Optimization Design and Technological Improvement of Nitrogen Injection Technology for Fire Prevention in Goaf
In order to reduce the risk of spontaneous combustion of residual coal and improve the effect of nitrogen injection on fire prevention.The distribution of oxygen concentration in goaf under different nitrogen injection positions and nitrogen injection amounts was simulated and determined that the optimal nitrogen injection amount was 1400 m3/h and the nitrogen injection position was 40 m away from the working face.The process of nitrogen injection is changed from interval type to non-interval type.At the same time,the measures such as hanging windscreen and building baffle wall are used to prevent the outflow of nitrogen.After the improvement,the CO concentration in the gob increases first and then decreases,and the CO concentration in the inlet and return air is less than the maximum CO concentration of 0.024‰,which indicates that the nitrogen injection process can inhibit the spontaneous combustion and oxidation of coal in the gob.
nitrogen injection for fire preventionnitrogen injection amountsnitrogen injection positions
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