A method, system, device, and medium for increasing throughput of a natural gas pipeline

Abstract

The application discloses a natural gas pipeline throughput increasing method, system, device and medium, and relates to the technical field of increasing pipeline throughput, which comprises the following steps: when a natural gas pipeline station receives a throughput increasing request, LNG is injected into an injection port of the natural gas pipeline, and the temperature of the injection port is collected in real time; the temperature of the injection port is kept within a preset temperature range, and the LNG injection amount corresponding to the throughput increasing request is completed, and the throughput of the natural gas pipeline is increased. The application realizes comprehensive utilization of cold energy by using LNG for cooling and conveying, so that the purpose of increasing pipeline throughput is achieved.

Description

Technical Field

[0001] This invention relates to the field of increasing pipeline transport capacity, and in particular to a method, system, equipment, and medium for increasing the transport capacity of natural gas pipelines. Background Technology

[0002] During natural gas pipeline transportation, due to high flow velocity, high pressure, and large pipe diameter, the main natural gas pipelines of the State Pipeline Group almost all operate within the square region of fully turbulent resistance. In actual production, the State Pipeline Group faces an urgent need for drag reduction and increased transmission capacity. For example, the increased transmission demand of the Anping-Yongqing section of the Shaanxi-Beijing Second Pipeline exceeds 14.9%, and the increased transmission demand of the Yongtangqin Pipeline exceeds 28.4%. Especially during peak gas consumption periods in different seasons, the natural gas pipelines of the State Pipeline Group face significant production pressure and urgently need the support of drag reduction and increased transmission technology. Summary of the Invention

[0003] The technical problem to be solved by this invention is to address the shortcomings of existing technologies, and specifically provides a method, system, equipment, and medium for increasing the transmission capacity of natural gas pipelines, as detailed below:

[0004] 1) In a first aspect, the present invention provides a method for increasing the transmission capacity of natural gas pipelines, the specific technical solution of which is as follows:

[0005] When a natural gas pipeline station receives a request for increased transmission, it injects LNG into the injection port of the natural gas pipeline and collects the temperature of the injection port in real time.

[0006] Maintain the temperature of the injection port within the preset temperature range, and complete the LNG injection volume corresponding to the increased transmission request to complete the increased transmission of natural gas pipeline.

[0007] The beneficial effects of the natural gas pipeline enhancement method provided by this invention are as follows:

[0008] By using LNG, the long-standing technical challenge of reducing drag and increasing transmission capacity in natural gas pipelines, which has remained unresolved both domestically and internationally, can be solved. Whether in the eastern coastal areas of my country where LNG supply is convenient or in the central and western regions where LNG is inconvenient to obtain, natural gas pipelines can achieve LNG injection and cooling transportation at pipeline stations, thereby realizing the comprehensive utilization of cold energy, promoting the effective use of clean energy throughout society, and bringing huge economic benefits, energy conservation, emission reduction, and environmental protection effects.

[0009] Based on the above solution, the present invention can be further improved as follows.

[0010] Furthermore, the method for determining the LNG is as follows:

[0011] By combining the hydraulic formula of natural gas pipeline, all the parameters affecting the transportation volume of natural gas pipeline are determined, all the parameters are verified, and the temperature parameter is determined to be the optimal parameter. Based on the temperature parameter, the medium corresponding to the optimal parameter is determined to be LNG.

[0012] Among them, all influencing parameters include: friction coefficient, temperature, and compressibility factor.

[0013] Furthermore, the LNG acquisition methods include: extracting LNG from an on-board LNG storage tank or preparing LNG through natural gas liquefaction.

[0014] 2) In a second aspect, the present invention also provides a natural gas pipeline enhancement system, the specific technical solution of which is as follows:

[0015] The injection module is used to: inject LNG into the injection port of the natural gas pipeline and collect the temperature of the injection port in real time when the natural gas pipeline station receives a request for increased transmission;

[0016] The booster module is used to: maintain the temperature of the injection port within a preset temperature range, and complete the LNG injection volume corresponding to the booster request, thereby completing the booster of the natural gas pipeline.

[0017] Based on the above solution, the present invention can be further improved as follows.

