Hydrogen-doped natural gas conveying pipeline failure simulation system and related simulation method

Abstract

The invention discloses a failure simulation system for a hydrogen-doped natural gas conveying pipeline. The system comprises a gas injection recovery system, a mixed gas circulating pipeline and a monitoring system, the gas injection and recovery system is connected with the mixed gas circulating pipeline to form a mixed gas closed-loop transmission channel for simulating injection and recovery of hydrogen-doped natural gas; the monitoring system is used for monitoring the operation state of gas in the mixed gas circulating pipeline so as to obtain monitoring data. The gas circulation system for simulating the circulation process of the hydrogen-doped natural gas is constructed and can be used for collecting corresponding basic monitoring data, possibility is provided for establishing a state monitoring database of the hydrogen-doped natural gas conveying pipeline, and basic data support is provided for safe and efficient operation of the hydrogen-doped natural gas conveying pipeline.

Description

Technical Field

[0001] The present invention relates to the technical field of natural gas transportation safety, and in particular to a failure simulation system for a hydrogen-blended natural gas transportation pipeline and a related simulation method. Background Art

[0002] As a secondary energy source with abundant sources, green and low carbon, and wide application, hydrogen energy is gradually becoming one of the important carriers of global energy transformation and development, and an important part of the future energy system. Using existing natural gas pipelines for hydrogen blending and transportation is an effective way to achieve large-scale utilization of hydrogen. However, due to the physical properties of hydrogen, it is easy to cause pipe failure, leakage and diffusion, combustion and explosion, and other accidents. Its failure form can be compared with oil and gas pipelines, mainly divided into corrosion, third-party damage, geological disasters, misoperation and other aspects. From a theoretical analysis, the failure probability of hydrogen blending pipelines caused by third-party damage, geological disasters, misoperation and other reasons should be basically the same as that of oil and gas pipelines. Because hydrogen molecules are very small and diffuse quickly, hydrogen embrittlement, hydrogen corrosion, hydrogen cracking and other problems are prone to occur during the hydrogenation and transportation of natural gas pipelines, which increases the risk of pipeline failure. It is necessary to explore the compatibility of pipes and their welded joints with hydrogen-blended natural gas during the hydrogenation and transportation of natural gas pipelines. Summary of the invention

[0003] In view of the above problems, the present invention is proposed to provide a hydrogen-blended natural gas transmission pipeline failure simulation system and related simulation methods that overcome the above problems or at least partially solve the above problems.

[0004] In a first aspect, an embodiment of the present invention provides a failure simulation system for a hydrogen-blended natural gas transmission pipeline, comprising:

[0005] Injection gas recovery system, mixed gas circulation pipeline and monitoring system;

[0006] The gas injection recovery system is connected to the mixed gas circulation pipeline to form a mixed gas closed-loop transmission passage for simulating the injection and recovery of hydrogen-blended natural gas;

[0007] The monitoring system is used to monitor the operating state of the gas in the mixed gas circulation pipeline to obtain monitoring data.

[0008] In one embodiment, the gas injection recovery system comprises:

[0009] Hydrogen gas source, natural gas source, mixing tank, buffer tank and booster mechanism;

[0010] The hydrogen gas source and the natural gas source are connected to the mixing tank respectively, and the mixing tank is used to mix hydrogen and natural gas in different proportions;

[0011] The mixing tank and the buffer tank are respectively connected to two ends of the mixed gas circulation pipeline;

[0012] The pressurizing mechanism is connected to the mixing tank and the buffer tank respectively, and is used for pressurizing the gas in the buffer tank and then passing it into the mixing tank.

[0013] In one embodiment, the mixing tank is further provided with a first pressure transmitter;

[0014] The buffer tank is also provided with a second pressure transmitter.

[0015] The first pressure transmitter and the second pressure transmitter are used to monitor the gas pressure in the tank in real time.

[0016] In one embodiment, the boosting mechanism comprises: a boosting pump and a power gas source;

[0017] The inlet of the booster pump is connected to the buffer tank, and the outlet of the booster pump is connected to the mixing tank;

[0018] The power gas source is connected to the booster pump and is used to provide power to the booster pump.

[0019] In one embodiment, the above-mentioned hydrogen-blended natural gas transmission pipeline failure simulation system further includes: a plurality of pressure reducing valves;

[0020] The plurality of pressure reducing valves are connected to gas outlets of the hydrogen gas source, the natural gas source and the power gas source, and the pressure reducing valves are used to adjust the output pressure of the gas source.

