Gas-solid two-phase explosion venting dynamic inhibition experimental system and method

Abstract

This invention discloses a dynamic suppression experimental system and method for gas-solid two-phase explosion venting, belonging to the field of explosion venting. It includes an explosion container, a gas distribution system, a dynamic ignition system, a data acquisition system, a dynamic water mist / powder explosion suppression system, and a computer. The dynamic water mist / powder explosion suppression system includes a water inlet block, which is movably engaged with the upper inner wall of the explosion container and can move and seal along a second strip-shaped hole on the wall. The water inlet block has a flat plate portion and an arc-shaped plate portion. The flat plate portion is connected to a water inlet pipe (extending out of the container) and has an internal cavity; the lower end is connected to a rotator (with a water-containing cavity), and the arc-shaped plate portion is equipped with a third rubber ring to seal the rotator. The water inlet block and the rotator are connected by first and second through holes, respectively. A water mist / powder nozzle is installed at the lower end of the rotator, and the water inlet pipe is connected to a high-pressure water source. The water inlet block is equipped with a support, and the support is equipped with a drive structure to rotate the rotator. This device and method can explore the difference between dynamic and static explosion suppression and can explore the coupling effect of dynamic explosion suppression with the location of the explosion source.

Description

Technical Field

[0001] This invention belongs to the field of explosion venting technology, specifically relating to a dynamic suppression experimental system and method for gas-solid two-phase explosion venting. Background Technology

[0002] With the rapid development of industries such as industry, chemical industry, and coal mining, gas-solid two-phase explosion accidents occur frequently. To address these accidents and reduce their severity, various research and experimental systems and techniques for suppressing gas-solid two-phase explosions have been developed.

[0003] In the prior art, the patent application number 202110842988.6 entitled "Experimental System and Method for Studying the Characteristics of Gas-Dust Composite Explosion in a Visualized Sealed Container and Its Protection" proposes to use an ultra-fine water mist system to suppress the explosion flame.

[0004] However, this technical solution has obvious limitations: its ultrafine water mist system is fixedly installed at a specific location on the explosion container, which is a static deployment mode for ultrafine water mist. Because the spray direction and installation position of the ultrafine water mist are fixed and singular, it is difficult to accurately align it with the actual propagation direction of the explosion shock wave, which prevents the ultrafine water mist from fully exerting its effect, ultimately affecting the explosion suppression effect and reducing the overall explosion suppression capability. Summary of the Invention

[0005] This invention proposes a gas-solid two-phase explosion suppression dynamic suppression experimental system and method, which can realize the dynamic deployment of ultrafine water mist and study the explosion suppression effect on different explosion sources (i.e. different explosion locations).

[0006] To achieve the above objectives, the present invention proposes the following technical content: A gas-solid two-phase explosion suppression dynamic suppression experimental system includes: an explosion container, a gas distribution system, a dynamic ignition system, a data acquisition system, a dynamic water mist / powder explosion suppression system, and a computer; The dynamic water mist / powder explosion suppression system includes the following components: The water inlet block is movably mounted on the upper inner wall of the explosive container; a second strip-shaped hole is provided on the upper inner wall of the explosive container; the water inlet block can move along the length of the second strip-shaped hole and ensure that the gas inside the explosive container will not be exchanged with the outside through the second strip-shaped hole. The water inlet block includes a flat plate at the top and an arc-shaped plate at the bottom. A rotator is rotatably connected to the water inlet block via a bracket. A water inlet pipe is connected to the flat plate, and the upper end of the water inlet pipe extends from the second strip-shaped hole into the explosive container. A cavity is formed in the water inlet block, and a water-containing cavity is formed in the rotator. A third annular rubber ring is fixed on the arc surface of the arc-shaped plate, and the third rubber ring contacts the circumferential side wall of the rotator. A first through hole is formed at the lower end of the water inlet block, and a second through hole is formed at the upper end of the rotator. From a top-down view, both the first and second through holes are within the circle enclosed by the third rubber ring. Multiple water mist / powder nozzles are installed at the lower end of the rotator. A high-pressure water source is connected to the upper end of the water inlet pipe. The water inlet pipe, the cavity, the first through hole, the second through hole, the water-containing cavity, and the multiple water mist / powder nozzles are interconnected. A bracket is fixedly installed on the water inlet block, and the rotator can rotate relative to the bracket around its own axis. The bracket is equipped with a drive structure for rotating the rotator.