[0018] Furthermore, the method for determining the LNG is as follows:

[0019] By combining the hydraulic formula of natural gas pipeline, all the parameters affecting the transportation volume of natural gas pipeline are determined, all the parameters are verified, and the temperature parameter is determined to be the optimal parameter. Based on the temperature parameter, the medium corresponding to the optimal parameter is determined to be LNG.

[0020] Among them, all influencing parameters include: friction coefficient, temperature, and compressibility factor.

[0021] Furthermore, the LNG acquisition methods include: extracting LNG from an on-board LNG storage tank or preparing LNG through natural gas liquefaction.

[0022] 3) In a third aspect, the present invention also provides a computer device, the computer device including a processor coupled to a memory, the memory storing at least one computer program, the at least one computer program being loaded and executed by the processor to enable the computer device to implement any of the above methods.

[0023] 4) In a fourth aspect, the present invention also provides a computer-readable storage medium storing at least one computer program, which is loaded and executed by a processor to enable a computer to perform any of the above methods.

[0024] It should be noted that the beneficial effects of the technical solutions of the second to fourth aspects of the present invention and their corresponding possible implementations can be found in the above description of the technical effects of the first aspect and its corresponding possible implementations, and will not be repeated here. Attached Figure Description

[0025] Other features, objects, and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0026] Figure 1 This is a schematic flowchart of a natural gas pipeline enhancement method according to an embodiment of the present invention;

[0027] Figure 2 This is a methane density-temperature curve of a natural gas pipeline, representing an embodiment of the present invention, for a method to increase the transportation capacity of a natural gas pipeline.

[0028] Figure 3 The image shows the methane viscosity-temperature curve of a natural gas pipeline in an embodiment of the present invention for a method to increase the transportation capacity of a natural gas pipeline.

[0029] Figure 4 This is a schematic diagram illustrating the simulation calculation of the increase in outlet temperature and transmission capacity of the West-to-North Water Transfer Line II and III, which is an embodiment of the present invention for a natural gas pipeline transmission enhancement method.

[0030] Figure 5 The methane phase diagram is shown in an embodiment of the present invention for a method to increase the transportation capacity of a natural gas pipeline.

[0031] Figure 6 This is a structural framework diagram of a computer device. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0033] like Figure 1 As shown, an embodiment of the present invention provides a method for increasing the transmission capacity of a natural gas pipeline, comprising the following steps:

[0034] S1, when the natural gas pipeline station receives a request for increased transmission, LNG is injected into the injection port of the natural gas pipeline, and the temperature of the injection port is collected in real time. Wherein:

[0035] Natural gas pipeline stations refer to management platforms or bases that coordinate the gas transmission, intake, and distribution of all pipelines in a given area.

[0036] An increase request is a request to increase the transport volume when, after checking all pipeline segments and finding no abnormalities, it is determined that the supply of the scheduled quantity cannot be completed within the time corresponding to the scheduling requirement.

[0037] The injection port of a natural gas pipeline can be the gas inlet of the natural gas pipeline.

[0038] LNG refers to cryogenic medium.

[0039] The temperature at the injection port is collected by a temperature sensor located at the injection port.

[0040] S2, maintain the temperature of the injection port within the preset temperature range, and complete the LNG injection volume corresponding to the increased transmission request to complete the increased transmission of natural gas pipeline.

[0041] When the temperature of the injection port is not within the preset temperature range, immediately stop injecting LNG into the injection port and wait for the temperature of the injection port to return to the preset temperature range before restarting the injection of LNG into the injection port.

[0042] The beneficial effects of the natural gas pipeline enhancement method provided by this invention are as follows:

[0043] By using LNG, the long-standing technical challenge of reducing drag and increasing transmission capacity in natural gas pipelines, which has remained unresolved both domestically and internationally, can be solved. Whether in the eastern coastal areas of my country where LNG supply is convenient or in the central and western regions where LNG is inconvenient to obtain, natural gas pipelines can achieve LNG injection and cooling transportation at pipeline stations, thereby realizing the comprehensive utilization of cold energy, promoting the effective use of clean energy throughout society, and bringing huge economic benefits, energy conservation, emission reduction, and environmental protection effects.

