Pipeline leakage point plugging structure and plugging method and application thereof

Abstract

The invention belongs to the technical field of leakage point plugging, and particularly relates to a pipeline leakage point plugging structure and a plugging method and application thereof. A pipeline leakage point blocking structure sequentially comprises a filling layer, a wear-resistant protective layer and a reinforcing layer from bottom to top, wherein the filling layer is blocked on a pipeline leakage point. The filling layer is formed by filling a pipeline leakage point gap with an asbestos cord and a sodium silicate solution; the wear-resistant protective layer is formed by covering the filling layer with ceramic particles; and the reinforcing layer is formed by covering the filling layer with glass wool cloth and a sodium silicate solution, pressurizing and curing.

Description

Technical Field

[0001] The present invention belongs to the technical field of leak plugging, and particularly relates to a pipeline leak plugging structure, a plugging method and an application thereof. Background Art

[0002] The boiler combustion system of modern coal-fired power plants needs to transport pulverized coal prepared by coal mills to the combustion chamber in a high-speed flow manner to ensure combustion efficiency and stable energy supply. Due to the characteristics of pulverized coal such as small particle size, large surface area, flammable and explosive, extremely harsh requirements are put forward for the wear resistance and sealing performance of the powder feeding pipeline. Once cracks or holes appear in the pipeline, pulverized coal will leak out under the carrying of high-speed air flow. This will not only possibly form a large amount of accumulated powder around the pipeline, increasing the difficulty of cleaning and maintenance, but also cause waste of pulverized coal and a decrease in combustion efficiency. At the same time, if pulverized coal mixes with air excessively during the leakage process, there is a potential risk of deflagration and explosion, seriously endangering the safe operation of the boiler system and surrounding equipment.

[0003] In order to address the many hidden dangers brought by pulverized coal leakage, the industry often adopts various temporary plugging methods to quickly resume production. More common means include external covering with metal sheets or heat-resistant patches, or "plastering" sealing with tapes, sealants, etc. Although these methods can block powder leakage to a certain extent in the short term, they often cannot withstand the long-term high-speed pulverized coal scouring and high-temperature environment: the plugging materials often age, crack or fall off at high temperatures, and if the sealed parts are subjected to repeated fluctuations in temperature and pressure, they are also extremely prone to secondary loosening. As a result, the unit needs to be shut down and overhauled frequently, not only increasing the operation and maintenance costs, but also significantly shortening the actual service life of the components and indirectly affecting the overall power generation efficiency.

[0004] In the existing plugging processes, there is a lack of a solution that can take into account high-temperature tolerance, wear and erosion resistance, and long-term stability. Specifically, traditional materials mostly focus on initial capping and do not form a multi-layer composite protection, making it difficult to effectively resist the scouring of pulverized coal flow inside the pipeline; single adhesives or temporary patch means also cannot withstand the thermal expansion and contraction and pipeline vibration during boiler operation for a long time. Further, the existing technology lacks an effective systematic guidance on how to achieve high-strength sealing in narrow spaces or curved pipeline parts, and often can only rely on the experience of on-site workers and temporary means. Therefore, how to provide a more durable and stable sealing structure under high-temperature and high-scouring conditions and reduce the additional costs and safety risks brought by later maintenance has become a key technical problem to be solved urgently. Summary of the Invention

[0005] The purpose of the present invention is to solve the above deficiencies and provide a pipeline leak plugging structure, a plugging method and an application thereof.

[0006] First aspect, a pipeline leak point plugging structure, adopts the following technical solution:

[0007] A pipeline leak point plugging structure, the structure sequentially includes a filling layer, a wear-resistant protective layer and a reinforcing layer from bottom to top, which are plugged on the pipeline leak point; the filling layer is formed by filling asbestos rope and sodium silicate solution at the gap of the pipeline leak point; the wear-resistant protective layer is formed by covering the filling layer with ceramic particles; the reinforcing layer is formed by covering the filling layer with fiberglass cloth and sodium silicate solution and curing under pressure.