[0007] Furthermore, the driving structure includes: An explosion-proof motor is mounted on a bracket, with gears installed on its shaft. The gear ring is fixed to the side wall of the rotator and meshes with the gear. The gear ring and the rotator are driven to rotate as a whole by an explosion-proof motor.

[0008] The rotating device can be made to rotate relative to the support around its own axis by a drive structure, thereby changing the angle of the water mist / powder sprayed by the water mist / powder nozzle. The effect of water mist / powder on explosion suppression will be different when the angle of water mist / powder changes, because the effect of explosion suppression is related to the direction of the explosion shock wave and the direction of water mist / powder spray. When the spray direction of water mist / powder changes continuously, there is a greater chance that it will couple with the direction of the explosion shock wave. By using the above-mentioned drive structure, the effect of dynamic explosion suppression can be explored.

[0009] Furthermore, a second connecting rod is fixedly connected to the water inlet block. The upper end of the second connecting rod extends out of the explosion container from the second strip hole. A second electric push rod is fixedly installed on the outer upper surface of the explosion container. The telescopic end of the second electric push rod is fixedly connected to the second connecting rod. The second electric push rod is used to move the second connecting rod and the water inlet block as a whole along the length direction of the second strip hole.

[0010] The dynamic explosion suppression effect is not only caused by changes in the angle of the water mist / powder, but also by the dynamic explosion suppression generated by the second electric actuator displacing the water mist / powder in the left and right directions. The combined effect of these two factors allows for a more comprehensive exploration of the differences and advantages of dynamic explosion suppression compared to static explosion suppression.

[0011] Furthermore, the dynamic ignition system includes: a second strip-shaped hole formed on the explosive container, the second strip-shaped hole and the first strip-shaped hole being located on two opposite side walls of the explosive container respectively; a sliding plate being movably engaged in the internal cavity of the explosive container, the sliding plate being able to slide along the length direction of the first strip-shaped hole and ensuring that the gas inside the explosive container does not exchange with the outside through the first strip-shaped hole; a first connecting rod being fixedly connected to the sliding plate, the lower end of the first connecting rod extending out of the explosive container from the first strip-shaped hole; a first electric push rod being fixedly connected to the lower outer surface of the explosive container, the telescopic end of the first electric push rod being fixedly connected to the first connecting rod; the first electric push rod being used to move the sliding plate and the first connecting rod as a whole along the length direction of the second strip-shaped hole; an ignition electrode being fixedly installed on the sliding plate, the ignition electrode being connected to a power source outside the explosive container via a wire.

[0012] By employing a dynamic ignition system, the location of the explosion source can be changed, providing different explosion sources for the experiment, further collecting more dynamic explosion suppression data, and gaining further insights into dynamic explosion suppression.

[0013] Furthermore, glass windows are installed on the front and rear side walls of the explosive container, and the schlieren system in the data acquisition system can observe the microscopic flow field inside the explosive container through the glass windows; the explosion vent of the explosive container is located on the right side of the explosive container, and the pressure acquisition system in the data acquisition system is 0.5-2m away from the explosion vent.

[0014] The data acquisition system collects data from inside the container, such as concentration, pressure, and temperature, which is a means of obtaining dynamic explosion suppression data. Schlieren and pressure acquisition systems are the simplest means of collecting explosion relief data. Externally, high-speed cameras and high-speed infrared thermal imagers are added to record dynamic images of the explosion and temperature distribution during the explosion process, respectively.