[0021] In one embodiment, the circulation pipeline comprises:

[0022] At least one steel pipe section and at least one glass pipe section, the steel pipe section and the glass pipe section are connected.

[0023] In one embodiment, the monitoring system includes any one or more of the following:

[0024] Temperature and pressure transmitters, UV imagers, ultrasonic thickness gauges, vibration detectors, and magnetic detectors;

[0025] The temperature and pressure transmitter, ultrasonic thickness gauge, and vibration detector are respectively arranged on the steel pipe section of the circulation pipeline;

[0026] The ultraviolet imager is arranged toward the glass tube section of the circulation pipeline, and is used to photograph the gas state in the glass pipeline and the entire circulation pipeline, and monitor the distribution of hydrogen in the circulation pipeline and the overall leakage state of the circulation pipeline;

[0027] The temperature and pressure transmitter is used to monitor the temperature and pressure in the circulation pipeline in real time;

[0028] The ultrasonic thickness gauge is used to monitor the change of the wall thickness of the circulation pipeline;

[0029] The vibration detector is used to monitor the vibration of the circulation pipeline when the gas flows in the circulation pipeline;

[0030] The magnetic detector is used to monitor the change of magnetic field of the steel pipe wall when the circulating pipeline is loaded.

[0031] In one embodiment, the steel pipe section comprises:

[0032] Various types of steel pipe sections made of different steel materials and / or different welding methods are used to replace each other to simulate working conditions with different operating pressures.

[0033] In one embodiment, a first ball valve is further provided at the connection between the end of the mixing tank and the mixed gas circulation pipeline;

[0034] A second ball valve is also provided at the connection between the end of the buffer tank and the mixed gas circulation pipeline.

[0035] In a second aspect, an embodiment of the present invention provides a state simulation method for a hydrogen-blended natural gas transmission pipeline, comprising:

[0036] By using the aforementioned hydrogen-blended natural gas transmission pipeline failure simulation system, different operating conditions of hydrogen-blended natural gas with different proportions under different operating pressures and / or in different types of steel pipelines are simulated;

[0037] The monitoring data of different working conditions are obtained and saved through the monitoring system in the hydrogen-blended natural gas transmission pipeline failure simulation system.

[0038] The beneficial effects of the above technical solution provided by the embodiment of the present invention include at least:

[0039] The hydrogen-blended natural gas transmission pipeline failure simulation system and related simulation method provided in the embodiment of the present invention construct a gas circulation system that simulates the circulation process of hydrogen-blended natural gas through a gas injection recovery system, a mixed gas circulation pipeline and a monitoring system, so that a certain proportion of hydrogen-blended natural gas circulates in the pipeline to achieve setting of different operating pressures, chemical elements, materials, welding and other conditions, and use one or more monitoring means to monitor the operating status of the pipeline and collect corresponding basic monitoring data, thereby providing the possibility of establishing a hydrogen-blended natural gas transmission pipeline status monitoring database and providing basic data support for the safe and efficient operation of the hydrogen-blended natural gas transmission pipeline.

[0040] Furthermore, the monitoring system includes temperature and pressure transmitters, ultraviolet imagers, ultrasonic thickness gauges, vibration detectors and magnetic detectors, which can monitor the pipeline operation status through a variety of technical means such as sound, light, electricity and magnetism, and realize the collection of more comprehensive monitoring data.

[0041] Furthermore, the mixed gas circulation pipeline can simulate different types of circulation pipelines by simulating steel pipe sections of various materials and steel pipe sections with different welding methods, so as to better simulate the conditions of steel pipe sections in actual scenarios.

[0042] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0043] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0045] Figure 1 It is a schematic diagram of the structure of a failure simulation system for a hydrogen-blended natural gas transmission pipeline according to an embodiment of the present invention;

[0046] Figure 2 This is a flow chart of a method for simulating the state of a hydrogen-blended natural gas transmission pipeline in an embodiment of the present invention.

