Experimental device and method for testing performance of nonmetal hydrogen conveying pipeline

Abstract

The invention 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, in the experimental device, hydrogen enters a second non-metal hydrogen conveying testing pipeline, a third non-metal hydrogen conveying testing pipeline and a fourth non-metal hydrogen conveying testing pipeline after being cyclically pressurized and boosted through a cyclic compression unit; after the pressure is regulated and reduced by the pressure regulating and metering unit, the hydrogen is returned to the circulating and pressurizing module through the first non-metal hydrogen conveying test pipeline or the hydrogen conveying pipeline provided with the first valve to be circulated so as to drive the hydrogen conveying circulating loop, then the performance test of each non-metal hydrogen conveying test pipeline is carried out, and the hydrogen permeation test is carried out through the hydrogen permeation monitoring unit; and a joint hydrogen leakage test is carried out through the flange joint leakage monitoring unit. Therefore, hydrogen transportation circulation is realized through the experimental device constructed by the nonmetal hydrogen transportation test pipeline, and performance test, hydrogen permeation detection and joint leakage monitoring of the nonmetal hydrogen transportation pipeline are carried out in the hydrogen transportation circulation process, so that in-situ measurement simulation is realized.

Description

Technical Field

[0001] The present application relates to the technical field of hydrogen transportation, and in particular to an experimental device for testing the performance of a non-metallic hydrogen transmission pipeline. Background Art

[0002] In the current hydrogen transportation scheme, non-metallic pipelines for hydrogen transportation have not been put into practical use and are still in the stage of theoretical design and laboratory verification. Therefore, it is urgent to simulate the actual operating conditions to verify the non-metallic hydrogen pipelines. In the relevant technologies, the traditional metal hydrogen pipeline test platform cannot evaluate the hydrogen permeation, swelling, embrittlement and other characteristics of non-metallic pipelines. There is a lack of multi-parameter integrated testing methods, and the test efficiency is low. There is a lack of dynamic working condition simulation of hydrogen transportation (such as pressure fluctuations, temperature changes, and mechanical vibration coupling). It is impossible to comprehensively evaluate the long-term service performance. Summary of the invention

[0003] The present application proposes an experimental device for testing the performance of a non-metallic hydrogen transmission pipeline.

[0004] The first embodiment of the present application proposes an experimental device for testing the performance of a non-metallic hydrogen transmission pipeline, the experimental device comprising a circulation compression unit, a pressure regulating and metering unit, a flange joint leakage monitoring unit, a hydrogen permeation monitoring unit, a hydrogen transmission pipeline, a flange, a first non-metallic hydrogen transmission test pipeline, a second non-metallic hydrogen transmission test pipeline, a third non-metallic hydrogen transmission test pipeline, and a fourth non-metallic hydrogen transmission test pipeline, wherein: Both ends of the first non-metallic hydrogen transmission test pipeline and the second non-metallic hydrogen transmission test pipeline are connected to the two hydrogen transmission pipelines through flanges, a circulation compression unit is deployed on one hydrogen transmission pipeline, and a pressure regulating and metering unit is deployed on another hydrogen transmission pipeline. One end of the third non-metallic hydrogen transmission test pipeline and the fourth non-metallic hydrogen transmission test pipeline is arranged between the output end of the circulation compression unit and the second non-metallic hydrogen transmission test pipeline, and the other end is arranged between the input end of the pressure regulating and metering unit and the second non-metallic hydrogen transmission test pipeline, and the two hydrogen transmission pipelines are connected through flanges. The output end of the pressure regulating and metering unit is also connected to the input end of the circulation compression unit through the hydrogen transmission pipeline installed with the first valve, so as to form a hydrogen transmission circulation loop. The flange joint leakage monitoring unit is deployed at the flange interface where each non-metallic hydrogen transmission test pipeline is connected to the hydrogen transmission pipeline, and the hydrogen permeation monitoring unit is deployed on each non-metallic hydrogen transmission test pipeline; Among them, after the hydrogen is circulated and pressurized by the circulation compression unit, it enters 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, and then after the pressure is regulated and reduced by the pressure regulating and metering unit, it returns to the circulation boosting module through the first non-metallic hydrogen transmission test pipeline or the hydrogen transmission pipeline installed with a valve for circulation, so as to drive the hydrogen transmission circulation loop; When the hydrogen transport circulation loop is driven to transport hydrogen, the performance test of each non-metallic hydrogen transport 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.

[0005] In one embodiment of the present application, the caliber and length of the first non-metallic hydrogen transmission test pipeline and the second non-metallic hydrogen transmission test pipeline are greater than those of the third non-metallic hydrogen transmission test pipeline and the fourth non-metallic hydrogen transmission test pipeline, the pressure in the first non-metallic hydrogen transmission test pipeline is less than that 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, and the caliber of the third non-metallic hydrogen transmission test pipeline is different from that of the fourth non-metallic hydrogen transmission test pipeline.

[0006] In one embodiment of the present application, the experimental device further includes a hydrogen injection unit, which is deployed as a test gas source before the input end of the circulation compression unit to provide hydrogen to the circulation compression unit.

