Study on Hydrogen Sulfide Migration Characteristics in Fully Mechanized Caving Face of Extra-thick Coal Seam
In view of the fact that the single method is used to study the migration law of hydrogen sul-fide concentration in fully mechanized caving face of extra-thick coal seam at the present stage,which can not effectively guide the on-site treatment of hydrogen sulfide,the experimental research is carried out in Pangpangta Coal Mine,Lyuliang,Shanxi Province.The field measuring points are arranged along the verti-cal,horizontal and airflow directions of the working face,and the hydrogen sulfide concentration of the working face is measured by CD4 multi-parameter tester.The geometric model was established by Fluent nu-merical simulation software to analyze the migration law of hydrogen sulfide in the working face.The field measurement results and simulation results show that the hydrogen sulfide concentration along the vertical direction of the roadway increases first and then decreases with the increase of the height of the roadway floor.Along the horizontal direction of the working face,the concentration of hydrogen sulfide gradually de-creases with the increase of the distance from the coal wall.Along the airflow direction of the working face,the concentration of hydrogen sulfide gradually decreases as it gradually moves away from the shearer.
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