[0015] Furthermore, a dynamic suppression experimental method for gas-solid two-phase explosion venting includes the following steps: S1: Equipped with a gas-solid two-phase explosion suppression dynamic suppression experimental system; S2: The computer sends a gas distribution command to the gas distribution system, which then completes the gas distribution work. S3: The computer sends a movement command to the dynamic ignition system, causing the ignition electrode in the dynamic ignition system to be located at position A inside the explosion container. S4: The computer sends an ignition command to the dynamic ignition system, causing an explosion; at the same time as sending the ignition command, a static explosion suppression command is sent to the dynamic water mist / powder explosion suppression system, the water mist / powder nozzle sprays water mist / powder, the second electric push rod and the explosion-proof motor do not move, realizing static explosion suppression; the computer collects the micro-flow field data monitored by the schlieren system and the pressure data monitored by the pressure acquisition system. S5: The computer sends a gas distribution instruction to the gas distribution system, and the gas distribution system re-distributes the gas according to the same gas distribution instruction in S2. The gas distribution system then completes the gas distribution work again. S6: The computer sends a movement command to the dynamic ignition system, causing the ignition electrode in the dynamic ignition system to be located at position A inside the explosion container. S7: The computer sends an ignition command to the dynamic ignition system, causing an explosion; at the same time as issuing the ignition command, a dynamic explosion suppression command is issued to the dynamic water mist / powder explosion suppression system, the second electric push rod reciprocates, and the explosion-proof motor is activated, causing the rotator to rotate back and forth, and the valve on the water inlet pipe is opened. Compared with S4, where only the position and angle of the water mist / powder nozzle 22 changes, dynamic explosion suppression is achieved; the computer collects the micro-flow field data monitored by the schlieren system and the pressure data monitored by the pressure acquisition system. S8: Compare the static and dynamic explosion suppression data collected in S5 and S7 to explore the differences and benefits of dynamic and static explosion suppression. S9: Repeat S2-S8, change the position of the ignition electrode in the dynamic ignition system, obtain more experimental data, and further explore the influence of the ignition position on the dynamic explosion suppression position and angle.

[0016] Furthermore, the explosion-proof motor enables the rotator to rotate at a maximum angle of 30°.

[0017] Within a 30° range, the first and second through holes can be prevented from leaving the area enclosed by the third rubber ring.

[0018] The beneficial effects that can be achieved by adopting the above technical solutions are: This research aims to explore the differences between dynamic and static explosion suppression, and to study the coupling relationship between dynamic explosion suppression and the location of the explosion source through data analysis. The dynamic water mist / powder explosion suppression system can not only change the direction of the water mist, but also its position, and dynamically adjust it during the propagation of the explosion shock wave. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this experimental system; Figure 2 This is a schematic diagram of the experimental system.

[0020] 1. Explosion container; 2. Glass window; 3. Vacuum pump; 4. Gas distribution instrument; 5. High-pressure powder storage tank; 6. High-pressure combustible gas storage tank; 7. Inlet nozzle; 8. Pressure gauge; 9. First slotted orifice; 10. Slide plate; 11. First rubber ring; 12. First connecting rod; 13. First electric actuator; 14. Ignition electrode; 15. Water inlet block; 16. Water inlet pipe; 17. Rotator; 18. Explosion-proof motor; 19. First through hole; 20. Second through hole; 21. Third sealing ring; 22. Water mist / powder nozzle; 23. Second rubber ring; 24. Schlieren acquisition system; 25. Pressure acquisition system; 26. Computer; 27. Second slotted orifice; 28. Second connecting rod; 29. ​​Second electric actuator; 30. Support. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1: As Figure 1 As shown in Figure 1, a gas-solid two-phase explosion suppression dynamic suppression experimental system includes a visual explosion container 1, a gas distribution system, a dynamic ignition system, a data acquisition system, a dynamic water mist / powder explosion suppression system, and a computer 26.