[0007] In one embodiment of the present application, the experimental device also includes a vent pipe for discharging hydrogen in the hydrogen transmission circulation loop after completing the experiment for testing the performance of the non-metallic hydrogen transmission pipeline, or for purging nitrogen when conducting an air tightness test of the hydrogen transmission circulation loop.

[0008] In one embodiment of the present application, the experimental device also includes multiple groups of pressure controllers and temperature controllers, and a group of pressure controllers and temperature controllers are deployed at both ends of the first non-metallic hydrogen transmission test pipeline and the second non-metallic hydrogen transmission test pipeline to collect and control the pressure and temperature of hydrogen in the hydrogen transmission circulation loop.

[0009] In one embodiment of the present application, the experimental device also communicates with a remote monitoring system to obtain the collected pressure and temperature of the hydrogen in the hydrogen transmission circulation loop in real time, so as to determine the flow state of hydrogen in each non-metallic hydrogen transmission test pipeline based on the pressure and temperature of the hydrogen in the hydrogen transmission circulation loop.

[0010] In one embodiment of the present application, when performing performance tests on each non-metallic hydrogen transmission test pipeline, an axial strain of a preset threshold is applied to simulate the synergistic effect of pipeline bending and laying and pressure fluctuations, and then each set of pressure controllers and temperature controllers are used to measure the axial and longitudinal change rates of each non-metallic hydrogen transmission test pipeline when the hydrogen transmission circulation loop is in a hydrogen transmission state as the temperature and pressure change.

[0011] In one embodiment of the present application, when performing a joint hydrogen leakage test through a flange joint leakage monitoring unit, a first sealing box is sealed at the flange interface where each non-metallic hydrogen transmission test pipeline is connected to the hydrogen transmission pipeline, and the vacuum is evacuated to a preset first vacuum threshold, and then the amount of hydrogen leaked from the output joint corresponding to the first sealing box is measured by a helium mass spectrometer to calculate the hydrogen leakage amount.

[0012] In one embodiment of the present application, when a hydrogen permeation test is performed using a hydrogen permeation monitoring unit, a section of the hydrogen transmission test pipeline is selected from each non-metallic hydrogen transmission test pipeline to seal a second sealed box, and the vacuum is evacuated to a preset second vacuum threshold. After the hydrogen transmission loop is re-transmitted for a preset time period, the output valve of the second sealed box is connected to a gas chromatograph to test the hydrogen concentration and calculate the hydrogen permeability.

[0013] In one embodiment of the present application, after completing the performance test, joint hydrogen leakage test, and hydrogen permeation test of each non-metallic hydrogen transmission test pipeline, each non-metallic hydrogen transmission test pipeline is dismantled and tested and analyzed to obtain a test analysis table of the non-metallic hydrogen transmission test pipeline, wherein the test analysis table includes mechanical property loss data, structural damage data, and hydrogen compatibility data of each non-metallic hydrogen transmission test pipeline.

[0014] In one embodiment of the present application, small sample test pieces of each non-metallic hydrogen transmission test pipe are placed in the third non-metallic hydrogen transmission test pipe and the fourth non-metallic hydrogen transmission test pipe. After completing the performance test, joint hydrogen leakage test, and hydrogen permeation test of each non-metallic hydrogen transmission test pipe, a hydrogen compatibility analysis is performed on the small sample test pieces of each non-metallic hydrogen transmission test pipe to obtain the hydrogen compatibility of each non-metallic hydrogen transmission test pipe.

[0015] In one embodiment of the present application, a second valve is also installed on the hydrogen pipeline between the pressure regulating and metering unit and the first non-metallic hydrogen transmission test pipeline, and the first valve and the second valve operate independently of each other and are both used to control the hydrogen after the pressure is regulated and reduced by the pressure regulating and metering unit, wherein, when the performance experiment of the first non-metallic hydrogen transmission test pipeline is not carried out, the second valve is closed and the first valve is opened.

[0016] The second embodiment of the present application proposes an experimental method for testing the performance of a non-metallic hydrogen transmission pipeline, the method comprising: After the hydrogen is circulated and pressurized by the circulation compression unit, the hydrogen having a first pressure value after the circulated pressurization is transported to 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, and then the pressure is regulated and reduced by the pressure regulating and metering unit to obtain the hydrogen having a second pressure value, wherein the first pressure value is greater than the second pressure value; When the hydrogen with the second pressure value is returned to the circulation boosting module through the first non-metallic hydrogen transmission test pipeline for circulation to drive the hydrogen transmission circulation loop, the performance tests of the two hydrogen transmission pipelines and each non-metallic hydrogen transmission test pipeline are performed, and the joint hydrogen leakage test is performed through the flange joint leakage monitoring unit, and the hydrogen permeation test is performed through the hydrogen permeation monitoring unit; The hydrogen with the second pressure value is returned to the circulation boosting module through the hydrogen pipeline installed with the first valve for circulation. When driving the hydrogen circulation loop, performance tests are performed on the two hydrogen pipelines, the hydrogen pipeline installed with the first valve and the second non-metallic hydrogen test pipeline, the third non-metallic hydrogen test pipeline, and the fourth non-metallic hydrogen test pipeline. A joint hydrogen leakage test is performed through the flange joint leakage monitoring unit, and a hydrogen permeation test is performed through the hydrogen permeation monitoring unit.

