Application of Nitrogen Injection Displacement for Fire Extinguishment

According to statistics, the coal spontaneous combustion fire accounted for more than 94% of the total number of coal mine fire, of which 60% occur in gob [1]. With the mining depth increasing, coal pillar become so easy to be crushed that coal spontaneous combustion is easier to occur. The fire’s occurrence and development not only affect the safety in production and the surrounding environment, but also easily lead to explosion of gas or coal dust [2]. Therefore, the research of new technology and new method on the coal spontaneous combustion fire prevention and control are of great significance. Professor Zhang Guoshu presented a new method of nitrogen injection for fire extinguishment in sealed gob. Practice has proved that this method is effective. The article applied this technology in coal mine, and then verified the results through numerical simulation, and then presented some new views in specific implementation of nitrogen injection displacement for fire extinguishment.