Three-core mixed transport low-temperature resistant energy pipeline and multiple low-temperature medium collection methods

Abstract

The application belongs to the technical field of energy pipeline and provides a kind of three-core mixed transport ocean low-temperature resistant energy pipeline and a variety of low-temperature medium collection methods.The energy pipeline mainly includes three-core corrugated pipe layers, heat insulation protective layers, inner sheath layers, first tensile armor layers, first wear-resistant layers, second tensile armor layers, second wear-resistant layers, thermal insulation layers and outer sheath layers from inside to outside; all the structure layers from inside to outside are coaxial, uniform and closely arranged.The application combines the three-core mixed transport pipeline with the collection method, utilizes the independent channel design of the three-core corrugated pipe layers to realize the parallel transport of three kinds of low-temperature medium, dynamically adjusts the flow by real-time monitoring of temperature, pressure, flow rate and other phase state parameters, ensures the phase state stability and flow balance of multiple media in complex marine environment, avoids the vaporization of multiple media in the transport process to reduce the transport efficiency, significantly improves the efficiency of deep-sea multiple medium transport, and greatly reduces the operation and maintenance cost.

Description

Technical Field

[0001] This invention relates to the field of energy pipeline technology, and in particular to a three-core hybrid transmission marine cryogenic energy pipeline and various cryogenic medium collection methods. Background Technology

[0002] The ocean contains abundant oil and gas resources, with over 70% of these resources located in deep-sea areas. In recent years, with the increasing demand for oil and gas resources, deep-sea areas have gradually become development hotspots, possessing considerable development potential. In practical applications, natural gas is typically transported by sea in liquid form, known as liquefied natural gas (LNG); liquid carbon dioxide (L-CO2) and liquid hydrogen (LH2) can also be directly extracted at sea during oil and gas extraction. Generally, the operation and maintenance costs of offshore energy pipelines are relatively high, and the safety risks are relatively significant. Considering that all three media mentioned above need to remain liquid in a cryogenic environment for transportation, using a single cryogenic pipeline to simultaneously transport these three cryogenic media can greatly improve transportation efficiency and reduce operation and maintenance costs.

[0003] In summary, existing technologies lack an integrated solution that can safely and efficiently transport liquefied natural gas, liquid carbon dioxide, and liquid hydrogen simultaneously within a single pipeline. They also cannot maintain the stability of the cryogenic liquid phase of each of the three media under harsh sea conditions in the deep ocean, resulting in low transportation efficiency and high operation and maintenance costs. Summary of the Invention

[0004] Therefore, one objective of this invention is to propose a three-core hybrid transmission marine cryogenic energy pipeline and a method for collecting various cryogenic media, in order to solve the problems mentioned in the background art and overcome the shortcomings of the existing technology.

[0005] To achieve the above objectives, the present invention provides a three-core hybrid transmission marine cryogenic energy pipeline, comprising:

[0006] A heat insulation protective layer is provided, which covers each corrugated pipe layer.

[0007] An inner sheath layer, which encloses the corrugated pipe layer and the heat insulation protective layer to form an integral core structure;

[0008] The first tensile armor layer is spirally wound around the outer wall of the inner sheath layer;

[0009] The first wear-resistant layer covers the outer wall of the first tensile armor layer;

[0010] The second tensile armor layer is spirally wound around the outer wall of the first wear-resistant layer;

[0011] The second anti-wear layer, which is wrapped around the outer wall of the second tensile armor layer;

[0012] The insulation layer, which is arranged on the outer circumferential surface of the second anti-wear layer;

[0013] The outer sheath layer, which is wrapped around the outside of the insulation layer;

[0014] The corrugated pipe layer is a three-core corrugated pipe layer, which is used to transport the same or multiple different low-temperature media and provide radial support for the entire energy pipeline;

[0015] The three-core corrugated pipe layer includes three identical metal corrugated pipes, and the three metal corrugated pipes are arranged in a "pin" shape.

[0016] Preferably, the energy pipeline further includes:

[0017] The monitoring optical fiber, which is arranged at the central gap of the three-core corrugated pipe layer and is closely adhered to the heat insulation protection layer;

[0018] The filling support layer, which is arranged at the outer gap of the three-core corrugated pipe layer and is closely adhered to the heat insulation protection layer and the inner sheath layer.

[0019] Preferably, the inner diameter of each corrugated pipe is from 30 to 40 mm, and the wall thickness is 0.6 mm; the thickness of the heat insulation protection layer is 10 mm, and the heat insulation protection layer is made of aerogel material; the thickness of the inner sheath layer is 5 mm, and the inner sheath layer is made of high-density polyethylene material.

[0020] Preferably, the filling support layer adopts a special-shaped structure, the shape of which is consistent with the outer gap of the three-core corrugated pipe layer, and is made of a non-metallic material plate with good heat insulation performance.

[0021] Preferably, both the first tensile armor layer and the second tensile armor layer are wound with flat fiber bands longitudinally and transversely intertwined in a twist shape woven by carbon fiber spirally at a spiral angle of 20 to 30°. The winding directions of the first tensile armor layer and the second tensile armor layer are opposite. The width of the flat fiber band is from 40 to 50 mm, the layer thickness is from 1 to 2 mm, and the number of flat fiber bands of the first tensile armor layer and the second tensile armor layer is from 8 to 16, forming a twist-shaped structure through intertwined weaving.

[0022] Preferably, the thicknesses of both the first anti-wear layer and the second anti-wear layer are from 0.5 to 1 mm, and they are made of fiber cloth or polymer materials.

[0023] Preferably, the insulation layer has a thickness of 60-100 mm and is made of aerogel material; the outer sheath has a thickness of 10-20 mm and is made of high-density polyethylene material.

[0024] Preferably, the metal corrugated tube is made of 316L, 304 or 316 stainless steel, with a corrugation height of 12-16 mm and a wave pitch of 8-12 mm; the center of the cross-section of the three-core corrugated tube layer (i.e. the center of the monitoring optical fiber) coincides with the center of the cross-section of the inner sheath layer, and the heat insulation layer, the inner sheath layer, the first tensile armor layer, the first wear-resistant layer, the second tensile armor layer, the second wear-resistant layer, the heat insulation layer and the outer sheath layer are tightly fitted and their cross-sectional centers are coaxial.

[0025] On the other hand, the present invention provides a method for collecting various cryogenic media in deep-sea areas, using the aforementioned three-core hybrid transmission marine cryogenic energy pipeline, comprising:

[0026] The three interfaces of the three-core corrugated pipe layer of the energy pipeline are connected to the interface of the energy processing device. The energy processing device is used to process the mixed energy collected from the ocean and output three energy media, namely liquefied natural gas, liquid carbon dioxide and liquid hydrogen, through the interface. The interface of the energy processing device includes three output ports, which are respectively connected to the three interfaces of the three-core corrugated pipe layer of the energy pipeline.

[0027] The three media—liquefied natural gas, liquid carbon dioxide, and liquid hydrogen—are simultaneously injected into the three-core corrugated pipe layer of the energy pipeline, which then transports these three media in the deep-sea area.