[0008] Further, the thickness of the filling layer is 40mm - 60mm; the thickness of the wear-resistant protective layer is 40mm - 60mm; the thickness of the reinforcing layer is 3mm - 8mm.

[0009] Further, the concentration of the sodium silicate solution is 30wt% - 38wt%.

[0010] Further, the particle size of the ceramic particles is 1.5mm - 2.5mm.

[0011] Further, the ceramic particles are selected from one or more of alumina, zirconia, silicon carbide, boron carbide, and mullite.

[0012] Further, the ceramic particles are alumina.

[0013] Second aspect, a method for plugging pipeline leak points, adopts the following technical solution:

[0014] A method for plugging pipeline leak points, forming the plugging structure at the pipeline leak point, includes the following processes:

[0015] Clean the impurities around the pipeline leak point and ensure the pipeline surface is dry;

[0016] After mixing sodium silicate solution and asbestos rope, tightly fill it at the pipeline leak point to form a filling layer;

[0017] Cover ceramic particles outside the filling layer and carry out compaction treatment to form a wear-resistant protective layer;

[0018] Fully immerse the fiberglass cloth in sodium silicate solution and then wrap it on the outer surface of the wear-resistant protective layer and fix it under pressure to form a reinforcing layer.

[0019] Further, the pressure for fixing under pressure is 0.1MPa - 0.3MPa.

[0020] Third aspect, an application of a pipeline leak point plugging structure, adopts the following technical solution:

[0021] An application of a pipeline leak point plugging structure, the plugging structure is applied to the leak point of a pulverized coal pipeline.

[0022] Furthermore, the flow velocity of the pulverized coal transported through the pulverized coal pipeline is 10 m / s to 30 m / s, and the transportation temperature range is 30 °C to 70 °C.

[0023] Advantages of the present invention:

[0024] A pipeline leak point plugging structure provided by the present invention is composed of a filling layer, a wear-resistant protective layer, and a reinforcing layer stacked in sequence from bottom to top. The filling layer is composed of sodium silicate solution and asbestos rope, which can firmly penetrate into the gaps of the pipeline leak point, and has certain adhesiveness and high-temperature resistance. Therefore, it can initially block the contact channel between high-speed pulverized coal and air, effectively alleviating the problems of easy detachment and poor adhesion of the traditional single-layer patch method, and at the same time reducing the risk of deflagration or explosion caused by pulverized coal leakage; the middle wear-resistant protective layer uses ceramic particles to cover the filling layer and compacts it, thereby forming a "hard shell" at the plugging part, significantly improving the adaptability to high-speed pulverized coal erosion and high-temperature environment. Compared with only using flexible materials or adhesives, ceramic particles can withstand large temperature gradients and fluid pressure fluctuations in the boiler system for a long time, extending the service life of the plugging part; the outermost layer is coated with fiberglass cloth fully soaked in sodium silicate solution and then pressurized and cured, which not only binds the inner layer and the middle layer as a whole, but also further improves the overall sealing performance and structural strength through the adhesive strength formed after the sodium silicate solution is cured. This multi-layer plugging structure can avoid the phenomenon of frequent detachment of the traditional patching method due to thermal expansion and contraction or mechanical shock under the working conditions of high temperature, high wear intensity, and frequent vibration, thereby significantly reducing the number of shutdowns for maintenance and related operating costs. Description of the drawings

[0025] Figure 1 It is a schematic diagram of the plugging structure provided by the present invention.

[0026] Reference numerals: 1, plugging structure; 10, filling layer; 20, wear-resistant protective layer; 30, reinforcing layer. Specific embodiments

[0027] The following further specifically describes a pipeline leak point plugging structure, its plugging method, and application according to the present invention in combination with embodiments. For the sake of simplicity of description, this document cannot list all alternative technical features and implementation schemes included in the present invention. Therefore, those skilled in the art should know that any technical feature and implementation scheme in this embodiment do not limit the protection scope of the present invention, and this protection scope includes any alternative technical features and implementation schemes that those skilled in the art can adopt without creative labor. Specifically, any implementation scheme obtained by replacing any technical feature in the present invention or combining any two or more technical features provided by the present invention should be within the protection scope of the present invention.

