Evaluation And Numerical Simulation Analysis Of The Smoke And Thermal Environment In The Mine Of Spontaneous Combustion

The fire is one of the magnitude disasters in the mine. It will take serious harm to humans, equipment, resource in the mine, and also effect the ground environment. Spontaneous fire has taken 70% in the total of mine fire. So, the research of mine spontaneous combustion has significant value for the mine safety and social stabilization.Research the rule of smoke flow in the mine fire is the basis of cognizing the law of mine spontaneous fire, building the theory of prediction, doing the technology of prevention and cure research. This paper takes the case of Tongkeng mine which located in Guangxi province for example, summarizes and analyzes the results of the law of fire smoke flow during the process of the fire. Based on the actual fire scene, the model of mathematic and physics about the process mine fire spread were built. Firstly, the fire source have been predigested, and fire smoke flow properties in fire tunnel were simulated and computed by using the Airpak software so as to obtain the distributing condition of velocity field, temperature field and contamination field in the fire tunnel, and the quality of the air in the fire tunnel and stope were evaluated by using the Predicted Mean Vote (PMV) and Predicted Percent Dissatisfied (PPD). Then, fire smoke flow properties and temperature field were simulated and computed by using the Fluent software under unsteady properties so as to obtain the distributing condition of temperature field in the vertical and transect of the fire tunnel under different velocity conditions. At last, based on the thermal environment with high temperature after fire in the mine, this paper made a numerical simulation, and the thermal comfort of environment with different design parameters in the mine were evaluated by predicted mean vote, and make out the best ventilation program.In this paper, experimental and numerical studies are carried out on mine spontaneous combustion process, and reveal the flow, temperature and concentration law of the smoke on space-time as well as the process of how the fire happen and develop. In addition, the thermal comforts of environment with high temperature after fire in the mine were evaluated by predicted mean vote. The results offer the theory basis to determinant the process of how the smoke spread and the dynamic development under actual condition, and provide a technical basis for controlling the fire and preventing the smoke spread, and making the scheme of accident urgent rescue. It also offered the reference value for the fire prevention and cure in the similar spontaneous combustion mine, and bring the lowest influence of the fire.