[0028] During the transportation process, the phase parameters of the three media in the three-core corrugated pipe layer of the energy pipeline are monitored in real time, and the output flow rate of the corresponding media at the output port of the energy processing device is dynamically adjusted according to the monitored phase parameters of the three media.

[0029] The phase parameters include: the temperature parameter of the medium, the pressure parameter of the medium, and the flow rate of the medium.

[0030] Preferably, the step of dynamically adjusting the output flow rate of the corresponding medium at the output port of the energy processing device based on the monitored phase parameters of the three media includes:

[0031] The key risk indicators for each medium are determined based on the temperature data of each medium in the three-core corrugated pipe layer.

[0032] Predict the status trend of each medium based on key risk indicators;

[0033] Based on the state trend prediction results, the deviation of key risk indicators is used as the input of the PID controller to generate the latest flow adjustment for each medium.

[0034] The output flow rate of each medium is dynamically adjusted based on the latest flow rate adjustment of each medium.

[0035] Preferably, the prediction of the state trend of each medium based on key risk indicators includes:

[0036] The vaporization risk of each medium is determined based on its saturation pressure difference and a preset risk threshold. If the vaporization risk of any medium is low, the current flow rate is maintained. If the vaporization risk of any medium is high, a state trend prediction is performed for that medium. The state trend prediction for that medium includes:

[0037] The heat flow rate per unit length of the three-core corrugated pipe layer is determined based on the temperature data of the medium in the three-core corrugated pipe layer and the seawater temperature data. The temperature rise rate is determined based on the heat flow rate per unit length and the flow velocity data of the medium. The temperature data of the medium in the future is predicted based on the temperature rise rate. The frictional pressure drop is determined based on the flow velocity data of the medium. Vibration compensation is introduced based on the vibration data of the energy pipeline to determine the predicted total pressure loss. The saturation pressure difference of the medium in the future is determined based on the temperature data of the medium in the future and the predicted total pressure loss.

[0038] The vaporization risk of the medium is determined based on the saturation pressure difference of the medium after a certain period of time and the preset risk threshold. If the vaporization risk of the medium is low, the current flow rate is maintained. If the vaporization risk of the medium is high, the subsequent process is executed.

[0039] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows:

[0040] This invention provides a three-core hybrid marine cryogenic energy pipeline. By employing a three-core corrugated pipe layer as the cryogenic medium transport channel, the triangular arrangement significantly improves the structural stability and safety in the complex and harsh deep-sea environment, effectively reducing the risk of structural failures such as buckling and instability. It can simultaneously and efficiently transport liquefied natural gas, liquid carbon dioxide, and liquid hydrogen, which not only greatly improves energy transport efficiency and reduces operation and maintenance costs, but also achieves full recovery and utilization of liquid carbon dioxide and liquid hydrogen generated during oil and gas extraction. While saving resources, it protects the marine environment and provides a useful reference for the conceptual design of marine flexible pipelines.

[0041] This invention combines a three-core mixed-transmission pipeline structure with a data acquisition method. By utilizing the independent channel design of the three-core corrugated pipe layer, it achieves parallel transport of multiple cryogenic media. By monitoring phase parameters such as temperature, pressure, and flow rate in real time and dynamically adjusting the flow rate, it ensures the phase stability and flow balance of multiple media in complex marine environments. This avoids vaporization of multiple media during the acquisition and transport process, which would reduce transport efficiency. It significantly improves the efficiency of multi-media transport in deep-sea areas, greatly reduces operation and maintenance costs, and achieves energy conservation.

[0042] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0043] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0044] Figure 1 This is a schematic diagram of the cross-sectional structure of a three-core hybrid transmission low-temperature energy pipeline according to the present invention.

[0045] Figure 2 This is a schematic diagram of the cross-sectional structure of another three-core hybrid transmission low-temperature energy pipeline according to the present invention.

[0046] Figure 3 This is a schematic diagram of the overall three-dimensional structure of a three-core hybrid transmission low-temperature energy pipeline according to the present invention.

[0047] Figure 4 This is an axial cross-sectional view of the overall three-dimensional structure of a cryogenic energy pipeline with three-core hybrid transmission according to the present invention.

[0048] Figure 5 This is an axial cross-sectional view of the overall three-dimensional structure of another three-core hybrid transmission low-temperature energy pipeline according to the present invention.

[0049] Figure 6 This is a schematic diagram of the cross-sectional structure of the three-core corrugated pipe layer along the pipe axis of the present invention.

[0050] Figure 7 This is a schematic diagram of the cross-sectional structure of the three-core corrugated pipe layer along the radial direction of the pipe according to the present invention.

[0051] Figure 8 This is a schematic diagram of the cross-sectional structure of the tensile armor layer of the present invention along the axial direction of the pipe.

[0052] Figure 9 This is a schematic diagram of the cross-sectional structure of the tensile armor layer of the present invention along the radial direction of the pipe.

[0053] Figure 10 This is a schematic cross-sectional view of the wear-resistant layer / inner sheath layer / insulation layer / outer sheath layer of the present invention along the radial direction of the pipe.

[0054] Figure 11 This is a schematic cross-sectional view of the wear-resistant layer / inner sheath layer / insulation layer / outer sheath layer of the present invention along the pipe axis.

[0055] Figure 12 This is a schematic diagram of the process for a method of collecting various cryogenic media in deep-sea areas according to the present invention.

[0056] The structure includes: 1. Three-core corrugated tube layer; 2. Thermal insulation layer; 3. Inner sheath layer; 4. First tensile armor layer; 5. First abrasion-resistant layer; 6. Second tensile armor layer; 7. Second abrasion-resistant layer; 8. Thermal insulation layer; 9. Outer sheath layer; 10. Monitoring optical fiber; 11. Filling support layer. Detailed Implementation

[0057] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0058] Natural gas is typically transported by sea in liquid form (liquefied natural gas (LNG)). Liquid carbon dioxide (L-CO2) and liquid hydrogen (LH2) can also be directly extracted during offshore oil and gas extraction. Considering that all three media require maintaining a liquid state at low temperatures for transportation, and that offshore transportation involves relatively high operation and maintenance costs and safety risks, simultaneously transporting these three cryogenic media would significantly improve transportation efficiency and reduce operation and maintenance costs. However, at the basic design stage, there is a lack of a cryogenic energy pipeline capable of simultaneously transporting three cryogenic media in deep-sea areas, suitable for the harsh and complex sea conditions of the deep sea. To address these issues, this invention provides a three-core hybrid cryogenic energy pipeline for marine use and a method for collecting multiple cryogenic media, specifically employing the following approach:

[0059] This invention provides a three-core hybrid transmission low-temperature resistant energy pipeline structure, with reference to... Figure 1 , Figure 3 and Figure 4The system mainly consists of, from the inside out, a three-core corrugated pipe layer 1, a heat insulation layer 2, an inner sheath layer 3, a first tensile armor layer 4, a first wear-resistant layer 5, a second tensile armor layer 6, a second wear-resistant layer 7, a heat insulation layer 8, and an outer sheath layer 9. All structural layers from the inside out are coaxial, uniform, and tightly arranged. The coaxial arrangement includes the center of the three-core corrugated pipe layer 1, the center of the cross-section of the spirally wound inner and outer tensile armor layers, and the center of the cross-section of all other cylindrical structural layers. All structural layers from the inside out are tightly, seamlessly, and non-adhesively bonded to the upper layer. The innermost layer, the three-core corrugated pipe layer 1, provides radial stiffness and a basic framework for the entire pipe. The structural layers are not interlocked, and the inner diameter of each structural layer is set to the outer diameter of the corresponding upper structural layer to facilitate geometric fit.

