High-barrier high-pressure hydrogen conveying polyethylene composite pipe

Abstract

The utility model discloses a high-barrier high-pressure hydrogen conveying polyethylene composite pipe which sequentially comprises a polyethylene plastic inner pipe layer, a continuous fiber prepreg tape reinforced core layer and a polyethylene plastic outer layer from inside to outside. The continuous fiber prepreg tape reinforced core layer is formed by winding continuous fiber prepreg tapes in a staggered mode in the left-right direction according to the set angle alpha in the axial direction of the inner pipe and is laid and attached in a melting mode, and the polyethylene plastic inner pipe layer is completely covered with the continuous fiber prepreg tape reinforced core layer. Three continuous fiber prepreg tape reinforced core layers are fused and bonded at different winding angles to form a structural monomer, and a plurality of structural monomers are fused and bonded to form a reinforced layer. According to the utility model, the polyethylene plastic inner pipe layer, the continuous fiber prepreg tape reinforced core layer and the polyethylene plastic outer layer form a three-layer composite pipe body with high rigidity, high tensile strength and high compression resistance; and the composite stress of axial tension and circumferential pressure of the composite pipe is borne by the continuous fiber band reinforced core layer with different winding angles or by combining with the inner-layer plastic pipe and the outer-layer plastic pipe.

Description

Technical Field

[0001] The utility model relates to a plastic pipe, in particular to a high-barrier high-pressure hydrogen transport polyethylene composite pipe. Background Art

[0002] As a new type of composite pipe, continuous fiber reinforced plastic (CFRT) pipe has a series of unique advantages such as light weight, high strength, low cost, corrosion resistance, and green environmental protection. It has great application prospects in the fields of municipal administration, water conservancy, coal, chemical, oil and gas, and has attracted widespread attention in the pipeline industry.

[0003] Pipeline companies both domestically and internationally have conducted in-depth research on continuous fiber-reinforced pipe composite materials and their manufacturing processes. Fiber-reinforced thermoplastic pipes are currently in the development phase. However, these products are currently primarily focused on small-diameter pipes (under 200 mm) or low-pressure drainage pipes. As diameters increase and pressures rise, these products are unable to meet the high tensile and compressive strength requirements.

[0004] my country's hydrogen transportation system is incomplete, with only approximately 400 kilometers of existing hydrogen pipelines. The planning and construction of hydrogen energy infrastructure is still in its early stages. With the development of hydrogen energy, demand for hydrogen pipelines is expected to increase significantly in the coming decades. According to the "China Hydrogen Energy Industry Infrastructure Development Blue Book," by 2030, my country's hydrogen pipelines will reach 3,000 kilometers.

[0005] Compared to natural gas environments, long-term operation of metal materials in hydrogen environments can lead to deterioration in mechanical properties, a phenomenon known as environmental hydrogen embrittlement. Due to this effect, the materials used in hydrogen pipelines are subject to certain restrictions compared to natural gas pipelines in terms of alloying elements, steel grades, pipe types, and operating pressures. In hydrogen pipelines, the presence of a hydrogen environment can induce hydrogen embrittlement, potentially leading to pipeline failure. Factors such as the steel pipe forming process, weld quality, defect size, and steel strength all influence the probability of failure.

[0006] To reduce the material cost of hydrogen pipelines, it is necessary to evaluate the burst pressure of fiber composite materials under high-pressure hydrogen conditions, their compatibility in hydrogen environments, crack tolerance, leakage rate, and fatigue resistance. Therefore, it is necessary to provide a non-metallic hydrogen pipeline that meets the requirements of high-barrier, high-pressure hydrogen transportation. Summary of the Invention

[0007] In order to solve the above problems, the utility model provides a high-barrier high-pressure hydrogen transport polyethylene composite pipe. The plastic product has a simple structure, is easy to manufacture, and has high mechanical properties.

[0008] The utility model provides the following technical solutions:

[0009] A high-barrier, high-pressure hydrogen transport polyethylene composite pipe comprises, from the inside to the outside, a polyethylene plastic inner pipe layer, a continuous fiber prepreg tape reinforced core layer, and a polyethylene plastic outer layer. The continuous fiber prepreg tape reinforced core layer is formed by hot-melting and fusion-bonding continuous fiber prepreg tapes that are staggeredly wound left and right along the axial direction of the inner pipe at a set angle α and fully cover the polyethylene plastic inner pipe layer. The continuous fiber prepreg tape reinforced core layer is formed by melt-bonding three layers at different winding angles to form a structural monomer, and multiple structural monomers are melt-bonded to form a reinforcement layer.

