Analysis of 3D flow field in goaf based on CFD and optimization study on nitrogen injection parameters
Nitrogen injection is a commonly used suppression measure when natural fire signs occur in goaf of coal mines.Due to its significant effect,safety and reliability,it is widely used in the practice of extinguishing fires in goaf.The selection of location and amount of nitrogen injection during the nitrogen injection process directly affect the effectiveness and cost of nitrogen injection.A combination of numerical simulation and on-site measurement was used to optimize the nitrogen injection fire prevention and extinguishing parameters.By establishing a simulation physical model based on the experimental working face,the effectiveness of the model was verified through on-site measurement data,and numerical simulation experiments were carried out to study the effects of different nitrogen injection locations and flow rates on the"three zones"of goaf and find the optimal nitrogen injection parameters,the results were verified through on-site application and actual testing,and verify them through measurement.The research results indicated that when the nitrogen injection port was 50 m away from the working face on the inlet side and the nitrogen injection flow rate was 1 000 m3/h,the nitrogen injection effect was good and the cost was the lowest.
CDFfire prevention in goafnitrogen injection locationnitrogen injection amountnumerical simulation
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