Comprehensive study on characteristics of coal seams in Qinglongsi Coal Mine
In order to find out the characteristics of the coal seam in the Qinglongsi Coal Mine in the Xinmin mining area of the Jurassic Coalfield in northern Shaanxi,and then provide basic geological data for the washing,processing and utilization of coal resources and the safe,efficient,green and intelligent mining of coal mines,various technical means such as geological drilling,fine description of cores,mac-roscopic/microscopic coal and rock composition analysis,coal geochemical analysis,natural ignition test of coal,gas chromatography analy-sis of ignition landmark gases,specific heat analysis and other technical means were adopted.Based on the test results,the coal rock and coal quality characteristics as well as the spontaneous combustion characteristics of Qinglongsi Coal Mine were comprehensively analyzed.The results show that the cracks of each coal seam in Qinglongsi Coal Mine in Xinmin mining area are not developed,and the solidity coef-ficient of the coal body is 1.5-3.2,which belongs to the medium-hard and hard coal body,and it was proposed to use water injection fracturing to weaken the hard coal rock body and reduce its strength in advance;the coal quality has the characteristics of medium-high moisture,low ash,low and ultra-low sulfur,high calorific capacity of high tar coal,and there is high moisture coal locally;coal seams are all spontaneous combustion-easy to spontaneously combustion coal seams,the natural ignition period is short,the ignition landmark gases are CO,C2H4,C2H6 and C3H8,of which C2H2 is an auxiliary marker,and the shortest natural ignition period of 5-2 coal seams is 36 days.Therefore,in the process of coal mining,while strengthening the sealing of air leakage channels,the gas monitoring of closed goafs,the ven-tilation management of fully-mechanized mining faces,and the control of mining speed should be strengthened,and comprehensive fire pre-vention and extinguishing measures should be strictly implemented.The research results can provide a basis for the clean utilization of coal resources in coal mines,processing and washing,as well as the early warning and daily prevention and control of fires.
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