High-strength thermoplastic composite pipeline with metal armored reinforcing layer

Abstract

The invention discloses a high-strength thermoplastic composite pipeline with a metal armored reinforcing layer, belongs to the field of development of clean energy such as natural gas and hydrogen, and is suitable for conveying the clean energy such as natural gas and hydrogen. The pipeline sequentially comprises a lining layer, a reinforcing layer, an anti-abrasion layer, a heat preservation layer, a protection layer, an auxiliary layer, a metal armoring layer, an anti-abrasion layer and a metal armoring reinforcing layer from inside to outside. The lining layer is made of a polytetrafluoroethylene material, the reinforcing layer is formed by spirally winding a high-strength carbon fiber material, the anti-abrasion layer is made of a polyethylene material, the heat preservation layer is made of an aerogel material, and the protection layer is made of a high-density polyethylene material. The two metal armor layers are buckled and connected in a staggered mode through C-shaped interlocking components which are spirally wound in the reverse direction, and the spiral winding angle is 30 degrees. The C-shaped interlocking structure is composed of an outer lock catch and an inner lock catch. Through the multi-layer structural design, the tensile strength, the impact resistance and the torsional strength of the thermoplastic composite pipeline can be effectively improved, the service life of the pipeline is prolonged, and the safety and the stability of the pipeline under complex working conditions are enhanced.

Description

Technical Field

[0001] The invention belongs to the technical field of development of clean energy such as natural gas and hydrogen, and relates to a high-strength thermoplastic composite pipeline with a metal armor reinforcement layer. Background Art

[0002] In the context of the global transition to clean energy, the application of natural gas and hydrogen as low-carbon energy sources has become more and more extensive, and the demand for safe and efficient transportation pipelines has also increased. However, the existing traditional metal pipelines have gradually exposed some shortcomings in use. First, metal pipelines are susceptible to corrosion, wear and other problems when transporting high-pressure gases for a long time, especially in complex environments such as the ocean and underground, where the maintenance cost is high and the service life is limited. Secondly, hydrogen, due to its extremely small molecular structure and high diffusivity, can cause hydrogen embrittlement, which significantly reduces the strength and toughness of metal pipelines and increases safety hazards during transportation. In addition, traditional steel pipes are heavy, and more energy and human resources are required during installation and maintenance, which is not conducive to flexible application under some complex working conditions. In order to solve these problems, the use of new thermoplastic composite pipes (TCP) has gradually become a trend. Thermoplastic composite materials have the advantages of excellent corrosion resistance, light weight, high strength, and easy maintenance. They have low permeability during hydrogen transportation and can effectively avoid hydrogen embrittlement. However, existing composite pipes have certain limitations when it comes to withstanding tensile and torsional loads, and their structural forms are usually simple, making it difficult to maintain stability while simultaneously withstanding complex multi-directional forces. Especially when facing external shocks, mechanical collisions or environmental pressures, they are prone to deformation or breakage, which reduces their durability under harsh conditions and poses certain safety risks. Summary of the invention

[0003] In view of the defects or shortcomings in the above-mentioned technology, the present invention designs a thermoplastic composite pipe containing a metal armor reinforcement layer, which can simultaneously resist tensile strength and external environmental load impact, and avoid extrusion of the internal structure, in order to provide a safer and more economical solution for the transportation of natural gas and hydrogen.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A high-strength thermoplastic composite pipe with a metal armor reinforcement layer, the high-strength thermoplastic composite pipe mainly includes an inner lining layer 1, a reinforcement layer 2, an anti-wear layer 3, a thermal insulation layer 4, a protective layer 5, an auxiliary layer 6, a metal armor layer 7, an anti-wear layer 8, and a metal armor reinforcement layer 9 from the inside to the outside. The reinforcement layer 2 is coated on the outside of the inner lining layer 1, the anti-wear layer 3 is coated on the outside of the reinforcement layer 2, the thermal insulation layer 4 is coated on the outside of the anti-wear layer 3, the protective layer 5 is coated on the outside of the thermal insulation layer 4, the auxiliary layer 6 is coated on the outside of the protective layer 5, the metal armor layer 7 is coated on the outside of the auxiliary layer 6, the anti-wear layer 8 is coated on the outside of the metal armor layer 7, and the metal armor reinforcement layer 9 is coated on the outside of the anti-wear layer 8.