[0044] Furthermore, the method for determining the LNG is as follows:

[0045] By combining the hydraulic formula of natural gas pipeline, all the parameters affecting the transportation volume of natural gas pipeline are determined, all the parameters are verified, and the temperature parameter is determined to be the optimal parameter. Based on the temperature parameter, the medium corresponding to the optimal parameter is determined to be LNG.

[0046] Among them, all influencing parameters include: friction coefficient, temperature, and compressibility factor.

[0047] To determine which medium can increase the pipeline's transport capacity, the following research method is proposed:

[0048] First, determine the hydraulic formula for natural gas pipelines (GB 50251), as follows:

[0049]

[0050] Where, qv The flow rate (m³) of the gas (P0 = 0.101325 MPa, T = 293 K) 3 / d), P1 is the starting pressure (absolute) (MPa) of the calculated section of the gas pipeline, P2 is the ending pressure (absolute) (MPa) of the calculated section of the gas pipeline, d is the inner diameter of the gas pipeline (cm), λ is the hydraulic friction coefficient, Z is the compressibility factor of the gas, Δ is the relative density of the gas, T is the average temperature of the gas in the gas pipeline (K), and L is the length of the calculated section of the gas pipeline (km).

[0051] As can be seen from the above formulas, parameters such as pipe diameter, length, pressure, and the properties of the medium itself are immutable, while the friction coefficient, temperature, and compressibility factor are variable. This means that for a specific pipeline, only these three variables can significantly affect the throughput. Furthermore, it is certain that reducing the friction coefficient can increase throughput by reducing drag, as has been proven in practice. However, temperature changes are more complex. Temperature variations can cause changes in parameters such as gas density, compressibility factor, friction, and dynamic viscosity, making it difficult to determine the specific impact on throughput.

[0052] Furthermore, when the substance in the pipeline is methane, the temperature-density curve of methane (e.g.) is obtained. Figure 2 (as shown) and the temperature-dynamic viscosity curve of methane (as shown) Figure 3 As shown in the diagram, within the pipeline transportation temperature range used in engineering, such as above -10℃, at the same pressure, the density of methane increases significantly with decreasing temperature, and the increase in density is greater with increasing pressure. This indicates that transporting a unit volume of natural gas results in an increase in mass, which is equivalent to an increase in volume compared to before cooling. Within the pipeline transportation temperature range used in engineering, such as above -10℃, at pressures less than or equal to 10 MPa, the dynamic viscosity of methane decreases with decreasing temperature. This indicates that the internal friction of the fluid does not increase with increasing density; on the contrary, it decreases, which will also lead to a reduction in energy consumption.

[0053] Therefore, preliminary analysis suggests that the decrease in temperature leads to an increase in gas density and a decrease in dynamic viscosity, which should result in an increase in throughput while keeping the pipe volume constant.

[0054] To verify the above statement, namely that temperature is a factor affecting the delivery volume, the following experiment was conducted:

[0055] The pipeline design institute simulated data on the potential impact of changes in outlet temperature on pipeline throughput in a real pipeline. Under unchanged basic operating conditions, the pipeline throughput changed as follows by activating the air cooler to lower the delivery temperature: Figure 4As shown, the transmission volume increases significantly with decreasing outlet temperature. At an outlet temperature of 25℃, daily transmission volume can be increased by 14.6% and annual transmission volume by 23.9%, respectively. Considering that the minimum transmission temperature of domestic natural gas pipelines is generally around 0℃, this results in a large temperature drop range at the outlet end of most natural gas pipelines (assuming no ice blockage issues, which can be resolved using hydrate inhibitors).

[0056] In addition, the principle of the increased transmission effect brought about by lowering the temperature of natural gas can also be analyzed from the perspective of thermodynamic energy conservation. Since the internal energy of gas molecules (that is, the sum of kinetic energy and potential energy) is affected by temperature, the lower the temperature, the smaller the internal energy, and the lower the energy of molecular motion, thus inhibiting turbulence to a certain extent. Under the same compressor work, macroscopically, this will inevitably lead to an increase in transmission capacity.