[0060] Furthermore, referring to Figure 2 and Figure 5 The energy pipeline also includes:

[0061] Monitoring optical fiber 10 is disposed in the central gap of the three-core corrugated tube layer 1 and is tightly attached to the heat insulation protective layer 2.

[0062] A filler support layer 11 is provided at the outer gap of the three-core corrugated pipe layer 1 and is tightly fitted with the heat insulation protection layer 2 and the inner sheath layer 3.

[0063] In one embodiment, the three-core corrugated pipe layer is used to transport the same cryogenic medium, such as liquefied natural gas.

[0064] In one embodiment, the three-core corrugated layer is used to transport two different cryogenic media, such as two corrugated pipes for transporting liquefied natural gas and the other for transporting liquid carbon dioxide and / or liquid hydrogen.

[0065] In one embodiment, the three-core corrugated pipe layer is used to transport three different cryogenic media, such as liquefied natural gas, liquid carbon dioxide, and liquid hydrogen.

[0066] It is understood that the medium transported by the energy pipeline of the present invention has a low temperature. During use, different materials have different coefficients of thermal expansion, which may lead to thermal expansion and contraction. Therefore, during the production of the energy pipeline, the filler support layer 11 is tightly attached to the heat insulation protection layer 2 and the inner sheath layer 3. However, during actual use, a certain gap may be generated between the filler support layer 11 and the heat insulation protection layer 2 and the inner sheath layer 3. Alternatively, during the production of the energy pipeline, a certain gap may be left between the filler support layer 11 and the heat insulation protection layer 2 and the inner sheath layer 3, but during actual use, the filler support layer 11 is tightly attached to the heat insulation protection layer 2 and the inner sheath layer 3. All of these are within the scope of the tight attachment between the filler support layer 11 and the heat insulation protection layer 2 and the inner sheath layer 3 of the present invention.

[0067] In one embodiment, a gap of 0.1 mm to 0.2 mm is left between the filling support layer 11 and the heat insulation protection layer 2, and between the filling support layer 11 and the inner sheath layer 3.

[0068] It is understood that the three-core corrugated pipe layer 1 is the innermost sealed structure, serving as a transport channel for three different low-temperature media; the heat insulation protective layer 2 is tightly arranged on the outer wall of each corrugated pipe layer, providing the first layer of heat insulation for the three-core corrugated pipe layer 1, while preventing friction and damage between the three corrugated pipes. After each corrugated pipe layer is covered with the heat insulation protective layer 2, the three-core structures are tightly arranged together; the inner sheath layer 3 wraps around the outside of the overall three-core corrugated pipe structure, protecting the three-core corrugated pipe... The system is enclosed in a single core structure, with the center of the three-core corrugated pipe layer 1 coinciding with the center of the inner sheath layer 3. The first tensile armor layer 4 is located on the outer circumference of the inner sheath layer 3 and is a key load-bearing structural layer for the entire pipeline. The first anti-wear layer 5 is tightly arranged between the inner and outer tensile armor layers to prevent friction and wear between the tensile armor layers. The second tensile armor layer 6 is located on the outer circumference of the first anti-wear layer 5 and is also a key load-bearing layer for the entire pipeline. The second anti-wear layer 7 is tightly arranged on the outer circumference of the second tensile armor layer 5. The outer wall of the armor layer 6 prevents the second tensile armor layer 6 from abrading and damaging the insulation layer 8; the insulation layer 8 covers the outer circumference of the second anti-wear layer 7, maintaining the low-temperature environment inside the pipe and preventing the low-temperature medium inside the pipe from vaporizing; the outer sheath layer 9 covers the outer circumference of the insulation layer 8, providing waterproofing and anti-wear protection for the pipe; the monitoring optical fiber 10 is located at the center gap of the three-core corrugated pipe layer 1, fitting tightly against each thermal insulation layer, enabling real-time monitoring or transmission of the medium phase parameters of the three-core corrugated pipe layer 1. (e.g., temperature) to achieve real-time monitoring of the efficiency of medium transportation and pipeline health; the filling support layer 11 adopts an irregular structure, and its shape is consistent with the external gap between the three-core corrugated pipe layer 1 and the inner sheath layer 3. It is respectively set at the external gap of the three-core corrugated pipe layer 1, and fits tightly with each heat insulation protection layer 2 and the inner sheath layer 3 of the three-core corrugated pipe layer 1, so as to provide auxiliary radial support for the entire pipeline, and together with the three-core corrugated pipe layer 1, it provides radial support for the entire energy pipeline.

[0069] In one embodiment, the filling support layer 11 is made of a non-metallic material with thermal insulation properties.

[0070] This invention provides a three-core hybrid marine cryogenic energy pipeline structure, capable of simultaneously transporting liquefied natural gas (LNG), liquid carbon dioxide (L-CO2), and liquid hydrogen (LH2). The pipeline utilizes three thin-walled metal corrugated tubes arranged in a triangular pattern inside the pipe to transport the three different cryogenic media, forming a sealed structure for the transported media. An inner sheath layer 3 encases the three corrugated tubes, forming the core structure of the marine cryogenic energy pipeline. Finally, two layers of tensile armor with equal and opposite spiral winding angles are used. The pipeline is provided with axial stiffness to withstand the complex loads of harsh sea conditions in deep-sea areas, forming the load-bearing structure of the marine cryogenic energy pipeline. The thermal insulation protective layer 2 and the heat insulation layer 8 maintain the low-temperature environment inside the pipeline, allowing the cryogenic medium inside the three-core corrugated pipe layer 1 to be transported in liquid form, forming the thermal insulation structure of the marine cryogenic energy pipeline. The filler support layer 11 provides radial support to prevent buckling instability and other problems in the pipeline. The outer sheath layer 9 wraps the entire pipeline structure, forming the protective structure of the marine cryogenic energy pipeline and preventing seawater corrosion.

