The Numerical Simulation Of The Smoke Flow During Fire And The Safety Zone Divide In Mine Roadways

The fire is one of the main mine disasters because of its high perniciousness. The fire will produce toxic and harmful smoke of high temperature, which flows within the long and narrow restricted space underground; it not only damages the underground equipment and affects the normal production, but also pollutes the underground working environment and threats the workers’ health. Therefore, it is significant to study the smoke flow in the roadways.This paper makes numerical simulation of mine fire smoke flow and divides the mine security region. Firstly, establishing the Continuity, Momentum, Energy and Composition Equations of the smoke flow of the mine roadway. Secondly, systematically analyzing the causes of exogenous fire and spontaneous fire. Furthermore, carrying out the numerical simulation of mine fire smoke flow in the case of mechanical ventilation after fire and fire with steady airflow underground respectively, through establishing the similar physical model with software Gambit and making meshing of it and setting relevant parameters with software Fluent, selecting factors of inlet velocity and fire scale. Lastly, proposing division method of security region mine during fire disaster period and listing the instance of security level region division.The numerical results show that in the case of mechanical ventilation after fire and fire with steady airflow underground, the fire smoke and smoke emission reach a certain balance after a long time, the smoke flow of mine tends to be steady; when inlet velocity is small and fire scale is large, toxic and harmful smoke of high temperature will run to the roof and form the shape “mushroom” structure, part of the smoke will flow along roof to the upstream of fire source and pollute the roadway of upstream to a certain extent, thus seriously polluting the roadway of downstream; when airflow increases, the discharge rate of smoke increases, gradually eliminating smoke pollution of upstream, smoke concentration and the airflow temperature of roadway decrease, the effects of smoke discharge become better; when fire scale becomes large, smoke concentration and the airflow temperature of roadway increase, thus pollution of downstream aggravates and the discharge rate of smoke decreases, the effects of smoke discharge weaken.This paper reveals the distribution rules of the smoke flow and temperature, toxic smoke distribution through the numerical simulation of the fire smoke flow in mine roadways, which provides reference for the mine fire prevention and control. Moreover, this paper makes the division of mine security region based on the simulation results, which could offer some reference on fire disaster relief and emergency escape.