Gas-solid two-phase intelligent explosion suppression system for driving powder through high-pressure inert gas and testing method of gas-solid two-phase intelligent explosion suppression system

Abstract

The invention provides a gas-solid two-phase intelligent explosion suppression system for driving powder through high-pressure inert gas and a testing method thereof. The gas-solid two-phase intelligent explosion suppression system is used for simulating gas-dust composite explosion and evaluating the efficiency of an explosion suppressant. The system comprises a model roadway, a gas distribution subsystem, an ignition subsystem, a data acquisition subsystem, an explosion suppression device, a high-speed photography subsystem and a computer. The model roadway is horseshoe-arch-shaped and is sealed by transparent boronized silicon glass, so that the explosion process is convenient to observe. The explosion suppression device is composed of an inert gas storage cabinet and an inhibitor ejector, inert powder is driven to be ejected through high-pressure inert gas, and therefore explosion is effectively suppressed. The data acquisition subsystem acquires explosion parameters through a temperature sensor, a pressure sensor, a flame sensor and a concentration sensor, the high-speed photography subsystem records a flame flow field in real time, and whole-process monitoring and data analysis are achieved in combination with a computer. The system can evaluate the explosion suppression efficiency of the gas-solid two-phase explosion suppressant in a complex explosion environment, and has a wide application prospect.

Description

Technical Field

[0001] The invention belongs to the technical field of gas-solid two-phase explosion suppression, and relates to a gas-solid two-phase intelligent explosion suppression system for powders driven by high-pressure inert gas and a testing method thereof. Background Art

[0002] Against the background of rapid industrial development and in-depth modernization in my country, various explosion accidents caused by flammable gases and flammable dusts have occurred frequently, which has become a major risk factor restricting industrial production safety and sustainable development of the industry, and has posed a huge threat to the life and health of personnel and social and economic stability. Therefore, how to efficiently and intelligently prevent and control gas / dust explosion accidents and minimize their occurrence probability and potential hazards has become a key scientific problem that needs to be solved urgently. Gas-solid two-phase composite explosion suppressant is a new type of explosion suppression technology that has the explosion suppression advantages of inert gas and inert powder. Compared with the traditional single-phase explosion suppression method, the gas-solid two-phase composite explosion suppression technology significantly improves its explosion suppression efficiency and adaptability through the synergistic effect of premixed decomposition, and is recognized as an efficient and economical explosion suppression technology with good application prospects. The suppression effect of the gas-solid two-phase composite explosion suppressant mainly comes from its unique physical and chemical properties and its behavior in the explosion environment. On the one hand, the inert gas and powder explosion suppressant diffuse rapidly and dilute the oxygen concentration in the explosion area, while reducing the explosion pressure and ambient temperature; on the other hand, the inert powder components decompose rapidly when heated and produce small molecules with flame retardant and explosion suppression effects, which participate in the explosion reaction process and snatch free radicals, interrupting the explosion chain reaction process. In addition, the physical barrier and heat absorption properties of the inert gas and powder themselves significantly inhibit the spread of the explosion flame and the propagation of the shock wave, and have a stable explosion suppression effect in different application scenarios. Gas-solid two-phase composite explosion suppressants have been widely used in safety protection in industries such as chemical production, coal mining, food processing and storage.

[0003] The advantage of gas-solid two-phase explosion suppressant is that it has efficient explosion suppression performance through the physical and chemical synergy of inert gas and inert powder, which makes up for the limited suppression effect of single gas or solid phase explosion suppressant itself, as well as the instability of explosion suppression effect under certain specific conditions and relatively single adaptability conditions. The invention patent application with publication number CN117538377A discloses a fast response explosion suppression / explosion suppression synergistic suppression dynamic characteristics test device for combustible medium explosion discharge under the influence of multiple parameters, which integrates multiple systems such as visualization, fire suppression and explosion suppression, realizes synchronous operation through program control and data acquisition system, and comprehensively tests and analyzes the dynamic characteristics and explosion suppression / explosion suppression performance during the explosion discharge of combustible media; the invention patent application with publication number CN117018522A discloses a new type of fire extinguishing agent explosion suppressor driven by gas generating agent, which realizes efficient fire extinguishing and explosion suppression by quickly generating gas through gas generating agent to drive fire extinguishing agent injection; the invention patent application with publication number CN116482325A provides a dust suppression and explosion suppression effect monitoring experimental system for explosion impact dust, which can simulate the dust in coal mine tunnels The dust condition after the explosion impact is carried out through dust reduction in two sections of dust reduction areas, which can realize real-time monitoring of parameters such as dust particle size, concentration and flow rate generated by the explosion; the invention patent application with publication number CN112863610A discloses a three-phase inhibitor compounding method for suppressing the thermal reaction process of gas explosion, determines the type of explosion suppressant according to key explosion suppression reaction information, further prepares solid / liquid two-phase inhibitor, and compounded with gas phase inhibitor into gas / solid / liquid three-phase inhibitor; the invention patent application with publication number CN116007879A provides a gaseous and dust explosion shock wave generation experimental device, which can simulate the confined explosion environment of combustible gas and dust tiny particles, and test the impact overpressure value of gas or dust explosion shock wave acting on personal protective equipment in a closed experimental environment.

