均压前后采空区自然发火数值模拟研究

Numerical simulation research on spontaneous fire at gob before and after pressure balance

通过理论分析,建立了移动坐标下采空区流场、氧浓度场、气体及冒落煤岩温度场的数学模型,利用有限体积法进行耦合求解,模拟了均压前后采空区自然发火情况。结果表明均压能有效地减少采空区漏风,并能人为形成自燃三带,使得高温区由难以治理的两侧巷帮狭长区域集中到工作面附近,显著降低了采空区自然发火的危险。最后,通过工作面风量测定,验证了均压堵漏的效果。

In order to simulate the condition of spontaneous fire at gob before and after pressure balance,Theoretical analysis helped establish mathematical field model of airflow,oxygen concentration,gas and temperature of caving coal at gob based on moving coordinates,solving coupling equation with finite volume method.The result showed that pressure balance could effectively reduce air leakage at gob and artificially form three spontaneous fire zones,which gathered high temperature area from the long and narrow roadsides to where near working faces,mitigating the potential of spontaneous fire at gob.In addition,the performance of pressure balance was verified by measuring the quantity of airflow through working face.