An experimental apparatus and method for testing the performance of non-metallic hydrogen delivery pipes

Abstract

The application provides an experimental device and method for testing the performance of a non-metal hydrogen conveying pipeline, and relates to the technical field of hydrogen conveying.The hydrogen is pressurized by a circulating compression unit, enters a second non-metal hydrogen conveying test pipeline, a third non-metal hydrogen conveying test pipeline and a fourth non-metal hydrogen conveying test pipeline, is depressurized by a pressure regulating and metering unit, returns to the circulating pressurization module through a first non-metal hydrogen conveying test pipeline or a hydrogen conveying pipeline provided with a first valve to drive a hydrogen conveying circulation loop, and then the performance of each non-metal hydrogen conveying test pipeline is tested, hydrogen permeation is tested through a hydrogen permeation monitoring unit, and joint hydrogen leakage is tested through a flange joint leakage monitoring unit. Thus, the experimental device formed by the non-metal hydrogen conveying test pipelines realizes hydrogen conveying circulation, and the performance test of the non-metal hydrogen conveying pipeline, the hydrogen permeation test and the joint leakage test are carried out during the hydrogen conveying circulation, so that in-situ measurement simulation is realized.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of hydrogen transportation, in particular to an experimental device for testing the performance of a nonmetallic hydrogen transportation pipeline. BACKGROUND

[0002] In the current hydrogen transportation scheme, nonmetallic pipelines are not practically used for hydrogen transportation and still remain in the stage of theoretical design and laboratory verification. Therefore, it is urgent to simulate actual operation conditions to practically verify the nonmetallic hydrogen transportation pipeline. In related technologies, the traditional metal hydrogen transportation pipeline test platform cannot evaluate the hydrogen permeation, swelling and embrittlement characteristics of the nonmetallic pipeline. There is a lack of multi-parameter integrated testing means, and the testing efficiency is low. There is a lack of dynamic working condition simulation (such as pressure fluctuation, temperature change and mechanical vibration coupling) of hydrogen transportation. The long-term service performance cannot be comprehensively evaluated. SUMMARY

[0003] The application provides an experimental device for testing the performance of a nonmetallic hydrogen transportation pipeline.

[0004] The first aspect of the application provides an experimental device for testing the performance of a nonmetallic hydrogen transportation pipeline, which comprises a circulating compression unit, a pressure regulating and metering unit, a flange joint leakage monitoring unit, a hydrogen permeation monitoring unit, a hydrogen transportation pipeline, a flange, a first nonmetallic hydrogen transportation test pipeline, a second nonmetallic hydrogen transportation test pipeline, a third nonmetallic hydrogen transportation test pipeline and a fourth nonmetallic hydrogen transportation test pipeline.

[0005] Both ends of the first nonmetallic hydrogen transportation test pipeline and the second nonmetallic hydrogen transportation test pipeline are connected to the two hydrogen transportation pipelines through the flanges. The circulating compression unit is arranged on one hydrogen transportation pipeline, and the pressure regulating and metering unit is arranged on the other hydrogen transportation pipeline. One end of the third nonmetallic hydrogen transportation test pipeline and the fourth nonmetallic hydrogen transportation test pipeline is arranged between the output end of the circulating compression unit and the second nonmetallic hydrogen transportation test pipeline, and the other end is arranged between the input end of the pressure regulating and metering unit and the second nonmetallic hydrogen transportation test pipeline, and the two hydrogen transportation pipelines are connected through the flanges. The output end of the pressure regulating and metering unit is also connected to the input end of the circulating compression unit through the hydrogen transportation pipeline on which the first valve is installed, so as to form a hydrogen transportation circulation loop. The flange joint leakage monitoring unit is arranged at the flange interface where each nonmetallic hydrogen transportation test pipeline is connected to the hydrogen transportation pipeline. The hydrogen permeation monitoring unit is arranged on each nonmetallic hydrogen transportation test pipeline.

[0006] After the hydrogen is cyclically pressurized and boosted by the circulating compression unit, the hydrogen enters the second nonmetallic hydrogen transportation test pipeline, the third nonmetallic hydrogen transportation test pipeline and the fourth nonmetallic hydrogen transportation test pipeline, and then is pressure-regulated and pressure-reduced by the pressure regulating and metering unit, and then returns to the circulating pressurization module for circulation through the first nonmetallic hydrogen transportation test pipeline or the hydrogen transportation pipeline on which the valve is installed, so as to drive the hydrogen transportation circulation loop.

[0007] In the case of driving the hydrogen delivery circulation loop, the performance test of each non-metallic hydrogen delivery test pipeline is carried out, and the joint hydrogen leakage test is carried out through the flange joint leakage monitoring unit, and the hydrogen permeation test is carried out through the hydrogen permeation monitoring unit.

[0008] In an embodiment of the present application, the caliber and length of the first non-metallic hydrogen delivery test pipeline and the second non-metallic hydrogen delivery test pipeline are greater than those of the third non-metallic hydrogen delivery test pipeline and the fourth non-metallic hydrogen delivery test pipeline, the pressure in the first non-metallic hydrogen delivery test pipeline is less than that in the second non-metallic hydrogen delivery test pipeline, the third non-metallic hydrogen delivery test pipeline, and the fourth non-metallic hydrogen delivery test pipeline, and the caliber of the third non-metallic hydrogen delivery test pipeline is different from that of the fourth non-metallic hydrogen delivery test pipeline.

