WO2023137968A1

WO2023137968A1 - Hydrogen and natural gas mixed energy transmission pipeline and preparation method therefor

Info

Publication number: WO2023137968A1
Application number: PCT/CN2022/100128
Authority: WO
Inventors: 刘跃明; 金崇阳; 陈江慧; 褚展鹏; 霍福磊
Original assignee: 临海伟星新型建材有限公司
Priority date: 2022-01-24
Filing date: 2022-06-21
Publication date: 2023-07-27
Also published as: CN114484098A; CN114484098B

Abstract

Disclosed are a hydrogen and natural gas mixed energy transmission pipeline and a preparation method therefor. The transmission pipeline sequentially comprises, from inside to outside, a hydrogen transmission layer, a first barrier layer, a first protective layer, a reinforcing layer, a second protective layer, a natural gas transport layer, a second barrier layer, and a third protective layer; support bars are provided in the natural gas transport layer; the support bars are used for maintaining the shape of a transport cavity of the natural gas transport layer; the width of the support bars is 5-7 mm; the ratio of the number of support bars to the inner diameter of a pipe of the natural gas transport layer is 1:15; the unit of the inner diameter is mm, the number of support bars is an integer; the thickness of the support bars is consistent with the thickness of the cavity of the natural gas transport layer; the support bars are helical. The pipeline of the present invention can transport hydrogen and natural gas in a mixed manner, so that transmission efficiency and simplicity are improved, the service life is long, and high-pressure transmission is met.

Description

Hydrogen and natural gas mixed energy transmission pipeline and preparation method thereof

technical field

The invention belongs to the technical field of gas transmission pipelines, in particular to a hydrogen and natural gas mixed energy transmission pipeline.

Background technique

There are many sources of hydrogen energy, and it is an environmentally friendly energy source. Natural gas is a relatively clean energy source, but the mining area and the centralized gas consumption area are generally far away, and natural gas needs to be transported to the user area over a long distance. Hydrogen has huge potential as an energy source. The country is starting to develop hydrogen energy. High-pressure gaseous hydrogen transportation is the most mature hydrogen energy transportation method at this stage, but hydrogen transportation costs are relatively high, and the price of hydrogen transportation pipes is more than twice that of natural gas pipelines. Conventional hydrogen pipelines are steel pipelines. Due to the extremely small molecular weight of hydrogen, it is easy to enter the lattice of many metals, causing hydrogen embrittlement and destroying the pipeline. In addition to hydrogen embrittlement, there is a greater possibility of leakage. Therefore, the steel pipe material used to transport hydrogen is a special material, such as Monel alloy, which is an alloy made of nickel as the base and copper, iron, manganese and other elements. The transformation of natural gas pipelines into hydrogen pipelines is being carried out in the world. However, due to the differences in materials between natural gas pipelines and hydrogen pipelines, hydrogen is flammable, explosive and prone to hydrogen embrittlement. The blending of natural gas and hydrogen is controversial and has unknown risk factors.

Conventional pipelines can only transport a single medium, and the utilization efficiency is low under the background of high-speed development, high demand for resources and land utilization; commonly used pipelines are steel pipes, which are prone to hydrogen embrittlement when transporting hydrogen, and the pipelines are severely damaged; there is a big difference between natural gas pipelines and hydrogen pipelines, and the risk of hydrogen transmission by natural gas pipelines is relatively high; natural gas and hydrogen blending and transportation and hydrogen separation processes are complex and inconvenient to operate.

Contents of the invention

In order to solve the above problems, the object of the present invention is to provide a hydrogen and natural gas mixed energy transmission pipeline, which uses one pipeline to transport hydrogen and natural gas.

In order to achieve the above object, the following technical solutions are proposed:

A hydrogen and natural gas mixed energy transmission pipeline, the transmission pipeline sequentially includes a hydrogen transmission layer, a first barrier layer, a first protective layer, a reinforcement layer, a second protective layer, a natural gas transmission layer, a second barrier layer and a third protective layer from the inside to the outside, the natural gas transmission layer is provided with support bars, the support bars are used to maintain the shape of the transmission cavity of the natural gas transmission layer, the width of the support bars is 5-7mm, the ratio of the number of support bars to the inner diameter of the natural gas transmission layer pipe is 1:15, and the unit of the inner diameter is mm. The thickness of the layer cavity is uniform, and the support bar is helical.

