煤层注碱可有效降低矿井硫化氢涌出,为分析碱液在煤层中与硫化氢的反应规律,应用COMSOL Multiphysics软件化学反应模块,对铁新矿煤层注碱(NaHCO3)治理硫化氢进行了数值试验研究.假定碱液在煤裂隙中的流动满足N-S方程,在煤基质微孔中流动满足Brinkman方程,反应物质变化满足对流扩散方程,根据煤层硫化氢赋存特征和注碱参数,研究碱液在煤层中的流动规律以及煤层硫化氢治理效果.结果表明:碱液浸润的煤层区域,硫化氢含量得到有效降低,注碱影响范围随注碱时间逐渐增大.连续注碱18h,距孔7~9 m,硫化氢体积分数降低51.3%以上,7m以内煤层硫化氢几乎完全中和.参考模拟结果,拟采用煤层注碱孔距为8~10m.在W910工作面进行了孔距为8m的煤层注碱试验,注碱后回风流硫化氢体积分数最高为5.6×10~(-6),回采中未超限,表明模拟结果可指导煤层注碱工作. Coal bed caustic soda can effectively reduce the emission of hydrogen sulphide in coal mines. In order to analyze the reaction law of caustic soda with hydrogen sulphide in coal seam, the chemical reaction module of COMSOL Multiphysics software was used to measure the hydrogen sulphide content of alkali caustic soda (NaHCO3) Experimental studies. Assuming that the flow of lye in coal fissures satisfies the NS equation, the Brinkman equation is satisfied for the flow in the coal matrix pores and the change of reactants satisfies the convection-diffusion equation. According to the occurrence characteristics of hydrogen sulfide in coal seam and the parameters of alkali injection, The rule of hydrogen sulfide in the coal seam and the rule of hydrogen sulfide in the coal seam.The results show that the content of hydrogen sulphide in the area of ​​coal seam with alkali lye is effectively reduced and the influence range of the alkali injection increases with the time of caustic soda injection.Under 18h, ~ 9 m, the volume fraction of hydrogen sulfide decreased by 51.3%, and the hydrogen sulfide in coal seam was almost completely neutralized within 7m. According to the simulation results, it is proposed to use coal seam with an alkali injection pitch of 8 ~ 10m. In the coal bed caustic injection test, the maximum volume fraction of hydrogen sulfide in the return air stream after caustic soda injection is 5.6 × 10 -6, and there is no overrun in the recovery. It indicates that the simulation results can guide the caustic soda injection.