Wear-resistant lining of pulverized coal conveying pipeline of thermal power plant

Abstract

The utility model discloses a thermal power plant pulverized coal conveying pipeline wear-resistant lining, which relates to the technical field of pulverized coal transportation and comprises a protective pipeline, the protective pipeline comprises a pipeline body, and a lining pipeline is mounted in the pipeline body. A plurality of ceramic chips of the lining assembly are made of high-hardness aluminum oxide ceramics or silicon carbide ceramics, scouring of pulverized coal particles can be effectively resisted, meanwhile, the friction force between the pulverized coal particles and the surfaces of the ceramic chips can be reduced through a nanometer coating, the pulverized coal can be guided to move forwards uniformly through a plurality of flow guide protruding plates, scouring of the pulverized coal particles to the ceramic chips is more uniform, and the service life of the ceramic chips is prolonged. By arranging the elastic rubber layer and the buffer layer, energy generated by impact of pulverized coal particles can be absorbed, direct impact on the ceramic chip is reduced, thermal stress caused by factors such as temperature change is relieved, the buffer layer is of a honeycomb-shaped porous structure, and the honeycomb structure further absorbs impact energy and protects the ceramic chip.

Description

Technical Field

[0001] This utility model relates to the field of pulverized coal transportation technology, and in particular to a wear-resistant inner lining for pulverized coal conveying pipelines in thermal power plants. Background Technology

[0002] In thermal power plants, pulverized coal conveying pipelines are key equipment for transporting pulverized coal ground by coal mills to boilers for combustion. During the pulverized coal conveying process, the high-speed flowing pulverized coal particles continuously scour the inner wall of the pipeline, causing severe wear. As the usage time increases, the wear on the inner wall of the pipeline intensifies, which not only reduces the pipeline's conveying efficiency but may also cause safety problems such as pipeline leaks, increasing maintenance costs and downtime.

[0003] For example, Chinese patent CN221939530U discloses a pulverized coal conveying pipeline, including a corrugated pipe, two connecting pipes coaxially connected to both ends of the corrugated pipe by welding, a metal braided sheath sleeved on the outside of the corrugated pipe for protection, and a spiral wound pipe coaxially connected to the inner wall of the corrugated pipe, which is also connected to the flange by welding.

[0004] Currently, thermal power plants typically improve wear resistance by increasing pipe wall thickness, but this increases pipe weight and cost with limited effectiveness. Some plants also use traditional wear-resistant coatings, but these coatings are prone to peeling off under long-term erosion, making it difficult to meet the requirements of long-term stable operation of thermal power plants. To address these issues, a wear-resistant inner lining for pulverized coal conveying pipes in thermal power plants is proposed. Utility Model Content

[0005] The purpose of this utility model is to solve the problems existing in the prior art, and to propose a wear-resistant inner lining for pulverized coal conveying pipelines in thermal power plants.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a wear-resistant inner lining for a coal powder conveying pipeline in a thermal power plant, comprising a protective pipeline, the protective pipeline comprising a pipeline body, an inner lining pipeline installed inside the pipeline body, the inner lining pipeline comprising an elastic rubber layer and multiple interlocking inner lining components, two fixing rings symmetrically fixed to both ends of the elastic rubber layer, and multiple connecting plates fixed in a ring array on the inner edge of the elastic rubber layer, the two ends of the multiple connecting plates being respectively connected to the two fixing rings, multiple retaining rings uniformly fixed to the multiple connecting plates, and a honeycomb-shaped buffer layer fixed between adjacent connecting plates, the inner lining components being fixed between the multiple connecting plates, the inner lining components being composed of multiple ceramic pieces spliced ​​together, adjacent ceramic pieces being interlocked with each other, an assembly rod fixedly connected to one side of the ceramic piece, and a flow guiding protrusion fixedly connected to the other side of the ceramic piece, and a nano-coating being provided on the outer surface of the ceramic piece, and one end of the assembly rod being engaged with the retaining ring.

[0007] Preferably, the multiple guide protrusions in the liner assembly can be arranged in parallel.

[0008] Preferably, an adhesive layer is provided between the elastic rubber layer and the pipe body.

[0009] Preferably, the outer edge of the pipe body has a ring array of multiple through holes, and one end of the assembly rod extends through the through holes to the outside of the pipe body.

[0010] Preferably, the protective pipe also includes two sealing rings disposed on the pipe body. Both ends of the pipe body are provided with annular grooves. One end of the sealing ring is inserted into the annular groove, and the other end of the sealing ring is located at the connection between the pipe body and the fixing ring.

