Novel pipeline external anti-corrosion structure

Abstract

The utility model discloses a novel pipeline external anti-corrosion structure which comprises a steel natural gas pipeline, radiating fins are arranged at two ends of the steel natural gas pipeline, and a high-temperature external anti-corrosion layer is arranged on the surface of the pipeline. The high-temperature outer anti-corrosion layer sequentially comprises a high-temperature-resistant graphene nano coating, an aluminum oxide aerogel layer and a polyimide sleeve from inside to outside, and all the layers are tightly attached. The two sides of the polyimide sleeve and the buckle connecting position are sealed through room-temperature-cured waterproof sealing cement gum. According to the structure, through the multi-layer protection design, the high-temperature-resistant and corrosion-resistant performance of the surface of the pipeline is effectively enhanced, safe operation of the pipeline in a high-temperature environment is guaranteed, and the structure is suitable for natural gas pipelines close to heat distribution pipelines in urban pipe networks and other pipeline systems needing high-temperature-resistant and corrosion-resistant protection. The method has the advantages of simple construction, good economic and social benefits, wide applicability and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline anti-corrosion, and in particular to a novel pipeline external anti-corrosion structure suitable for high-temperature and corrosive environments. The structure is particularly suitable for natural gas pipelines close to thermal pipelines in urban pipeline networks to improve their local high-temperature resistance and corrosion resistance. Background Art

[0002] The safe operation of pipelines is crucial in the oil, gas, and chemical industries. However, in some specialized environments, such as areas near thermal pipelines in urban networks, pipeline surfaces can be subject to the dual erosion of high temperatures and corrosive media. This can lead to localized high temperatures, making traditional corrosion protection structures inadequate. Therefore, a new type of external pipeline corrosion protection is needed to improve the pipeline's resistance to high temperatures and corrosion, ensuring safe operation. Summary of the Invention

[0003] The purpose of this utility model is to provide a new type of pipeline external anti-corrosion structure, which effectively enhances the high temperature resistance and corrosion resistance of the pipeline surface through a multi-level protection design, and ensures the safe operation of the pipeline in a high temperature environment.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A novel pipeline external corrosion protection structure includes a steel natural gas pipeline with heat dissipation fins at both ends and a high-temperature external corrosion protection layer on the pipeline surface. The high-temperature external corrosion protection layer comprises, from the inside to the outside, a high-temperature resistant graphene nanocoating, an alumina aerogel layer, and a polyimide sleeve.

[0006] The heat dissipation fins are arranged around the steel natural gas pipeline to form a 360-degree omnidirectional heat dissipation effect, effectively reducing the local temperature of the pipeline.

[0007] The high-temperature-resistant graphene nanocoating is applied to the outer surface of a steel natural gas pipeline with a thickness of 0.3 to 0.6 mm. The graphene nanocoating has excellent thermal conductivity and mechanical strength, effectively resisting high-temperature corrosion while enhancing the mechanical properties of the pipeline surface. There are several options for high-temperature-resistant graphene nanocoatings: pure graphene nanocoatings, composed of single or multiple layers of graphene, offer exceptionally high thermal and electrical conductivity and mechanical strength; graphene / polymer nanocoatings, combining graphene with polymers for enhanced flexibility and adhesion; and graphene / metal nanocoatings, combined with metals, enhance wear and corrosion resistance.

[0008] The alumina aerogel layer is filled between the high-temperature resistant graphene nanocoating and the polyimide sleeve, with a thickness of 10 to 30 mm. The alumina aerogel layer has good high-temperature resistance and corrosion resistance, can effectively isolate external corrosive media, and at the same time reduce the surface temperature of the pipeline. There are many options for alumina aerogel: high-strength, high-temperature resistant alumina aerogel is prepared by mixing aluminum salt and ethanol solution with specific ingredients. It has low thermal conductivity, high compressive strength, low density and large specific surface area; fiber composite alumina aerogel is composited with fiber materials to improve strength and toughness; high-temperature resistant alumina-based aerogel has a high alumina content and stable performance in high-temperature environments.

[0009] The polyimide sleeve, covering the outer surface of the alumina aerogel layer, has a thickness of 5 to 30 mm. The polyimide sleeve offers excellent heat resistance, corrosion resistance, and mechanical properties, further protecting the pipeline from environmental corrosion. Polyimide sleeves are available in a variety of options: pure polyimide sleeves are made from polyimide resin, offering excellent heat resistance, corrosion resistance, and mechanical properties; reinforced polyimide sleeves incorporate reinforcing materials such as glass fiber and carbon fiber for increased strength and rigidity; and composite polyimide sleeves are combined with ceramics, metals, and other materials for even superior performance.

[0010] In addition, a room-temperature-curing waterproof sealant is used on both sides of the polyimide sleeve and at the snap-on connection to ensure a leak-proof seal between the alumina aerogel layer and the high-temperature-resistant graphene nanocoating. Several sealing mortar options are available: silicone, with its unique molecular structure, is stable and weather-resistant; polyurethane, with its diverse molecular structure, is shock-resistant, fatigue-resistant, and low-temperature resistant; polysulfide, with its air-proof, oil-resistant, and solvent-resistant properties; butyl, with its paste-like consistency, resists sagging and adheres well to a variety of materials; and acrylic, solvent-free, room-temperature-curing, elastic, and well-adherent to a variety of materials.