[0028] In this embodiment, as Figure 1 shown, at the pipe leak point, first clean and dry the pipe surface to make it free of loose impurities and accumulated powder. Subsequently, in the leak point gap area, mix the pre-prepared sodium silicate solution (such as a sodium silicate solution with a concentration of 36 wt%) with asbestos rope and then fill it. If necessary, a small compaction tool or scraper can be used to ensure that the filling layer fits tightly against the pipe wall and effectively covers the leak point. After the construction of the filling layer is completed, immediately lay ceramic particles evenly on its outer side and compact them by means of a roller or manual tapping to form a wear-resistant protective layer. If the on-site pipe shape is irregular or there are local structural protrusions such as elbows and supports, the laying angle and filling thickness of the ceramic particles (within the range of 40 mm to 60 mm) can be flexibly adjusted to obtain a better fit.

[0029] In an alternative embodiment, the particle size of the ceramic particles can be selected from 1.5 mm to 2.5 mm, which can not only ensure erosion resistance but also maintain a good fit between the filling layer and the pipe. At the same time, the ceramic particles are not limited to alumina, and one or more of zirconia, silicon carbide, boron carbide, and mullite can also be selected; in a more preferred case, alumina particles can be directly used to exert their comprehensive performance in high temperature resistance and impact resistance. If it is desired to further improve the long-term stability of the composite layer in a high-temperature environment, the material ratio of the ceramic particles can be adjusted according to the pulverized coal flow rate and temperature conditions.

[0030] After the above-mentioned wear-resistant protective layer is laid, soak the fiberglass cloth thoroughly in a sodium silicate solution (for example, in a concentration range of 35 wt% to 37 wt%, and preferably 36 wt%) so that the fiber pores of the fiberglass cloth are penetrated and wetted by the sodium silicate solution. Subsequently, tightly wind or attach the soaked fiberglass cloth to the surface of the wear-resistant protective layer. To prevent voids and bulges from appearing between layers, a certain pressure (such as 0.1 MPa to 0.3 MPa) can be applied appropriately during the winding process. After multiple turns of wrapping and allowing the fiberglass cloth to fully adhere to the wear-resistant protective layer, fix it by continuous pressurization or using a bundling band, and finally cure naturally to form the reinforcement layer. The thickness of the formed reinforcement layer can generally be selected within the range of 3 mm to 8 mm, such as specific values of 3 mm, 5 mm, or 8 mm, mainly depending on the outer diameter of the on-site pipe and the pulverized coal erosion intensity.

[0031] In terms of thickness adjustment, the values of the filling layer (40 mm - 60 mm), wear-resistant protection layer (40 mm - 60 mm), and reinforcement layer (3 mm - 8 mm) can be flexibly selected according to different working conditions. For example, when the pipeline temperature is high and the flow rate is faster, the thickness of the wear-resistant protection layer can be appropriately increased to enhance its erosion resistance; if the on-site space is narrow or the leakage point range is relatively small, a thinner layer thickness can be selected to achieve the effect of balancing the plugging efficiency and structural compactness. Any value within the above thickness range can meet the plugging requirements of this embodiment, so no further elaboration is needed.

[0032] Embodiment

[0033] Embodiment 1

[0034] Embodiment 1 provides a pipeline leakage point plugging structure as follows: A filling layer, a wear-resistant protection layer, and a reinforcement layer are successively formed from bottom to top at the pipeline leakage point. Specifically, the filling layer has a thickness of 50 mm and is formed by filling the gap of the pipeline leakage point with a mixture of asbestos rope and 36 wt% sodium silicate solution; the wear-resistant protection layer has a thickness of 40 mm and is formed by covering the outer surface of the filling layer with alumina ceramic particles with a particle size of about 2 mm and compacting them; the reinforcement layer has a thickness of 3 mm and is formed by fully soaking a fiberglass cloth in 36 wt% sodium silicate solution and then covering the outside of the wear-resistant protection layer and curing it under pressure.

