为进一步研究煤矸石山自燃问题,在温度场、气体浓度场和渗流速度场数学模型的基础上,建立了多场耦合的模拟模型,以大恒煤业煤矸石山为例,对自燃过程中这三个物理场的动态发展规律进行了数值模拟,研究了气体浓度与温度的关系。结果表明,在煤矸石山储热升温过程的初始阶段,总体升温速率较小;随着时间的推移,矸石山内部会逐渐形成高温区,高温区先集中在迎风面附近,然后向背风面扩散;迎风面的氧气始终保持较高的浓度,进入内部后逐渐衰减,总体浓度随堆积时间的延长而降低;一氧化碳浓度的分布规律与氧浓度的分布规律相反;CO2浓度的变化规律与温度变化规律相同,即迎风面附近浓度最高,然后呈现先集中后发散的分布趋势。

To further study the problem of spontaneous combustion in coal gangue mountains, a multi-field coupled simulation model is established based on mathematical models of temperature field, gas concentration field, and seepage velocity field. Taking the coal gangue mountain in Daheng Coal Industry as an example, the dynamic development laws of these three physical fields during the spontaneous combustion process are numerically simulated, and the relationship between gas concentration and temperature is studied. The results indicate that in the initial stage of the thermal storage and heating process in the coal gangue mountain, the overall heating rate is relatively low; As time goes by, a high-temperature area will gradually form inside the gangue mountain, which is first concentrated near the windward side and then spreads to the leeward side; The oxygen concentration on the windward side remains relatively high, gradually decreasing after entering the interior, and the overall concentration decreases with the extension of accumulation time; The distribution law of carbon monoxide concentration is opposite to that of oxygen concentration; The variation law of CO concentration is the same as that of temperature, with the highest concentration near the windward side, followed by a distribution trend of first concentration and then divergence.