[0011] In practical applications, the appropriate materials and thicknesses of high-temperature resistant graphene nano-coating, alumina aerogel layer and polyimide sleeve can be flexibly selected according to the temperature of the pipeline surface and the properties of the corrosive medium to achieve the best anti-corrosion effect.

[0012] The new pipeline external anti-corrosion structure provided by the utility model effectively enhances the high temperature resistance and corrosion resistance of the pipeline surface through a multi-level protection design. It is particularly suitable for natural gas pipelines that are close to thermal pipelines in urban pipeline networks, ensuring the safe operation of the pipeline in high temperature environments.

[0013] Beneficial effects

[0014] The novel pipeline external anti-corrosion structure provided by this utility model has significant beneficial effects by combining a multi-layer protection design including heat dissipation fins, high-temperature resistant graphene nano-coating, alumina aerogel layer and polyimide sleeve, as well as a sealing treatment with room temperature curing waterproof sealing putty:

[0015] Significantly improve the high temperature and corrosion resistance of the pipeline: Through the use of high temperature resistant graphene nano coating and alumina aerogel layer, a strong high temperature and corrosion resistant barrier is formed, which effectively resists the erosion of high temperature environment and corrosive media, ensuring the safe operation of the pipeline.

[0016] All-round heat dissipation effect: The design of the heat dissipation fins achieves 360-degree all-round heat dissipation around the pipeline, effectively reducing the local temperature of the pipeline, preventing material performance degradation and structural damage caused by high temperature, and extending the service life of the pipeline.

[0017] Excellent sealing performance: The application of room temperature curing waterproof sealing putty ensures the sealing of the overall structure, prevents corrosive media from invading the interior of the pipeline, and further enhances the durability of the anti-corrosion structure.

[0018] Simple construction and easy operation: Each layer of protective material can be constructed by spraying, pasting or winding, which is simple and quick to operate, reducing construction period and cost.

[0019] Wide applicability: The new pipeline external anti-corrosion structure of the utility model is particularly suitable for natural gas pipelines that are close to thermal pipelines in urban pipeline networks. It is also suitable for other pipeline systems that require high temperature resistance and corrosion resistance protection, and has wide applicability.

[0020] To sum up, the new pipeline external anti-corrosion structure of the utility model effectively enhances the high temperature resistance and corrosion resistance of the pipeline surface through multi-level protection design and all-round heat dissipation effect, ensures the safe operation of the pipeline in high temperature environment, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of this patent, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of this patent and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 This is a schematic diagram of the new pipeline external anti-corrosion structure of the present utility model.

[0023] In the figure: 1-steel natural gas pipeline; 2-heat dissipation fin; 3-high-temperature external anti-corrosion layer; 31-high-temperature resistant graphene nano-coating; 32-alumina aerogel layer; 33-polyimide sleeve; 34-room temperature curing waterproof sealing putty.

[0024] The following is a detailed explanation of the main components of the structure:

[0025] 1-Steel natural gas pipeline: the main body for transporting natural gas.

[0026] 2-Heat dissipation fins: fit the outer wall of the pipe, dissipate heat 360 degrees, and reduce local temperature.

[0027] 3- High temperature outer anti-corrosion layer: including high temperature resistant graphene nano coating, alumina aerogel layer and polyimide sleeve to enhance high temperature and corrosion resistance.

[0028] 31-High temperature resistant graphene nano coating: Made of graphene nanomaterials, covering the outer surface of the pipe, with a thickness of 0.3-0.6mm, to resist high temperature erosion.

[0029] 32-Alumina aerogel layer: made of alumina aerogel material, filled between the coating and the sleeve, with a thickness of 10-30mm, isolating the corrosive medium and reducing the temperature.

[0030] 33-Polyimide sleeve: Made of polyimide material, coated on the outside of the aerogel layer, with a thickness of 5-30mm, protecting the pipeline from erosion.

[0031] 34-Room temperature curing waterproof sealant: Usually made from materials such as silicone, polyurethane, polysulfide, butyl, or acrylic, it cures at room temperature and provides a waterproof seal. Apply to both sides of the sleeve and the snap-on connection.

[0032] The accompanying drawings illustrate the various components of the novel pipeline external corrosion protection structure and their relative positions, which helps to better understand the technical solution and implementation methods of the utility model. In actual application, the size, shape and material of each component can be adjusted and optimized according to specific needs. DETAILED DESCRIPTION

[0033] The specific implementation of the present invention will be further described in detail below with reference to the accompanying drawings.

[0034] Step 1: Prepare the steel natural gas pipeline 1. Derust and clean the pipeline surface to ensure that the pipeline surface is clean, dry and free of oil.

[0035] Step 2: Evenly spray the high-temperature-resistant graphene nanocoating 31 onto the pipeline surface to form the first protective layer. The high-temperature-resistant graphene nanocoating 31 can be applied to the surface of the steel natural gas pipeline 1 by spraying or brushing, ensuring a uniform and dense coating with a thickness of 0.3-0.6 mm.