[0035] On this basis, Embodiment 1 also provides a pipeline leakage point plugging method, including the following steps:

[0036] Thoroughly clean the accumulated powder and impurities around the pipeline leakage point to ensure that the pipe wall surface is dry and there are no loose particles;

[0037] After mixing asbestos rope with 36 wt% sodium silicate solution, tightly fill the gap of the pipeline leakage point to form a filling layer with a thickness of about 50 mm;

[0038] Uniformly lay alumina ceramic particles (with a particle size of about 2 mm) on the outside of the filling layer and compact them to form a wear-resistant protection layer with a thickness of about 40 mm;

[0039] Fully soak a fiberglass cloth in 36 wt% sodium silicate solution, then cover the surface of the wear-resistant protection layer, and apply a pressure of about 0.3 MPa for fixation to cure it into a reinforcement layer with a thickness of about 3 mm.

[0040] Embodiment 2

[0041] The difference between the pipeline leakage point plugging structure and its plugging method provided by Embodiment 2 and Embodiment 1 is that for the filling layer: the thickness is 40 mm, and it is formed by tightly filling the pipeline leakage point with a mixture of 30 wt% sodium silicate solution and asbestos rope; for the wear-resistant protection layer: the thickness is 40 mm, and alumina ceramic particles with a particle size of about 1.5 mm are selected Evenly cover the filling layer and compact it; Reinforcement layer: with a thickness of 3 mm. After fully soaking the fiberglass cloth in a 30 wt% sodium silicate solution, it is wrapped around the outer surface of the wear-resistant protective layer and cured under a pressure of 0.1 MPa to form a shape.

[0042] Example 3

[0043] The pipeline leak point plugging structure and its plugging method provided in Example 3 are different from those in Example 1 in that the filling layer: with a thickness of 50 mm, the leak point is filled with a mixture of 36 wt% sodium silicate solution and asbestos rope; Wear-resistant protective layer: with a thickness of 55 mm, alumina ceramic particles with a particle size of about 2.0 mm are evenly laid and compacted; Reinforcement layer: with a thickness of 5 mm. After the fiberglass cloth is fully soaked in a 36 wt% sodium silicate solution, it is wrapped around the surface of the wear-resistant protective layer and fixed into a shape under a pressure of 0.2 MPa.

[0044] Example 4

[0045] The pipeline leak point plugging structure and its plugging method provided in Example 4 are different from those in Example 1 in that the filling layer: with a thickness of 60 mm, the pipeline leak point is filled with a mixture of 38 wt% sodium silicate solution and asbestos rope to provide higher initial viscosity and bonding strength; Wear-resistant protective layer: with a thickness of 60 mm, zirconia is selected as the ceramic particles with a particle size of about 2.5 mm, and it is compacted after covering the filling layer; Reinforcement layer: with a thickness of 8 mm. The fiberglass cloth is soaked in a 38 wt% sodium silicate solution and pressurized at 0.3 MPa to cure the outer layer.

[0046] Example 5

[0047] The pipeline leak point plugging structure and its plugging method provided in Example 5 are different from those in Example 1 in that the filling layer: with a thickness of 40 mm, it is filled with a mixture of 35 wt% sodium silicate solution and asbestos rope; Wear-resistant protective layer: with a thickness of 60 mm, the ceramic particles can be a mixture of silicon carbide (SiC) and mullite in a certain proportion, with a particle size of about 2.0 mm; Reinforcement layer: with a thickness of 3 mm. After the fiberglass cloth is fully soaked in a 35 wt% sodium silicate solution, it is wound around the outer layer and cured under a pressure condition of 0.1 MPa.

[0048] Example 6

[0049] The pipeline leak point plugging structure and its plugging method provided in Example 6 are different from those in Example 1 in that the filling layer: with a thickness of 50 mm, the leak point is filled with a mixture of 36 wt% sodium silicate solution and asbestos rope; Wear-resistant protective layer: with a thickness of 50 mm, the ceramic particles are boron carbide The particle size is about 1.5 mm, and after being mixed with alumina at a mass ratio of 2:8, it is laid and compacted; Reinforcement layer: with a thickness of 8 mm, after the fiberglass cloth is infiltrated in a 36 wt% sodium silicate solution, it is solidified and formed under a pressure of 0.2 MPa.

