大海则煤矿20101工作面采空区自燃“三带”分布规律及注氮参数优化

Distribution of spontaneous combustion"three zones"in the goaf of Dahaize Coal Mine No.20101 working face and optimization of nitrogen injection parameters

以大海则煤矿20101回采工作面为研究对象,通过束管监测采空区内的氧气浓度变化规律,对现场监测所得数据进行分析,划分出采空区自燃“三带”。同时对采空区建立数学模型和物理模型,进行自燃“三带”数值模拟,利用现场测试结果验证了模拟结果的准确性,并根据此模型进行注氮数值模拟,优化注氮参数。结果表明,进风侧距工作面0~16.01 m为散热带,16.01~94.28 m为氧化带,大于94.28 m为窒息带;回风侧距工作面距离0~5.07 m为散热带,5.07~61.82 m为氧化带,大于61.82 m为窒息带。注氮位置30 m处注氮量2880 m^(3)/h对20101综采工作面采空区的惰化效果较好,可满足工作面安全生产需要且更加具有经济效益。

Taking the No.20101 mining face of Dahaize Coal Mine as the research object,the data obtained by monitoring the oxygen concentration in the goaf through beam tubewere analyzed,and the"three zones"of spontaneous combustion in the goaf were divided.At the same time,the mathematical model and physical model were established for the goaf,and the"three zones"numerical simulation of spontaneous combustion was carried out.The accuracy of the simulation results was verified by the field test results,and the nitrogen injection numerical simulation was carried out according to the model to optimize the nitrogen injection parameters.The results show that the distance between the inlet side and the working face from 0 to 16.01 meters is the heat dissipation zone,from 16.01 to 94.28 meters is the oxidation zone,and greater than 94.28 meters is the suffocation zone.The distance between the return air side and the working face from 0 to 5.07 meters is the heat dissipation zone,from 5.07 to 61.82 meters is the oxidation zone,and greater than 61.82 meters is the suffocation zone.The nitrogen injection rate of 2880 m^(3)/h at a position of 30 m has a good inerting effect on the goaf of the No.20101 fully-mechanized mining face,which can meet the safety production needs of the working face and has more economic benefits.