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为防治矿井硫化氢(H_2S)涌出危害,提出采用煤层注碳酸氢钠(Na HCO_3)溶液的方法治理硫化氢。以某矿为例,采集硫化氢涌出煤层煤样,在实验室对其进行可注性和渗透性试验;到现场观测矿井硫化氢涌出特征,在E902和W910工作面实施煤层注碳酸氢钠溶液试验。研究表明:9号煤层为可注性煤层;支承应力区煤层渗透性差;硫化氢涌出量受回采强度影响较大,日割煤刀数越多,硫化氢涌出量越大,停采时涌出量较低;超前工作面25~50 m,煤层注碱流量较高,为0.2~0.5 m3/h;注碱量越大,硫化氢涌出量降幅越大。
In order to prevent the emission of hydrogen sulfide (H2S) in coal mine, a method of controlling the hydrogen sulfide by using sodium bicarbonate (NaHCO3) solution was proposed. Taking a certain mine as an example, coal samples of hydrogen sulfide gushing out from the coal seam were collected and tested for injectability and permeability in the laboratory. The site was observed for the emission characteristics of hydrogen sulphide in the mine. Sewage was injected into the coal seams at E902 and W910, Sodium solution test. The results show that the No.9 coal seam is an injectable coal seam, the permeability of coal seam in the supporting stress zone is poor, and the amount of hydrogen sulfide is greatly affected by the recovery strength. The more the cutting knives are, the greater the amount of hydrogen sulfide is discharged. The emission rate is relatively low; ahead of the working face 25 ~ 50 m, the caustic flow rate in the coal seam is relatively high, which is 0.2 ~ 0.5 m3 / h. The larger the caustic soda amount is, the greater the drop rate of hydrogen sulfide emission is.