Experimental device for dust explosion caused by spontaneous combustion flame winding during high-pressure hydrogen leakage

Abstract

The invention provides an experimental device for high-pressure hydrogen leakage spontaneous combustion flame winding dust explosion, which comprises a gas supply system, a high-pressure storage tank, a visual straight pipe, a downstream explosion box, a dust spraying system and a data acquisition control system which are connected in sequence, the high-pressure storage tank is communicated with the downstream explosion box through a visual straight pipe, and the dust spraying system is communicated with the downstream explosion box through a pipeline; and the pressure sensor, the photoelectric sensor, the temperature sensor, the dust spraying system and the air supply system are respectively in communication connection with the data acquisition control system. The experimental device has the advantages that the structural design is simple, and the explosion phenomenon caused by dust winding caused by spontaneous combustion flames can be simulated, so that various parameters of spontaneous combustion explosion are obtained.

Description

Technical Field

[0001] The invention relates to the technical field of secondary explosion of dust entrained by shock waves, and in particular to an experimental device for explosion of dust entrained by spontaneous combustion of high-pressure hydrogen leakage. Background Art

[0002] High-pressure hydrogen will spontaneously combust when released into a pipeline. This is an important safety issue that needs to be addressed in the current development of hydrogen energy applications.

[0003] In actual scenarios, discharge is often in a confined space, and the local spontaneous combustion flame will trigger dust to be blown up and cause an explosion. However, there is currently no experimental equipment that can realize the study of relevant explosion parameters. Summary of the Invention

[0004] The purpose of the present invention is to provide an experimental device for high-pressure hydrogen leakage spontaneous combustion flame dust explosion with simple structural design, which can simulate the explosion phenomenon caused by spontaneous combustion flame triggering dust entrainment and realize the measurement of spontaneous combustion flame parameters.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions: An experimental device for high-pressure hydrogen leakage, self-ignition flame and dust explosion includes a gas supply system, a high-pressure storage tank, a visual straight pipe, a downstream explosion box, a dust spraying system, and a data acquisition and control system connected in sequence. The gas supply system provides high-pressure gas to the high-pressure storage tank, and the high-pressure storage tank is connected to the downstream explosion box through a visual straight pipe. The dust spraying system is connected to the downstream explosion box through a pipeline; the downstream explosion box is equipped with a pressure sensor, and the visual straight pipe is equipped with a pressure sensor and a photoelectric sensor respectively. The pressure sensor, photoelectric sensor, dust spraying system, and gas supply system are respectively communicated with the data acquisition and control system.

[0006] Furthermore, there are several downstream explosion boxes, which are connected to the high-pressure storage tank through several visible straight pipes.

[0007] Furthermore, the front and rear sides of the downstream explosion box are transparent windows, a pressure sensor is arranged on the upper side, the left or right side is connected to a visual straight pipe, and the right or left side is open and bonded with a PVC film.

[0008] Furthermore, a relief membrane is provided at the outlet of the high-pressure storage tank, and a striker is provided at the flange connection between the high-pressure storage tank and the visual straight pipe, and the striker can puncture the relief membrane.

[0009] Furthermore, the gas supply system includes a gas cylinder, a booster pump, and a vacuum pump. The booster pump is connected to the gas cylinder and the high-pressure storage tank through pipelines, and the vacuum pump is connected to the high-pressure storage tank through pipelines. Air stop valves are provided on the pipelines.

[0010] Furthermore, the dust spraying system includes a dust storage tank, a dust storage control starting valve, a compressed gas cylinder, and an inflation control valve. The compressed gas cylinder ventilates the dust storage tank through an inflation pipeline, and the inflation pipeline is regulated by the inflation control valve. The dust storage tank transports dust to the downstream explosion box through a dust conveying pipeline, and the dust conveying pipeline is regulated by the dust storage control starting valve.

[0011] Furthermore, a flow regulator is provided at the outlet of the compressed gas cylinder.

[0012] Furthermore, a pressure sensor and a temperature sensor are provided in the high-pressure storage tank.

[0013] Furthermore, the data acquisition control system includes a high-speed camera, a data acquisition card and a computer. The high-speed camera is used to capture the explosion process of the downstream explosion box, and the data acquisition card is used to collect signal data from each pressure sensor or photoelectric sensor.

[0014] Compared with the prior art, the present invention has the following advantages: The experimental device for detecting dust explosions caused by spontaneous combustion of high-pressure hydrogen gas leakage disclosed by the present invention has a simple structural design and can simulate the explosion phenomenon caused by spontaneous combustion of flames triggering dust entrainment, thereby measuring the parameters of the spontaneous combustion flame, visualizing the downstream explosion box, and studying the flame parameters of the branch pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of embodiment 1 of the present invention.