[0023] The visual explosion container 1 is a rectangular container made of stainless steel (length*width*height 80*60cm). The explosion relief disc (explosion pressure 0.1-0.3MPa) is located on the right side of the visual explosion container 1. An explosion chamber is provided inside the container. The opposite sidewall of the visual explosion container 1 (i.e....) Figure 1 Glass windows 2 (quartz glass) are installed on both sidewalls perpendicular to the plane of the paper, which are used by the schlieren system described later to observe the microscopic flow field inside the explosion container 1 through the glass windows 2.

[0024] The gas distribution system is existing technology used to fill the explosion chamber with combustible gas or solid powder. It includes a vacuum pump 3, a gas distributor 4, a high-pressure powder storage tank 5, a high-pressure combustible gas storage tank 6, an inlet nozzle 7, a pressure gauge 8, and corresponding pipelines (including valves). The operation of the gas distribution system is controlled by a computer 26. The vacuum pump 3, pressure gauge 8, and inlet nozzle 7 are all installed on the explosion container. The high-pressure powder storage tank 5, the high-pressure combustible gas storage tank 6, and the gas distributor 4 are connected to the inlet nozzle 7 through corresponding pipelines.

[0025] The specific gas distribution process is as follows: When the computer 26 issues a gas distribution command to the gas distribution system, the gas distribution system controls the vacuum pump 3 to start. The vacuum pump 3 evacuates the explosion chamber of the visual explosion container 1 to a negative pressure (e.g., -95 kPa) through the corresponding pipeline. The corresponding pressure is monitored by the pressure gauge 8 installed on the explosion container 1. The pressure value is transmitted to the computer 26. When the pressure value reaches the preset pressure in the computer 26 program, the gas distribution instrument 4 stops the vacuum pump 3 and controls the electromagnetic valve on the corresponding vacuum pipeline to close. Then, computer 26 sends preset gas mixing data to gas mixer 4. Gas mixer 4 starts mixing gas according to the gas mixing data. Gas mixer 4 opens the valve on the pipeline corresponding to high-pressure combustible gas storage tank 6. Due to the high pressure inside the tank, high-pressure combustible gas is automatically filled into explosion container 1. Gas mixer monitors the gas mixing volume. After reaching the preset volume, gas mixer closes the valve on the pipeline corresponding to high-pressure combustible gas storage tank 6. At this point, the combustible gas filling is complete. Gas mixer 4 continues mixing gas according to the gas mixing data. Gas mixer 4 opens the valve on the high-pressure powder storage tank 5 and the corresponding pipeline. High-pressure aluminum powder is filled into the cavity of explosion container 1 through inlet nozzle 7. After reaching the preset target concentration (the concentration is monitored by a laser concentration sensor installed on the explosion container and transmitted to gas mixer 4; the laser concentration sensor is not shown in the figure), gas mixer 4 closes the valve on the corresponding pipeline. At this point, the entire gas mixing process is completed.

[0026] The dynamic ignition system is used to adjust the ignition position of the combustible gas in the explosion cavity, thereby enabling the investigation of the coupling effect between different ignition positions and dynamic explosion suppression positions.

[0027] Dynamic ignition systems include: The first strip-shaped hole 9 is located on the bottom side wall of the explosive container 1 (the bottom of the explosive container has a supporting structure, so the bottom of the explosive container 1 does not contact the ground). The first strip-shaped hole 9 and the aforementioned two glass windows 2 are located on different side walls of the explosive container 1. The length direction of the first strip-shaped hole 9 is along... Figure 1 Left and right directions.

[0028] Skateboard 10, see Figure 1 and Figure 2 It is located inside the cavity of the explosive container 1, and is movably engaged on the lower inner wall of the explosive container 1 (a slide rail exists on the bottom wall of the explosive container 1), allowing it to slide relative to the inner wall of the explosive container 1 (i.e., along...). Figure 1(Sliding left and right). A first annular rubber ring 11 is bonded and fixed to the lower surface of the slide plate 10. The lower surface of the slide plate 10 and the lower inner wall of the explosion container 1 are pressed together, causing the first rubber ring 11 to deform. In the top view, the projected area inside the first rubber ring always completely covers the projected area of ​​the first strip hole 9. With this design, when the slide plate and the first rubber ring 11 slide as a whole, the first strip hole is always located inside the ring of the first rubber ring 11. The first rubber ring prevents outside air from communicating with the explosion cavity through the first strip hole 9.

