A test device for testing hydrogen detonation process under multi-source variable flow

Abstract

The present invention relates to the field of combustible gas explosion safety, and discloses a test device for testing hydrogen detonation processes under multi-source variable flow, which mainly includes: a multi-source flow regulation system, a simulated detonation pipeline system and a data acquisition system. The multi-source flow regulation system includes a hydrogen mixing tank, a shut-off valve, an electric valve and a flow sensor. By changing the opening and closing state of the electric valve, the multi-source variable flow of combustible gas is realized to enter the detonation pipeline, thereby simulating the accident situation of hydrogen multi-source overflow after pipeline failure, and the flow sensor is set after the shut-off valve to obtain the total flow involved in the test; the simulated detonation pipeline system includes a combustion acceleration section and a detonation test section. The combustion acceleration section is equipped with a multi-hole orifice plate to accelerate the flame to form a detonation, and the detonation test section is equipped with an observation window and multiple sensors to obtain multi-source variable flow detonation propagation images and data. The above-mentioned test device is simple to operate and can simulate the hydrogen detonation process after pipeline failure, which is of great significance for engineering applications.

Description

Technical Field

[0001] The invention belongs to the field of combustion and explosion safety of combustible gases, and in particular relates to a test device for testing a hydrogen explosion process under multi-source variable flow conditions. Background Art

[0002] If hydrogen leaks during pipeline transportation, its low density and strong diffusion properties can rapidly mix with air to form a flammable and explosive mixture. This can easily cause an explosion in the presence of an ignition source, posing a serious threat to life and equipment. Pipeline leakage contributes to the combustion and detonation processes from multiple sources, necessitating experimental setups to study and test key parameters such as combustion characteristics, detonation pressure, and flame propagation velocity under variable flow conditions.

[0003] Currently, simulations of hydrogen detonation processes primarily focus on igniting a combustible gas mixture with a fixed source flow rate through spark ignition. Experimental data acquisition systems are then used to record and analyze the detonation data, providing a valuable insight into the underlying mechanisms. However, existing test rigs struggle to simulate the impact of multiple sources of gas on the detonation process under realistic conditions, and they are unable to reflect the propagation behavior of hydrogen detonation processes under pipeline failure. The complexity of multiple sources with variable flow rates makes the detonation process even more difficult to predict. Therefore, there is an urgent need to develop a test rig capable of testing hydrogen detonation processes under multiple sources with variable flow rates. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the present invention proposes a test device for testing the hydrogen detonation process under multi-source variable flow, through which the key parameters of the hydrogen mixture detonation process under controllable flow can be tested.

[0005] The present invention provides a test device for testing the hydrogen detonation process under multi-source variable flow conditions, comprising the following three systems:

[0006] 1. Multi-source flow regulation system;

[0007] 2. Simulate detonation piping system;

[0008] 3. Data acquisition system;

[0009] The present invention aims to provide a test device for testing hydrogen detonation process under multi-source variable flow, so as to solve the shortcomings of the prior art in terms of multi-source operability.

[0010] The present invention is achieved through the following technical solutions:

[0011] The multi-source flow regulation system includes a hydrogen mixing tank (1), stop valves (2), (8), flow sensors (3), (9) and electric valves (4), (5), (6), (7), (10), (11), (12), (13). The hydrogen mixing tank (1) is installed with two main pipes extending to the upper and lower parts of the detonation pipeline, and four branch pipes are installed on each of the two main pipes to enter the detonation pipeline symmetrically in the upper and lower directions; the stop valve (2) and the flow sensor (3) are installed in sequence on the upper main pipe, and the stop valve (8) and the flow sensor (9) are installed in sequence on the lower main pipe. The output of the flow of the hydrogen mixing tank is controlled by the stop valve, and the total flow data during the test is obtained according to the output signal of the flow sensor; the electric valves (4), (5), (6), and (7) are installed on the four branch pipes branched from the upper main pipe, and the electric valves (10), (11), (12), and (13) are installed on the four branch pipes branched from the lower main pipe. By controlling the opening and closing states of the electric valves of the branch pipes, the gas source entering the detonation pipeline is increased or changed, thereby simulating the accident situation of hydrogen overflow from multiple sources after pipeline failure.

[0012] The simulated detonation pipe system includes an adjustable high-voltage igniter (25), an ignition electrode (26), a porous plate (27), an observation window (28), and an exhaust valve (29). The adjustable high-voltage power supply (25) is connected to the ignition electrode (26), and the ignition electrode (26) is inserted into the front end of the detonation pipe. The adjustable high-voltage igniter is first charged to reach a specified voltage, and the igniter discharges to break down the air between the ignition electrodes, generating an electric spark to ignite the gas. The detonation pipe is a square cross-section pipe with a size of 300×300 mm and a wall thickness of 6 mm, and a length of 6 m. The porous plate (27) further forms a detonation by accelerating the combustion flame, and divides the detonation pipe into a combustion acceleration section and a detonation test section. The 1m before the detonation pipe is the acceleration section, and the 5m after the pipe is the test section, which is the place where the detonation wave propagates. The observation window (28) is installed in the detonation test section to observe the flame propagation of the combustible gas detonation process under multi-source variable flow. The exhaust valve (29) is installed at the end of the detonation pipe to discharge the combustion gas after the test is completed, so as to ensure the safety of the test.