[0017] The present application proposes an experimental device and method for testing the performance of a non-metallic hydrogen transmission pipeline. The experimental device includes a circulation compression unit, a pressure regulating and metering unit, a flange joint leakage monitoring unit, a hydrogen permeation monitoring unit, a hydrogen transmission pipeline, a flange, a first non-metallic hydrogen transmission test pipeline, a second non-metallic hydrogen transmission test pipeline, a third non-metallic hydrogen transmission test pipeline, and a fourth non-metallic hydrogen transmission test pipeline. After the hydrogen is circulated and pressurized by the circulation compression unit, it enters 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. After the pressure is regulated and reduced by the pressure regulating and metering unit, it returns to the circulation boosting module through the first non-metallic hydrogen transmission test pipeline or the hydrogen transmission pipeline installed with the first valve for circulation to drive the hydrogen transmission circulation loop, and then the performance test of each non-metallic hydrogen transmission test pipeline is performed, the hydrogen permeation test is performed by the hydrogen permeation monitoring unit, and the joint hydrogen leakage test is performed by the flange joint leakage monitoring unit. Thus, the experimental device formed by the non-metallic hydrogen transmission test pipeline realizes the hydrogen transmission cycle, and the non-metallic hydrogen transmission pipeline performance test, hydrogen permeation detection, and joint leakage monitoring are carried out during the hydrogen transmission cycle to realize the in-situ measurement simulation.

[0018] Other effects of the above optional manner will be described below in conjunction with specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of an experimental device for testing the performance of a non-metallic hydrogen transmission pipeline provided in an embodiment of the present application; Figure 2 A schematic diagram of the operation of a helium mass spectrometer provided in an embodiment of the present application; Figure 3 A schematic flow chart of an experimental method for testing the performance of a non-metallic hydrogen pipeline provided in an embodiment of the present application. DETAILED DESCRIPTION

[0020] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0021] The following describes an experimental device for testing the performance of a non-metallic hydrogen transmission pipeline according to an embodiment of the present application with reference to the accompanying drawings.

[0022] Figure 1 It is a structural schematic diagram of an experimental device for testing the performance of a non-metallic hydrogen transmission pipeline according to an embodiment of the present application.

[0023] like Figure 1 As shown, the experimental device for testing the performance of non-metallic hydrogen transmission pipelines includes a circulation 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 transmission pipeline 15, a flange 16, a first non-metallic hydrogen transmission test pipeline 17, a second non-metallic hydrogen transmission test pipeline 18, a third non-metallic hydrogen transmission test pipeline 19, and a fourth non-metallic hydrogen transmission test pipeline 20, wherein: Both ends of the first non-metallic hydrogen transmission test pipeline 17 and the second non-metallic hydrogen transmission test pipeline 18 are connected to the two hydrogen transmission pipelines through flanges 16, the circulation compression unit 11 is deployed on one hydrogen transmission pipeline 15, and the pressure regulating and metering unit 12 is deployed on another hydrogen transmission pipeline 15. One end of the third non-metallic hydrogen transmission test pipeline 19 and the fourth non-metallic hydrogen transmission test pipeline 20 is arranged between the output end of the circulation compression unit 11 and the second non-metallic hydrogen transmission test pipeline 18, and the other end is arranged between the input end of the pressure regulating and metering unit 12 and the second non-metallic hydrogen transmission test pipeline 18, and the two hydrogen transmission pipelines 15 are connected through flanges 16. The output end of the pressure regulating and metering unit 12 is also connected to the input end of the circulation compression unit 11 through the hydrogen transmission pipeline 15 installed with the first valve, forming a hydrogen transmission circulation loop, and the flange joint leakage monitoring unit 13 The hydrogen permeation monitoring unit 14 is deployed on each non-metallic hydrogen transmission test pipeline at the flange 16 interface where each non-metallic hydrogen transmission test pipeline is connected to the hydrogen transmission pipeline 15; wherein, after the hydrogen is circulated and pressurized by the circulation compression unit 11, it enters the second non-metallic hydrogen transmission test pipeline 18, the third non-metallic hydrogen transmission test pipeline 19, and the fourth non-metallic hydrogen transmission test pipeline 20, and then after the pressure is regulated and reduced by the pressure regulating and metering unit 12, it returns to the circulation boosting module through the first non-metallic hydrogen transmission test pipeline 17 or the hydrogen transmission pipeline 15 installed with the first valve for circulation to drive the hydrogen transmission circulation loop; when the hydrogen transmission circulation loop is driven to transport hydrogen, the performance test of each non-metallic hydrogen transmission test pipeline is carried out, and 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.

