Multi-angle mixing distribution detection device and method for hydrogen-doped natural gas pipeline

Abstract

The invention belongs to the technical field of natural gas hydrogen doping, and particularly relates to a hydrogen-doped natural gas pipeline multi-angle mixing distribution detection device and method.The device comprises a control system and a device body, the device body comprises a rack, a vertical pipe and an angle adjusting mechanism connected with the vertical pipe, and the angle adjusting mechanism comprises a winch; the output end of the winch is provided with a first gear, the first gear is provided with a steel strand, the other end of the steel strand is connected with a second gear, the second gear is connected with a vertical pipe, and two ends of the vertical pipe are connected with detection assemblies; a gas inlet is formed in one end of the vertical pipe and connected with a gas inlet pipe, and the gas inlet pipe comprises a nitrogen gas inlet pipe, a standard gas inlet pipe, a vacuum pipe and a first blow-down pipe; by introducing hydrogen-doped natural gas with different pressures and natural gas with different hydrogen doping proportions and setting different vertical pipe inclination angles, whether the hydrogen-doped natural gas has a stratification behavior in a standing state can be systematically analyzed and verified, and the influence of factors such as the pressure of the hydrogen-doped natural gas, the hydrogen doping proportion and the inclination angle on the stratification phenomenon is discussed; and a scientific basis is provided for storage and transportation of hydrogen-doped natural gas.

Description

Technical Field

[0001] The present invention belongs to the technical field of natural gas hydrogen blending, and in particular relates to a multi-angle blending distribution detection device and method for a hydrogen-blended natural gas pipeline. Background Art

[0002] With the growth of global energy demand and the increasing pressure of climate change, clean and sustainable energy has become an important task for all countries. Hydrogen energy is a clean energy that only produces water and almost no greenhouse gases after complete combustion. However, the promotion of hydrogen energy still faces challenges such as infrastructure, technology and safety. By introducing hydrogen into natural gas, an alternative solution can be provided to achieve low carbonization without significantly increasing the existing natural gas infrastructure.

[0003] Due to the significant difference in density between hydrogen and natural gas, stratification may occur between hydrogen and natural gas, causing the top of the pipeline to be filled with high concentrations of hydrogen, while natural gas is mainly distributed at the bottom of the pipeline. This pipeline stratification may cause excessive hydrogen concentration in local areas of the pipeline and create a risk of hydrogen embrittlement, which in turn poses a safety hazard to hydrogen-blended natural gas pipelines. Therefore, it has become a research focus.

[0004] At present, studies have shown that hydrogen and natural gas will not be stratified in flowing hydrogen-blended natural gas pipelines, but there are no experiments that can explore the stratification phenomenon of hydrogen-blended natural gas in static pipelines at different inclination angles. Therefore, a multi-angle blending distribution detection device and detection method that can explore hydrogen-blended natural gas pipelines are designed. It can systematically analyze and verify whether hydrogen-blended natural gas has stratification behavior in static pipelines at different inclination angles, and can explore the influence of factors such as inclination angle, hydrogen blending ratio and pressure on the stratification phenomenon, thereby providing a scientific basis for the storage and transportation of hydrogen-blended natural gas. The research results can not only provide theoretical support for the industrial application of hydrogen-blended natural gas, but also lay the foundation for the large-scale promotion of hydrogen energy in the future. This research has important practical significance for promoting the transformation of energy structure and achieving carbon neutrality goals. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides a multi-angle blending distribution detection device and method for a hydrogen-blended natural gas pipeline, which solves the problem that the existing detection devices cannot systematically analyze and verify whether there is stratification behavior of hydrogen-blended natural gas in a static pipeline at different inclination angles, and cannot simultaneously explore the influence of factors such as hydrogen blending ratio and pressure on the stratification phenomenon.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is:

[0007] Provided is a multi-angle blending distribution detection device for a hydrogen-blended natural gas pipeline, comprising a control system and a device body connected to the control system, the device body comprising a frame, a riser arranged on the frame, and an angle adjustment mechanism connected to the riser, the angle adjustment mechanism comprising a winch, a first gear is arranged at the output end of the winch, a steel strand is arranged on the first gear, a second gear is connected to the other end of the steel strand, the second gear is connected to the riser, and detection components are connected to both ends of the riser;

[0008] An air inlet is arranged at one end of the vertical pipe, and the air inlet is connected to an air inlet pipe. The air inlet pipe comprises a nitrogen air inlet pipe, a standard air inlet pipe, a vacuum pipe and a first vent pipe.