[0057] LNG has the same composition as natural gas, but its temperature is -162℃, providing ample heat exchange and cooling capacity. Furthermore, one cubic meter of LNG can be vaporized into approximately 600 cubic meters of gaseous natural gas. Because natural gas itself has a very low dynamic viscosity (e.g., around 0.01 cP at 50℃ and 12 MPa), its Reynolds number in pipelines can reach approximately 107-108 (pipe diameter 1219 mm, pressure 12 MPa) or even higher, placing it in a fully turbulent flow state. Therefore, LNG injected into the pipeline can quickly vaporize and mix with natural gas, thereby lowering the gas flow temperature. Thus, injecting a certain proportion of LNG into natural gas pipelines can be considered to cool pipeline-transported natural gas while simultaneously significantly increasing natural gas throughput.

[0058] According to the methane phase diagram, methane is essentially in the gas phase at a pressure of 12 MPa and a temperature above -13°C. For example... Figure 5 As shown. Therefore, when a small amount of LNG is injected or sprayed into the outlet of a natural gas station at a pressure typically below 12 MPa and a temperature between 40-70°C, the LNG will vaporize instantly upon entering the pipeline and be carried away by the strong natural gas flow. Therefore, there is no issue of cryogenic LNG adhering to the pipe wall surface and affecting the toughness of the pipe material or inner coating.

[0059] From a broad perspective, natural gas transmission enhancement can be approached from two aspects: fluid and pipeline. This approach, which focuses on reducing drag and enhancing transmission from the fluid perspective, may seem simple, but it involves introducing new matter, energy, and momentum into a relatively closed fluid equilibrium system to achieve a new balance. It falls under the category of turbulent fluid drag reduction and integrates the basic principles of fluid mechanics and thermodynamics with the mechanism of drag reduction and transmission enhancement. It can be described as an extremely ingenious method for enhancing natural gas transmission.

[0060] Furthermore, the LNG acquisition methods include: extracting LNG from an on-board LNG storage tank or preparing LNG through natural gas liquefaction.

[0061] Example 1, 1. LNG injection cooling and transportation enhancement method;

[0062] This invention is the first to propose a method for increasing pipeline transportation by injecting LNG into natural gas pipelines. The LNG can be sourced from onboard LNG storage tanks or from LNG produced locally at natural gas stations using natural gas liquefaction in pipelines.

[0063] 2. Peak-shaving operation method of natural gas pipelines

[0064] This invention is the first to propose a method for local liquefaction and storage of natural gas in pipelines, followed by direct injection of LNG when pipeline capacity needs to be increased, without the need for pre-gasification. Foreign methods involve locally gasifying LNG before injecting it into pipelines for peak shaving, but these methods fail to consider the increased transport capacity effect achieved by LNG injection into pipelines after temperature reduction.

[0065] This invention is the first in China to propose using distributed energy sources such as solar, wind, and thermal power generation at natural gas stations to produce LNG, achieving comprehensive energy utilization and energy conservation. Because pipeline natural gas has a relatively simple composition and few impurities, a separate purification process is no longer required, making LNG production relatively easy to implement.

[0066] LNG production can utilize currently mature natural gas liquefaction processes, primarily including: cascade liquefaction processes, mixed refrigerant liquefaction processes, and liquefaction processes with expanders. Different natural gas liquefaction processes can be adopted depending on specific requirements.

[0067] 3. LNG injection unit and injection process

[0068] This invention is the first to propose a method for directly injecting LNG into natural gas pipelines using fixed or skid-mounted devices at natural gas pipeline stations. The process primarily involves drawing LNG from an LNG tank using a cryogenic pressure pump, and then injecting it into the natural gas pipeline through a cryogenic pipeline and an inlet on the natural gas outlet pipeline. The inlet on the outlet pipeline must meet cryogenic material requirements, or heat tracing must be used to ensure the injection port is within an acceptable temperature range. Furthermore, to ensure that the LNG quickly vaporizes and mixes with the natural gas after injection, preventing it from spraying onto the pipeline inner wall and affecting its physical properties due to cryogenic temperatures, the LNG injection port must achieve atomized spraying.

