A multi-parameter adjustable combustible gas explosion visualization experimental device

Abstract

The present invention discloses a multi-parameter adjustable combustible gas explosion visualization experimental device, comprising a main body, a ball valve, a pulse igniter, a pressure sensor, a C-shaped fastening fixture, a solid pressure relief port clamp, and a pressure relief plate; the main body is mainly composed of an acrylic plate, and the top of the main body is provided with more than two openings; the solid pressure relief port clamp and the pressure relief plate are respectively installed on the openings, and are both fixed with a C-shaped fastening fixture; the ball valve and the pulse igniter are both installed on the side of the main body; the pressure sensor is installed on the main body, and the main body is provided with an exhaust port. The present invention realizes the adjustment of different working conditions by changing the pressure relief area, the pressure relief position, the lightweight pressure relief material and the aspect ratio in the same device, and the experimental process has a good visualization effect.

Description

Technical Field

[0001] The invention belongs to the technical field of combustible gas explosion, and particularly relates to a combustible gas explosion visualization experimental device with adjustable multiple parameters. Background Art

[0002] The top of the hazardous chemical warehouse is equipped with a pressure relief roof. When an explosion occurs inside, the pressure relief roof may be opened, thereby releasing the internal burned gas and unburned gas to the outside of the warehouse. The quality, position and size of the pressure relief roof have a significant impact on the degree of combustible gas explosion disaster. If the area of ​​the pressure relief roof is increased or the quality of the pressure relief roof is reduced, the impact of the explosion shock wave on the warehouse wall and warehouse structure can be reduced, achieving the purpose of reducing the explosion disaster effect.

[0003] It is difficult to complete large-scale combustible gas explosion experiments in laboratory environments, and small-scale experiments have become the first choice for conducting research. At present, the combustible gas explosion experimental device has the following problems during use:

[0004] (1) The explosion process inside the device is difficult to observe

[0005] During the explosion of combustible gas, the shock waves under different flame forms have different intensities. It is necessary to observe the flame development inside the device and the flame form during pressure relief. For example, patent CN200610040578.5 discloses a multifunctional gas explosion experimental system, but it is made of steel and the internal flame form cannot be observed.

[0006] (2) The device has a single structure and cannot meet the needs of multi-parameter research

[0007] The size, location and quality of the pressure relief vent are key parameters that affect the degree of explosion hazard, and explosion hazards under multiple influencing parameters are currently a hot topic. The research on the impact of a single parameter on explosion hazards is becoming increasingly mature. For example, patent CN201020617559.6 discloses a thin-walled gas explosion experimental device with a vent, but the device only has a single vent, and the vent removal and replacement process is complicated, and it cannot be adjusted according to the needs of the experimental scene.

[0008] In view of the above shortcomings, a combustible gas explosion visualization experimental device with adjustable aspect ratio, pressure relief area, pressure relief position and pressure relief material quality was proposed. Summary of the invention

[0009] The purpose of the present invention is to provide a combustible gas explosion visualization experimental device with adjustable multiple parameters. By adjusting the number, quality and position of the pressure relief plates, the explosion process in the combustible gas leakage and explosion scenario in a hazardous chemical warehouse is simulated. The device is a combustible gas explosion visualization experimental device with adjustable aspect ratio, pressure relief area, pressure relief position and pressure relief material quality.

[0010] The present invention is achieved by at least one of the following technical solutions.

[0011] A multi-parameter adjustable combustible gas explosion visualization experimental device comprises a main body, a ball valve, a pulse igniter, a pressure sensor, a C-shaped fastening fixture, a solid pressure relief port clamp, a pressure relief plate, and a sealing gasket groove; the main body is mainly composed of an acrylic plate, and the top of the main body is provided with more than two openings, namely, pressure relief ports; the solid pressure relief port clamp and the pressure relief plate are respectively installed on the openings and are both fixed with a C-shaped fastening fixture; the ball valve and the pulse igniter are both installed on the side of the main body; the pressure sensor is installed on the main body, and the main body is provided with an exhaust port.

