CN114755266A - An experimental device for simulating gas-coal dust explosion in underground tunnels of coal mines - Google Patents

Abstract

The invention discloses an experimental device for simulating gas-coal dust explosion in a coal mine underground roadway, which comprises a gas dust generation system, an ignition system, a ventilation system, a pipeline system, an injection explosion suppression system and an explosion monitoring system, wherein the pipeline system comprises an explosion pipeline and a plurality of diffusion pipelines which are positioned on the right side of the explosion pipeline and are connected in series through connecting pieces, the gas dust generation system is arranged on the rear side of the explosion pipeline and is connected through a gas injection pipe, the ventilation system is arranged on the left side of the explosion pipeline, an ignition section of the ignition system directly extends into the explosion pipeline, the injection explosion suppression system is arranged on the rear side of the diffusion pipeline, the injection explosion suppression system is connected with each diffusion pipeline through an explosion suppression pipe, and the explosion monitoring system is arranged on the pipeline system. The change of a series of physical sign parameters generated by gas dust explosion can be observed under various conditions, the flame surface propagation rule of the gas dust explosion can be objectively known, and meanwhile, the effective inhibition of gas-coal dust in the underground coal mine can be realized.

Description

An experimental device for simulating gas-coal dust explosion in underground tunnels of coal mines

technical field

The invention belongs to the technical field of coal mine safety engineering, in particular to an experimental device for simulating gas-coal dust explosion in underground tunnels of coal mines.

Background technique

In recent years, domestic and foreign research institutions have carried out a number of experimental studies on gas and coal dust explosions, including: experimental research on the effect of water mist in suppressing gas explosion flame, research on the attenuation law of gas explosion shock wave overpressure at different distances, inert gas Research on the change of explosion overpressure and the law of flame action in the process of gas explosion, as well as the experimental and mechanism research on the inhibition of gas explosion propagation by porous materials. The above researches all use the gas explosion experimental device to carry out the relevant experimental research on the suppression of gas explosion, and have achieved certain staged results, but the relevant research is still immature.

Chinese patent CN105548254A discloses an experimental device and method for simulating gas and coal dust explosion in underground tunnels of coal mines. The patented device also has a simulation defect of gas explosion, which is mainly reflected in the fact that the device as a whole is a closed environment and does not have a ventilation system , the mine airflow simulation cannot be realized. Chinese patent CN208283323U discloses an experimental device for simulating gas and coal dust explosions in underground tunnels of coal mines, but the device can only be used for explosion simulation, without explosion suppression system, and subsequent explosion suppression experiments cannot be carried out. The limitation is that there is no coal dust in the gas explosion environment of the device, so it is impossible to simulate the situation of coal dust explosion or the coupled explosion of gas and coal dust. Diffuse environment, uncontrollable airflow, resulting in uncontrollable coal dust concentration in the pipeline.

SUMMARY OF THE INVENTION

The invention intends to provide an experimental device for simulating gas-coal dust explosion in underground tunnels of coal mines, to observe the changes of a series of physical parameters produced by gas dust explosion under various conditions, to objectively understand the flame surface propagation law of gas dust explosion, and at the same time It can also achieve effective suppression of gas and coal dust in coal mines.

To this end, the technical solution adopted in the present invention is: an experimental device for simulating gas-coal dust explosion in underground tunnels of coal mines, including a gas dust generation system, an ignition system, a ventilation system and a pipeline system, and the pipeline system includes an explosion pipeline and several diffusion pipes located on the right side of the explosion pipe and connected in series through the connecting piece, the gas dust generation system is arranged on the back side of the explosion pipe and connected through the gas injection pipe, and the gas dust generation system is used to simulate different concentrations of gas With the ratio of coal dust, the ventilation system is arranged on the left side of the explosion duct to simulate the air flow in the explosion duct, the ignition section of the ignition system directly extends into the explosion duct, and the rear side of the diffusion duct A jet explosion suppression system is provided for preventing explosions in the diffusion pipes. The jet explosion suppression system and each diffusion pipe are connected through the realization of the explosion suppression pipe. explosion monitoring system for situations;

The explosion pipeline includes an explosion outer tube and an explosion inner tube arranged in the explosion outer tube, the left end of the explosion outer tube is connected with the ventilation system through a first connection flange, and the right end of the explosion outer tube is connected through a second connection flange. Connected to the diffusion pipe, the second connecting flange is provided with a detachable diaphragm, and the detachable diaphragm just closes the right end of the explosion inner pipe, and the left end of the explosion inner pipe is closed and arranged, and the ventilation system simulates The wind flows through the annular channel formed by the explosion outer tube and the explosion inner tube to the diffusion pipe, and the ignition section of the ignition system passes through the explosion outer tube inward and extends into the explosion inner tube