[0009] In an embodiment of the present application, the experimental device further comprises a hydrogen injection unit arranged before the input end of the circulation compression unit as a test gas source, for providing hydrogen gas for the circulation compression unit.

[0010] In an embodiment of the present application, the experimental device further comprises a venting pipe for discharging hydrogen gas in the hydrogen delivery circulation loop after completing the experiment for testing the performance of the non-metallic hydrogen delivery pipeline, or purging nitrogen when carrying out the air tightness test of the hydrogen delivery circulation loop.

[0011] In an embodiment of the present application, the experimental device further comprises a plurality of sets of pressure controllers and temperature controllers, and each set of pressure controllers and temperature controllers is arranged at both ends of the first non-metallic hydrogen delivery test pipeline and the second non-metallic hydrogen delivery test pipeline, for collecting and regulating the pressure and temperature of hydrogen gas in the hydrogen delivery circulation loop.

[0012] In an embodiment of the present application, the experimental device further communicates with a remote monitoring system, for real-time acquisition of the collected pressure and temperature of hydrogen gas in the hydrogen delivery circulation loop, so as to determine the flow state of hydrogen gas in each non-metallic hydrogen delivery test pipeline based on the pressure and temperature of hydrogen gas in the hydrogen delivery circulation loop.

[0013] In an embodiment of the present application, when the performance test of each non-metallic hydrogen delivery test pipeline is carried out, a preset threshold axial strain is applied to simulate the synergistic effect of pipeline bending laying and pressure fluctuation, and then the axial and longitudinal change rates of each non-metallic hydrogen delivery test pipeline are measured by each set of pressure controllers and temperature controllers when the hydrogen delivery circulation loop is in the hydrogen delivery state with the change of temperature and pressure.

[0014] In an embodiment of the present application, in the case of joint hydrogen leakage test by the flange joint leakage monitoring unit, the first sealing box is sealed at the flange interface where the non-metallic hydrogen conveying test pipe is connected to the hydrogen conveying pipe, and is pumped to a preset first vacuum threshold, and then the hydrogen leakage amount of the first sealing box is measured by the helium mass spectrometer, and the hydrogen leakage amount is calculated.

[0015] In an embodiment of the present application, in the case of hydrogen permeation test by the hydrogen permeation monitoring unit, a section of the non-metallic hydrogen conveying test pipe is selected for the second sealing box sealing, and is pumped to a preset second vacuum threshold, and then the hydrogen conveying cycle loop is used to convey hydrogen for a preset time period, and then the output valve of the second sealing box is connected to the gas chromatograph to test the hydrogen concentration and calculate the hydrogen permeation rate.

[0016] In an embodiment of the present application, after the performance test, joint hydrogen leakage test and hydrogen permeation test of the non-metallic hydrogen conveying test pipes are completed, the non-metallic hydrogen conveying test pipes are disassembled and tested and analyzed to obtain a test analysis table of the non-metallic hydrogen conveying test pipes, which includes the mechanical property loss data, structural damage data and hydrogen compatibility data of the non-metallic hydrogen conveying test pipes.

[0017] In an embodiment of the present application, small sample test pieces of the non-metallic hydrogen conveying test pipes are placed in the third non-metallic hydrogen conveying test pipe and the fourth non-metallic hydrogen conveying test pipe, and after the performance test, joint hydrogen leakage test and hydrogen permeation test of the non-metallic hydrogen conveying test pipes are completed, hydrogen compatibility analysis is performed on the small sample test pieces of the non-metallic hydrogen conveying test pipes to obtain the hydrogen compatibility of the non-metallic hydrogen conveying test pipes.

[0018] In an embodiment of the present application, a second valve is further installed on the hydrogen conveying pipe between the pressure regulating and metering unit and the first non-metallic hydrogen conveying test pipe, and the first valve and the second valve are independently operated to control the hydrogen gas after pressure regulation and pressure reduction by the pressure regulating and metering unit, and in the case of no performance test of the first non-metallic hydrogen conveying test pipe, the second valve is closed and the first valve is opened.

[0019] The second aspect embodiment of the present application provides an experimental method for testing the performance of a non-metallic hydrogen conveying pipe, which comprises:

[0020] After the hydrogen gas is cyclically pressurized and boosted by the cycle compression unit, the hydrogen gas with a first pressure value after cyclic pressurization and boosting is conveyed to the second non-metallic hydrogen conveying test pipe, the third non-metallic hydrogen conveying test pipe and the fourth non-metallic hydrogen conveying test pipe, and then is pressure-regulated and pressure-reduced by the pressure regulating and metering unit to obtain hydrogen gas with a second pressure value, wherein the first pressure value is greater than the second pressure value.

[0021] In the case of circulating the hydrogen gas of the second pressure value through the first non-metal hydrogen delivery test pipeline back to the circulating pressurization module to drive the hydrogen delivery circulation loop, the performance test of the two hydrogen delivery pipelines and each non-metal hydrogen delivery test pipeline is carried out, and the joint hydrogen leakage test is carried out through the flange joint leakage monitoring unit, and the hydrogen permeation test is carried out through the hydrogen permeation monitoring unit;

[0022] In the case of circulating the hydrogen gas of the second pressure value through the hydrogen delivery pipeline with the first valve installed back to the circulating pressurization module to drive the hydrogen delivery circulation loop, the performance test of the two hydrogen delivery pipelines, the hydrogen delivery pipeline with the first valve installed, and the second, third, and fourth non-metal hydrogen delivery test pipelines is carried out, and the joint hydrogen leakage test is carried out through the flange joint leakage monitoring unit, and the hydrogen permeation test is carried out through the hydrogen permeation monitoring unit.