[0009] The beneficial effects of adopting the above technical solution are as follows: the riser in the device body serves as the main structure for carrying natural gas with different hydrogen blending ratios. The angle adjustment mechanism can realize the rotation of the riser by 0 to 90 degrees, which meets the experimental requirements of different rotation angles and can better simulate the actual situation of the hydrogen-blended natural gas pipeline at different pipeline inclination angles. The angle adjustment mechanism uses a gear transmission method to realize the rotation and angle adjustment of the riser, which has high transmission efficiency and good stability. In addition, the winch has a self-locking function, which ensures the stability of the riser during the experiment and can maintain the set angle state for a long time without being offset by external forces. The monitoring component can collect and record the pressure and hydrogen concentration data during the experiment in real time, which effectively improves the detection efficiency and detection accuracy, thereby improving the accuracy and reliability of the experimental results.

[0010] In addition, one end of the riser is connected to the air inlet pipe, and the air inlet pipe includes a nitrogen air inlet pipe, a standard gas air inlet pipe, a vacuum pipe and a first vent pipe. The nitrogen air inlet pipe is used to connect to the nitrogen bottle to introduce nitrogen into the device. The standard gas air inlet pipe is used to connect to the standard gas bottle to introduce standard gas (natural gas with a certain hydrogen blending ratio). The first vent pipe is used to discharge excess gas or waste gas to ensure the stability and safety of the device. The vacuum pipe is connected to the vacuum pump for vacuuming the inside of the device to ensure the purity of the gas and the cleanliness of the inside of the device. During the experiment, by replacing hydrogen-blended natural gas with different hydrogen blending ratios and adjusting the pressure, the influence of factors such as hydrogen blending ratio and pressure on the stratification phenomenon can be explored.

[0011] The control system can realize precise control and automated operation of the entire experimental device, ensuring the stability of the experimental process and the accuracy of the data. The control system can adjust the pressure and angle to simulate hydrogen-blended natural gas pipelines with different inclination angles, which is conducive to systematically analyzing and verifying the stratification behavior of hydrogen-blended natural gas in a static state, and can explore the influence of factors such as hydrogen blending ratio and pressure on the stratification phenomenon, providing a scientific basis for the storage and transportation of hydrogen-blended natural gas.

[0012] Furthermore, the detection device includes a first analyzer and a second analyzer, the first analyzer is arranged at one end of the standpipe, and the second analyzer is arranged at the other end of the standpipe; the first analyzer is provided with a second vent pipe and a first connecting hose; the second analyzer is provided with a third vent pipe and a second connecting hose;

[0013] The first connecting hose and the second connecting hose are both connected to the standpipe, and analyzer pressure reducing valves are arranged at the connection points between the standpipe and the first connecting hose and the second connecting hose.

[0014] The beneficial effects of adopting the above technical solution are: the first analyzer and the second analyzer are arranged at the two ends of the riser, and the hydrogen-blended natural gas in the riser will flow through the analyzers. When the riser is at different inclination angles, the hydrogen concentration data at both ends of the riser can be monitored in real time by the first analyzer and the second analyzer, so as to realize the exploration of the stratification behavior of the hydrogen-blended natural gas in a static state in the multi-angle hydrogen-blending pipeline.

[0015] Furthermore, both the first analyzer and the second analyzer have built-in flow meters.

[0016] Furthermore, an inlet valve and an equipment main valve are provided on the air inlet pipe, a nitrogen pressure reducing valve and a nitrogen inlet valve are provided on the nitrogen inlet pipe, a standard gas pressure reducing valve, a standard gas inlet valve and a post-meter valve are provided on the standard gas inlet pipe, a vacuum valve is provided on the vacuum pipe, and a first vent valve is provided on the first vent pipe.

[0017] Furthermore, the frame includes a supporting base plate, a first supporting frame and a second supporting frame arranged on the supporting base plate, a connecting rod is threadedly connected between the first supporting frame and the second supporting frame, the connecting rod is connected to the vertical pipe, and a second gear is arranged on the connecting rod.

[0018] The beneficial effects of adopting the above technical solution are as follows: the supporting base plate serves as the foundation of the entire frame, providing a stable supporting platform, ensuring the stability of the entire device during the experiment, and the first supporting frame, the second supporting frame and the connecting rod are used to fix and support the riser, and the connecting rod and the riser are connected by welding. When the first gear at the output end of the winch rotates, the second gear can be driven to rotate under the action of the steel strand, and then the connecting rod can be driven to rotate. The rotation of the connecting rod can drive the riser to rotate, thereby adjusting the rotation angle of the riser.

[0019] Furthermore, pressure gauges are provided at both ends of the riser, and a dividing instrument is provided in the middle.