As a preference in the above solution, the gas dust generation system further includes a combustible gas pressure storage tank and an air pressure storage tank arranged on the back side of the explosion pipeline, and the combustible gas pressure storage tank is connected to the explosion dust generator through a combustible gas intake pipe In the device, the explosion dust generator is arranged outside the explosion pipeline, and communicates with the explosion pipeline through the gas injection pipe, the air pressure storage tank is connected to the explosion dust generator through the first air intake pipe, and the combustible gas enters Both the air pipe and the air intake end of the first air intake pipe are provided with flow meters, and a control valve is provided in the middle of the combustible gas intake pipe and the first air intake pipe.

Further preferably, the explosion monitoring system includes at least one group of sensor assemblies consisting of a temperature sensor, a flame sensor and a pressure sensor, and a sensor assembly is provided at the position corresponding to the detonation tube on each diffusion pipe, and the probe of the sensor assembly extends. into the inner wall of the pipe.

Further preferably, the explosion monitoring system also includes a detection component arranged on the explosion pipeline and an automatic alarm component arranged on the leftmost diffusion pipeline, the detection component includes an infrared thermal imager and a high-speed digital camera, and the automatic alarm component Located at the left end of the leftmost detonation pipe, the automatic alarm assembly includes an alarm device arranged on the outer wall of the diffusion pipe, and the alarm device is provided with a sensor assembly with a probe extending into the diffusion pipe.

Further preferably, the jet explosion suppression system also includes at least one explosion suppression gas pressure storage tank and an explosion suppression dust generator connected with each explosion suppression pipe, the explosion suppression dust generator is arranged on the outer wall of the diffusion pipe, and all suppression The gas outlet of the explosion gas pressure storage tank is provided with a gas distribution component, and an explosion suppression air intake pipe is arranged between each gas distribution component and each explosion suppression dust generator, and a flow meter and an explosion suppression air intake pipe are arranged on the explosion suppression air intake pipe. Control valve.

Further preferably, the jet explosion suppression system also includes an explosion suppression dust generator connected with each explosion suppression pipe, the air outlet of the air pressure storage tank is provided with a gas distribution assembly, and the gas distribution assembly is connected with each explosion suppression. The dust generators are connected by an explosion-suppressed air intake pipe, and the explosion-suppressed air intake pipe is provided with a flow meter and a control valve.

Beneficial effects of the present invention:

1) Divide the entire pipeline into an explosion pipeline and a diffusion pipeline, so that the airflow after the explosion breaks through the film and enters and diffuses along the diffusion pipeline. Then, an explosion monitoring system is set in the diffusion pipeline to facilitate the observation of a series of characteristics of the gas dust after the explosion. The change of parameters can objectively understand the flame surface law of gas dust explosion;

2) Separate the explosion pipe and the diffusion pipe, and set up multiple diffusion pipes and connect them by connecting pieces. On the one hand, when a single diffusion pipe is damaged, it does not need to be replaced as a whole, which is convenient for disassembly, assembly and replacement. Simulate straight roadways or curved roadways through different assembly methods, which are flexible and changeable and save experimental costs;

3) The explosion pipeline includes an inner tube for explosion and an outer tube for air to pass through. Coal dust and gas exist in the inner tube, and a simulated air flow channel is formed between the inner and outer tubes. A certain amount of coal dust or low-concentration gas, compared with the existing technology, can more realistically simulate the conditions in the actual coal mine underground tunnel, and at the same time, by controlling the proportion of coal dust and gas entering the explosion inner pipe, it can be realized. Explosion research under gas, coal dust and gas-coal dust coupling state, by controlling the difference of injected gas types and concentrations, it can simulate regional gas and dust explosions;

4) By setting up a ventilation system to simulate the air flow in the explosion pipeline, it is possible to study and analyze the gas and dust explosion characteristics under various air flow conditions; and set the ventilation system on the left side of the explosion pipeline, and the explosion pipeline includes inner and outer pipes, The left end of the inner pipe is closed, which can effectively prevent the explosive air from entering the ventilation system and cause damage to the core component of the ventilation system - the fan, thereby prolonging the service life of the ventilation system;

5) Equipped with a jet explosion suppression system and an explosion monitoring system, the explosion situation is identified through the explosion monitoring system, and the jet explosion suppression system is activated when it is detected that there is an explosion in the diffusion pipe, so as to achieve the effect of suppressing the explosion, and in each diffusion pipe. Explosion suppression pipes are installed on the pipelines. By controlling the first dusting time, dusting duration and dusting position of the explosion-suppression dust generator, the influence on the suppression of flame spread is observed and the dusting time, dusting time, and dusting time to achieve the best explosion-suppression effect are determined. duration and location.