[0023] The present application provides an experimental device and method for testing the performance of non-metal hydrogen delivery pipelines. The experimental device includes a circulating compression unit, a pressure regulating and metering unit, a flange joint leakage monitoring unit, a hydrogen permeation monitoring unit, a hydrogen delivery pipeline, a flange, a first non-metal hydrogen delivery test pipeline, a second non-metal hydrogen delivery test pipeline, a third non-metal hydrogen delivery test pipeline, and a fourth non-metal hydrogen delivery test pipeline. After the hydrogen gas is pressurized by the circulating compression unit and enters the second, third, and fourth non-metal hydrogen delivery test pipelines, it is then depressurized by the pressure regulating and metering unit, circulated back to the circulating pressurization module through the first non-metal hydrogen delivery test pipeline or the hydrogen delivery pipeline with the first valve installed to drive the hydrogen delivery circulation loop, and then the performance of each non-metal hydrogen delivery test pipeline is tested, the hydrogen permeation test is carried out through the hydrogen permeation monitoring unit, and the joint hydrogen leakage test is carried out through the flange joint leakage monitoring unit. Thus, the experimental device composed of non-metal hydrogen delivery test pipelines realizes hydrogen delivery circulation, non-metal hydrogen delivery pipeline performance testing, hydrogen permeation detection, and joint leakage monitoring during the hydrogen delivery circulation process, and in-situ measurement simulation is achieved.

[0024] The other effects of the above-mentioned optional mode will be described in combination with specific embodiments below. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 A structural schematic diagram of an experimental device for testing the performance of non-metal hydrogen delivery pipelines provided by the embodiments of the present application;

[0026] Figure 2 An operating schematic diagram of a helium mass spectrometer provided by the embodiments of the present application;

[0027] Figure 3 A flowchart of an experimental method for testing the performance of non-metal hydrogen delivery pipelines provided by the embodiments of the present application. DETAILED DESCRIPTION

[0028] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the same or like component have the same or similar designations. The embodiments described below are exemplary and intended to be illustrative of the application and are not intended to limit the scope of the application.

[0029] An experimental device for testing the performance of non-metallic hydrogen pipelines according to an embodiment of the present application is described below with reference to the attached drawing figures.

[0030] Figure 1 is a structural schematic diagram of an experimental device for testing the performance of non-metallic hydrogen pipelines according to an embodiment of the present application.

[0031] As shown in Figure 1 , the experimental device for testing the performance of non-metallic hydrogen pipelines comprises a circulating compression unit 11, a pressure regulating and metering unit 12, a flange joint leakage monitoring unit 13, a hydrogen permeation monitoring unit 14, a hydrogen pipeline 15, a flange 16, a first non-metallic hydrogen pipeline 17, a second non-metallic hydrogen pipeline 18, a third non-metallic hydrogen pipeline 19, and a fourth non-metallic hydrogen pipeline 20, wherein:

[0032] The two ends of the first non-metal hydrogen conveying test pipeline 17 and the second non-metal hydrogen conveying test pipeline 18 are connected with two hydrogen conveying pipelines through flanges 16, the circulating compression unit 11 is arranged on one hydrogen conveying pipeline 15, the pressure regulating and metering unit 12 is arranged on the other hydrogen conveying pipeline 15, one end of the third non-metal hydrogen conveying test pipeline 19 and the fourth non-metal hydrogen conveying test pipeline 20 is arranged between the output end of the circulating compression unit 11 and the second non-metal hydrogen conveying test pipeline 18, the other end is arranged between the input end of the pressure regulating and metering unit 12 and the second non-metal hydrogen conveying test pipeline 18, and the two hydrogen conveying pipelines 15 are connected through the flanges 16, the output end of the pressure regulating and metering unit 12 is also connected with the input end of the circulating compression unit 11 through the hydrogen conveying pipeline 15 on which a first valve is installed, forming a hydrogen conveying circulation loop, the flange joint leakage monitoring unit 13 is arranged at the interface of the flanges 16 at which the non-metal hydrogen conveying test pipelines are connected with the hydrogen conveying pipelines 15, and the hydrogen permeation monitoring unit 14 is arranged on the non-metal hydrogen conveying test pipelines; wherein, after the hydrogen is circulated and pressurized by the circulating compression unit 11, the hydrogen enters the second non-metal hydrogen conveying test pipeline 18, the third non-metal hydrogen conveying test pipeline 19 and the fourth non-metal hydrogen conveying test pipeline 20, and then is pressure-regulated and depressurized by the pressure regulating and metering unit 12, and then returns to the circulating pressurization module for circulation through the first non-metal hydrogen conveying test pipeline 17 or the hydrogen conveying pipeline 15 on which a first valve is installed, so as to drive the hydrogen conveying circulation loop; in the case of driving the hydrogen conveying circulation loop to convey hydrogen, the performance test of the non-metal hydrogen conveying test pipelines is carried out, the joint hydrogen leakage test is carried out through the flange joint leakage monitoring unit 13, and the hydrogen permeation test is carried out through the hydrogen permeation monitoring unit 14.