[0010] Furthermore, the structural monomer of the continuous fiber prepreg tape is formed by melt-bonding three layers with different winding angles, the spiral winding angle α of the first layer is 15° to 25°; the spiral winding angle α of the second layer is 65° to 75°, and the spiral winding angle α of the third layer is 50° to 60°.

[0011] Furthermore, the polyethylene plastic inner tube layer includes an inner layer of polyethylene, adhesive, aluminum foil, adhesive, and an outer layer of polyethylene, and the aluminum foil is combined with the inner and outer layers of polyethylene through the adhesive.

[0012] Furthermore, the aluminum foil is wound on the inner layer of polyethylene at a set angle of 65° to 75° to the axial direction of the pipe, and the overlap between the aluminum foils is 5-10 mm, and the thickness of the aluminum foil ranges from 0.15 mm to 1.0 mm.

[0013] Furthermore, the diameter of the composite pipe is not greater than 1200 mm.

[0014] Furthermore, the continuous fiber tape of the continuous fiber prepreg tape reinforced core layer is a thermoplastic continuous fiber prepreg tape, and the thermoplastic continuous fiber prepreg tape is a glass fiber prepreg tape, a basalt fiber tape, an aramid tape, a carbon fiber tape, an ultra-high molecular weight fiber tape or a polyethylene fiber tape.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] The utility model has a three-layer composite pipe body with high rigidity, high tensile strength and high compressive strength, consisting of a polyethylene plastic inner pipe layer, a continuous fiber prepreg tape reinforced core layer and a polyethylene plastic outer layer. The continuous fiber tape reinforced core layer with different winding angles bears the combined stress of the axial tension and circumferential pressure of the composite pipe, or bears it jointly with the inner and outer plastic pipes.

[0017] 1. The utility model has a reasonable structure, is easy and quick to manufacture, is highly practical, and is suitable for popularization and use;

[0018] 2. The pipe of this utility model has high rigidity and high flexibility and can withstand external pressure load;

[0019] 3. The utility model uses aluminum foil as a high barrier material to prevent hydrogen from penetrating and leaking into the composite pipe;

[0020] 4. The fiber of the utility model is wound at different angles to achieve the advantages of high rigidity, high tensile strength and high compressive strength of the composite pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the utility model;

[0022] Figure 2 It is a three-dimensional diagram of the utility model;

[0023] Figure 3 This is a diagram showing the winding angle of the continuous fiber prepreg tape reinforced core layer of the present invention.

[0024] In the figure: 1. Polyethylene plastic inner tube layer, 11. Inner polyethylene layer, 12. Adhesive, 13. Aluminum foil, 14. Adhesive, 15. Outer polyethylene layer; 2. Continuous fiber prepreg tape reinforced core layer; 3. Polyethylene plastic outer layer. Implementation Method

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] See also Figure 1-3 The utility model is a high barrier high pressure hydrogen transport polyethylene composite pipe, such as Figure 1 As shown, from inside to outside, there is a polyethylene plastic inner tube layer 1, a continuous fiber prepreg tape reinforced core layer 2, and a polyethylene plastic outer layer 3. The continuous fiber prepreg tape reinforced core layer 2 is made by hot-melting continuous fiber prepreg tapes, which are interlaced and wrapped around the inner tube at a set angle α, and fully covered on the polyethylene plastic inner tube layer 1. The diameter of the composite pipe is no more than 1200mm.

[0027] The continuous fiber prepreg tape reinforced core layer is formed by melting and bonding three layers at different winding angles to form a structural monomer, and multiple structural monomers are melt-bonded to form a reinforcement layer.

[0028] The structural unit of a continuous fiber prepreg tape is formed by melt-bonding three layers with different winding angles. The spiral winding angle α of the first layer is 15° to 25°; the spiral winding angle α of the second layer is 65° to 75°; and the spiral winding angle α of the third layer is 50° to 60°.

[0029] The inner tube layer is a five-layer inner tube consisting of an inner polyethylene layer 11, an adhesive 12, an aluminum foil 13, an adhesive 14, and an outer polyethylene layer 15. The aluminum foil 13 is integrated with the inner and outer polyethylene layers through the adhesives 12 and 14.

[0030] The aluminum foil 13 is wound on the inner polyethylene layer 11 at a set angle of 65° to 75° with the axial direction of the pipe, and the overlap between the aluminum foils is 5-10 mm. The thickness of the aluminum foil ranges from 0.15 mm to 1.0 mm.