[0029] The first connecting rod 12 is fixedly connected to the lower surface of the slide plate 10, and extends out of the explosion container 1 from the first slot 9. A first electric push rod 13 (with a maximum thrust of 120N, sufficient to move the slide plate 10) is fixedly installed on the lower exterior of the explosion container 1. The telescopic rod of the first electric push rod 13 is fixedly connected to the first connecting rod 12. Under the control of the computer 26, the first electric push rod 13 extends and retracts (at a speed of 0.1m / s), causing the first connecting rod 12 and the slide plate 10 to slide as a whole (the moving length is along the length of the first slot 9). The ignition electrode 14 is installed on the slide plate 10 and located inside the explosion cavity, moving synchronously with the slide plate 10. When the slide plate 10 and the ignition electrode 14 slide as a whole, the position of the ignition electrode 14 inside the explosion cavity changes in the left-right direction. When the ignition electrode 14 is energized, it changes the explosion position. The ignition electrode 14 is connected to the power source outside the explosion chamber by a flexible wire with a certain margin. The wire passes through the slide plate 10 and the first strip hole 9 and is connected to the ignition electrode 14 to avoid interference and breakage of the wire during the movement of the slide plate 10.

[0030] Dynamic water mist / powder explosion suppression systems include: The water inlet block 15 is movably mounted on the upper inner wall of the explosion container 1 (a slide rail is provided on the upper surface of the explosion container). It can slide left and right relative to the explosion container 1, and its movement direction is the same as that of the sliding plate 10. However, the dynamic water mist / powder explosion suppression system and the dynamic ignition system are controlled by computer signals to achieve independent movement.

[0031] The water inlet block 15 consists of two parts: a flat plate at the upper end and an arc plate at the lower end.

[0032] A second strip-shaped hole 27 is provided on the upper inner wall of the explosive container 1. The length direction of the second strip-shaped hole 27 is along the left-right direction. A water inlet pipe 16 is fixedly connected to the upper surface of the flat plate. The upper end of the water inlet pipe 16 extends out of the explosive container 1 through the second strip-shaped hole 27. When the water inlet block 15 slides in the left-right direction, the water inlet pipe 16 slides within the second strip-shaped hole 27. Similar to the aforementioned sliding plate 10, a second annular rubber ring 23 is fixedly connected to the upper surface of the water inlet block 15. Similar to the principle of the first rubber ring 11, in the top view, the projected area inside the second rubber ring completely covers the projected area of ​​the second strip-shaped hole 7. With this design, during the movement of the water inlet block, the second rubber ring always blocks the exchange between the explosive cavity and the outside through the second strip-shaped hole 7. The upper end of the water inlet pipe 16 is threaded for connection with an external high-pressure water source through a threaded joint. The pipe connecting the two uses a flexible pipe with a certain margin to avoid interference and pipe breakage during the movement of the water inlet block 15.

[0033] A second connecting rod 28 is also fixedly connected to the upper surface of the flat plate, and the upper end of the second connecting rod 28 extends out of the explosion chamber from the second strip hole 27. A second electric push rod 29 (maximum thrust 120N) is fixedly installed on the upper outer wall of the explosion container 1. The telescopic end of the second electric push rod 29 is fixedly connected to the second connecting rod 28. Under the extension and retraction of the second electric push rod 29, the second connecting rod 28, the water inlet block 15, and the water inlet pipe 16 slide as a whole in the left and right direction.

[0034] The lower surface of the arc plate is an arc surface (see...) Figure 2 The upper surface is integrally formed with the flat plate, and the interior of the water inlet block 15 has a cavity, through which the aforementioned water inlet pipe 16 communicates.