[0024] Optionally, the first non-metallic hydrogen transmission test pipeline 17, the second non-metallic hydrogen transmission test pipeline 18, the third non-metallic hydrogen transmission test pipeline 19, and the fourth non-metallic hydrogen transmission test pipeline 20 can be thermoplastic non-metallic composite pipelines. Thermoplastic non-metallic composite pipelines have many advantages such as resistance to high pressure, acid and alkali, resistance to microbial erosion, good flexibility and mechanical strength, aging resistance, long service life, low investment cost, etc., and can meet more demanding special environmental conditions. Its excellent characteristics can meet a variety of hydrogen transportation scenarios. Thermoplastic non-metallic pipeline hydrogen transmission technology is less restricted by geography, environment and climate, and has a small laying area and has strong reliability and adaptability. Designing a multi-channel parallel testing architecture can realize the long-distance and high-pressure hydrogen transmission performance pilot-scale circulation operation of non-metallic hydrogen transmission test pipelines and improve efficiency.

[0025] Optionally, the hydrogen transmission pipeline 15 may be a metal pipeline, but is not limited thereto.

[0026] Alternatively, if Figure 1 As shown, the first valve installed on the hydrogen transmission pipeline 15 may include but is not limited to a ball valve.

[0027] In some possible implementations, the dynamic circulation module mainly utilizes the compression performance of the compressor to realize the circulation and pressurization of hydrogen; to achieve a pressure difference at both ends of the experimental device, the hydrogen pipeline 15 has a pressure regulating function, and different types of detachable non-metallic pipeline test ends (a first non-metallic hydrogen test pipeline 17 and a second non-metallic hydrogen test pipeline 18) are installed at both ends to realize the hydrogen circulation loop by utilizing the power of the compressor.

[0028] Specifically, the design range of the outlet pressure of the hydrogen compressor can be 1-20MPa. After the hydrogen is pressurized by the compressor to the pressure required for the test, it is circulated. The design flow rate of the experimental device can be 1000-4000Nm / h. After the hydrogen is pressurized by the circulation, it enters the second non-metallic hydrogen transmission test pipeline 18, the third non-metallic hydrogen transmission test pipeline 19, and the fourth non-metallic hydrogen transmission test pipeline 20 test section for non-metallic pipeline testing. After the pressure is adjusted by the pressure regulating and metering unit 12, it returns to the circulation and pressurization unit for circulation. Pressure fluctuation and flow regulation can be achieved during the circulation process.

[0029] In some embodiments, the caliber and length of the first non-metallic hydrogen transmission test pipeline 17 and the second non-metallic hydrogen transmission test pipeline 18 are greater than those of the third non-metallic hydrogen transmission test pipeline 19 and the fourth non-metallic hydrogen transmission test pipeline 20, the pressure in the first non-metallic hydrogen transmission test pipeline 17 is less than that in the second non-metallic hydrogen transmission test pipeline 18, the third non-metallic hydrogen transmission test pipeline 19, and the fourth non-metallic hydrogen transmission test pipeline 20, and the caliber of the third non-metallic hydrogen transmission test pipeline 19 is different from that of the fourth non-metallic hydrogen transmission test pipeline 20.

[0030] Among them, the first non-metallic hydrogen transmission test pipeline 17 can be a large-caliber, long-distance, low-pressure non-metallic pipeline, the second non-metallic hydrogen transmission test pipeline 18 can be a large-caliber, long-distance, high-pressure non-metallic pipeline, and the third non-metallic hydrogen transmission test pipeline 19 and the fourth non-metallic hydrogen transmission test pipeline 20 can be different small-caliber, short-distance, high-pressure non-metallic pipelines. The same experimental device can test a variety of non-metallic hydrogen transmission test pipelines with different diameters and pressures.

[0031] In some embodiments, Figure 1 As shown, the experimental device also includes a hydrogen injection unit 21, which is deployed before the input end of the circulation compression unit 11 as a test gas source to provide hydrogen to the circulation compression unit 11.

[0032] Optionally, the hydrogen injection unit 21 can be a hydrogen cylinder group, which, as the test gas source of the experimental device, can be injected into the circulation compression unit 11 after pressure regulation and gas discharge. Specifically, after the pressure is adjusted to 1-10 MPa, it enters the compressor of the circulation compression unit 11 and starts the circulation boosting mode.

[0033] In some embodiments, Figure 1 As shown, the experimental device also includes a vent pipe 22, which is used to discharge the hydrogen in the hydrogen transmission circulation loop after completing the experiment for testing the performance of the non-metallic hydrogen transmission pipeline, or to purge nitrogen when conducting a gas tightness test of the hydrogen transmission circulation loop.

[0034] Optionally, after the experimental device is connected to the vent pipe 22, an air tightness test is carried out, and after passing the test, nitrogen purging is carried out, and then high-pressure hydrogen filling is carried out to achieve stable operation of the hydrogen transmission circulation loop.