[0020] The beneficial effects of adopting the above technical solution are: 0-6MPa pressure gauges are set at both ends of the riser to monitor the internal pressure of the riser in real time, and the dividing instrument can accurately measure and display the inclination angle of the riser, ensuring the accuracy of the inclination angle of the riser in each experiment, which is conducive to systematically analyzing and verifying whether there is stratification behavior in hydrogen-blended natural gas with different hydrogen blending ratios in a static pipeline, providing an important scientific basis for the practical application of hydrogen-blended natural gas.

[0021] A method for detecting multi-angle mixing distribution of hydrogen-blended natural gas pipelines comprises the following steps:

[0022] S1: Equipment inspection

[0023] Check whether the multi-angle blending distribution detection device of the hydrogen-blended natural gas pipeline is in normal working condition, including whether the angle adjustment mechanism can flexibly adjust the tilt angle, whether the detection components are working properly, whether the pipeline and device connections are well sealed and in normal working condition; and ensure that the first vent pipe, the second vent pipe and the third vent pipe are connected to the outdoor atmosphere;

[0024] S2: Nitrogen replaces other gases

[0025] Connect the nitrogen inlet pipe to the nitrogen bottle, close the vacuum valve, the first vent valve and the standard gas inlet valve, open the equipment main valve, the valve after the meter, the inlet valve and the analyzer pressure regulating valve, and then open the nitrogen pressure reducing valve and the nitrogen inlet valve in sequence to input nitrogen. After the pressure indication is stable, open the first vent valve. After the pressure indication returns to zero, close the first vent valve. Repeat the nitrogen charging and discharging steps 5 to 10 times to complete the replacement of nitrogen with other gases;

[0026] S3: Vacuuming

[0027] Connect the vacuum pipe to the vacuum pump, open the inlet valve, the valve after the meter and the vacuum valve, close other pipeline valves, close the vacuum valve when the preset vacuum pressure is reached, cut off the power supply of the vacuum pump, and complete the vacuuming of the standpipe and the air inlet pipe;

[0028] S4: Introduce standard gas

[0029] Turn on the analyzer for preheating. After preheating, connect the standard gas inlet pipe to the standard gas bottle, open the standard gas pressure reducing valve and the standard gas inlet valve, close the inlet valve and the standard gas inlet valve after reaching the preset pressure, and then open the first vent valve. After the standard gas in the inlet pipe is discharged, close the first vent valve, open the nitrogen inlet valve, fill with nitrogen at a certain pressure, then close the nitrogen inlet valve, open the first vent valve, and repeat the nitrogen charging and discharging steps 5 to 10 times;

[0030] S5: Adjusting the seat tube angle and recording data

[0031] Disconnect the air intake pipe from the standpipe, adjust the standpipe setting angle by hand-cranked winch, and after adjusting to the desired angle, keep the standpipe still for 3 to 10 minutes, adjust the flow meter, and monitor and record the hydrogen concentration data displayed by the first analyzer and the second analyzer in real time;

[0032] S6: Replacement of standard gas with different hydrogen ratios or pressures

[0033] Connect the air inlet pipe to the standpipe, open the nitrogen inlet valve, close the nitrogen inlet valve after a certain pressure of nitrogen is filled, open the first vent valve, repeat the nitrogen filling and discharging steps 5 to 10 times, open the inlet valve and the first vent valve after the pressure indication returns to zero, and repeat steps S2 to S5;

[0034] S7: Processing after the experiment

[0035] Connect the air inlet pipe to the riser, open the nitrogen inlet valve, fill in a certain pressure of nitrogen, then close the nitrogen inlet valve, open the first vent valve, and use nitrogen to discharge the air in the air inlet pipe; then open the inlet valve and the nitrogen inlet valve, and close the nitrogen inlet valve after a certain pressure of nitrogen is filled in, open the first vent valve, repeat the nitrogen filling and discharging steps 5 to 10 times, discharge the residual standard gas in the device, close the first vent valve, open the inlet valve and then close the analyzer in sequence to end the experiment.

