煤层注碱治理矿井硫化氢涌出危害研究

Research on control of mine hydrogen sulfide emission by injecting sodium bicarbonate solution into coal seams

为治理煤矿井下硫化氢涌出危害,根据矿井硫化氢动态涌出规律,提出采用煤层注碱治理硫化氢的方法。根据煤炭回采速度和硫化氢涌出浓度,推导注碱参数关系式。以山西某矿E902工作面为典型案例进行现场注碱试验,研究硫化氢涌出规律及煤层注小苏打（Na HCO3）溶液治理硫化氢的效果。监测发现注碱57 h后,注碱孔6 m范围内硫化氢体积分数降低0.001%~0.003%;钻孔注碱时,距工作面26~58 m注入流量较稳定。结果表明：煤层注Na HCO3碱溶液能有效降低硫化氢涌出浓度。

To control the hydrogen sulfide emission of coal mine,a treatment method by injecting sodium bicarbonate solution into coal seams was worked out. According to the coal recovery rate and the concentration of H2 S emission,formulas were derived for the injection operation. On-site experiments were carried out at a certain mine E902 workface in Shanxi province,China. The H2 S emission law and treatment effect were studied during injecting baking soda（ Na HCO3） solution. It was found that within the range of6 meters to the injection hole,the H2 S volume fraction decreased by 0. 001%- 0. 003% after 57 hours injection,and that flow rate was relatively stable in the area 26- 58 meters away from workface when ingecting the solution. The results show that Na HCO3 solution injection into coal seam can effectively reduce the H2 S emission.