[0033] Optionally, the first non-metal hydrogen conveying test pipeline 17, the second non-metal hydrogen conveying test pipeline 18, the third non-metal hydrogen conveying test pipeline 19 and the fourth non-metal hydrogen conveying test pipeline 20 can be thermoplastic non-metal composite pipelines. The thermoplastic non-metal composite pipeline has the advantages of high pressure resistance, acid and alkali resistance, microbial erosion resistance, good flexibility and mechanical strength, aging resistance, long service life, low investment cost and the like, and can meet more harsh special environmental conditions. The excellent characteristics can meet various hydrogen conveying scenes, and the thermoplastic non-metal pipeline hydrogen conveying technology has less limitation of region, environment and climate, small laying area, and high reliability and adaptability. The multi-channel parallel test architecture can realize long-distance, high-pressure hydrogen conveying performance pilot-scale circulation operation of the non-metal hydrogen conveying test pipeline, and improve the efficiency.

[0034] Optionally, the hydrogen conveying pipeline 15 can be a metal pipeline, but is not limited thereto.

[0035] Optionally, as shown in Figure 1 The first valve installed on the hydrogen conveying pipeline 15 can include but is not limited to a ball valve.

[0036] In some possible embodiments, the dynamic circulation module mainly uses the compression performance of the compressor to realize the circulation and pressurization of hydrogen; realizes the pressure difference between the two ends of the experimental device, and the hydrogen conveying pipeline 15 has a pressure regulating function, and two ends are provided with detachable non-metal pipeline test ends (the first non-metal hydrogen conveying test pipeline 17 and the second non-metal hydrogen conveying test pipeline 18) of different types, and the hydrogen conveying circulation loop is realized by using the power of the compressor.

[0037] Specifically, the hydrogen compressor outlet pressure design range can be 1-20 MPa, and after the hydrogen is pressurized to the required pressure for the test experiment by the compressor, the circulation is performed, and the experimental device circulation design flow can be 1000-4000 Nm / h. After the hydrogen is pressurized by the circulation pressurization, it enters the second non-metal hydrogen conveying test pipeline 18, the third non-metal hydrogen conveying test pipeline 19, and the fourth non-metal hydrogen conveying test pipeline 20 test section to perform the non-metal pipeline test experiment, and after being regulated by the pressure regulating and metering unit 12, it returns to the circulation pressurization unit for circulation. Pressure fluctuation and flow regulation can be realized in the circulation process.

[0038] In some embodiments, the caliber and length of the first non-metal hydrogen conveying test pipeline 17 and the second non-metal hydrogen conveying test pipeline 18 are greater than those of the third non-metal hydrogen conveying test pipeline 19 and the fourth non-metal hydrogen conveying test pipeline 20, the pressure in the first non-metal hydrogen conveying test pipeline 17 is less than that in the second non-metal hydrogen conveying test pipeline 18, the third non-metal hydrogen conveying test pipeline 19, and the fourth non-metal hydrogen conveying test pipeline 20, and the caliber of the third non-metal hydrogen conveying test pipeline 19 is different from that of the fourth non-metal hydrogen conveying test pipeline 20.

[0039] Among them, the first non-metal hydrogen conveying test pipeline 17 can be a large-caliber, long-distance, low-pressure non-metal pipeline, the second non-metal hydrogen conveying test pipeline 18 can be a large-caliber, long-distance, high-pressure non-metal pipeline, and the third non-metal hydrogen conveying test pipeline 19 and the fourth non-metal hydrogen conveying test pipeline 20 can be different small-caliber, short-distance, high-pressure non-metal pipelines. The same experimental device tests a plurality of different pipe diameters, different pressure non-metal hydrogen conveying test pipelines.

[0040] In some embodiments, as shown in Figure 1 The experimental device further includes a hydrogen injection unit 21, which is arranged before the input end of the circulation compression unit 11 as a test gas source, and is used to provide hydrogen for the circulation compression unit 11.

[0041] Optionally, the hydrogen injection unit 21 can be a hydrogen cylinder group, which is used as a test gas source of the experimental device and can be injected into the circulation compression unit 11 after being pressure-regulated and discharged. Specifically, after being pressure-regulated to 1-10 MPa, the hydrogen enters the compressor of the circulation compression unit 11 to start the circulation pressurization and pressurization mode.

[0042] In some embodiments, as shown in Figure 1As shown, the experimental device also includes a vent pipe 22 for discharging hydrogen in the hydrogen circulation loop after completing the experiment for testing the performance of the non-metallic hydrogen pipeline, or purging nitrogen when conducting the hydrogen circulation loop airtightness test.

[0043] Optionally, after the experimental device is connected to the vent pipe 22, the airtightness test is conducted, and after passing the test, nitrogen is purged, and then the high-pressure hydrogen charging is conducted to realize the stable operation of the hydrogen circulation loop.

[0044] In some embodiments, as shown in Figure 1 As shown, the experimental device also includes multiple sets of pressure controllers 23 (T) and temperature controllers 24 (X), and each set of pressure controllers 23 and temperature controllers 24 is arranged at both ends of the first non-metallic hydrogen pipeline 17 and the second non-metallic hydrogen pipeline 18 for collecting and regulating the pressure and temperature of hydrogen in the hydrogen circulation loop.

