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《Journal of China Coal Society》 2012-09
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Effect of soluble organic matter in coal on gas sorption and desorption characteristics

PENG Ying-jian,LI Zeng-hua,JI Huai-jun,TANG Yi-bo,LIU Zhen(Faculty of Safety Engineering,China University of Mining & Technology,Xuzhou 221116,China)  
In order to research the effect of soluble organic matter in coal on characteristics of gas sorption and desorption,the organic matters in coal seam 8(Qingdong),coal seam 3(Xutuan) and coal seam 8(Suntuan) of Huaibei mining area were extracted by THF at nomal temperature and pressure.The gas adsorption capacity,vacuum desorption volume at normal pressure and variation of Δp of raw coal and residual coal were comparatively analyzed.After extraction,the Δp and gas adsorption capacity of coal seam 8(Qingdong) and coal seam 3(Xutuan) are reduced.Meanwhile,the increment for gas adsorption capacity of those coal seams increases first and then decreases with the growing of gas pressure.In contrast,the gas adsorption capacity of coal seam 8(Suntuan) has not significant change.However,Δp of coal seam 8(Suntuan) increases.The vacuum desorption volume at normal pressure of all there coal samples is increased.The gas dissolutes in soluble organic matter of coal and forms solid solutions in outburst coal seams,which lead to the increase of coal seam gas content,gas emission speed and coal seams outburst risk.Soluble organic matter occupies part of the pores in non-outburst coal seam,which can slow down the gas release and reduce the gas release rate.
【Fund】: 国家重点基础研究发展计划(973)资助项目(2011CB201200)
【CateGory Index】: TD712.1
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