Treatment technology of hydrogen sulfide in upper corner of fully mechanized caving face in Wudong Coal Mine

During the mining in fully mechanized caving face of the west wing of No.45 coal seam in Wudong Coal Mine +575 m level, the volume fraction of hydrogen sulfide gas in the upper corner exceeds the limit, which bring serious harm to the mining. By monitoring the volume fraction of hydrogen sulfide, it is concluded that the hydrogen sulfide volume fraction in the upper corner of the same section height direction from the coal wall shows a distribution law that decreases with the increase of the distance from the bottom plate. By using the method of combining theoretical analysis and field test, a new integrated treatment technology of centralized extraction and purification of hydrogen sulfide in the upper corner is proposed. The field application results show that the hydrogen sulfide volume fraction in the position 5 m behind the suction inlet and 1 m behind the outlet decreases from 588.8×10^-6 and 120.2×10^-6 before extraction-purification integration to 28.2×10^-6 and 10.0×10^-6 after extraction-purification, respectively. The extraction rate and purification rate of hydrogen sulfide are 95.2%, 91.7% respectively, and good control effect have been achieved.