[0045] In some possible implementations, the pressure controller 23 (programmable pressure controller) is also used to simulate the pressure fluctuation (0.1 MPa-20 MPa) of hydrogen in the hydrogen circulation loop, and the temperature controller 24 can regulate the temperature of hydrogen in the hydrogen circulation loop to -40℃-80℃, in addition, a humidity controller can be provided to adjust the humidity of hydrogen. Realize the cycle test of different pressure simulation fluctuation.

[0046] In some embodiments, the experimental device also communicates with a remote monitoring system for real-time acquisition of the collected pressure and temperature of hydrogen in the hydrogen circulation loop, so as to determine the flow state of hydrogen in each non-metallic hydrogen pipeline based on the pressure and temperature of hydrogen in the hydrogen circulation loop, and realize remote monitoring and analysis of data by integrating Internet of Things technology, realize real-time automatic acquisition and monitoring of the temperature and pressure of the hydrogen circulation loop, and save labor cost.

[0047] In some embodiments, when the performance test of each non-metallic hydrogen pipeline is conducted, a preset threshold axial strain is applied to simulate the synergistic effect of pipeline bending and pressure fluctuation, and then the axial and longitudinal change rates of each non-metallic hydrogen pipeline are measured by each set of pressure controllers 23 and temperature controllers 24 when the hydrogen circulation loop is in the hydrogen conveying state with the change of temperature and pressure.

[0048] The preset threshold axial strain can be ±5%, but is not limited thereto.

[0049] In some embodiments, in the case of joint hydrogen leakage test by the flange joint leakage monitoring unit 13, the flange interface of each non-metallic hydrogen pipeline connected with the hydrogen pipeline 15 is sealed by the first sealing box, and is extracted to a preset first vacuum threshold, and then the hydrogen leakage amount of the first sealing box corresponding to the output joint leakage is measured by the helium mass spectrometer, and the hydrogen leakage amount is calculated.

[0050] Specifically, as shown in Figure 1 , the first sealing box is sealed at the flange 16 interface where the second non-metallic hydrogen transmission test pipeline 18 is connected with the pressure regulating and metering unit 12 through the hydrogen transmission pipeline 15.

[0051] Among them, the first sealing box adopts a flexible sealing clamp to form a certain volume of sealed space, which can adapt to non-metallic hydrogen transmission test pipelines of different diameters and can realize high-pressure hydrogen environment sealing test at the pressure joint.

[0052] In some possible embodiments, the present application also proposes an operation schematic diagram of a helium mass spectrometer, as shown in Figure 2 , specifically, in the case of the first sealing box as a large sealing container, the sealing detector is arranged outside the large sealing container for detection, the sealing detector is connected to the helium mass spectrometer (helium mass spectrometer leak detector) through a spray gun as the corresponding output joint of the first sealing box, the amount of leaked hydrogen is tested, the hydrogen leakage amount is calculated, and the hydrogen leakage test of the metal gasket (joint) can be realized.

[0053] In some embodiments, when the hydrogen permeation test is performed by the hydrogen permeation monitoring unit, a section of the hydrogen transmission test pipeline is selected for the second sealing box sealing, and is extracted to a preset second vacuum threshold value. After the hydrogen transmission cycle loop transmits hydrogen for a preset time period, the output valve of the second sealing box is connected to the gas chromatograph, the hydrogen concentration is tested, the hydrogen permeation rate is calculated, the in-situ detection method of the hydrogen permeation rate of the non-metallic pipeline is proposed, the test precision is improved to ±0.1%, and the long-term reliability evaluation problem of the non-metallic material in the hydrogen environment is solved.

[0054] Specifically, as shown in Figure 1 , the second sealing box is sealed on the second non-metallic hydrogen transmission test pipeline 18.

[0055] Among them, the second sealing box can also adopt a flexible sealing clamp to form a certain volume of sealed space, which can realize the hydrogen permeation performance test of the non-metallic hydrogen transmission test pipeline.

[0056] In some embodiments, after the performance test, joint hydrogen leakage test, and hydrogen permeation test of each non-metallic hydrogen transmission test pipeline are completed, each non-metallic hydrogen transmission test pipeline is removed and tested and analyzed to obtain a test and analysis table of the non-metallic hydrogen transmission test pipeline. The test and analysis table includes the mechanical property loss data, structural damage data, and hydrogen compatibility data of each non-metallic hydrogen transmission test pipeline. The test of the physical property change in the non-metallic pipeline hydrogen transmission process can be realized.

[0057] In some possible embodiments, as shown in Figure 1As shown, small sample test pieces of each non-metal hydrogen transmission test pipeline are placed in the third non-metal hydrogen transmission test pipeline 19 and the fourth non-metal hydrogen transmission test pipeline 20. After the performance test, the joint hydrogen leakage test, and the hydrogen permeation test of each non-metal hydrogen transmission test pipeline are completed, the hydrogen compatibility of each non-metal hydrogen transmission test pipeline is analyzed by using the small sample test pieces, so as to obtain the hydrogen compatibility of each non-metal hydrogen transmission test pipeline.