[0035] The dynamic water mist / powder explosion suppression system also includes: a rotary device 17, which is cylindrical and has its axis along... Figure 1 The direction of the water inlet block 15 is perpendicular to the plane of the paper. It has a water-containing cavity inside. A third annular rubber ring 21 is bonded and fixed to the arc surface of the water inlet block 15. The third rubber ring 21 fits against the circumferential side wall of the rotator, resulting in a small gap between the arc surface of the water inlet block 15 and the circumferential side wall of the rotator 17. A first through hole 19 is provided at the lower end of the water inlet block 15, and the aforementioned third rubber ring 21 is arranged around the first through hole 19. A second through hole 20 is opened on the upper circumferential side wall of the rotator 17. Based on the first through hole 19 and the second through hole 20, the cavity of the water inlet block 15 is connected to the water-containing cavity of the rotator 17. High-pressure water enters the water-containing cavity sequentially through the water inlet pipe, the cavity, the first through hole, and the second through hole. Multiple water mist / powder nozzles 22 are installed at the lower end of the rotator 17. The water entering the water-containing cavity is finally atomized and sprayed out from the water mist / powder nozzles 22.

[0036] The rotator 17 can rotate around its axis, with a maximum rotation angle of 30 degrees. The rotation of the rotator 17 allows for a change in the spray direction of the water mist / powder nozzle 22. Specifically, it also includes the following structures: A bracket 30 is fixedly installed on the water inlet block 15, and a rotating shaft is fixedly installed at the axis of the rotator 17. The rotating shaft is connected to the bracket through a bearing. Thus, the rotator 17 can rotate around its axis relative to the water inlet block 15 within a range of 0-30°. During the rotation, the first through hole 19 and the second through hole 20 always remain completely connected. The second through hole is also within the range enclosed by the third rubber ring. The first through hole 19 and the second through hole 20 are always completely connected to prevent water from leaking from the first through hole 19 into the explosion chamber.

[0037] It also includes a drive structure for rotating the rotator, the drive structure comprising: Part of the gear ring is fixedly installed on the circumferential side wall of the rotator 17. During the design, interference with the second through hole 20 is avoided.

[0038] An explosion-proof motor (including battery) is fixedly mounted on bracket 30. A half-turn gear is fixedly mounted on the shaft of the explosion-proof motor. The gear meshes with the gear ring. Under the control of its internal control program, the explosion-proof motor rotates back and forth, causing the rotator 17 to dynamically rotate back and forth within the range of 0-30°, thereby dynamically changing the spray direction. The explosion-proof motor has its own battery and is electrically connected to the controller via a wireless communication module, and the controller controls its rotation.

[0039] The data acquisition system includes a schlieren acquisition system 24 and a pressure acquisition system 25, both existing technologies, and both connected to a computer 26. The schlieren system comprises a light source, a first focusing lens, a first reflecting mirror, a second reflecting mirror, a second focusing lens, and a high-speed camera, primarily used to capture the microscopic flow field within the explosive container. A high-speed camera and a high-speed infrared camera are also located outside the explosive container, used to record dynamic images of the explosion and the temperature distribution during the explosion process, respectively.

[0040] The pressure acquisition system 25 consists of multiple (three in this embodiment) pressure sensors located outside the explosion vent, used to detect the explosion vent pressure. These sensors are installed within a 0.5-2m range directly in front of the explosion vent, arranged in a gradient pattern, such as 0.5m, 1.0m, and 1.5m. Both the data acquisition system and the pressure acquisition system 25 are controlled by signals from the computer 26, which collects the corresponding data.

[0041] Example 2: An experimental method for dynamic suppression of explosion in a gas-solid two-phase system, comprising the following steps: S1: Equipped with a gas-solid two-phase explosion suppression dynamic suppression experimental system as described in Example 1; S2: The computer sends a gas distribution command to the gas distribution system, which then completes the gas distribution work. S3: The computer sends a movement command to the dynamic ignition system, causing the ignition electrode in the dynamic ignition system to be located at position A inside the explosion container.

