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《Industry and Mine Automation》 2018-01
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Experimental analysis of isothermal adsorption and desorption characteristics of gas in coal samples with multi grain sizes:A case study on No.3 coal in Sihe Coal Mine

ZHOU Wei;YUAN Liang;XUE Junhua;HE Guanghui;LUO Yong;DUAN Changrui;REN Bo;Ping'an Coal Mining Engineering Technology Research Institute Co.,Ltd.;State Key Laboratory of Deep Coal Mining and Environmental Protection;School of Mining and Safety Engineering,Anhui University of Science and Technology;Shanxi Jincheng Anthracite Coal Mining Group Co.,Ltd.;  
In order to study influence of adsorption pressure and grain size of coal sample on coal gas desorption,the No.3 coal in Sihe Coal Mine was selected as samples,and variety characteristics of gas desorption amount and desorption speed of coal samples with 0.17-0.25,0.25-0.50,1-3 mm grain sizes were analyzed at 1,1.5,3 MPa adsorption pressure by use of a gas isothermal adsorption and desorption experiment system.The experimental results show that under different adsorption pressure conditions,thegas desorption amount of the coal samples and initial desorption speed increase with the increase of adsorption on the whole.However,the influence of adsorption pressure on gas desorption amount and desorption speed of coal samples with 0.25-0.50 mm grain size is smaller than the other two grain sizes.The initial gas desorption amount of coal samples with smaller grain sizes is more than the one of the coal sample with bigger grain size under different adsorption pressure conditions,and the initial desorption speed is faster.But the gas desorption amount of the coal sample with 1.0-3.0 mm grain size is more than the one of the others under 1.5,3 MPa adsorption pressure condition.Therefore,increasing adsorption pressure of coal sample or reducing grain size would cause increase of gas desorption amount and desorption speed.
【Fund】: 国家重点研发计划资助项目(2016YFC0801402 2016YFC0801404);; 国家自然科学基金资助项目(51427804)
【CateGory Index】: TD712
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