[0071] As the innermost structure of the three-core hybrid low-temperature energy pipeline, refer to Figure 6 and Figure 7 The three-core corrugated pipe layer 1 consists of three identical thin-walled metal corrugated pipes arranged in a triangular or equilateral triangle pattern, primarily serving as a transport channel for three cryogenic media and providing radial support for the entire pipeline structure. The inner radii of the identical thin-walled metal corrugated pipes are... The wave height of its cross section is determined by the flow requirement of the cryogenic medium and the actual application environment. Wavelength and wall thickness Structural parameters such as the outer radius are determined by the pipeline's working pressure and actual technological level. With average radius inner radius The inner radius of the three-core corrugated pipe layer 1 of the three-core hybrid low-temperature energy pipeline provided by this invention is determined by the aforementioned structural parameter geometric relationship. Set to 15-20mm, wave height Wavelength and wall thickness The thicknesses are set to approximately 12–16 mm, 8–12 mm, and 0.6 mm, respectively. Since the three-core corrugated pipe layer 1 is in direct contact with the low-temperature medium, its material is generally selected from high-strength, low-temperature resistant materials such as 316L stainless steel (304 stainless steel or 316 stainless steel can also be used). Compared with the straight-walled cylindrical structure, the thin-walled corrugated pipe structure has a smaller bending stiffness and bending radius due to the increased extension length of the structure in its unit axial space. Therefore, using the thin-walled metal corrugated pipe structure as the inner lining structure of the three-core mixed transmission low-temperature energy pipeline can achieve better structural flexibility.

[0072] As a crucial load-bearing structure for the three-core hybrid low-temperature energy pipeline, refer to Figure 8 and Figure 9 Both the first tensile armor layer 4 and the second tensile armor layer 6 are spirally wound structures, with the inner sheath layer 3 and its internal structure as the core structure. They are formed by spirally winding the same number of uniformly arranged, composite-woven rectangular cross-section flat fiber tapes around the core structure. The spiral winding angles of the first and second tensile armor layers are equal in magnitude and opposite in direction, ensuring the pipe's bending flexibility while providing axial tensile stiffness. The spiral winding angles of the inner and outer tensile armor layers are... Number of flat fiber strips and the width of the rectangular cross-section of the flat fiber tape. With height (That is, the thickness of the tensile armor layer) is determined by the load required by the actual application environment; the spiral winding angle of the inner and outer tensile armor layers of the three-core hybrid low-temperature energy pipeline provided by this invention Set to 20-30°, number of flat fiber strips Set to 8-16 strands, with the width of the rectangular cross-section of the flat fiber strip. With height (That is, the thickness of the tensile armor layer) is set to 40-50mm and 1-2mm respectively; Since the three-core mixed transmission low-temperature energy pipeline needs to float on the water surface when in operation, taking into account the tensile force it is subjected to, the weight of the material and the economic requirements, the material is generally selected as a lightweight and high-strength non-metallic fiber braided material, which is made of multiple carbon fiber materials spirally woven into a twisted shape and tightly interwoven longitudinally and laterally.

[0073] As the functional layer structure of a three-core hybrid low-temperature energy pipeline, refer to Figure 10 and Figure 11 The heat insulation layer 2, inner sheath layer 3, first wear-resistant layer 5, second wear-resistant layer 7, heat insulation layer 8, and outer sheath layer 9 are all cylindrical structures. Because they have the same structure, they are all... Figure 10 and Figure 11 The cylindrical structure shown is therefore... Figure 10 and Figure 11The structural diagram of the heat insulation protective layer 2, inner sheath layer 3, first wear-resistant layer 5, second wear-resistant layer 7, heat insulation layer 8, and outer sheath layer 9 is unified and will not be described in detail with attached diagrams; Figure 10 middle The inner diameter of the cylindrical structure, The outer diameter is the diameter of the cylindrical structure, and the difference is the thickness of the cylindrical structure, which is the thickness of the heat insulation layer 2, the inner sheath layer 3, the first wear-resistant layer 5, the second wear-resistant layer 7, the heat insulation layer 8, and the outer sheath layer 9, respectively. Figure 10 Parameters in The thermal insulation layer 2 wraps around the outer wall of each corrugated pipe in the three-core corrugated pipe layer 1, providing the first layer of thermal insulation and preventing friction and damage between the three corrugated pipes. Its thickness... The thickness is determined by the geometric parameters of the three-core corrugated pipe layer 1; the inner sheath layer 3 tightly wraps the three-core corrugated pipe layer 1 and its corresponding thermal insulation protective layer 2 into an integral core structure. Similarly, the geometric parameters of the three-core corrugated tube layer 1 are determined; the first anti-wear layer 5 is tightly arranged between the inner and outer tensile armor layers to prevent the two armor layers from rubbing and wearing against each other, and its thickness is determined by the geometric parameters of the three-core corrugated tube layer 1. The thickness is determined by the geometric parameters of the tensile armor layer; the second abrasion-resistant layer 7 is closely arranged on the outer wall of the second tensile armor layer 6 to prevent the second tensile armor layer 6 from abrading the insulation layer 8. Similarly, the tensile armor layer's geometric parameters are determined; the insulation layer 8 is arranged on the outer circumference of the second wear-resistant layer 7, serving to insulate against heat and maintain a low-temperature environment for the liquid medium inside the pipe, and its thickness... The thickness of the outer sheath is determined by the pipe's inner diameter, internal temperature, and external temperature. The outermost layer consists of nine rows, protecting the entire pipe and preventing seawater corrosion. The thickness is determined by the actual application environment. The thermal insulation layer 2 of the three-core mixed-transmission low-temperature energy pipeline provided by this invention has a thickness of approximately 10mm, the inner sheath layer 3 has a thickness of approximately 5mm, the first wear-resistant layer 5 has a thickness of 0.5-1mm, the second wear-resistant layer 7 has a thickness of 0.5-1mm, the thermal insulation layer 8 has a thickness of 60-100mm, and the outer sheath layer 9 has a thickness of 10-20mm. The first wear-resistant layer 5 and the second wear-resistant layer 7 are generally made of the same fiber cloth or polymer material, the thermal insulation layer 2 and the thermal insulation layer 8 are generally made of aerogel material, and the inner sheath layer 3 and the outer sheath layer 9 are generally made of high-density polyethylene material.

[0074] The present invention provides a three-core hybrid marine cryogenic energy pipeline, which is a marine cryogenic energy pipeline structure that can simultaneously transport liquefied natural gas (LNG), liquid carbon dioxide (L-CO2) and liquid hydrogen (LH2) in deep-sea areas, which can greatly improve its transportation efficiency and reduce operation and maintenance costs.

[0075] The present invention provides a three-core hybrid transmission marine cryogenic energy pipeline structure. The cryogenic medium transmission channel inside the pipeline is a three-core corrugated pipe layer 1. Compared with the single-core corrugated pipe layer structure, the three-core corrugated pipe layer 1 has more stable and safer structural mechanical characteristics, is less prone to structural failure such as buckling and instability, and is more suitable for deep-sea areas with complex and harsh marine environments.

[0076] The present invention provides a three-core hybrid transmission marine cryogenic energy pipeline structure that can fully recover liquid carbon dioxide (L-CO2) and liquid hydrogen (LH2) generated during offshore oil and gas extraction and transport them back to shore together with liquefied natural gas (LNG). This saves resources and protects the marine environment, and provides a useful reference for the conceptual design of marine flexible pipelines.