[0012] Furthermore, the main body includes a first main body and a second main body; the first main body and the second main body are both rectangular blocks made of transparent acrylic plates, the top of each main body is set to have more than two openings, the first main body and the second main body are connected by a flange, and the connection between the flanges is fixed with fastening bolts.

[0013] Furthermore, the first body is provided with a ball valve and a pulse igniter, and the second body is provided with an exhaust port.

[0014] Furthermore, the flange is a square structure, fixing the first body and the second body.

[0015] Furthermore, the pressure relief plate is installed on the opening of the main body through a hollow pressure relief port clamp and is fixed with a C-shaped fastening clamp.

[0016] Furthermore, there are a total of several pressure sensors, which are fixed on the main body at equal intervals through through threaded holes and are used to collect pressure changes during the explosion process of the combustible gas.

[0017] Furthermore, the ignition energy of the pulse igniter can be adjusted and changed according to the minimum ignition energy of different premixed combustible gases in the device.

[0018] Furthermore, the pressure relief plate is a lightweight pressure relief material used for releasing unburned gas and burned gas, and exhibits a crushing effect when its surface pressure reaches a fixed value after an explosion; the lightweight pressure relief material is a polyethylene film or a calcium carbonate sheet of different thicknesses.

[0019] Furthermore, a sealing gasket groove is provided at the opening of the main body for placing a sealing gasket.

[0020] Furthermore, the sealing gasket is square and is located between the hollow pressure relief port clamping plate and the sealing gasket groove, ensuring that the device has good sealing performance.

[0021] Furthermore, the C-shaped fastening clamps are evenly and symmetrically distributed on both sides of the hollow pressure relief port clamp and the solid pressure relief port clamp, and the C-shaped fastening clamps are provided with threads for adjusting the fastening degree to fix the clamp on the main body.

[0022] Furthermore, the pressure relief plate is a sealing material for the top pressure relief port, which is used to restrict the release of gas in the device, and exhibits a crushing effect when its surface pressure reaches a fixed value after an explosion occurs.

[0023] Furthermore, the solid pressure relief port clamp is used to seal the pressure relief port to prevent internal gas from escaping.

[0024] Compared with the existing technology, the present invention has the following beneficial effects:

[0025] The present invention realizes the adjustment of different working conditions by changing the pressure relief area, pressure relief position, lightweight pressure relief material and aspect ratio in the same device, and the experimental process has a good visualization effect. The specific performance is as follows:

[0026] 1. In terms of the pressure relief area and the pressure relief position parameters, they can be adjusted by changing the number and position of the solid pressure relief port splints and the hollow pressure relief port splints on the top of the device. In terms of changing the aspect ratio parameters, the device length can be increased or shortened through flange connection to obtain experimental conditions with different aspect ratios. In terms of the pressure relief material parameters, different pressure relief port opening pressure experimental conditions can be obtained by replacing pressure relief materials of different strengths and fixing the hollow pressure relief port splints to the pressure relief port of the device. The present invention is easy to operate and can be flexibly combined to achieve the adjustment of multiple experimental conditions;

[0027] 2. The device has a sealing gasket groove on the top of the device body, which is sealed by a sealing gasket and fixed with a C-shaped fastening clamp, so that the present invention can ensure good air tightness during the replacement of premixed combustible gas;

[0028] 3. This device is made of transparent acrylic plate, which is convenient for observing the entire process of ignition initial stage, flame acceleration development stage and discharge stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the structure of a multi-parameter adjustable combustible gas explosion visualization experimental device in this embodiment;

[0030] Figure 2 This is a cross-sectional view of the installation of the C-shaped fastening fixture, the hollow pressure relief port clamp, and the pressure relief plate of this embodiment;

[0031] Among them, 1-ball valve, 2-pulse igniter, 3-pressure sensor, 4-C-shaped fastening clamp, 5-solid pressure relief port clamp, 6-hollow pressure relief port clamp, 7-pressure relief plate, 8-bolts, 9-flange, 10-exhaust port, 11-acrylic plate, 12-sealing gasket, 13-sealing gasket groove. DETAILED DESCRIPTION

