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

Abstract

The invention relates to the field of burning and explosion safety of combustible gas, and discloses a test device for testing a hydrogen detonation process under multi-source variable flow, which mainly comprises a multi-source flow adjusting system, a detonation simulation pipeline system and a data acquisition system. The multi-source flow adjusting system comprises a hydrogen mixing tank, a stop valve, an electric valve and a flow sensor, and the combustible gas can enter the detonation pipeline in a multi-source variable-flow mode by changing the opening and closing state of the electric valve, so that the accident condition of hydrogen multi-source overflow after the pipeline fails is simulated, and the reliability of the detonation pipeline is improved. A flow sensor is arranged behind the stop valve to obtain the total flow participating in the test; the detonation simulation pipeline system comprises a combustion acceleration section and a detonation test section, the combustion acceleration section is provided with a porous pore plate to accelerate flames to form detonation, and the detonation test section is provided with an observation window and a plurality of sensors to obtain multi-source variable-flow detonation propagation images and data. The test device is simple to operate, can simulate the hydrogen detonation process after the pipeline fails, and is of great significance to engineering application.

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. Background Art

[0002] Once hydrogen fails and leaks during pipeline transportation, it will quickly mix with air to form a flammable and explosive mixed gas due to its low density and strong diffusion properties. In the presence of an ignition source, it is very easy to cause a combustion and explosion accident, seriously threatening the lives of personnel and equipment safety. The mixed gas involved in the combustion and detonation process caused by pipeline leakage has multiple sources, and experimental equipment is needed to study and test the changes in key parameters such as its combustion characteristics, detonation pressure, and flame propagation speed under multi-source variable flow.

[0003] At present, the simulation test device for the hydrogen detonation process mainly focuses on igniting the combustible gas mixture with a fixed gas source flow rate through electric spark ignition, and using the experimental data acquisition system to record and analyze the data of its detonation process, which provides an important reference for understanding its basic mechanism. However, the existing test device is difficult to simulate the impact of multi-source gas on the detonation process under actual conditions, and cannot reflect the propagation behavior of the hydrogen detonation process under pipeline failure. The complexity of multi-source variable flow makes its detonation process more difficult to predict. Therefore, it is urgent to develop a test device for testing the hydrogen detonation process under multi-source variable flow. Summary of the invention

[0004] In view of the deficiencies in the prior art, 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 mixed gas detonation process under controllable flow can be tested.

[0005] The present invention provides a test device for testing hydrogen detonation process under multi-source variable flow, 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 multi-source operability.

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

[0011] The multi-source flow regulation system comprises 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 provided with two main pipes extending to the upper and lower parts of the detonation pipeline, and four branch pipes are respectively provided on the two main pipes to enter the detonation pipeline symmetrically from top to bottom; the stop valve (2) and the flow sensor (3) are sequentially provided on the upper main pipe, and the stop valve (8) and the flow sensor (9) are sequentially provided on the lower main pipe, and 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 provided on the four branch pipes branching from the upper main pipe, and the electric valves (10), (11), (12), and (13) are provided on the four branch pipes branching from the lower main pipe, and the gas source entering the detonation pipeline is increased or changed by controlling the opening and closing states of the electric valves of the branch pipes, thereby simulating the accident situation of hydrogen overflow from multiple sources after pipeline failure.

[0012] The simulated detonation pipeline system comprises 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 pipeline. The adjustable high-voltage igniter is first charged to reach a specified voltage, and the igniter discharges to break through the air between the ignition electrodes to generate electric sparks to ignite the gas; the detonation pipeline is a square cross-section pipeline with a size of 300×300 mm and a wall thickness of 6 mm, and a length of 6 m. The multi-hole plate (27) further forms detonation by accelerating the combustion flame, and divides the detonation pipeline into a combustion acceleration section and a detonation test section. The 1m before the detonation pipeline is the acceleration section, and the 5m after the pipeline is the test section, which is the place for the propagation of detonation waves. The observation window (28) is installed in the detonation test section to observe the flame propagation of the detonation process of the combustible gas under multi-source variable flow. The exhaust valve (29) is installed at the end of the detonation pipeline to discharge the combustion gas after the test is completed, so as to ensure the safety of the test.

[0013] The data acquisition system comprises 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 arranged in the combustion acceleration section, and a total of four pressure sensors (15), (16), (17), (18) and four photoelectric sensors (20), (21), (22), (23) are arranged at the rear of the multi-hole plate (11) and the branch pipeline 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 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 pipeline system described in the present invention is made of alloy steel.

