热作用对煤孔隙结构及气体吸附量的影响
Effect of Thermal Action on Pore Structure and Gas Adsorption of Coal
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摘要: 为研究火成岩侵入地点煤层CO异常涌出原因,定量描述岩浆侵入的热作用和时间对煤层孔隙结构和气体吸附量的影响,采用绝氧加热方法对原煤样分别进行不同作用温度和时间的处理,并进行镜质组反射率实验、压汞实验、吸附实验。结果表明:在实验温度与时间条件下,热作用对煤样孔隙结构影响强于时间;热作用增加了煤样微孔数量、总孔容、大孔孔容,煤样孔隙从半封闭型变为全开放型,孔隙间连通性增强;煤样CH4、CO吸附量与热作用温度成正比,热作用改变煤样孔隙结构从而提高了煤样对2种气体的吸附能力。Abstract: To study the cause of abnormal CO emission in coal seams at igneous rock intrusion sites, and quantitatively describe the effects of thermal effects and time of magma intrusion on coal seam pore structure and gas adsorption capacity, the raw coal samples were treated with different temperature and time by anaerobic heating method, and the vitrinite reflectance experiment, mercury intrusion experiment and adsorption experiment were carried out. The results show that under the temperature and time conditions of this experiment, the effect of heat on the pore structure of coal sample is stronger than time; the thermal action increases the number of pores, total pore volume and large pore volume of coal samples, and the pores of coal samples change from semi-closed to fully open, and the connectivity between the voids is enhanced; the adsorption amount of CH4 and CO in coal samples is proportional to the heat application temperature, and the thermal action changes the pore structure of the coal sample to improve the adsorption capacity of the coal sample for the two gases.
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