Description of drawings

FIG. 1 is a schematic diagram of Embodiment 1 of the present invention.

Detailed ways

Below by embodiment and in conjunction with accompanying drawing, the present invention is further described:

As shown in Figure 1, an experimental device for simulating a gas-coal dust explosion in a coal mine underground tunnel is mainly composed of a gas dust generation system, an ignition system A, a ventilation system B, a pipeline system, a jet explosion suppression system and an explosion monitoring system. The pipeline system is mainly composed of an explosion pipeline and a number of diffusion pipelines located on the right side of the explosion pipeline and connected in series through connectors. The gas dust generation system is set at the back side of the explosion pipeline, and is connected to the explosion pipeline through the gas injection pipe 1. The system is mainly used to simulate the ratio between gas and coal dust of different concentrations. The ventilation system B is set on the left side of the explosion pipeline and is used to simulate the air flow in the explosion pipeline. The ignition section of the ignition system A extends directly into the explosion pipeline. Inside, the rear side of the diffusion pipe is provided with a jet explosion suppression system for preventing explosions in the diffusion pipe. The jet explosion suppression system and each diffusion pipe are connected through the realization of the explosion suppression pipe 2, and the pipe system is arranged to monitor the explosion situation. or explosion monitoring systems for explosion suppression situations.

The main structure of the explosion pipeline includes the explosion outer tube 3 and the explosion inner tube 4 arranged in the explosion outer tube 3. The left end of the explosion outer tube 3 is connected with the ventilation system B through the first connecting flange 5, and the right end of the explosion outer tube 3 passes through. The second connecting flange 6 is connected with the diffusion pipe, and the second connecting flange 6 is provided with a detachable diaphragm 7, and the detachable diaphragm 7 just closes the right end of the explosion inner pipe 4, and the left end of the explosion inner pipe 4 is closed and arranged , the wind simulated by the ventilation system B flows to the diffusion pipe through the annular channel formed by the explosion outer tube 3 and the explosion inner tube 4. The ignition section of the ignition system A passes through the explosion outer tube 3 and extends into the explosion inner tube 4. The explosion is controlled in the explosion inner tube, which can not only effectively prevent gas leakage, but also facilitate the ventilation system to simulate different diversion conditions on the appearance of the explosion, and realize the simulation of real gas and coal dust explosions. After the explosion, the detachable diaphragm 7 Synchronization is broken, allowing the explosion to spread.

The gas dust generating system also includes a combustible gas pressure storage tank 8 and an air pressure storage tank 9 arranged on the rear side of the explosion pipeline. The gas injection pipe 1 is provided with an explosive dust generator 11 after passing through the explosion outer pipe 3, wherein the combustible gas pressure storage tank 11 is provided. The tank 8 is connected to the explosive dust generator 11 through a combustible gas intake pipe 10 , and the air pressure storage tank 9 is connected to the explosive dust generator 11 through a first air intake pipe 12 . In order to conveniently control the concentration of the combustible gas and the coupling state between the combustible gas and the coal dust, flow meters are provided at the intake ends of the combustible gas intake pipe 10 and the first air intake pipe 12, and at the same time the combustible gas intake pipe 10 and the air intake pipe 12 are provided with flow meters. A control valve 13 is provided in the middle of the first air intake pipe 12 . The number of combustible gas pressure storage tanks 8 can be composed according to the composition of gas in a certain place, and then a combustible gas intake pipe 10 is arranged between each combustible gas pressure storage tank 8 and the explosive dust generator 11, so that it can be simulated according to different places. Composition of combustible gases in coal mines.

The specific structure of the explosion monitoring system includes at least one set of sensor assemblies 14 composed of a temperature sensor, a flame sensor and a pressure sensor, and a sensor assembly 14 is provided at the position corresponding to the detonation suppressor 2 on each diffusion pipe, and the sensor assembly 14 The probe extends into the inner wall of the pipeline, and the entire sensor assembly transmits the temperature, pressure and flame conditions in the pipeline in real time to the monitoring display device through the connector.

