Study On Fire Evolution Law Of Coal Seam Outcrop In Taileweiqiuke Of Xinjiang

In order to solve the problems of outcrop of coal seam spontaneous combustion fire caused by a large number of coal burning in taileweiqiuke of Xinjiang,atmospheric environment contaminated and the threatened underground coal mine production safety,we need scientifically grasp the evolution regularity of outcrop of coal seam spontaneous combustion fire in taileweiqiuke of Xinjiang.The spontaneous combustion characteristics of A5a+b coal seam outcrop of taileweiqiuke in Xinjiang are studied by using thermogravimetric and spontaneous combustion index gases determination experience.Based on the fire site features and coal geological data,nearest to smoke into the air leakage in the fire area and channel,the length of the shortest,flue gas flow system of one of the most open air leakage fire area physical model is established as the background.Use of porous media seepage theory,the three conservation equation and heat and mass transfer theory,build a mathematical model of evolution of coal seam outcrop fire.By using fluent software numerical simulation simulate the fire wind pressure under the action of the velocity vector field and the temperature field when ventilating pressure by fire,when there are ventilating pressure by fire and external wind pressure,air leakage intensity ensured,different air leakage intensity and ensure air leakage intensity,different air leakage intensity,the temperature field under different feature point temperature,oxygen concentration field,leakage wind flow field and pressure field are simulated.The results show that when ventilating pressure by fire lead to the maximum speed of 0.729 m/s wind flow,ventilating pressure by fire is 170.2 Pa,when there are ventilating pressure by fire and external wind pressure,the main reason leads to the occurrence of coal seam outcrop fire are the existence of large crack and sustained air leakage for oxygen.Accroding to the results of numerical simulation,put forward comprehensive fire-prevention measures of stripping,drilling,water injection,grouting and loess covering.Through the burning temperature measuring point statistics,monitoring index gases before and after the fire area governance show that the comprehensive extinguishing method achieved the extinguishing effect.