Experimental device for testing adaptability of high-pressure hydrogen-doped natural gas pipeline flowmeter

Abstract

The invention discloses an experimental device for testing the adaptability of a high-pressure hydrogen-doped natural gas pipeline flowmeter, and relates to the technical field of flowmeter measurement. The whole device comprises a high-pressure nitrogen cylinder, a high-pressure methane gas cylinder, a high-pressure hydrogen gas cylinder, a gas cylinder explosion-proof cabinet, a static mixer, a gas buffer mixing tank, a booster compressor, a heater, a high-pressure gas circulating pump, a standard flow meter, an orifice plate flow meter, an ultrasonic flow meter, a turbine flow meter, a release torch, a vacuum pump, a computer console and an experimental main circulating pipeline. The pipeline and the data line are used for connecting the equipment. Hydrogen-doped natural gas with different pressures and different temperatures can be provided for the experimental device, the pressure and temperature in the experimental process and the reading change of the flow meter can be recorded in real time, then the adaptive change of the flow meter under the hydrogen-doped working condition can be evaluated, and the device has the advantages of being high in safety, good in measurement precision and convenient and fast to operate.

Description

Technical Field

[0001] The invention belongs to the technical field of flow meter measurement, and in particular relates to an experimental device and an experimental method for testing the adaptability of a high-pressure hydrogen-blended natural gas pipeline flow meter. Background Art

[0002] Hydrogen energy is a clean and efficient secondary energy source, offering a key breakthrough in addressing the global energy crisis and environmental pollution, and promoting global energy transformation and upgrading. Hydrogen production in my country is primarily concentrated in central and western my country. However, due to significant regional disparities in economic development, hydrogen cannot be fully consumed locally in these regions. Blending hydrogen into natural gas at a certain ratio and then transporting it to the economically developed eastern coastal regions via natural gas pipelines or networks facilitates large-scale, long-distance hydrogen transportation and subsequent efficient utilization of hydrogen energy. Furthermore, the cost of modifying pipelines or networks is low. Given the current incomplete hydrogen storage and transportation infrastructure and unclear development plans, blending hydrogen into natural gas pipelines is a potentially optimal way to achieve large-scale, long-distance, safe, and efficient transportation of hydrogen produced from abandoned renewable energy.

[0003] Accurate hydrogen metering is a critical component of hydrogen pipeline transportation. Numerous factors influence accurate hydrogen metering, including temperature, pressure, composition, and humidity. However, due to its small molecular weight, wide purity variations, high pressure levels, and variable humidity, hydrogen exhibits significant physical differences from natural gas. This can cause variations in the hydraulic and thermal operating parameters within the transmission pipeline network, becoming a major constraint on accurate hydrogen metering. Furthermore, my country is a vast country with significant topographical differences between the central and western regions and the eastern coastal areas, resulting in large temperature fluctuations. These environmental changes can also significantly impact hydrogen metering accuracy. To investigate the impact of hydrogen blending into natural gas pipelines on the metering performance of various flowmeters, it is necessary to design and construct an experimental setup and method to test the metering performance of various flowmeters under varying hydrogen blending ratios, pressures, and temperatures. This will lay the foundation for further research on the adaptability of flowmeters in hydrogen environments. Summary of the Invention

[0004] The present invention aims to provide an experimental device suitable for testing the adaptability of flowmeters used in high-pressure hydrogen-blended natural gas pipelines, based on the metering principles of various flowmeters and the safety requirements of experimental operations in a hydrogen environment. This device enables experimental research on the adaptability of various flowmeters under varying hydrogen blending ratios, pressures, and temperatures, providing a reliable testing platform. An experimental device for testing the adaptability of a high-pressure hydrogen-blended natural gas pipeline flowmeter comprises a high-pressure nitrogen cylinder (1), a high-pressure methane cylinder (2), a high-pressure hydrogen cylinder (3), a cylinder explosion-proof cabinet (4), a first cylinder pressure regulating valve (5), a second cylinder pressure regulating valve (6), a third cylinder pressure regulating valve (7), a first pressure and temperature sensor (8), a static mixer (9), a first on-off valve (10), a second on-off valve (11), a third on-off valve (12), a gas buffer mixing tank (13), a second pressure and temperature sensor (14), a booster compressor (15), a fourth on-off valve (16), a third pressure and temperature sensor (17), a heater (18), a fifth on-off valve (19), a fourth pressure and temperature sensor (20), a first check valve (21), and a high-pressure gas circulation pump (22). , a sixth switch valve (23), a fifth pressure and temperature sensor (24), a standard flow meter (25), an orifice flow meter (26), an ultrasonic flow meter (27), a turbine flow meter (28), a sixth pressure and temperature sensor (29), a seventh switch valve (30), an eighth switch valve (31), a ninth switch valve (32), a first vent valve (33), a second vent valve (34), a third vent valve (35), a venting torch (36), a seventh pressure and temperature sensor (37), a first safety valve (38), a vacuum pump (39), a computer console (40), an experimental main circulation pipeline (41), an experimental auxiliary pipeline (42), an experimental gas supply pipeline (43), an experimental auxiliary pipeline (44), a vent pipeline (45), and pipelines and data lines connecting the above-mentioned devices.

