煤层注碱治理硫化氢数值模拟与应用

发布时间：2018-02-16 14:07

本文关键词： 硫化氢中和反应煤层注碱注碱模拟现场试验　出处：《中国矿业大学学报》2017年02期 　论文类型：期刊论文

【摘要】：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.
[Abstract]:In order to analyze the reaction law of alkali solution with hydrogen sulfide in coal seam, the chemical reaction module of COMSOL Multiphysics software is used to reduce the emission of hydrogen sulfide in coal seam. A numerical experiment was carried out on the treatment of hydrogen sulfide by injecting NaHCO _ 3 into coal bed of Tiexin Coal Mine. It was assumed that the flow of alkali solution in coal fissures meets N-S equation, the flow in coal matrix micropore satisfies Brinkman equation, and the change of reactant meets the convection and diffusion equation. According to the characteristics of occurrence of hydrogen sulfide in coal seam and the parameters of alkali injection, the flow rule of alkali liquid in coal seam and the effect of treating hydrogen sulfide in coal seam are studied. The results show that the content of hydrogen sulfide in coal seam infiltrated by alkali solution can be reduced effectively. The influence range of alkali injection increases gradually with the time of alkali injection. After continuous alkali injection for 18 h, the volume fraction of hydrogen sulfide decreases nearly completely in coal seam less than 51.3% m after continuous alkali injection, and the volume fraction of hydrogen sulfide decreases more than 51.3% m. The alkali injection test of coal seam with 8 m hole spacing was carried out at W910 face. The maximum volume fraction of hydrogen sulfide in return air flow after alkali injection was 5.6 脳 10 ~ (-1) ~ (-6), and there was no excess during mining, which indicated that the simulation results could guide the alkali injection work in coal seam.
【作者单位】：辽宁工程技术大学矿业学院;辽宁工程技术大学力学与工程学院;
【基金】：国家重点基础研究发展计划(973)项目(2011CB201206) 大型油气田及煤层气开发国家重大专项项目(2011ZX05040-2)
【分类号】：TD711

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