Research on N2 migration law in goaf of large inclined coal seam
Based on the characteristics of the large inclined coal seam in Dong-xia Coal Mine,a similar simulation experiment system was constructed to carry out N2 injection inertization experiments in the goaf of different inclined coal seams.The experimental results showed that in the floor area of the goaf,along the direction of the working face,the N2 migration exhibited a basic L-shaped distribution after transportation,and the distribution range of N2 in the deeper part of the goaf was wider.Within the spatial range,the distribution pattern of N2 migration in the goaf along the strike direction formed an inverted trapezoid shape,with a wider range in higher areas and a narrower range in lower areas.Combined with the actual situation of the 37121-1 working face in Dong-xia Coal Mine,it is concluded that N2 should be injected into the goaf on the lower side of the downstream entry,the actual application effect on-site has a good surface fire prevention and extinguishing effect
large inclined coal seamN2 injection in goafN2 migration lawoptimization of N2 injection
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