[0035] In some embodiments, Figure 1 As shown, the experimental device also includes multiple groups of pressure controllers 23 (T) and temperature controllers 24 (X), and a group of pressure controllers 23 and temperature controllers 24 are deployed at both ends of the first non-metallic hydrogen transmission test pipeline 17 and the second non-metallic hydrogen transmission test pipeline 18, respectively, for collecting and regulating the pressure and temperature of hydrogen in the hydrogen transmission circulation loop.

[0036] In some possible implementations, the pressure controller 23 (programmable pressure controller) is also used to simulate the pressure fluctuation (0.1MPa-20MPa) of hydrogen in the hydrogen transmission circulation loop, and the temperature controller 24 can adjust the temperature of hydrogen in the hydrogen transmission circulation loop to -40℃-80℃. In addition, a humidity controller can be set to adjust the humidity of hydrogen, so as to realize the cycle test of different pressure simulation fluctuations.

[0037] In some embodiments, the experimental device also communicates with the remote monitoring system to obtain the collected pressure and temperature of the hydrogen in the hydrogen transmission circulation loop in real time, so as to determine the flow state of hydrogen in each non-metallic hydrogen transmission test pipeline based on the pressure and temperature of the hydrogen in the hydrogen transmission circulation loop, integrate the Internet of Things technology, realize remote monitoring and analysis of data, and realize real-time automatic collection and monitoring of the temperature and pressure of the hydrogen transmission circulation loop, saving labor costs.

[0038] In some embodiments, when performing performance tests on each non-metallic hydrogen transmission test pipeline, an axial strain of a preset threshold is applied to simulate the synergistic effect of pipeline bending and laying and pressure fluctuations, and then each set of pressure controllers 23 and temperature controllers 24 are used to measure the axial and longitudinal change rates of each non-metallic hydrogen transmission test pipeline when the hydrogen transmission circulation loop is in a hydrogen transmission state as the temperature and pressure change.

[0039] The preset threshold axial strain may be ±5%, but is not limited thereto.

[0040] In some embodiments, when performing a joint hydrogen leakage test through the flange joint leakage monitoring unit 13, the flange interface where each non-metallic hydrogen transmission test pipeline is connected to the hydrogen transmission pipeline 15 is sealed with a first sealed box and evacuated to a preset first vacuum threshold. The amount of hydrogen leaked from the output joint corresponding to the first sealed box is then measured by a helium mass spectrometer to calculate the hydrogen leakage amount.

[0041] Specifically, Figure 1 As shown, the first sealing box is sealed at the flange 16 interface where the second non-metallic hydrogen transmission test pipeline 18 is connected to the pressure regulating and metering unit 12 through the hydrogen transmission pipeline 15 .

[0042] Among them, the first sealing box adopts a flexible sealing clamp to form a sealed space of a certain volume, which is suitable for non-metallic hydrogen transmission test pipelines of different diameters and can realize high-pressure hydrogen environment sealing testing at the crimping joints.

[0043] In some possible implementations, the present application also proposes a schematic diagram of the operation of a helium mass spectrometer, such as Figure 2 As shown, specifically, in the case where the first sealed box is used as a large sealed container, a sealing detector is arranged on the outside of the large sealed container for detection. The sealing detector is connected to a helium mass spectrometer (helium mass spectrometer leak detector) through a spray gun as the corresponding output connector of the first sealed box to test the amount of leaked hydrogen and calculate the hydrogen leakage amount, thereby realizing a hydrogen leakage test of a metal gasket (joint).

[0044] In some embodiments, when a hydrogen permeation test is performed through a hydrogen permeation monitoring unit, a section of the hydrogen transmission test pipeline is selected from each non-metallic hydrogen transmission test pipeline to be sealed with a second sealed box, and the vacuum is evacuated to a preset second vacuum threshold. After the hydrogen transmission loop is re-transmitted for a preset time period, the output valve of the second sealed box is connected to a gas chromatograph to test the hydrogen concentration and calculate the hydrogen permeability. An in-situ detection method for the hydrogen permeability of non-metallic pipelines is proposed, and the test accuracy is improved to ±0.1%, thereby solving the problem of long-term reliability assessment of non-metallic materials in a hydrogen environment.

[0045] Specifically, Figure 1 As shown, the second sealing box is sealed on the second non-metallic hydrogen transmission test pipe 18.

[0046] The second sealing box may also adopt a flexible sealing fixture to form a sealed space of a certain volume, so as to realize the hydrogen permeability performance test of the non-metallic hydrogen transmission test pipeline.

[0047] In some embodiments, after completing the performance test, joint hydrogen leakage test, and hydrogen permeation test of each non-metallic hydrogen transmission test pipeline, each non-metallic hydrogen transmission test pipeline is dismantled and tested and analyzed to obtain a test analysis table of the non-metallic hydrogen transmission test pipeline, which includes mechanical property loss data, structural damage data, and hydrogen compatibility data of each non-metallic hydrogen transmission test pipeline. The test of physical property changes during hydrogen transmission of non-metallic pipelines can be realized.

