
[0060] Cooling water coils 5 are spirally wound on the outer wall of hopper 1.
[0061] The thickness of the first silicon carbide coating 13 is 1.5 mm.
[0062] Example 6:
[0063] The powder cooling and transfer device for rotary kiln includes a cooler 3, a gas collecting hood 4 is fitted on the body of the cooler 3, a labyrinth sealing structure 2 is provided between the cooler 3 and the gas collecting hood 4, a hopper 1 is fixedly connected to the bottom of the gas collecting hood 4, a K-type thermocouple 11 and a level gauge 15 are installed inside the hopper 1, an ash discharge port 14 is provided at the bottom of the hopper 1, a first screw conveyor 6 is connected to the ash discharge port 14, and a second screw conveyor 7 is connected to the first screw conveyor 6.
[0064] The inner wall of the hopper 1 is provided with a first silicon carbide coating 13.
[0065] Cooling water coils 5 are spirally wound on the outer wall of hopper 1.
[0066] The spacing between the cooling water coils 5 is 150mm.
[0067] The thickness of the first silicon carbide coating 13 is 2 mm.
Claims
1. A powder cooling and conveying device for a rotary kiln, characterized in that, The system includes a cooler (3), on which a gas collecting hood (4) is fitted. A labyrinth sealing structure (2) is provided between the cooler (3) and the gas collecting hood (4). A hopper (1) is fixedly connected to the bottom of the gas collecting hood (4). A K-type thermocouple (11) and a level gauge (15) are installed inside the hopper (1). A ash discharge port (14) is provided at the bottom of the hopper (1). A first screw conveyor (6) is connected to the ash discharge port (14). A second screw conveyor (7) is connected to the first screw conveyor (6).
2. The powder cooling and conveying device for a rotary kiln according to claim 1, characterized in that, The labyrinth sealing structure (2) includes several stationary rings (21), which are fixed along the axial direction of the gas collecting hood (4) inside the gas collecting hood (4) and the cooler (3) passes through each stationary ring (21); it also includes several moving rings (22), which are sleeved and fixed along the axial direction of the cooler (3) outside the cooler (3). The number of moving rings (22) and stationary rings (21) are the same and their positions correspond one-to-one. Several sealing teeth (24) are alternately arranged on the side of the moving rings (22) and the stationary rings (21). The surfaces of the moving rings (22), the stationary rings (21) and the sealing teeth (24) are all coated with a second silicon carbide coating (23).
3. The powder cooling and conveying device for a rotary kiln according to claim 1, characterized in that, The inner wall of the hopper (1) is provided with a first silicon carbide coating (13).
4. The powder cooling and conveying device for a rotary kiln according to claim 1, characterized in that, Cooling water coils (5) are spirally wound on the outer wall of the hopper (1).
5. The powder cooling and conveying device for a rotary kiln according to claim 1, characterized in that, The ash discharge port (14) is square in shape with a side length of 300mm-350mm, and an electric slide valve (12) is provided at the bottom of the ash discharge port (14).
6. The powder cooling and conveying device for a rotary kiln according to claim 1, characterized in that, The first screw conveyor (6) and the second screw conveyor (7) are vertically connected.
7. The powder cooling and conveying device for a rotary kiln according to claim 1, characterized in that, The measuring probe of the K-type thermocouple (11) is externally welded with a steel pipe.
8. The powder cooling and conveying device for a rotary kiln according to any one of claims 1-7, characterized in that, The first screw conveyor (6) has a length of 2.5m-3.5m, the second screw conveyor (7) has a length of 12m-14m, the second screw conveyor (7) is connected to a discharge elbow (8), the angle between the second screw conveyor (7) and the discharge elbow (8) is not less than 60°, and the radius of curvature of the discharge elbow (8) is not less than 1.5 times the inner diameter of the second screw conveyor (7).
9. The powder cooling and conveying device for a rotary kiln according to claim 4, characterized in that, The spacing between the cooling water coils (5) is 100mm-150mm.
10. The powder cooling and conveying device for a rotary kiln according to claim 3, characterized in that, The thickness of the first silicon carbide coating (13) is 1mm-2mm.