[0004] However, the above prior art still has the following deficiencies:

[0005] The test method disclosed in the invention patent with publication number CN117538377A takes into account multi-phase combustible media such as gas, dust, gas / dust and various explosion suppressants, and observes the explosion discharge process by adjusting multiple parameters. However, in actual applications, the parameters and environmental conditions that affect the dynamic characteristics of explosion discharge may be more complex and diverse, and it is impossible to verify its stable explosion suppression effect in a complex explosion environment; the new fire extinguishing agent explosion suppressor based on gas generating agent drive and floating ball magnetic induction sensing technology disclosed in the invention patent with publication number CN117018522A has not been able to effectively verify the flame retardant and explosion suppression efficiency of its spraying fire extinguishing agent; the comprehensive dust suppression and explosion suppression effect disclosed in the invention patent with publication number CN116482325A The monitoring experimental system and method rely more on traditional measurement methods in the quantitative evaluation of specific dust reduction effects, and it is difficult to make an accurate evaluation of the dust suppression and explosion suppression effects in complex scenarios; the compounding method and optimization process of the three-phase inhibitor disclosed in the invention patent with publication number CN112863610A fail to deeply reveal the coupling mechanism of the three-phase inhibitor in the process of suppressing explosion reactions, and how the inhibitors of each phase cooperate to achieve explosion suppression effects; the experimental device provided by the invention patent with publication number CN116007879A only considers the explosion impact of gas or dust in a single direction in a confined space, while the actual explosion environment has an impact in different directions in the three-dimensional space, and cannot simulate the actual situation of the explosion.

[0006] In summary, the existing experimental devices and test platforms are difficult to truly simulate the conditions for gas / dust explosions in actual projects and the impact mechanism of explosion suppressant intervention, and lack a detailed understanding of the explosion propagation process before and after the addition of suppressants. In addition, further research is needed to develop and design the explosion suppressant injection device itself to improve its explosion suppression efficiency. And there are few patent applications that can reasonably and accurately evaluate the explosion suppression efficiency of the selected explosion suppressant. On-site explosion suppression experiments have high safety requirements and have the disadvantages of high cost, large scale, and poor repeatability.

[0007] Therefore, there is an urgent need for an intelligent explosion suppression test system that can truly simulate the gas / dust composite explosion reaction process and the intervention and suppression of gas-solid two-phase explosion suppressants in complex actual engineering scenarios. Summary of the invention

[0008] In view of this, the purpose of the present invention is to solve the above-mentioned problems and provide a gas-solid two-phase intelligent explosion suppression system for powders driven by high-pressure inert gas and a testing method thereof, which are used to study the macroscopic effectiveness and flame characteristics of gas-dust composite explosions before and after the intervention of the selected gas-solid two-phase explosion suppressant.

[0009] In order to achieve the above object, the present invention provides the following technical solutions:

[0010] A gas-solid two-phase intelligent explosion suppression system for powder driven by high-pressure inert gas, comprising a model tunnel, a gas distribution subsystem, an ignition subsystem, a data acquisition subsystem, an explosion suppression device, a high-speed photography subsystem, and a computer;

[0011] The model tunnel is in the shape of a horseshoe arch, is used to simulate an engineering tunnel, and is sealed with transparent borosilicate glass to form a closed space, so as to observe and record the state characteristics of the entire process of gas-dust explosion;

[0012] The gas distribution subsystem injects a combustible gas-air mixture of a preset concentration ratio and amount into the model tunnel through a pipeline to simulate the combustible gas environment in the actual engineering tunnel; the gas distribution subsystem is connected to the explosion suppression device to transport the inert gas to the inert gas storage cabinet;

[0013] An explosion-proof fan is provided at one end of the model tunnel, and an explosion-proof plate is provided in front of the explosion-proof fan. The explosion-proof plate is used to pile up test dust. The test dust is blown away by the explosion-proof fan and forms a combustible dust cloud in the model tunnel.

[0014] The ignition subsystem includes an ignition device disposed in the model tunnel and an explosion-proof power supply disposed outside the model tunnel, which is used to ignite the combustible dust cloud in the model tunnel to achieve a gas-dust explosion;

[0015] The explosion suppression device comprises an inert gas storage cabinet and an inhibitor injector; the inert gas storage cabinet is suspended on the top of the model tunnel, and the inhibitor injectors are evenly distributed around the inert gas storage cabinet and are connected to the inert gas storage cabinet; a powder storage tank is provided in the inhibitor injector for storing inert powder explosion suppressants; when the explosion suppression is started, the inert gas in the inert gas storage cabinet carries the inert powder explosion suppressants in the powder storage tank and sprays them into the model tunnel;

[0016] The data acquisition subsystem includes a plurality of temperature sensors and pressure sensors arranged at the top of the model tunnel, a plurality of flame detectors and gas concentration sensors arranged on the explosion suppression device, a plurality of gas flow meters arranged on the gas distribution subsystem, and a data acquisition instrument; all temperature sensors, pressure sensors, flame detectors, gas concentration sensors and gas flow meters are connected to the data acquisition instrument through explosion-proof wires to collect parameter information of the flame field, temperature field, pressure field and concentration field during the explosion process;

[0017] The high-speed photography subsystem includes a PIV particle image velocimetry system and a high-speed camera; the PIV particle image velocimetry system includes four ultra-high-speed cameras with a field of view covering the model tunnel, a high-frequency pulse laser and a light source, scatters tracer particles in the model tunnel and irradiates with a high-frequency pulse laser and a light source to achieve particle exposure, and uses an ultra-high-speed camera to record the flame flow field information during the explosion in real time; the high-speed camera is used to record the visual dynamic propagation image of the shock wave and flame wave during the entire explosion process;

[0018] The gas distribution subsystem, ignition subsystem, data acquisition subsystem, explosion suppression device and high-speed photography subsystem are all connected to a computer, and are controlled and monitored, stored, analyzed and displayed in real time through the computer.

[0019] Furthermore, a threaded slide rod is fixedly provided at the top of the model tunnel along the length direction, a detachably connected explosion-proof slider is provided on the threaded slide rod, and the explosion suppression device is suspended and connected to the explosion-proof slider.