[0048] In some possible implementations, such as Figure 1 As shown, small sample specimens of each non-metallic hydrogen transmission test pipeline are placed in the third non-metallic hydrogen transmission test pipeline 19 and the fourth non-metallic hydrogen transmission test pipeline 20. After completing the performance test, joint hydrogen leakage test and hydrogen permeation test of each non-metallic hydrogen transmission test pipeline, hydrogen compatibility analysis is performed on the small sample specimens of each non-metallic hydrogen transmission test pipeline to obtain the hydrogen compatibility of each non-metallic hydrogen transmission test pipeline.

[0049] In some possible implementations, such as Figure 1 As shown, a second valve is also installed on the hydrogen pipeline 15 between the pressure regulating and metering unit 12 and the first non-metallic hydrogen transmission test pipeline 17. The first valve and the second valve operate independently of each other and are both used to control the hydrogen after the pressure is regulated and reduced by the pressure regulating and metering unit 12. When the performance experiment of the first non-metallic hydrogen transmission test pipeline 17 is not carried out, the second valve is closed and the first valve is opened.

[0050] Alternatively, if Figure 1 As shown, the second valve may include, but is not limited to, a ball valve.

[0051] The present application proposes an experimental device for testing the performance of a non-metallic hydrogen transmission pipeline, the experimental device includes a circulation compression unit, a pressure regulating and metering unit, a flange joint leakage monitoring unit, a hydrogen permeation monitoring unit, a hydrogen transmission pipeline, a flange, a first non-metallic hydrogen transmission test pipeline, a second non-metallic hydrogen transmission test pipeline, a third non-metallic hydrogen transmission test pipeline, and a fourth non-metallic hydrogen transmission test pipeline, wherein: both ends of the first non-metallic hydrogen transmission test pipeline and the second non-metallic hydrogen transmission test pipeline are connected to the two hydrogen transmission pipelines through flanges, the circulation compression unit is deployed on one hydrogen transmission pipeline, the pressure regulating and metering unit is deployed on the other hydrogen transmission pipeline, one end of the third non-metallic hydrogen transmission test pipeline and the fourth non-metallic hydrogen transmission test pipeline is arranged between the output end of the circulation compression unit and the second non-metallic hydrogen transmission test pipeline, and the other end is arranged between the input end of the pressure regulating and metering unit and the second non-metallic hydrogen transmission test pipeline, and the two hydrogen transmission pipelines are connected through flanges, and the pressure regulating and metering unit is arranged between the input end of the pressure regulating and metering unit and the second non-metallic hydrogen transmission test pipeline. The output end of the metering unit is also connected to the input end of the circulation compression unit through the hydrogen pipeline installed with the first valve to form a hydrogen circulation loop. The flange joint leakage monitoring unit is deployed at the flange interface where each non-metallic hydrogen test pipeline is connected to the hydrogen pipeline, and the hydrogen permeation monitoring unit is deployed on each non-metallic hydrogen test pipeline; wherein, after the hydrogen is circulated and pressurized by the circulation compression unit, it enters the second non-metallic hydrogen test pipeline, the third non-metallic hydrogen test pipeline, and the fourth non-metallic hydrogen test pipeline, and then after the pressure is regulated and reduced by the pressure regulating and metering unit, it returns to the circulation boosting module through the first non-metallic hydrogen test pipeline or the hydrogen pipeline installed with the valve for circulation to drive the hydrogen circulation loop; when the hydrogen circulation loop is driven to transport hydrogen, the performance test of each non-metallic hydrogen 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, the hydrogen circulation is realized through the experimental device formed by the non-metallic hydrogen test pipeline, and the pipe body performance test, hydrogen permeation detection, and joint leakage monitoring are carried out during the hydrogen circulation process, realizing the in-situ measurement simulation.

[0052] In addition, the present application also proposes an experimental method for testing the performance of a non-metallic hydrogen transmission pipeline, the method comprising: Step 301, after the hydrogen is circulated and pressurized by the circulation compression unit, the hydrogen with a first pressure value after the circulation and pressurization is transported to 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, and then the pressure is regulated and reduced by the pressure regulating and metering unit to obtain hydrogen with a second pressure value, wherein the first pressure value is greater than the second pressure value.

[0053] Step 302, when the hydrogen with the second pressure value is returned to the circulation boosting module through the first non-metallic hydrogen transmission test pipeline for circulation to drive the hydrogen transmission circulation loop, the performance test of each non-metallic hydrogen transmission test pipeline is performed, and the joint hydrogen leakage test is performed through the flange joint leakage monitoring unit, and the hydrogen permeation test is performed through the hydrogen permeation monitoring unit.

[0054] Step 303, returning the hydrogen of the second pressure value to the circulation boosting module through the hydrogen transmission pipeline installed with the first valve for circulation, and driving the hydrogen transmission circulation loop, performing performance tests on 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, and performing joint hydrogen leakage test through the flange joint leakage monitoring unit and hydrogen permeation test through the hydrogen permeation monitoring unit.

