Study On Fire Prevention And Control Technique In High Gas Coal Seam

Frequent occurrence of coal mine spontaneous combustion accident in China. And in fire prevention and disaster relief process, often because the overall lack of fire prevention and control technology. Probable causes of the two accidents occurred, resulting in more serious consequences. Often occurs in high gas mine coal mine gas concentration exceeding limits, must be carried out on the gas drainage. However for thick seam mining will result in residual coal in goaf, serious air leakage leads to spontaneous combustion of coal seams. Therefore, high gas coal seam fire preventing and extinguishing technique of significance is particularly important.Firstly, the basic theory analysis on coal spontaneous combustion at home and abroad. Then Fleur gongquan mine field research. 1464 and selected its spontaneous combustion risk for fire prevention and control technology of the face. Theoretical analysis and numerical simulation and field test methods on 1464 goaf field "three zones" Division. On the amount of nitrogen injection for fire prevention, folk songs of theoretical calculations. FLUENT in the numerical simulation of goaf model using mathematical formulas. GOB of fissures of overlying strata and analysis of permeability. According to the simulation results, select shallow injection of 20 m and deep injection of nitric nitrogen 60 m at two locations. And taking into account the amount of nitrogen injection for 300 m3/h, 500 m3/h, 800 m3/h different working conditions, and changes in air temperature and oxygen concentration in the region. Finalized in the form of combined nitrogen injection 500 m3/h of nitrogen injection in goaf and best effect.According to the simulation results of field tests and achieve a good result. Taking into account the complexity of the technology of fire prevention system, according to gongquan mine situation. Other assistive technologies for monitoring and prevention of spontaneous combustion scheme is proposed. For fire prevention and control technique in high gas coal seam provides a valuable scientific basis.