[0031] The continuous fiber prepreg tape reinforced core layer 2 is a thermoplastic continuous fiber prepreg tape, which is a glass fiber prepreg tape, a basalt fiber tape, an aramid tape, a carbon fiber tape, an ultra-high molecular weight fiber tape or a polyethylene fiber tape.

[0032] The polyethylene plastic inner tube layer 1 and the polyethylene plastic outer layer 3 are formed by extruding and coating polyethylene plastic using an extruder.

[0033] This utility model features a three-layer composite pipe body with high rigidity, high tensile strength, and high compressive strength, consisting of a polyethylene plastic inner pipe layer 1, a continuous fiber prepreg tape reinforced core layer 2, and a polyethylene plastic outer layer 3. The continuous fiber tape reinforced core layer, wound at different angles, bears the combined stress of axial tension and hoop pressure in the composite pipe, or jointly with the inner and outer plastic pipe layers.

[0034] Hoop load (stress): The hoop stress caused by internal pressure is borne by the continuous fiber belt layer spirally wound at 65° to 75°, with a design safety factor of 5.

[0035] Axial load (stress) of spiral winding: The axial stress caused by internal pressure or the axial stress caused by uneven sinking during manufacturing and transportation and after burial is borne by the continuous fiber tape layer spirally wound at 15° to 25°, and reinforced by the continuous fiber tape layer spirally wound at 50° to 60°.

[0036] External pressure load: The structure adopts fiber belt layers with different winding angles. The pipe has high rigidity and high flexibility and can withstand external pressure load (such as underground laying).

[0037] The inner and outer layers are made of thermoplastic plastic, aluminum foil and adhesive to form a multi-layer inner tube, which effectively prevents gas from escaping.

[0038] Experimental measurements show that the high pressure of the pipeline system of this application is 1.6MPa to 70MPa, which meets the comprehensive mechanical requirements of axial tension and annular pressure for diameters not greater than 1200mm.

[0039] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-barrier, high-pressure hydrogen transport polyethylene composite pipe, characterized by: From the inside to the outside, the polyethylene plastic inner tube layer (1), the continuous fiber prepreg tape reinforced core layer (2), and the polyethylene plastic outer layer (3) are arranged in order. The continuous fiber prepreg tape reinforced core layer (2) is formed by hot-melting the continuous fiber prepreg tape along the axial direction of the inner tube at a set angle α in a staggered manner and fully covering the polyethylene plastic inner tube layer (1). The continuous fiber prepreg tape reinforced core layer (2) is formed by melt-bonding three layers at different winding angles to form a structural monomer, and multiple structural monomers are melt-bonded to form a reinforcement layer.

2. The high-barrier, high-pressure hydrogen transport polyethylene composite pipe according to claim 1, characterized in that: The structural monomer of the continuous fiber prepreg tape is formed by melt-bonding three layers with different winding angles. The spiral winding angle α of the first layer is 15° to 25°; the spiral winding angle α of the second layer is 65° to 75°; and the spiral winding angle α of the third layer is 50° to 60°.

3. The high-barrier, high-pressure hydrogen transport polyethylene composite pipe according to claim 1, characterized in that: The polyethylene plastic inner tube layer (1) comprises an inner polyethylene layer (11), an adhesive (12), an aluminum foil (13), an adhesive (14), and an outer polyethylene layer (15). The aluminum foil (13) is integrated with the inner and outer polyethylene layers through the adhesive (12) and the adhesive (14).

4. The high-barrier, high-pressure hydrogen transport polyethylene composite pipe according to claim 3, characterized in that: The aluminum foil (13) is wound on the inner layer of polyethylene (11) at a set angle of 65° to 75° with the axial direction of the pipe, and the overlap between the aluminum foils is 5-10 mm, and the thickness of the aluminum foil ranges from 0.15 mm to 1.0 mm.

5. The high-barrier, high-pressure hydrogen transport polyethylene composite pipe according to claim 1, characterized in that: The diameter of the composite pipe is not greater than 1200 mm.

6. The high-barrier, high-pressure hydrogen transport polyethylene composite pipe according to claim 1, characterized in that: The continuous fiber tape of the continuous fiber prepreg tape reinforced core layer (2) is a thermoplastic continuous fiber prepreg tape, and the thermoplastic continuous fiber prepreg tape is a glass fiber prepreg tape, a basalt fiber tape, an aramid tape, a carbon fiber tape, an ultra-high molecular weight fiber tape or a polyethylene fiber tape.

Images