Study on Opening and Safety Secondary Mining Technology of Low Slice Firing Zone in Hard Roof and Coal Seam
Abstract：In order to ensure a safety opening of the firing zone during mining in the low slice seam with hard roof and coal as well as a safety secondary mining of the coal mining face,according to the firing features of No.307 Block in Meiyukou Mine,the paper discussed the causes of the internal cause firing disaster occurred in the block and analyzed the combustion status of the sealed firing zone.A gas components rate RT quantitative analysis method was applied to study the possibility of recombustion after opening the firing zone.The results showed that the components rate of each sealed gas in the block was all over one which showed the possibility of recombustion after the firing zone opened and the necessary of the measures to prevent and control the recombustion occurred after the firing zone opened.Meanwhile,a balanced pressure and reduced sealing firing zone method with ＂first reduced sealing,second opening＂ was determined at the site and the safety protection measures for the firing zone opening and secondary mining in the low slice seam with hard roof and coal in order to ensure successful opening the firing zone and safety secondary mining under the complicated conditions of a large region.
Keywords：hard roof and coal seamlow sliceopening of firing zonequantitative identification of recombustionRT quantitative analysis method
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 38-41 )