Sealing ring for hydrogen pipeline with integrated storage and transportation

Abstract

The utility model provides a kind of storage and transportation integrated hydrogen pipeline sealing ring, including annular sealing ring with the hollow layer size of hydrogen pipeline is matched, and several groups of sealing plug and plug are distributed equidistantly along circumference on annular sealing ring front and back, and the number and size of sealing plug are matched with the hollow pipe of hydrogen pipeline, and hollow pipe is inserted into sealing hollow pipe;The plug is inserted into the hollow layer of hydrogen pipeline, so that sealing ring is fixed between two hydrogen pipelines.The utility model can realize the close sealing of hydrogen transmission channel between adjacent hydrogen pipeline of composite material storage and transportation integrated hydrogen pipeline, and hollow pipe can be sealed simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen energy transportation, specifically a sealing ring for an integrated hydrogen storage and transportation pipeline. Background Technology

[0002] As a clean and efficient secondary energy source, hydrogen energy transportation is a crucial link in the hydrogen industry chain (hydrogen production, transportation, storage, and utilization), directly affecting its economic viability, safety, and large-scale application. The physicochemical properties of hydrogen (such as low density, high diffusivity, and flammability) make its transportation methods significantly different from traditional fossil fuels, necessitating the selection of appropriate technological routes based on hydrogen's form, transportation distance, and usage requirements.

[0003] Hydrogen energy transportation faces multiple technical and engineering challenges, which determine the unique characteristics of its transportation mode: Low density characteristics: Gaseous hydrogen has an extremely low energy density (approximately 0.09 kg / m³ under standard conditions), resulting in low transportation efficiency. It is necessary to increase the energy density through compression, liquefaction, or carrier forms.

[0004] High diffusivity and flammability: Hydrogen molecules are small and have a high diffusion coefficient, making them prone to leakage; in addition, hydrogen has a wide combustion range (4%-75% volume concentration) and low ignition energy, so the risk of leakage must be strictly controlled during transportation.

[0005] Material compatibility: Hydrogen may cause "hydrogen embrittlement" in metallic materials under high pressure or high temperature, reducing the strength of equipment. Therefore, hydrogen embrittlement resistant materials (such as austenitic stainless steel, aluminum alloy, etc.) should be selected.

[0006] Energy consumption and cost: Compressing or liquefying hydrogen requires a large amount of energy (such as liquefaction, which consumes about 30%-40% of hydrogen's energy), and the cost of specialized transportation equipment is high, which drives up the end-use price of hydrogen.

[0007] The main existing methods of hydrogen energy transportation: Based on the physical state of hydrogen, hydrogen energy transportation can be divided into three main categories: gaseous hydrogen transportation, liquid hydrogen transportation, and hydrogen carrier transportation. Each type of transportation has different applicable scenarios and technical characteristics.

[0008] 1. Gaseous hydrogen transport (GH2 Transport) Gaseous hydrogen transportation is currently the most mature and widely used method. It involves storing hydrogen in high-pressure containers through compression and is suitable for short to medium distance (usually ≤1000 km) and small to medium-scale transportation.

[0009] Technical principle: Hydrogen gas is compressed to a high pressure (common pressures are 20MPa, 30MPa or 45MPa), stored in a special high-pressure container, and transported by road, rail or pipeline.

[0010] Main forms: High-pressure gaseous road transport: using on-board high-pressure hydrogen storage tanks (such as long-tube trailers), a single vehicle can carry approximately 300-500 kg of hydrogen (at 45 MPa). It is highly flexible and suitable for point-to-point delivery, but the transportation efficiency is low and the cost increases significantly with distance.

[0011] High-pressure gaseous pipeline transportation: High-pressure gaseous hydrogen is transported through dedicated pipelines. It has high transportation efficiency and low cost, and is suitable for large-scale, long-distance transportation (such as pipelines connecting hydrogen production plants and hydrogen refueling stations). However, the initial investment in pipeline construction is large, and a network effect needs to be formed.

[0012] Advantages and disadvantages: Advantages: Mature technology, low equipment cost, and strong adaptability.

[0013] Disadvantages: Low energy density (low transportation efficiency), high cost of long-distance transportation, and pipelines rely on infrastructure construction.

[0014] 2. Liquid hydrogen transportation (LH2 Transport) Liquid hydrogen transport, by liquefying hydrogen (cooling it to -253°C) to increase its energy density, is suitable for long-distance, large-scale transportation, especially for cross-regional or cross-border transportation.

[0015] 3. Hydrogen Carrier Transport Hydrogen carrier transportation involves combining hydrogen with other substances to form stable compounds (such as ammonia, methanol, organic liquids, etc.), transporting them to their destination, and then releasing hydrogen through a dehydrogenation reaction. This method is suitable for ultra-long-distance, intercontinental transportation, and is especially suitable for scenarios lacking direct hydrogen transportation infrastructure.