[0005] The invention is characterized in that the high-pressure nitrogen cylinder (1), the high-pressure methane cylinder (2), the high-pressure hydrogen cylinder (3), the cylinder explosion-proof cabinet (4), the first cylinder pressure regulating valve (5), the second cylinder pressure regulating valve (6), the third cylinder pressure regulating valve (7), and the experimental gas supply pipeline (43) constitute a high-pressure gas supply system for the experimental device; the high-pressure gas supply system provides the experimental device with nitrogen required for purging and airtightness inspection, as well as methane and hydrogen at the specific pressure and temperature required for the experiment.

[0006] The high-pressure methane cylinder (2), the high-pressure hydrogen cylinder (3), the first pressure and temperature sensor (8), and the static mixer (9) constitute a gas mixing system, which can provide the experimental device with mixed natural gas at a specific hydrogen blending ratio.

[0007] The gas boosting system is connected by a boosting compressor (15) and an experimental auxiliary pipeline (42). A third switch valve (12) is provided on the pipeline between the gas buffer mixing tank (13) and the boosting compressor (15). The gas flows from the gas buffer mixing tank (13) through the pipeline and then flows into the experimental auxiliary pipeline (42) and flows to the boosting compressor (15), thereby boosting the mixed gas required for the experiment.

[0008] The gas venting system is used to vent the mixed gas in the device in an emergency or after the experiment. One end of the venting pipeline (45) is connected to a venting torch for igniting and venting the vented gas, and the other end is connected to the gas circulation pipeline and the gas buffer mixing tank (13). A total of three venting valves (33), (34), and (35) are provided. The first venting valve (33) is used to vent the gas in the experimental circulation main pipeline (41), the second venting valve (34) is used to vent the gas in the experimental auxiliary pipeline, and the third venting valve (35) is used to vent the gas in the gas buffer mixing tank. A seventh pressure and temperature sensor (37) is provided on the venting pipeline (45) for monitoring the temperature and pressure during the venting process.

[0009] The vacuum pump (39), the first safety valve (38), the first vent valve (33), the second vent valve (34), the third vent valve (35), the vent pipe (45), and the seventh temperature and pressure sensor (37) constitute a vacuum system of the experimental device, which can remove air from the experimental device and ensure experimental safety.

[0010] The heater (18) is a heating belt that heats the winding of the experimental main body loop in real time. The pipeline temperature can be monitored and controlled in real time on the computer console, and the adaptability experiment of the hydrogen-blended natural gas flow meter can meet the different temperature requirements.

[0011] The data acquisition system comprises a computer console (40) and various temperature and pressure sensors and flow meter sensors connected to the computer console via data cables, so as to record data such as temperature and pressure during the flow meter adaptability experiment of different types of hydrogen-blended natural gas, and transmit the recorded data to realize real-time visualization of the experimental data.

[0012] By adopting the above technical solution, the present invention can achieve the following beneficial effects:

[0013] (1) The pressure and flow of methane and hydrogen can be controlled by controlling the openings of the second gas cylinder pressure regulating valve 6 and the third gas cylinder pressure regulating valve 7. By using compressed methane and hydrogen gas sources with different initial temperatures and mixing them in the static mixer 9, hydrogen-blended natural gas with different temperatures, pressures, and hydrogen blending ratios can be prepared;

[0014] (2) The booster compressor 15, the heater 18, and the high-pressure gas circulation pump 22 can provide the experimental device with flowing hydrogen-blended natural gas at a stable pressure and a certain temperature.