[0036] The beneficial effects of adopting the above technical method are as follows: the equipment inspection in S1 can ensure that the angle adjustment mechanism can be flexibly adjusted between different tilt angles (such as 0°, 45°, 90°), and can avoid air leakage and maintain the normal operation of valves, pressure gauges and analyzers; the pressure after decompression by the nitrogen pressure reducing valve in S2 is 1.0-1.2MPa, and the accuracy and safety of the experiment are ensured by replacing other gases in the device with nitrogen; the vacuuming in S3 can further clean the gas in the pipeline of the device, remove the residual gas in the pipeline, and further improve the accuracy of the experiment; the introduction of standard gas in S4 can introduce natural gas with a specific hydrogen blending ratio into the device, which is conducive to simulating different hydrogen blending ratios and different tilt angles, and exploring the influence of factors such as hydrogen blending ratio and pressure on stratification, thereby providing a reference for the storage of hydrogen-blended natural gas. In S5, after the natural gas with a specific hydrogen blending ratio is introduced, the inclination angle of the riser is adjusted by the angle adjustment mechanism, and the hydrogen concentration data of the gas is observed and recorded in real time, so as to realize the monitoring of the hydrogen distribution and content in the hydrogen-blended natural gas in the hydrogen-blended natural gas pipeline with different inclination angles, which is conducive to the systematic analysis of the distribution law of hydrogen concentration in the pipe at different hydrogen blending ratios and different inclination angles; in S6, by repeating the operations of S2-S5, the static stratification phenomenon of hydrogen-blended natural gas with different hydrogen blending ratios in the hydrogen-blended pipeline at multiple angles can be explored. In addition, the input pressure of the standard gas can be reduced by adjusting the standard gas pressure reducing valve to explore the influence of different pressures on the static stratification phenomenon; in S7, the residual gas in the pipeline is emptied and the valves and analyzers are closed to ensure the safety of the device and prepare for the next experiment.

[0037] In summary, the multi-angle mixing distribution detection device and method for hydrogen-blended natural gas pipeline provided by the present invention have the following beneficial effects:

[0038] (1) The detection device in the present invention has a multi-channel air intake and venting control function, allowing multiple gases to be introduced at the same time, and is equipped with a venting pipe, which ensures the stability and safety of the system, improves the flexibility and convenience of experimental operation, and through the vacuum tube, can ensure the system cleanliness and gas purity before the introduction of new gas, which is conducive to reducing experimental errors and ensuring experimental safety.

[0039] (2) The angle adjustment mechanism of the present invention can realize the rotation of the riser from 0 to 90 degrees through the cooperation of the self-locking winch and the indexing instrument, so as to meet the experimental requirements under different inclination angles of the riser, and facilitate the systematic analysis and verification of whether there is stratification behavior of hydrogen-blended natural gas in a static state.

[0040] (3) The detection method of the present invention conducts experiments under different hydrogen blending ratios and tilt angles, and systematically records and analyzes the hydrogen concentration distribution of the gas, which is conducive to exploring the influence of factors such as hydrogen blending ratio and pressure on the stratification phenomenon, and provides a scientific basis for the storage and transportation of hydrogen-blended natural gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the structure of the device of the present invention;

[0042] Figure 2 It is a structural schematic diagram of the angle adjustment mechanism in the present invention;

[0043] Figure 3 Schematic diagram of data measured by the device and method of the present invention;

[0044] Among them, 1. frame; 2. riser; 3. winch; 4. first gear; 5. steel strand; 6. second gear; 7. air inlet; 8. air inlet pipe; 9. nitrogen inlet pipe; 10. standard gas inlet pipe; 11. vacuum tube; 12. first vent pipe; 13. first analyzer; 14. second analyzer; 15. analyzer pressure regulating valve; 16. flow meter; 17. equipment main valve; 18. nitrogen pressure reducing valve; 19. nitrogen inlet valve; 20. standard gas pressure reducing valve; 21. post-meter valve; 22. standard gas inlet valve; 23. first vent valve; 24. vacuum valve; 25. supporting substrate; 26. first supporting frame; 27. second supporting frame; 28. connecting rod; 29. ​​pressure gauge; 30. dividing instrument; 31. inlet valve; 32. second vent pipe; 33. first connecting hose; 34. third vent pipe; 35. second connecting hose. DETAILED DESCRIPTION

[0045] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0046] Example 1

[0047] like Figure 1 to Figure 3As shown, the present invention provides a multi-angle blending distribution detection device for a hydrogen-blended natural gas pipeline, including a control system and a device body connected to the control system, the device body including a frame 1, a riser 2 arranged on the frame 1 and an angle adjustment mechanism connected to the riser 2, the angle adjustment mechanism including a winch 3, a first gear 4 is arranged at the output end of the winch 3, a steel strand 5 is arranged on the first gear 4, the other end of the steel strand 5 is connected to a second gear 6, the second gear 6 is connected to the riser 2, and both ends of the riser 2 are connected to detection components; the riser 2 An air inlet 7 is provided at one end, and the air inlet 7 is connected to an air inlet pipe 8. The air inlet pipe 8 includes a nitrogen air inlet pipe 9, a standard air inlet pipe 10, a vacuum pipe 11 and a first vent pipe 12; an inlet valve 31 and an equipment main valve 17 are provided on the air inlet pipe 8, a nitrogen pressure reducing valve 18 and a nitrogen inlet valve 19 are provided on the nitrogen air inlet pipe 9, a standard air pressure reducing valve 20, a standard air inlet valve 22 and a post-meter valve 21 are provided on the standard air inlet pipe 10, a vacuum valve 24 is provided on the vacuum pipe 11, and a first vent valve 23 is provided on the first vent pipe 12.