[0013] The data acquisition system includes pressure sensors (14), (15), (16), (17), (18), photoelectric sensors (19), (20), (21), (22), (23), an oscilloscope (24) and a computer (30). The pressure sensors and photoelectric sensors are respectively located at the upper and lower parts of the simulated detonation pipeline. A pressure sensor (14) and a photoelectric sensor (19) are respectively provided in the combustion acceleration section. A total of four pressure sensors (15), (16), (17), (18) and four photoelectric sensors (20), (21), (22), (23) are provided in the detonation test section at the porous plate (11) and the rear part of the branch pipe to obtain the pressure, flame and temperature data of the combustible gas detonation process under multi-source variable flow; the oscilloscope (24) is electrically connected to each sensor to display the electronic signal transmitted by each sensor; the computer (30) is connected to the oscilloscope (24) to process the overpressure, temperature and flame propagation speed data of each sensor.

[0014] As a further technical solution, the detonation tube in the simulated detonation piping system of the present invention is made of alloy steel.

[0015] As a further technical solution, the porous orifice plate provided in the simulated detonation piping system of the present invention is a square orifice plate with a size of 300×300 mm, a blockage ratio of 0.560, and a thickness of 10.33 mm.

[0016] As a further technical solution, the observation window provided in the simulated detonation piping system of the present invention is a 200×2000 mm, 20 mm thick, high-temperature and pressure-resistant organic glass.

[0017] As a further technical solution, a high-speed camera is installed opposite the observation window of the present invention to capture images of flame propagation changes under multi-source variable flow and transmit them to a computer.

[0018] Compared with the prior art, the technical solution of the present invention has the following technical effects or advantages:

[0019] The multi-source flow regulation system of the present invention is provided with two outlet main lines in the hydrogen mixing tank, and a shut-off valve and a flow sensor are installed on each of the main lines to control the flow output, obtain flow data to realize variable flow visualization, and realize quantitative research on the simulation of multi-source variable flow detonation process; the two outlet main lines respectively branch out into four branch lines to enter the detonation pipeline, and an electric valve is installed on each of the branch lines. By controlling the opening and closing of the electric valve, the input of multi-source variable flow is realized, which can further simulate the hydrogen detonation behavior in the actual situation on site after pipeline failure.

[0020] The detonation pipeline system of the present invention divides the detonation pipeline into an acceleration section and a test section with a porous plate in the pipeline as a boundary. The porous plate can accelerate the flame to form a detonation wave, thereby improving the test efficiency.

[0021] Advantages of additional aspects of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention.

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0024] Figure 1 The present invention is a structural diagram of a test device for testing the hydrogen detonation process under variable flow.

[0025] In the figure: 1, hydrogen mixing tank; 2, stop valve; 3, flow sensor; 4, 5, 6, 7, electric valve; 8, stop valve; 9, flow sensor; 10, 11, 12, 13, electric valve; 14, 15, 16, 17, 18, pressure sensor; 19, 20, 21, 22, 23, photoelectric sensor; 24, oscilloscope; 25, adjustable high-voltage igniter; 26, ignition electrode; 27, multi-hole plate; 28, observation window; 29, exhaust valve; 30, computer. DETAILED DESCRIPTION

[0026] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0027] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0028] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0029] like Figure 1 As shown, the experimental device for testing the hydrogen detonation process under multi-source variable flow in this embodiment includes a multi-source flow regulation system, a simulated detonation pipeline system and a data acquisition system.

[0030] Before the test, nitrogen was introduced to purge the test device and the sealing of the pipeline was checked to ensure there was no leakage;

[0031] Before the test, open the stop valve (2), stop valve (8), electric valve (4), and electric valve (10), and fill the front end of the detonation pipe with mixed gas until the preset pressure value is reached, and record the filling flow rate;

[0032] The test is started by starting the adjustable high-voltage igniter (25). The ignition electrode (26) generates an electric spark in the acceleration section pipeline to ignite the mixed gas. The flame is accelerated through the porous plate (27) to form a detonation wave that propagates to the test section pipeline. The detonation data of the pressure sensor and the photoelectric sensor are recorded, and the detonation wave propagation image is photographed in the observation window (28). According to the test requirements, by controlling the opening and closing states of the branch pipeline electric valves (4), (5), (6), (7), (10), (11), (12), and (13), the combustible gas intake source is increased or changed to simulate the detonation behavior of hydrogen overflow from multiple sources in the case of pipeline failure. The filling flow and detonation data are recorded and the propagation image of the detonation wave under multi-source variable flow is photographed.