[0006] Furthermore, the inner lining layer 1 is made of polytetrafluoroethylene material, which is used for the basic fluid transportation and anti-seepage functions of the pipeline.

[0007] Furthermore, the reinforcement layer 2 comprises at least two material layers made of high-strength carbon fiber material, which are spirally wound at an angle of more than 75°, and are mainly used to resist the internal pressure of the pipeline.

[0008] Furthermore, the anti-wear layer 3 is made of polyethylene (PE) material with a thickness not exceeding 2 mm to prevent wear of the internal structure.

[0009] Furthermore, the thermal insulation layer 4 is made of aerogel material and is used for heat insulation to maintain the temperature stability inside the pipeline.

[0010] Furthermore, the protective layer 5 is made of high-density polyethylene (HDPE) material to provide protection for the internal structure of the pipeline and prevent physical or chemical corrosion.

[0011] Furthermore, the auxiliary layer 6 is made of polyurethane foam to alleviate extrusion and wear.

[0012] Furthermore, the metal armor layer 7 is connected by a plurality of C-shaped interlocking structures which are interlocked and staggered, and spirally wound on the outside of the auxiliary layer 6, and the spiral winding angle is 30°. The C-shaped interlocking structure is composed of an outer locking buckle and an inner locking buckle. When the interlocking structure is subjected to axial tension, the C-shaped interlocking structures are adaptively tightened and reach a tightly surrounded state. After forming a minimum surrounding circle, they will not continue to tighten, avoiding extrusion damage to the internal structure of the pipeline, which is conducive to increasing the mechanical strength of the pipeline and providing the ability to resist tensile deformation.

[0013] Furthermore, the anti-wear layer 8 is made of polyethylene (PE) material with a thickness not exceeding 2 mm to prevent wear between metal armor layers.

[0014] Furthermore, the metal armor reinforcement layer 9 is interlocked and connected by multiple C-shaped interlocking structures and is wound on the outside of the wear-resistant layer at an angle opposite to the winding direction of the metal armor layer 7, and the spiral winding angle is 30°. The two layers of metal armor are wound in the opposite direction to enhance the tensile strength and torsion resistance of the pipeline. The C-shaped interlocking structure consists of an outer locking buckle and an inner locking buckle. When the interlocking structure is subjected to axial tension, the C-shaped interlocking structures are adaptively tightened and reach a tightly surrounded state. At this time, a minimum surrounding circle is formed, and even if the tension increases, it will not continue to tighten, avoiding extrusion damage to the internal structure of the pipeline, which is beneficial to increase the mechanical strength of the pipeline and provide the ability to resist tensile deformation. At the same time, the close fit of the inner and outer locking buckles prevents external fluids from entering the interior of the pipeline to cause corrosion and damage, and the components bite each other to avoid the loss of stability of the structure.

[0015] The innovation of the present invention lies in the design of a thermoplastic composite pipeline with a metal armor reinforcement layer. Multiple metal C-shaped interlocking armor structures are interlocked and connected, which can simultaneously resist stretching and external environmental load impact, and avoid extrusion of the internal structure. The pipeline has achieved high strength, durability and safety under complex working conditions, and is particularly suitable for the transportation of clean energy such as natural gas and hydrogen.