[0058] In some possible embodiments, as shown, Figure 1 As shown, a second valve is further installed on the hydrogen transmission pipeline 15 between the pressure regulating and metering unit 12 and the first non-metal hydrogen transmission test pipeline 17. The first valve and the second valve are independently operated and are used to control the hydrogen gas after pressure reduction by the pressure regulating and metering unit 12. When the experiment of the performance of the first non-metal hydrogen transmission test pipeline 17 is not performed, the second valve is closed and the first valve is opened.

[0059] Optionally, as shown, Figure 1 The second valve can include, but is not limited to, a ball valve.

[0060] The application provides an experimental device for testing the performance of a non-metal hydrogen conveying pipeline, which comprises a circulating compression unit, a pressure regulating and metering unit, a flange joint leakage monitoring unit, a hydrogen permeation monitoring unit, a hydrogen conveying pipeline, a flange, a first non-metal hydrogen conveying test pipeline, a second non-metal hydrogen conveying test pipeline, a third non-metal hydrogen conveying test pipeline and a fourth non-metal hydrogen conveying test pipeline, wherein the two ends of the first non-metal hydrogen conveying test pipeline and the second non-metal hydrogen conveying test pipeline are connected to the two hydrogen conveying pipelines through the flange, the circulating compression unit is arranged on one hydrogen conveying pipeline, the pressure regulating and metering unit is arranged on the other hydrogen conveying pipeline, one end of the third non-metal hydrogen conveying test pipeline and the fourth non-metal hydrogen conveying test pipeline is arranged between the output end of the circulating compression unit and the second non-metal hydrogen conveying test pipeline, the other end is arranged between the input end of the pressure regulating and metering unit and the second non-metal hydrogen conveying test pipeline, and the two hydrogen conveying pipelines are communicated through the flange, the output end of the pressure regulating and metering unit is also connected to the input end of the circulating compression unit through the hydrogen conveying pipeline on which a first valve is arranged, so as to form a hydrogen conveying circulation loop, the flange joint leakage monitoring unit is arranged at the flange joint of each non-metal hydrogen conveying test pipeline and the hydrogen conveying pipeline, and the hydrogen permeation monitoring unit is arranged on each non-metal hydrogen conveying test pipeline; after the hydrogen is cyclically pressurized by the circulating compression unit, the hydrogen enters the second non-metal hydrogen conveying test pipeline, the third non-metal hydrogen conveying test pipeline and the fourth non-metal hydrogen conveying test pipeline, and then is depressurized by the pressure regulating and metering unit, and then returns to the circulating pressurization module through the first non-metal hydrogen conveying test pipeline or the hydrogen conveying pipeline on which a valve is arranged, so as to drive the hydrogen conveying circulation loop; in the case that the hydrogen conveying circulation loop is driven to convey hydrogen, the performance of each non-metal hydrogen conveying test pipeline is tested, the joint hydrogen leakage is tested by the flange joint leakage monitoring unit, and the hydrogen permeation is tested by the hydrogen permeation monitoring unit. Thus, the experimental device formed by the non-metal hydrogen conveying test pipelines realizes hydrogen conveying circulation, and the pipeline performance test, hydrogen permeation detection and joint leakage monitoring are carried out in the hydrogen conveying circulation process, so that in-situ measurement simulation is realized.

[0061] In addition, the application further provides an experimental method for testing the performance of a non-metal hydrogen conveying pipeline, which comprises the following steps.

[0062] In step 301, after the hydrogen is cyclically pressurized by the circulating compression unit, the hydrogen with the first pressure value after the cyclic pressurization is conveyed to the second non-metal hydrogen conveying test pipeline, the third non-metal hydrogen conveying test pipeline and the fourth non-metal hydrogen conveying test pipeline, and then is depressurized by the pressure regulating and metering unit, so as to obtain hydrogen with the second pressure value, wherein the first pressure value is greater than the second pressure value.

[0063] Step 302, in the case of circulating the hydrogen gas of the second pressure value through the first non-metallic hydrogen conveying test pipeline to return to the circulating pressurization module to drive the hydrogen conveying circulation loop, the performance test of each non-metallic hydrogen conveying test pipeline is carried out, and the joint hydrogen leakage test is carried out through the flange joint leakage monitoring unit, and the hydrogen permeation test is carried out through the hydrogen permeation monitoring unit.

[0064] Step 303, in the case of circulating the hydrogen gas of the second pressure value through the hydrogen conveying pipeline provided with the first valve to return to the circulating pressurization module to drive the hydrogen conveying circulation loop, the performance test of the second non-metallic hydrogen conveying test pipeline, the third non-metallic hydrogen conveying test pipeline and the fourth non-metallic hydrogen conveying test pipeline is carried out, and the joint hydrogen leakage test is carried out through the flange joint leakage monitoring unit, and the hydrogen permeation test is carried out through the hydrogen permeation monitoring unit.