[0015] As a further technical solution, the porous orifice plate arranged in the simulated detonation pipeline 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 arranged in the simulated detonation pipeline system of the present invention is 200×2000mm, and is made of high-temperature and pressure-resistant organic glass with a thickness of 20mm.

[0017] As a further technical solution, a high-speed camera is installed opposite to the observation window of the present invention to capture changing images of flame propagation 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 regulating system of the present invention is provided with two outlet main pipes on the hydrogen mixing tank, and a stop valve and a flow sensor are installed on each of the main pipes 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; four branch pipes are respectively branched from the two outlet main pipes to lead into the detonation pipeline, and an electric valve is installed on each of the branch pipes, and the input of multi-source variable flow is realized by controlling the opening and closing of the electric valve, which can further simulate the hydrogen detonation behavior of the actual situation on site after the pipeline fails.

[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 become 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 clearly understood, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings in the specification, 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 schematic diagram of a test device for testing the hydrogen detonation process under variable flow rate.

[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 all 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 exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

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

[0029] like Figure 1 As shown, the test 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, the stop valve (2), the stop valve (8), the electric valve (4) and the electric valve (10) are opened, and the mixed gas is charged into the front end of the detonation pipeline until the preset pressure value is reached, and the charging flow rate is recorded;

[0032] The test is started, the adjustable high-voltage igniter (25) is started, 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 at 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, the detonation behavior of hydrogen overflow from multiple sources in the case of pipeline failure is simulated, the charging 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 exhaust gas, and the test is finished.

[0034] Although the above describes the specific implementation mode 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 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 in that: It includes a multi-source flow regulation system, a simulated explosion pipeline system and a data acquisition system.

2. The multi-source flow regulation system according to claim 1, characterized in that The invention comprises a hydrogen mixing tank (1), stop valves (2), (8), flow sensors (3), (9) and electric valves (4), (5), (6), (7), (10), (11), (12) and (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 respectively provided on the two main pipes to enter the detonation pipeline symmetrically from top to bottom; the stop valve (2) and the flow sensor (3) are sequentially installed on the upper main pipe, and the stop valve (8) and the flow sensor (9) are sequentially installed on the lower main pipe. The main pipeline of the upper part is connected to the main pipeline of the upper part, and the output of the flow rate of the hydrogen mixing tank is controlled by a stop valve, and the total flow data during the test process is obtained according to the output signal of the flow sensor; the electric valves (4), (5), (6), and (7) are installed in the four branch pipelines branched from the upper main pipeline, and the electric valves (10), (11), (12), and (13) are installed in the four branch pipelines branched from the lower main pipeline. By controlling the opening and closing states of the electric valves of the branch pipelines, 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.

3. The simulated detonation piping system according to claim 1, characterized in that The invention comprises 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 igniter (25) is connected to the ignition electrode (26), the ignition electrode (26) is inserted into the front end of the detonation pipe, and the high-voltage igniter discharges and breaks through the air between the ignition electrodes to generate electric sparks to ignite the gas; 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 observation window (28) is installed in the detonation test section to observe the flame propagation of the detonation process of the combustible gas under multi-source variable flow; the exhaust valve (29) is installed at the end of the detonation pipe, and is used to discharge the combustion gas after the test is completed, so as to ensure the safety of the test.

4. The data acquisition system according to claim 1, characterized in that The invention comprises 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 arranged in the combustion acceleration section, and a total of four pressure sensors (15), (16), (17), (18) and four photoelectric sensors (20), (21), (22), (23) are arranged at the rear part of the multi-hole plate (11) and the branch pipeline in the detonation test section to obtain the pressure, flame and temperature data of the detonation process of the combustible gas 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.

5. A test device for testing hydrogen detonation process under multi-source variable flow as described in any one of claims 1 to 4, characterized in that: The test steps include: S10. Before the test, introduce nitrogen to purge the test device and check the tightness of the pipeline to ensure there is no leakage; S20. Before the test, open the stop valve (2), stop valve (8), electric valve (4), and electric valve (10), fill the front end of the detonation pipeline 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 at 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 multi-source overflow in the case of pipeline failure, 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, the exhaust valve (29) is opened to discharge the test exhaust gas, and the test is completed.

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