[0077] In practical engineering applications, when transporting liquefied natural gas (LNG), liquid carbon dioxide (L-CO2), and liquid hydrogen (LH2) in deep-sea areas using the three-core mixed-transmission marine cryogenic energy pipeline provided by this invention, the three cryogenic liquid media are transported inside the three-core corrugated pipe layer 1, and the cryogenic environment of the core structure can be maintained below -260℃; the insulation layer 8 is used for thermal insulation to maintain the cryogenic environment inside the pipeline and the normal temperature environment outside the pipeline, preventing the cryogenic media inside the pipeline from vaporizing and affecting the transportation efficiency, and preventing water vapor from freezing on the outer wall of the pipeline and affecting the safety performance of the pipeline.

[0078] In practical applications in deep-sea areas, when transporting liquefied natural gas (LNG), liquid carbon dioxide (L-CO2), and liquid hydrogen (LH2) through the three-core hybrid marine cryogenic energy pipeline provided by this invention, the pipeline connects an offshore floating platform (for extracting, processing, and storing the three cryogenic media) and a transport ship (for transporting the three cryogenic media), operating in place while floating on the sea surface. The marine cryogenic energy pipeline structure withstands the complex dynamic loads of the harsh sea conditions in deep-sea areas. While resisting the corresponding external tensile loads and providing axial tensile stiffness through inner and outer tensile armor layers, its spiral winding structure ensures that the overall pipeline structure has good bending flexibility to adapt to the complex dynamic wave action on the sea surface.

[0079] The present invention provides a three-core hybrid transmission cryogenic energy pipeline structure design, which can simultaneously transport three different cryogenic liquid media when extracting oil and natural gas in deep-sea areas, achieving high-efficiency and low-cost energy transportation.

[0080] like Figure 12 As shown, the present invention also provides a method for collecting multiple cryogenic media in deep-sea areas, using the aforementioned three-core hybrid transmission marine cryogenic energy pipeline, comprising:

[0081] S1: Connect the three interfaces of the three-core corrugated pipe layer of the energy pipeline to the interface of the energy processing device. The energy processing device is used to process the mixed energy collected from the ocean and output three energy media, namely liquefied natural gas, liquid carbon dioxide and liquid hydrogen, through the interface. The interface of the energy processing device includes three output ports, which are respectively connected to the three interfaces of the three-core corrugated pipe layer of the energy pipeline.

[0082] S2: Simultaneously inject liquefied natural gas, liquid carbon dioxide, and liquid hydrogen into the three-core corrugated pipe layer of the energy pipeline, and transport the three media in the deep-sea area through the energy pipeline;

[0083] S3: During the transportation process, the phase parameters of the three media in the three-core corrugated pipe layer of the energy pipeline are monitored in real time, and the output flow rate of the corresponding medium at the output port of the energy processing device is dynamically adjusted according to the monitored phase parameters of the three media.

[0084] The phase parameters include: the temperature parameter of the medium, the pressure parameter of the medium, and the flow rate of the medium.

[0085] In one embodiment, in step S3, environmental parameters of each section of the energy pipeline are also monitored in real time. The environmental parameters include: pipe wall temperature data of the three-core corrugated pipe layer, seawater temperature data, and energy pipeline vibration data.

[0086] In one embodiment, in step S3, dynamically adjusting the output flow rate of the corresponding medium at the output port of the energy processing device based on the monitored phase parameters and environmental parameters of the three media includes:

[0087] S31: Determine the key risk indicators of each medium based on the temperature data of each medium in the three-core corrugated pipe layer;

[0088] S32: Predict the status trend of each medium based on key risk indicators;

[0089] S33: Based on the state trend prediction results, the deviation of key risk indicators is used as the input of the PID controller to generate the latest flow adjustment for each medium;

[0090] S34: Dynamically adjust the output flow rate of the corresponding medium based on the latest flow rate adjustment amount of each medium.

[0091] This invention integrates the transportation of liquefied natural gas, liquid carbon dioxide, and liquid hydrogen using a three-core cryogenic energy pipeline. It combines real-time monitoring of environmental and phase parameters, uses saturation pressure difference as a key risk indicator for state trend prediction, and employs a closed-loop control method that uses a PID controller to generate flow adjustment and perform multi-media collaborative optimization. This effectively solves the problems of existing technologies being unable to safely and efficiently transport multiple cryogenic media in a single pipeline and maintaining the phase stability of the media in harsh deep-sea conditions. As a result, it significantly improves transportation efficiency and reduces operation and maintenance costs.

[0092] Further, step S31: determining the key risk indicators for each medium based on the temperature data of each medium in the three-core corrugated pipe layer includes:

[0093] The current saturated vapor pressure of each medium is determined based on the temperature data of each medium in the three-core corrugated pipe layer. The saturated pressure difference of each medium is determined based on the pressure data of each medium in the three-core corrugated pipe layer and the current saturated vapor pressure of each medium, which is the key risk indicator.

[0094] In one embodiment, determining the current saturated vapor pressure of each medium based on its temperature data within the three-core bellows layer specifically involves:

[0095] The medium at the current temperature is calculated using the following formula. saturated vapor pressure:

[0096] ;

[0097] in, Representative media include liquefied natural gas (LNG), liquid carbon dioxide (L-CO2), and liquid hydrogen (LH2). , and Let be the material constants of each medium. as medium Current temperature.

[0098] In one embodiment, the saturation pressure difference of each medium is determined based on the pressure data of each medium in the three-core bellows layer and the current saturated vapor pressure of each medium as follows:

[0099] The medium is calculated in real time according to the following formula. Saturation pressure difference:

[0100] ;

[0101] in, as medium The pressure.

[0102] In one embodiment, the reference values ​​of the material constants of each medium are shown in Table 1.

[0103] Table 1. Material constants of each medium

[0104]

[0105] In step S31 of this invention, the raw data collected in step S3 is used to convert the real-time temperature and pressure data of the medium into the most critical vaporization risk indicator, namely the real-time saturation pressure difference of each medium (LNG, L-CO2, LH2). The calculated saturation pressure difference is the core criterion for triggering subsequent steps and control actions.

[0106] This invention calculates the current saturated vapor pressure of each medium based on its temperature data and further combines it with real-time pressure data to determine the saturated pressure difference, a key risk indicator. This transforms complex phase monitoring into an intuitive and quantifiable physical quantity, which can scientifically and in real-time reflect the degree of proximity of the medium's current state to its vaporization point. This provides an accurate and reliable basis for subsequent risk assessment and control decisions, thereby avoiding misjudgments that may occur when relying on a single temperature or pressure parameter.

[0107] Furthermore, step S32: predicting the state trend of each medium based on key risk indicators includes:

[0108] The vaporization risk of each medium is determined based on the saturation pressure difference and the preset risk threshold. If the vaporization risk of each medium is low, the current flow rate is maintained. If the vaporization risk of any medium is high, the state trend of that medium is predicted.

[0109] In one embodiment, the vaporization risk of each medium is determined based on the saturation pressure difference and a preset risk threshold as follows:

[0110] like If so, the vaporization risk is determined to be low.

[0111] like If so, the risk of vaporization is determined to be high.

[0112] in, The preset risk threshold is, for example, 50 kPa. It is understood that the preset risk threshold can be set selectively according to different media, and the present invention does not specifically limit it.