[0048] The control system can realize precise control and automated operation of the entire experimental device, ensuring the stability of the experimental process and the accuracy of the data. The control system can adjust the pressure and angle to simulate the actual working conditions of hydrogen-blended natural gas pipelines with different inclination angles.

[0049] The riser 2 in the device body serves as the main structure for carrying natural gas with different hydrogen blending ratios. The angle adjustment mechanism can realize the rotation of the riser 2 by 0 to 90 degrees, which meets the experimental requirements of different rotation angles and can better simulate the actual situation of the hydrogen-blended natural gas pipeline at different inclination angles. The angle adjustment mechanism uses a gear transmission method to realize the rotation and angle adjustment of the riser 2, which has high transmission efficiency and good stability. In addition, the winch 3 has a self-locking function, which ensures the stability of the riser 2 during the experiment and can enable the riser 2 to maintain the set angle state for a long time without being offset by external forces. The monitoring component can collect and record the hydrogen concentration data during the experiment in real time, which effectively improves the detection efficiency and accuracy, thereby improving the accuracy and reliability of the experimental results.

[0050] In addition, one end of the riser 2 is connected to the intake pipe 8, and the intake pipe 8 includes a nitrogen intake pipe 9, a standard gas intake pipe 10, a vacuum pipe 11 and a first vent pipe 12. The nitrogen intake pipe 9 is used to connect with the nitrogen bottle to introduce nitrogen into the device, the standard gas intake pipe 10 is used to connect with the standard gas bottle to introduce gas with a certain hydrogen blending ratio, and the first vent pipe 12 is used to discharge excess gas or waste gas to ensure the stability and safety of the device; the vacuum pipe 11 is connected to the vacuum pump for vacuuming inside the device to ensure the purity of the gas and the cleanliness of the inside of the device. The detection device realizes the accurate detection and simulation of the hydrogen distribution in the hydrogen-blended natural gas pipeline at multiple angles through the synergistic effect of the control system, the angle adjustment mechanism, the detection component and other structures, and ensures the accuracy and reliability of the experimental results. It can systematically analyze and verify whether the hydrogen-blended natural gas has stratification behavior in a static state, and through the simulation of working conditions with different hydrogen blending ratios and different inclination angles, it is conducive to better explore the influence of factors such as hydrogen blending ratio and pressure on the stratification phenomenon.

[0051] like Figure 1 As shown, the detection device includes a first analyzer 13 and a second analyzer 14. The first analyzer 13 is arranged at one end of the riser 2, and the second analyzer 14 is arranged at the other end of the riser 2. The first analyzer 13 is provided with a second vent pipe 32 and a first connecting hose 33. The second analyzer 14 is provided with a third vent pipe 34 and a second connecting hose 35. The first connecting hose 33 and the second connecting hose 35 are both connected to the riser 2, and the analyzer pressure reducing valve 15 is provided at the connection between the riser 2 and the first connecting hose 33 and the second connecting hose 35. The first analyzer 13 and the second analyzer 14 are both thermal analyzers, which need to be preheated for 30 minutes before the experiment; and the flowmeter 16 uses a glass rotor flowmeter 16, and its opening is 50ml / min. During the experiment, the hydrogen-blended natural gas in the riser 2 will flow through the analyzer. When the riser 2 is at different inclination angles, the first analyzer 13 and the second analyzer 14 can be used to monitor the hydrogen concentration data at both ends of the riser 2 in real time, so as to realize the exploration of the stratification behavior of the hydrogen-blended natural gas in a static state in the multi-angle hydrogen-blending pipeline.