[0050] Comparative example

[0051] Comparative example 1

[0052] The difference between a pipeline leak point plugging structure and its plugging method provided by Comparative Example 1 and Example 4 is that the particle size of the zirconia ceramic particles is 1.2 mm.

[0053] Comparative example 2

[0054] The difference between a pipeline leak point plugging structure and its plugging method provided by Comparative Example 2 and Example 4 is that the particle size of the zirconia ceramic particles is 2.8 mm.

[0055] Comparative example 3

[0056] The difference between a pipeline leak point plugging structure and its plugging method provided by Comparative Example 3 and Example 4 is that the thickness of the filling layer is 35 mm.

[0057] Comparative example 4

[0058] The difference between a pipeline leak point plugging structure and its plugging method provided by Comparative Example 4 and Example 4 is that the thickness of the filling layer is 65 mm.

[0059] Comparative example 5

[0060] The difference between a pipeline leak point plugging structure and its plugging method provided by Comparative Example 5 and Example 4 is that the thickness of the wear-resistant protective layer is 37 mm.

[0061] Comparative example 6

[0062] The difference between a pipeline leak point plugging structure and its plugging method provided by Comparative Example 6 and Example 4 is that the thickness of the wear-resistant protective layer is 68 mm.

[0063] Comparative example 7

[0064] The difference between a pipeline leak point plugging structure and its plugging method provided by Comparative Example 7 and Example 4 is that the thickness of the reinforcement layer is 2.5 mm.

[0065] Comparative example 8

[0066] The difference between a pipeline leak point plugging structure and its plugging method provided by Comparative Example 8 and Example 4 is that the thickness of the reinforcement layer is 9 mm.

[0067] Comparative example 9

[0068] The difference between a pipeline leak point plugging structure and its plugging method provided by Comparative Example 9 and those of Example 4 lies in that no wear-resistant protective layer is provided, and it only includes a filling layer and a reinforcing layer that are the same as those of Example 4.

[0069] Comparative Example 10

[0070] The difference between a pipeline leak point plugging structure and its plugging method provided by Comparative Example 10 and those of Example 4 lies in that no filling layer and wear-resistant protective layer are provided, and it only includes a reinforcing layer that is the same as that of Example 4.

[0071] Comparative Example 11

[0072] The difference between a pipeline leak point plugging structure and its plugging method provided by Comparative Example 11 and those of Example 4 lies in that the original sodium silicate solution with a concentration of 38 wt% is replaced with an epoxy resin solution with a concentration of 40 wt%, and the same number of layers, thickness, and other parameters are the same as those of Example 4.

[0073] Comparative Example 12

[0074] The difference between a pipeline leak point plugging structure and its plugging method provided by Comparative Example 12 and those of Example 4 lies in that after the fiberglass cloth is soaked in the solution, it is only air-dried and cured naturally without applying a pressure of 0.3 MPa for fixation.

[0075] Application Example

[0076] The plugging structures provided in Examples 1 to 6 and Comparative Examples 1 to 12 are applied to the leak points of the pulverized coal transportation pipeline, where the pulverized coal flow rate in the pulverized coal pipeline is 10 m / s to 30 m / s, and the conveying temperature is 30 °C to 70 °C.

[0077] Test Example

[0078] Referring to the implementation manners of Examples 1 to 6 and Comparative Examples 1 to 12, the filling layer of asbestos rope and sodium silicate solution, the ceramic particle wear-resistant layer, and the fiberglass cloth reinforcing layer impregnated with sodium silicate solution are stacked and cured according to the set thickness and then cut into appropriate sizes, and the interfacial bonding state between the sample and the actual structure is ensured to be consistent as much as possible.