Further, the material of the hydrogen transmission layer is polyethylene, polypropylene, polytetrafluoroethylene or polyamide, the material of the natural gas transmission layer is short glass fibers, inorganic fillers or polyester filament-reinforced composite materials, and the matrix of the polyester filament-reinforced composite material is the same as the material of the hydrogen transmission layer.

Further, the materials of the first protective layer, the second protective layer and the third protective layer are the same as the hydrogen transmission layer, the reinforcement layer is a glass fiber prepreg tape, the first barrier layer is an aluminum tape, and the material of the second barrier layer is EVOH.

A method for preparing a pipeline for hydrogen and natural gas mixed energy transmission, comprising the following steps:

1) The aluminum strip is uncoiled, spliced and stored through the unwinding machine, splicing machine and storage bin. The aluminum half-pipe is formed by the rolling wheel forming machine on the welding platform. The aluminum half-pipe is heated to 200-220°C by a heater, and then enters the inner pipe head to sizing and seams.

2) The hydrogen transmission layer raw materials, hot melt adhesive and first protective layer raw materials are heated and extruded by the screw extruder at a processing temperature of 195-205°C. The inner tube head extrudes hot melt adhesive on the inner wall of the aluminum tube as the first adhesive resin layer, and extrudes the hydrogen transfer layer on the inner wall of the first adhesive resin layer. The extrusion temperature is 190-200°C. At the same time, blow out compressed air to expand and press the hydrogen transfer layer. In the mold of the hot melt adhesive extruder, extrude hot melt adhesive on the outer surface of the aluminum tube as the second bonding resin layer, and then enter the first protective layer extruder to extrude the first protective layer raw materials, adjust the size of each layer and the outer surface morphology by adjusting the screw extrusion volume, traction speed and vacuum degree to ensure smooth surface;

3) After the first protective layer is extruded and adjusted, enter the winding unit, use the drying gun to heat the glass fiber prepreg tape, the glass fiber prepreg tape is glued with resin, and after the resin is melted, it is bonded to the outer surface of the first protective layer. As a reinforcement layer, two sets of winding units are respectively wound in clockwise and counterclockwise directions, and the winding angle is 30-60°;

4) After the winding is completed, the raw material of the second protective layer is extruded through the screw extruder and coated on the reinforcing layer. After the coating is completed, it enters the oven to increase the temperature of the second protective layer. The support bar and the natural gas transmission layer are extruded through the same extruder. The raw material passes through the die head and the shaping cooling mold, so that the support bar and the natural gas transmission layer are integrally formed. Shape setting, the material of the second protective layer and the support bar are the same material, further enhancing the bonding effect between the two;

5) Enter the three-layer co-extrusion die, extrude hot melt adhesive and EVOH through the three-layer co-extrusion die, and form a pipe body with a vacuum sizing sleeve. From the inside to the outside, there are the third bonding resin layer, the second barrier layer and the fourth bonding resin layer. Finally, the raw material of the third protective layer is extruded for coating. After the coating is completed, the tube body enters the tractor and cutting machine to form a finished tube.

Further, the thickness ratio of the hydrogen transport layer, the first adhesive resin layer, the first barrier layer, the second adhesive resin layer and the first protective layer from the inside to the outside is 5:0.5:2:0.5:2.

Further, after the coating of the second protective layer in step 4), enter the oven, and increase the temperature of the second protective layer to 120-130°C.

Further, the temperature of the drying gun in step 3) is 250-270°C, and there is a certain distance between the drying gun and the prepreg tape, so that the temperature of the prepreg tape is stable at 130-140°C.

The beneficial effects of the present invention are: the pipeline of the present invention can mix and transport hydrogen and natural gas, improve the transmission efficiency and simplicity, have a long service life, and meet high-pressure transmission. Risk of damage to materials between the natural gas transport layer and the hydrogen transport layer.

Description of drawings

Fig. 1 is a structural representation of the present invention;

In the figure: 1, hydrogen transmission layer; 2, first adhesive resin layer; 3, first barrier layer; 4, first protective layer; 5, reinforcement layer; 6, second protective layer; 7, natural gas transmission layer; 8, second barrier layer; 9, third protective layer; 10, support bar;

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but the protection scope of the present invention is not limited thereto.