[0016] The beneficial effects of the present invention are:

[0017] (1) The armor layer provides a critical mechanical protection barrier: The present invention wraps the metal armor interlocking reinforcement layer around the outermost layer of the pipeline to form the first line of defense, directly resisting external mechanical shocks and physical damage. At the same time, the interlocking structure design can ensure that the pipeline will not excessively contract radially when subjected to axial tension, causing extrusion damage to the inside of the pipeline. Compared with traditional pipeline structures, the design of the present invention can effectively disperse the external pressure through the spirally wound metal layer, avoiding stress concentration in the internal functional layers (such as the lining layer, reinforcement layer, etc.), thereby greatly improving the overall structural integrity and service life of the pipeline. In addition, the moderate weight of the external armor layer also enhances the pipeline's impact resistance in harsh environments.

[0018] (2) The metal armor layer with small-angle spiral winding significantly improves the tensile performance: Compared with the traditional thermoplastic composite pipe structure, the present invention adopts a small-angle spiral winding design of the metal armor layer, which significantly improves the tensile performance of the pipe. The reversely wound metal layer evenly shares the tension, ensuring that the pipe will not break or deform excessively due to excessive tension when laid over long distances. It is particularly suitable for use in high-pressure and complex environments. This structure innovatively solves the load-bearing capacity limitations of traditional thermoplastic composite pipes in long-distance transportation.

[0019] (3) Reverse-wound metal armor layer improves torsional performance: Although thermoplastic composite materials have good corrosion resistance and are lightweight and high-strength, they are relatively flexible and are prone to stress concentration when facing torsional stress, causing the pipeline to twist, deform, or even fail. Especially in the absence of metal armor reinforcement, the single structure of the pipeline makes it difficult to effectively resist or disperse torsional forces, resulting in uneven local stress and low stability, which can easily lead to cumulative torsional damage after long-term use. The double-layer reverse-wound metal armor layer designed in the present invention significantly improves its torsional strength. The reverse-wound two-layer structure can balance and offset torsional stress, balance local loads, and enhance the stability and service life of the pipeline in complex environments.

[0020] (4) Insulation layer maintains temperature stability and prevents moisture erosion: The insulation layer of the pipeline is made of aerogel material, which can effectively isolate the heat exchange between the internal medium and the external environment, reduce heat loss, and prevent condensation, freezing or frost on the surface. This not only protects the structural integrity of the pipeline, but also improves the overall operational safety, especially under extreme climatic conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of a high-strength thermoplastic composite pipeline with a metal armor reinforcement layer provided by the present invention;

[0022] In the figure: 1 inner lining layer, 2 reinforcement layer, 3 anti-wear layer, 4 thermal insulation layer, 5 protective layer, 6 auxiliary layer, 7 metal armor layer, 8 anti-wear layer, 9 metal armor reinforcement layer.

[0023] Figure 2 A schematic cross-sectional view of a high-strength thermoplastic composite pipe with a metal armor reinforcement layer provided by the present invention;

[0024] Figure 3 A schematic cross-sectional view of a C-type metal armor reinforcement layer provided by the present invention;

[0025] Figure 4 A schematic cross-sectional view of the outer lock buckle of the C-type metal armor reinforcement layer provided by the present invention;

[0026] Figure 5 This is a schematic cross-sectional diagram of the inner lock buckle of the C-type metal armor reinforcement layer provided by the present invention;

[0027] Figure 6 A schematic diagram of radial deformation of a high-strength thermoplastic composite pipe with a metal armor reinforcement layer provided by the present invention; DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with specific implementation cases.

[0029] The present invention relates to a high-strength thermoplastic composite pipe with a metal armor reinforcement layer, and the present invention is further described below in conjunction with a specific embodiment. The pipe includes the following structural layers from the inside to the outside:

[0030] (1) lining layer 1;

[0031] The inner lining layer 1 is made of polytetrafluoroethylene (PTFE) material with a thickness of 5 mm. Its main function is to provide a basic fluid transport channel for the pipeline and has excellent anti-leakage ability. PTFE material has excellent chemical corrosion resistance and good thermal stability, can adapt to the fluid transport needs in extreme environments, and ensure the safe and stable operation of the pipeline under harsh working conditions.