[0020] Furthermore, a plurality of explosion suppression devices are suspended at intervals along the length direction of the model tunnel.

[0021] Furthermore, the gas distribution subsystem includes a combustible gas cylinder, an air cylinder, an inert gas cylinder, a vacuum pump, and an air outlet pipeline;

[0022] The combustible gas cylinder and the air cylinder are connected to the model tunnel through the first air inlet pipeline, and the combustible gas and air are transported to the simulated tunnel according to the preset concentration and amount;

[0023] The inert gas bottle is connected to the inert gas storage cabinet of the explosion suppression device through a second air inlet pipeline, and the inert gas is delivered to the inert gas storage cabinet according to a preset concentration and amount;

[0024] The vacuum pump is connected to the model tunnel through a pipeline to evacuate the model tunnel; the gas outlet pipeline connects the model tunnel with the outside world to discharge various waste gases generated during the explosion;

[0025] The flammable gas cylinder, air cylinder and inert gas cylinder are all provided with manual valves, and the first air inlet pipeline, the second air inlet pipeline and the air outlet pipeline are all provided with check valves and electromagnetic valves.

[0026] Furthermore, the suppressant injector is connected to the inert gas storage cabinet via a driver, and the suppressant injector is turned under the drive of the driver to realize directional injection of inert gas and inert powder explosion suppressant toward the explosion source or potential diffusion area to form a gas-solid two-phase explosion suppressant cloud.

[0027] Furthermore, the temperature sensors and pressure sensors are evenly spaced at the top of the model tunnel through connecting columns to monitor the temperature and pressure changes at different times and spaces before and after adding the explosion suppressant;

[0028] The gas flow meter is arranged on the connecting pipelines of the combustible gas cylinder, the air cylinder and the inert gas cylinder to monitor and control the flow of the combustible gas, air and inert gas pumped into the model tunnel in real time.

[0029] Furthermore, the flame detector and the gas concentration sensor are arranged on the inert gas storage cabinet of the explosion suppression device. The flame detector accurately detects the ultraviolet radiation generated by the explosion flame through a photosensitive element, and converts the ultraviolet light signal into an electrical signal in real time for synchronous transmission, so as to trigger an alarm response and activate the explosion suppression device to execute a series of preset explosion suppression actions.

[0030] The gas concentration sensor adopts an explosion-proof combustible gas sensor of model UGT-C7, which realizes high-precision real-time measurement of gas concentration in complex environments through semiconductor and infrared detection modules, and converts gas concentration data into electrical signals for synchronous transmission.

[0031] Furthermore, the ultra-high-speed camera adopts a high-sensitivity ultra-high-speed camera of model NEO 25M / C to achieve instantaneous and high-precision measurement of the three-dimensional propagation velocity component information of each point of the explosion shock wave and flame wave in the model tunnel; the ultra-high-speed camera, high-frequency pulse laser, light source and high-speed camera are all installed in explosion-proof casing.

[0032] Furthermore, the ignition device includes an igniter and an ignition fuse; the explosion-proof power supply model is AC220V 16A; the igniter is fixed to the top of the model tunnel through a connecting column and is connected to the explosion-proof power supply through an explosion-proof wire; the ignition fuse uses a nickel-chromium wire with a diameter of 0.2mm, an operating voltage of DC36V, an ignition energy of 10 to 20J, and the ignition action is completed by releasing electric sparks.

[0033] A testing method for the gas-solid two-phase intelligent explosion suppression system based on the above-mentioned high-pressure inert gas driven powder comprises the following steps:

[0034] Step S1: Turn on the corresponding switches of the computer, data acquisition instrument, PIV particle image velocimetry system and high-speed camera, and test whether the equipment is operating normally in turn;

[0035] Step S2: Check whether the air tightness of the model tunnel is good, and pile up a proper amount of dust on the explosion-proof plate at the bottom of the model tunnel;

[0036] Step S3: The model tunnel is evacuated to a vacuum degree of -40 to -30 KPa, and then a combustible gas-air mixture with a preset concentration ratio and amount is injected into the model tunnel to simulate the combustible gas environment in the tunnel in the actual project; during this process, the gas flow meter continuously monitors the combustible gas flow, and when the preset concentration and amount are reached, the computer automatically controls to stop the gas distribution;

[0037] Step S4: Turn on the PIV particle image velocimetry system and the high-speed camera, spread tracer particles in the model tunnel, and use high-frequency pulse laser and light source to irradiate and realize particle exposure, so as to prepare to record the visualized dynamic propagation image of the shock wave and flame wave during the whole explosion process; simultaneously turn on the data acquisition instrument to monitor and collect parameter information of the temperature field, pressure field, flame field, and concentration field in the model tunnel;

[0038] Step S5: Turn on the explosion-proof fan to promote the full mixing and diffusion of combustible gas and dust particles in the model tunnel to simulate the outflow and diffusion of gas and dust in actual engineering;

[0039] Step S6: delivering a certain amount of inert gas into the inert gas storage cabinet through the gas distribution subsystem to prepare for starting explosion suppression;

[0040] Step S7: The operator strictly wears personal protective equipment and evacuates to a safe working area, generates electric sparks through a remotely controlled ignition device, detonates a pre-set gas-dust mixture in the model tunnel, and immediately controls the explosion suppression device to trigger the explosion suppression action after detecting an explosion signal;

[0041] Step S8: After the experiment is over, the waste gas generated by the explosion in the model tunnel is removed in a controlled manner; the data is stored and analyzed to explore the characteristics of the gas-dust composite explosion and evaluate the suppression efficiency of the gas-solid two-phase explosion suppressant in the designed explosion suppression device.