The explosion monitoring system also includes a detection component set on the explosion pipeline and an automatic alarm component set on the leftmost diffusion pipeline, wherein the detection component includes an infrared thermal imager and a high-speed digital camera, which can use the infrared thermal imaging technology to cooperate with the high-speed digital camera. The flame image at the moment of burning is obtained, and the flame image is transmitted to the computer through a high-speed digital image acquisition card, and then the flame image is preprocessed and background segmented, so as to realize the detection of gas and coal dust explosion flame. The automatic alarm assembly is located at the left end of the leftmost detonation pipe 2. The automatic alarm assembly includes an alarm device 15 arranged on the outer wall of the diffusion pipe. The alarm device 15 is provided with a sensor assembly 14 whose probe extends into the diffusion pipe. When the probe detects When the temperature or flame is reached, an alarm will be issued, and then the injection explosion suppression system will work to achieve explosion suppression.

The jet explosion suppression system also includes at least one explosion suppression gas pressure storage tank 16 and an explosion suppression dust generator 17 connected to each explosion suppression pipe 2, and the explosion suppression dust generator 17 is arranged on the outer wall of the diffusion pipe. The gas outlet of the gas pressure storage tank 16 is provided with a gas distribution assembly 18, and an explosion suppression air intake pipe 19 is provided between each gas distribution assembly 18 and each explosion suppression dust generator 17. For the convenience of testing, different ratios of suppression are carried out. For the effect of the detonating agent, a flow meter and a control valve 13 are arranged on the detonation suppression intake pipe 19 . The gaseous explosion suppression agent is stored in the explosion suppression gas pressure storage tank 16, and the explosion suppression powder or liquid explosion suppression agent can be stored in the explosion suppression dust generator 17, so that the injection explosion suppression system can carry out the gas-liquid, gas-solid, Gas-liquid-solid three types of phase state explosion suppressant compound group and carry out research on explosion suppression, and each explosion suppression pipe is equipped with a corresponding explosion suppression dust generator and explosion suppression air intake pipe, so that it can be By controlling the first dusting time, dusting duration and dusting position of the explosion-suppression dust generator, the influence on the suppression of flame propagation was observed and the dusting time, duration and position to achieve the best explosion-suppression effect were determined.

In order to facilitate the dispensing of different explosion suppressants, an air pressure storage tank is also set in the jet explosion suppression system or the air pressure storage tank in the gas dust generation system is directly used. When an air pressure storage tank is separately arranged in the jet explosion suppression system, an explosion suppression air intake pipe is arranged between the air pressure storage tank and each explosion suppression dust generator. When the jet explosion suppression system uses the air pressure storage tank in the gas dust generation system, a gas distribution assembly 18 is provided at the air outlet of the air pressure storage tank 9, and the gas distribution assembly 18 passes through each explosion suppression dust generator 17. The explosion suppression intake pipe 19 is connected, and the explosion suppression intake pipe 19 is provided with a flow meter and a control valve 13 .

In this embodiment, the diffusion pipe is composed of three pipes, and two adjacent pipes are connected by a second connecting flange. In order to support the pipeline system conveniently and ensure that the pipeline system does not move, a support seat 21 is arranged under each section of the pipeline, and a pressure gauge 20 for displaying the pressure in the tank is arranged on each pressure storage tank. The ventilation system adopts SAFD-300-1 axial flow fan, and the ignition system adopts pulse ignition device.

The steps to use this device for experiments are as follows:

1. Before the formal experiment, in order to ensure that each part is evenly distributed in the pipeline during powder spraying, and does not touch the lower end of the pipeline during the settling process, first conduct multiple ventilation powder spraying non-ignition experiments, and then confirm the powder spraying pressure and ignition delay. Time;

2. In the explosion experiment, first start the ventilation system, then start the gas dust generation system, and finally start the ignition system to ignite, so that the gas, coal dust and gas-coal dust coupling simulation experiments can be carried out in the explosion pipeline;

3. In the explosion suppression experiment, first start the ventilation system, then start the gas dust generation system, and then start the ignition system to ignite. When the explosion monitoring system senses the explosion information, it will automatically alarm, and the explosion suppression system will automatically spray the explosion suppression agent, so as to prevent the explosion. The explosion flame generated in the explosion pipeline is suppressed.