[0033] After the test, the exhaust valve (29) is opened to discharge the test waste gas, and the test is completed.

[0034] Although the above describes the specific embodiments of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without any creative work are still within the scope of protection of the present invention.

Claims

1. A test device for testing hydrogen detonation process under multi-source variable flow, characterized by: The invention comprises a multi-source flow regulating system, a detonation simulation pipeline system and a data acquisition system; the multi-source flow regulating system comprises a hydrogen mixing tank (1), a stop valve 1 (2), a stop valve 2 (8), a flow sensor 1 (3), a flow sensor 2 (9) and electric valves 1 (4), 2 (5), 3 (6), 4 (7), 5 (10), 6 (11), 7 (12), 8 (13); the hydrogen mixing tank (1) is provided with two main pipes extending to the upper and lower parts of the detonation pipeline, and four branch pipes are provided on each of the two main pipes. The flow path enters the detonation pipeline, the stop valve 1 (2) and the flow sensor 1 (3) are sequentially installed on the upper main pipeline, the stop valve 2 (8) and the flow sensor 2 (9) are sequentially installed on the lower main pipeline, the output of the flow of the hydrogen mixing tank (1) is controlled by the stop valves 1 (2) and 2 (8), and the total flow data during the test is obtained according to the output signals of the flow sensors 1 (3) and 2 (9), the electric valves 1 (4), 2 (5), 3 (6), 4 (7) are installed on the four branch pipelines issued by the upper main pipeline, the electric valve 5 (10), 6 (11), 7 (12), 8 (13) are installed in four branch pipes extending from the lower main pipe. By controlling the opening and closing states of the electric valves of the branch pipes, the gas source entering the detonation pipe is increased or changed, thereby simulating the accident situation of hydrogen overflow from multiple sources after the pipe fails. The simulated detonation pipe system includes an adjustable high-voltage igniter (25), an ignition electrode (26), a multi-hole plate (27), an observation window (28), and an exhaust valve (29). The adjustable high-voltage igniter (25) and the ignition electrode (26) are connected to each other. The ignition electrode (26) is connected to the front end of the detonation pipe, and the air between the ignition electrodes is broken down by the discharge of the high-voltage igniter to generate an electric spark to ignite the gas. The porous plate (27) further forms a detonation by accelerating the combustion flame, and the detonation pipe is divided into a combustion acceleration section and a detonation test section. The observation window (28) is installed in the detonation test section to observe the flame propagation of the combustible gas detonation process under multi-source variable flow. The exhaust valve (29) is installed at the end of the detonation pipe to discharge the combustion gas after the test is completed to ensure the safety of the test.The data acquisition system includes pressure sensors 1 (14), 2 (15), 3 (16), 4 (17), 5 (18), photoelectric sensors 1 (19), 2 (20), 3 (21), 4 (22), 5 (23), an oscilloscope (24) and a computer (30). The pressure sensors and photoelectric sensors are respectively located at the upper and lower parts of the simulated detonation pipeline. A pressure sensor 1 (14) and a photoelectric sensor 1 (19) are installed in each combustion acceleration section. Four pressure sensors 2 (15), 3 (16), 4 (17), 5 (18) and four photoelectric sensors 2 (20), 3 (21), 4 (22), 5 (23) are installed at the rear of the porous plate (27) and the branch pipe in the detonation test section to obtain the pressure, flame and temperature data of the combustible gas detonation process under multi-source variable flow. The oscilloscope (24) is connected to each sensor to display the electronic signal transmitted by each sensor. The computer (30) is connected to the oscilloscope (24) to process the data of each sensor.

2. A test device for testing hydrogen detonation process under multi-source variable flow according to claim 1, characterized in that: The test steps include: S10. Before the test, purge the test device with nitrogen and check the tightness of the pipeline to ensure there are no leaks. S20. Before the test, open stop valve 1 (2), stop valve 2 (8), electric valve 1 (4), and electric valve 5 (10), and fill the front end of the detonation pipe with mixed gas until the preset pressure value is reached, and record the filling flow rate; S30. Start the test, start the adjustable high-voltage igniter (25), the ignition electrode (26) generates an electric spark in the acceleration section pipeline to ignite the mixed gas, the flame is accelerated through the porous plate (27) to form a detonation wave that propagates to the test section pipeline, the detonation data of the pressure sensor and the photoelectric sensor are recorded, and the detonation wave propagation image is photographed in the observation window (28); according to the test requirements, by controlling the opening and closing states of the branch pipeline electric valves 1 (4), 2 (5), 3 (6), 4 (7), 5 (10), 6 (11), 7 (12), 8 (13), the combustible gas intake source is increased or changed, the detonation behavior of hydrogen multi-source overflow in the case of pipeline failure is simulated, the filling flow and detonation data are recorded and the detonation wave propagation image under the multi-source flow is photographed; S40. After the test, open the exhaust valve (29) to discharge the test exhaust gas, and the test ends.

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