[0042] The beneficial effects of the present invention are:

[0043] 1. The present invention can realistically simulate the explosion process of combustible gas and combustible dust before and after the intervention of gas-solid two-phase explosion suppressant in a closed environment, as well as the propagation of the explosion shock wave and flame wave in the model tunnel. Specifically, a temperature sensor and a pressure sensor are arranged at the top of the model tunnel, and a flame detector and a gas concentration sensor are arranged on the explosion suppression device to monitor and measure in real time the parameter information of the flame field, temperature field, pressure field, and concentration field during the entire process of explosion occurrence and propagation. On this basis, the instantaneous flame flow field information and three-dimensional propagation velocity components of the explosion shock wave and flame wave are intuitively monitored and recorded in combination with non-contact optical measurement technologies such as PIV particle image velocimetry system and high-speed camera, and the propagation image of the explosion shock wave and flame wave in the model tunnel is recorded in real time.

[0044] 2. The present invention efficiently completes explosion suppression actions through a highly integrated intelligent monitoring and control system, conducts high-precision testing and evaluation of the suppression efficiency of the selected gas / solid two-phase explosion suppressant, and more systematically and comprehensively analyzes the macroscopic efficiency and flame propagation characteristics of the gas-dust composite explosion before and after the intervention of the gas-solid two-phase explosion suppressant, ultimately achieving the purpose of ensuring industrial production safety and the safety of people's lives and property.

[0045] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0047] Figure 1 It is an overall schematic diagram of the gas-solid two-phase intelligent explosion suppression system for powders driven by high-pressure inert gas in the present invention.

[0048] Figure 2 It is a structural schematic diagram of the explosion suppression device in the present invention.

[0049] Figure numerals: 1-model tunnel; 1-1-connecting column; 1-2-explosion-proof plate; 1-3-test dust; 1-4-combustible dust cloud; 1-5-threaded slide rod; 1-6-explosion-proof slider; 2-ignition subsystem; 2-1-ignition device; 2-2-explosion-proof power supply; 2-3-igniter; 2-4-ignition fuse; 2-5-first explosion-proof housing; 3-data acquisition subsystem; 3-1-data acquisition instrument; 3-2-second explosion-proof housing; 3-3-first temperature sensor; 3-4-second temperature sensor; 3-5-third temperature sensor; 3-6-first pressure sensor; 3-7 - second pressure sensor; 3-8 - third pressure sensor; 3-9 - first flame detector; 3-10 - second flame detector; 3-11 - third flame detector; 3-12 - first gas concentration sensor; 3-13 - second gas concentration sensor; 3-14 - third gas concentration sensor; 3-15 - first gas flow meter; 3-16 - second gas flow meter; 3-17 - third gas flow meter; 4 - explosion suppression subsystem; 4-1 - inert gas storage cabinet; 4-2 - suppressant ejector; 4-3 - third explosion-proof housing; 4-4 - explosion suppression device; 4-5 - first output air pipe; 4-6-second synchronous controller; 4-7-second air pipe; 4-8-powder storage tank; 4-9-fourth solenoid valve; 4-10-fifth solenoid valve; 4-11-driver; 4-12-explosion suppressant cloud; 5-high-speed photography subsystem; 5-1-PIV particle image velocimetry system; 5-2-high-speed camera; 5-3-first synchronous controller; 5-4-high-frequency pulse laser; 5-5-light source; 5-6-first ultra-high-speed camera; 5-7-second ultra-high-speed camera; 5-8-third ultra-high-speed camera; 5-9-fourth ultra-high-speed camera; 5-10-explosion-proof housing ;5-11-computer;6-gas distribution subsystem;6-1-flammable gas cylinder;6-2-air cylinder;6-3-inert gas cylinder;6-4-first air inlet pipeline;6-5-second air inlet pipeline;6-6-air outlet pipeline;6-7-vacuum pump;6-8-explosion-proof fan;6-9-first manual valve;6-10-second manual valve;6-11-third manual valve;6-12-first check valve;6-13-second check valve;6-14-third check valve;6-15-first solenoid valve;6-16-second solenoid valve;6-17-third solenoid valve. DETAILED DESCRIPTION

[0050] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0051] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0052] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0053] See also Figures 1-2 , which is a gas-solid two-phase intelligent explosion suppression system for powder driven by high-pressure inert gas, including a model tunnel 1, an ignition subsystem 2, a data acquisition subsystem 3, an explosion suppression subsystem 4, a high-speed photography subsystem 5 and a gas distribution subsystem 6, specifically:

[0054] Model tunnel 1 is in the shape of a horseshoe arch and is made of transparent borosilicate glass with a melting point of 1600°C and an explosion-proof pressure of 1.0 MPa, which is convenient for observing and recording the state characteristics of the entire process of gas / dust explosion;

[0055] The ignition subsystem 2 includes an ignition device 2-1 and an explosion-proof power supply 2-2 arranged on the top of the model tunnel 1;

[0056] The data acquisition subsystem 3 includes a number of temperature sensors and pressure sensors arranged on the top of the tunnel, a number of flame detectors and gas concentration sensors arranged on the explosion suppression device, a number of gas flow meters arranged on the air intake pipeline, and a data acquisition instrument 3-1; the sensors are connected to the data acquisition instrument 3-1 and the computer 5-11 through explosion-proof wires, and a second explosion-proof housing 3-2 is installed on the outside; the parameters of the flame field, temperature field, pressure field, and concentration field during the explosion are collected by the sensors, and the data acquisition instrument 3-1 summarizes the information to the computer 5-11 for real-time monitoring, storage, analysis, and display;