[0055] The present application proposes an experimental method for testing the performance of a non-metallic hydrogen transmission pipeline. After the hydrogen is circulated and pressurized by a circulation compression unit, the hydrogen with a first pressure value after the circulation and pressurization is transported to a second non-metallic hydrogen transmission test pipeline, a third non-metallic hydrogen transmission test pipeline, and a fourth non-metallic hydrogen transmission test pipeline, and then the pressure is regulated and reduced by a pressure regulating and metering unit to obtain hydrogen with a second pressure value, wherein the first pressure value is greater than the second pressure value; when the hydrogen with the second pressure value is returned to the circulation and pressurization module through the first non-metallic hydrogen transmission test pipeline for circulation to drive the hydrogen transmission circulation loop, the two hydrogen transmission pipelines and each non-metallic hydrogen transmission test pipeline are operated. It is a performance test of the hydrogen transmission test pipeline, 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; the hydrogen of the second pressure value is returned to the circulation boosting module through the hydrogen transmission pipeline installed with the first valve for circulation, so as to drive the hydrogen transmission circulation loop, and the performance tests of the two hydrogen transmission pipelines, the hydrogen transmission pipeline installed with the first valve and 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 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 this way, various related hydrogen performance tests of non-metallic hydrogen transmission test pipelines with different pipe diameters and different pressures are realized, which has wide applicability and high safety, and can provide key verification technology for the market-scale application of non-metallic hydrogen transmission test pipelines.

[0056] In addition, the terms "first" and "second" are used for descriptive purposes only and should not 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" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0057] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0058] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An experimental device for testing the performance of non-metallic hydrogen pipelines, characterized in that: The experimental device includes a circulation compression unit, a pressure regulating and metering unit, a flange joint leakage monitoring unit, a hydrogen permeation monitoring unit, a hydrogen transmission pipeline, a flange, a first non-metallic hydrogen transmission test pipeline, a second non-metallic hydrogen transmission test pipeline, a third non-metallic hydrogen transmission test pipeline, and a fourth non-metallic hydrogen transmission test pipeline, wherein: Both ends of the first non-metallic hydrogen transmission test pipeline and the second non-metallic hydrogen transmission test pipeline are connected to the two hydrogen transmission pipelines through flanges, a circulation compression unit is deployed on one hydrogen transmission pipeline, and a pressure regulating and metering unit is deployed on another hydrogen transmission pipeline. One end of the third non-metallic hydrogen transmission test pipeline and the fourth non-metallic hydrogen transmission test pipeline is arranged between the output end of the circulation compression unit and the second non-metallic hydrogen transmission test pipeline, and the other end is arranged between the input end of the pressure regulating and metering unit and the second non-metallic hydrogen transmission test pipeline, and the two hydrogen transmission pipelines are connected through flanges. The output end of the pressure regulating and metering unit is also connected to the input end of the circulation compression unit through the hydrogen transmission pipeline installed with the first valve, so as to form a hydrogen transmission circulation loop. The flange joint leakage monitoring unit is deployed at the flange interface where each non-metallic hydrogen transmission test pipeline is connected to the hydrogen transmission pipeline, and the hydrogen permeation monitoring unit is deployed on each non-metallic hydrogen transmission test pipeline; Among them, after the hydrogen is circulated and pressurized by the circulation compression unit, it enters 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, and then after the pressure is regulated and reduced by the pressure regulating and metering unit, it returns to the circulation boosting module through the first non-metallic hydrogen transmission test pipeline or the hydrogen transmission pipeline installed with a valve for circulation, so as to drive the hydrogen transmission circulation loop; When the hydrogen transport circulation loop is driven to transport hydrogen, the performance test of each non-metallic hydrogen transport 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.

2. The experimental device for testing the performance of non-metallic hydrogen pipelines according to claim 1, characterized in that: The caliber and length of the first non-metallic hydrogen transmission test pipeline and the second non-metallic hydrogen transmission test pipeline are both larger than those of the third non-metallic hydrogen transmission test pipeline and the fourth non-metallic hydrogen transmission test pipeline. The pressure in the first non-metallic hydrogen transmission test pipeline is smaller than that in the second, third and fourth non-metallic hydrogen transmission test pipelines. The caliber of the third non-metallic hydrogen transmission test pipeline is different from that of the fourth non-metallic hydrogen transmission test pipeline.

3. The experimental device for testing the performance of non-metallic hydrogen pipelines according to claim 1, characterized in that: The experimental device also includes a hydrogen injection unit, which is deployed as a test gas source before the input end of the circulation compression unit to provide hydrogen to the circulation compression unit.

4. The experimental device for testing the performance of non-metallic hydrogen pipelines according to claim 1, characterized in that: The experimental device also includes a vent pipe for discharging hydrogen in the hydrogen transmission circulation loop after completing the experiment for testing the performance of the non-metallic hydrogen transmission pipeline, or for purging nitrogen when conducting an air tightness test of the hydrogen transmission circulation loop.