[0052] like Figure 1As shown, the frame 1 includes a supporting base plate 25, a first supporting frame 26 and a second supporting frame 27 arranged on the supporting base plate 25, a connecting rod 28 is threadedly connected between the first supporting frame 26 and the second supporting frame 27, the connecting rod 28 is connected to the vertical pipe 2, and a second gear 6 is arranged on the connecting rod 28; the supporting base plate 25 serves as the basis of the entire frame 1, providing a stable supporting platform to ensure the stability of the entire device during the experiment, and the first supporting frame 26, the second supporting frame 27 and the connecting rod 28 are used to fix and support the vertical pipe 2, and the connecting rod 28 is welded to the vertical pipe 2. When the first gear 4 at the output end of the winch 3 rotates, the second gear 6 can be driven to rotate under the action of the steel strand 5, and then the connecting rod 28 can be driven to rotate. The rotation of the connecting rod 28 can drive the vertical pipe 2 to rotate, thereby adjusting the rotation angle of the vertical pipe 2.

[0053] In this embodiment, pressure gauges 29 are provided at both ends of the riser 2, and a dividing meter 30 is provided in the middle thereof. The pressure gauges 29 with a range of 0 to 6 MPa are provided at both ends of the riser 2 to monitor the internal pressure of the riser 2 in real time. The dividing meter 30 can accurately measure and display the inclination angle of the riser 2, thereby ensuring the accuracy of the inclination angle of the riser 2 in each experiment, and facilitating the systematic analysis and verification of whether the hydrogen-blended natural gas has stratification behavior in a static state, thereby providing an important scientific basis for the practical application of the hydrogen-blended natural gas.

[0054] The detection method using the multi-angle blending distribution detection device for hydrogen-blended natural gas pipeline of the present invention comprises the following steps:

[0055] S1: Equipment inspection

[0056] Check whether the multi-angle blending distribution detection device of the hydrogen-blended natural gas pipeline is in normal working condition, including whether the angle adjustment mechanism can flexibly adjust the tilt angle, whether the detection component is working properly, whether the pipeline and device connections are well sealed and in normal working condition; and ensure that the first vent pipe 12, the second vent pipe 32 and the third vent pipe 34 are connected to the outdoor atmosphere;

[0057] S2: Nitrogen replaces other gases

[0058] Connect the nitrogen inlet pipe 9 to the nitrogen bottle, close the vacuum valve 24, the first vent valve 23 and the standard gas inlet valve 22, open the equipment main valve 17, the valve after the meter 21, the inlet valve 31 and the analyzer pressure regulating valve 15, and then open the nitrogen pressure reducing valve 18 and the nitrogen inlet valve 19 in sequence to input nitrogen. After the pressure gauge 29 shows a stable reading, open the first vent valve 23. After the pressure gauge 29 shows a zero reading, close the first vent valve 23. Repeat the nitrogen charging and discharging steps 5 to 10 times to complete the replacement of nitrogen with other gases.

[0059] S3: Vacuuming

[0060] Connect the vacuum pipe 11 to the vacuum pump, open the inlet valve 31, the valve after the meter 21 and the vacuum valve 24, close other pipeline valves, close the vacuum valve 24 when the preset vacuum pressure is reached, cut off the power supply of the vacuum pump, and complete the vacuuming of the standpipe 2 and the air inlet pipe 8;

[0061] S4: Introduce standard gas

[0062] Turn on the analyzer for preheating. After the preheating is completed, connect the standard gas inlet pipe 10 to the standard gas bottle, open the standard gas pressure reducing valve 20 and the standard gas inlet valve 22, close the inlet valve 31 and the standard gas inlet valve 22 after reaching the preset pressure, and then open the first vent valve 23. After the standard gas in the inlet pipe 8 is discharged, close the first vent valve 23, open the nitrogen inlet valve 19, fill with nitrogen of a certain pressure, then close the nitrogen inlet valve 19, open the first vent valve 23, and repeat the operation 5 to 10 times;

[0063] S5: Adjust the seat tube 2 angle and record data

[0064] Disconnect the air inlet pipe 8 from the standpipe 2, adjust the setting angle of the standpipe 2 by the hand-cranked winch 3, and after adjusting to the desired angle, keep the standpipe 2 still for 3 to 10 minutes, adjust the flow meter 16, and monitor and record the hydrogen concentration data displayed by the first analyzer 13 and the second analyzer 14 in real time;

[0065] S6: Replacement of standard gas with different hydrogen ratios or pressures

[0066] Connect the air inlet pipe 8 to the standpipe 2, open the nitrogen inlet valve 19, close the nitrogen inlet valve 19 after a certain pressure of nitrogen is charged, open the first vent valve 23, repeat the nitrogen charging and discharging steps 5 to 10 times, open the inlet valve 31 and the first vent valve 23 after the pressure gauge 29 returns to zero, and repeat steps S2 to S5;

[0067] S7: Processing after the experiment

[0068] Connect the air inlet pipe 8 and the standpipe 2, open the nitrogen inlet valve 19, fill in a certain pressure of nitrogen, then close the nitrogen inlet valve 19, open the first vent valve 23, and use the nitrogen to discharge the air in the air inlet pipe 8; then open the inlet valve 31 and the nitrogen inlet valve 19, and close the nitrogen inlet valve 19 after a certain pressure of nitrogen is filled in, open the first vent valve 23, repeat the nitrogen filling and discharging steps 5 to 10 times, discharge the residual standard gas in the device, close the first vent valve 23, open the inlet valve 31 and then turn off the analyzer in turn to end the experiment.