[0011] Preferably, both ends of the pipe body are provided with clamping flanges, and the outer edge of the clamping flange is connected with multiple bolts in an annular array of threads. The clamping flange is fixedly connected to the pipe body by the multiple bolts.

[0012] Preferably, the thickness of the buffer layer is 5 to 10 mm.

[0013] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0014] 1. In this utility model, the inner lining assembly is snapped onto the connecting plate by an assembly rod, and the inner lining assembly is composed of multiple ceramic pieces spliced ​​together, which facilitates the replacement of ceramic pieces and reduces the operating cost of the coal powder conveying pipeline. The multiple ceramic pieces of the inner lining assembly are made of high-hardness alumina ceramic or silicon carbide ceramic, which can effectively resist the scouring of coal powder particles. At the same time, the nano-coating on the surface of the ceramic pieces can reduce the friction between coal powder particles and the ceramic surface, reducing wear. In addition, by adding guide protrusions on the ceramic pieces, multiple guide protrusions can guide the coal powder to advance evenly, change the impact direction of the coal powder on the inner wall of the pipeline, make the scouring of the ceramic pieces by the coal powder particles more uniform, reduce local excessive wear, and at the same time, the uniform flow of coal powder can also reduce the relative velocity between the coal powder and the inner wall of the pipeline, further reducing wear.

[0015] 2. In this utility model, by setting an elastic rubber layer and a buffer layer, the elastic rubber layer is made of rubber material. Rubber has good elasticity and buffering performance, which can absorb the energy generated by the impact of coal powder particles, reduce the direct impact on the ceramic sheet, and at the same time alleviate the thermal stress caused by factors such as temperature changes. The buffer layer has a honeycomb porous structure to ensure that it has sufficient buffering effect. The honeycomb structure can further absorb impact energy and protect the ceramic sheet. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of a wear-resistant inner lining for a pulverized coal conveying pipeline in a thermal power plant, as proposed in this utility model.

[0017] Figure 2 This is a schematic diagram of the structure of a protective pipe with a wear-resistant inner lining for a coal powder conveying pipeline in a thermal power plant, as proposed in this utility model.

[0018] Figure 3 This is a schematic diagram of the structure of a wear-resistant inner lining pipe for a pulverized coal conveying pipeline in a thermal power plant, as proposed in this utility model.

[0019] Figure 4 This is a schematic diagram of the splicing structure of multiple lining components for a wear-resistant lining of a pulverized coal conveying pipeline in a thermal power plant, as proposed in this utility model.

[0020] Figure 5 This is a schematic diagram of the structure of a wear-resistant inner lining component for a pulverized coal conveying pipeline in a thermal power plant, as proposed in this utility model.

[0021] Figure 6 This is a front sectional view of a wear-resistant inner lining for a pulverized coal conveying pipeline in a thermal power plant, as proposed in this utility model.

[0022] Legend: 1. Protective pipe; 2. Lined pipe; 11. Pipe body; 12. Compression flange; 13. Bolt; 14. Through hole; 15. Annular groove; 16. Sealing ring; 21. Elastic rubber layer; 22. Retaining ring; 23. Connecting plate; 24. Lining assembly; 25. Snap ring; 26. Adhesive layer; 27. Buffer layer; 241. Ceramic sheet; 242. Guide plate; 243. Assembly rod; 244. Nano coating. Detailed Implementation

[0023] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0024] Many specific details are set forth in the following description in order 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. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0025] Example 1: As Figure 1 - Figure 6As shown, this utility model provides a wear-resistant inner lining for a pulverized coal conveying pipeline in a thermal power plant, including a protective pipeline 1. The protective pipeline 1 includes a pipeline body 11, and an inner lining pipeline 2 is installed inside the pipeline body 11. The inner lining pipeline 2 includes an elastic rubber layer 21 and multiple interconnected inner lining components 24. Two fixing rings 22 are symmetrically fixed to both ends of the elastic rubber layer 21, and multiple connecting plates 23 are fixed in a ring array on the inner edge of the elastic rubber layer 21. The two ends of the multiple connecting plates 23 are respectively connected to the two fixing rings 22. Multiple retaining rings 25 are uniformly fixed to the multiple connecting plates 23, and a honeycomb pattern is fixed between adjacent connecting plates 23. The buffer layer 27 and the inner lining assembly 24 are fixed between multiple connecting plates 23. The inner lining assembly 24 is composed of multiple ceramic pieces 241 spliced ​​together. Adjacent ceramic pieces 241 are interlocked with each other. An assembly rod 243 is fixedly connected to one side of the ceramic piece 241, and a flow guiding protrusion 242 is fixedly connected to the other side of the ceramic piece 241. A nano-coating 244 is provided on the outer surface of the ceramic piece 241. One end of the assembly rod 243 is engaged with a retaining ring 25. The multiple flow guiding protrusions 242 in the inner lining assembly 24 can be arranged in parallel. An adhesive layer 26 is provided between the elastic rubber layer 21 and the pipe body 11. The thickness of the buffer layer 27 is 5-10 mm.