[0016] To promote the widespread use of hydrogen energy, constructing a large-scale, long-distance hydrogen pipeline network using high-pressure gaseous pipelines is the most feasible approach. Existing domestic hydrogen pipelines use carbon steel pipes with anti-corrosion coatings, with a maximum diameter of 20cm and a maximum pressure resistance of 6.3mPa and a flow velocity of <8m / s. The EU currently uses ceramic composite materials for its hydrogen pipelines, which can withstand a maximum pressure of 10mPa. However, ceramic pipes are prone to cracking on their inner walls after prolonged use, affecting their lifespan.

[0017] To increase the diameter, flow rate, and maximum pressure of hydrogen pipelines, fiber composite materials can be chosen as alternatives to metal pipes. However, since the thermal conductivity of composite materials is significantly lower than that of metal pipes, hollow tubes need to be added within the pipeline to ensure heat dissipation when increasing the hydrogen flow rate and maximum pressure. A key technical challenge is simultaneously ensuring the sealing of the hydrogen transport channel and the plugging of the hollow tubes when sealing adjacent pipeline connections. Utility Model Content

[0018] To address the problems of existing technologies, this invention provides a sealing ring for an integrated hydrogen storage and transportation pipeline. This ring can achieve a tight seal between adjacent pipelines in a composite material integrated hydrogen storage and transportation pipeline, and can also simultaneously seal hollow pipes.

[0019] This utility model provides a sealing ring for an integrated hydrogen storage and transportation pipeline, including an annular sealing ring that matches the size of the hollow layer of the hydrogen transportation pipeline. The annular sealing ring has several sets of sealing plugs and plugs evenly distributed along the circumference on both sides. The number and size of the sealing plugs match the hollow tube of the hydrogen transportation pipeline and are inserted into the hollow tube to seal the hollow tube. The plugs are inserted into the hollow layer of the hydrogen transportation pipeline to fix the sealing ring between two hydrogen transportation pipelines.

[0020] In a further improvement, each group of sealing plugs has three plugs arranged in parallel.

[0021] The beneficial effects of this utility model are as follows: 1. It can achieve tight sealing of hydrogen transmission channels between adjacent pipelines in the integrated hydrogen storage and transportation pipeline of composite materials, and can also seal the hollow pipe at the same time.

[0022] 2. To complement the hollow tube structure in the integrated hydrogen storage and transportation pipeline, three parallel plugs are used. During sealing, the a and b tubes of the adjacent hollow tubes are cross-connected and sealed through the plugs, thereby improving the tightness and sealing performance of the pipeline connection. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of an integrated hydrogen storage and transportation pipeline structure.

[0025] Figure 2 This is a schematic diagram of the sealing ring structure.

[0026] Figure 3 This is a schematic diagram illustrating the working state of two hydrogen transport pipelines sealed by a sealing ring. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0028] This utility model provides an integrated hydrogen storage and transportation pipeline sealing ring, specifically for hydrogen transportation pipelines such as... Figure 1 As shown, the structure includes, from the inside out, a hydrogen transport channel 1, an inner wall layer 2, a hollow layer 3, and a winding layer 4. The inner wall layer is a ceramicized fiber layer, and the hollow layer contains a plurality of hollow tubes 5. The plurality of hollow tubes are divided into several groups, and each group of hollow tubes is equidistantly distributed along the circumference within the hollow layer. Each group of hollow tubes includes tubes a and b connected side by side.

[0029] The sealing ring provided by this utility model includes an annular sealing ring that matches the size of the hollow layer of the hydrogen transport pipeline. The annular sealing ring has several sets of sealing plugs and plugs evenly distributed along the circumference on both sides. The number and size of the sealing plugs match the hollow tube of the hydrogen transport pipeline and are inserted into the hollow tube to seal the hollow tube. The plugs are inserted into the hollow layer of the hydrogen transport pipeline to fix the sealing ring between the two hydrogen transport pipelines.

[0030] For the structure of pipes a and b of the hydrogen transport pipeline, each group of sealing plugs has three plugs arranged in parallel. This is used to seal the two sections of the hydrogen transport pipeline as follows: Figure 3 As shown.

[0031] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on its differences from other embodiments. In particular, for the device embodiments, the above descriptions are merely preferred embodiments of this utility model. Since they are fundamentally similar to the method embodiments, the descriptions are relatively simple; relevant parts can be referred to the descriptions of the method embodiments. The above descriptions are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model, without departing from the principle of this utility model, should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A sealing ring for an integrated hydrogen storage and transportation pipeline, characterized in that: It includes an annular sealing ring that matches the size of the hollow layer of the hydrogen transport pipeline. The annular sealing ring has several sets of sealing plugs and plugs evenly distributed along the circumference on both sides. The number and size of the sealing plugs match the hollow tube of the hydrogen transport pipeline and are inserted into the hollow tube to seal the hollow tube. The plugs are inserted into the hollow layer of the hydrogen transport pipeline to fix the sealing ring between the two hydrogen transport pipelines.

2. The sealing ring for the integrated hydrogen storage and transportation pipeline according to claim 1, characterized in that: Each of the aforementioned groups of sealing plugs has three plugs arranged side by side.

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