[0069] Example 2

[0070] Based on Example 1, this example provides gas analysis data of natural gas with a hydrogen blending ratio of 19.79% at a pressure of 4 MPa.

[0071] Table 1 Experimental data of static stratification at 4MPa and 19.79% hydrogen doping ratio

[0072]

[0073] In this embodiment, the maximum range of the first analyzer 13 and the second analyzer 14 is 30.00%. In view of the fact that in actual experiments, the error of the analyzer is 2% FS (FS represents the maximum range of the analyzer), there is an error of ±0.06% between the first analyzer 13 and the second analyzer 14. Figure 3 The upper limit of the measurement of the first analyzer 13 and the second analyzer 14 when considering the influence of the error during the experiment is 19.85%, and the lower limit is 19.73%. Figure 3 As can be seen from Table 1, the hydrogen contents at both ends of the riser 2 measured by the first analyzer 13 and the second analyzer 14 do not exceed the upper and lower limits, so there is no stratification phenomenon in the natural gas with a hydrogen blending ratio of 19.79% in the riser 2.

[0074] In summary, the multi-angle blending distribution detection device and method for hydrogen-blended natural gas pipeline provided by the present invention can systematically analyze and verify whether hydrogen-blended natural gas has stratification behavior in a static state by introducing hydrogen-blended natural gas with different pressures, natural gas with different hydrogen blending ratios and setting different riser inclination angles, and explore the influence of factors such as hydrogen-blended natural gas pressure, hydrogen blending ratio and inclination angle on the stratification phenomenon, providing a scientific basis for the storage and transportation of hydrogen-blended natural gas.

Claims

1. A multi-angle mixing distribution detection device for hydrogen-blended natural gas pipeline, characterized by: The invention comprises a control system and a device body connected to the control system, the device body comprising a frame (1), a standpipe (2) arranged on the frame (1) and an angle adjustment mechanism connected to the standpipe (2), the angle adjustment mechanism comprising a winch (3), a first gear (4) being arranged at the output end of the winch (3), a steel strand (5) being arranged on the first gear (4), the other end of the steel strand (5) being connected to a second gear (6), the second gear (6) being connected to the standpipe (2), and detection components being connected to both ends of the standpipe (2); An air inlet (7) is provided at one end of the standpipe (2), and the air inlet (7) is connected to an air inlet pipe (8), and the air inlet pipe (8) comprises a nitrogen air inlet pipe (9), a standard air inlet pipe (10), a vacuum pipe (11) and a first vent pipe (12).

2. The multi-angle mixing distribution detection device for hydrogen-blended natural gas pipeline according to claim 1 is characterized in that: The detection device comprises a first analyzer (13) and a second analyzer (14); the first analyzer (13) is arranged at one end of the standpipe (2), and the second analyzer (14) is arranged at the other end of the standpipe (2); the first analyzer (13) is provided with a second vent pipe (32) and a first connecting hose (33); the second analyzer (14) is provided with a third vent pipe (34) and a second connecting hose (35); The first connecting hose (33) and the second connecting hose (35) are both connected to the standpipe (2), and analyzer pressure reducing valves (15) are provided at the connection points between the standpipe (2) and the first connecting hose (33) and the second connecting hose (35).

3. The multi-angle mixing distribution detection device for hydrogen-blended natural gas pipeline according to claim 2 is characterized in that: The first analyzer (13) and the second analyzer (14) are both equipped with a flow meter (16).

4. The multi-angle mixing distribution detection device for hydrogen-blended natural gas pipeline according to claim 1 is characterized in that: The air inlet pipe (8) is provided with an inlet valve (31) and an equipment main valve (17); the nitrogen air inlet pipe (9) is provided with a nitrogen pressure reducing valve (18) and a nitrogen inlet valve (19); the standard air inlet pipe (10) is provided with a standard air pressure reducing valve (20), a standard air inlet valve (22) and a post-meter valve (21); the vacuum pipe (11) is provided with a vacuum valve (24); and the first vent pipe (12) is provided with a first vent valve (23).

