Research and application of comprehensive fire prevention and extinguishing technology on ultra long drawback face

106 Coal mine 1702 withdrawal face withdrawal speed is slow, long time, combined goaf air leakage, goaf there are a lot of coal left for a long time, easy to occur spontaneous combustion of coal. In order to solve the problem of coal spontaneous combustion, fire prevention measures should be taken in stages, and the key prevention and control work should be strengthened during the withdrawal period to reduce the difficulty of fire prevention and control during the withdrawal period. By analyzing the hidden danger of spontaneous combustion during the pullback period, comprehensive anti-fire technology research is carried out on the drawback working face for a long period of time with measures such as prediction, dynamic nitrogen injection, grouting, gel injection and pressure injection of anti-fire foam, so as to prevent the spontaneous ignition during the drawback period.