Looking at the prevention and control of coal mine gas explosion accidents at home and abroad, the common problem is that science and technology are used to ensure safety and insufficient attention and limited capacity. The domestic style of speaking has gone through the game, and even the platoon leader is not the first to actually take the lead. In addition, there is no need for scientific means to self-rescue, no basic knowledge for self-protection, and panic, fear, fear, and panic are the biggest killers of individual life.
Using technology to protect coal mine safety is the fundamental guarantee for eliminating coal mine gas explosion accidents. How to use new technologies and new products to arm coal mines in time to improve coal mine prevention and resistance to gas explosion accidents is the primary choice. How to identify deficiencies from existing technology products and improve them is as important as preventing and controlling coal mine gas explosions.
At present, the gas monitoring and monitoring system used in underground coal mines plays an important role in daily ventilation and gas management, but there are still contradictions between application and actual use management. In practice, coal mine gas explosion accidents cannot be effectively controlled and eliminated.
From coal mine air intake wells to underground diverticulum, to excavation head, to mining face, to return air well, gas monitoring and monitoring system configuration, power failure control, coal mine gas concentration probe and ground control room and the main leading mobile phone Networking of mines, counties, cities, provinces, and national authorities, and even networking with Tianshang Satellite, is undoubtedly the most complete system, the most developed network, the most complete layout, and the most advanced means. However, the gas explosion accident remains the same, and there is no fundamental Get a change.
So what is the reason for our perfect gas monitoring and monitoring system can not really play a foolproof role?
The answer is yes. The reason is first of all the contradiction between the immediacy and the time difference of the gas monitoring and monitoring under the coal mine. And there is a contradiction between time and space difference with the suddenness of gas explosion accidents. At the same time, the probe of the gas monitoring and monitoring system and the source of gas emission from the exposed surface of the underground coal wall and the gas escaping when coal, coal, coal is transported, There is a contradiction between time and space differences; there is also a contradiction between time and space differences in mechanical dynamics, roof movement, caving collision, and firing process to produce a fire-induced ignition-induced gas-sensitive reaction; the above-mentioned three kinds of "time-space difference contradictions" exist. If there is a solution, then no matter what kind of gas monitoring and monitoring is installed, the coal mine gas explosion accident can not be avoided.
Firstly, the contradiction between the immediacy and the time difference of the gas monitoring and monitoring system is studied. When the coal mine gas appears and is reflected on the probe of the monitoring and control system, the original “black and white†on the probe begins to reflect the gas change at the corresponding location. This time takes about 1~5s, and the monitoring and monitoring system simultaneously performs sound and light alarms. Power-off control, this time is completed in about 0.5~4s. The condition of gas explosion during the period of monitoring and monitoring system location can cause gas explosion, because this time has greatly exceeded the induction period causing gas explosion. The gas explosion induction period varies with gas concentration, temperature and oxygen concentration. Therefore, if there is a large amount of gas and open flame, a gas explosion accident is inevitable, so the gas in this section is reduced and reduced in time and space. The contradiction between unevenness and difference is very important, so it is especially important to improve the immediacy of monitoring and monitoring.
In addition, from the coal mine roadway, especially the boring and shooting and mining face cutting coal, breaking coal, falling coal, coal, coal, etc., the gas emission in different production processes is not linear, if encountered Geological structure gas outburst and gas anomaly gushing process is more sudden, and the probe and gas emission parts of the monitoring and monitoring system in coal mine roadway or mining work have spatial space difference, and there is monitoring and monitoring sensitivity. Time and space differences. The movement of high gas concentration to low gas concentration requires the replenishment and dilution of fresh air flow and the diffusion of gas itself. The space between time and time between the monitoring and monitoring system probe and the probe position is very different from the space time between the gas emission points. This difference in space and time is sufficient to form a “rich†and “accumulated†section of gas, and it is easy to meet the over-limits specified in the “Safety Regulations for Coal Mines†and even reach the volume and concentration of gas explosions. Therefore, it is inevitable to encounter an open flame and a gas explosion accident. So how to reduce and reduce this time and space difference is very important.
When the probe of the coal mine monitoring and control system monitors the gas, the power-off device starts to power off and stops the production operation. This process is not instantaneous. There is still a consistency, and it continues until the final stop, especially the process of top coal caving, the process of coal falling from the top, the operation of mechanical equipment from the power outage to the end of the rotation of the motor blades, the process of caving the coal, Laoding The process of pressure and fall... In the process, if a large number of gas swells and open flames occur, it is inevitable. In fact, it has also proved that the mine monitoring and monitoring system is operating normally but a coal mine gas explosion has occurred. Therefore, the coal mine monitoring and control system has a wide range of probe functions, dead angles, wide blind areas and the need to expand energy efficiency.