5. The multi-angle mixing distribution detection device for hydrogen-blended natural gas pipeline according to claim 1 is characterized in that: The frame (1) comprises a supporting base plate (25), a first supporting frame (26) and a second supporting frame (27) arranged on the supporting base plate (25); a connecting rod (28) is threadedly connected between the first supporting frame (26) and the second supporting frame (27); the connecting rod (28) is connected to the vertical pipe (2); and a second gear (6) is arranged on the connecting rod (28).

6. The multi-angle mixing distribution detection device for hydrogen-blended natural gas pipeline according to claim 1 is characterized in that: Pressure gauges (29) are provided at both ends of the vertical pipe (2), and a dividing instrument (30) is provided in the middle thereof.

7. A multi-angle mixing distribution detection method for hydrogen-blended natural gas pipeline, characterized in that: The following steps are involved: S1: Equipment inspection Check whether the multi-angle blending distribution detection device of the hydrogen-blended natural gas pipeline is in normal working condition, including whether the angle adjustment mechanism can flexibly adjust the tilt angle, whether the detection component is working normally, and whether the connection between the pipeline and the device is well sealed and in normal working condition; and ensure that the first vent pipe (12), the second vent pipe (32) and the third vent pipe (34) are connected to the outdoor atmosphere; S2: Nitrogen replaces other gases Connect the nitrogen inlet pipe (9) to the nitrogen bottle, close the vacuum valve (24), the first vent valve (23) and the standard gas inlet valve (22), open the equipment main valve (17), the valve after the meter (21), the inlet valve (31) and the analyzer pressure regulating valve (15), then open the nitrogen pressure reducing valve (18) and the nitrogen inlet valve (19) in sequence to input nitrogen, open the first vent valve (23) after the pressure gauge (29) reading is stable, close the first vent valve (23) after the pressure gauge (29) reading returns to zero, repeat the nitrogen charging and discharging steps 5 to 10 times to complete the replacement of nitrogen with other gases; S3: Vacuuming Connect the vacuum pipe (11) to the vacuum pump, open the inlet valve (31), the post-meter valve (21) and the vacuum valve (24), close other pipeline valves, close the vacuum valve (24) when the preset vacuum pressure is reached, cut off the power supply of the vacuum pump, and complete the vacuuming of the standpipe (2) and the air inlet pipe (8); S4: Introduce standard gas The analyzer is turned on for preheating. After the preheating is completed, the standard gas inlet pipe (10) is connected to the standard gas bottle, the standard gas pressure reducing valve (20) and the standard gas inlet valve (22) are opened, and after the preset pressure is reached, the inlet valve (31) and the standard gas inlet valve (22) are closed, and then the first vent valve (23) is opened to discharge the standard gas in the inlet pipe (8), and then the first vent valve (23) is closed, and the nitrogen inlet valve (19) is opened to charge nitrogen of a certain pressure, and then the nitrogen inlet valve (19) is closed, and the first vent valve (23) is opened, and the nitrogen charging and discharging steps are repeated 5 to 10 times; S5: Adjust the seat tube (2) angle and record data Disconnect the connection between the air inlet pipe (8) and the standpipe (2), adjust the setting angle of the standpipe (2) by means of a hand-cranked winch (3), and after adjusting to the desired angle, keep the standpipe (2) still for 3 to 10 minutes, adjust the flow meter (16), and monitor and record the hydrogen concentration data displayed by the first analyzer (13) and the second analyzer (14) in real time; S6: Replacement of standard gas with different hydrogen ratios or pressures Connect the air inlet pipe (8) and the standpipe (2), open the nitrogen inlet valve (19), close the nitrogen inlet valve (19) after a certain pressure of nitrogen is charged, open the first vent valve (23), repeat the nitrogen charging and discharging steps 5 to 10 times, open the inlet valve (31) and the first vent valve (23) after the pressure gauge (29) returns to zero, and repeat steps S2 to S5; S7: Processing after the experiment Connect the air inlet pipe (8) and the standpipe (2), open the nitrogen inlet valve (19), fill with nitrogen of a certain pressure, close the nitrogen inlet valve (19), open the first vent valve (23), and use the nitrogen to discharge the air in the air inlet pipe (8); then open the inlet valve (31) and the nitrogen inlet valve (19), and after filling with nitrogen of a certain pressure, close the nitrogen inlet valve (19), open the first vent valve (23), repeat the nitrogen filling and discharging steps 5 to 10 times, discharge the residual standard gas in the device, close the first vent valve (23), and then turn off the analyzer in turn to end the experiment.

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