5. The experimental device for testing the performance of non-metallic hydrogen pipelines according to claim 1, characterized in that: The experimental device also includes multiple groups of pressure controllers and temperature controllers, and a group of pressure controllers and temperature controllers are deployed at both ends of the first non-metallic hydrogen transmission test pipeline and the second non-metallic hydrogen transmission test pipeline to collect and control the pressure and temperature of hydrogen in the hydrogen transmission circulation loop.

6. The experimental device for testing the performance of non-metallic hydrogen pipelines according to claim 5, characterized in that: The experimental device also communicates with the remote monitoring system to obtain the collected pressure and temperature of the hydrogen in the hydrogen transmission circulation loop in real time, so as to determine the flow state of hydrogen in each non-metallic hydrogen transmission test pipeline based on the pressure and temperature of the hydrogen in the hydrogen transmission circulation loop.

7. The experimental device for testing the performance of non-metallic hydrogen pipelines according to claim 5, characterized in that: When conducting performance tests on each non-metallic hydrogen transmission test pipeline, an axial strain of a preset threshold is applied to simulate the synergistic effect of pipeline bending and pressure fluctuation. Then, each set of pressure controllers and temperature controllers are used to measure the axial and longitudinal change rates of each non-metallic hydrogen transmission test pipeline when the temperature and pressure of the hydrogen transmission circulation loop change in the hydrogen transmission state.

8. The experimental device for testing the performance of non-metallic hydrogen pipelines according to claim 1, characterized in that: When the flange joint leakage monitoring unit is used to perform a joint hydrogen leakage test, the flange interface where each non-metallic hydrogen transmission test pipeline is connected to the hydrogen transmission pipeline is sealed with a first sealing box and evacuated to a preset first vacuum threshold. The amount of hydrogen leaked from the output joint corresponding to the first sealing box is then measured by a helium mass spectrometer to calculate the hydrogen leakage amount.

9. The experimental device for testing the performance of non-metallic hydrogen pipelines according to claim 1, characterized in that: When the hydrogen permeation test is performed through the hydrogen permeation monitoring unit, a section of the hydrogen transmission test pipeline is selected from each non-metallic hydrogen transmission test pipeline to seal the second sealing box, and the vacuum is evacuated to a preset second vacuum threshold. After the hydrogen transmission cycle is used to transmit hydrogen for a preset time period, the output valve of the second sealing box is connected to the gas chromatograph to test the hydrogen concentration and calculate the hydrogen permeability.

10. The experimental device for testing the performance of non-metallic hydrogen pipelines according to claim 1, characterized in that: After completing the performance test, joint hydrogen leakage test, and hydrogen permeation test of each non-metallic hydrogen transmission test pipeline, each non-metallic hydrogen transmission test pipeline is dismantled and tested and analyzed to obtain a test analysis table for the non-metallic hydrogen transmission test pipeline, which includes mechanical property loss data, structural damage data, and hydrogen compatibility data of each non-metallic hydrogen transmission test pipeline.

11. The experimental device for testing the performance of non-metallic hydrogen pipelines according to claim 1, characterized in that: Small sample test pieces of each non-metallic hydrogen transmission test pipeline are placed in the third non-metallic hydrogen transmission test pipeline and the fourth non-metallic hydrogen transmission test pipeline. After completing the performance test, joint hydrogen leakage test and hydrogen permeation test of each non-metallic hydrogen transmission test pipeline, a hydrogen compatibility analysis is performed on the small sample test pieces of each non-metallic hydrogen transmission test pipeline to obtain the hydrogen compatibility of each non-metallic hydrogen transmission test pipeline.

12. The experimental device for testing the performance of non-metallic hydrogen pipelines according to claim 1, characterized in that: A second valve is also installed on the hydrogen 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 of each other and are both used to control the hydrogen after the pressure is regulated and reduced by the pressure regulating and metering unit. When the performance experiment of the first non-metallic hydrogen transmission test pipeline is not carried out, the second valve is closed and the first valve is opened.

13. An experimental method for testing the performance of a non-metallic hydrogen pipeline using the experimental device for testing the performance of a non-metallic hydrogen pipeline as claimed in claim 1, the method comprising: After the hydrogen is circulated and pressurized by the circulation compression unit, the hydrogen having a first pressure value after the circulated pressurization is transported to 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, and then the pressure is regulated and reduced by the pressure regulating and metering unit to obtain the hydrogen having a second pressure value, wherein the first pressure value is greater than the second pressure value; When the hydrogen with the second pressure value is returned to the circulation boosting module through the first non-metallic hydrogen transmission test pipeline for circulation to drive the hydrogen transmission circulation loop, the performance test of each non-metallic hydrogen transmission test pipeline is performed, and the joint hydrogen leakage test is performed through the flange joint leakage monitoring unit, and the hydrogen permeation test is performed through the hydrogen permeation monitoring unit; The hydrogen with the second pressure value is returned to the circulation boosting module through the hydrogen pipeline installed with the first valve for circulation. When driving the hydrogen circulation loop, the performance tests 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 performed, and the joint hydrogen leakage test is performed through the flange joint leakage monitoring unit, and the hydrogen permeation test is performed through the hydrogen permeation monitoring unit.

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