[0065] The present application provides an experimental method for testing the performance of a non-metallic hydrogen conveying pipeline. After the hydrogen gas is pressurized by the circulating compression unit, the hydrogen gas of the first pressure value is conveyed to the second non-metallic hydrogen conveying test pipeline, the third non-metallic hydrogen conveying test pipeline and the fourth non-metallic hydrogen conveying test pipeline, and then the hydrogen gas of the second pressure value is obtained after the pressure is adjusted by the pressure regulating and metering unit. The first pressure value is greater than the second pressure value. In the case of circulating the hydrogen gas of the second pressure value through the first non-metallic hydrogen conveying test pipeline to return to the circulating pressurization module to drive the hydrogen conveying circulation loop, the performance test of two hydrogen conveying pipelines and each non-metallic hydrogen conveying test pipeline is carried out, and the joint hydrogen leakage test is carried out through the flange joint leakage monitoring unit, and the hydrogen permeation test is carried out through the hydrogen permeation monitoring unit. In the case of circulating the hydrogen gas of the second pressure value through the hydrogen conveying pipeline provided with the first valve to return to the circulating pressurization module to drive the hydrogen conveying circulation loop, the performance test of two hydrogen conveying pipelines, the hydrogen conveying pipeline provided with the first valve and the second non-metallic hydrogen conveying test pipeline, the third non-metallic hydrogen conveying test pipeline and the fourth non-metallic hydrogen conveying test pipeline is carried out, and the joint hydrogen leakage test is carried out through the flange joint leakage monitoring unit, and the hydrogen permeation test is carried out through the hydrogen permeation monitoring unit. Thus, various related hydrogen performance tests of non-metallic hydrogen conveying test pipelines with different diameters and different pressures are realized, which has wide applicability, high safety and can provide key verification technology for market-scale application of non-metallic hydrogen conveying test pipelines.

[0066] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0067] In the description of the specification, the description using the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the particular feature, structure, material or characteristic being described is included in at least one embodiment or example of the present application. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily referred to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, the terms "comprise", "comprising", "include", "including", "contain", "containing" or variations thereof are used inclusively and do not exclude the additional inclusion of unrecited features, structures, materials, or characteristics. In addition, it is understood that where the description indicates that certain features, structures, materials, or characteristics are present in "some" embodiments or examples, it is understood that these features, structures, materials, or characteristics are not necessarily present in all embodiments or examples.

[0068] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary, and are not to be interpreted as limiting the present application, and that the ordinary skilled person in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. An experimental apparatus for testing the performance of non-metallic hydrogen transport pipelines, characterized in that, The experimental setup includes a cyclic compression unit, a pressure regulating and metering unit, a flange joint leakage monitoring unit, a hydrogen permeation monitoring unit, a hydrogen transport pipeline, flanges, a first non-metallic hydrogen transport test pipeline, a second non-metallic hydrogen transport test pipeline, a third non-metallic hydrogen transport test pipeline, and a fourth non-metallic hydrogen transport test pipeline, wherein: Both ends of the first and second non-metallic hydrogen transport test pipes are connected to the two hydrogen transport pipes via flanges. A circulating compression unit is deployed on one hydrogen transport pipe, and a pressure regulating and metering unit is deployed on the other hydrogen transport pipe. One end of the third and fourth non-metallic hydrogen transport test pipes is arranged between the output end of the circulating compression unit and the second non-metallic hydrogen transport test pipe, and the other end is arranged between the input end of the pressure regulating and metering unit and the second non-metallic hydrogen transport test pipe. They are connected to the two hydrogen transport pipes via flanges. The output end of the pressure regulating and metering unit is also connected to the input end of the circulating compression unit via the hydrogen transport pipe with the first valve installed, forming a hydrogen transport circulation loop. A flange joint leakage monitoring unit is deployed at the flange interface connecting each non-metallic hydrogen transport test pipe to the hydrogen transport pipe. A hydrogen permeation monitoring unit is deployed on each non-metallic hydrogen transport test pipe. In this process, after the hydrogen is pressurized by the circulating compression unit, it enters the second, third, and fourth non-metallic hydrogen transport test pipelines. After being pressurized and depressurized by the pressure regulating and metering unit, it returns to the circulating pressurization module through the first non-metallic hydrogen transport test pipeline or the hydrogen transport pipeline with valves installed to drive the hydrogen transport circulation loop. While driving the hydrogen transport circulation loop to transport hydrogen, the performance of each non-metallic hydrogen transport test pipeline is tested, and the hydrogen leakage test of the flange joint is conducted through the flange joint leakage monitoring unit, and the hydrogen permeation test is conducted through the hydrogen permeation monitoring unit. The experimental apparatus also includes multiple sets of pressure controllers and temperature controllers, and a set of pressure controllers and temperature controllers are deployed at both ends of the first non-metallic hydrogen transport test pipe and the second non-metallic hydrogen transport test pipe to collect and regulate the pressure and temperature of hydrogen in the hydrogen transport circulation loop. The pressures of the first non-metallic hydrogen transport test pipe and the second non-metallic hydrogen transport test pipe are different. When conducting performance tests on various non-metallic hydrogen transport test pipelines, an axial strain with a preset threshold is applied to simulate the combined effect of pipeline bending and pressure fluctuation. Then, the axial and longitudinal change rates of each non-metallic hydrogen transport test pipeline are measured by each group of pressure controllers and temperature controllers when the hydrogen transport circulation loop is in hydrogen transport state and the temperature and pressure change. The diameter and length of the first and second non-metallic hydrogen transport test pipes are both greater than those of the third and fourth non-metallic hydrogen transport test pipes. The pressure inside the first non-metallic hydrogen transport test pipe is less than that inside the second, third, and fourth non-metallic hydrogen transport test pipes. The diameter of the third non-metallic hydrogen transport test pipe is different from that of the fourth non-metallic hydrogen transport test pipe.

