(1.School of Safety Science and Engineering, Liaoning Technical University, Fuxin , China；2.MOE Key Lab of Mine Thermodynamic Disasters and Control, Fuxin , China；3.Xiaonan Mine, Tiefa Coal Industry Group Corporation Limited, Diaobingshan , China

为了比较工作面上行通风与下行通风对采空区自燃危险性的影响,结合晓南矿W2722工作面的具体工程背景,采用煤样封闭耗氧试验,得到晓南矿煤样耗氧速度与环境氧浓度呈线性关系;运用CFD仿真技术模拟采空区流场,得到工作面漏风情况,以及采空区氧浓度场和温度场。当仅考虑瓦斯涌出情况时,下行通风工作面采空区受到瓦斯上浮作用的影响,抑制了工作面向采空区漏风,漏风率为3.68%,反之,上行通风工作面瓦斯上浮加速了工作面漏风率,漏风率为7.35%;模拟加入能量源项的采空区流场,得到下行通风工作面漏风率进一步降低至2.94%,相比上行通风的仿真计算,工作面漏风率高达8.09%。结果表明,高瓦斯易自燃采空区采取上行通风会促进自燃危险的发生,因此在实际生产中,采取下行通风的方法,可以抑制自然发火的危险。

In order to compare the upward and downward ventilations of the coal mining face affected to the spontaneous combustion danger of the goaf, in combination with the certain engineering background of No. W2722 coal mining face in Xiaonan Mine, a closed oxygen consumption experiment of the coal samples was applied to have a linear relationship between the coal sample oxygen consumption speed and the environment oxygen concentration in Xiaonan Mine. With the application of the CFD simulation technology to simulate the flow field in the goaf, an air leakage condition of the coal mining face was obtained and also the oxygen concentration field and the temperature field in the goaf were obtained. When only the gas emission condition was considered, the goaf of the downward ventilation coal mining face would be affected by the upward floating effect of the gas, could restrain the air leakage from the coal mining face to the goaf and the air leakage rate was 3.68%. Conversely the gas upward flotation of the coal mining face with the upward ventilation would accelerate the air leakage of the coal mining face and the air leakage rate would be 7.35%. The simulation on the flow field of the goaf with energy source item could make the air leakage rate of the downward ventilation coal mining face further reduced to 2.94%. In comparison with the simulation calculation of the upward ventilation, the air leakage rate of the coal mining face would be increased to 8.09%. The results showed that with the upward ventilation, the high gassy and easy spontaneous combustion goaf would promote the spontaneous combustion danger occurred. Therefore,in the actual production, the application of the downward ventilation method could restrain the danger of the spontaneous combustion.