[0069] 4. Gasification process of LNG receiving terminal

[0070] This invention can be used to establish an auxiliary gasification process at LNG receiving terminals, where some LNG is not gasified through seawater heat exchange, but is directly injected into the gasified natural gas export pipeline or a natural gas pipeline near the LNG receiving terminal, achieving energy saving, cooling, and increased transmission effects.

[0071] 5. Urban cooling energy utilization

[0072] This invention can be used to inject LNG into urban natural gas pipelines, reduce the temperature of the natural gas during transportation, and combine it with urban cold energy utilization through heat exchangers to achieve cooling for factory production or indoor cooling during hot summer weather.

[0073] Injecting LNG into natural gas pipelines will bring the following benefits:

[0074] If the LNG injection nozzle is placed at the center line of the compressor station's outlet pipeline, with an appropriate injection volume, the LNG will instantly vaporize and flow away with the natural gas flow, without the need for additional LNG vaporization equipment and costs.

[0075] The ultra-low temperature of LNG will easily reduce the temperature of the natural gas leaving the station. For example, a preliminary estimate suggests that an injection volume of about 0.835% (equivalent to 5% of the transmission volume after gasification) will result in a temperature drop of about 10-15°C at the station, and generate an additional transmission increase effect of more than 5%.

[0076] Simultaneous LNG injection at multiple pipeline stations will result in a more significant increase in overall pipeline transport capacity.

[0077] Under certain operating conditions, the air cooler can be shut down to achieve energy-saving and consumption-reducing operation.

[0078] Peak shaving in natural gas pipelines can be achieved by utilizing the liquefaction, storage, and injection cooling of natural gas.

[0079] In the above embodiments, although the steps are numbered S1, S2, etc., they are only specific embodiments given by the present invention. Those skilled in the art can adjust the execution order of S1, S2, etc. according to the actual situation, which is also within the protection scope of the present invention. It can be understood that in some embodiments, some or all of the above embodiments may be included.

[0080] This invention also provides a natural gas pipeline enhancement system, the specific technical solution of which is as follows:

[0081] The injection module is used to: inject LNG into the injection port of the natural gas pipeline and collect the temperature of the injection port in real time when the natural gas pipeline station receives a request for increased transmission;

[0082] The booster module is used to: maintain the temperature of the injection port within a preset temperature range, and complete the LNG injection volume corresponding to the booster request, thereby completing the booster of the natural gas pipeline.

[0083] Based on the above solution, the present invention can be further improved as follows.

[0084] Furthermore, the method for determining the LNG is as follows:

[0085] By combining the hydraulic formula of natural gas pipeline, all the parameters affecting the transportation volume of natural gas pipeline are determined, all the parameters are verified, and the temperature parameter is determined to be the optimal parameter. Based on the temperature parameter, the medium corresponding to the optimal parameter is determined to be LNG.

[0086] Among them, all influencing parameters include: friction coefficient, temperature, and compressibility factor.

[0087] Furthermore, the LNG acquisition methods include: extracting LNG from an on-board LNG storage tank or preparing LNG through natural gas liquefaction.

[0088] It should be noted that the beneficial effects of the natural gas pipeline enhancement system provided in the above embodiments are the same as those of the natural gas pipeline enhancement method described above, and will not be repeated here. Furthermore, the system provided in the above embodiments is only illustrated by the division of the above functional modules. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the system can be divided into different functional modules according to the actual situation to complete all or part of the functions described above. In addition, the system and method embodiments provided in the above embodiments belong to the same concept, and their specific implementation process is detailed in the method embodiments, and will not be repeated here.

[0089] like Figure 6 As shown, an embodiment of the present invention provides a computer device 300, which includes a processor 320 coupled to a memory 310. The memory 310 stores at least one computer program 330, which is loaded and executed by the processor 320 to enable the computer device 300 to implement any of the above-described methods. Specifically:

[0090] The computer device 300 can vary considerably due to differences in configuration or performance. It may include one or more processors 320 (Central Processing Units, CPUs) and one or more memories 310. The one or more memories 310 store at least one computer program 330, which is loaded and executed by the one or more processors 320 to enable the computer device 300 to implement the natural gas pipeline enhancement method provided in the above embodiments. Of course, the computer device 300 may also have wired or wireless network interfaces, a keyboard, and input / output interfaces for input and output. The computer device 300 may also include other components for implementing device functions, which will not be elaborated here.