[0057] The explosion suppression subsystem 4 includes a cylindrical inert gas storage cabinet 4-1 located in the center and inhibitor injectors 4-2 distributed in an array around the periphery; both the inert gas storage cabinet 4-1 and the inhibitor injectors 4-2 are installed with a third explosion-proof housing 4-3, and the explosion suppression action is completed in the shortest time and in the most effective way through a highly integrated automatic monitoring and control system;

[0058] The high-speed photography subsystem 5 includes a PIV particle image velocimetry system 5-1 and a high-speed camera 5-2, which uses non-contact optical measurement to record the flame flow field information in real time during the explosion process; the high-speed camera 5-2 records the visualized dynamic propagation images of the shock wave and flame wave during the entire explosion process, so as to explore the gas / dust composite explosion characteristics and the suppression efficiency of the gas-solid two-phase explosion suppressant in the designed explosion suppression device 4-4;

[0059] The gas distribution subsystem 6 includes a combustible gas cylinder 6-1, an air cylinder 6-2, an inert gas cylinder 6-3, a first air inlet pipeline 6-4, a second air inlet pipeline 6-5, an air outlet pipeline 6-6, a vacuum pump 6-7 and an explosion-proof fan 6-8; all cylinders are provided with manual valves, including a first manual valve 6-9, a second manual valve 6-10, and a third manual valve 6-11; all pipelines are provided with check valves and electromagnetic valves, including a first check valve 6-12, a second check valve 6-13, a third check valve 6-14, a first electromagnetic valve 6-15, a second electromagnetic valve 6-16, and a third electromagnetic valve 6-17; the electromagnetic valves are connected to the first synchronous controller 5-3 through explosion-proof wires to realize fully automatic valve opening and closing actions; the air outlet pipeline 6-6 connects the model lane with the outside world to promptly discharge various waste gases generated during the explosion; the vacuum pump 6-7 is connected to the model lane to evacuate the model lane.

[0060] Among them, the top and wall of the model tunnel 1 are provided with multiple connecting columns 1-1 with good airtightness, and the bottom is provided with an explosion-proof plate 1-2; an appropriate amount of test dust 1-3 is piled on the explosion-proof plate 1-2; the test dust 1-3 is blown away by the explosion-proof fan 6-8 and forms a combustible dust cloud 1-4 in the model tunnel.

[0061] A number of temperature sensors, a number of pressure sensors and an ignition device 2-1 are installed in the top connecting column 1-1, and a threaded slide rod 1-5, a first gas pipeline 4-5, a first gas inlet pipeline 6-4, a gas outlet pipeline 6-6, a vacuum pump 6-7 and an explosion-proof fan 6-8 are installed in the wall connecting column 1-1; the outer shells of the threaded slide rod 1-5, the first gas pipeline 4-5, the first gas inlet pipeline 6-4, the gas outlet pipeline 6-6 and the explosion-proof fan 6-8 are all made of 1Cr18Ni9Ti stainless steel with an explosion-proof pressure of 1.0MPa; the threaded slide rod 1-5 is fixed to the wall of the model tunnel, and the explosion suppression device 4-4 is suspended above the model tunnel by a detachable explosion-proof slider 1-6; the first gas pipeline 4-5 is also fixed to the wall of the model tunnel, connecting the inert gas cylinder 6-3 with the explosion suppression device 4-4.

[0062] Specifically, the ignition device 2-1 includes an igniter 2-3 and an ignition fuse 2-4; the explosion-proof power supply 2-2 is AC220V16A; the igniter 2-3 is equipped with a first explosion-proof casing 2-5, which is fixed to the top of the model tunnel through a connecting column 1-1, and is connected to the explosion-proof power supply 2-2 and the first synchronous controller 5-3 through an explosion-proof wire. The "ignition" button on the first synchronous controller 5-3 is activated to release the electric spark to complete the ignition action; the ignition fuse 2-4 uses a nickel-chromium wire with a diameter of 0.2mm, an operating voltage of DC36V, and an ignition energy of 10 to 20J.

[0063] Specifically, temperature sensors and pressure sensors are equidistantly distributed at the top of the model tunnel through a connecting column 1-1, including a first temperature sensor 3-3, a second temperature sensor 3-4, a third temperature sensor 3-5, a first pressure sensor 3-6, a second pressure sensor 3-7, and a third pressure sensor 3-8. The suppression efficiency of the selected explosion suppressant is evaluated by monitoring and analyzing the temperature and pressure changes at different times and spaces before and after adding the explosion suppressant.

[0064] The flame detector and the gas concentration sensor are arranged on the cylindrical inert gas storage cabinet 4-1 in the center of the explosion suppression device 4-4, including the first flame detector 3-9, the second flame detector 3-10, the third flame detector 3-11, the first gas concentration sensor 3-12, the second gas concentration sensor 3-13, and the third gas concentration sensor 3-14; the flame detector accurately detects the ultraviolet radiation generated by the explosion flame through the photosensitive element, and converts the ultraviolet light signal into an electrical signal synchronously transmitted in real time, triggering an alarm response and activating the automatic control system of the explosion suppression device to execute a series of preset explosion suppression actions.

[0065] The gas concentration sensor adopts the explosion-proof combustible gas sensor model UGT-C7, which realizes high-precision real-time measurement of gas concentration in complex environments through semiconductor technology and infrared detection modules, and converts the gas concentration data into electrical signals for synchronous transmission, which are transmitted to the second synchronous controller 4-6 and computer 5-11 through explosion-proof wires for integrated control actions.

[0066] Gas flow meters are installed on the air inlet pipelines of the combustible gas cylinder 6-1, the air cylinder 6-2 and the inert gas cylinder 6-3, including a first gas flow meter 3-15, a second gas flow meter 3-16 and a third gas flow meter 3-17, which monitor and control the flow of combustible gas, air and inert gas pumped into the model tunnel in real time.

