Study On The Time-varying Regularity Of The Smoke Flow And Evaluation On The Smoke Toxicity During Fire In Mine Roadways

The fire in mine roadways is one of major mine disasters, which not only seriously affects the mine's production order, but also endangers the safety of underground miners. High temperature produced by fire affects the health of workers and normal operations of the equipments, while toxic smoke produced by it posts a serious threat to the lives of workers, especially CO in the smoke. Therefore, this paper mainly studies the smoke flow principle of mine fire and evaluates toxicity of CO in the smoke.By analyzing and summarizing the law of smoke occurrence and development, the mathematical model of smoke flow during fire is established, and then the physical model of a fire scene is also built by using GAMBIT software, fire source in the model is a fixed temperature smoke region which is simplified through the VHS model. The boundary conditions and initial parameters of model are set by FLUENT software; the solving of the smoke flow in the roadway is also simulated. By using the simulation results, the temperature, speed, and so on, are calculated in the fire source, the distribution of velocity field, pressure field, temperature field and concentration field of smoke flow in the transportation Lane and the coal face is also described. On this basis, the concentration field of smoke under different wind speed is simulated; smoke concentration in the face is obtained. By using improved FED evaluation model, the toxicity of CO in the face is evaluated, and the evaluation is mainly to determine whether the area is safe through the comparison of the escape time of staff and the disability time of FED model.Through the numerical simulation of smoke movement, the distribution of smoke in the drift and the face is revealed, which provides a reliable basis for mine fire prevention and extinguishing. Meanwhile, CO toxicity evaluation in the face is a valuable reference for developing the rescue and evacuation program during fire.