Control Mechanism And Technology For Integrated Disaster Of Gas And Coal Spontaneous Combustion In Gob

Along with the increasing mining depth and gas emission, gas disaster is becoming increasingly serious day by day; concurrently, geostress, coal crushing amount and earth temperature increases, coal spontaneous combustion is also increasingly prominent. The integrated disaster has become a common pattern in severe and great casualties of coal mine accidents. Therefore, it will be of great significance to study the control mechanism and technology for integrated disaster of goaf gas and coal spontaneous combustion.For the characteristic of integrated disaster of gob gas and coal spontaneous combustion, there is a consensus that these two kinds of disasters are interact and mutual restrict, so it is important to care about the both when implement through the scene, although it is liable to neglect one or the other. Therefore, it should be according to the characteristics of gob gas and coal spontaneous combustion and control method of various disasters, study the critical factors of coupling effect and confirm the control mechanism and method. Due to the control method of gas and coal spontaneous combustion is methodological, the correlational research is for a certain of living example only, it does not establish an integrated control technique with prediction, forecast and control method for gas and coal spontaneous combustion.This study sets about from the characteristics and control method of these two kinds of disasters, it believes that prevention and control method should be focus on controlling goaf coal spontaneous combustion and the ignition source of gas explosion. However, the key point is gas, the distribution of self ignition zone regarded as the key factor of coupling effect, to study and prevention the interact and mutual restrict of coal spontaneous combustion on the basis of prevention and control gas. About gas, according to mining conditions and gas emission, the air volume, ventilated style and advance speed is determined rationally, and a preferred extracting method is selected for efficient gas control. About coal spontaneous combustion, its specialty is confirmed by experiment, the fire protection method is determined through control oxygen or time on the basis of prevention and control gas, and thus a prediction and forecast-based prevention and control method of integrated disaster is established.For the prediction of integrated disaster, CFD model according to field measurement is developed for prediction study of numerical modeling. From the aspect of ventilation, drainage and fire protection, different air volume, ventilated style and many heavy flow extraction methods, such as the tail drainage, high drainage roadway, surface wells and buried pipe extraction are analyzed, the effect of inerting fire protection for the distribution of self ignition zones is analyzed as well. Thus the minimum advance speed of protecting slef ignition is determined to optimize the ventilation and gas extraction method, so as to perfect the fire protection method.For the forecast of integrated disaster, the index gas and stagnation temperature is taken by experiment as the basis of analysis and judge the degree of coal spontaneous combustion, and the parameters of numerical modeling are amended according to the oxygen concentration distribution through the pipes observation.Based on the prevention and control method of integrated disaster, the inerting fire protection in easily spontaneous coal seam, the working face of high gas emission and drainage, and fire fighting by equal pressure in easily spontaneous coal seam of high gas are practised. The control effect of integrated disaster is validated, and an integrated control technique with prediction, forecast and control method for gas and coal spontaneous combustion is establised.