[0026] The specific settings and functions of this embodiment are described below: The conveyed coal powder comes into contact with the innermost lining component 24. The multiple ceramic plates 241 of the lining component 24 are made of high-hardness alumina ceramic or silicon carbide ceramic. These ceramic materials have the characteristics of high hardness and good wear resistance, which can effectively resist the scouring of coal powder particles. At the same time, a nano-coating 244 is also provided on the surface of the ceramic plate 241. The nano-coating 244 has extremely low surface roughness, which can reduce the friction between coal powder particles and the ceramic surface and reduce wear. At the same time, the nano-coating 244 also has good chemical stability and corrosion resistance, which can prevent the ceramic surface from being corroded by chemicals in the coal powder. In addition, by adding guide protrusions 242 to the ceramic plate 241, when the coal powder flows in the inner lining pipe 2, the multiple guide protrusions 242 will guide the coal powder to move forward evenly, change the impact direction of the coal powder on the inner wall of the pipe, make the scouring of the ceramic plate 241 by the coal powder particles more uniform, reduce local excessive wear, and at the same time, the uniform flow of coal powder can also reduce the relative velocity between the coal powder and the inner wall of the pipe, further reducing wear.

[0027] By setting an elastic rubber layer 21 and adding multiple buffer layers 27 with a thickness of 5-10mm between adjacent connecting plates 23, the elastic rubber layer 21 is made of rubber material. Rubber has good elasticity and buffering performance, which can absorb the energy generated by the impact of coal powder particles, reduce the direct impact on the ceramic sheet 241, and also alleviate the thermal stress caused by factors such as temperature changes. The buffer layer 27 has a honeycomb porous structure to ensure that it has sufficient buffering effect. The honeycomb structure can further absorb impact energy and protect the ceramic sheet 241. The adhesive layer 26 firmly bonds the elastic rubber layer 21 to the inner wall of the pipe body 11, ensuring that the elastic rubber layer 21 is tightly bonded to the pipe body 11, thereby improving the overall stability and reliability of the inner lining pipe 2.

[0028] Example 2: Figure 1 - Figure 5 As shown, the outer edge of the pipe body 11 has a ring array of through holes 14. One end of the assembly rod 243 extends through the through holes 14 to the outside of the pipe body 11. The protective pipe 1 also includes two sealing rings 16 disposed on the pipe body 11. Both ends of the pipe body 11 are provided with annular grooves 15. One end of the sealing ring 16 is inserted into the annular groove 15, and the other end of the sealing ring 16 is located at the connection between the pipe body 11 and the fixing ring 22. Both ends of the pipe body 11 are provided with clamping flanges 12. The outer edge of the clamping flange 12 is threaded with multiple bolts 13. The clamping flange 12 is fixedly connected to the pipe body 11 by multiple bolts 13.

[0029] The overall effect of this embodiment is that by adding an inner lining pipe 2 inside the protective pipe 1, the inner lining pipe 2 is composed of a multi-layer structure, mainly consisting of an elastic rubber layer 21 and multiple spliced ​​inner lining components 24. The inner lining components 24 are snapped onto the retaining rings 25 of the connecting plate 23 by multiple assembly rods 243, and the inner lining components 24 are spliced ​​together by multiple ceramic pieces 241. Adjacent ceramic pieces 241 can be interlocked with each other through a dovetail groove structure. This structure not only enhances the connection strength between the ceramic pieces 241, but also prevents the ceramic pieces 241 from shifting or falling off under the scouring of coal powder; and when some ceramic pieces 241 are partially displaced... When the ceramic plate 241 needs to be replaced due to long-term wear, the assembly rod 243 can be pressed to remove it without replacing the entire conveying pipeline, thus reducing the operating cost of the pulverized coal conveying pipeline. At both ends of the pipeline body 11, there are also sealing structures, including sealing rings 16 and clamping flanges 12. The sealing rings 16 are made of high-temperature resistant and wear-resistant rubber material and are installed in the annular grooves 15 at the ends of the pipeline body 11. The clamping flanges 12 are connected to the pipeline body 11 by bolts 13, which can press the sealing rings 16 to prevent pulverized coal from leaking at the pipeline connection and ensure the sealing and stability of pulverized coal conveying.

