综放面自燃危险区域及发火期预测理论研究

Coal is rich and the first energy resource in China. But spontaneous fires are often taken place in the coal field outcrops, coal piles and coal mines, which result in a lot of coal lost and air polluted. Self-fires of coal is becoming to one of the main disaster along with the development of the fully mechanized long-wall top-coal caving technology in the 90's. Up to the present, the self-fires of coal are not effectively and purposively controlled, because the problems describing and determining conditions, main factors, time and place of coal spontaneous combustion are not all solved. Therefore, the investigations on the prediction theory have significant theoretical meaning and practical value. Based on therotically studying, the three steps reaction model of coal oxidation is put forward, and the reaction heat can be calculated. The spontaneous combustibility of coal is determined with oxidation and heating tendency together. On the basis of the experiments for simulation of spontaneous combustion in laboratory oven to examine spontaneous combustibility of coal, the various indicators representing spontaneous combustibility of coal is evaluated respectively. The relation of coal size and the spontaneous combustibility and the average physic parameters ,such as oxygen diffusion coefficient，coal heat conduct coefficient, are determined quantificationally. Based on the actual observation and the theory analysis, the new method which the specific air leakage is calculated with the oxygen concentration and the velocity of oxygen consumption by coal is built. According to the theory analysis on the spontaneous ignition process and the main factors, various critical parameters of coal self-ignition, such as the least coal thickness, the least oxygen concentration and the utmost specific air-leakage, are calculated. And the condition determining the zone liable to spontaneous combustion are put forward. According to the theory analysis on the air-leakage and accumulating heat conditions, the mathematics and mechanics model of coal spontaneous combustion is built. And based on the numerical simulating the process of coal self-ignition in the laboratory oven to examine spontaneous combustibility of coal, the results are consistent with the experiment and actual conditions. Based on the application of the prediction theory in the coal mine, the results of the numerical simulation and prediction show good agreements with those actual conditions, which proves that the prediction theory has good prospect in future.

实验研究煤的粒度、空隙率对煤氧化性、放热性及蓄散热条件的影响，煤氧复合过程中的放氧强度、耗氧化速度、一氧化化碳、二氧化碳的产生率与氧气浓度、煤温的关系；煤自燃发火条件及发火期。研究现场漏风规律和漏风强度测算方法。建立综放面采空区和巷道松散煤体自燃发火预测理论，为煤矿自燃火灾预测提供依据，以保障煤矿高产高效工作面的安全生产。.