[0113] This invention judges the saturation pressure difference by setting a preset risk threshold, distinguishes between low-risk and high-risk states, and only initiates state trend prediction for high-risk media. This hierarchical processing mechanism realizes the optimal allocation of system resources, avoids the burden of continuous prediction calculation for all media, thereby improving the system's response efficiency while ensuring safety, and ensuring that control actions are targeted.

[0114] Furthermore, the prediction of the state trend of this medium includes:

[0115] The heat flow rate per unit length of the three-core corrugated pipe layer is determined based on the temperature data of the medium in the three-core corrugated pipe layer and the seawater temperature data. The temperature rise rate is determined based on the heat flow rate per unit length and the flow velocity data of the medium. The temperature data of the medium in the future is predicted based on the temperature rise rate. The frictional pressure drop is determined based on the flow velocity data of the medium. Vibration compensation is introduced based on the vibration data of the energy pipeline to determine the predicted total pressure loss. The saturation pressure difference of the medium in the future is determined based on the temperature data of the medium in the future and the predicted total pressure loss.

[0116] The vaporization risk of the medium is determined based on the saturation pressure difference of the medium after a certain period of time and the preset risk threshold. If the vaporization risk of the medium is low, the current flow rate is maintained. If the vaporization risk of the medium is high, the subsequent process, i.e., step S33, is executed.

[0117] In one embodiment, the heat flow rate per unit length of the three-core corrugated pipe layer is determined based on the temperature data of the medium in the three-core corrugated pipe layer and the seawater temperature data as follows:

[0118] Calculate the medium according to the formula. Corresponding heat flow per unit length of three-core corrugated pipe layer:

[0119] ;

[0120] in, The overall heat transfer coefficient is related to the performance of the pipe insulation layer. as medium Corresponding to the flow channel diameter of the three-core corrugated tube layer, The seawater temperature at the location where the energy pipeline is laid. as medium Current temperature.

[0121] In one embodiment, the temperature rise rate is determined based on the heat flow rate per unit length and the flow velocity data of the medium as follows:

[0122] Calculate the temperature rise rate using the formula:

[0123] = ;

[0124] in, as medium mass flow rate as medium The specific heat capacity at constant pressure. Future temperature can be predicted by integration.

[0125] In one embodiment, determining the frictional pressure drop based on the flow velocity data of the medium specifically involves:

[0126] Calculate the medium according to the formula. Frictional pressure drop:

[0127] ;

[0128] in, as medium The coefficient of friction with the inner surface of the three-core corrugated tube layer. The length of the pipeline section. as medium density, as medium The flow rate, as medium The corresponding flow channel diameter of the three-core corrugated tube layer.

[0129] Pipeline vibration can exacerbate pressure drop fluctuations. In one embodiment, vibration compensation is introduced based on energy pipeline vibration data to determine the predicted total pressure loss, specifically:

[0130] Pressure drop correction using vibration data:

[0131] ;

[0132] in, For the prediction of the future The medium caused by vibration at all times Additional pressure drop, The empirical coefficient for the vibration-pressure effect is calibrated using historical data. as medium density, Each at a historical moment The measured vibration amplitude and vibration frequency, The integral time window length represents the time window length based on backtracking from the current time t. Predictions are made using historical vibration data over a given period of time. The weighting function or time-delay effect function represents the historical time. Vibration on the future The weight of the impact of time-dependent pressure can be determined based on a physical model or a data-driven approach.

[0133] The predicted total pressure loss is:

[0134] .

[0135] In one embodiment, the saturation pressure difference of the medium after a future period of time is determined based on the temperature data of the medium after a future period of time and the predicted total pressure loss, specifically as follows:

[0136] According to the medium The current pressure and predicted total pressure loss determine the medium after a certain period of time. The pressure, based on the medium after a certain period of time in the future. The pressure and temperature data of the medium in the future determine the medium in the future. The saturation pressure difference.

[0137] Specifically, the medium some time from now Pressure as medium The difference between the current pressure and the predicted total pressure loss.

[0138] Specifically, the medium some time from now The temperature data is determined based on the temperature rise rate formula.

[0139] Specifically, in the medium after obtaining a certain period of time in the future Pressure and medium after a period of time After the temperature is determined, the calculation medium is as described above. The method and formula for determining the saturation pressure difference of a medium at a predicted temperature some time in the future. The saturation pressure difference will not be elaborated here.

[0140] In one embodiment, determining the vaporization risk of a medium based on the saturation pressure difference of the medium after a certain period of time and a preset risk threshold is the same as the aforementioned process of determining the vaporization risk of each medium based on the saturation pressure difference of each medium and a preset risk threshold, and will not be repeated here.

[0141] Step S32 of this invention performs a forward-looking analysis based on the saturation pressure difference index obtained in step S31 and the environmental data collected in step S3. By calculating the environmental heat inflow and pipeline pressure drop (and incorporating vibration data for compensation and correction), the short-term trends in the temperature and pressure of each medium are predicted. This prediction provides a forward-looking basis for subsequent adjustment decisions, realizing a shift from passive response to proactive prevention.

[0142] This invention predicts the saturation pressure difference of the medium in future periods by comprehensively calculating the heat flow per unit length, the rate of temperature rise, the frictional pressure drop, and introducing vibration compensation. It comprehensively considers the influence of multiple dynamic factors such as environmental heat intrusion, fluid dynamics, and pipeline mechanical vibration, making the prediction model closer to the actual complex working conditions. It can achieve a leap from passive response to active prevention, identify potential vaporization risks in advance, and leave valuable time for adjustment.

[0143] Furthermore, in step S33, using the deviation of key risk indicators as input to the PID controller to generate the latest flow adjustment for each medium includes:

[0144] The input to the PID controller is the saturation pressure difference deviation, and the output is the flow adjustment proportional coefficient. The latest flow adjustment amount is determined based on the flow adjustment proportional coefficient and the current flow rate.

[0145] In one embodiment, the medium The saturation pressure difference deviation is: ;

[0146] The PID output is:

[0147] ;

[0148] in, For PID parameters tuned to suit various media and pipeline conditions, parameter tuning can refer to the empirical method of P first, then I, and then D. For at a certain point in time medium Real-time saturation pressure difference deviation.

[0149] The latest traffic adjustment is as follows:

[0150] ;

[0151] The new mass flow rate setting is:

[0152] .

[0153] If the prediction in step S32 indicates a risk of insufficient saturation pressure differential, the output of step S32 (risk state trend) is sent as input to the PID controller. The controller calculates the initial flow adjustment required for a single medium to stabilize the saturation pressure differential using a specific algorithm. This step transforms the risk signal into a specific control command.

[0154] This invention employs the classic PID control algorithm, using the saturation pressure difference deviation as input to generate the flow adjustment amount. The PID controller features a simple structure, convenient adjustment, good stability, and does not rely on a precise mathematical model. It can perform comprehensive proportional, integral, and derivative adjustments based on the magnitude, duration, and trend of the saturation pressure difference deviation, thereby achieving smooth and precise flow control.

