煤田火区挥发燃烧机理分析及实验

根据煤田火区挥发燃烧的特点,建立了煤田火区挥发燃烧数学模型和物理模型,用解析方法对数学模型中的控制方程进行求解,得出了在相对静止高温环境中煤层挥发燃烧速度、挥发份组分含量、燃烧火焰温度等参数的解。根据解析的结果,煤田火区挥发燃烧火焰的温度是按挥发份的低热值计算的绝热燃烧温度。在实际的火区中,由于自然对流或强迫对流的作用,真实温度要比绝热燃烧温度低。实验研究发现,在外界加热过程中,不仅发现受热面受到外界的升温影响最大,而内部受到外界影响较小,而且发现在外界温度升高达到一定的程度后,受热面温度会超过外界温度持

Volatilization combustion mechanism analysis and experiment of coalfield fire

According to the volatile combustion, the mathematical and physical models on the volatilization combustion of coal field fire area are established. The governing equations are analyzed by analytic method. The parameters such as volatilization combustion speed, the content of volatile component and the flame temperature are obtained at relatively high temperature environment. According to the solutions, the flame temperature of the volatilization combustion is calculated by the heat insulation temperature in the light of the low-heat value of the volatile component. Due to the free or forced convection in the actual fire area, the true temperature would be lower than the calculation. Through experiment, heating process takes the greatest impact on the heating surface but least on inner parts. The temperature is increased and the heating surface temperature will exceed the temperature and continue increasing, which indicates that the coal begins oxidation. While the airflow is increased, the temperature will be slightly increased. The temperature is descent more slightly in the coal temperature because of thermal radiation.