[0067] Specifically, the inert gas storage cabinet 4-1 and the inhibitor injector 4-2 are both equipped with a third explosion-proof housing 4-3, which completes the explosion suppression action in the shortest time and in the most effective way through a highly integrated automatic monitoring and control system; the inert gas storage cabinet 4-1 is connected to the inert gas cylinder 6-3 through a first gas pipeline 4-5, which is suspended on a threaded slide rod 1-5 fixed on the wall above the model tunnel by a detachable explosion-proof slider 1-6; the inhibitor injector 4-2 is connected to the inert gas storage cabinet 4-1 through a second gas pipeline 4-7. The storage cabinets 4-1 are connected, and a powder storage tank 4-8 ​​is installed inside to store the selected inert powder explosion suppressant; electromagnetic valves are installed on the first gas pipeline 4-5 and the second gas pipeline 4-7, including the fourth electromagnetic valve 4-9 and the fifth electromagnetic valve 4-10; the inert gas storage cabinet 4-1 releases the inert gas after receiving the flame signal, and premixes with the inert powder explosion suppressant in the inhibitor injector 4-2 to form a high-pressure environment, and the inert gas / inert powder gas-solid two-phase explosion suppressant is injected under the drive of the high-pressure inert gas to complete the explosion suppression action.

[0068] A driver 4-11 is installed at the junction of the second gas pipeline 4-7, the inert gas storage cabinet 4-1 and the inhibitor injector 4-2; the driver 4-11 is connected to the second synchronous controller 4-6 and the computer 5-11 through explosion-proof wires, and after receiving the response signals of the flame detector and the gas concentration sensor, it quickly controls the inhibitor injector 4-2 to turn to the explosion source or the potential diffusion area to spray the inert gas / inert powder gas-solid two-phase explosion suppressant to form an explosion suppressant cloud 4-12.

[0069] Specifically, four ultra-high-speed cameras, a high-frequency pulse laser 5-4 and a light source 5-5 are connected to the first synchronous controller 5-3 and the computer 5-11 through explosion-proof wires to achieve instantaneous high-precision measurement of the three-dimensional propagation velocity component information of the explosion shock wave and flame wave at each point in the model tunnel, which is further stored and processed by the computer 5-11.

[0070] The ultra-high-speed camera adopts a high-sensitivity ultra-high-speed camera of model NEO 25M / C, including a first ultra-high-speed camera 5-6, a second ultra-high-speed camera 5-7, a third ultra-high-speed camera 5-8 and a fourth ultra-high-speed camera 5-9; the ultra-high-speed camera, the high-frequency pulse laser 5-4, the light source 5-5 and the high-speed camera 5-2 are all installed with an explosion-proof housing 5-10.

[0071] Specifically, the combustible gas cylinder 6-1, the air cylinder 6-2, and the inert gas cylinder 6-3 are all provided with manual valves, including a first manual valve 6-9, a second manual valve 6-10, and a third manual valve 6-11; the first air inlet pipeline 6-4, the second air inlet pipeline 6-5, and the air outlet pipeline 6-6 are all provided with check valves and solenoid valves, including a first check valve 6-12, a second check valve 6-13, a third check valve 6-14, a first solenoid valve 6-15, a second solenoid valve 6-16, and a third solenoid valve 6-17; the solenoid valves are connected to the first synchronous controller 5-3 through explosion-proof wires to achieve fully automatic valve opening and closing actions; the air outlet pipeline 6-6 connects the model tunnel with the outside world to promptly discharge various exhaust gases generated during the explosion; the vacuum pump 6-7 is connected to the model tunnel to vacuum the explosion cavity.

[0072] The fuel gas cylinder 6-1 and the air cylinder 6-2 are connected to the model tunnel through the first air inlet pipeline 6-4, and the fuel gas and air are pumped into the simulated tunnel according to the preset concentration and quantity; the inert gas cylinder 6-3 is connected to the first gas pipeline 4-5 through the second air inlet pipeline 6-5, and the inert gas such as N2 or CO2 is pumped into the inert gas storage cabinet 4-1 of the explosion suppression device 4-4 according to the preset concentration and quantity.

[0073] A test method for a gas-solid two-phase intelligent explosion suppression system based on a high-pressure inert gas driven powder in this embodiment specifically comprises the following steps:

[0074] Step S1: First, turn on the corresponding switches of the computer 5-11, the data acquisition instrument 3-1, the PIV particle image velocimetry system 5-1 and the high-speed camera 5-2, and test whether the equipment is operating normally in turn;

[0075] Step S2: Close all switches and air inlet and outlet pipes, check whether the air tightness of the model tunnel is good, and pile up a proper amount of dust 1-3 on the explosion-proof plate 1-2 at the bottom of the model tunnel;

[0076] Step S3: Turn on the vacuum pump 6-7, evacuate the model lane to a vacuum degree of -40 to -30 Kpa, turn off the vacuum pump 6-7, open the manual valves of the combustible gas cylinder 6-1, the air cylinder 6-2 and the corresponding electromagnetic valves on the first air inlet pipeline 6-4 in turn, and inject a combustible gas-air mixture with a preset concentration ratio and amount into the model lane to simulate the combustible gas environment in the lane in the actual project. During this process, the gas flow meter continuously monitors the configured combustible gas flow, and immediately sends a warning signal to the data acquisition instrument 3-1 and the computer 5-11 when the preset concentration and amount are reached, and the integrated control electromagnetic valve is automatically closed to stop gas distribution.

