Study On The Control Technique Of Shigejie Coal Mine Working Face Of Hydrogen Sulfide Gas

Coal resources are the basic energy for the development of various industries,since the industrial revolution,the contribution to the economic development of various countries.However,due to the occurrence of various disasters,casualties and economic losses are very large,which seriously restrict the development of the economy.Due to its low content and narrow distribution range,H₂S has been less studied in coal mine.However,with the increase of the depth of coal mining,coal mine gas hazard H₂S gradually revealed,at the same time as H₂S gas toxicity,when the concentration reaches a certain range of explosion danger,therefore to study migration of H₂S in coal seam and prevention measures.This paper takes Shanxi Lu'an Shigejie Coal Limited liability company 15102 Shigejie Coal Mine as the research object,through the research of H₂S laboratory gas absorbent,the solution can effectively absorb H₂S gas.At the same time,under the influence of coal seam mining,the migration law of coal seam in the coal seam and the influence of the location of different alkali injection holes on the migration rule are studied by numerical simulation.Study on H₂S gas absorbent showed that when the surfactant solution at very low concentration?<0.1 %?,it can be the surface tension of lye is reduced from 72 mN/m to 40 mN/m,the coal absorption rate of 1.5 % and twelve,alkaline sodium in coal sample liquid absorption speed optimal,final 1.5 % to twelve sodium 5 %,NaCO₃ and 2 % XS-2 solutions for complex base material,obtained better effect of gas absorption H₂S.Numerical simulation study shows: when the pressure is stable,within the distance from the working face 10 m,near the location of the bottom plate H₂S coal seam center position is slightly larger than the pressure,with the increase of the distance from the working face position,from the bottom position distance decreases,H₂S gas pressure gradually increased,but H₂S pressure difference is very small,at 150 Pa within.Near the air trough and the vertical position of the center line of the H₂S coal seam gas pressure in coal seam gas is smaller,H₂S maximum value of 4000 Pa.When the distance from the working surface and the air trough is more than 30 m,H₂S gas pressure in coal seam has been stable at about 4000 Pa.In the 50 day range,the H₂S gas pressure decreases rapidly,and then slows down gradually.When the time is more than 200 days,the H₂S gas pressure change in the coal seam tends to be stable.The position of alkali injection hole is not at the same time,influence of H₂S gas pressure in the coal seam is different,when the injection hole position arranged on the roof from the base 0.36 m,symmetrical distribution in the vertical position of the H₂S gas pressure distribution in the coal seam,the overall pressure is small,to take control of H₂S gas injection coal alkali,alkali injection holes should be arranged from the roof level 0.36 M.At the same time,the pressure of the H₂S gas in the central section of the coal seam is in the form of uniform distribution when the distance between the holes is 2 m,and the hole spacing is m.The results of field test can effectively reduce the concentration of H₂S to 30 ppm,which provides a theoretical and experimental basis for H₂S.