[0016] Figure 2 It is a structural diagram of embodiment 2 of the present invention.

[0017] Figure numerals: 11. Gas cylinder; 12. Booster pump; 13. Vacuum pump; 14. Air check valve; 2. High-pressure storage tank; 21. Release membrane; 22. Strike pin; 23. Pressure sensor three; 24. Temperature sensor; 3. Visual straight pipe; 31. Pressure sensor two; 32. Photoelectric sensor; 4. Downstream explosion box; 41. Pressure sensor one; 42. Film; 51. Dust storage tank; 52. Dust storage control start valve; 53. Compressed gas cylinder; 54. Inflation control valve; 55. Flow regulator; 61. High-speed camera; 62. Data acquisition card; 63. Computer. DETAILED DESCRIPTION

[0018] The embodiments of the present invention are described in further detail below with reference to the accompanying drawings. Example

[0019] like Figure 1As shown, the experimental device for high-pressure hydrogen leakage, self-ignition flame and dust explosion includes an air supply system, a high-pressure storage tank 2, a visual straight pipe 3, a downstream explosion box 4, a dust spraying system, and a data acquisition and control system connected in sequence. The air supply system provides high-pressure gas to the high-pressure storage tank 2, the high-pressure storage tank 2 is connected to the downstream explosion box 4 through the visual straight pipe 3, and the dust spraying system is connected to the downstream explosion box 4 through a pipeline; the downstream explosion box 4 is provided with a pressure sensor 1 41, and the visual straight pipe 3 is provided with a pressure sensor 2 31 and a photoelectric sensor 32 respectively. The pressure sensor, photoelectric sensor, dust spraying system and air supply system are respectively communicated with the data acquisition and control system.

[0020] The front and rear sides of the downstream explosion box 4 are transparent windows made of tempered glass, which can be used to observe the explosion process; a pressure sensor 41 is arranged on the upper side, and three pressure sensors 41 are arranged at equal intervals to fully sense the pressure changes in the downstream explosion box 4 during the explosion; the left or right side is connected to the visual straight pipe 3, and the corresponding right or left side is open and bonded with a PVC film 42. The film 42 will be opened by the shock wave after the explosion to form an open space, which is a disposable consumable product.

[0021] A relief membrane 21 is provided at the outlet of the high-pressure storage tank 2, and a striker 22 is provided at the flange connection between the high-pressure storage tank 2 and the visual straight pipe 3. The striker 22 can puncture the relief membrane 21. When the gas supply system fills the high-pressure storage tank 2 with gas, as the gas pressure continues to rise, the relief membrane 21 bulges outward and touches the striker 22, at which time the striker 22 can puncture the relief membrane 21.

[0022] The gas supply system includes a gas cylinder 11, a booster pump 12, and a vacuum pump 13. The booster pump 12 is connected to the gas cylinder 11 and the high-pressure storage tank 2 through pipelines, and the vacuum pump 13 is connected to the high-pressure storage tank 2 through pipelines. A gas stop valve 14 is provided on each pipeline.

[0023] The dust spraying system includes a dust storage tank 51, a dust storage control starting valve 52, a compressed gas cylinder 53, and an inflation control valve 54. The dust storage tank 51 is used to store dry powder. A flow regulator 55 is provided at the outlet of the compressed gas cylinder 53. The compressed gas cylinder 53 ventilates the dust storage tank 51 through an inflation pipeline, and the inflation pipeline is regulated by the inflation control valve 54. The dust storage tank 51 transports dust to the downstream explosion box 4 through a dust conveying pipeline, and the dust conveying pipeline is regulated by the dust storage control starting valve 52.

[0024] The high-pressure storage tank 2 is provided with a third pressure sensor 23 and a temperature sensor 24, and the third pressure sensor 23 and the temperature sensor 24 are respectively connected to the data acquisition and control system for communication.

[0025] The data acquisition and control system includes a high-speed camera 61, a data acquisition card 62 and a computer 63. The high-speed camera 61 is used to capture the explosion process of the downstream explosion box 4, and the data acquisition card 62 is used to collect signal data from each pressure sensor or photoelectric sensor; the computer 63 stores, processes and analyzes the data received from the data acquisition card 62 or the high-speed camera 61.