[0030] The method of use and working principle of this device: The inner lining component 24 is snapped onto the retaining ring 25 of the connecting plate 23 by multiple assembly rods 243, and the inner lining component 24 is spliced ​​together by multiple ceramic pieces 241. Adjacent ceramic pieces 241 can be interlocked with each other through a dovetail groove structure. This structure can not only enhance the connection strength between ceramic pieces 241, but also prevent the ceramic pieces 241 from shifting or falling off under the flushing of coal powder, and facilitate the removal of ceramic pieces 241, thereby reducing the use cost of coal powder conveying pipeline;

[0031] The conveyed coal powder comes into contact with the innermost lining component 24. The multiple ceramic plates 241 of the lining component 24 are made of high-hardness alumina ceramic or silicon carbide ceramic, which can effectively resist the scouring of coal powder particles. At the same time, the nano-coating 244 can reduce the friction between coal powder particles and ceramic surface. In addition, when the coal powder flows in the lining pipe 2, multiple guide protrusions 242 will guide the coal powder to move forward evenly, so that the scouring of the ceramic plates 241 by the coal powder particles is more uniform and local excessive wear is reduced.

[0032] By setting an elastic rubber layer 21 and a buffer layer 27, the elastic rubber layer 21 is made of rubber material. Rubber has good elasticity and buffering performance, which can absorb the energy generated by the impact of coal powder particles, reduce the direct impact on the ceramic sheet 241, and at the same time alleviate the thermal stress caused by factors such as temperature changes. The buffer layer 27 has a honeycomb porous structure to ensure that it has sufficient buffering effect. The honeycomb structure can further absorb impact energy and protect the ceramic sheet 241.

[0033] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A wear-resistant lining for a pulverized coal conveying pipeline of a thermal power plant, comprising a protective pipeline (1) comprising a pipeline body (11), characterized in that: The pipeline body (11) is internally provided with a lining pipeline (2), the lining pipeline (2) comprises an elastic rubber layer (21) and a plurality of lining assemblies (24) which are mutually spliced, two fixed rings (22) are symmetrically and fixedly connected at two ends of the elastic rubber layer (21), a plurality of connecting plates (23) are fixedly arranged in an annular array at an inner edge of the elastic rubber layer (21), two ends of the plurality of connecting plates (23) are connected with the two fixed rings (22) respectively, a plurality of clamping rings (25) are fixedly connected on the plurality of connecting plates (23) uniformly, a honeycomb-shaped buffer layer (27) is fixed between adjacent connecting plates (23), the lining assembly (24) is fixed between the plurality of connecting plates (23), the lining assembly (24) is spliced by a plurality of ceramic sheets (241), adjacent ceramic sheets (241) are mutually embedded, an assembling rod (243) is fixedly connected to one side of the ceramic sheet (241), a flow guide lug (242) is fixedly connected to the other side of the ceramic sheet (241), and a nano coating (244) is arranged on an outer surface of the ceramic sheet (241), and one end of the assembling rod (243) is clamped with the clamping ring (25).

2. The abrasion resistant lining for coal conveying pipelines in thermal power plants according to claim 1, characterized in that: The plurality of flow guide lugs (242) in the lining assembly (24) can be arranged in parallel.

3. The abrasion resistant lining for coal conveying pipes in thermal power plants according to claim 1, characterized in that: A bonding layer (26) is arranged between the elastic rubber layer (21) and the pipeline body (11).

4. The abrasion resistant lining for coal conveying pipes in thermal power plants according to claim 1, characterized in that: A plurality of through holes (14) are arranged in an annular array at an outer edge of the pipeline body (11), and one end of the assembling rod (243) extends to an outer side of the pipeline body (11) through the through hole (14).

5. The abrasion resistant lining for coal conveying pipes in thermal power plants according to claim 1, characterized in that: The protective pipeline (1) further comprises two sealing rings (16) arranged at the pipeline body (11), annular grooves (15) are arranged at two ends of the pipeline body (11), one end of the sealing ring (16) is inserted into the annular groove (15), and the other end of the sealing ring (16) is located at a connection position of the pipeline body (11) and the fixed ring (22).

6. The wear resistant lining for coal conveying pipes in thermal power plants according to claim 5, characterized in that: The pipeline body (11) is provided with a pressing flange (12) at each end, a plurality of bolts (13) are threadedly connected in an annular array at an outer edge of the pressing flange (12), and the pressing flange (12) is fixedly connected with the pipeline body (11) through the plurality of bolts (13).

7. The abrasion resistant lining for coal conveying pipes in thermal power plants according to claim 1, characterized in that: The thickness of the buffer layer (27) is 5-10 mm.

Images