Numerical Simulation Of Coal Mine Fire Based On FDS

Coal mine fire usually occurs at the place where the airflow is unobstructed anddeveloped rapidly,if it is not controlled timely, not only the coal source and the equipments beburnt out,lead the work face to be closed or shut down， but also result in gas,coal dust,orexplosive,which cause significant fatalities. In this paper,we study the gas flowcharacteristics,temperature field,pressure field,the concentration of poisonous and harmful gasfrom the view of numerical simulation,to provide reference for mine fire rescue andevacuation.The paper studied the tunnel fire by small size model experiments,the temperaturevariation in the use of the temperature sensor during fire period were record,the longitudinalattenuation law of ceiling jet temperature was studied,and setup the same proportion model byFDS software,take N-S equation as the foundation,introducing the turbulence model ofbuoyancy correction,combustion mode,radiation heat transfer mode,established thecalculation model which is suitable for the description of smoke flow regularity,the law oftemperature,the concentration of poisonous and harmful gas distribution,optimized the gridconstruction,by numerical simulation of tunnel fire,obtained the results which were closest tothe experimental results.The simulation model of the horizontal roadway was established,the attenuation law ofCO and temperature were studied,the CO concentration decreases along with the distanceincreases along the roadway,and the decay rate of upwind is faster than the leeward,the decayrate of temperature is larger than CO. In the vertical direction,CO concentration andtemperature decrease from up to down.The situation of fire occurred in the inclined roadwaywas studied,the airflow reversal was simulated,the air pressure and velocity variation abovethe fire were analyzed,the influence factors of air pressure were studied,it increases as the heatrelease rate and inclination angle increases,where the inclination angle affect the air pressure most,and the air velocity have little effect. The physical parameters variation of the blindroadway fire were simulated,including CO concentration，O₂concentration， air pressure andtemperature， the study shows that the CO concentration reach to0.2%near the fire source，the maximum air pressure before fire area sealing is23Pa,the pressure remarkable rise to650Pa after sealing.In the paper numerical simulation of mining face local anti-wind of when the fire periodwas carried out,the temperature field,soot flow,isibility and other parameters were studiedwhen the fire source are in the intake airflow roadway; The parameters such aspressure,temperature,velocity were studied when the whole mine air reversing.