[0026] The working principle of the present invention is as follows: S1) first install the discharge membrane 21 at the outlet of the high-pressure storage tank 2, turn on the vacuum pump 13, evacuate the high-pressure storage tank 2, and then close the valve; S2) unscrew the dust storage tank 51, put in an appropriate amount of dry powder, and tighten the dust storage tank 51; S3) lay the dust in the dust storage tank 51 into the downstream explosion box 4 through the dust spraying system and the pipeline, and fix the PVC film 42; S4) after confirming that the high-pressure storage tank 2 is leak-proof, fill it with combustible gas according to the experimental plan, and use the booster pump 12 to fill the tank. The gas is released, causing the internal pressure of the high-pressure storage tank 2 to continuously rise. After reaching the target pressure, the striker 22 at the flange connection automatically punctures the relief membrane 21; S5) The striker 22 is actuated and the booster pump 12 stops simultaneously, and the high-speed camera 61 begins to record the explosion status of the downstream explosion box 4, automatically spraying dust or liquid mist, and recording pressure data and high-speed image data; S6) After the experiment is completed, the relief membrane 21 and the punctured PVC film 42 are removed and replaced with new ones, and preparations are made for the next experiment. Example

[0027] like Figure 2 As shown, based on Example 1, there are three downstream explosion boxes 4, and correspondingly, there are also three visual straight pipes 3. The three downstream explosion boxes 4 are respectively connected to the same high-pressure storage tank 2 through the visual straight pipes 3, so that the explosion phenomenon caused by multiple spontaneous combustion flames triggering dust entrainment can be simulated and observed.

[0028] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the concept of the present invention. These improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An experimental device for the spontaneous combustion of high-pressure hydrogen gas and the entrainment of dust explosions, characterized by: It includes an air supply system, a high-pressure storage tank, a visual straight pipe, a downstream explosion box, a dust spraying system, and a data acquisition and control system connected in sequence. The air supply system provides high-pressure gas to the high-pressure storage tank, the high-pressure storage tank is connected to the downstream explosion box through a visual straight pipe, and the dust spraying system is connected to the downstream explosion box through a pipeline; the downstream explosion box is equipped with a pressure sensor, and the visual straight pipe is equipped with a pressure sensor and a photoelectric sensor respectively. The pressure sensor, photoelectric sensor, dust spraying system, and air supply system are respectively communicated with the data acquisition and control system.

2. The experimental device for high-pressure hydrogen leakage, spontaneous combustion, flame entrainment and dust explosion according to claim 1 is characterized by: There are several downstream explosion boxes, which are connected to the high-pressure storage tank through several visible straight pipes.

3. The experimental device for high-pressure hydrogen leakage, spontaneous combustion, flame entrainment and dust explosion according to claim 1 or 2, characterized in that: The front and rear sides of the downstream explosion box are transparent windows, a pressure sensor is arranged on the upper side, the left side or the right side is connected to a visual straight pipe, and the right side or the left side is open and bonded with a PVC film.

4. The experimental device for high-pressure hydrogen leakage, spontaneous combustion, flame entrainment and dust explosion according to claim 3 is characterized by: A relief membrane is provided at the outlet of the high-pressure storage tank, and a striker is provided at the flange connection between the high-pressure storage tank and the visual straight pipe, and the striker can puncture the relief membrane.

5. The experimental device for high-pressure hydrogen leakage, spontaneous combustion, flame entrainment and dust explosion according to claim 1 is characterized by: The gas supply system includes a gas cylinder, a booster pump, and a vacuum pump. The booster pump is connected to the gas cylinder and the high-pressure storage tank through pipelines respectively, and the vacuum pump is connected to the high-pressure storage tank through pipelines. Air stop valves are provided on the pipelines.

6. The experimental device for detecting high-pressure hydrogen leakage, spontaneous combustion, flame entrainment, and dust explosion according to claim 1 is characterized by: The dust spraying system includes a dust storage tank, a dust storage control starting valve, a compressed gas cylinder, and an inflation control valve. The compressed gas cylinder ventilates the dust storage tank through an inflation pipeline, and the inflation pipeline is regulated by the inflation control valve. The dust storage tank transports dust to the downstream explosion box through a dust conveying pipeline, and the dust conveying pipeline is regulated by the dust storage control starting valve.

7. The experimental device for detecting high-pressure hydrogen leakage, spontaneous combustion, flame entrainment, and dust explosion according to claim 6, is characterized in that: A flow regulator is provided at the outlet of the compressed gas cylinder.

8. The experimental device for high-pressure hydrogen leakage, spontaneous combustion, flame entrainment and dust explosion according to claim 1 is characterized by: A pressure sensor and a temperature sensor are provided in the high-pressure storage tank.

9. The experimental device for high-pressure hydrogen leakage, spontaneous combustion, flame entrainment and dust explosion according to claim 1, 2 or 8, characterized in that: The data acquisition control system includes a high-speed camera, a data acquisition card and a computer. The high-speed camera is used to shoot the explosion process of the downstream explosion box, and the data acquisition card is used to collect signal data from each pressure sensor or photoelectric sensor.

Images