露天煤堆自燃过程中“三带”分布的动态特征

Study for Dynamic Distribution Characteristic of Three Areas Under Different Spontaneous Combustion Stage in Open Coal Pile

为了准确划分煤堆自燃过程中的重点监测区域,利用数值模拟方法分析了煤堆自燃带分布的动态变化特征,结果表明:煤堆自迎风面向背风面会形成散热带、自燃带和窒息带,自燃带温度代表了煤堆的自燃危险性.自燃带的位置会随着时间逆风向迎风面移动,以温度和氧气指标划分的自燃带宽度具有不同的变化趋势.依据研究结论,自燃初期宜采用氧气指标,后期采用温度指标划定自燃带区域.

In order to divide the key monitoring area of coal pile during spontaneous combustion process,the numerical method was used to analyze the dynamic change feature of coal pile spontaneous combustion area,the results show that the cooling area,spontaneous combustion area and suffocative area are formed from windward side to lee side,while the temperature in spontaneous combustion area represents the coal pile danger. The position of spontaneous combustion area move towards windward side along with time,and its widths divided by temperature and oxygen indicator have different change trend. Based on research conclusion,oxygen indicator should be taken to determine spontaneous combustion area in initial stage while temperature indicator in later stage.