[0015] (3) By installing a standard flow meter and different types of flow meters (mass flow meter, ultrasonic flow meter, turbine flow meter) in series on the main experimental pipeline, the changes in the actual measurement adaptability of different types of flow meters under different hydrogen blending ratios, pressures, temperatures, etc. can be observed;

[0016] (4) The computer console 60 can automatically collect various test data and draw parameter change curves. The operator can directly control the start and stop and power of each device on the computer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings in the specification that constitute part of the present invention are used to provide further understanding of the present invention. The schematic embodiments of the present invention and their description are used to explain the present invention and do not constitute improper limitations on the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without expending creative work.

[0018] Figure 1 This is a structural schematic diagram of an experimental device for testing the adaptability of a high-pressure hydrogen-blended natural gas pipeline flowmeter provided by the present invention.

[0019] In the figure: 1-high-pressure nitrogen cylinder, 2-high-pressure methane cylinder, 3-high-pressure hydrogen cylinder, 4-cylinder explosion-proof cabinet, 5-first cylinder pressure regulating valve, 6-second cylinder pressure regulating valve, 7-third cylinder pressure regulating valve, 8-first pressure and temperature sensor, 9-static mixer, 10-first switch valve, 11-second switch valve, 12-third switch valve, 13-gas buffer mixing tank, 14-second pressure and temperature sensor 15-boosting compressor, 16-fourth switch valve, 17-third pressure and temperature sensor, 18-heater, 19-fifth switch valve, 20-fourth pressure and temperature sensor, 21-first check valve, 22-high-pressure gas circulation pump, 23- The sixth switch valve, 24-the fifth pressure and temperature sensor, 25-the standard flow meter, 26-the orifice flow meter, 27-the ultrasonic flow meter, 28-the turbine flow meter, 29-the sixth pressure and temperature sensor, 30-the seventh switch valve, 31-the eighth switch valve, 32-the ninth switch valve, 33-the first vent valve, 34-the second vent valve, 35-the third vent valve, 36-the vent torch, 37-the seventh pressure and temperature sensor, 38-the first safety valve, 39-the vacuum pump, 40-the computer console, 41-the experimental main circulation pipeline, 42-the experimental auxiliary pipeline, 43-the experimental gas supply pipeline, 44-the experimental auxiliary pipeline, 45-the vent pipeline.

[0020] Figure 2The operating steps required to conduct experiments using the device described in the present invention. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described below with reference to the accompanying drawings, but the present invention is not limited to the following embodiments.

[0022] The specific implementation is as follows:

[0023] Step 1: Assemble the experimental device, close all valves, and check whether all equipment is intact. Turn on the computer console 40 and record the experimental data in the pipeline in real time. Before the experiment begins, the ventilation of the experimental site needs to meet the experimental requirements.

[0024] Step 2: Before the experiment begins, the experimental device needs to be pressure-tested to ensure that there are no leaks in any part of the experimental device. Open the first gas cylinder pressure regulating valve 5, the second switch valve 11, the fifth switch valve 19, the first check valve 21, the sixth switch valve 23, the seventh switch valve 30, the eighth switch valve 31, and the ninth switch valve 32. Release the high-pressure nitrogen in the high-pressure nitrogen cylinder 1 and flow through the booster compressor 15. Pressurize the main part of the experimental device to 6MPa and maintain it for 1 hour to achieve the pressure test.

[0025] Step 3: After the pressure test of the experimental device is completed, in order to ensure the safety of the test process, it is necessary to remove the air in the test box and pipelines. Therefore, it is necessary to purge and vacuum the experimental pipelines. Keep the second gas cylinder pressure regulating valve 6, the third gas cylinder pressure regulating valve 7, and the first safety valve 38 in front of the vacuum pump 39 in a closed state. Open all the remaining valves of the experimental device to ensure that all the remaining pipelines in the experimental device are unobstructed. The purge gas comes from the high-pressure nitrogen cylinder 1, the gas channel booster compressor 15, and the gas circulation pump 22 for pressurization circulation. Purge the experimental device and pipelines for 5 minutes. When all the pipelines in the experimental device are purged, open the vent valve 35 above the gas buffer mixing tank, the vent valve 33 above the experimental main circulation pipeline 41, the vent valve 34, and the first safety valve 38 in front of the circulation pump. Then close all the remaining valves of the experimental device, turn on the vacuum pump, and start vacuuming. When the pressure gauge on the vacuum pump approaches 0 and remains stable, the purge is completed and the vacuum pump and all valves are closed.