As shown in Figure 1, a hydrogen and natural gas mixed energy transmission pipeline includes a hydrogen transmission layer 1, a first barrier layer 3, a first protective layer 4, a reinforcement layer 5, a second protective layer 6, a natural gas transport layer 7, a second barrier layer 8, and a third protective layer 9 from inside to outside. A support bar 10 is provided in the natural gas transport layer 7, and the shape of the transport cavity is maintained through the support bar 10.

1) The aluminum strip is uncoiled, spliced and stored through the unwinding machine, splicing machine and storage bin, and then passed through the rolling wheel forming machine on the welding platform to become an aluminum half pipe. The aluminum half pipe is heated to 210°C by a heater, and then enters the inner pipe head.

2) Hydrogen transmission layer 1 raw material polyethylene, hot melt adhesive, and first protective layer 4 raw material polyethylene are heated and extruded through a dryer, a meter weight meter to a screw extruder, and the processing temperature is 200°C. The inner pipe head extrudes hot melt adhesive on the inner wall of the aluminum tube as the first adhesive resin layer 2, and extrudes the hydrogen transmission layer 1 raw material on the inner wall of the first adhesive resin layer 2. The extrusion temperature is 190°C. At the same time, compressed air is blown out to expand and press the hydrogen transmission layer 1. Then enter the mold of the hot-melt adhesive extruder, extrude the hot-melt adhesive on the outer surface of the aluminum tube as the second adhesive resin layer 11, then enter the first protective layer 4 extruder to extrude the first protective layer 4 raw materials, adjust the size and outer surface appearance of each layer by adjusting the screw extrusion volume, traction speed and vacuum degree to ensure smooth surface. The thickness of the first protective layer 4 is 1mm;

3) After the first protective layer 4 is extruded and adjusted, it enters the winding unit and uses a drying gun to heat the glass fiber prepreg tape. The temperature of the drying gun is 263°C, and the temperature of the prepreg tape is stable at 130-140°C. The glass fiber prepreg tape is glued with resin. After the resin is melted, it is bonded to the outer surface of the first protective layer 4. As the reinforcement layer 5, two sets of winding units are wound in clockwise and counterclockwise directions respectively, and the winding angle is 30-60°;

4) After the winding is completed, the raw material polyethylene of the second protective layer 6 is extruded and coated on the reinforcing layer 5 through the raw material screw. After the coating is completed, it enters the oven to raise the temperature of the second protective layer 6 to 125°C. The support bar and the natural gas transmission layer are extruded through the same extruder. Diameter box, forming and rapid cooling and setting;

5) Then extrude hot melt adhesive and EVOH, and form a pipe body through a three-layer co-extrusion die head and a vacuum sizing sleeve. From the inside to the outside, there are the third adhesive resin layer 12, the second barrier layer 8 and the fourth adhesive resin layer 13. Finally, the third protective layer 9 is extruded for coating. The raw material of the third protective layer 9 is polyethylene. After the coating is completed, the pipe body enters a tractor and a cutting machine to form a finished tube.

The nominal outer diameter of the finished pipe is 110mm, the inner diameter is 55mm, the thickness of the natural gas transmission layer 7 is 20mm, the number of layers of glass fiber prepreg tape is 4 layers, the thickness of the first barrier layer 3 is 1mm, the thicknesses of the hydrogen transmission layer 1 and the first protective layer 4 are 2.5mm and 1mm respectively, the ring stiffness is ≥150KN/m ² , and the burst strength is ≥23MPa.