[0047] Description of reference numerals:

[0048] 1 Hydrogen gas source 2 Natural gas source 3 Power gas source 4 First pressure reducing valve

[0049] 5 Second pressure reducing valve 6 Third pressure reducing valve 7 Mixing tank 8 First pressure transmitter 9 First ball valve

[0050] 10 Temperature and pressure transmitter 11 Ultrasonic thickness gauge 12 Vibration detector 13 Magnetic detector

[0051] 14 Steel pipe section 15 UV imager 18 Second ball valve 19 Second pressure transmitter

[0052] 20 buffer tank 21 booster pump DETAILED DESCRIPTION

[0053] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0054] The inventors of the present application have discovered that in order to better study possible failure problems such as hydrogen embrittlement, hydrogen corrosion, hydrogen cracking, etc. that may occur in pipelines made of different materials, with different welding methods, and / or under different gas pressures, an experimental system can be designed that can analyze and study multiple aspects such as operating pressure, materials, and welding, so as to simulate the actual transportation scenario of the hydrogen-blended natural gas pipeline, and thereby obtain monitoring data under different working conditions, thereby providing basic data support for the safe and efficient operation of the hydrogen-blended natural gas pipeline.

[0055] The hydrogen-blended natural gas transmission pipeline failure simulation system provided by the embodiment of the present invention includes the following parts:

[0056] Injection gas recovery system, mixed gas circulation pipeline and monitoring system;

[0057] The gas injection recovery system is connected to the mixed gas circulation pipeline to form a mixed gas closed-loop transmission path to simulate the injection and recovery of hydrogen-blended natural gas;

[0058] The monitoring system is used to monitor the operating state of the gas in the mixed gas circulation pipeline to obtain monitoring data.

[0059] The above-mentioned mixed gas refers to hydrogen-blended natural gas, that is, natural gas mixed with hydrogen, and the mixing ratio can be adjusted according to the actual situation being simulated.

[0060] After passing through the mixed gas circulation pipeline, the mixed gas will return to the gas injection recovery system. In this process, the monitoring system can be set on the mixed gas circulation pipeline, or near the mixed gas circulation pipeline to realize the status monitoring of the mixed gas, pipeline, etc. in the mixed gas circulation pipeline.

[0061] Specifically, please refer to Figure 1 In the example of the failure simulation system of the hydrogen-blended natural gas transmission pipeline shown, the above-mentioned gas injection recovery system may specifically include:

[0062] Hydrogen gas source 1, natural gas source 2, mixing tank 7, buffer tank 20 and boosting mechanism; wherein:

[0063] The hydrogen gas source 1 and the natural gas source 2 are respectively connected to the mixing tank 7, and the mixing tank 7 is used to mix hydrogen and natural gas in different proportions;

[0064] The mixing tank 7 and the buffer tank 20 are respectively connected to the two ends of the mixed gas circulation pipeline;

[0065] The pressurizing mechanism is connected to the mixing tank 7 and the buffer tank 20 respectively, and is used for pressurizing the gas in the buffer tank 20 and then passing it into the mixing tank 7.

[0066] The hydrogen gas source may be, for example, a standard gas cylinder filled with high-pressure hydrogen, and the natural gas source may be, for example, a standard gas cylinder filled with high-pressure natural gas.

[0067] Further, refer to Figure 1 As shown, the mixing tank 7 may also be provided with a first pressure transmitter 8;

[0068] The buffer tank 20 is also provided with a second pressure transmitter 19 .

[0069] The first pressure transmitter 8 and the second pressure transmitter 19 are used to monitor the gas pressure in the mixing tank 7 and the buffer tank 20 in real time.

[0070] Further, refer to Figure 1 As shown, the boosting mechanism specifically includes: a boosting pump 21 and a power gas source 3;

[0071] The inlet of the booster pump 21 is connected to the buffer tank 20, and the outlet of the booster pump 21 is connected to the mixing tank 7;

[0072] The power gas source 3 is connected to the booster pump 21 for providing power to the booster pump 21 .

[0073] Furthermore, the hydrogen-blended natural gas transmission pipeline failure simulation system may also include: a plurality of pressure reducing valves;

[0074] A plurality of pressure reducing valves are connected to the gas outlets of the hydrogen gas source, the natural gas source and the power gas source, and the pressure reducing valves are used to adjust the output pressure of the gas source.

[0075] For example, refer to Figure 1 As shown, the first pressure reducing valve 4 is connected to the outlet of the hydrogen gas source, the second pressure reducing valve 5 is connected to the outlet of the natural gas source, and the third pressure reducing valve 6 is connected to the outlet of the power gas source.