[0026] Step 4: Open the second gas cylinder pressure regulating valve 6 and the third gas cylinder pressure regulating valve 7, control the valve opening to produce the required ratio of hydrogen-blended natural gas for the experiment, and after temporarily storing it in the static mixer 9, open the first on-off valve 10 to pass the prepared high-pressure hydrogen-blended natural gas into the gas buffer mixing tank 13 for storage.

[0027] Step 5: Open the third on-off valve 12, and the hydrogen-blended natural gas is pressurized by the booster compressor to maintain the pipeline gas at 6 MPa. Then, open the fourth on-off valve 16, the fifth on-off valve 19, the first check valve 21, the sixth on-off valve 23, the seventh on-off valve 30, the eighth on-off valve 31, and the ninth on-off valve 32 to allow the hydrogen-blended natural gas to enter the experimental main circulation pipeline. Simultaneously, turn on the heater 18 to maintain the hydrogen-blended natural gas at 20°C. Turn on the high-pressure gas circulation pump 22. After the temperature and pressure of the experimental main circulation pipeline stabilize, close the fifth on-off valve 19, and the hydrogen-blended natural gas passes through the standard flowmeter 25, the orifice flowmeter 26, the ultrasonic flowmeter 27, and the turbine flowmeter 28 in sequence. The experiment lasts for 8 hours, and the temperature and pressure changes of the main experimental circulation pipeline are monitored by the fifth pressure and temperature sensor 24 and the sixth pressure and temperature sensor 29. After the test, the adaptability of the hydrogen-blended natural gas flowmeter is analyzed by comparing the measured values ​​of the three flowmeters under test with the standard flowmeter.