[0155] Further, step S34: dynamically adjusting the output flow rate of the corresponding medium based on the latest flow rate adjustment amount of each medium includes:

[0156] The transportation of liquefied natural gas, liquid carbon dioxide, and liquid hydrogen is optimized in a coordinated manner. The objective function is to minimize the total vaporization risk of the three media. The constraints include the maximum processing capacity of the FLNG platform and the safe flow rate range of the pipeline.

[0157] It is understandable that the FLNG platform refers to the aforementioned energy processing device.

[0158] In one embodiment, the objective function is:

[0159] ;

[0160] in, as medium Priority weights.

[0161] The constraints include: the adjusted flow rates of each medium. The flow rate must not exceed the upper limit of the FLNG platform's processing capacity and the lower limit of the pipeline's safe flow rate, as well as the adjusted pressure of each medium. It must always be above the safety margin.

[0162] This invention overcomes the potential conflicts that may arise from individually adjusting the flow rate of each medium by constructing a collaborative optimization model with the objective function of minimizing the total vaporization risk and constrained by platform processing capacity and pipeline safety flow rate. It performs overall optimization from a system-wide perspective, ensuring that the optimal combination of the flow rates of each medium is found under the overall safety constraints, thereby maximizing transportation efficiency while ensuring pipeline safety.

[0163] Furthermore, the method also includes:

[0164] After each flow adjustment, a new round of real-time monitoring of phase parameters is performed. The output flow of the corresponding medium is dynamically adjusted based on the monitored environmental and phase parameters until the saturation pressure difference of each medium stabilizes within a safe range.

[0165] Optimized traffic It is sent to the processing unit for flow control.

[0166] Closely observe during the adjusted monitoring periods. Changes, if A steady rise above the threshold indicates that the adjustment was effective. If no improvement is observed or the situation continues to worsen, the system will return to step 3, re-collect data, and start a new round of calculations until the saturation pressure difference of each medium stabilizes within a safe range.

[0167] This invention establishes a continuous closed-loop feedback control mechanism by immediately initiating a new round of real-time monitoring of phase parameters after each flow adjustment and dynamically adjusting the flow rate again based on the latest data. This enables the system to dynamically respond to continuously changing environmental conditions (seawater temperature fluctuations, pipeline vibrations) and media states during the transportation process. By continuously comparing and correcting the deviation between the set target and the actual state, the system ensures that the control effect does not become static after a single adjustment, but rather continuously approaches and ultimately stabilizes the saturation pressure difference of each medium within a safe range. This greatly enhances the adaptive capability, robustness, and long-term operational stability of the entire transportation system, effectively preventing risks that may be caused by control lag or operating condition drift.

[0168] Understandably, due to the long length of the energy pipeline, this invention divides the energy pipeline into several sections, that is, divides the energy pipeline into several equal segments. Environmental parameters and phase parameters are monitored for each segment of the energy pipeline. In one embodiment, the aforementioned seawater temperature data... Vibration data of energy pipelines, and temperature data of various media in the three-core corrugated pipe layer. Pressure data of various media in the three-core corrugated pipe layer Flow velocity data of each medium in the three-core corrugated pipe layer These are all average values ​​of several energy pipeline monitoring data.

[0169] This invention takes the independent adjustment commands for each medium generated in step S33 as input and performs global optimization in a higher-level system model. It is responsible for resolving potential conflicts between adjustment requirements of different media, and comprehensively considers constraints such as the FLNG platform's processing capacity and pipeline safety flow rate, ultimately outputting a set of system-level, coordinated optimal flow rate setpoints.

[0170] The present invention issues the final decision (flow rate setpoint) and immediately returns to step S3 to start a new round of data collection to monitor the actual change of the saturation pressure difference after adjustment. This completes the full cycle from perception to decision to execution. Based on the execution effect, it decides whether to maintain the status quo or start a new round of adjustment, thus forming a self-correcting closed-loop feedback system.

[0171] Understandably, pipe wall temperature directly reflects the insulation performance of the pipeline. Ideally, if the insulation layer is intact, the pipe wall temperature should be very close to the external seawater temperature. If the pipe wall temperature of a certain section of the pipeline is found to be significantly lower than the seawater temperature, it indicates that there may be a defect in the insulation layer at that location, such as damage, causing abnormal and excessive heat to enter the pipeline.

[0172] In one embodiment, the pipe wall temperature and seawater temperature are continuously compared. When the difference between the two exceeds a preset reasonable range, an alarm is triggered, prompting maintenance personnel to inspect and maintain the specific pipe section. This proactive early warning mechanism can detect potential problems before the medium temperature rises significantly due to leakage and the risk of vaporization increases sharply.

[0173] In another embodiment, in step S3, dynamically adjusting the output flow rate of the corresponding medium at the output port of the energy processing device based on the monitored phase parameters of the three media includes:

[0174] When the temperature of a certain medium is detected to be close to the vaporization threshold, the output flow rate of that medium at the output port of the energy processing device is reduced.

[0175] When the pressure or flow rate of a certain medium is detected to deviate from the preset range, the output flow rate of that medium at the output port of the energy processing device is adjusted so that the pressure or flow rate can be restored to stability.

[0176] As one implementation method, the vaporization thresholds for liquefied natural gas (LNG) are set at -162°C, for liquid carbon dioxide at -78°C, and for liquid hydrogen at -253°C. The average temperatures of the three media in the three-core corrugated pipe layer 1 of the energy pipeline are monitored in real time. When the average temperature of a certain medium approaches its vaporization threshold, or if the average temperature is within 5°C below the vaporization threshold, the output flow rate of that medium is reduced. Here, the average temperature is the average temperature of all sections of the energy pipeline.

[0177] In one implementation method, the flow velocity range of liquefied natural gas is set to 1-3 m / s, the flow velocity range of liquid carbon dioxide is set to 0.5-2 m / s, and the flow velocity range of liquid hydrogen is set to 0.5-1 m / s. The average flow velocity of the three media in the three-core corrugated pipe layer 1 of the energy pipeline is monitored in real time. When the average flow velocity of a certain medium deviates from the preset range, that is, when the average flow velocity exceeds / below the preset flow velocity range, the output flow rate of that medium is reduced / increased to bring the average flow velocity of the medium within the preset range. The average flow velocity is the average value of the flow velocities of all sections of the entire energy pipeline.

[0178] In one implementation method, the transport pressure range for liquefied natural gas is set to 8-15 bar(g), for liquid carbon dioxide to 100-120 bar(a), and for liquid hydrogen to 5-20 bar(g). The transport pressures of these three media in the three-core corrugated pipe layer 1 of the energy pipeline are monitored in real time. When the transport pressure of a certain medium deviates from the preset pressure range (i.e., the transport pressure exceeds / falls below the preset pressure range), the output flow rate of that medium is reduced / increased to bring the transport pressure within the preset range. Here, the transport pressure is the average pressure of all sections of the energy pipeline.