Through the above research, we can know how to improve the sensitivity of coal mine gas monitoring and monitoring equipment. The forward, immediate, large area, wide range, scanning, probe and probe monitoring range space and time seamlessly overlap, no time and space difference, Thereby, the advance action of the monitoring device is realized, the power is cut off in advance, and the terminal is terminated immediately. Ensuring effective early warning time is critical. Therefore, how to improve the use effect and management level of coal mine gas monitoring and control technology, but not now the system is perfect, the network is developed, the layout is perfect, and the mobile phone can be controlled by the satellite through the satellite, which is now several thousand billion The investment in monitoring and monitoring costs is still consumed in the sound of the coal mine gas explosion. What a deep thought!
So what is the way to effectively control the coal mine gas explosion? As we all know, the coal mine gas explosion only occurs during the abnormal gas emission time during the blasting process, and when the large amount of coal produced in the mining face causes the gas accumulation in the working face, and the extracted area Or the gas drainage process when the closed area is reopened. The prominent points and common points of these three processes are large gas volume, high gas concentration and large time, and long time for gas discharge. These three processes, such as the firing process, the coal cutting process, and the process of sealing the closed wall, may cause gas explosions caused by open flames. A slight accident can cause a major gas explosion. In response to the above process, Yangquan Xinxin Technology Research Institute developed the "Technical Equipment for Preventing and Controlling Gas Explosion in Mining Faces" using compressed air or N2 and F500 and water-soluble synthetic high-pressure aerosol inerting agent in the process of blasting and mining machinery. In the process of discharging gas, the inerting agent is sprayed into the working space of the mining face and the surface of the coal body is adsorbed to form an inert gas mist film to cover the coal gang, coal wall and coal falling and floating coal, cooling and oxygen-insulating fire, reducing Gas concentration, absorption of gunpowder, suppression of fire and dust, reduction of atmospheric oxygen concentration, F500 can reduce the surface tension of water from 72 dynes/cm2 to 33 dynes/cm2, and use molecular polarity to wrap tetrahedral fuel, especially Using its high molecular weight, it absorbs the free radical energy of the gas that is burning and exploding during the collision process, thereby resisting the progress of the chain reaction, and the chemical fire-extinguishing effect of the continuous free radical that interrupts the gas combustion explosion can be within 1 s. The radiation heat of the gas combustion explosion is reduced from 1158 °F to 127 °F, which can reduce the formation of smoke and toxic soot, and can improve the visibility and light transmittance by 68%. Reduces carbon-hydrogenated combustibles by 20% and reduces and reduces the occurrence of explosions and re-explosions. It has truly solved the contradiction between the complicated and variable conditions of coal mining face, the impermanence of gas change and the difficulty of prevention and management, the simultaneous prevention and control, the combination of explosion-proof and explosion-proof, advanced and delayed co-treatment, hidden dangers and disasters, and The Coal Industry Technical Committee was awarded the top ten new technology key promotion projects of the coal industry in 2007.
In the event of a coal mine gas explosion, how to reduce and reduce losses to protect the life of miners is the primary problem, and people have made unremitting efforts on this issue. For example, rescue and disaster relief, narrowing down the disaster area, and installing explosion-proof isolation walls, but still can not reduce accident damage, and sometimes even due to local gas explosion caused by chain explosion of the entire mine, repeated explosions twice and many times, causing the death of the well Bureau.
In the moment when the gas explosion occurs, if you can calm down and look forward to the right, you can immediately climb the lower hand and protect your head and ears. It is basically able to escape at the scene of the explosion, but most people are flustered, afraid, fear, and panic. Forget the basic knowledge, let the positive and negative shock waves kill immediately, the harmful gases generated by the explosion and the oxygen deficiency and explosion after the explosion caused the collapse of the closed wall, the ventilation system was destroyed, and the harmful gases in the closed wall poured into the mining face. Roadway and secondary gas coal dust explosion are the decisive factors causing heavy casualties in coal mines. Therefore, after the coal mine gas explosion, the ventilation system is not destroyed, and the blind wall and the closed wall of the goaf are not damaged, which is an important guarantee for terminating gas explosion accidents and preventing secondary accidents. After decades of blood lessons, Yangquan Xinxin Technology Research Institute Co., Ltd. developed the invention of the closed-wall rapid explosion-proof pressure relief device and quick-closed wall to solve the major problems of the coal mine, improve the mine's ability to resist gas explosion, and realize The permanent closed wall is fast, sturdy, light, airtight, non-collapsed, resistant to flooding, fireproof, explosion-proof. When a gas explosion occurs in the disaster area, it can leak the shock wave to protect the closed wall from damage, and can realize contact, traffic and ventilation. , discharge water, irrigation slurry, injection inert gas mist, gas explosion can prevent a large number of harmful gases in the closed wall, prevent high-temperature fire smoke after the gas explosion, ignite the gas and coal on the other side of the closed wall Dust has the function of terminating the spread of gas explosion smoke and preventing the explosion of gas explosion accidents. At the same time, it can improve the local disaster prevention and resilience of mines and the whole, and realize the intrinsically safe coal mines that use science and technology to ensure coal mine safety and use knowledge to protect the lives of miners. Construction.
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