原生煤和构造煤对甲烷的吸附扩散特性研究  

Study on gas adsorption and diffusion characteristics of intact coal and tectonic coal

作　　者：曾平 张东明[2] 严先华 宋林 王小蕾 ZENG Ping;ZHANG Dongming;YAN Xianhua;SONG Lin;WANG Xiaoei(Sichuan Furong Chuannan Construction Engineering Co.,Ltd.,Yibin 644000,China;School of Resources and Safety Engineering,Chongqing University,Chongqing 400044,China;Sichuan Dingneng Construction(Group)Engineering Co.,Ltd.,Chengdu 610031,China)

机构地区：[1]四川芙蓉川南建设工程有限公司,四川宜宾644000 [2]重庆大学资源与安全学院,重庆400044 [3]四川鼎能建设(集团)工程有限公司,四川成都610031

出　　处：《矿业安全与环保》2023年第4期36-41,共6页Mining Safety & Environmental Protection

摘　　要：为了研究原生煤和构造煤的吸附扩散特性,采用甲烷吸附装置和解吸装置对2种煤样进行了实验。结果表明,构造煤的极限甲烷吸附量是原生煤的1.18倍,并且在相同甲烷吸附压力下构造煤的吸附能力强于原生煤。当甲烷吸附平衡压力为0.74 MPa和2 MPa时,构造煤的固定扩散系数分别是原生煤的7.3倍和4.5倍,表明构造煤的初始气体扩散能力远高于原生煤。2种煤样的时变扩散系数都随着解吸时间的推移先快速降低后趋于稳定。构造煤的扩散衰减系数在0.74 MPa和2 MPa气体平衡压力下分别达到了96.6%和95.8%,远大于原生煤的扩散衰减系数38.1%和45.7%。In order to study the adsorption-diffusion characteristics of intact coal and tectonic coal,two kinds of coal samples were tested using methane adsorption equipment and desorption equipment.The results show that the maximum methane adsorption capacity of tectonic coal is 1.18 times that of intact coal,and the adsorption capacity of tectonic coal is stronger than that of intact coal under the same methane adsorption pressure.When the equilibrium pressure of methane adsorption is 0.74 MPa and 2 MPa,the constant diffusion coefficient of tectonic coal is 7.3 times and 4.5 times that of intact coal,respectively,indicating that the initial gas diffusion capacity of tectonic coal is much higher than that of intact coal.The time-dependent diffusion coefficients of the two coal samples first decreases rapidly and then tends to be stable with the desorption time.The diffusion attenuation coefficient of tectonic coal reaches 96.6% and 95.8% at the gas equilibrium pressure of 0.74 MPa and 2 MPa respectively.They are much higher than the diffusion coefficients 38.1% and 45.7% of intact coal.

关 键 词：原生煤 构造煤 甲烷吸附 固定扩散系数 时变扩散系数 

分 类 号：TD712[矿业工程—矿井通风与安全]