[0179] This invention combines a three-core mixed-transmission pipeline structure with a data acquisition method. By utilizing the independent channel design of the three-core corrugated pipe layer 1, it achieves parallel transportation of three cryogenic media. By monitoring phase parameters such as temperature, pressure, and flow rate in real time and dynamically adjusting the flow rate, it ensures the phase stability and flow balance of the multiple media in complex marine environments. This avoids vaporization of the multiple media during transportation, which would reduce transportation efficiency. It significantly improves the efficiency of multi-media transportation in deep-sea areas, greatly reduces operation and maintenance costs, and achieves energy conservation.

[0180] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0181] It will be readily understood by those skilled in the art that this invention includes any combination of the inventive description and specific embodiments outlined in the foregoing specification, as well as the various parts shown in the accompanying drawings. Due to space limitations and for the sake of brevity, not all of these combinations have been described in detail. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

[0182] Although embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for collecting multiple low-temperature media in the deep and far sea areas, using a marine low-temperature-resistant energy pipeline with three-core mixed transportation. The energy pipeline includes: An insulation protection layer, which is coated on each corrugated pipe layer; An inner sheath layer, which wraps the corrugated pipe layer and the insulation protection layer to form an integral core structure; A first tensile armor layer, which is helically wound around the outer wall of the inner sheath layer; A first abrasion-resistant layer, which is coated on the outer wall of the first tensile armor layer; A second tensile armor layer, which is helically wound around the outer wall of the first abrasion-resistant layer; A second abrasion-resistant layer, which is coated on the outer wall of the second tensile armor layer; A thermal insulation layer, which is arranged on the outer circumferential surface of the second abrasion-resistant layer; An outer sheath layer, which is coated outside the thermal insulation layer; It is characterized in that The corrugated pipe layer is a three-core corrugated pipe layer, which is used to transport the same or multiple different low-temperature media and provide radial support for the entire energy pipeline; The three-core corrugated pipe layer includes three identical metal corrugated pipes, and the three metal corrugated pipes are arranged in a "pin" shape; Dock the three interfaces of the three-core corrugated pipe layer of the energy pipeline with the interfaces of the energy processing device. The energy processing device is used to process the mixed energy collected from the ocean and output three energy media, namely liquefied natural gas, liquid carbon dioxide and liquid hydrogen, through the interfaces. The interfaces of the energy processing device include three output ports, which are respectively connected to the three interfaces of the three-core corrugated pipe layer of the energy pipeline; Inject liquefied natural gas, liquid carbon dioxide and liquid hydrogen into the three-core corrugated pipe layer of the energy pipeline at the same time, and transport the liquefied natural gas, liquid carbon dioxide and liquid hydrogen in the deep and far sea areas through the energy pipeline; During the transportation process, the phase state parameters of the three media in the three-core corrugated pipe layer of the energy pipeline are monitored in real time, and the output flow of the corresponding media at the output port of the energy processing device is dynamically adjusted according to the monitored phase state parameters of the three media; The phase state parameters include: the temperature of the medium, the pressure of the medium and the flow velocity of the medium; The dynamically adjusting the output flow of the corresponding media at the output port of the energy processing device according to the monitored phase state parameters of the three media includes: Determining the key risk indicators of each medium according to the temperature data of each medium in the three-core corrugated pipe layer; Predicting the state trend of each medium according to the key risk indicators; Taking the deviation of the key risk indicator as the input of the PID controller according to the state trend prediction result, and generating the latest flow adjustment amount of each medium; Dynamically adjusting the output flow of the corresponding medium according to the latest flow adjustment amount of each medium.

2. The method for collecting various cryogenic media in deep-sea areas as described in claim 1, characterized in that, It also includes: A monitoring optical fiber, which is arranged at the central gap of the three-core corrugated pipe layer and is closely adhered to the insulation protection layer; A filling support layer, which is arranged at the outer gap of the three-core corrugated pipe layer and is closely adhered to the insulation protection layer and the inner sheath layer.

3. The method for collecting various cryogenic media in deep-sea areas as described in claim 1, characterized in that, Each of the corrugated pipes has an inner diameter of 30-40 mm and a wall thickness of 0.6 mm; the heat insulation layer has a thickness of 10 mm and is made of aerogel material; the inner sheath layer has a thickness of 5 mm and is made of high-density polyethylene material.

4. The method for collecting various cryogenic media in deep-sea areas as described in claim 2, characterized in that, The filling support layer has an irregular shape, which is consistent with the external gap between the three-core corrugated pipe layer and the inner sheath layer, and is made of non-metallic material with heat insulation properties.

5. The method for collecting various cryogenic media in deep-sea areas as described in claim 1, characterized in that, Both the first and second tensile armor layers are made of flat fiber strips that are spirally woven from carbon fiber in a twisted pattern, with longitudinal and transverse interlacing, wound at a spiral angle of 20-30°. The first and second tensile armor layers are wound in opposite directions. The width of the flat fiber strips is 40-50 mm, the layer thickness is 1-2 mm, and the number of flat fiber strips in the first and second tensile armor layers is 8-16, forming a twisted structure through interlacing.

6. The method for collecting various cryogenic media in deep-sea areas as described in claim 1, characterized in that, The first and second anti-wear layers are both 0.5-1 mm thick and are made of fiber cloth or polymer material; the insulation layer is 60-100 mm thick and is made of aerogel material; the outer sheath layer is 10-20 mm thick and is made of high-density polyethylene material.

7. The method for collecting multiple cryogenic media in deep-sea areas as described in claim 2, characterized in that, The metal corrugated pipe is made of 316L, 304 or 316 stainless steel. The corrugation height is 12-16mm and the corrugation pitch is 8-12mm. The center of the cross-section of the three-core corrugated pipe layer coincides with the center of the cross-section of the inner sheath layer. The inner sheath layer, the first tensile armor layer, the first wear-resistant layer, the second tensile armor layer, the second wear-resistant layer, the heat insulation layer and the outer sheath layer are tightly fitted and their cross-sectional centers are coaxial.

8. The method for collecting multiple cryogenic media in deep-sea areas as described in claim 1, characterized in that, The prediction of the state trend of each medium based on key risk indicators includes: The vaporization risk of each medium is determined based on its saturation pressure difference and a preset risk threshold. If the vaporization risk of any medium is low, the current flow rate is maintained. If the vaporization risk of any medium is high, a state trend prediction is performed for that medium. The state trend prediction for that medium includes: The heat flow rate per unit length of the three-core corrugated pipe layer is determined based on the temperature data of the medium in the three-core corrugated pipe layer and the seawater temperature data. The temperature rise rate is determined based on the heat flow rate per unit length and the flow velocity data of the medium. The temperature data of the medium in the future is predicted based on the temperature rise rate. The frictional pressure drop is determined based on the flow velocity data of the medium. Vibration compensation is introduced based on the vibration data of the energy pipeline to determine the predicted total pressure loss. The saturation pressure difference of the medium in the future is determined based on the temperature data of the medium in the future and the predicted total pressure loss. The vaporization risk of the medium is determined based on the saturation pressure difference of the medium after a certain period of time and the preset risk threshold. If the vaporization risk of the medium is low, the current flow rate is maintained. If the vaporization risk of the medium is high, the subsequent process is executed.

Images