[0091] An embodiment of the present invention provides a computer-readable storage medium storing at least one computer program, which is loaded and executed by a processor to enable a computer to implement any of the above-described methods.

[0092] Alternatively, the computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a compact disc read-only memory (CD-ROM), magnetic tape, a floppy disk, and an optical data storage device, etc.

[0093] In an exemplary embodiment, a computer program product or computer program is also provided, the computer program product or computer program including computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, causing the computer device to perform any of the methods described above.

[0094] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and represent a limitation on a specific order or sequence. Where appropriate, the order of use for similar objects can be interchanged so that the embodiments of this application described herein can be implemented in an order other than that shown or described.

[0095] Those skilled in the art will recognize that this invention can be implemented as a system, method, or computer program product. Therefore, this disclosure can be specifically implemented in the following forms: it can be entirely hardware, entirely software (including firmware, resident software, microcode, etc.), or a combination of hardware and software, generally referred to herein as a "circuit," "module," or "system." Furthermore, in some embodiments, this invention can also be implemented as a computer program product in one or more computer-readable media containing computer-readable program code.

[0096] Any combination of one or more computer-readable media may be used. A computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, apparatus, or device.

[0097] Although embodiments of the present invention have been shown and described above, it is 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.

Claims

1. A method for increasing the transmission capacity of a natural gas pipeline, characterized in that, include: When a natural gas pipeline station receives a request for increased transmission, it injects LNG into the injection port of the natural gas pipeline and collects the temperature of the injection port in real time. Maintain the temperature of the injection port within the preset temperature range, and complete the LNG injection volume corresponding to the increased transmission request to complete the increased transmission of natural gas pipeline; The method for determining the LNG is as follows: By combining the hydraulic formula of natural gas pipeline, all the parameters affecting the transportation volume of natural gas pipeline are determined, all the parameters are verified, and the temperature parameter is determined to be the optimal parameter. Based on the temperature parameter, the medium corresponding to the optimal parameter is determined to be LNG. Among them, all influencing parameters include: friction coefficient, temperature, and compressibility factor.

2. The method for increasing the transmission capacity of a natural gas pipeline according to claim 1, characterized in that, The methods for obtaining LNG include: extracting LNG from onboard LNG storage tanks or preparing LNG through natural gas liquefaction.

3. The method for increasing the transmission capacity of a natural gas pipeline according to claim 1, characterized in that, When the temperature at the injection port is not within the preset temperature range, LNG injection into the injection port shall be stopped.

4. A natural gas pipeline enhancement system, characterized in that, include: The injection module is used to: inject LNG into the injection port of the natural gas pipeline and collect the temperature of the injection port in real time when the natural gas pipeline station receives a request for increased transmission; The booster module is used to: maintain the temperature of the injection port within a preset temperature range, and complete the LNG injection volume corresponding to the booster request, thereby completing the booster of the natural gas pipeline; The method for determining the LNG is as follows: By combining the hydraulic formula of natural gas pipeline, all the parameters affecting the transportation volume of natural gas pipeline are determined, all the parameters are verified, and the temperature parameter is determined to be the optimal parameter. Based on the temperature parameter, the medium corresponding to the optimal parameter is determined to be LNG. Among them, all influencing parameters include: friction coefficient, temperature, and compressibility factor.

5. A natural gas pipeline enhancement system according to claim 4, characterized in that, The methods for obtaining LNG include: extracting LNG from onboard LNG storage tanks or preparing LNG through natural gas liquefaction.

6. A natural gas pipeline enhancement system according to claim 4, characterized in that, When the temperature at the injection port is outside the preset temperature range, LNG injection into the injection port is stopped.

7. A computer device, characterized in that, The computer device includes a processor coupled to a memory storing at least one computer program, which is loaded and executed by the processor to enable the computer device to perform the method as claimed in any one of claims 1 to 3.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores at least one computer program, which is loaded and executed by a processor to enable the computer to perform the method as claimed in any one of claims 1 to 3.

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