[0032] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples. It should be understood that the specific examples described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] like Figure 1 A multi-parameter adjustable combustible gas explosion visualization experiment device is shown, comprising a main body, a ball valve 1, a pulse igniter 2, a pressure sensor 3, a C-shaped fastening fixture 4, a solid pressure relief port clamp 5, a hollow pressure relief port clamp 6, a pressure relief plate 7, a bolt 8, a flange 9, an exhaust port 10, an acrylic plate 11, a sealing gasket 12, and a sealing gasket groove 13. The main body comprises a first main body and a second main body; the first main body and the second main body are both rectangular formed of a transparent acrylic plate 11, and two openings, namely pressure relief ports, are arranged on the top of each main body, and the solid pressure relief port clamp 5 and the pressure relief plate 7 are respectively installed on the openings, and the installation positions of the solid pressure relief port clamp 5 and the pressure relief plate 7 can be interchanged.

[0034] The first body and the second body are connected by a flange 9, and the fastening bolts 8 fix the connection of the flange 9. The acrylic plate 11 is the material of the device body, which realizes the visualization of the explosion process and facilitates the observation and recording of the flame acceleration development process. Multiple bodies can be added as needed, and the bodies are connected by flanges.

[0035] The pressure relief plate 7 is fixed on the opening of the main body and between the hollow pressure relief port clamping plate 5 through the hollow pressure relief port clamping plate 6, and can be replaced with polyethylene films or calcium carbonate sheets of different thicknesses as needed.

[0036] like Figure 2 As shown, the sealing gasket 12 is located between the sealing gasket groove 13 on the main body and the hollow pressure relief port clamp 6 for sealing; the C-shaped fastening fixture 4 clamps the pressure relief plate 7 with the sealing gasket 12 and the hollow pressure relief port clamp 6 to further enhance the sealing performance of the experimental device.

[0037] The C-shaped fastening clamp 4 is used to fix the solid pressure relief port clamp 5 and the hollow pressure relief port clamp 6. The C-shaped fastening clamp 4 is evenly and symmetrically distributed on both sides of the hollow pressure relief port clamp 5, the solid pressure relief port clamp 6 and the pressure relief plate 7. The clamp 4 has threads for adjusting the degree of fastening.

[0038] The pulse igniter 2 and the ball valve 1 are both installed on the side of the first body through threads; the air outlet 10 is arranged on the second body.

[0039] The ball valve 1 at the air inlet controls the premixed combustible gas to enter the device, and the air outlet 10 is closed after the air inside the device has been replaced by the premixed gas of the combustible gas and air.

[0040] The pulse igniter 2 can set the minimum ignition energy according to the characteristics of the combustible gas to ignite the internal premixed combustible gas.

[0041] There are five pressure sensors 3, one of which is located near the pulse igniter 2 to monitor the pressure changes at the ignition end, and the remaining four pressure sensors 3 are fixed to the rear wall of the main body at equal intervals with through threaded holes, and the detection end of the pressure sensor 3 coincides with the inner wall of the device.

[0042] When the present invention is used to conduct a combustible gas explosion experiment, first, the sealing gasket 12 is placed in the sealing gasket groove 13 at the top of the main body, and at the same time, the pressure relief plate 7 covers the pressure relief port, and the hollow pressure relief port clamp 6 is covered and fixed with a C-shaped fastening clamp 4; the remaining pressure relief ports are covered with a solid pressure relief port clamp 5 and fixed with a C-shaped fastening clamp 4; the air inlet ball valve 1 is opened to put the premixed combustible gas into the device, and after the air inside the device has been replaced with the premixed combustible gas, the air outlet 10 and the air inlet ball valve 1 are closed; the pulse igniter 2 is controlled to ignite through a computer, and at the same time, the pressure sensor 3 starts to collect pressure data, and the high-speed camera records the entire process of ignition, flame acceleration development, and discharge inside the device through the acrylic plate 11.

[0043] Since the number of pressure relief ports, the position of the pressure relief ports, and the pressure relief plate 7 in the present invention can be flexibly adjusted according to demand, the pressure relief phenomenon of combustible gas explosion in a hazardous chemical warehouse under different working conditions can be simulated. The transient pressure size and flame propagation speed parameters of the explosion process can be captured by the pressure sensor 3 and the high-speed camera to study the flame acceleration development and decay mechanism, which is of great significance for the reduction effect of combustible gas explosion.