[0077] Step S4: Turn on the four ultra-high-speed cameras, high-frequency pulse laser 5-4 and light source 5-5 of the PIV particle image velocimetry system 5-1, spread tracer particles in the model tunnel and irradiate with high-frequency pulse laser 5-4 and light source 5-5 to achieve particle exposure, turn on the high-speed camera 5-2, and record the visual dynamic propagation image of the shock wave and flame wave during the entire explosion process. In addition, the data acquisition instrument 3-1 is turned on synchronously to monitor and collect parameter information of the temperature field, pressure field, flame field and concentration field in the model tunnel.

[0078] Step S5: Turn on the explosion-proof fans 6-8 to promote the full mixing and diffusion of the combustible gas and dust particles in the model tunnel to simulate the outflow and diffusion of gas / dust in actual engineering;

[0079] Step S6: Open the manual valve 6-11 of the inert gas cylinder 6-3, and deliver a certain amount of inert gas to the inert gas storage cabinet 4-1 in the explosion suppression device 4-4 through the second air inlet pipeline 6-5 and the first air delivery pipe 4-5, then close the valve and start the explosion suppression device 4-4;

[0080] Step S7: The operator strictly wears personal protective equipment and evacuates to a safe working area. The remote control device precisely controls the ignition device 2-1 to generate electric sparks, detonating the pre-set gas / dust mixture in the model tunnel. The explosion suppression device 4-4 immediately triggers the explosion suppression action after detecting the explosion signal. The explosion and explosion suppression process is completed by a highly integrated automatic control system to ensure that the explosion suppression action is completed in the shortest time and in the most effective way to protect the safety of personnel and equipment;

[0081] Step S8: After the experiment is over, the vacuum pump 6-7 is started and the gas outlet pipe 6-6 is opened to remove the waste gas generated by the explosion in the model tunnel in a controlled manner. The data acquisition instrument 3-1 and all experimental instruments are turned off in sequence to ensure that the data is completely saved and then transmitted to the computer 5-11 for further processing to explore the gas / dust composite explosion characteristics and evaluate the suppression efficiency of the gas-solid two-phase explosion suppressant in the designed explosion suppression device 4-4.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A gas-solid two-phase intelligent explosion suppression system for powder driven by high-pressure inert gas, characterized in that: It includes model tunnel, gas distribution subsystem, ignition subsystem, data acquisition subsystem, explosion suppression device, high-speed photography subsystem and computer; The model tunnel is in the shape of a horseshoe arch, is used to simulate an engineering tunnel, and is sealed with transparent borosilicate glass to form a closed space, so as to observe and record the state characteristics of the entire process of gas-dust explosion; The gas distribution subsystem injects a combustible gas-air mixture of a preset concentration ratio and amount into the model tunnel through a pipeline to simulate the combustible gas environment in the actual engineering tunnel; the gas distribution subsystem is connected to the explosion suppression device to transport the inert gas to the inert gas storage cabinet; An explosion-proof fan is provided at one end of the model tunnel, and an explosion-proof plate is provided in front of the explosion-proof fan. The explosion-proof plate is used to pile up test dust. The test dust is blown away by the explosion-proof fan and forms a combustible dust cloud in the model tunnel. The ignition subsystem includes an ignition device disposed in the model tunnel and an explosion-proof power supply disposed outside the model tunnel, which is used to ignite the combustible dust cloud in the model tunnel to achieve a gas-dust explosion; The explosion suppression device comprises an inert gas storage cabinet and an inhibitor injector; the inert gas storage cabinet is suspended on the top of the model tunnel, and the inhibitor injectors are evenly distributed around the inert gas storage cabinet and are connected to the inert gas storage cabinet; a powder storage tank is provided in the inhibitor injector for storing an inert powder explosion suppressant; when the explosion suppression is started, the inert gas in the inert gas storage cabinet carries the inert powder explosion suppressant in the powder storage tank and is sprayed into the model tunnel; The data acquisition subsystem includes a plurality of temperature sensors and pressure sensors arranged at the top of the model tunnel, a plurality of flame detectors and gas concentration sensors arranged on the explosion suppression device, a plurality of gas flow meters arranged on the gas distribution subsystem, and a data acquisition instrument; all temperature sensors, pressure sensors, flame detectors, gas concentration sensors and gas flow meters are connected to the data acquisition instrument through explosion-proof wires to collect parameter information of the flame field, temperature field, pressure field and concentration field during the explosion process; The high-speed photography subsystem includes a PIV particle image velocimetry system and a high-speed camera; the PIV particle image velocimetry system includes four ultra-high-speed cameras with a field of view covering the model tunnel, a high-frequency pulse laser and a light source, scatters tracer particles in the model tunnel and irradiates with a high-frequency pulse laser and a light source to achieve particle exposure, and uses an ultra-high-speed camera to record the flame flow field information during the explosion in real time; the high-speed camera is used to record the visual dynamic propagation image of the shock wave and flame wave during the entire explosion process; The gas distribution subsystem, ignition subsystem, data acquisition subsystem, explosion suppression device and high-speed photography subsystem are all connected to a computer, and are controlled and monitored, stored, analyzed and displayed in real time through the computer.

2. The gas-solid two-phase intelligent explosion suppression system for high-pressure inert gas driven powder according to claim 1 is characterized in that: A threaded slide bar is fixedly provided on the top of the model tunnel along the length direction, a detachably connected explosion-proof slide bar is provided on the threaded slide bar, and the explosion suppression device is suspended and connected to the explosion-proof slide bar.

3. The gas-solid two-phase intelligent explosion suppression system for powders driven by high-pressure inert gas according to claim 2 is characterized by: A plurality of explosion suppression devices are suspended at intervals along the length direction of the model tunnel.