[0042] S4: The computer sends an ignition command to the dynamic ignition system, causing an explosion; at the same time as issuing the ignition command, a static explosion suppression command is issued to the dynamic water mist / powder explosion suppression system. The second electric push rod 29 does not extend or retract, and the explosion-proof motor does not start. Only the valve on the water inlet pipe is opened, and the water mist / powder nozzle 22 sprays water mist, but the explosion-proof motor does not start, and the position of the water mist does not change, thus achieving static explosion suppression; the computer collects the micro-flow field data monitored by the schlieren system and the pressure data monitored by the pressure acquisition system; S5: The computer sends a gas distribution instruction to the gas distribution system, and the gas distribution system re-distributes the gas according to the same gas distribution instruction in S2. The gas distribution system then completes the gas distribution work again. S6: The computer sends a movement command to the dynamic ignition system, causing the ignition electrode in the dynamic ignition system to be located at position A inside the explosion container.

[0043] S7: The computer sends an ignition command to the dynamic ignition system, causing an explosion; at the same time as issuing the ignition command, a dynamic explosion suppression command is issued to the dynamic water mist / powder explosion suppression system, the second electric push rod 29 reciprocates, and the explosion-proof motor is activated, causing the rotator to rotate back and forth, and the valve on the water inlet pipe is opened. Compared with S4, only the position and angle of the water mist / powder nozzle 22 changes, while other conditions remain unchanged, thus achieving dynamic explosion suppression; the computer collects the micro-flow field data monitored by the schlieren system and the pressure data monitored by the pressure acquisition system; S8: Compare the data of static and dynamic explosion suppression to explore the differences and benefits between the two methods.

[0044] S9: Repeat S2-S8, change the position of the ignition electrode in the dynamic ignition system, obtain more experimental data, and further explore the influence of the ignition position on the dynamic explosion suppression position and angle.

[0045] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A gas-solid two-phase explosion venting dynamic suppression experimental system, characterized in that, include: Explosion containers, gas distribution systems, dynamic ignition systems, data acquisition systems, dynamic water mist / powder explosion suppression systems, and computers; The dynamic water mist / powder explosion suppression system includes the following components: The water inlet block is movably mounted on the upper inner wall of the explosive container; a second strip-shaped hole is provided on the upper inner wall of the explosive container; the water inlet block can move along the length of the second strip-shaped hole and ensure that the gas inside the explosive container will not be exchanged with the outside through the second strip-shaped hole. The water inlet block includes a flat plate at the top and an arc plate at the bottom. A rotator is rotatably connected to the water inlet block via a bracket. A water inlet pipe is connected to the flat plate, and the upper end of the water inlet pipe extends from the second strip-shaped hole into the explosive container. A cavity is formed in the water inlet block, and a water-containing cavity is formed in the rotator. A third annular rubber ring is fixed on the arc surface of the arc plate, and the third rubber ring contacts the circumferential side wall of the rotator. A first through hole is formed at the lower end of the water inlet block, and a second through hole is formed at the upper end of the rotator. From a top-down view, both the first and second through holes are within the circle enclosed by the third rubber ring. Multiple water mist / powder nozzles are installed at the lower end of the rotator. A high-pressure water source is connected to the upper end of the water inlet pipe. The water inlet pipe, the cavity, the first through hole, the second through hole, the water-containing cavity, and the multiple water mist / powder nozzles are interconnected. A bracket is fixedly mounted on the inlet block, and the rotator can rotate relative to the bracket about its own axis. A drive structure for rotating the rotator is mounted on the bracket; the drive structure includes: An explosion-proof motor is mounted on a bracket, with gears installed on its shaft. A gear ring, fixed to the side wall of the rotator, meshes with a gear and is driven by an explosion-proof motor to rotate as a whole with the gear ring and the rotator. A second connecting rod is fixedly connected to the water inlet block. The upper end of the second connecting rod extends out of the explosion container from the second slot. A second electric push rod is fixedly installed on the outer upper surface of the explosion container. The telescopic end of the second electric push rod is fixedly connected to the second connecting rod. The second electric push rod is used to move the second connecting rod and the water inlet block as a whole along the length direction of the second slot.

