综放工作面采空区注氮量与氧化自燃带分布关系

Relationship between oxidized spontaneous combustion zone and nitrogen injection quantity in goaf of fully-mechanized top coal caving mining face

为了防止柳塔煤矿12201综放工作面在推进过程中发生采空区遗煤自燃,采用COMSOL Multiphysics模拟软件研究了不同注氮量条件下采空区氧化自燃带的分布规律。研究结果表明:随着注氮量的增大,氧化自燃带的起始位置沿着工作面方向移动,但整体受注氮量的影响不大,氧化自燃带的终止位置受注氮影响较大,明显向工作面方向移动,导致氧化自燃带的宽度逐渐减小;注氮量与氧化自燃带宽度近似满足幂指数关系,经计算得出最佳注氮量为860 m3/h,此时的氧化自燃带宽度为55 m。

In order to prevent the spontaneous combustion occurred of coal left in the goaf during the face pushing forward of No. 12201fully-mechanized top coal caving mining face in Liuta Mine,COMSOL Multiphysics software was applied to study the distribution law of oxidized spontaneous combustion zone in the goaf under the condition of different nitrogen injection quantity. The study result showed that with the nitrogen injection quantity increased,the initial location of the oxidized spontaneous combustion zone was moved along the direction of the coal mining face,but it was not highly influenced by the nitrogen injection quantity,the terminal location of the oxidized spontaneous combustion was highly influenced by the nitrogen injection and was obviously moved forward to the direction of the coal mining face and thus the width of the oxidized spontaneous combustion zone was steadily reduced. The nitrogen injection quantity and the oxidized spontaneous combustion zone width could approximately meet the relationship of the power exponent. The optimum nitrogen injection quantity calculated was 860 m3/ h and the width of the oxidized spontaneous combustion zone was 55 m.