[0076] In order to better monitor the internal gas condition of the mixed gas circulation pipeline, the mixed gas circulation pipeline may specifically include: at least one steel pipe section and at least one glass pipe section, wherein the steel pipe section and the glass pipe section are connected.

[0077] The steel pipe sections and glass pipe sections can be staggered or Figure 1 The method shown is mainly composed of a steel tube section 14, with a small part of it being set as a glass tube section 16 for easy observation.

[0078] The embodiment of the present invention does not limit the number and arrangement of the steel tube segments and the glass tube segments.

[0079] The glass tube section can be made of high-pressure resistant glass to meet the transmission requirements of high-pressure gas.

[0080] Further, refer to Figure 1 As shown, the above monitoring system may include any one or more of the following:

[0081] Temperature and pressure transmitter 10, ultraviolet imager 15, ultrasonic thickness gauge 11, vibration detector 12 and magnetic detector 13; wherein:

[0082] The temperature and pressure transmitter 10, the ultrasonic thickness gauge 11, the vibration detector 12, etc. can be respectively arranged on the steel pipe section 14 of the circulation pipeline;

[0083] The ultraviolet imager 15 is arranged toward the glass tube section 16 of the circulation pipeline, and is used to photograph the gas state in the glass tube section 16 and the entire circulation pipeline (including the glass tube section and the steel tube section), and monitor the distribution of hydrogen in the circulation pipeline and the overall leakage state of the entire circulation pipeline;

[0084] The temperature and pressure transmitter 10 is used to monitor the temperature and pressure in the circulation pipeline in real time;

[0085] The ultrasonic thickness gauge 11 is used to monitor the change of the wall thickness of the circulation pipeline;

[0086] The vibration detector 12 is used to monitor the vibration of the circulation pipeline when the gas flows in the circulation pipeline;

[0087] The magnetic detector 13 is used to monitor the change of magnetic field of the steel pipe wall when the circulating pipeline is loaded.

[0088] In order to better conduct simulation experimental research on operating pressure, chemical elements, materials, welding and other aspects, different types of steel pipe sections can be simulated in the embodiment of the present invention, that is, the above-mentioned steel pipe sections can include multiple types of steel pipe sections, for example: multiple types of steel pipe sections made of different steel materials and / or different welding methods, which are used to replace and simulate working conditions with different operating pressures.

[0089] The above monitoring system can use sound, light, electricity, magnetism and other technologies to monitor the operating status of the pipeline and collect corresponding basic monitoring data to comprehensively reflect the various conditions of the hydrogen-blended natural gas transmission pipeline.

[0090] In the process of simulating the transportation of hydrogen-blended natural gas pipelines, different types of steel pipe sections can be used and / or the gas operating pressure can be adjusted to achieve simulated experimental research on the pipeline operating status under different operating pressures, chemical elements, materials, welding and other conditions.

[0091] Further, refer to Figure 1 As shown, a first ball valve 9 is further provided at the connection between the mixing tank 7 and the end of the mixed gas circulation pipeline;

[0092] A second ball valve 18 is also provided at the connection between the buffer tank 20 and the end of the mixed gas circulation pipeline.

[0093] The first ball valve 9 and the second ball valve 18 can realize the control of the output of the mixing tank 7 and the control of the input of the buffer tank 20 .

[0094] Based on the same inventive concept, an embodiment of the present invention further provides a state simulation method for a hydrogen-blended natural gas transmission pipeline. Since the principles of the problems solved by these methods are similar to those of the aforementioned hydrogen-blended natural gas transmission pipeline failure simulation system, the implementation of the method can refer to the implementation of the aforementioned system, and the repeated parts will not be repeated.

[0095] Reference Figure 2 As shown, a state simulation method for a hydrogen-blended natural gas transmission pipeline provided by an embodiment of the present invention includes the following steps:

[0096] S21. By using the aforementioned hydrogen-blended natural gas pipeline failure simulation system, different operating conditions of hydrogen-blended natural gas at different operating pressures and / or in different types of steel pipelines are simulated;

[0097] S22. Obtain and save monitoring data of different working conditions through the monitoring system in the hydrogen-blended natural gas transmission pipeline failure simulation system.

