煤层注碱治理硫化氢工艺参数研究

发布时间：2018-02-28 01:42

本文关键词： 矿井硫化氢碳酸氢钠煤层注碱涌出规律工艺参数　出处：《煤矿安全》2017年11期 　论文类型：期刊论文

【摘要】：针对铁新煤矿硫化氢涌出危害,提出采用煤层注碳酸氢钠溶液进行治理,根据理论分析和现场试验确定了煤层注碱工艺参数,包括注碱压力、注碱量、注水量和超前注碱距离。根据渗流理论建立了注碱影响半径与钻孔注碱压力之间的关系表达式,表明碱液浓度和煤层渗透率一定时,注碱影响半径的平方与注碱压力成正比关系,与碱液注入量成反比关系;根据化学反应物质的量守恒定律,确定了吨煤硫化氢完全中和及注碱钻孔控制范围硫化氢完全中和所需的小苏打用量;根据碱液质量分数,研究确定了钻孔注水量;进行了现场注水试验,研究表明:超前工作面24~65 m,钻孔注水量较高。进行了现场注碱试验,研究表明距工作面25~50 m区域,煤层钻孔注碱量较高,达0.2~0.5 m3/h,由硫化氢涌出量监测可知,钻孔注碱量越多,回采注碱煤层硫化氢涌出量降低越快,硫化氢治理效果越好,表明确定的注碱工艺参数可行。
[Abstract]:In view of the harm of hydrogen sulfide emission in Tiexin coal mine, this paper puts forward the method of injecting sodium bicarbonate solution into coal seam for treatment. According to the theoretical analysis and field test, the technological parameters of alkali injection in coal seam, including the injection pressure and the quantity of alkali injection, are determined. Based on the seepage theory, the relationship between the influence radius of alkali injection and the pressure of drilling water injection is established, which indicates that the alkali concentration and permeability of coal seam are constant. The square of the influence radius of alkali injection is proportional to the injection pressure and inversely proportional to the amount of alkali injection. The amount of baking soda needed for complete neutralization of hydrogen sulfide in tons of coal and the control range for drilling with alkali injection are determined. According to the mass fraction of alkali solution, the quantity of water injected into the borehole is determined, and the field water injection test is carried out. The study shows that the water injection capacity of the drilling hole is higher than that of the lead working face, and the field alkali injection test is carried out. The results show that the alkali injection quantity in the coal seam is higher, up to 0.20.5m3 / h, in the area of 2550 m from the working face. The monitoring of hydrogen sulfide emission shows that the more the alkali injection quantity in the borehole is, the more the alkali injection quantity in the borehole is. The faster the reduction of hydrogen sulfide emission from coal seam with alkali injection, the better the treatment effect of hydrogen sulfide, which indicates that the determined technological parameters of alkali injection are feasible.
【作者单位】：山西保利铁新煤业有限公司;
【分类号】：TD711

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