2. The experimental apparatus for testing the performance of non-metallic hydrogen transport pipelines as described in claim 1, characterized in that, The experimental setup also includes a hydrogen injection unit, which is deployed as a test gas source before the input of the cyclic compression unit to provide hydrogen to the cyclic compression unit.

3. The experimental apparatus for testing the performance of non-metallic hydrogen transport pipelines as described in claim 1, characterized in that, The experimental apparatus also includes a vent pipe for discharging hydrogen from the hydrogen transport loop after completing an experiment to test the performance of the non-metallic hydrogen transport pipeline, or for purging nitrogen during a hydrogen transport loop airtightness test.

4. The experimental apparatus for testing the performance of non-metallic hydrogen transport pipelines as described in claim 1, characterized in that, The experimental apparatus also communicates with a remote monitoring system to acquire the pressure and temperature of hydrogen in the hydrogen transport circulation loop in real time, so as to determine the flow state of hydrogen in each non-metallic hydrogen transport test pipeline based on the pressure and temperature of hydrogen in the hydrogen transport circulation loop.

5. The experimental apparatus for testing the performance of non-metallic hydrogen transport pipelines as described in claim 1, characterized in that, When performing hydrogen leakage testing on the joints using the flange joint leakage monitoring unit, the flange interface connecting each non-metallic hydrogen transport test pipe to the hydrogen transport pipe is sealed with a first sealing box and evacuated to a preset first vacuum threshold. Then, the amount of hydrogen leaked from the corresponding output joint of the first sealing box is measured by a helium mass spectrometer, and the amount of hydrogen leakage is calculated.

6. The experimental apparatus for testing the performance of non-metallic hydrogen transport pipelines as described in claim 1, characterized in that, When conducting hydrogen permeation testing through the hydrogen permeation monitoring unit, a section of the hydrogen transport test pipeline is selected from each non-metallic hydrogen transport test pipeline, sealed in a second sealing box, and evacuated to a preset second vacuum threshold. After a preset time period of hydrogen transport in the hydrogen transport circulation loop, the output valve of the second sealing box is connected to a gas chromatograph to test the hydrogen concentration and calculate the hydrogen permeation rate.

7. The experimental apparatus for testing the performance of non-metallic hydrogen transport pipelines as described in claim 1, characterized in that, After completing the performance tests, joint hydrogen leakage tests, and hydrogen permeation tests of each non-metallic hydrogen transport test pipeline, each non-metallic hydrogen transport test pipeline was dismantled and tested and analyzed to obtain a test analysis table of the non-metallic hydrogen transport test pipeline. The test analysis table includes mechanical performance loss data, structural damage data, and hydrogen compatibility data of each non-metallic hydrogen transport test pipeline.

8. The experimental apparatus for testing the performance of non-metallic hydrogen transport pipelines as described in claim 1, characterized in that, Small sample pieces of each non-metallic hydrogen transport test pipe were placed in the third and fourth non-metallic hydrogen transport test pipes. After the performance test, joint hydrogen leakage test, and hydrogen permeation test of each non-metallic hydrogen transport test pipe were completed, hydrogen compatibility analysis was performed on the small sample pieces of each non-metallic hydrogen transport test pipe to obtain the hydrogen compatibility of each non-metallic hydrogen transport test pipe.

9. The experimental apparatus for testing the performance of non-metallic hydrogen transport pipelines as described in claim 1, characterized in that, A second valve is also installed on the hydrogen transmission pipeline between the pressure regulating and metering unit and the first non-metallic hydrogen transmission test pipeline. The first valve and the second valve operate independently and are both used to control the hydrogen gas after the pressure is reduced by the pressure regulating and metering unit. When the performance of the first non-metallic hydrogen transmission test pipeline is not being tested, the second valve is closed and the first valve is opened.

10. An experimental method for testing the performance of a non-metallic hydrogen transport pipeline, comprising executing the experimental apparatus for testing the performance of a non-metallic hydrogen transport pipeline as described in claim 1, the method comprising: After the hydrogen is pressurized by the circulating compression unit, the hydrogen with the first pressure value obtained by the circulating pressurization is transported to the second non-metallic hydrogen transport test pipeline, the third non-metallic hydrogen transport test pipeline, and the fourth non-metallic hydrogen transport test pipeline. After being pressurized and depressurized by the pressure regulating and metering unit, hydrogen with the second pressure value is obtained. The first pressure value is greater than the second pressure value. With the hydrogen at the second pressure value returned to the circulation booster module through the first non-metallic hydrogen transport test pipeline for circulation to drive the hydrogen transport circulation loop, the performance of each non-metallic hydrogen transport test pipeline is tested, and the joint hydrogen leakage test is conducted through the flange joint leakage monitoring unit and the hydrogen permeation test is conducted through the hydrogen permeation monitoring unit. Hydrogen gas at the second pressure value is returned to the circulation booster module through the hydrogen transmission pipeline equipped with the first valve for circulation. In order to drive the hydrogen transmission circulation loop, the performance of the second non-metallic hydrogen transmission test pipeline, the third non-metallic hydrogen transmission test pipeline, and the fourth non-metallic hydrogen transmission test pipeline are tested. Hydrogen leakage test of the joint is carried out through the flange joint leakage monitoring unit, and hydrogen permeation test is carried out through the hydrogen permeation monitoring unit.

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