December 07, 2021

What are the measures to isolate coal dust explosions?

After the local site underground explosion or combustion occurs, the deposition of coal dust explosion were raised and spread rapidly. In order to break and control the explosion that has already occurred and prevent it from continuing to expand, it is necessary to adopt explosion-proof measures to limit the explosion to a small extent and avoid large-scale vicious accidents. There are two types of commonly used explosion-proof measures:

(1) Passive explosion-proof shed. It consists of a passive rock shed, a passive sink shed and a passive water shed. Its function is to blow off or crush the explosion-proof shed when the local coal dust or gas explosion occurs, due to the shock wave propagating ahead of the explosion flame, so that the anti-explosive agent (rock powder or water) on the scaffold or in the trough Flying away, creating a high concentration of rock dust or water mist belt in the roadway, even if mixed with the raised coal dust that is raised there, can prevent the spread of the subsequent explosion flame and the deposition of coal dust. . The passive explosion-proof shed requires sensitive and reliable action under the action of explosion shock wave. The quantity of installed rock powder or water is determined by the roadway section and the explosion strength and should meet the requirements of the Coal Mine Safety Regulations.

(2) Automatic explosion-proof device. It uses the sensor to quickly receive and recognize the sudden changes in flame, pressure and temperature that occur in an explosion, and then converts it into a signal to give the control host a signal to measure the flame speed; the control host has a computer function. After receiving the signal, the flame speed is measured by the speedometer, and the time for the explosion source flame to reach the sprinkler position is determined according to a pre-programmed procedure, and according to this time, the sprayer is issued a command to spray the anti-explosive agent, and finally the sprinkler A certain concentration of anti-explosive agent is sprayed at the predetermined spraying location to extinguish the flame that has just arrived. The domestic automatic explosion-proof device uses infrared optical sensor to detect and identify the explosion combustion flame, which can eliminate the influence of non-explosive light source; the device can extinguish the explosion flame partition within 15-50 meters from the explosion source.

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