Numerical Simulation Of The Mining Area Mountain Fire Smoke Movement Rules And The Influence On The Ventilation System

Mine fires have serious destructive, not only will cause the entire wind temperature increases rapidly in mine ventilation network, but also cause reflux and disorders, and threatened the life safety of the mine personnel. After the fire, if understanding and master the law and the concentration distribution of smoke movement mining area, as well as the impact on the mining area to normal ventilation system, we can rescue fire fighting and provide theoretical guidance, to grasp the law of development of fire, to prevent the spread of mine fire and reduce casualties during fire has important significance.This article adopts the combination of theoretical analysis and numerical experiment methods to study the mining area movement rule of fire smoke. According to fire smoke flow theory, with the aid of numerical experiments, according to the engineering condition of mining roadway, set the relevant parameters and boundary conditions for the establishment of the mining ventilation system model (and fire model); By using numerical simulation software FDS fire smoke flow characteristics and regularity of mining roadway is studied. Study found:①In the inclined mining ventilation roadway, the fire place smoke rising inflation, and spread to leeward of roadway, and the diffusion speed is faster, temperature, wind speed of roadway and the CO2 concentration increases, when arriving at a certain amount of time, the fire to achieve stability, temperature, wind speed and CO2 concentration basic remain unchanged; In oxygen-enriched combustion state, smoke flow of the CO concentration is very low.② Under the two ventilation mode of mountain mining area, fire smoke influence is consistent, fire leeward side completely influenced by the fire, the scope of the fire on roadway below the lateral branch is greater than the upper roadway, while on the drift of pollutants and temperature influence is also stronger than the above fire; Tilted upward ventilation tunnel fire windward side of the area affected by the fire is relatively small impact.③The side branches of the wind side inclined roadway fire area are prone to airflow reversal, which in turn affect the local ventilation system. ④When the ventilation velocity is small, smoke will have the reverse direction of the inlet air flow phenomena, with the wind speed increases, fire smoke would have a certain extent inhibitory effect, countercurrent smoke phenomenon will disappear. These research findings will help people recognize a deeper understanding of the mining area roadway uphill movement of fire smoke, provide a theoretical basis for such fire prevention and control.