[0098] The hydrogen-blended natural gas transmission pipeline failure simulation system and related simulation method provided in the embodiment of the present invention construct a gas circulation system that simulates the circulation process of hydrogen-blended natural gas through a gas injection recovery system, a mixed gas circulation pipeline and a monitoring system, so that a certain proportion of hydrogen-blended natural gas circulates in the pipeline to achieve setting of different operating pressures, chemical elements, materials, welding and other conditions, and use one or more monitoring means to monitor the operating status of the pipeline and collect corresponding basic monitoring data, thereby providing the possibility of establishing a hydrogen-blended natural gas transmission pipeline status monitoring database and providing basic data support for the safe and efficient operation of the hydrogen-blended natural gas transmission pipeline.

[0099] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A hydrogen-blended natural gas pipeline failure simulation system, characterized in that: include: Injection gas recovery system, mixed gas circulation pipeline and monitoring system; The gas injection recovery system is connected to the mixed gas circulation pipeline to form a mixed gas closed-loop transmission passage for simulating the injection and recovery of hydrogen-blended natural gas; The monitoring system is used to monitor the operating state of the gas in the mixed gas circulation pipeline to obtain monitoring data.

2. The system according to claim 1, characterized in that The gas injection recovery system comprises: Hydrogen gas source, natural gas source, mixing tank, buffer tank and booster mechanism; The hydrogen gas source and the natural gas source are connected to the mixing tank respectively, and the mixing tank is used to mix hydrogen and natural gas in different proportions; The mixing tank and the buffer tank are respectively connected to two ends of the mixed gas circulation pipeline; The pressurizing mechanism is connected to the mixing tank and the buffer tank respectively, and is used for pressurizing the gas in the buffer tank and then passing it into the mixing tank.

3. The system according to claim 2, characterized in that The mixing tank is also provided with a first pressure transmitter; The buffer tank is also provided with a second pressure transmitter. The first pressure transmitter and the second pressure transmitter are used to monitor the gas pressure in the tank in real time.

4. The system according to claim 1, characterized in that The boosting mechanism comprises: a boosting pump and a power gas source; The inlet of the booster pump is connected to the buffer tank, and the outlet of the booster pump is connected to the mixing tank; The power gas source is connected to the booster pump and is used to provide power to the booster pump.

5. The system according to claim 4, characterized in that Also includes: Multiple pressure relief valves; The plurality of pressure reducing valves are connected to gas outlets of the hydrogen gas source, the natural gas source and the power gas source, and the pressure reducing valves are used to adjust the output pressure of the gas source.

6. The system according to claim 1, characterized in that The circulation pipeline comprises: At least one steel pipe section and at least one glass pipe section, the steel pipe section and the glass pipe section are connected.

7. The system according to claim 6, characterized in that The monitoring system comprises any one or more of the following: Temperature and pressure transmitters, UV imagers, ultrasonic thickness gauges, vibration detectors, and magnetic detectors; The temperature and pressure transmitter, ultrasonic thickness gauge, and vibration detector are respectively arranged on the steel pipe section of the circulation pipeline; The ultraviolet imager is arranged toward the glass tube section of the circulation pipeline, and is used to photograph the gas state in the glass pipeline and the entire circulation pipeline, and monitor the distribution of hydrogen in the circulation pipeline and the overall leakage state of the circulation pipeline; The temperature and pressure transmitter is used to monitor the temperature and pressure in the circulation pipeline in real time; The ultrasonic thickness gauge is used to monitor the change of the wall thickness of the circulation pipeline; The vibration detector is used to monitor the vibration of the circulation pipeline when the gas flows in the circulation pipeline; The magnetic detector is used to monitor the change of magnetic field of the steel pipe wall when the circulating pipeline is loaded.

8. The system according to claim 6, characterized in that The steel pipe section comprises: Various types of steel pipe sections made of different steel materials and / or different welding methods are used to replace each other to simulate working conditions with different operating pressures.

9. The system according to claim 6, characterized in that A first ball valve is also provided at the connection between the end of the mixing tank and the mixed gas circulation pipeline; A second ball valve is also provided at the connection between the end of the buffer tank and the mixed gas circulation pipeline.

10. A method for simulating the state of a hydrogen-blended natural gas transmission pipeline, characterized in that: include: By using the hydrogen-blended natural gas transmission pipeline failure simulation system as described in any one of claims 1 to 9, different operating conditions of hydrogen-blended natural gas with different proportions under different operating pressures and / or in different types of steel pipelines are simulated; The monitoring data of different working conditions are obtained and saved through the monitoring system in the hydrogen-blended natural gas transmission pipeline failure simulation system.

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