[0032] (2) Enhancement layer 2;

[0033] The reinforcement layer 2 is wrapped around the outside of the inner lining layer 1 and consists of two layers of high-strength carbon fiber material, which is wound at a spiral angle of 75° and has a total thickness of 4mm. The reinforcement layer is mainly used to resist the fluid pressure inside the pipeline, improve the pressure resistance of the pipeline, and maintain a relatively light deadweight. The spirally wound carbon fiber layer can effectively disperse the internal stress and ensure the stability of the pipeline under high-pressure environment.

[0034] (3) anti-wear layer 3;

[0035] The anti-wear layer 3 is made of polyethylene (PE) material with a thickness of 2 mm and is coated on the outside of the reinforcement layer 2. This layer is used to prevent the reinforcement layer from being worn during use, especially under high pressure and long-term flow conditions, and to extend the service life of the pipeline.

[0036] (4) Insulation layer 4;

[0037] The insulation layer 4 is coated on the outside of the anti-wear layer 3 and is made of aerogel material with a thickness of 15 mm. Aerogel material has excellent thermal insulation performance, which can effectively block the change of external environmental temperature and maintain the temperature stability of the fluid inside the pipeline. This layer design is particularly suitable for pipelines operating under low or high temperature conditions, which helps to reduce energy loss.

[0038] (5) protective layer 5;

[0039] The protective layer 5 is coated on the outside of the insulation layer 4 and is made of high-density polyethylene (HDPE) material with a thickness of 5 mm. The HDPE material has good impact resistance and chemical corrosion resistance, and can provide protection for the internal structure of the pipeline to prevent physical damage or chemical corrosion, thereby improving the overall durability and reliability of the pipeline.

[0040] (6) auxiliary layer 6;

[0041] The auxiliary layer 6 is coated on the outside of the protective layer 5, has a thickness of 3 mm, and is made of polyurethane foam material. It is mainly used to buffer external extrusion force and prevent wear. This layer not only enhances the anti-extrusion ability of the pipeline, but also provides additional protection in harsh environments.

[0042] (7) Metal armor layer 7;

[0043] The metal armor layer 7 is composed of multiple C-shaped interlocking structures that are interlocked and staggered, and are spirally wound around the outside of the auxiliary layer, with a spiral winding angle of 30°. The C-shaped interlocking structure consists of an outer locking buckle 901 and an inner locking buckle 902. The width of the outer locking buckle 901 is 2.4 mm and the height is 1.2 mm, and the width of the inner locking buckle 902 is 2 mm and the height is 1.2 mm. The width ratio of the outer locking buckle 901 and the inner locking buckle 902 is 1.2, the height ratio is 1, and the total thickness is 1.6 mm. There are 43 outer locking buckles 901 and 43 inner locking buckles 902. When the interlocking structure is subjected to axial tension, the C-shaped interlocking structures are adaptively tightened and reach a tightly enclosed state, and will not continue to tighten after forming a minimum encirclement circle.

[0044] (8) anti-wear layer 8;

[0045] The anti-wear layer 8 is coated on the outside of the metal armor layer 7 and is made of polyethylene (PE) material with a thickness of 1.8 mm. This layer is used to reduce the friction between the metal armor layers, prevent damage caused by long-term mechanical friction, and further improve the durability and safety of the pipeline.

[0046] (9) Metal armor reinforcement layer 9;

[0047] The metal armor reinforcement layer 9 is connected by a plurality of C-shaped interlocking structures that are interlocked and staggered, and is spirally wound on the outside of the wear-resistant layer 8, with a spiral winding angle of 30°, and a spiral winding direction opposite to the metal armor layer 7. The width of the outer lock buckle 901 is 2.4 mm, and the height is 1.2 mm, and the width of the inner lock buckle 902 is 2 mm, and the height is 1.2 mm. The width ratio of the outer lock buckle 901 and the inner lock buckle 902 is 1.2, the height ratio is 1, and the total thickness is 1.6 mm. There are 50 outer lock buckles 901 and 50 inner lock buckles 902. When the interlocking structure is subjected to axial tension, the C-shaped interlocking structures are adaptively tightened and reach a tightly enclosed state, and will not continue to tighten after forming a minimum enclosing circle.