4. The gas-solid two-phase intelligent explosion suppression system for powders driven by high-pressure inert gas according to claim 1 is characterized in that: The gas distribution subsystem includes a combustible gas cylinder, an air cylinder, an inert gas cylinder, a vacuum pump, and an air outlet pipeline; The combustible gas cylinder and the air cylinder are connected to the model tunnel through the first air inlet pipeline, and the combustible gas and air are transported to the simulated tunnel according to the preset concentration and amount; The inert gas bottle is connected to the inert gas storage cabinet of the explosion suppression device through a second air inlet pipeline, and the inert gas is delivered to the inert gas storage cabinet according to a preset concentration and amount; The vacuum pump is connected to the model tunnel through a pipeline to evacuate the model tunnel; the gas outlet pipeline connects the model tunnel with the outside world to discharge various waste gases generated during the explosion; The flammable gas cylinder, air cylinder and inert gas cylinder are all provided with manual valves, and the first air inlet pipeline, the second air inlet pipeline and the air outlet pipeline are all provided with check valves and electromagnetic valves.

5. The gas-solid two-phase intelligent explosion suppression system for powders driven by high-pressure inert gas according to claim 1 is characterized in that: The suppressant injector is connected to the inert gas storage cabinet via a driver. The suppressant injector is driven to turn under the driver to realize the directional injection of inert gas and inert powder explosion suppressant toward the explosion source or potential diffusion area to form a gas-solid two-phase explosion suppressant cloud.

6. The gas-solid two-phase intelligent explosion suppression system for powders driven by high-pressure inert gas according to claim 1 is characterized by: The temperature sensors and pressure sensors are evenly spaced at the top of the model tunnel through connecting columns to monitor the temperature and pressure changes at different times and spaces before and after adding explosion suppressants; The gas flow meter is arranged on the connecting pipelines of the combustible gas cylinder, the air cylinder and the inert gas cylinder to monitor and control the flow of the combustible gas, air and inert gas pumped into the model tunnel in real time.

7. The gas-solid two-phase intelligent explosion suppression system for powders driven by high-pressure inert gas according to claim 1 is characterized by: The flame detector and the gas concentration sensor are arranged on the inert gas storage cabinet of the explosion suppression device. The flame detector accurately detects the ultraviolet radiation generated by the explosion flame through a photosensitive element, and converts the ultraviolet light signal into an electrical signal in real time for synchronous transmission, so as to trigger an alarm response and activate the explosion suppression device to execute a series of preset explosion suppression actions; The gas concentration sensor adopts an explosion-proof combustible gas sensor of model UGT-C7, which realizes high-precision real-time measurement of gas concentration in complex environments through semiconductor and infrared detection modules, and converts gas concentration data into electrical signals for synchronous transmission.

8. The gas-solid two-phase intelligent explosion suppression system for powders driven by high-pressure inert gas according to claim 1 is characterized by: The ultra-high-speed camera adopts a high-sensitivity ultra-high-speed camera of model NEO 25M / C, which can realize instantaneous high-precision measurement of the three-dimensional propagation velocity component information of each point of the explosion shock wave and flame wave in the model tunnel; the ultra-high-speed camera, high-frequency pulse laser, light source and high-speed camera are all installed with explosion-proof casing.

9. The gas-solid two-phase intelligent explosion suppression system for powders driven by high-pressure inert gas according to claim 1 is characterized by: The ignition device includes an igniter and an ignition fuse; the explosion-proof power supply model is AC220V 16A; the igniter is fixed to the top of the model tunnel through a connecting column and is connected to the explosion-proof power supply through an explosion-proof wire; the ignition fuse adopts a nickel-chromium wire with a diameter of 0.2mm, an operating voltage of DC36V, an ignition energy of 10-20J, and the ignition action is completed by releasing electric sparks.

10. A test method for a gas-solid two-phase intelligent explosion suppression system for powders driven by high-pressure inert gas according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step S1: Turn on the corresponding switches of the computer, data acquisition instrument, PIV particle image velocimetry system and high-speed camera, and test whether the equipment is operating normally in turn; Step S2: Check whether the air tightness of the model tunnel is good, and pile up a proper amount of dust on the explosion-proof plate at the bottom of the model tunnel; Step S3: The model tunnel is evacuated to a vacuum degree of -40 to -30 KPa, and then a combustible gas-air mixture with a preset concentration ratio and amount is injected into the model tunnel to simulate the combustible gas environment in the tunnel in the actual project; during this process, the gas flow meter continuously monitors the combustible gas flow, and when the preset concentration and amount are reached, the computer automatically controls to stop the gas distribution; Step S4: Turn on the PIV particle image velocimetry system and the high-speed camera, spread tracer particles in the model tunnel, and use high-frequency pulse laser and light source to irradiate and realize particle exposure, so as to prepare to record the visualized dynamic propagation image of the shock wave and flame wave during the whole explosion process; simultaneously turn on the data acquisition instrument to monitor and collect parameter information of the temperature field, pressure field, flame field, and concentration field in the model tunnel; Step S5: Turn on the explosion-proof fan to promote the full mixing and diffusion of combustible gas and dust particles in the model tunnel to simulate the outflow and diffusion of gas and dust in actual engineering; Step S6: delivering a certain amount of inert gas into the inert gas storage cabinet through the gas distribution subsystem to prepare for starting explosion suppression; Step S7: The operator strictly wears personal protective equipment and evacuates to a safe working area, generates electric sparks through a remotely controlled ignition device, detonates a pre-set gas-dust mixture in the model tunnel, and immediately controls the explosion suppression device to trigger the explosion suppression action after detecting an explosion signal; Step S8: After the experiment is over, the waste gas generated by the explosion in the model tunnel is removed in a controlled manner; the data is stored and analyzed to explore the characteristics of the gas-dust composite explosion and evaluate the suppression efficiency of the gas-solid two-phase explosion suppressant in the designed explosion suppression device.

Images