2. The gas-solid two-phase explosion venting dynamic suppression experimental system according to claim 1, characterized in that, The dynamic ignition system includes: a second strip-shaped hole formed on the explosive container, the second strip-shaped hole and the first strip-shaped hole being located on two opposite side walls of the explosive container respectively; a sliding plate movably mounted inside the cavity of the explosive container, the sliding plate being able to slide along the length direction of the first strip-shaped hole and ensuring that the gas inside the explosive container does not exchange with the outside through the first strip-shaped hole; a first connecting rod fixedly connected to the sliding plate, the lower end of the first connecting rod extending out of the explosive container from the first strip-shaped hole; a first electric push rod fixedly connected to the lower outer surface of the explosive container, the telescopic end of the first electric push rod being fixedly connected to the first connecting rod; the first electric push rod being used to move the sliding plate and the first connecting rod as a whole along the length direction of the second strip-shaped hole; and an ignition electrode fixedly mounted on the sliding plate, the ignition electrode being connected to a power source outside the explosive container via a wire.

3. The gas-solid two-phase explosion venting dynamic suppression experimental system according to claim 1, characterized in that, The explosion container is equipped with glass windows on its front and rear side walls. The schlieren system in the data acquisition system can observe the microscopic flow field inside the explosion container through the glass windows. The explosion vent is located on the right side of the explosion container, and the pressure acquisition system in the data acquisition system is 0.5-2m away from the explosion vent.

4. A gas-solid two-phase explosion venting dynamic suppression experiment method, based on the gas-solid two-phase explosion venting dynamic suppression experiment system of claim 3, characterized in that, Includes the following steps: S1: Equipped with a gas-solid two-phase explosion suppression dynamic suppression experimental system; S2: The computer sends a gas distribution command to the gas distribution system, which then completes the gas distribution work. S3: The computer sends a movement command to the dynamic ignition system, causing the ignition electrode in the dynamic ignition system to be located at position A inside the explosion container. S4: The computer sends an ignition command to the dynamic ignition system, causing an explosion; at the same time as sending the ignition command, a static explosion suppression command is sent to the dynamic water mist / powder explosion suppression system, the water mist / powder nozzle sprays water mist, the second electric push rod and the explosion-proof motor do not move, realizing static explosion suppression; the computer collects the micro-flow field data monitored by the schlieren system and the pressure data monitored by the pressure acquisition system. S5: The computer sends a gas distribution instruction to the gas distribution system, and the gas distribution system re-distributes the gas according to the same gas distribution instruction in S2. The gas distribution system then completes the gas distribution work again. S6: The computer sends a movement command to the dynamic ignition system, causing the ignition electrode in the dynamic ignition system to be located at position A inside the explosion container. S7: The computer sends an ignition command to the dynamic ignition system, causing an explosion; at the same time as issuing the ignition command, a dynamic explosion suppression command is issued to the dynamic water mist / powder explosion suppression system, the second electric push rod reciprocates, and the explosion-proof motor is activated, causing the rotator to rotate back and forth, and the valve on the water inlet pipe is opened. Compared with S4, where only the position and angle of the water mist / powder nozzle 22 changes, dynamic explosion suppression is achieved; the computer collects the micro-flow field data monitored by the schlieren system and the pressure data monitored by the pressure acquisition system. S8: Compare the static and dynamic explosion suppression data collected in S5 and S7 to explore the differences and benefits of dynamic and static explosion suppression. S9: Repeat S2-S8, change the position of the ignition electrode in the dynamic ignition system, obtain more experimental data, and further explore the influence of the ignition position on the dynamic explosion suppression position and angle.

5. The gas-solid two-phase explosion venting dynamic suppression experimental method according to claim 4, characterized in that, The explosion-proof motor enables the rotator to rotate at a maximum angle of 30°.

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