[0079] If the structure size is large or it is difficult to cut directly, a standard-sized multi-layer composite can also be prepared separately under the same temperature, humidity, pressure, etc. conditions as on-site.

[0080] Compressive Strength Test

[0081] Refer to ASTM D695 "Test Method for Compressive Properties of Rigid Plastics" or GB / T 1041-2008 "Determination of Compressive Properties of Plastics". Although these standards are mainly applied to plastics or plastic-based composites, they are also operable for multi-layer plugging structures.

[0082] The universal testing machine with corresponding measuring range and compression fixture is used for loading, and data such as the compression yield stress, failure stress and strain of the specimen can be obtained.

[0083] Impact strength test

[0084] GB / T 1043 (cantilever beam impact test) or GB / T 1843 (notched bar impact test), or ASTM D256 (Izod pendulum impact) and other methods can be selected, specifically depending on the specimen shape and clamping method.

[0085] For multi-layer structures, pendulum impact or drop hammer impact tests are preferably used to comprehensively investigate the interlayer bonding strength, the ability of ceramic particle distribution to disperse impact stress, etc.

[0086] The plugging structures provided in the above Examples 1-6 and Comparative Examples 1-12 were tested, and the test results are shown in Table 1 below.

[0087] Table 1 Mechanical properties of the plugging structures provided in Examples 1-6 and Comparative Examples 1-12

[0088]

[0089] As can be seen from Table 1, the compressive strength and impact strength of each example generally remained above 2.5 MPa and 0.49 KJ / m 2 respectively, while in comparison, Comparative Examples 1-8 were often lower than 2.0 MPa and 0.42 KJ / m 2 respectively, and the performance of Comparative Examples 9-12 declined even further to 1.2 MPa and 0.25 KJ / m 2 or even lower levels. Such an obvious difference shows that the multi-layer plugging process proposed in this application has significant superiority in mechanical performance. The core lies in sequentially constructing a filling layer, a wear-resistant protective layer and a reinforcing layer at the pipeline leak point: the filling layer formed by combining asbestos rope and sodium silicate solution can not only penetrate and plug the gap, but also provide a relatively stable bottom layer bond for the subsequent materials; after being covered with ceramic particles with reasonable particle size and material selection (such as alumina or zirconia), a strong "hard shell" is formed, which is sufficient to withstand the strong erosion under the high-speed flow of pulverized coal and high-temperature environment; finally, a glass fiber cloth impregnated with sodium silicate solution is used on the outer layer and cured under a suitable pressure (such as 0.3 MPa), further enhancing the interlayer bonding and endowing the plugging structure with high overall strength and toughness. In other words, this application does not rely on a single material in isolation, but greatly improves the heat resistance, wear resistance and impact resistance through the complementarity and matching between layers.

[0090] Among these examples, Example 4 is particularly prominent, with a compressive strength of up to 3.0 MPa and an impact strength of up to 0.55 KJ / m 2, indicating that when using a 38 wt% sodium silicate solution, a wear-resistant layer with a suitable thickness (60 mm), and 2.5 mm ceramic particles under a pressure of 0.3 MPa for curing, the plugging layer can obtain an extremely tight and stable interfacial bond, thus maintaining a long service life under harsh environments. However, even when compared with other embodiments (such as 1, 2, 3, 5, 6), the comprehensive mechanical properties are also at a high level (compressive strength of 2.5 - 2.9 MPa and impact strength of 0.49 - 0.54 KJ / m 2 ), fully demonstrating that as long as the key parameters are maintained within the ranges proposed in this application, such as the thickness selection of the filling layer and the wear-resistant protection layer, the particle size of the ceramic particles, and the concentration of the sodium silicate solution, etc., it can provide a much more stable plugging for the pulverized coal pipeline than the traditional solutions.