Claims

A hydrogen and natural gas mixed energy transmission pipeline, characterized in that the transmission pipeline comprises a hydrogen transmission layer (1), a first barrier layer (3), a first protection layer (4), a reinforcement layer (5), a second protection layer (6), a natural gas transmission layer (7), a second barrier layer (8) and a third protection layer (9) from the inside to the outside, and the natural gas transmission layer (7) is provided with a support bar (10). The ratio of the number of support strips (10) to the inner diameter of the natural gas transmission layer (7) pipe is 1:15, the unit of the inner diameter is mm, the number of support strips (10) is an integer, the thickness of the support strips (10) is consistent with the thickness of the cavity of the natural gas transmission layer (7), and the support strips (10) are helical.
A hydrogen and natural gas mixed energy transmission pipeline according to claim 1, wherein the material of the hydrogen transmission layer (1) is polyethylene, polypropylene, polytetrafluoroethylene or polyamide, the material of the natural gas transmission layer (7) is short glass fibers, inorganic fillers or polyester filament reinforced composite materials, and the matrix of the polyester filament reinforced composite material is the same as the material of the hydrogen transmission layer (1).
A hydrogen and natural gas mixed energy transmission pipeline according to claim 2, characterized in that the materials of the first protective layer (4), the second protective layer (6) and the third protective layer (9) are respectively the same as the hydrogen transmission layer (1), the reinforcing layer (5) is a glass fiber prepreg tape, the first barrier layer (3) is an aluminum strip, and the material of the second barrier layer (8) is EVOH.
A method for preparing a hydrogen and natural gas mixed energy transmission pipeline according to claim 3, characterized in that it comprises the following steps:

1) The aluminum strip is uncoiled, spliced and stored through the unwinding machine, splicing machine and storage bin, and then passed through the rolling wheel forming machine on the welding platform to become an aluminum half pipe. The aluminum half pipe is heated to 200-220°C by a heater, and then enters the inner pipe head for sizing and seaming treatment to form an aluminum pipe.

2) The hydrogen transmission layer (1) raw material, hot melt adhesive and the first protective layer (4) are heated and extruded by the screw extruder at a processing temperature of 195-205°C. The inner pipe head extrudes the hot melt adhesive onto the inner wall of the aluminum tube as the first adhesive resin layer (2), and extrudes the hydrogen gas transfer layer (1) onto the inner wall of the first adhesive resin layer (2) at an extrusion temperature of 190-200°C. At the same time, blow out compressed air to expand and apply pressure to the hydrogen transfer layer (1). The pressure of the compressed air is 0- 1MPa, the wind speed is 0.5-2m/s, then enter the mold of the hot melt adhesive extruder, extrude the hot melt adhesive on the outer surface of the aluminum tube as the second adhesive resin layer (11), then enter the first protective layer (4) extruder to extrude the raw material of the first protective layer (4), adjust the size of each layer and the outer surface morphology by adjusting the screw extrusion volume, traction speed and vacuum degree to ensure smooth surface;

3) After the first protective layer (4) is extruded and adjusted, it enters the winding unit and uses a drying gun to heat the glass fiber prepreg tape. The glass fiber prepreg tape is glued with resin. After the resin is melted, it is bonded to the outer surface of the first protective layer (4) as the reinforcement layer (5).

4) After the winding is completed, the raw material of the second protective layer (6) is extruded through the screw extruder and coated on the reinforcing layer (5). After the coating is completed, it enters the oven to increase the temperature of the second protective layer (6). Bonding, adjusting the screw speed and the controllable nut of the mold to adjust the size of the natural gas transport layer (7), passing through the mold and cooling calibrating box, forming and rapidly cooling and setting;

5) Enter the three-layer co-extrusion die, extrude hot melt adhesive and EVOH through the three-layer co-extrusion die, and form a pipe body with a vacuum sizing sleeve. From the inside to the outside, it is the third bonding resin layer (12), the second barrier layer (8) and the fourth bonding resin layer (13). Finally, the raw material of the third protective layer (9) is extruded for coating. After the coating is completed, the tube body enters the tractor and cutting machine to form a finished tube.
The preparation method of hydrogen and natural gas mixed energy transmission pipeline according to claim 1, characterized in that the thickness ratio of the hydrogen transmission layer (1), the first bonding resin layer (2), the first barrier layer (3), the second bonding resin layer (11) and the first protective layer (4) from inside to outside is 5:0.5:2:0.5:2.
The preparation method of hydrogen and natural gas mixed energy transmission pipeline according to claim 4, characterized in that, in step 4), after the second protective layer (6) is coated, it enters an oven to increase the temperature of the second protective layer (6) to 120-130°C.
The method for preparing hydrogen and natural gas mixed energy transmission pipeline according to claim 4, characterized in that the temperature of the drying gun in step 3) is 250-270°C, and there is a certain distance between the drying gun and the prepreg tape, so that the temperature of the prepreg tape is stable at 130-140°C.