[0036] Step 3: Tightly adhere an alumina aerogel layer 32 to the exterior of the high-temperature-resistant graphene nanocoating 31 to form a second protective layer. The alumina aerogel layer 32 can be prefabricated into a sheet-like structure based on the pipe size and then adhered to the surface of the high-temperature-resistant graphene nanocoating 31 by gluing or wrapping. The alumina aerogel layer 32 can be applied to the exterior of the high-temperature-resistant graphene nanocoating 31 by filling or coating. The thickness is 10-30 mm.

[0037] Step 4: Tightly wrap the alumina aerogel layer 32 with a polyimide sleeve 33 to form a third protective layer. The polyimide sleeve 33 can be attached to the alumina aerogel layer 32 using a snap-fit connection to ensure a tight fit between the sleeve and the pipe. The thickness should be 5-30 mm.

[0038] Step 5: Evenly apply or fill room temperature curing waterproof sealing putty 34 on both sides of the polyimide sleeve 33 and the snap connection position, and form a dense sealing layer after curing to ensure the sealing of the overall structure.

[0039] Step 6: Install the heat dissipation fins 2 around the pipe. The heat dissipation fins fit tightly against the outer wall of the pipe to achieve a full range of heat dissipation. The heat dissipation fins 2 can be fixed to the pipe by welding or snap-fitting.

[0040] Through the above steps, the construction of the novel pipeline external anti-corrosion structure of the present invention can be completed. During the construction process, it is necessary to ensure the uniformity and tightness of each layer of protective material to ensure the overall performance of the anti-corrosion structure.

[0041] In practical applications, the novel external pipeline anti-corrosion structure of the present invention can be adjusted and optimized based on the specific usage environment and requirements. For example, the size and number of heat dissipation fins 2 can be selected based on the diameter and length of the pipeline; the materials and thicknesses of the high-temperature-resistant graphene nanocoating 31, alumina aerogel layer 32, and polyimide sleeve 33 can be selected based on the pipeline surface temperature and the properties of the corrosive medium; and the connection and sealing method of the polyimide sleeve 33 can be selected based on the pipeline installation method and requirements.

[0042] In summary, this utility model provides a novel external pipeline anti-corrosion structure. Through its multi-layered protection design and comprehensive heat dissipation, it effectively enhances the high-temperature and corrosion resistance of the pipeline surface, providing reliable protection for the safe operation of the pipeline system. This structure has broad application prospects and is suitable for various pipeline systems requiring high-temperature and corrosion protection.

Claims

1. A new type of pipeline external anti-corrosion structure, characterized in that: It includes a steel natural gas pipeline, both ends of which are provided with heat dissipation fins, and the surface of the steel natural gas pipeline is provided with a high-temperature external anti-corrosion layer, which includes a high-temperature resistant graphene nano-coating, an alumina aerogel layer and a polyimide sleeve; room-temperature curing waterproof sealing putty is provided on both sides of the polyimide sleeve and at the snap connection position.

2. The novel pipeline external anti-corrosion structure according to claim 1 is characterized in that: The heat dissipation fins are made of metal heat-conducting material, closely fit on the outer wall of the steel natural gas pipeline, and are arranged around the pipeline to form an all-round heat dissipation effect.

3. The novel pipeline external anti-corrosion structure according to claim 1 or 2, characterized in that: The high-temperature resistant graphene nanocoating is evenly sprayed on the outer surface of the steel natural gas pipeline to form a dense protective layer, including one or more of pure graphene nanocoating, graphene / polymer nanocoating, and graphene / metal nanocoating.

4. The novel pipeline external anti-corrosion structure according to claim 1 is characterized in that: The alumina aerogel layer is tightly attached to the outside of the high-temperature resistant graphene nano-coating to form a high-temperature insulation layer, which includes one or more of high-strength and high-temperature resistant alumina aerogel, fiber composite alumina aerogel, and high-temperature resistant alumina-based aerogel.

5. The novel pipeline external anti-corrosion structure according to claim 1 is characterized in that: The polyimide sleeve is tightly coated on the outside of the alumina aerogel layer and fixed to the steel natural gas pipeline by a snap connection method. It includes one or more of a pure polyimide sleeve, a reinforced polyimide sleeve, and a composite polyimide sleeve.

6. The novel pipeline external anti-corrosion structure according to claim 1 is characterized in that: The room temperature curing waterproof sealing putty is evenly applied on both sides of the polyimide sleeve and the snap connection position, and forms a dense sealing layer after curing, including one or more of silicone, polyurethane, polysulfide, butyl, and acrylic acid.

7. The novel pipeline external anti-corrosion structure according to claim 1 is characterized in that: The spraying thickness of the high-temperature resistant graphene nano coating is 0.3-0.6 mm.

8. The novel pipeline external anti-corrosion structure according to claim 1 is characterized in that: The thickness of the alumina aerogel layer is 10-30 mm.

9. The novel pipeline external anti-corrosion structure according to claim 1 is characterized in that: The thickness of the polyimide sleeve is 5-30 mm.

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