Claims (6)

1. an experimental device for simulating gas-coal dust explosion in underground tunnel of coal mine, comprising gas dust generation system, ignition system (A), ventilation system (B) and pipeline system, it is characterized in that: described pipeline system comprises explosion pipeline and several diffusion pipes located on the right side of the explosion pipe and arranged in series through the connecting piece, the gas dust generation system is arranged on the rear side of the explosion pipe and is connected through the gas injection pipe (1), and the gas dust generation system is used to simulate different The ratio between the concentration of gas and coal dust, the ventilation system (B) is arranged on the left side of the explosion pipeline to simulate the air flow in the explosion pipeline, and the ignition section of the ignition system (A) directly extends into the explosion In the pipeline, the rear side of the diffusion pipeline is provided with an injection explosion suppression system for preventing explosions in the diffusion pipeline, and the injection explosion suppression system and each diffusion pipeline are connected by a realization explosion suppression pipe (2). An explosion monitoring system for monitoring explosion or explosion suppression is arranged on the pipeline system; The explosion pipeline comprises an explosion outer tube (3) and an explosion inner tube (4) arranged in the explosion outer tube (3), and the left end of the explosion outer tube (3) is connected to the ventilation through the first connection flange (5). The system (B) is connected, and the right end of the explosion outer pipe (3) is connected with the diffusion pipe through a second connection flange (6), and a detachable diaphragm (7) is arranged in the second connection flange (6). , and the detachable diaphragm (7) just closes the right end of the explosion inner tube (4), the left end of the explosion inner tube (4) is closed and arranged, and the wind simulated by the ventilation system (B) flows through the explosion outer tube (3). ) and the explosion inner tube (4) form the annular channel to flow to the diffusion pipe, and the ignition section of the ignition system (A) passes through the explosion outer tube (3) inward and extends into the explosion inner tube (4). 2. The experimental device for simulating gas-coal dust explosion in underground tunnels of coal mines according to claim 1, wherein the gas dust generating system further comprises a combustible gas pressure storage tank (8 ) and an air pressure storage tank (9), the combustible gas pressure storage tank (8) is connected to the explosive dust generator (11) through the combustible gas intake pipe (10), and the explosive dust generator (11) is arranged in the Outside the explosion pipeline, and communicated with the explosion pipeline through the gas injection pipe (1), the air pressure storage tank (9) is connected to the explosion dust generator (11) through the first air intake pipe (12), and the combustible gas Flow meters are provided at the intake ends of the intake pipe (10) and the first air intake pipe (12), and a control valve (13) is provided in the middle of the combustible gas intake pipe (10) and the first air intake pipe (12). ). 3. The experimental device for simulating gas-coal dust explosion in underground tunnels of coal mines according to claim 1, wherein the explosion monitoring system comprises at least one group of sensor assemblies consisting of a temperature sensor, a flame sensor and a pressure sensor (14), a sensor assembly (14) is provided on each diffusion pipe at a position corresponding to the detonation suppression pipe (2), and the probe of the sensor assembly (14) extends into the inner wall of the pipe. 4. The experimental device for simulating gas-coal dust explosion in underground tunnels of coal mines according to claim 3, wherein the explosion monitoring system further comprises a detection assembly arranged on the explosion pipe and a diffusion pipe arranged at the leftmost end The automatic alarm assembly on the upper side, the detection assembly includes an infrared thermal imager and a high-speed digital camera, the automatic alarm assembly is located at the left end of the leftmost detonation suppressor (2), and the automatic alarm assembly includes a device disposed on the outer wall of the diffusion pipe The alarm device (15) is provided with a sensor assembly (14) whose probe extends into the diffusion pipe. 5. The experimental device for simulating gas-coal dust explosion in underground tunnels of coal mines according to claim 1, characterized in that: the jet explosion suppression system further comprises at least one explosion suppression gas pressure storage tank (16) and each Explosion suppression dust generators (17) connected to explosion suppression pipes (2), the explosion suppression dust generators (17) are arranged on the outer wall of the diffusion pipe, and the gas outlets of all explosion suppression gas pressure storage tanks (16) are provided There is a gas distribution assembly (18), and an explosion suppression air intake pipe (19) is provided between each gas distribution assembly (18) and each explosion suppression dust generator (17), and the explosion suppression air intake pipe (19) is provided on the A flow meter and a control valve (13) are provided. 6. The experimental device for simulating gas-coal dust explosion in underground tunnels of coal mines according to claim 2, wherein the jet explosion suppression system also comprises an explosion suppression dust connected with each explosion suppression pipe (2). The generator (17), the air outlet of the air pressure storage tank (9) is provided with a gas distribution assembly (18), and the gas distribution assembly (18) and each explosion suppression dust generator (17) pass through the suppressor. The explosion suppression air pipe (19) is connected, and the explosion suppression air intake pipe (19) is provided with a flow meter and a control valve (13).

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