[0091] In contrast, in Comparative Examples 1 - 8, due to a single variable exceeding the reasonable range, whether the thickness of the wear-resistant layer or the filling layer is inappropriate, or the particle size of the ceramic particles is too large or too small, it will cause varying degrees of decline in mechanical properties, resulting in increased voids and uneven stress in some areas, or material peeling under the combined action of temperature difference and flow impact, thus significantly reducing the plugging life. Further, if the intermediate layer is removed or only the reinforcing layer is retained as in Comparative Examples 9 - 12, or replaced with epoxy resin without pressure curing, it is extremely easy to peel off under the high-temperature and high-speed scouring of pulverized coal, and the overall compressive and impact resistance properties even drop to 1.0 - 1.2 MPa and 0.20 - 0.25 KJ / m 2 . Such comparison results strongly confirm the necessity of the multi-layer composite solution and the overall synergistic effect: it is necessary to fully fill around the leakage point to ensure initial sealing and adhesiveness, and also need an appropriate ceramic material and a suitable thickness to form a rigid protection layer sufficient to resist scouring. Finally, it is necessary to enhance the integration and stability between layers by impregnating fiberglass cloth with sodium silicate solution and pressure curing. Thus, it can be seen that the multi-layer plugging method of this application is not simply piecing together different materials, but through systematic optimization of multiple parameters such as particle size, solution concentration, pressure, and layer thickness, forming an innovative composite plugging structure with high temperature resistance, scouring resistance, and high-strength bonding ability. Just because of this, this application shows great technical potential in resisting pulverized coal leakage, reducing shutdown maintenance, and ensuring production safety and economy.

[0092] For those of ordinary skill in the art, based on the above description, other different forms of changes or variations can also be made. It is not necessary and impossible to list all implementation manners here, and the obvious changes or variations derived therefrom are still within the protection scope of the claims of this invention.

Claims

1. A pipeline leak point plugging structure, characterized in that, The structure sequentially includes a filling layer, a wear-resistant protective layer, and a reinforcing layer from bottom to top, which are sealed at the pipeline leakage point. The filling layer is formed by filling asbestos rope and sodium silicate solution at the gap of the pipeline leakage point. The wear-resistant protective layer is formed by covering the filling layer with ceramic particles. The reinforcing layer is formed by covering the filling layer with glass cloth and sodium silicate solution and curing under pressure.

2. The pipeline leak point plugging structure according to claim 1, characterized in that, The thickness of the filling layer is 40mm - 60mm; the thickness of the wear-resistant protective layer is 40mm - 60mm; the thickness of the reinforcing layer is 3mm - 8mm.

3. The leak point plugging structure for a pipeline according to claim 1, wherein, The concentration of the sodium silicate solution is 30wt% - 38wt%.

4. The pipeline leak point plugging structure according to claim 1, characterized in that, The particle size of the ceramic particles is 1.5mm - 2.5mm.

5. The pipeline leak point plugging structure according to claim 1, characterized in that, The ceramic particles are selected from one or more of alumina, zirconia, silicon carbide, boron carbide, and mullite.

6. The pipeline leak point plugging structure according to claim 5, characterized in that, The ceramic particles are alumina.

7. A method for plugging pipeline leakage points, characterized in that, Forming the plugging structure according to any one of claims 1 - 6 at the pipeline leakage point includes the following process: Clean the impurities around the pipeline leakage point and ensure the pipeline surface is dry. Mix the sodium silicate solution with asbestos rope and tightly fill it at the pipeline leakage point to form a filling layer. Cover ceramic particles outside the filling layer and perform compaction treatment to form a wear-resistant protective layer. Fully immerse the glass cloth in the sodium silicate solution and then wrap it around the outer surface of the wear-resistant protective layer and fix it under pressure to form a reinforcing layer.

8. The method for plugging pipeline leakage points according to claim 7, wherein, The pressure for fixing under pressure is 0.1MPa - 0.3MPa.

9. Application of a pipeline leak point plugging structure, characterized in that, The plugging structure is applied to the leakage point of the pulverized coal pipeline.

10. The application of the pipeline leak point plugging structure according to claim 9, characterized in that, The flow rate of the pulverized coal transported by the pulverized coal pipeline is 10m / s - 30m / s, and the transportation temperature range is 30°C - 70°C.

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