[0044] The above description is only a specific implementation case of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred implementation case as above, it is not intended to limit the present invention. Any technician familiar with this profession can make certain changes or modifications to the structure and technical content disclosed above without departing from the scope of the technical solution of the present invention to become an equivalent implementation case with equivalent changes.

Claims

1. A multi-parameter adjustable combustible gas explosion visualization experimental device, characterized in that: The invention comprises a main body, a ball valve (1), a pulse igniter (2), a pressure sensor (3), a C-shaped fastening fixture (4), a solid pressure relief port clamp (5), and a pressure relief plate (7); the main body is mainly composed of an acrylic plate (11), and the top of the main body is provided with more than two openings, namely, pressure relief ports; the solid pressure relief port clamp (5) and the pressure relief plate (7) are respectively installed on the openings and are both fixed by the C-shaped fastening fixture (4); the ball valve (1) and the pulse igniter (2) are both installed on the side of the main body; the pressure sensor (3) is installed on the main body, and the main body is provided with an exhaust port (10); The main body comprises a first main body and a second main body; the first main body and the second main body are both rectangular parallelepiped bodies formed of a transparent acrylic plate (11); the top of each main body is provided with more than two openings; the first main body and the second main body are connected via a flange (9); the connection of the flange (9) is fixed by a fastening bolt (8); The first body is provided with a ball valve (1) and a pulse igniter (2), and the second body is provided with an exhaust port (10); The pressure relief plate (7) is installed on the opening of the main body through the hollow pressure relief port clamp (6) and is fixed by a C-shaped fastening clamp (4); the pressure relief plate (7) is a lightweight pressure relief material used for releasing unburned gas and burned gas, and exhibits a crushing effect when its surface pressure reaches a fixed value after an explosion occurs; the lightweight pressure relief material is a polyethylene film or a calcium carbonate sheet of different thicknesses; A sealing gasket groove (13) is provided at the opening of the main body for accommodating a sealing gasket (12); the sealing gasket (12) is square and is located between the hollow pressure relief port clamping plate (6) and the sealing gasket groove (13), thereby ensuring that the device has good sealing performance; When using the present invention to conduct a combustible gas explosion experiment, first, the sealing gasket (12) is placed in the sealing gasket groove (13) at the top of the main body, and at the same time, the pressure relief plate (7) covers the pressure relief port, and the hollow pressure relief port clamp (6) is covered and fixed with a C-shaped fastening clamp (4); the remaining pressure relief ports are covered with a solid pressure relief port clamp (5) and fixed with a C-shaped fastening clamp (4); the air inlet ball valve 1 is opened to allow the premixed combustible gas to be introduced into the device, and after the air inside the device has been replaced with the premixed combustible gas, the exhaust port (10) and the air inlet ball valve (1) are closed; the pulse igniter (2) is controlled by a computer to ignite, and at the same time, the pressure sensor (3) starts to collect pressure data, and a high-speed camera records the entire process of ignition, flame acceleration and discharge inside the device through an acrylic plate (11).

2. A multi-parameter adjustable combustible gas explosion visualization experimental device according to claim 1, characterized in that: The flange (9) is a square structure and fixes the first body and the second body.

3. The multi-parameter adjustable combustible gas explosion visualization experimental device according to claim 1 is characterized in that: There are a total of several pressure sensors (3), which are fixed on the main body at equal intervals through through threaded holes and are used to collect pressure changes during the explosion process of the combustible gas.

4. The multi-parameter adjustable combustible gas explosion visualization experimental device according to claim 1 is characterized in that: The ignition energy of the pulse igniter (2) can be adjusted and changed according to the minimum ignition energy of different premixed combustible gases in the device.

5. The multi-parameter adjustable combustible gas explosion visualization experimental device according to claim 1, characterized in that: The C-shaped fastening clamps (4) are evenly and symmetrically distributed on both sides of the solid pressure relief port clamp (5) and the hollow pressure relief port clamp (6). The C-shaped fastening clamps (4) are provided with threads for adjusting the degree of fastening, and the clamps are fixed to the main body.

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