中国矿山工程

The 6309 track roadway in Tangkou Mine is adjacent to 6308 goaf, and excessive gas and spontaneous combustion of residual coal in the goaf are highly likely to take place during construction of the track roadway. In order to ensure the operators' safety and prevent spontaneous combustion of residual coal in goaf, the spontaneous combustion risk analysis is carried out and the nitrogen injection technology for fire prevention and control is simulated. The gas in 6308 goaf is displaced by nitrogen injected from high-level boreholes in 6309 track roadway and the goaf temperature is reduced so as to prevent spontaneous combustion of residual coal in the goaf. The results show that the CO concentration, gas concentration and CO₂ concentration in the upper corner decrease by 78%, 76% and 100% respectively after implementing the nitrogen injection technology.