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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。
According to the hazard of the emission of hydrogen sulfide from Tiexin Coal Mine, the coalbed methane injection with sodium bicarbonate solution is proposed for treatment. According to the theoretical analysis and field tests, the parameters of alkali injection, including the pressure of alkali injection, the amount of alkali injection, distance. According to seepage theory, the relationship between the influence radius of the caustic injection and the caustic injection pressure was established. It shows that the square of the caustic soda radius is proportional to the caustic injection pressure when the caustic concentration and permeability are constant, The amount of injection is inversely proportional to the amount of sodium bicarbonate; the amount of baking soda required for the complete neutralization of hydrogen sulfide per tonne of coal and the complete neutralization of hydrogen sulphide in the control area for injection of caustic soda are determined according to the conservation of chemical reaction mass. According to the mass fraction of lye, The amount of water injected into the borehole was determined. The field water injection test was carried out. The results show that the advanced working face has a depth of 24-65 m with a high water injection rate. An alkali injection test was conducted in the field. The study shows that the area of ca. 25 ~ 50 m from the working face has a high causticity of 0.2 ~ 0.5 m3 / h in borehole drilling. From the monitoring of the amount of hydrogen sulphide emission, In addition, the faster the reduction of the amount of hydrogen sulfide released from the caustic soda injection, the better the effect of hydrogen sulfide treatment, indicating that the determined caustic soda process parameters are feasible.