Study On Air Flow Control Technology During Mine Fire

Fire is one of five major disasters in coal mine. It has many special characters such as breaking out suddenly, fire developing quickly, putting out fire and rescuing hardly. Under the influence of fire power, air is easily to be disturbed, even the air in the whole ventilation system. Poisonous gases produced by fire will spread and pollute production areas. It is a great threat to safety and health of mine workers. Through the airflow control system is established, automatic air doors are used to realize airflow remote controlling. When breaking out of fire, smoke is exhaust by special return roadway. It is effectively limited smoke influence area and the loss. It provides escaping guidance to personnel. It has great practical significance to reduce the staff casualty rate.Based on CFD technology, this thesis stimulates ventilation flow field, temperature field and pollutants distribution field during fire. By simplifying enough without impact on the fire simulation, Gambit is used to establish physical models of No.2 and No.5 belt roadway in Kongzhuang Coal Mine. By using RNG k-εturbulence model, P1 radiation model, energy equation, and Mixture Multiphase flow model in Fluent, the concentration of CO and smoke, temperature and air flow speed in the length wise direction and CO distribution in the cross section of different distances away from ignition sources are obtained. The results provide basis for sensors arrangement position in the tunnel. Through non-steady simulation, CO diffusion mathematical model is established.Based on the numerical simulation, the ventilation automatic control system during fire in the belt roadway of Kongzhuang Coal Mine is established. Automatic door and sensors are introduced. By underground escape experiments, personnel escape velocity model in pathway of Kongzhuang Coal Mine is established. Combined with CO diffusion models, the installation site of rescue capsules is studied. Finally, the install location and quantity details of air doors, sensors and alarms in No.2 and No.5 belt roadway are introduced.