[0028] Step 6: After the experiment, the experimental gas in the device needs to be vented. Open the fifth on-off valve 19, vent valve 33, vent valve 34, and vent valve 35, allowing the hydrogen-blended natural gas in the entire experimental device to enter the vent torch 36 for ignition and venting. Step 7: To ensure safety, after the experiment, purge the experimental device with high-pressure nitrogen. After 3 minutes of purging, close all valves to complete one round of experiment.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An experimental device for testing the adaptability of a high-pressure hydrogen-blended natural gas pipeline flowmeter, comprising a high-pressure nitrogen cylinder (1), a high-pressure methane cylinder (2), a high-pressure hydrogen cylinder (3), a cylinder explosion-proof cabinet (4), a first cylinder pressure regulating valve (5), a second cylinder pressure regulating valve (6), a third cylinder pressure regulating valve (7), a first pressure and temperature sensor (8), a static mixer (9), a first on-off valve (10), a second on-off valve (11), a third on-off valve (12), a gas buffer mixing tank (13), a second pressure and temperature sensor (14), a booster compressor (15), a fourth on-off valve (16), a third pressure and temperature sensor (17), a heater (18), a fifth on-off valve (19), a fourth pressure and temperature sensor (20), a first check valve (21), a high-pressure gas circulation pump (22 ), a sixth on-off valve (23), a fifth pressure-temperature sensor (24), a standard flowmeter (25), an orifice flowmeter (26), an ultrasonic flowmeter (27), a turbine flowmeter (28), a sixth pressure-temperature sensor (29), a seventh on-off valve (30), an eighth on-off valve (31), a ninth on-off valve (32), a first vent valve (33), a second vent valve (34), a third vent valve (35), a venting torch (36), a seventh pressure-temperature sensor (37), a first safety valve (38), a vacuum pump (39), a computer console (40), an experimental main circulation pipeline (41), an experimental auxiliary pipeline (42), an experimental gas supply pipeline (43), an experimental auxiliary pipeline (44), a vent pipeline (45), and pipelines and data lines connecting the above-mentioned devices. It is characterized by The high-pressure nitrogen cylinder (1), the high-pressure methane cylinder (2), the high-pressure hydrogen cylinder (3), the cylinder explosion-proof cabinet (4), the first cylinder pressure regulating valve (5), the second cylinder pressure regulating valve (6), the third cylinder pressure regulating valve (7), and the experimental gas supply pipeline (43) constitute a high-pressure gas supply system for the experimental device; the high-pressure gas supply system provides the experimental device with nitrogen required for purging and airtightness inspection, as well as methane and hydrogen at the specific pressure and temperature required for the experiment. The high-pressure methane cylinder (2), the high-pressure hydrogen cylinder (3), the first pressure and temperature sensor (8), and the static mixer (9) constitute a gas mixing system, which can provide the experimental device with mixed natural gas at a specific hydrogen blending ratio. The gas boosting system is connected by a boosting compressor (15) and an experimental auxiliary pipeline (42). A third switch valve (12) is provided on the pipeline between the gas buffer mixing tank (13) and the boosting compressor (15). The gas flows from the gas buffer mixing tank (13) through the pipeline and then flows into the experimental auxiliary pipeline (42) and flows to the boosting compressor (15), thereby boosting the mixed gas required for the experiment. The gas venting system is used to vent the mixed gas in the device in an emergency or after the experiment. One end of the venting pipeline (45) is connected to a venting torch for igniting and venting the vented gas, and the other end is connected to the gas circulation pipeline and the gas buffer mixing tank (13). A total of three venting valves (33), (34), and (35) are provided. The first venting valve (33) is used to vent the gas in the experimental circulation main pipeline (41), the second venting valve (34) is used to vent the gas in the experimental auxiliary pipeline, and the third venting valve (35) is used to vent the gas in the gas buffer mixing tank. A seventh pressure and temperature sensor (37) is provided on the venting pipeline (45) for monitoring the temperature and pressure during the venting process. The vacuum pump (39), the first safety valve (38), the first vent valve (33), the second vent valve (34), the third vent valve (35), the vent pipe (45), and the seventh temperature and pressure sensor (37) constitute a vacuum system of the experimental device, which can remove air from the experimental device and ensure experimental safety. The heater (18) is a heating belt that heats the winding of the experimental main body loop in real time. The pipeline temperature can be monitored and controlled in real time on the computer console, and the adaptability experiment of the hydrogen-blended natural gas flow meter can meet the different temperature requirements. The data acquisition system comprises a computer console (40) and various temperature and pressure sensors and flow meter sensors connected to the computer console via data cables, so as to record data such as temperature and pressure during the flow meter adaptability experiment of different types of hydrogen-blended natural gas, and transmit the recorded data to realize real-time visualization of the experimental data.

2. The experimental device for testing the adaptability of a high-pressure hydrogen-blended natural gas pipeline flowmeter according to claim 1, characterized in that: The pressure and flow rates of methane and hydrogen can be controlled by varying the closing degrees of the second and third gas cylinder pressure regulating valves 6 and 7. By using compressed methane and hydrogen sources with different initial temperatures and mixing them in the static mixer 9, hydrogen-blended natural gas with varying temperatures, pressures, and hydrogen blending ratios can be produced.

3. The experimental device for testing the adaptability of a high-pressure hydrogen-blended natural gas pipeline flowmeter according to claim 1, characterized in that: The booster compressor 15 , the heater 18 , and the high-pressure gas circulation pump 22 can provide the experimental device with flowing hydrogen-blended natural gas at a stable pressure and a certain temperature.

4. The experimental device for testing the adaptability of a high-pressure hydrogen-blended natural gas pipeline flowmeter according to claim 1, characterized in that: By installing a standard flow meter and different types of flow meters (mass flow meter, ultrasonic flow meter, turbine flow meter) in series on the main experimental pipeline, the changes in the actual measurement adaptability of different types of flow meters under different hydrogen blending ratios, pressures, temperatures and other conditions can be observed.

5. The experimental device for testing the adaptability of a high-pressure hydrogen-blended natural gas pipeline flowmeter according to claim 1, characterized in that: The computer console 60 can automatically collect various test data and draw parameter change curves, and the operator can directly control the start and stop and power of each device on the computer.

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