[0048] The present invention, through the design of the above-mentioned multi-layer structure, especially the mutual cooperation of the double-layer metal armor layer, not only enhances the internal pressure bearing capacity and external impact resistance of the pipeline, but also improves the tensile and torsional properties, wear resistance and thermal insulation of the pipeline, and is suitable for the transportation of fluids such as liquefied natural gas. In the actual use of the pipeline, the structure can significantly improve its operating safety, stability and durability, and adapt to various complex working conditions.

[0049] The above-described embodiments merely express the implementation methods of the present invention, but they cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A high-strength thermoplastic composite pipe with a metal armor reinforcement layer, characterized in that: The high-strength thermoplastic composite pipe is a multi-layer structure, which comprises, from the inside to the outside, an inner lining layer (1), a reinforcement layer (2), an anti-wear layer (3), a thermal insulation layer (4), a protective layer (5), an auxiliary layer (6), a metal armor layer (7), an anti-wear layer (8), and a metal armor reinforcement layer (9); the reinforcement layer (2) comprises at least two material layers made of high-strength carbon fiber material, the metal armor layer (7) is formed by a plurality of C-shaped interlocking structures interlocked and connected, and the metal armor reinforcement layer (9) is formed by a plurality of C-shaped interlocking structures interlocked and connected.

2. A high-strength thermoplastic composite pipe with a metal armor reinforcement layer according to claim 1, characterized in that: The metal armor reinforcement layer (9) is wound on the outer side of the anti-wear layer at an angle opposite to the winding direction of the metal armor layer (7), and the spiral winding angle of the metal armor reinforcement layer (9) is 30°; the spiral winding angle of the metal armor layer (7) is 30°.

3. The high-strength thermoplastic composite pipe with a metal armor reinforcement layer according to claim 1, characterized in that: The C-shaped interlocking structure is composed of an outer locking buckle and an inner locking buckle. When the interlocking structure is subjected to axial tension, the C-shaped interlocking structure is adaptively tightened and reaches a tightly enclosed state. After forming the minimum enclosed circle, it does not continue to tighten to avoid squeezing and damage to the internal structure of the pipeline.

4. The high-strength thermoplastic composite pipe with a metal armor reinforcement layer according to claim 1, characterized in that: The reinforcement layer (2) is formed by spiral winding at an angle of more than 75°.

5. The high-strength thermoplastic composite pipe with a metal armor reinforcement layer according to claim 1, characterized in that: The inner lining layer (1) is made of polytetrafluoroethylene material.

6. The high-strength thermoplastic composite pipe with a metal armor reinforcement layer according to claim 1, characterized in that: The anti-wear layer (3) is made of polyethylene (PE) material with a thickness not exceeding 2 mm.

7. The high-strength thermoplastic composite pipe with a metal armor reinforcement layer according to claim 1, characterized in that: The thermal insulation layer (4) is made of aerogel material.

8. The high-strength thermoplastic composite pipe with a metal armor reinforcement layer according to claim 1, characterized in that: The protective layer (5) is made of high-density polyethylene (HDPE) material.

9. The high-strength thermoplastic composite pipe with a metal armor reinforcement layer according to claim 1, characterized in that: The auxiliary layer (6) is made of polyurethane foam.

10. The high-strength thermoplastic composite pipe with a metal armor reinforcement layer according to claim 1, characterized in that: The anti-wear layer (8) is made of polyethylene (PE) material with a thickness not exceeding 2 mm.

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